Show hint if navigation section is unavailable #751

Currently translated at 100.0% (589 of 589 strings)

Translated using Weblate (Russian)

Currently translated at 100.0% (589 of 589 strings)

Co-authored-by: Koitharu <nvasya95@gmail.com>
Translate-URL: https://hosted.weblate.org/projects/kotatsu/strings/ru/
Translate-URL: https://hosted.weblate.org/projects/kotatsu/strings/uk/
Translation: Kotatsu/Strings

.github/FUNDING.yml

@@ -1,2 +0,0 @@
-ko_fi: xtimms
-custom: ["https://yoomoney.ru/to/410012543938752"]

.gitignore

@@ -10,11 +10,13 @@
 /.idea/compiler.xml
 /.idea/workspace.xml
 /.idea/navEditor.xml
+/.idea/ktlint-plugin.xml
 /.idea/assetWizardSettings.xml
 /.idea/kotlinScripting.xml
 /.idea/kotlinc.xml
 /.idea/deploymentTargetDropDown.xml
 /.idea/androidTestResultsUserPreferences.xml
+/.idea/deploymentTargetSelector.xml
 /.idea/render.experimental.xml
 /.idea/inspectionProfiles/
 .DS_Store

CONTRIBUTING.md

@@ -1,11 +1,12 @@
 ## Kotatsu contribution guidelines
 
-- If you want to fix bug or implement a new feature, that already mention in the [issues](https://github.com/KotatsuApp/Kotatsu/issues), please, assign this issue to you and/or comment about it.
++ If you want to **fix bugs** or **implement new features** that **already have an [issue card](https://github.com/KotatsuApp/Kotatsu/issues):** please assign this issue to you and/or comment about it.
-- Whether you have to implement new feature, please, open an issue or discussion regarding it to ensure it will be accepted.
++ If you want to **implement a new feature:** open an issue or discussion regarding it to ensure it will be accepted.
-- Translations have to be managed using the [Weblate](https://hosted.weblate.org/engage/kotatsu/) platform.
++ **Translations** have to be managed using the [Weblate](https://hosted.weblate.org/engage/kotatsu/) platform.
-- In case you want to add a new manga source, refer to the [parsers repository](https://github.com/KotatsuApp/kotatsu-parsers).
++ In case you want to **add a new manga source,** refer to the [parsers repository](https://github.com/KotatsuApp/kotatsu-parsers).
 
-Refactoring or some dev-faces improvements are also might be accepted, however please stick to the following principles:
+**Refactoring** or some **dev-faces improvements** might also be accepted. However, please stick to the following principles:
-- Performance matters. In the case of choosing between source code beauty and performance, performance should be a priority. 
+
-- Please, do not modify readme and other information files (except for typos).
++ **Performance matters.** In the case of choosing between source code beauty and performance, performance should be a priority. 
-- Avoid adding new dependencies unless required. APK size is important.
++ Please, **do not modify readme and other information files** (except for typos).
++ **Avoid adding new dependencies** unless required. APK size is important.

README.md

@@ -19,7 +19,7 @@ Kotatsu is a free and open source manga reader for Android.
 * Tablet-optimized Material You UI
 * Standard and Webtoon-optimized reader
 * Notifications about new chapters with updates feed
-* Integration with manga tracking services: Shikimori, AniList, MyAnimeList
+* Integration with manga tracking services: Shikimori, AniList, MyAnimeList, Kitsu
 * Password/fingerprint protect access to the app
 * History and favourites [synchronization](https://github.com/KotatsuApp/kotatsu-syncserver) across devices
 

app/build.gradle

@@ -16,13 +16,13 @@ android {
 		applicationId 'org.koitharu.kotatsu'
 		minSdk = 21
 		targetSdk = 34
-		versionCode = 600
+		versionCode = 622
-		versionName = '6.4'
+		versionName = '6.7'
 		generatedDensities = []
-		testInstrumentationRunner "org.koitharu.kotatsu.HiltTestRunner"
+		testInstrumentationRunner 'org.koitharu.kotatsu.HiltTestRunner'
 		ksp {
-//			arg("room.generateKotlin", "true") TODO: enable later
+			arg('room.generateKotlin', 'true')
-			arg("room.schemaLocation", "$projectDir/schemas")
+			arg('room.schemaLocation', "$projectDir/schemas")
 		}
 		androidResources {
 			generateLocaleConfig true
@@ -82,33 +82,32 @@ afterEvaluate {
 }
 dependencies {
 	//noinspection GradleDependency
-	implementation('com.github.KotatsuApp:kotatsu-parsers:46e863ef79') {
+	implementation('com.github.KotatsuApp:kotatsu-parsers:014ea5ef49') {
 		exclude group: 'org.json', module: 'json'
 	}
 
 	coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:2.0.4'
-	implementation 'org.jetbrains.kotlin:kotlin-stdlib:1.9.20'
+	implementation 'org.jetbrains.kotlin:kotlin-stdlib:1.9.22'
 	implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.7.3'
 
 	implementation 'androidx.appcompat:appcompat:1.6.1'
 	implementation 'androidx.core:core-ktx:1.12.0'
-	implementation 'androidx.activity:activity-ktx:1.8.1'
+	implementation 'androidx.activity:activity-ktx:1.8.2'
 	implementation 'androidx.fragment:fragment-ktx:1.6.2'
-	implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.6.2'
+	implementation 'androidx.collection:collection:1.4.0'
-	implementation 'androidx.lifecycle:lifecycle-livedata-ktx:2.6.2'
+	implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.7.0'
-	implementation 'androidx.lifecycle:lifecycle-service:2.6.2'
+	implementation 'androidx.lifecycle:lifecycle-service:2.7.0'
-	implementation 'androidx.lifecycle:lifecycle-process:2.6.2'
+	implementation 'androidx.lifecycle:lifecycle-process:2.7.0'
 	implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
 	implementation 'androidx.swiperefreshlayout:swiperefreshlayout:1.1.0'
 	implementation 'androidx.recyclerview:recyclerview:1.3.2'
 	implementation 'androidx.viewpager2:viewpager2:1.1.0-beta02'
 	implementation 'androidx.preference:preference-ktx:1.2.1'
 	implementation 'androidx.biometric:biometric-ktx:1.2.0-alpha05'
-	implementation 'com.google.android.material:material:1.10.0'
+	implementation 'com.google.android.material:material:1.12.0-alpha03'
-	implementation 'androidx.lifecycle:lifecycle-common-java8:2.6.2'
+	implementation 'androidx.lifecycle:lifecycle-common-java8:2.7.0'
 
-	// TODO https://issuetracker.google.com/issues/254846063
+	implementation 'androidx.work:work-runtime:2.9.0'
-	implementation 'androidx.work:work-runtime-ktx:2.8.1'
 	//noinspection GradleDependency
 	implementation('com.google.guava:guava:32.0.1-android') {
 		exclude group: 'com.google.guava', module: 'failureaccess'
@@ -116,35 +115,39 @@ dependencies {
 		exclude group: 'com.google.j2objc', module: 'j2objc-annotations'
 	}
 
-	implementation 'androidx.room:room-runtime:2.6.0'
+	implementation 'androidx.room:room-runtime:2.6.1'
-	implementation 'androidx.room:room-ktx:2.6.0'
+	implementation 'androidx.room:room-ktx:2.6.1'
-	ksp 'androidx.room:room-compiler:2.6.0'
+	ksp 'androidx.room:room-compiler:2.6.1'
 
 	implementation 'com.squareup.okhttp3:okhttp:4.12.0'
 	implementation 'com.squareup.okhttp3:okhttp-dnsoverhttps:4.12.0'
-	implementation 'com.squareup.okio:okio:3.6.0'
+	implementation 'com.squareup.okio:okio:3.8.0'
 
 	implementation 'com.hannesdorfmann:adapterdelegates4-kotlin-dsl:4.3.2'
 	implementation 'com.hannesdorfmann:adapterdelegates4-kotlin-dsl-viewbinding:4.3.2'
 
-	implementation 'com.google.dagger:hilt-android:2.48.1'
+	implementation 'com.google.dagger:hilt-android:2.50'
-	kapt 'com.google.dagger:hilt-compiler:2.48.1'
+	kapt 'com.google.dagger:hilt-compiler:2.50'
 	implementation 'androidx.hilt:hilt-work:1.1.0'
 	kapt 'androidx.hilt:hilt-compiler:1.1.0'
 
 	implementation 'io.coil-kt:coil-base:2.5.0'
 	implementation 'io.coil-kt:coil-svg:2.5.0'
-	implementation 'com.github.KotatsuApp:subsampling-scale-image-view:c7dab3aefe'
+	implementation 'com.github.KotatsuApp:subsampling-scale-image-view:02e6d6cfe9'
 	implementation 'com.github.solkin:disk-lru-cache:1.4'
 	implementation 'io.noties.markwon:core:4.6.2'
 
 	implementation 'ch.acra:acra-http:5.11.3'
 	implementation 'ch.acra:acra-dialog:5.11.3'
+	compileOnly 'com.google.auto.service:auto-service-annotations:1.1.1'
+	ksp 'dev.zacsweers.autoservice:auto-service-ksp:1.1.0'
 
-	debugImplementation 'com.squareup.leakcanary:leakcanary-android:2.12'
+	implementation 'org.conscrypt:conscrypt-android:2.5.2'
+
+	debugImplementation 'com.squareup.leakcanary:leakcanary-android:2.13'
 
 	testImplementation 'junit:junit:4.13.2'
-	testImplementation 'org.json:json:20231013'
+	testImplementation 'org.json:json:20240205'
 	testImplementation 'org.jetbrains.kotlinx:kotlinx-coroutines-test:1.7.3'
 
 	androidTestImplementation 'androidx.test:runner:1.5.2'
@@ -154,9 +157,9 @@ dependencies {
 
 	androidTestImplementation 'org.jetbrains.kotlinx:kotlinx-coroutines-test:1.7.3'
 
-	androidTestImplementation 'androidx.room:room-testing:2.6.0'
+	androidTestImplementation 'androidx.room:room-testing:2.6.1'
-	androidTestImplementation 'com.squareup.moshi:moshi-kotlin:1.15.0'
+	androidTestImplementation 'com.squareup.moshi:moshi-kotlin:1.15.1'
 
-	androidTestImplementation 'com.google.dagger:hilt-android-testing:2.48.1'
+	androidTestImplementation 'com.google.dagger:hilt-android-testing:2.50'
-	kaptAndroidTest 'com.google.dagger:hilt-android-compiler:2.48.1'
+	kaptAndroidTest 'com.google.dagger:hilt-android-compiler:2.50'
 }

app/src/debug/kotlin/org/koitharu/kotatsu/KotatsuApp.kt

@@ -36,7 +36,7 @@ class KotatsuApp : BaseApp() {
 		FragmentStrictMode.defaultPolicy = FragmentStrictMode.Policy.Builder()
 			.penaltyDeath()
 			.detectFragmentReuse()
-			// .detectWrongFragmentContainer() FIXME: migrate to ViewPager2
+			.detectWrongFragmentContainer()
 			.detectRetainInstanceUsage()
 			.detectSetUserVisibleHint()
 			.detectFragmentTagUsage()

app/src/debug/kotlin/org/koitharu/kotatsu/core/network/CurlLoggingInterceptor.kt

@@ -10,6 +10,8 @@ class CurlLoggingInterceptor(
 	private val curlOptions: String? = null
 ) : Interceptor {
 
+	private val escapeRegex = Regex("([\\[\\]\"])")
+
 	override fun intercept(chain: Interceptor.Chain): Response {
 		val request = chain.request()
 		var isCompressed = false
@@ -40,7 +42,7 @@ class CurlLoggingInterceptor(
 		if (isCompressed) {
 			curlCmd.append(" --compressed")
 		}
-		curlCmd.append(" \"").append(request.url).append('"')
+		curlCmd.append(" \"").append(request.url.toString().escape()).append('"')
 
 		log("---cURL (" + request.url + ")")
 		log(curlCmd.toString())
@@ -48,7 +50,12 @@ class CurlLoggingInterceptor(
 		return chain.proceed(request)
 	}
 
-	private fun String.escape() = replace("\"", "\\\"")
+	private fun String.escape() = replace(escapeRegex) { match ->
+		"\\" + match.value
+	}
+		// .replace("\"", "\\\"")
+		// .replace("[", "\\[")
+		// .replace("]", "\\]")
 
 	private fun log(msg: String) {
 		Log.d("CURL", msg)

app/src/main/kotlin/org/koitharu/kotatsu/bookmarks/data/EntityMapping.kt

@@ -2,7 +2,7 @@ package org.koitharu.kotatsu.bookmarks.data
 
 import org.koitharu.kotatsu.bookmarks.domain.Bookmark
 import org.koitharu.kotatsu.parsers.model.Manga
-import java.util.Date
+import java.time.Instant
 
 fun BookmarkEntity.toBookmark(manga: Manga) = Bookmark(
 	manga = manga,
@@ -11,7 +11,7 @@ fun BookmarkEntity.toBookmark(manga: Manga) = Bookmark(
 	page = page,
 	scroll = scroll,
 	imageUrl = imageUrl,
-	createdAt = Date(createdAt),
+	createdAt = Instant.ofEpochMilli(createdAt),
 	percent = percent,
 )
 
@@ -22,7 +22,7 @@ fun Bookmark.toEntity() = BookmarkEntity(
 	page = page,
 	scroll = scroll,
 	imageUrl = imageUrl,
-	createdAt = createdAt.time,
+	createdAt = createdAt.toEpochMilli(),
 	percent = percent,
 )
 

app/src/main/kotlin/org/koitharu/kotatsu/bookmarks/domain/Bookmark.kt

@@ -4,7 +4,7 @@ import org.koitharu.kotatsu.list.ui.model.ListModel
 import org.koitharu.kotatsu.local.data.hasImageExtension
 import org.koitharu.kotatsu.parsers.model.Manga
 import org.koitharu.kotatsu.parsers.model.MangaPage
-import java.util.Date
+import java.time.Instant
 
 data class Bookmark(
 	val manga: Manga,
@@ -13,7 +13,7 @@ data class Bookmark(
 	val page: Int,
 	val scroll: Int,
 	val imageUrl: String,
-	val createdAt: Date,
+	val createdAt: Instant,
 	val percent: Float,
 ) : ListModel {
 

app/src/main/kotlin/org/koitharu/kotatsu/bookmarks/ui/sheet/BookmarksAdapter.kt

@@ -13,7 +13,6 @@ import org.koitharu.kotatsu.list.ui.adapter.emptyStateListAD
 import org.koitharu.kotatsu.list.ui.adapter.listHeaderAD
 import org.koitharu.kotatsu.list.ui.adapter.loadingFooterAD
 import org.koitharu.kotatsu.list.ui.adapter.loadingStateAD
-import org.koitharu.kotatsu.list.ui.model.ListHeader
 import org.koitharu.kotatsu.list.ui.model.ListModel
 
 class BookmarksAdapter(
@@ -32,13 +31,6 @@ class BookmarksAdapter(
 	}
 
 	override fun getSectionText(context: Context, position: Int): CharSequence? {
-		val list = items
+		return findHeader(position)?.getText(context)
-		for (i in (0..position).reversed()) {
-			val item = list.getOrNull(i) ?: continue
-			if (item is ListHeader) {
-				return item.getText(context)
-			}
-		}
-		return null
 	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/browser/cloudflare/CaptchaNotifier.kt

@@ -13,6 +13,7 @@ import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.exceptions.CloudFlareProtectedException
 import org.koitharu.kotatsu.core.util.ext.checkNotificationPermission
 import org.koitharu.kotatsu.parsers.model.ContentType
+import org.koitharu.kotatsu.parsers.model.MangaSource
 
 class CaptchaNotifier(
 	private val context: Context,
@@ -58,16 +59,27 @@ class CaptchaNotifier(
 		manager.notify(TAG, exception.source.hashCode(), notification)
 	}
 
+	fun dismiss(source: MangaSource) {
+		NotificationManagerCompat.from(context).cancel(TAG, source.hashCode())
+	}
+
 	override fun onError(request: ImageRequest, result: ErrorResult) {
 		super.onError(request, result)
 		val e = result.throwable
-		if (e is CloudFlareProtectedException) {
+		if (e is CloudFlareProtectedException && request.parameters.value<Boolean>(PARAM_IGNORE_CAPTCHA) != true) {
 			notify(e)
 		}
 	}
 
-	private companion object {
+	companion object {
 
+		fun ImageRequest.Builder.ignoreCaptchaErrors() = setParameter(
+			key = PARAM_IGNORE_CAPTCHA,
+			value = true,
+			memoryCacheKey = null,
+		)
+
+		private const val PARAM_IGNORE_CAPTCHA = "ignore_captcha"
 		private const val CHANNEL_ID = "captcha"
 		private const val TAG = CHANNEL_ID
 	}

app/src/main/kotlin/org/koitharu/kotatsu/core/BaseApp.kt

@@ -2,6 +2,7 @@ package org.koitharu.kotatsu.core
 
 import android.app.Application
 import android.content.Context
+import android.os.Build
 import androidx.annotation.WorkerThread
 import androidx.appcompat.app.AppCompatDelegate
 import androidx.hilt.work.HiltWorkerFactory
@@ -11,6 +12,7 @@ import androidx.work.WorkManager
 import dagger.hilt.android.HiltAndroidApp
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
 import org.acra.ACRA
 import org.acra.ReportField
 import org.acra.config.dialog
@@ -18,6 +20,7 @@ import org.acra.config.httpSender
 import org.acra.data.StringFormat
 import org.acra.ktx.initAcra
 import org.acra.sender.HttpSender
+import org.conscrypt.Conscrypt
 import org.koitharu.kotatsu.BuildConfig
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.db.MangaDatabase
@@ -26,6 +29,7 @@ import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.util.WorkServiceStopHelper
 import org.koitharu.kotatsu.core.util.ext.processLifecycleScope
 import org.koitharu.kotatsu.settings.work.WorkScheduleManager
+import java.security.Security
 import javax.inject.Inject
 import javax.inject.Provider
 
@@ -39,7 +43,7 @@ open class BaseApp : Application(), Configuration.Provider {
 	lateinit var activityLifecycleCallbacks: Set<@JvmSuppressWildcards ActivityLifecycleCallbacks>
 
 	@Inject
-	lateinit var database: MangaDatabase
+	lateinit var database: Provider<MangaDatabase>
 
 	@Inject
 	lateinit var settings: AppSettings
@@ -56,12 +60,26 @@ open class BaseApp : Application(), Configuration.Provider {
 	@Inject
 	lateinit var workManagerProvider: Provider<WorkManager>
 
+	override val workManagerConfiguration: Configuration
+		get() = Configuration.Builder()
+			.setWorkerFactory(workerFactory)
+			.build()
+
 	override fun onCreate() {
 		super.onCreate()
-		ACRA.errorReporter.putCustomData("isOriginalApp", appValidator.isOriginalApp.toString())
 		AppCompatDelegate.setDefaultNightMode(settings.theme)
 		AppCompatDelegate.setApplicationLocales(settings.appLocales)
+		// TLS 1.3 support for Android < 10
+		if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
+			Security.insertProviderAt(Conscrypt.newProvider(), 1)
+		}
 		setupActivityLifecycleCallbacks()
+		processLifecycleScope.launch {
+			val isOriginalApp = withContext(Dispatchers.Default) {
+				appValidator.isOriginalApp
+			}
+			ACRA.errorReporter.putCustomData("isOriginalApp", isOriginalApp.toString())
+		}
 		processLifecycleScope.launch(Dispatchers.Default) {
 			setupDatabaseObservers()
 		}
@@ -74,13 +92,6 @@ open class BaseApp : Application(), Configuration.Provider {
 		initAcra {
 			buildConfigClass = BuildConfig::class.java
 			reportFormat = StringFormat.JSON
-			excludeMatchingSharedPreferencesKeys = listOf(
-				"sources_\\w+",
-				AppSettings.KEY_APP_PASSWORD,
-				AppSettings.KEY_PROXY_LOGIN,
-				AppSettings.KEY_PROXY_ADDRESS,
-				AppSettings.KEY_PROXY_PASSWORD,
-			)
 			httpSender {
 				uri = getString(R.string.url_error_report)
 				basicAuthLogin = getString(R.string.acra_login)
@@ -97,7 +108,6 @@ open class BaseApp : Application(), Configuration.Provider {
 				ReportField.STACK_TRACE,
 				ReportField.CRASH_CONFIGURATION,
 				ReportField.CUSTOM_DATA,
-				ReportField.SHARED_PREFERENCES,
 			)
 
 			dialog {
@@ -110,15 +120,9 @@ open class BaseApp : Application(), Configuration.Provider {
 		}
 	}
 
-	override fun getWorkManagerConfiguration(): Configuration {
-		return Configuration.Builder()
-			.setWorkerFactory(workerFactory)
-			.build()
-	}
-
 	@WorkerThread
 	private fun setupDatabaseObservers() {
-		val tracker = database.invalidationTracker
+		val tracker = database.get().invalidationTracker
 		databaseObservers.forEach {
 			tracker.addObserver(it)
 		}

app/src/main/kotlin/org/koitharu/kotatsu/core/ErrorReportingAdmin.kt

@@ -0,0 +1,24 @@
+package org.koitharu.kotatsu.core
+
+import android.content.Context
+import com.google.auto.service.AutoService
+import org.acra.builder.ReportBuilder
+import org.acra.config.CoreConfiguration
+import org.acra.config.ReportingAdministrator
+
+@AutoService(ReportingAdministrator::class)
+class ErrorReportingAdmin : ReportingAdministrator {
+
+	override fun shouldStartCollecting(
+		context: Context,
+		config: CoreConfiguration,
+		reportBuilder: ReportBuilder
+	): Boolean {
+		return reportBuilder.exception?.isDeadOs() != true
+	}
+
+	private fun Throwable.isDeadOs(): Boolean {
+		val className = javaClass.simpleName
+		return className == "DeadSystemException" || className == "DeadSystemRuntimeException" || cause?.isDeadOs() == true
+	}
+}

app/src/main/kotlin/org/koitharu/kotatsu/core/backup/BackupEntry.kt

@@ -3,17 +3,20 @@ package org.koitharu.kotatsu.core.backup
 import org.json.JSONArray
 
 class BackupEntry(
-	val name: String,
+	val name: Name,
 	val data: JSONArray
 ) {
 
-	companion object Names {
+	enum class Name(
+		val key: String,
+	) {
 
-		const val INDEX = "index"
+		INDEX("index"),
-		const val HISTORY = "history"
+		HISTORY("history"),
-		const val CATEGORIES = "categories"
+		CATEGORIES("categories"),
-		const val FAVOURITES = "favourites"
+		FAVOURITES("favourites"),
-		const val SETTINGS = "settings"
+		SETTINGS("settings"),
-		const val BOOKMARKS = "bookmarks"
+		BOOKMARKS("bookmarks"),
+		SOURCES("sources"),
 	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/core/backup/BackupRepository.kt

@@ -7,8 +7,10 @@ import org.koitharu.kotatsu.BuildConfig
 import org.koitharu.kotatsu.core.db.MangaDatabase
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.parsers.util.json.JSONIterator
+import org.koitharu.kotatsu.parsers.util.json.getLongOrDefault
 import org.koitharu.kotatsu.parsers.util.json.mapJSON
 import org.koitharu.kotatsu.parsers.util.runCatchingCancellable
+import java.util.Date
 import javax.inject.Inject
 
 private const val PAGE_SIZE = 10
@@ -20,7 +22,7 @@ class BackupRepository @Inject constructor(
 
 	suspend fun dumpHistory(): BackupEntry {
 		var offset = 0
-		val entry = BackupEntry(BackupEntry.HISTORY, JSONArray())
+		val entry = BackupEntry(BackupEntry.Name.HISTORY, JSONArray())
 		while (true) {
 			val history = db.getHistoryDao().findAll(offset, PAGE_SIZE)
 			if (history.isEmpty()) {
@@ -41,7 +43,7 @@ class BackupRepository @Inject constructor(
 	}
 
 	suspend fun dumpCategories(): BackupEntry {
-		val entry = BackupEntry(BackupEntry.CATEGORIES, JSONArray())
+		val entry = BackupEntry(BackupEntry.Name.CATEGORIES, JSONArray())
 		val categories = db.getFavouriteCategoriesDao().findAll()
 		for (item in categories) {
 			entry.data.put(JsonSerializer(item).toJson())
@@ -51,9 +53,9 @@ class BackupRepository @Inject constructor(
 
 	suspend fun dumpFavourites(): BackupEntry {
 		var offset = 0
-		val entry = BackupEntry(BackupEntry.FAVOURITES, JSONArray())
+		val entry = BackupEntry(BackupEntry.Name.FAVOURITES, JSONArray())
 		while (true) {
-			val favourites = db.getFavouritesDao().findAll(offset, PAGE_SIZE)
+			val favourites = db.getFavouritesDao().findAllRaw(offset, PAGE_SIZE)
 			if (favourites.isEmpty()) {
 				break
 			}
@@ -72,7 +74,7 @@ class BackupRepository @Inject constructor(
 	}
 
 	suspend fun dumpBookmarks(): BackupEntry {
-		val entry = BackupEntry(BackupEntry.BOOKMARKS, JSONArray())
+		val entry = BackupEntry(BackupEntry.Name.BOOKMARKS, JSONArray())
 		val all = db.getBookmarksDao().findAll()
 		for ((m, b) in all) {
 			val json = JSONObject()
@@ -90,7 +92,7 @@ class BackupRepository @Inject constructor(
 	}
 
 	fun dumpSettings(): BackupEntry {
-		val entry = BackupEntry(BackupEntry.SETTINGS, JSONArray())
+		val entry = BackupEntry(BackupEntry.Name.SETTINGS, JSONArray())
 		val settingsDump = settings.getAllValues().toMutableMap()
 		settingsDump.remove(AppSettings.KEY_APP_PASSWORD)
 		settingsDump.remove(AppSettings.KEY_PROXY_PASSWORD)
@@ -101,8 +103,18 @@ class BackupRepository @Inject constructor(
 		return entry
 	}
 
+	suspend fun dumpSources(): BackupEntry {
+		val entry = BackupEntry(BackupEntry.Name.SOURCES, JSONArray())
+		val all = db.getSourcesDao().findAll()
+		for (source in all) {
+			val json = JsonSerializer(source).toJson()
+			entry.data.put(json)
+		}
+		return entry
+	}
+
 	fun createIndex(): BackupEntry {
-		val entry = BackupEntry(BackupEntry.INDEX, JSONArray())
+		val entry = BackupEntry(BackupEntry.Name.INDEX, JSONArray())
 		val json = JSONObject()
 		json.put("app_id", BuildConfig.APPLICATION_ID)
 		json.put("app_version", BuildConfig.VERSION_CODE)
@@ -111,6 +123,11 @@ class BackupRepository @Inject constructor(
 		return entry
 	}
 
+	fun getBackupDate(entry: BackupEntry?): Date? {
+		val timestamp = entry?.data?.optJSONObject(0)?.getLongOrDefault("created_at", 0) ?: 0
+		return if (timestamp == 0L) null else Date(timestamp)
+	}
+
 	suspend fun restoreHistory(entry: BackupEntry): CompositeResult {
 		val result = CompositeResult()
 		for (item in entry.data.JSONIterator()) {
@@ -184,6 +201,17 @@ class BackupRepository @Inject constructor(
 		return result
 	}
 
+	suspend fun restoreSources(entry: BackupEntry): CompositeResult {
+		val result = CompositeResult()
+		for (item in entry.data.JSONIterator()) {
+			val source = JsonDeserializer(item).toMangaSourceEntity()
+			result += runCatchingCancellable {
+				db.getSourcesDao().upsert(source)
+			}
+		}
+		return result
+	}
+
 	fun restoreSettings(entry: BackupEntry): CompositeResult {
 		val result = CompositeResult()
 		for (item in entry.data.JSONIterator()) {

app/src/main/kotlin/org/koitharu/kotatsu/core/backup/BackupZipInput.kt

@@ -1,25 +1,44 @@
 package org.koitharu.kotatsu.core.backup
 
+import kotlinx.coroutines.CoroutineStart
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
 import kotlinx.coroutines.runInterruptible
 import okio.Closeable
 import org.json.JSONArray
+import org.koitharu.kotatsu.core.util.ext.processLifecycleScope
 import java.io.File
+import java.util.EnumSet
 import java.util.zip.ZipFile
 
 class BackupZipInput(val file: File) : Closeable {
 
 	private val zipFile = ZipFile(file)
 
-	suspend fun getEntry(name: String): BackupEntry? = runInterruptible(Dispatchers.IO) {
+	suspend fun getEntry(name: BackupEntry.Name): BackupEntry? = runInterruptible(Dispatchers.IO) {
-		val entry = zipFile.getEntry(name) ?: return@runInterruptible null
+		val entry = zipFile.getEntry(name.key) ?: return@runInterruptible null
 		val json = zipFile.getInputStream(entry).use {
 			JSONArray(it.bufferedReader().readText())
 		}
 		BackupEntry(name, json)
 	}
 
+	suspend fun entries(): Set<BackupEntry.Name> = runInterruptible(Dispatchers.IO) {
+		zipFile.entries().toList().mapNotNullTo(EnumSet.noneOf(BackupEntry.Name::class.java)) { ze ->
+			BackupEntry.Name.entries.find { it.key == ze.name }
+		}
+	}
+
 	override fun close() {
 		zipFile.close()
 	}
+
+	fun cleanupAsync() {
+		processLifecycleScope.launch(Dispatchers.IO, CoroutineStart.ATOMIC) {
+			runCatching {
+				close()
+				file.delete()
+			}
+		}
+	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/core/backup/BackupZipOutput.kt

@@ -5,10 +5,10 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.runInterruptible
 import okio.Closeable
 import org.koitharu.kotatsu.R
-import org.koitharu.kotatsu.core.util.ext.format
 import org.koitharu.kotatsu.core.zip.ZipOutput
 import java.io.File
-import java.util.Date
+import java.time.LocalDate
+import java.time.format.DateTimeFormatter
 import java.util.Locale
 import java.util.zip.Deflater
 
@@ -17,7 +17,7 @@ class BackupZipOutput(val file: File) : Closeable {
 	private val output = ZipOutput(file, Deflater.BEST_COMPRESSION)
 
 	suspend fun put(entry: BackupEntry) = runInterruptible(Dispatchers.IO) {
-		output.put(entry.name, entry.data.toString(2))
+		output.put(entry.name.key, entry.data.toString(2))
 	}
 
 	suspend fun finish() = runInterruptible(Dispatchers.IO) {
@@ -39,7 +39,7 @@ suspend fun BackupZipOutput(context: Context): BackupZipOutput = runInterruptibl
 	val filename = buildString {
 		append(context.getString(R.string.app_name).replace(' ', '_').lowercase(Locale.ROOT))
 		append('_')
-		append(Date().format("ddMMyyyy"))
+		append(LocalDate.now().format(DateTimeFormatter.ofPattern("ddMMyyyy")))
 		append(".bk.zip")
 	}
 	BackupZipOutput(File(dir, filename))

app/src/main/kotlin/org/koitharu/kotatsu/core/backup/JsonDeserializer.kt

@@ -3,6 +3,7 @@ package org.koitharu.kotatsu.core.backup
 import org.json.JSONObject
 import org.koitharu.kotatsu.bookmarks.data.BookmarkEntity
 import org.koitharu.kotatsu.core.db.entity.MangaEntity
+import org.koitharu.kotatsu.core.db.entity.MangaSourceEntity
 import org.koitharu.kotatsu.core.db.entity.TagEntity
 import org.koitharu.kotatsu.favourites.data.FavouriteCategoryEntity
 import org.koitharu.kotatsu.favourites.data.FavouriteEntity
@@ -78,6 +79,12 @@ class JsonDeserializer(private val json: JSONObject) {
 		percent = json.getDouble("percent").toFloat(),
 	)
 
+	fun toMangaSourceEntity() = MangaSourceEntity(
+		source = json.getString("source"),
+		isEnabled = json.getBoolean("enabled"),
+		sortKey = json.getInt("sort_key"),
+	)
+
 	fun toMap(): Map<String, Any?> {
 		val map = mutableMapOf<String, Any?>()
 		val keys = json.keys()

app/src/main/kotlin/org/koitharu/kotatsu/core/backup/JsonSerializer.kt

@@ -3,6 +3,7 @@ package org.koitharu.kotatsu.core.backup
 import org.json.JSONObject
 import org.koitharu.kotatsu.bookmarks.data.BookmarkEntity
 import org.koitharu.kotatsu.core.db.entity.MangaEntity
+import org.koitharu.kotatsu.core.db.entity.MangaSourceEntity
 import org.koitharu.kotatsu.core.db.entity.TagEntity
 import org.koitharu.kotatsu.favourites.data.FavouriteCategoryEntity
 import org.koitharu.kotatsu.favourites.data.FavouriteEntity
@@ -82,6 +83,14 @@ class JsonSerializer private constructor(private val json: JSONObject) {
 		},
 	)
 
+	constructor(e: MangaSourceEntity) : this(
+		JSONObject().apply {
+			put("source", e.source)
+			put("enabled", e.isEnabled)
+			put("sort_key", e.sortKey)
+		},
+	)
+
 	constructor(m: Map<String, *>) : this(
 		JSONObject(m),
 	)

app/src/main/kotlin/org/koitharu/kotatsu/core/cache/ExpiringLruCache.kt

@@ -12,7 +12,7 @@ class ExpiringLruCache<T>(
 	private val cache = LruCache<ContentCache.Key, ExpiringValue<T>>(maxSize)
 
 	operator fun get(key: ContentCache.Key): T? {
-		val value = cache.get(key) ?: return null
+		val value = cache[key] ?: return null
 		if (value.isExpired) {
 			cache.remove(key)
 		}

app/src/main/kotlin/org/koitharu/kotatsu/core/db/MangaDatabase.kt

@@ -29,6 +29,7 @@ import org.koitharu.kotatsu.core.db.migrations.Migration13To14
 import org.koitharu.kotatsu.core.db.migrations.Migration14To15
 import org.koitharu.kotatsu.core.db.migrations.Migration15To16
 import org.koitharu.kotatsu.core.db.migrations.Migration16To17
+import org.koitharu.kotatsu.core.db.migrations.Migration17To18
 import org.koitharu.kotatsu.core.db.migrations.Migration1To2
 import org.koitharu.kotatsu.core.db.migrations.Migration2To3
 import org.koitharu.kotatsu.core.db.migrations.Migration3To4
@@ -53,7 +54,7 @@ import org.koitharu.kotatsu.tracker.data.TrackEntity
 import org.koitharu.kotatsu.tracker.data.TrackLogEntity
 import org.koitharu.kotatsu.tracker.data.TracksDao
 
-const val DATABASE_VERSION = 17
+const val DATABASE_VERSION = 18
 
 @Database(
 	entities = [
@@ -108,6 +109,7 @@ fun getDatabaseMigrations(context: Context): Array<Migration> = arrayOf(
 	Migration14To15(),
 	Migration15To16(),
 	Migration16To17(context),
+	Migration17To18(),
 )
 
 fun MangaDatabase(context: Context): MangaDatabase = Room

app/src/main/kotlin/org/koitharu/kotatsu/core/db/dao/MangaDao.kt

@@ -1,6 +1,7 @@
 package org.koitharu.kotatsu.core.db.dao
 
 import androidx.room.Dao
+import androidx.room.Delete
 import androidx.room.Insert
 import androidx.room.OnConflictStrategy
 import androidx.room.Query
@@ -23,6 +24,10 @@ abstract class MangaDao {
 	@Query("SELECT * FROM manga WHERE public_url = :publicUrl")
 	abstract suspend fun findByPublicUrl(publicUrl: String): MangaWithTags?
 
+	@Transaction
+	@Query("SELECT * FROM manga WHERE source = :source")
+	abstract suspend fun findAllBySource(source: String): List<MangaWithTags>
+
 	@Transaction
 	@Query("SELECT * FROM manga WHERE (title LIKE :query OR alt_title LIKE :query) AND manga_id IN (SELECT manga_id FROM favourites UNION SELECT manga_id FROM history) LIMIT :limit")
 	abstract suspend fun searchByTitle(query: String, limit: Int): List<MangaWithTags>
@@ -43,6 +48,10 @@ abstract class MangaDao {
 	@Query("DELETE FROM manga_tags WHERE manga_id = :mangaId")
 	abstract suspend fun clearTagRelation(mangaId: Long)
 
+	@Transaction
+	@Delete
+	abstract suspend fun delete(subjects: Collection<MangaEntity>)
+
 	@Transaction
 	open suspend fun upsert(manga: MangaEntity, tags: Iterable<TagEntity>? = null) {
 		upsert(manga)

app/src/main/kotlin/org/koitharu/kotatsu/core/db/dao/TagsDao.kt

@@ -31,6 +31,16 @@ abstract class TagsDao {
 	)
 	abstract suspend fun findPopularTags(source: String, limit: Int): List<TagEntity>
 
+	@Query(
+		"""SELECT tags.* FROM tags
+		LEFT JOIN manga_tags ON tags.tag_id = manga_tags.tag_id 
+		WHERE tags.source = :source  
+		GROUP BY tags.title
+		ORDER BY COUNT(manga_id) ASC 
+		LIMIT :limit""",
+	)
+	abstract suspend fun findRareTags(source: String, limit: Int): List<TagEntity>
+
 	@Query(
 		"""SELECT tags.* FROM tags
 		LEFT JOIN manga_tags ON tags.tag_id = manga_tags.tag_id 

app/src/main/kotlin/org/koitharu/kotatsu/core/db/entity/MangaPrefsEntity.kt

@@ -24,4 +24,5 @@ data class MangaPrefsEntity(
 	@ColumnInfo(name = "cf_brightness") val cfBrightness: Float,
 	@ColumnInfo(name = "cf_contrast") val cfContrast: Float,
 	@ColumnInfo(name = "cf_invert") val cfInvert: Boolean,
+	@ColumnInfo(name = "cf_grayscale") val cfGrayscale: Boolean,
 )

app/src/main/kotlin/org/koitharu/kotatsu/core/db/migrations/Migration17To18.kt

@@ -0,0 +1,11 @@
+package org.koitharu.kotatsu.core.db.migrations
+
+import androidx.room.migration.Migration
+import androidx.sqlite.db.SupportSQLiteDatabase
+
+class Migration17To18 : Migration(17, 18) {
+
+	override fun migrate(db: SupportSQLiteDatabase) {
+		db.execSQL("ALTER TABLE preferences ADD COLUMN `cf_grayscale` INTEGER NOT NULL DEFAULT 0")
+	}
+}

app/src/main/kotlin/org/koitharu/kotatsu/core/exceptions/CompositeException.kt

@@ -1,8 +0,0 @@
-package org.koitharu.kotatsu.core.exceptions
-
-import org.koitharu.kotatsu.parsers.util.mapNotNullToSet
-
-class CompositeException(val errors: Collection<Throwable>) : Exception() {
-
-	override val message: String = errors.mapNotNullToSet { it.message }.joinToString()
-}

app/src/main/kotlin/org/koitharu/kotatsu/core/exceptions/TooManyRequestExceptions.kt

@@ -1,13 +1,13 @@
 package org.koitharu.kotatsu.core.exceptions
 
 import okio.IOException
-import java.util.Date
+import java.time.Instant
+import java.time.temporal.ChronoUnit
 
 class TooManyRequestExceptions(
 	val url: String,
-	val retryAt: Date?,
+	val retryAt: Instant?,
 ) : IOException() {
-
 	val retryAfter: Long
-		get() = if (retryAt == null) 0 else (retryAt.time - System.currentTimeMillis()).coerceAtLeast(0)
+		get() = retryAt?.until(Instant.now(), ChronoUnit.MILLIS) ?: 0
 }

app/src/main/kotlin/org/koitharu/kotatsu/core/logs/FileLogger.kt

@@ -20,8 +20,9 @@ import org.koitharu.kotatsu.parsers.util.runCatchingCancellable
 import org.koitharu.kotatsu.core.util.ext.printStackTraceDebug
 import java.io.File
 import java.io.FileOutputStream
-import java.text.SimpleDateFormat
+import java.time.LocalDateTime
-import java.util.Date
+import java.time.format.DateTimeFormatter
+import java.time.format.FormatStyle
 import java.util.Locale
 import java.util.concurrent.ConcurrentLinkedQueue
 
@@ -41,11 +42,7 @@ class FileLogger(
 	}
 	val isEnabled: Boolean
 		get() = settings.isLoggingEnabled
-	private val dateFormat = SimpleDateFormat.getDateTimeInstance(
+	private val dateTimeFormatter = DateTimeFormatter.ofLocalizedDateTime(FormatStyle.SHORT).withLocale(Locale.ROOT)
-		SimpleDateFormat.SHORT,
-		SimpleDateFormat.SHORT,
-		Locale.ROOT,
-	)
 	private val buffer = ConcurrentLinkedQueue<String>()
 	private val mutex = Mutex()
 	private var flushJob: Job? = null
@@ -55,7 +52,7 @@ class FileLogger(
 			return
 		}
 		val text = buildString {
-			append(dateFormat.format(Date()))
+			append(dateTimeFormatter.format(LocalDateTime.now()))
 			append(": ")
 			if (e != null) {
 				append("E!")

app/src/main/kotlin/org/koitharu/kotatsu/core/model/FavouriteCategory.kt

@@ -5,7 +5,7 @@ import kotlinx.parcelize.Parcelize
 import org.koitharu.kotatsu.list.domain.ListSortOrder
 import org.koitharu.kotatsu.list.ui.ListModelDiffCallback
 import org.koitharu.kotatsu.list.ui.model.ListModel
-import java.util.Date
+import java.time.Instant
 
 @Parcelize
 data class FavouriteCategory(
@@ -13,7 +13,7 @@ data class FavouriteCategory(
 	val title: String,
 	val sortKey: Int,
 	val order: ListSortOrder,
-	val createdAt: Date,
+	val createdAt: Instant,
 	val isTrackingEnabled: Boolean,
 	val isVisibleInLibrary: Boolean,
 ) : Parcelable, ListModel {

app/src/main/kotlin/org/koitharu/kotatsu/core/model/Manga.kt

@@ -1,16 +1,22 @@
 package org.koitharu.kotatsu.core.model
 
 import android.net.Uri
+import androidx.annotation.DrawableRes
 import androidx.annotation.StringRes
+import androidx.collection.MutableObjectIntMap
 import androidx.core.os.LocaleListCompat
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.util.ext.iterator
 import org.koitharu.kotatsu.details.ui.model.ChapterListItem
+import org.koitharu.kotatsu.parsers.model.ContentRating
 import org.koitharu.kotatsu.parsers.model.Manga
 import org.koitharu.kotatsu.parsers.model.MangaChapter
 import org.koitharu.kotatsu.parsers.model.MangaSource
 import org.koitharu.kotatsu.parsers.model.MangaState
 import org.koitharu.kotatsu.parsers.util.mapToSet
+import java.text.DecimalFormat
+import java.text.DecimalFormatSymbols
+import com.google.android.material.R as materialR
 
 @JvmName("mangaIds")
 fun Collection<Manga>.ids() = mapToSet { it.id }
@@ -26,12 +32,14 @@ fun Collection<ChapterListItem>.countChaptersByBranch(): Int {
 	if (size <= 1) {
 		return size
 	}
-	val acc = HashMap<String?, Int>()
+	val acc = MutableObjectIntMap<String?>()
 	for (item in this) {
 		val branch = item.chapter.branch
-		acc[branch] = (acc[branch] ?: 0) + 1
+		acc[branch] = acc.getOrDefault(branch, 0) + 1
 	}
-	return acc.values.max()
+	var max = 0
+	acc.forEachValue { x -> if (x > max) max = x }
+	return max
 }
 
 @get:StringRes
@@ -41,6 +49,25 @@ val MangaState.titleResId: Int
 		MangaState.FINISHED -> R.string.state_finished
 		MangaState.ABANDONED -> R.string.state_abandoned
 		MangaState.PAUSED -> R.string.state_paused
+		MangaState.UPCOMING -> R.string.state_upcoming
+	}
+
+@get:DrawableRes
+val MangaState.iconResId: Int
+	get() = when (this) {
+		MangaState.ONGOING -> R.drawable.ic_play
+		MangaState.FINISHED -> R.drawable.ic_state_finished
+		MangaState.ABANDONED -> R.drawable.ic_state_abandoned
+		MangaState.PAUSED -> R.drawable.ic_action_pause
+		MangaState.UPCOMING -> materialR.drawable.ic_clock_black_24dp
+	}
+
+@get:StringRes
+val ContentRating.titleResId: Int
+	get() = when (this) {
+		ContentRating.SAFE -> R.string.rating_safe
+		ContentRating.SUGGESTIVE -> R.string.rating_suggestive
+		ContentRating.ADULT -> R.string.rating_adult
 	}
 
 fun Manga.findChapter(id: Long): MangaChapter? {
@@ -91,3 +118,16 @@ val Manga.appUrl: Uri
 		.appendQueryParameter("name", title)
 		.appendQueryParameter("url", url)
 		.build()
+
+private val chaptersNumberFormat = DecimalFormat("#.#").also { f ->
+	f.decimalFormatSymbols = DecimalFormatSymbols.getInstance().also {
+		it.decimalSeparator = '.'
+	}
+}
+
+fun MangaChapter.formatNumber(): String? {
+	if (number <= 0f) {
+		return null
+	}
+	return chaptersNumberFormat.format(number.toDouble())
+}

app/src/main/kotlin/org/koitharu/kotatsu/core/model/MangaHistory.kt

@@ -2,14 +2,14 @@ package org.koitharu.kotatsu.core.model
 
 import android.os.Parcelable
 import kotlinx.parcelize.Parcelize
-import java.util.*
+import java.time.Instant
 
 @Parcelize
 data class MangaHistory(
-	val createdAt: Date,
+	val createdAt: Instant,
-	val updatedAt: Date,
+	val updatedAt: Instant,
 	val chapterId: Long,
 	val page: Int,
 	val scroll: Int,
 	val percent: Float,
-) : Parcelable
+) : Parcelable

app/src/main/kotlin/org/koitharu/kotatsu/core/model/MangaSource.kt

@@ -1,17 +1,23 @@
 package org.koitharu.kotatsu.core.model
 
 import android.content.Context
+import android.graphics.Color
+import android.text.SpannableStringBuilder
+import android.text.style.ForegroundColorSpan
+import android.text.style.RelativeSizeSpan
+import android.text.style.SuperscriptSpan
 import androidx.annotation.StringRes
+import androidx.core.text.buildSpannedString
+import androidx.core.text.inSpans
 import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.core.util.ext.getDisplayName
+import org.koitharu.kotatsu.core.util.ext.getThemeColor
+import org.koitharu.kotatsu.core.util.ext.toLocale
 import org.koitharu.kotatsu.parsers.model.ContentType
 import org.koitharu.kotatsu.parsers.model.MangaSource
 import org.koitharu.kotatsu.parsers.util.toTitleCase
 import java.util.Locale
-
+import com.google.android.material.R as materialR
-fun MangaSource.getLocaleTitle(): String? {
-	val lc = Locale(locale ?: return null)
-	return lc.getDisplayLanguage(lc).toTitleCase(lc)
-}
 
 fun MangaSource(name: String): MangaSource {
 	MangaSource.entries.forEach {
@@ -33,6 +39,24 @@ val ContentType.titleResId
 
 fun MangaSource.getSummary(context: Context): String {
 	val type = context.getString(contentType.titleResId)
-	val locale = getLocaleTitle() ?: context.getString(R.string.various_languages)
+	val locale = locale?.toLocale().getDisplayName(context)
 	return context.getString(R.string.source_summary_pattern, type, locale)
 }
+
+fun MangaSource.getTitle(context: Context): CharSequence = if (isNsfw()) {
+	buildSpannedString {
+		append(title)
+		append(' ')
+		appendNsfwLabel(context)
+	}
+} else {
+	title
+}
+
+private fun SpannableStringBuilder.appendNsfwLabel(context: Context) = inSpans(
+	ForegroundColorSpan(context.getThemeColor(materialR.attr.colorError, Color.RED)),
+	RelativeSizeSpan(0.74f),
+	SuperscriptSpan(),
+) {
+	append(context.getString(R.string.nsfw))
+}

app/src/main/kotlin/org/koitharu/kotatsu/core/model/parcelable/ParcelableChapter.kt

@@ -19,7 +19,8 @@ data class ParcelableChapter(
 			MangaChapter(
 				id = parcel.readLong(),
 				name = parcel.readString().orEmpty(),
-				number = parcel.readInt(),
+				number = parcel.readFloat(),
+				volume = parcel.readInt(),
 				url = parcel.readString().orEmpty(),
 				scanlator = parcel.readString(),
 				uploadDate = parcel.readLong(),
@@ -31,7 +32,8 @@ data class ParcelableChapter(
 		override fun ParcelableChapter.write(parcel: Parcel, flags: Int) = with(chapter) {
 			parcel.writeLong(id)
 			parcel.writeString(name)
-			parcel.writeInt(number)
+			parcel.writeFloat(number)
+			parcel.writeInt(volume)
 			parcel.writeString(url)
 			parcel.writeString(scanlator)
 			parcel.writeLong(uploadDate)

app/src/main/kotlin/org/koitharu/kotatsu/core/network/ImageProxyInterceptor.kt

@@ -7,6 +7,7 @@ import coil.request.ErrorResult
 import coil.request.ImageResult
 import coil.request.SuccessResult
 import coil.size.Dimension
+import coil.size.isOriginal
 import okhttp3.HttpUrl
 import okhttp3.HttpUrl.Companion.toHttpUrlOrNull
 import okhttp3.OkHttpClient
@@ -46,11 +47,13 @@ class ImageProxyInterceptor @Inject constructor(
 			.scheme("https")
 			.host("wsrv.nl")
 			.addQueryParameter("url", url.toString())
-			.addQueryParameter("fit", "outside")
 			.addQueryParameter("we", null)
 		val size = request.sizeResolver.size()
-		(size.height as? Dimension.Pixels)?.let { newUrl.addQueryParameter("h", it.toString()) }
+		if (!size.isOriginal) {
-		(size.width as? Dimension.Pixels)?.let { newUrl.addQueryParameter("w", it.toString()) }
+			newUrl.addQueryParameter("crop", "cover")
+			(size.height as? Dimension.Pixels)?.let { newUrl.addQueryParameter("h", it.toString()) }
+			(size.width as? Dimension.Pixels)?.let { newUrl.addQueryParameter("w", it.toString()) }
+		}
 
 		val newRequest = request.newBuilder()
 			.data(newUrl.build())

app/src/main/kotlin/org/koitharu/kotatsu/core/network/RateLimitInterceptor.kt

@@ -4,15 +4,11 @@ import okhttp3.Interceptor
 import okhttp3.Response
 import okhttp3.internal.closeQuietly
 import org.koitharu.kotatsu.core.exceptions.TooManyRequestExceptions
-import java.text.SimpleDateFormat
+import java.time.Instant
-import java.util.Date
+import java.time.ZonedDateTime
-import java.util.Locale
+import java.time.format.DateTimeFormatter
-import java.util.concurrent.TimeUnit
 
 class RateLimitInterceptor : Interceptor {
-
-	private val dateFormat = SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss ZZZ", Locale.ENGLISH)
-
 	override fun intercept(chain: Interceptor.Chain): Response {
 		val response = chain.proceed(chain.request())
 		if (response.code == 429) {
@@ -27,10 +23,8 @@ class RateLimitInterceptor : Interceptor {
 		return response
 	}
 
-	private fun String.parseRetryDate(): Date? {
+	private fun String.parseRetryDate(): Instant? {
-		toIntOrNull()?.let {
+		return toLongOrNull()?.let { Instant.now().plusSeconds(it) }
-			return Date(System.currentTimeMillis() + TimeUnit.SECONDS.toMillis(it.toLong()))
+			?: ZonedDateTime.parse(this, DateTimeFormatter.RFC_1123_DATE_TIME).toInstant()
-		}
-		return dateFormat.parse(this)
 	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/core/os/AppValidator.kt

@@ -1,16 +1,9 @@
 package org.koitharu.kotatsu.core.os
 
-import android.annotation.SuppressLint
 import android.content.Context
 import android.content.pm.PackageManager
+import androidx.core.content.pm.PackageInfoCompat
 import dagger.hilt.android.qualifiers.ApplicationContext
-import org.koitharu.kotatsu.core.util.ext.printStackTraceDebug
-import org.koitharu.kotatsu.parsers.util.byte2HexFormatted
-import java.io.ByteArrayInputStream
-import java.io.InputStream
-import java.security.MessageDigest
-import java.security.cert.CertificateFactory
-import java.security.cert.X509Certificate
 import javax.inject.Inject
 import javax.inject.Singleton
 
@@ -18,29 +11,13 @@ import javax.inject.Singleton
 class AppValidator @Inject constructor(
 	@ApplicationContext private val context: Context,
 ) {
-
+	@Suppress("NewApi")
 	val isOriginalApp by lazy {
-		getCertificateSHA1Fingerprint() == CERT_SHA1
+		val certificates = mapOf(CERT_SHA256.hexToByteArray() to PackageManager.CERT_INPUT_SHA256)
+		PackageInfoCompat.hasSignatures(context.packageManager, context.packageName, certificates, false)
 	}
 
-	@Suppress("DEPRECATION")
-	@SuppressLint("PackageManagerGetSignatures")
-	private fun getCertificateSHA1Fingerprint(): String? = runCatching {
-		val packageInfo = context.packageManager.getPackageInfo(context.packageName, PackageManager.GET_SIGNATURES)
-		val signatures = requireNotNull(packageInfo?.signatures)
-		val cert: ByteArray = signatures.first().toByteArray()
-		val input: InputStream = ByteArrayInputStream(cert)
-		val cf = CertificateFactory.getInstance("X509")
-		val c = cf.generateCertificate(input) as X509Certificate
-		val md: MessageDigest = MessageDigest.getInstance("SHA1")
-		val publicKey: ByteArray = md.digest(c.encoded)
-		return publicKey.byte2HexFormatted()
-	}.onFailure { error ->
-		error.printStackTraceDebug()
-	}.getOrNull()
-
 	private companion object {
-
+		private const val CERT_SHA256 = "67e15100bb809301783edcb6348fa3bbf83034d91e62868a91053dbd70db3f18"
-		private const val CERT_SHA1 = "2C:19:C7:E8:07:61:2B:8E:94:51:1B:FD:72:67:07:64:5D:C2:58:AE"
 	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/core/parser/MangaDataRepository.kt

@@ -1,5 +1,6 @@
 package org.koitharu.kotatsu.core.parser
 
+import androidx.core.net.toUri
 import androidx.room.withTransaction
 import dagger.Reusable
 import kotlinx.coroutines.flow.Flow
@@ -13,6 +14,7 @@ import org.koitharu.kotatsu.core.db.entity.toManga
 import org.koitharu.kotatsu.core.db.entity.toMangaTags
 import org.koitharu.kotatsu.core.model.isLocal
 import org.koitharu.kotatsu.core.prefs.ReaderMode
+import org.koitharu.kotatsu.core.util.ext.toFileOrNull
 import org.koitharu.kotatsu.parsers.model.Manga
 import org.koitharu.kotatsu.parsers.model.MangaSource
 import org.koitharu.kotatsu.parsers.model.MangaTag
@@ -97,9 +99,18 @@ class MangaDataRepository @Inject constructor(
 		return db.getTagsDao().findTags(source.name).toMangaTags()
 	}
 
+	suspend fun cleanupLocalManga() {
+		val dao = db.getMangaDao()
+		val broken = dao.findAllBySource(MangaSource.LOCAL.name)
+			.filter { x -> x.manga.url.toUri().toFileOrNull()?.exists() == false }
+		if (broken.isNotEmpty()) {
+			dao.delete(broken.map { it.manga })
+		}
+	}
+
 	private fun MangaPrefsEntity.getColorFilterOrNull(): ReaderColorFilter? {
-		return if (cfBrightness != 0f || cfContrast != 0f || cfInvert) {
+		return if (cfBrightness != 0f || cfContrast != 0f || cfInvert || cfGrayscale) {
-			ReaderColorFilter(cfBrightness, cfContrast, cfInvert)
+			ReaderColorFilter(cfBrightness, cfContrast, cfInvert, cfGrayscale)
 		} else {
 			null
 		}
@@ -111,5 +122,6 @@ class MangaDataRepository @Inject constructor(
 		cfBrightness = 0f,
 		cfContrast = 0f,
 		cfInvert = false,
+		cfGrayscale = false,
 	)
 }

app/src/main/kotlin/org/koitharu/kotatsu/core/parser/MangaLinkResolver.kt

@@ -1,6 +1,7 @@
 package org.koitharu.kotatsu.core.parser
 
 import android.net.Uri
+import coil.request.CachePolicy
 import dagger.Reusable
 import org.koitharu.kotatsu.core.model.MangaSource
 import org.koitharu.kotatsu.core.util.ext.ifNullOrEmpty
@@ -85,7 +86,7 @@ class MangaLinkResolver @Inject constructor(
 
 	private suspend fun MangaRepository.getDetailsNoCache(manga: Manga): Manga {
 		return if (this is RemoteMangaRepository) {
-			getDetails(manga, withCache = false)
+			getDetails(manga, CachePolicy.READ_ONLY)
 		} else {
 			getDetails(manga)
 		}

app/src/main/kotlin/org/koitharu/kotatsu/core/parser/MangaRepository.kt

@@ -5,6 +5,7 @@ import org.koitharu.kotatsu.core.cache.ContentCache
 import org.koitharu.kotatsu.core.network.MirrorSwitchInterceptor
 import org.koitharu.kotatsu.local.data.LocalMangaRepository
 import org.koitharu.kotatsu.parsers.MangaLoaderContext
+import org.koitharu.kotatsu.parsers.model.ContentRating
 import org.koitharu.kotatsu.parsers.model.Manga
 import org.koitharu.kotatsu.parsers.model.MangaChapter
 import org.koitharu.kotatsu.parsers.model.MangaListFilter
@@ -15,6 +16,7 @@ import org.koitharu.kotatsu.parsers.model.MangaTag
 import org.koitharu.kotatsu.parsers.model.SortOrder
 import java.lang.ref.WeakReference
 import java.util.EnumMap
+import java.util.Locale
 import javax.inject.Inject
 import javax.inject.Singleton
 import kotlin.collections.set
@@ -27,10 +29,16 @@ interface MangaRepository {
 
 	val states: Set<MangaState>
 
+	val contentRatings: Set<ContentRating>
+
 	var defaultSortOrder: SortOrder
 
 	val isMultipleTagsSupported: Boolean
 
+	val isTagsExclusionSupported: Boolean
+
+	val isSearchSupported: Boolean
+
 	suspend fun getList(offset: Int, filter: MangaListFilter?): List<Manga>
 
 	suspend fun getDetails(manga: Manga): Manga
@@ -41,6 +49,8 @@ interface MangaRepository {
 
 	suspend fun getTags(): Set<MangaTag>
 
+	suspend fun getLocales(): Set<Locale>
+
 	suspend fun getRelated(seed: Manga): List<Manga>
 
 	@Singleton

app/src/main/kotlin/org/koitharu/kotatsu/core/parser/RemoteMangaRepository.kt

@@ -1,6 +1,8 @@
 package org.koitharu.kotatsu.core.parser
 
 import android.util.Log
+import androidx.collection.MutableLongSet
+import coil.request.CachePolicy
 import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
@@ -20,6 +22,7 @@ import org.koitharu.kotatsu.parsers.MangaParser
 import org.koitharu.kotatsu.parsers.MangaParserAuthProvider
 import org.koitharu.kotatsu.parsers.config.ConfigKey
 import org.koitharu.kotatsu.parsers.exception.ParseException
+import org.koitharu.kotatsu.parsers.model.ContentRating
 import org.koitharu.kotatsu.parsers.model.Favicons
 import org.koitharu.kotatsu.parsers.model.Manga
 import org.koitharu.kotatsu.parsers.model.MangaChapter
@@ -31,6 +34,7 @@ import org.koitharu.kotatsu.parsers.model.MangaTag
 import org.koitharu.kotatsu.parsers.model.SortOrder
 import org.koitharu.kotatsu.parsers.util.domain
 import org.koitharu.kotatsu.parsers.util.runCatchingCancellable
+import java.util.Locale
 
 class RemoteMangaRepository(
 	private val parser: MangaParser,
@@ -47,6 +51,9 @@ class RemoteMangaRepository(
 	override val states: Set<MangaState>
 		get() = parser.availableStates
 
+	override val contentRatings: Set<ContentRating>
+		get() = parser.availableContentRating
+
 	override var defaultSortOrder: SortOrder
 		get() = getConfig().defaultSortOrder ?: sortOrders.first()
 		set(value) {
@@ -56,6 +63,12 @@ class RemoteMangaRepository(
 	override val isMultipleTagsSupported: Boolean
 		get() = parser.isMultipleTagsSupported
 
+	override val isSearchSupported: Boolean
+		get() = parser.isSearchSupported
+
+	override val isTagsExclusionSupported: Boolean
+		get() = parser.isTagsExclusionSupported
+
 	var domain: String
 		get() = parser.domain
 		set(value) {
@@ -82,7 +95,7 @@ class RemoteMangaRepository(
 		}
 	}
 
-	override suspend fun getDetails(manga: Manga): Manga = getDetails(manga, withCache = true)
+	override suspend fun getDetails(manga: Manga): Manga = getDetails(manga, CachePolicy.ENABLED)
 
 	override suspend fun getPages(chapter: MangaChapter): List<MangaPage> {
 		cache.getPages(source, chapter.url)?.let { return it }
@@ -103,6 +116,10 @@ class RemoteMangaRepository(
 		parser.getAvailableTags()
 	}
 
+	override suspend fun getLocales(): Set<Locale> {
+		return parser.getAvailableLocales()
+	}
+
 	suspend fun getFavicons(): Favicons = mirrorSwitchInterceptor.withMirrorSwitching {
 		parser.getFavicons()
 	}
@@ -116,17 +133,18 @@ class RemoteMangaRepository(
 		return related.await()
 	}
 
-	suspend fun getDetails(manga: Manga, withCache: Boolean): Manga {
+	suspend fun getDetails(manga: Manga, cachePolicy: CachePolicy): Manga {
-		if (!withCache) {
+		if (cachePolicy.readEnabled) {
-			return parser.getDetails(manga)
+			cache.getDetails(source, manga.url)?.let { return it }
 		}
-		cache.getDetails(source, manga.url)?.let { return it }
 		val details = asyncSafe {
 			mirrorSwitchInterceptor.withMirrorSwitching {
 				parser.getDetails(manga)
 			}
 		}
-		cache.putDetails(source, manga.url, details)
+		if (cachePolicy.writeEnabled) {
+			cache.putDetails(source, manga.url, details)
+		}
 		return details.await()
 	}
 
@@ -149,6 +167,10 @@ class RemoteMangaRepository(
 		return parser.configKeyDomain.presetValues.toList()
 	}
 
+	fun isSlowdownEnabled(): Boolean {
+		return getConfig().isSlowdownEnabled
+	}
+
 	private fun getConfig() = parser.config as SourceSettings
 
 	private suspend fun <T> asyncSafe(block: suspend CoroutineScope.() -> T): SafeDeferred<T> {
@@ -168,7 +190,7 @@ class RemoteMangaRepository(
 			return emptyList()
 		}
 		val result = ArrayList<MangaPage>(size)
-		val set = HashSet<Long>(size)
+		val set = MutableLongSet(size)
 		for (page in this) {
 			if (set.add(page.id)) {
 				result.add(page)

app/src/main/kotlin/org/koitharu/kotatsu/core/prefs/AppSettings.kt

@@ -28,6 +28,7 @@ import org.koitharu.kotatsu.parsers.model.SortOrder
 import org.koitharu.kotatsu.parsers.util.find
 import org.koitharu.kotatsu.parsers.util.mapNotNullToSet
 import org.koitharu.kotatsu.parsers.util.mapToSet
+import org.koitharu.kotatsu.reader.domain.ReaderColorFilter
 import java.io.File
 import java.net.Proxy
 import java.util.Locale
@@ -100,14 +101,18 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 			}
 		}
 
-	val readerPageSwitch: Set<String>
+	var isReaderDoubleOnLandscape: Boolean
-		get() = prefs.getStringSet(KEY_READER_SWITCHERS, null) ?: setOf(PAGE_SWITCH_TAPS)
+		get() = prefs.getBoolean(KEY_READER_DOUBLE_PAGES, false)
+		set(value) = prefs.edit { putBoolean(KEY_READER_DOUBLE_PAGES, value) }
+
+	val isReaderVolumeButtonsEnabled: Boolean
+		get() = prefs.getBoolean(KEY_READER_VOLUME_BUTTONS, false)
 
 	val isReaderZoomButtonsEnabled: Boolean
 		get() = prefs.getBoolean(KEY_READER_ZOOM_BUTTONS, false)
 
-	val isReaderTapsAdaptive: Boolean
+	val isReaderFullscreenEnabled: Boolean
-		get() = !prefs.getBoolean(KEY_READER_TAPS_LTR, false)
+		get() = prefs.getBoolean(KEY_READER_FULLSCREEN, true)
 
 	val isReaderOptimizationEnabled: Boolean
 		get() = prefs.getBoolean(KEY_READER_OPTIMIZE, false)
@@ -203,6 +208,9 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 	val isUnstableUpdatesAllowed: Boolean
 		get() = prefs.getBoolean(KEY_UPDATES_UNSTABLE, false)
 
+	val defaultDetailsTab: Int
+		get() = prefs.getString(KEY_DETAILS_TAB, null)?.toIntOrNull()?.coerceIn(0, 1) ?: 0
+
 	val isContentPrefetchEnabled: Boolean
 		get() {
 			if (isBackgroundNetworkRestricted()) {
@@ -259,9 +267,6 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 			}
 		}
 
-	val isDownloadsSlowdownEnabled: Boolean
-		get() = prefs.getBoolean(KEY_DOWNLOADS_SLOWDOWN, false)
-
 	val isDownloadsWiFiOnly: Boolean
 		get() = prefs.getBoolean(KEY_DOWNLOADS_WIFI, false)
 
@@ -296,6 +301,24 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 	val isReaderKeepScreenOn: Boolean
 		get() = prefs.getBoolean(KEY_READER_SCREEN_ON, true)
 
+	var readerColorFilter: ReaderColorFilter?
+		get() = runCatching {
+			val brightness = prefs.getFloat(KEY_CF_BRIGHTNESS, ReaderColorFilter.EMPTY.brightness)
+			val contrast = prefs.getFloat(KEY_CF_CONTRAST, ReaderColorFilter.EMPTY.contrast)
+			val inverted = prefs.getBoolean(KEY_CF_INVERTED, ReaderColorFilter.EMPTY.isInverted)
+			val grayscale = prefs.getBoolean(KEY_CF_GRAYSCALE, ReaderColorFilter.EMPTY.isGrayscale)
+			ReaderColorFilter(brightness, contrast, inverted, grayscale).takeUnless { it.isEmpty }
+		}.getOrNull()
+		set(value) {
+			prefs.edit {
+				val cf = value ?: ReaderColorFilter.EMPTY
+				putFloat(KEY_CF_BRIGHTNESS, cf.brightness)
+				putFloat(KEY_CF_CONTRAST, cf.contrast)
+				putBoolean(KEY_CF_INVERTED, cf.isInverted)
+				putBoolean(KEY_CF_GRAYSCALE, cf.isGrayscale)
+			}
+		}
+
 	val isImagesProxyEnabled: Boolean
 		get() = prefs.getBoolean(KEY_IMAGES_PROXY, false)
 
@@ -328,15 +351,23 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 		set(value) = prefs.edit { putEnumValue(KEY_LOCAL_LIST_ORDER, value) }
 
 	var historySortOrder: ListSortOrder
-		get() = prefs.getEnumValue(KEY_HISTORY_ORDER, ListSortOrder.UPDATED)
+		get() = prefs.getEnumValue(KEY_HISTORY_ORDER, ListSortOrder.LAST_READ)
 		set(value) = prefs.edit { putEnumValue(KEY_HISTORY_ORDER, value) }
 
+	var allFavoritesSortOrder: ListSortOrder
+		get() = prefs.getEnumValue(KEY_FAVORITES_ORDER, ListSortOrder.NEWEST)
+		set(value) = prefs.edit { putEnumValue(KEY_FAVORITES_ORDER, value) }
+
 	val isRelatedMangaEnabled: Boolean
 		get() = prefs.getBoolean(KEY_RELATED_MANGA, true)
 
 	val isWebtoonZoomEnable: Boolean
 		get() = prefs.getBoolean(KEY_WEBTOON_ZOOM, true)
 
+	@get:FloatRange(from = 0.0, to = 0.5)
+	val defaultWebtoonZoomOut: Float
+		get() = prefs.getInt(KEY_WEBTOON_ZOOM_OUT, 0).coerceIn(0, 50) / 100f
+
 	@get:FloatRange(from = 0.0, to = 1.0)
 	var readerAutoscrollSpeed: Float
 		get() = prefs.getFloat(KEY_READER_AUTOSCROLL_SPEED, 0f)
@@ -372,6 +403,9 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 		get() = prefs.getString(KEY_BACKUP_PERIODICAL_OUTPUT, null)?.toUriOrNull()
 		set(value) = prefs.edit { putString(KEY_BACKUP_PERIODICAL_OUTPUT, value?.toString()) }
 
+	val isReadingTimeEstimationEnabled: Boolean
+		get() = prefs.getBoolean(KEY_READING_TIME, true)
+
 	fun isTipEnabled(tip: String): Boolean {
 		return prefs.getStringSet(KEY_TIPS_CLOSED, emptySet())?.contains(tip) != true
 	}
@@ -430,7 +464,6 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 
 	companion object {
 
-		const val PAGE_SWITCH_TAPS = "taps"
 		const val PAGE_SWITCH_VOLUME_KEYS = "volume"
 
 		const val TRACK_HISTORY = "history"
@@ -453,8 +486,10 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 		const val KEY_GRID_SIZE = "grid_size"
 		const val KEY_REMOTE_SOURCES = "remote_sources"
 		const val KEY_LOCAL_STORAGE = "local_storage"
-		const val KEY_READER_SWITCHERS = "reader_switchers"
+		const val KEY_READER_DOUBLE_PAGES = "reader_double_pages"
 		const val KEY_READER_ZOOM_BUTTONS = "reader_zoom_buttons"
+		const val KEY_READER_FULLSCREEN = "reader_fullscreen"
+		const val KEY_READER_VOLUME_BUTTONS = "reader_volume_buttons"
 		const val KEY_TRACKER_ENABLED = "tracker_enabled"
 		const val KEY_TRACKER_WIFI_ONLY = "tracker_wifi"
 		const val KEY_TRACK_SOURCES = "track_sources"
@@ -495,7 +530,7 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 		const val KEY_SHIKIMORI = "shikimori"
 		const val KEY_ANILIST = "anilist"
 		const val KEY_MAL = "mal"
-		const val KEY_DOWNLOADS_SLOWDOWN = "downloads_slowdown"
+		const val KEY_KITSU = "kitsu"
 		const val KEY_DOWNLOADS_WIFI = "downloads_wifi"
 		const val KEY_ALL_FAVOURITES_VISIBLE = "all_favourites_visible"
 		const val KEY_DOH = "doh"
@@ -508,11 +543,13 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 		const val KEY_READER_BACKGROUND = "reader_background"
 		const val KEY_READER_SCREEN_ON = "reader_screen_on"
 		const val KEY_SHORTCUTS = "dynamic_shortcuts"
-		const val KEY_READER_TAPS_LTR = "reader_taps_ltr"
+		const val KEY_READER_TAP_ACTIONS = "reader_tap_actions"
 		const val KEY_READER_OPTIMIZE = "reader_optimize"
 		const val KEY_LOCAL_LIST_ORDER = "local_order"
 		const val KEY_HISTORY_ORDER = "history_order"
+		const val KEY_FAVORITES_ORDER = "fav_order"
 		const val KEY_WEBTOON_ZOOM = "webtoon_zoom"
+		const val KEY_WEBTOON_ZOOM_OUT = "webtoon_zoom_out"
 		const val KEY_PREFETCH_CONTENT = "prefetch_content"
 		const val KEY_APP_LOCALE = "app_locale"
 		const val KEY_LOGGING_ENABLED = "logging"
@@ -539,6 +576,13 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 		const val KEY_32BIT_COLOR = "enhanced_colors"
 		const val KEY_SOURCES_ORDER = "sources_sort_order"
 		const val KEY_SOURCES_CATALOG = "sources_catalog"
+		const val KEY_CF_BRIGHTNESS = "cf_brightness"
+		const val KEY_CF_CONTRAST = "cf_contrast"
+		const val KEY_CF_INVERTED = "cf_inverted"
+		const val KEY_CF_GRAYSCALE = "cf_grayscale"
+		const val KEY_IGNORE_DOZE = "ignore_dose"
+		const val KEY_DETAILS_TAB = "details_tab"
+		const val KEY_READING_TIME = "reading_time"
 
 		// About
 		const val KEY_APP_UPDATE = "app_update"

app/src/main/kotlin/org/koitharu/kotatsu/core/prefs/NavItem.kt

@@ -4,13 +4,12 @@ import androidx.annotation.DrawableRes
 import androidx.annotation.IdRes
 import androidx.annotation.StringRes
 import org.koitharu.kotatsu.R
-import org.koitharu.kotatsu.list.ui.model.ListModel
 
 enum class NavItem(
 	@IdRes val id: Int,
 	@StringRes val title: Int,
 	@DrawableRes val icon: Int,
-) : ListModel {
+) {
 
 	HISTORY(R.id.nav_history, R.string.history, R.drawable.ic_history_selector),
 	FAVORITES(R.id.nav_favorites, R.string.favourites, R.drawable.ic_favourites_selector),
@@ -21,10 +20,6 @@ enum class NavItem(
 	BOOKMARKS(R.id.nav_bookmarks, R.string.bookmarks, R.drawable.ic_bookmark_selector),
 	;
 
-	override fun areItemsTheSame(other: ListModel): Boolean {
-		return other is NavItem && ordinal == other.ordinal
-	}
-
 	fun isAvailable(settings: AppSettings): Boolean = when (this) {
 		SUGGESTIONS -> settings.isSuggestionsEnabled
 		FEED -> settings.isTrackerEnabled

app/src/main/kotlin/org/koitharu/kotatsu/core/prefs/ReaderMode.kt

@@ -4,7 +4,9 @@ enum class ReaderMode(val id: Int) {
 
 	STANDARD(1),
 	REVERSED(3),
-	WEBTOON(2);
+	VERTICAL(4),
+	WEBTOON(2),
+	;
 
 	companion object {
 

app/src/main/kotlin/org/koitharu/kotatsu/core/prefs/SourceSettings.kt

@@ -11,6 +11,7 @@ import org.koitharu.kotatsu.parsers.model.MangaSource
 import org.koitharu.kotatsu.parsers.model.SortOrder
 
 private const val KEY_SORT_ORDER = "sort_order"
+private const val KEY_SLOWDOWN = "slowdown"
 
 class SourceSettings(context: Context, source: MangaSource) : MangaSourceConfig {
 
@@ -20,6 +21,9 @@ class SourceSettings(context: Context, source: MangaSource) : MangaSourceConfig
 		get() = prefs.getEnumValue(KEY_SORT_ORDER, SortOrder::class.java)
 		set(value) = prefs.edit { putEnumValue(KEY_SORT_ORDER, value) }
 
+	val isSlowdownEnabled: Boolean
+		get() = prefs.getBoolean(KEY_SLOWDOWN, false)
+
 	@Suppress("UNCHECKED_CAST")
 	override fun <T> get(key: ConfigKey<T>): T {
 		return when (key) {

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/BaseFullscreenActivity.kt

@@ -29,7 +29,6 @@ abstract class BaseFullscreenActivity<B : ViewBinding> :
 					WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES
 			}
 		}
-		// insetsControllerCompat.systemBarsBehavior = WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
 		systemUiController.setSystemUiVisible(true)
 	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/BaseListAdapter.kt

@@ -10,6 +10,7 @@ import kotlinx.coroutines.flow.FlowCollector
 import org.koitharu.kotatsu.core.util.ContinuationResumeRunnable
 import org.koitharu.kotatsu.list.ui.ListModelDiffCallback
 import org.koitharu.kotatsu.list.ui.adapter.ListItemType
+import org.koitharu.kotatsu.list.ui.model.ListHeader
 import org.koitharu.kotatsu.list.ui.model.ListModel
 import kotlin.coroutines.suspendCoroutine
 
@@ -35,4 +36,15 @@ open class BaseListAdapter<T : ListModel> : AsyncListDifferDelegationAdapter<T>(
 	fun removeListListener(listListener: ListListener<T>) {
 		differ.removeListListener(listListener)
 	}
+
+	fun findHeader(position: Int): ListHeader? {
+		val snapshot = items
+		for (i in (0..position).reversed()) {
+			val item = snapshot.getOrNull(i) ?: continue
+			if (item is ListHeader) {
+				return item
+			}
+		}
+		return null
+	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/BasePreferenceFragment.kt

@@ -1,5 +1,7 @@
 package org.koitharu.kotatsu.core.ui
 
+import android.content.ActivityNotFoundException
+import android.content.Intent
 import android.os.Bundle
 import android.view.View
 import androidx.annotation.CallSuper
@@ -8,7 +10,9 @@ import androidx.core.graphics.Insets
 import androidx.core.view.updatePadding
 import androidx.preference.PreferenceFragmentCompat
 import androidx.recyclerview.widget.RecyclerView
+import com.google.android.material.snackbar.Snackbar
 import dagger.hilt.android.AndroidEntryPoint
+import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.ui.util.RecyclerViewOwner
 import org.koitharu.kotatsu.core.ui.util.WindowInsetsDelegate
@@ -62,4 +66,12 @@ abstract class BasePreferenceFragment(@StringRes private val titleId: Int) :
 	protected fun setTitle(title: CharSequence?) {
 		(activity as? SettingsActivity)?.setSectionTitle(title)
 	}
+
+	protected fun startActivitySafe(intent: Intent) {
+		try {
+			startActivity(intent)
+		} catch (_: ActivityNotFoundException) {
+			Snackbar.make(listView, R.string.operation_not_supported, Snackbar.LENGTH_SHORT).show()
+		}
+	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/ReorderableListAdapter.kt

@@ -0,0 +1,75 @@
+package org.koitharu.kotatsu.core.ui
+
+import androidx.recyclerview.widget.AsyncListDiffer.ListListener
+import androidx.recyclerview.widget.DiffUtil
+import com.hannesdorfmann.adapterdelegates4.AdapterDelegate
+import com.hannesdorfmann.adapterdelegates4.ListDelegationAdapter
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.FlowCollector
+import kotlinx.coroutines.withContext
+import org.koitharu.kotatsu.list.ui.adapter.ListItemType
+import org.koitharu.kotatsu.list.ui.model.ListModel
+import java.util.Collections
+import java.util.LinkedList
+
+open class ReorderableListAdapter<T : ListModel> : ListDelegationAdapter<List<T>>(), FlowCollector<List<T>?> {
+
+	private val listListeners = LinkedList<ListListener<T>>()
+
+	override suspend fun emit(value: List<T>?) {
+		val oldList = items.orEmpty()
+		val newList = value.orEmpty()
+		val diffResult = withContext(Dispatchers.Default) {
+			val diffCallback = DiffCallback(oldList, newList)
+			DiffUtil.calculateDiff(diffCallback)
+		}
+		super.setItems(newList)
+		diffResult.dispatchUpdatesTo(this)
+		listListeners.forEach { it.onCurrentListChanged(oldList, newList) }
+	}
+
+	@Deprecated("Use emit() to dispatch list updates", level = DeprecationLevel.ERROR)
+	override fun setItems(items: List<T>?) {
+		super.setItems(items)
+	}
+
+	fun reorderItems(oldPos: Int, newPos: Int) {
+		Collections.swap(items ?: return, oldPos, newPos)
+		notifyItemMoved(oldPos, newPos)
+	}
+
+	fun addDelegate(type: ListItemType, delegate: AdapterDelegate<List<T>>): ReorderableListAdapter<T> {
+		delegatesManager.addDelegate(type.ordinal, delegate)
+		return this
+	}
+
+	fun addListListener(listListener: ListListener<T>) {
+		listListeners.add(listListener)
+	}
+
+	fun removeListListener(listListener: ListListener<T>) {
+		listListeners.remove(listListener)
+	}
+
+	protected class DiffCallback<T : ListModel>(
+		val oldList: List<T>,
+		val newList: List<T>,
+	) : DiffUtil.Callback() {
+
+		override fun getOldListSize(): Int = oldList.size
+
+		override fun getNewListSize(): Int = newList.size
+
+		override fun areItemsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
+			val oldItem = oldList[oldItemPosition]
+			val newItem = newList[newItemPosition]
+			return newItem.areItemsTheSame(oldItem)
+		}
+
+		override fun areContentsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
+			val oldItem = oldList[oldItemPosition]
+			val newItem = newList[newItemPosition]
+			return newItem == oldItem
+		}
+	}
+}

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/drawable/TextDrawable.kt

@@ -1,100 +0,0 @@
-package org.koitharu.kotatsu.core.ui.drawable
-
-import android.annotation.SuppressLint
-import android.content.Context
-import android.graphics.Canvas
-import android.graphics.Color
-import android.graphics.ColorFilter
-import android.graphics.Paint
-import android.graphics.PixelFormat
-import android.graphics.Typeface
-import android.graphics.drawable.Drawable
-import android.os.Build
-import android.text.Layout
-import android.text.StaticLayout
-import android.text.TextPaint
-import androidx.annotation.ColorInt
-import androidx.annotation.Px
-import androidx.annotation.StyleRes
-import androidx.core.graphics.withTranslation
-import com.google.android.material.resources.TextAppearance
-import com.google.android.material.resources.TextAppearanceFontCallback
-import org.koitharu.kotatsu.core.util.ext.getThemeColor
-
-class TextDrawable(
-	val text: CharSequence,
-) : Drawable() {
-
-	private val paint = TextPaint(Paint.ANTI_ALIAS_FLAG)
-	private var cachedLayout: StaticLayout? = null
-
-	@SuppressLint("RestrictedApi")
-	constructor(context: Context, text: CharSequence, @StyleRes textAppearanceId: Int) : this(text) {
-		val ta = TextAppearance(context, textAppearanceId)
-		paint.color = ta.textColor?.defaultColor ?: context.getThemeColor(android.R.attr.textColorPrimary, Color.BLACK)
-		paint.typeface = ta.fallbackFont
-		ta.getFontAsync(
-			context, paint,
-			object : TextAppearanceFontCallback() {
-				override fun onFontRetrieved(typeface: Typeface?, fontResolvedSynchronously: Boolean) = Unit
-				override fun onFontRetrievalFailed(reason: Int) = Unit
-			},
-		)
-		paint.letterSpacing = ta.letterSpacing
-	}
-
-	var alignment = Layout.Alignment.ALIGN_NORMAL
-
-	var lineSpacingMultiplier = 1f
-
-	@Px
-	var lineSpacingExtra = 0f
-
-	@get:ColorInt
-	var textColor: Int
-		get() = paint.color
-		set(@ColorInt value) {
-			paint.color = value
-		}
-
-	override fun draw(canvas: Canvas) {
-		val b = bounds
-		if (b.isEmpty) {
-			return
-		}
-		canvas.withTranslation(x = b.left.toFloat(), y = b.top.toFloat()) {
-			obtainLayout().draw(canvas)
-		}
-	}
-
-	override fun setAlpha(alpha: Int) {
-		paint.alpha = alpha
-	}
-
-	override fun setColorFilter(colorFilter: ColorFilter?) {
-		paint.setColorFilter(colorFilter)
-	}
-
-	@Suppress("DeprecatedCallableAddReplaceWith")
-	@Deprecated("Deprecated in Java")
-	override fun getOpacity(): Int = PixelFormat.TRANSLUCENT
-
-	private fun obtainLayout(): StaticLayout {
-		val width = bounds.width()
-		cachedLayout?.let {
-			if (it.width == width) {
-				return it
-			}
-		}
-		return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
-			StaticLayout.Builder.obtain(text, 0, text.length, paint, width)
-				.setAlignment(alignment)
-				.setLineSpacing(lineSpacingExtra, lineSpacingMultiplier)
-				.setIncludePad(true)
-				.build()
-		} else {
-			@Suppress("DEPRECATION")
-			StaticLayout(text, paint, width, alignment, lineSpacingMultiplier, lineSpacingExtra, true)
-		}.also { cachedLayout = it }
-	}
-}

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/list/BoundsScrollListener.kt

@@ -38,4 +38,12 @@ abstract class BoundsScrollListener(
 		firstVisibleItemPosition: Int,
 		visibleItemCount: Int
 	) = Unit
+
+	fun invalidate(recyclerView: RecyclerView) {
+		onScrolled(recyclerView, 0, 0)
+	}
+
+	fun postInvalidate(recyclerView: RecyclerView) = recyclerView.post {
+		invalidate(recyclerView)
+	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/list/NestedScrollStateHandle.kt

@@ -1,64 +0,0 @@
-package org.koitharu.kotatsu.core.ui.list
-
-import android.os.Bundle
-import android.os.Parcelable
-import android.util.SparseArray
-import androidx.core.os.BundleCompat
-import androidx.core.view.doOnNextLayout
-import androidx.recyclerview.widget.RecyclerView
-import java.util.Collections
-import java.util.WeakHashMap
-
-class NestedScrollStateHandle(
-	savedInstanceState: Bundle?,
-	private val key: String,
-) {
-
-	private val storage: SparseArray<Parcelable?> = savedInstanceState?.let {
-		BundleCompat.getSparseParcelableArray(it, key, Parcelable::class.java)
-	} ?: SparseArray<Parcelable?>()
-	private val controllers = Collections.newSetFromMap<Controller>(WeakHashMap())
-
-	fun attach(recycler: RecyclerView) = Controller(recycler).also(controllers::add)
-
-	fun onSaveInstanceState(outState: Bundle) {
-		controllers.forEach {
-			it.saveState()
-		}
-		outState.putSparseParcelableArray(key, storage)
-	}
-
-	inner class Controller(
-		private val recycler: RecyclerView
-	) {
-
-		private var lastPosition: Int = -1
-
-		fun onBind(position: Int) {
-			if (position != lastPosition) {
-				saveState()
-				lastPosition = position
-				storage[position]?.let {
-					restoreState(it)
-				}
-			}
-		}
-
-		fun onRecycled() {
-			saveState()
-			lastPosition = -1
-		}
-
-		fun saveState() {
-			if (lastPosition != -1) {
-				storage[lastPosition] = recycler.layoutManager?.onSaveInstanceState()
-			}
-		}
-
-		private fun restoreState(state: Parcelable) {
-			recycler.doOnNextLayout {
-				recycler.layoutManager?.onRestoreInstanceState(state)
-			}
-		}
-	}
-}

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/list/SectionedSelectionController.kt

@@ -1,237 +1,4 @@
 package org.koitharu.kotatsu.core.ui.list
 
-import android.app.Activity
-import android.os.Bundle
-import android.view.Menu
-import android.view.MenuItem
-import androidx.appcompat.app.AppCompatActivity
-import androidx.appcompat.view.ActionMode
-import androidx.collection.ArrayMap
-import androidx.lifecycle.Lifecycle
-import androidx.lifecycle.LifecycleEventObserver
-import androidx.lifecycle.LifecycleOwner
-import androidx.recyclerview.widget.RecyclerView
-import androidx.savedstate.SavedStateRegistry
-import androidx.savedstate.SavedStateRegistryOwner
-import kotlinx.coroutines.Dispatchers
-import org.koitharu.kotatsu.core.ui.list.decor.AbstractSelectionItemDecoration
-import kotlin.coroutines.EmptyCoroutineContext
-
 private const val PROVIDER_NAME = "selection_decoration_sectioned"
 
-class SectionedSelectionController<T : Any>(
-	private val activity: Activity,
-	private val owner: SavedStateRegistryOwner,
-	private val callback: Callback<T>,
-) : ActionMode.Callback, SavedStateRegistry.SavedStateProvider {
-
-	private var actionMode: ActionMode? = null
-
-	private var pendingData: MutableMap<String, Collection<Long>>? = null
-	private val decorations = ArrayMap<T, AbstractSelectionItemDecoration>()
-
-	val count: Int
-		get() = decorations.values.sumOf { it.checkedItemsCount }
-
-	init {
-		owner.lifecycle.addObserver(StateEventObserver())
-	}
-
-	fun snapshot(): Map<T, Set<Long>> {
-		return decorations.mapValues { it.value.checkedItemsIds.toSet() }
-	}
-
-	fun peekCheckedIds(): Map<T, Set<Long>> {
-		return decorations.mapValues { it.value.checkedItemsIds }
-	}
-
-	fun clear() {
-		decorations.values.forEach {
-			it.clearSelection()
-		}
-		notifySelectionChanged()
-	}
-
-	fun attachToRecyclerView(section: T, recyclerView: RecyclerView) {
-		val decoration = getDecoration(section)
-		val pendingIds = pendingData?.remove(section.toString())
-		if (!pendingIds.isNullOrEmpty()) {
-			decoration.checkAll(pendingIds)
-			startActionMode()
-			notifySelectionChanged()
-		}
-		var shouldAddDecoration = true
-		for (i in (0 until recyclerView.itemDecorationCount).reversed()) {
-			val decor = recyclerView.getItemDecorationAt(i)
-			if (decor === decoration) {
-				shouldAddDecoration = false
-				break
-			} else if (decor.javaClass == decoration.javaClass) {
-				recyclerView.removeItemDecorationAt(i)
-			}
-		}
-		if (shouldAddDecoration) {
-			recyclerView.addItemDecoration(decoration)
-		}
-		if (pendingData?.isEmpty() == true) {
-			pendingData = null
-		}
-	}
-
-	override fun saveState(): Bundle {
-		val bundle = Bundle(decorations.size)
-		for ((k, v) in decorations) {
-			bundle.putLongArray(k.toString(), v.checkedItemsIds.toLongArray())
-		}
-		return bundle
-	}
-
-	fun onItemClick(section: T, id: Long): Boolean {
-		val decoration = getDecoration(section)
-		if (isInSelectionMode()) {
-			decoration.toggleItemChecked(id)
-			if (isInSelectionMode()) {
-				actionMode?.invalidate()
-			} else {
-				actionMode?.finish()
-			}
-			notifySelectionChanged()
-			return true
-		}
-		return false
-	}
-
-	fun onItemLongClick(section: T, id: Long): Boolean {
-		val decoration = getDecoration(section)
-		startActionMode()
-		return actionMode?.also {
-			decoration.setItemIsChecked(id, true)
-			notifySelectionChanged()
-		} != null
-	}
-
-	fun getSectionCount(section: T): Int {
-		return decorations[section]?.checkedItemsCount ?: 0
-	}
-
-	fun addToSelection(section: T, ids: Collection<Long>): Boolean {
-		val decoration = getDecoration(section)
-		startActionMode()
-		return actionMode?.also {
-			decoration.checkAll(ids)
-			notifySelectionChanged()
-		} != null
-	}
-
-	fun clearSelection(section: T) {
-		decorations[section]?.clearSelection() ?: return
-		notifySelectionChanged()
-	}
-
-	override fun onCreateActionMode(mode: ActionMode, menu: Menu): Boolean {
-		return callback.onCreateActionMode(this, mode, menu)
-	}
-
-	override fun onPrepareActionMode(mode: ActionMode, menu: Menu): Boolean {
-		return callback.onPrepareActionMode(this, mode, menu)
-	}
-
-	override fun onActionItemClicked(mode: ActionMode, item: MenuItem): Boolean {
-		return callback.onActionItemClicked(this, mode, item)
-	}
-
-	override fun onDestroyActionMode(mode: ActionMode) {
-		callback.onDestroyActionMode(this, mode)
-		clear()
-		actionMode = null
-	}
-
-	private fun startActionMode() {
-		if (actionMode == null) {
-			actionMode = (activity as? AppCompatActivity)?.startSupportActionMode(this)
-		}
-	}
-
-	private fun isInSelectionMode(): Boolean {
-		return decorations.values.any { x -> x.checkedItemsCount > 0 }
-	}
-
-	private fun notifySelectionChanged() {
-		val count = this.count
-		callback.onSelectionChanged(this, count)
-		if (count == 0) {
-			actionMode?.finish()
-		} else {
-			actionMode?.invalidate()
-		}
-	}
-
-	private fun restoreState(ids: MutableMap<String, Collection<Long>>) {
-		if (ids.isEmpty() || isInSelectionMode()) {
-			return
-		}
-		for ((k, v) in decorations) {
-			val items = ids.remove(k.toString())
-			if (!items.isNullOrEmpty()) {
-				v.checkAll(items)
-			}
-		}
-		pendingData = ids
-		if (isInSelectionMode()) {
-			startActionMode()
-			notifySelectionChanged()
-		}
-	}
-
-	private fun getDecoration(section: T): AbstractSelectionItemDecoration {
-		return decorations.getOrPut(section) {
-			callback.onCreateItemDecoration(this, section)
-		}
-	}
-
-	interface Callback<T : Any> {
-
-		fun onSelectionChanged(controller: SectionedSelectionController<T>, count: Int)
-
-		fun onCreateActionMode(controller: SectionedSelectionController<T>, mode: ActionMode, menu: Menu): Boolean
-
-		fun onPrepareActionMode(controller: SectionedSelectionController<T>, mode: ActionMode, menu: Menu): Boolean {
-			mode.title = controller.count.toString()
-			return true
-		}
-
-		fun onDestroyActionMode(controller: SectionedSelectionController<T>, mode: ActionMode) = Unit
-
-		fun onActionItemClicked(
-			controller: SectionedSelectionController<T>,
-			mode: ActionMode,
-			item: MenuItem,
-		): Boolean
-
-		fun onCreateItemDecoration(
-			controller: SectionedSelectionController<T>,
-			section: T,
-		): AbstractSelectionItemDecoration
-	}
-
-	private inner class StateEventObserver : LifecycleEventObserver {
-
-		override fun onStateChanged(source: LifecycleOwner, event: Lifecycle.Event) {
-			if (event == Lifecycle.Event.ON_CREATE) {
-				val registry = owner.savedStateRegistry
-				registry.registerSavedStateProvider(PROVIDER_NAME, this@SectionedSelectionController)
-				val state = registry.consumeRestoredStateForKey(PROVIDER_NAME)
-				if (state != null) {
-					Dispatchers.Main.dispatch(EmptyCoroutineContext) { // == Handler.post
-						if (source.lifecycle.currentState.isAtLeast(Lifecycle.State.CREATED)) {
-							restoreState(
-								state.keySet()
-									.associateWithTo(HashMap()) { state.getLongArray(it)?.toList().orEmpty() },
-							)
-						}
-					}
-				}
-			}
-		}
-	}
-}

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/list/fastscroll/FastScrollRecyclerView.kt

@@ -4,8 +4,10 @@ import android.content.Context
 import android.util.AttributeSet
 import android.view.ViewGroup
 import androidx.annotation.AttrRes
+import androidx.core.view.ancestors
 import androidx.core.view.isVisible
 import androidx.recyclerview.widget.RecyclerView
+import androidx.viewpager2.widget.ViewPager2
 import org.koitharu.kotatsu.R
 
 class FastScrollRecyclerView @JvmOverloads constructor(
@@ -15,6 +17,16 @@ class FastScrollRecyclerView @JvmOverloads constructor(
 ) : RecyclerView(context, attrs, defStyleAttr) {
 
 	val fastScroller = FastScroller(context, attrs)
+	var isVP2BugWorkaroundEnabled = false
+		set(value) {
+			field = value
+			if (value && isAttachedToWindow) {
+				checkIfInVP2()
+			} else if (!value) {
+				applyVP2Workaround = false
+			}
+		}
+	private var applyVP2Workaround = false
 
 	var isFastScrollerEnabled: Boolean = true
 		set(value) {
@@ -43,10 +55,29 @@ class FastScrollRecyclerView @JvmOverloads constructor(
 	override fun onAttachedToWindow() {
 		super.onAttachedToWindow()
 		fastScroller.attachRecyclerView(this)
+		if (isVP2BugWorkaroundEnabled) {
+			checkIfInVP2()
+		}
 	}
 
 	override fun onDetachedFromWindow() {
 		fastScroller.detachRecyclerView()
 		super.onDetachedFromWindow()
+		applyVP2Workaround = false
+	}
+
+	override fun isLayoutRequested(): Boolean {
+		return if (applyVP2Workaround) false else super.isLayoutRequested()
+	}
+
+	override fun requestLayout() {
+		super.requestLayout()
+		if (applyVP2Workaround && parent?.isLayoutRequested == true) {
+			parent?.requestLayout()
+		}
+	}
+
+	private fun checkIfInVP2() {
+		applyVP2Workaround = ancestors.any { it is ViewPager2 } == true
 	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/list/fastscroll/FastScroller.kt

@@ -12,7 +12,12 @@ import android.view.MotionEvent
 import android.view.View
 import android.view.ViewGroup
 import android.widget.*
-import androidx.annotation.*
+import androidx.annotation.AttrRes
+import androidx.annotation.ColorInt
+import androidx.annotation.DimenRes
+import androidx.annotation.DrawableRes
+import androidx.annotation.Px
+import androidx.annotation.StyleableRes
 import androidx.constraintlayout.widget.ConstraintLayout
 import androidx.constraintlayout.widget.ConstraintSet
 import androidx.coordinatorlayout.widget.CoordinatorLayout
@@ -131,19 +136,19 @@ class FastScroller @JvmOverloads constructor(
 
 		var showTrack = false
 
-		context.withStyledAttributes(attrs, R.styleable.FastScroller, defStyleAttr) {
+		context.withStyledAttributes(attrs, R.styleable.FastScrollRecyclerView, defStyleAttr) {
-			bubbleColor = getColor(R.styleable.FastScroller_bubbleColor, bubbleColor)
+			bubbleColor = getColor(R.styleable.FastScrollRecyclerView_bubbleColor, bubbleColor)
-			handleColor = getColor(R.styleable.FastScroller_thumbColor, handleColor)
+			handleColor = getColor(R.styleable.FastScrollRecyclerView_thumbColor, handleColor)
-			trackColor = getColor(R.styleable.FastScroller_trackColor, trackColor)
+			trackColor = getColor(R.styleable.FastScrollRecyclerView_trackColor, trackColor)
-			textColor = getColor(R.styleable.FastScroller_bubbleTextColor, textColor)
+			textColor = getColor(R.styleable.FastScrollRecyclerView_bubbleTextColor, textColor)
-			hideScrollbar = getBoolean(R.styleable.FastScroller_hideScrollbar, hideScrollbar)
+			hideScrollbar = getBoolean(R.styleable.FastScrollRecyclerView_hideScrollbar, hideScrollbar)
-			showBubble = getBoolean(R.styleable.FastScroller_showBubble, showBubble)
+			showBubble = getBoolean(R.styleable.FastScrollRecyclerView_showBubble, showBubble)
-			showBubbleAlways = getBoolean(R.styleable.FastScroller_showBubbleAlways, showBubbleAlways)
+			showBubbleAlways = getBoolean(R.styleable.FastScrollRecyclerView_showBubbleAlways, showBubbleAlways)
-			showTrack = getBoolean(R.styleable.FastScroller_showTrack, showTrack)
+			showTrack = getBoolean(R.styleable.FastScrollRecyclerView_showTrack, showTrack)
-			bubbleSize = getBubbleSize(R.styleable.FastScroller_bubbleSize, BubbleSize.NORMAL)
+			bubbleSize = getBubbleSize(R.styleable.FastScrollRecyclerView_bubbleSize, BubbleSize.NORMAL)
-			val textSize = getDimension(R.styleable.FastScroller_bubbleTextSize, bubbleSize.textSize)
+			val textSize = getDimension(R.styleable.FastScrollRecyclerView_bubbleTextSize, bubbleSize.textSize)
 			binding.bubble.setTextSize(TypedValue.COMPLEX_UNIT_PX, textSize)
-			offset = getDimensionPixelOffset(R.styleable.FastScroller_scrollerOffset, offset)
+			offset = getDimensionPixelOffset(R.styleable.FastScrollRecyclerView_scrollerOffset, offset)
 		}
 
 		setTrackColor(trackColor)

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/model/DateTimeAgo.kt

@@ -2,9 +2,8 @@ package org.koitharu.kotatsu.core.ui.model
 
 import android.content.res.Resources
 import org.koitharu.kotatsu.R
-import org.koitharu.kotatsu.core.util.ext.daysDiff
+import java.time.LocalDate
-import org.koitharu.kotatsu.core.util.ext.format
+import java.time.format.DateTimeFormatter
-import java.util.Date
 
 sealed class DateTimeAgo {
 
@@ -74,28 +73,22 @@ sealed class DateTimeAgo {
 		}
 	}
 
-	class Absolute(private val date: Date) : DateTimeAgo() {
+	data class Absolute(private val date: LocalDate) : DateTimeAgo() {
-
-		private val day = date.daysDiff(0)
-
 		override fun format(resources: Resources): String {
-			return date.format("d MMMM")
+			return if (date == EPOCH_DATE) {
+				resources.getString(R.string.unknown)
+			} else {
+				date.format(formatter)
+			}
 		}
 
-		override fun equals(other: Any?): Boolean {
+		override fun toString() = "abs_${date.toEpochDay()}"
-			if (this === other) return true
-			if (javaClass != other?.javaClass) return false
 
-			other as Absolute
+		companion object {
-
+			// TODO: Use Java 9's LocalDate.EPOCH.
-			return day == other.day
+			private val EPOCH_DATE = LocalDate.of(1970, 1, 1)
+			private val formatter = DateTimeFormatter.ofPattern("d MMMM")
 		}
-
-		override fun hashCode(): Int {
-			return day
-		}
-
-		override fun toString() = "abs_$day"
 	}
 
 	object LongAgo : DateTimeAgo() {

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/model/SortOrder.kt

@@ -12,4 +12,5 @@ val SortOrder.titleRes: Int
 		SortOrder.RATING -> R.string.by_rating
 		SortOrder.NEWEST -> R.string.newest
 		SortOrder.ALPHABETICAL -> R.string.by_name
+		SortOrder.ALPHABETICAL_DESC -> R.string.by_name_reverse
 	}

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/util/PopupMenuMediator.kt

@@ -0,0 +1,38 @@
+package org.koitharu.kotatsu.core.ui.util
+
+import android.view.MenuItem
+import android.view.View
+import androidx.appcompat.widget.PopupMenu
+import androidx.core.view.MenuProvider
+import org.koitharu.kotatsu.core.util.ext.setOnContextClickListenerCompat
+
+class PopupMenuMediator(
+	private val provider: MenuProvider,
+) : View.OnLongClickListener, PopupMenu.OnMenuItemClickListener, PopupMenu.OnDismissListener {
+
+	override fun onLongClick(v: View): Boolean {
+		val menu = PopupMenu(v.context, v)
+		provider.onCreateMenu(menu.menu, menu.menuInflater)
+		provider.onPrepareMenu(menu.menu)
+		if (!menu.menu.hasVisibleItems()) {
+			return false
+		}
+		menu.setOnMenuItemClickListener(this)
+		menu.setOnDismissListener(this)
+		menu.show()
+		return true
+	}
+
+	override fun onMenuItemClick(item: MenuItem): Boolean {
+		return provider.onMenuItemSelected(item)
+	}
+
+	override fun onDismiss(menu: PopupMenu) {
+		provider.onMenuClosed(menu.menu)
+	}
+
+	fun attach(view: View) {
+		view.setOnLongClickListener(this)
+		view.setOnContextClickListenerCompat(this)
+	}
+}

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/util/WindowInsetsDelegate.kt

@@ -70,7 +70,7 @@ class WindowInsetsDelegate : OnApplyWindowInsetsListener, View.OnLayoutChangeLis
 		lastInsets = null
 	}
 
-	interface WindowInsetsListener {
+	fun interface WindowInsetsListener {
 
 		fun onWindowInsetsChanged(insets: Insets)
 	}

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/widgets/ChipsView.kt

@@ -1,21 +1,16 @@
 package org.koitharu.kotatsu.core.ui.widgets
 
-import android.annotation.SuppressLint
 import android.content.Context
-import android.content.res.ColorStateList
 import android.util.AttributeSet
 import android.view.View.OnClickListener
 import androidx.annotation.ColorRes
 import androidx.annotation.DrawableRes
-import androidx.core.content.ContextCompat
-import androidx.core.content.res.getColorStateListOrThrow
 import androidx.core.view.children
 import com.google.android.material.chip.Chip
 import com.google.android.material.chip.ChipDrawable
 import com.google.android.material.chip.ChipGroup
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.util.ext.castOrNull
-import com.google.android.material.R as materialR
 
 class ChipsView @JvmOverloads constructor(
 	context: Context,
@@ -31,9 +26,7 @@ class ChipsView @JvmOverloads constructor(
 	private val chipOnCloseListener = OnClickListener {
 		onChipCloseClickListener?.onChipCloseClick(it as Chip, it.tag)
 	}
-	private val defaultChipStrokeColor: ColorStateList
+	private val chipStyle: Int
-	private val defaultChipTextColor: ColorStateList
-	private val defaultChipIconTint: ColorStateList
 	var onChipClickListener: OnChipClickListener? = null
 		set(value) {
 			field = value
@@ -48,12 +41,17 @@ class ChipsView @JvmOverloads constructor(
 		}
 
 	init {
-		@SuppressLint("CustomViewStyleable")
+		val ta = context.obtainStyledAttributes(attrs, R.styleable.ChipsView, defStyleAttr, 0)
-		val a = context.obtainStyledAttributes(null, materialR.styleable.Chip, 0, R.style.Widget_Kotatsu_Chip)
+		chipStyle = ta.getResourceId(R.styleable.ChipsView_chipStyle, R.style.Widget_Kotatsu_Chip)
-		defaultChipStrokeColor = a.getColorStateListOrThrow(materialR.styleable.Chip_chipStrokeColor)
+		ta.recycle()
-		defaultChipTextColor = a.getColorStateListOrThrow(materialR.styleable.Chip_android_textColor)
+
-		defaultChipIconTint = a.getColorStateListOrThrow(materialR.styleable.Chip_chipIconTint)
+		if (isInEditMode) {
-		a.recycle()
+			setChips(
+				List(5) {
+					ChipModel(0, "Chip $it", 0, isCheckable = false, isChecked = false)
+				},
+			)
+		}
 	}
 
 	override fun requestLayout() {
@@ -91,15 +89,6 @@ class ChipsView @JvmOverloads constructor(
 
 	private fun bindChip(chip: Chip, model: ChipModel) {
 		chip.text = model.title
-		val tint = if (model.tint == 0) {
-			null
-		} else {
-			ContextCompat.getColorStateList(context, model.tint)
-		}
-		chip.chipIconTint = tint ?: defaultChipIconTint
-		chip.checkedIconTint = tint ?: defaultChipIconTint
-		chip.chipStrokeColor = tint ?: defaultChipStrokeColor
-		chip.setTextColor(tint ?: defaultChipTextColor)
 		chip.isClickable = onChipClickListener != null || model.isCheckable
 		chip.isCheckable = model.isCheckable
 		if (model.icon == 0) {
@@ -115,12 +104,10 @@ class ChipsView @JvmOverloads constructor(
 
 	private fun addChip(): Chip {
 		val chip = Chip(context)
-		val drawable = ChipDrawable.createFromAttributes(context, null, 0, R.style.Widget_Kotatsu_Chip)
+		val drawable = ChipDrawable.createFromAttributes(context, null, 0, chipStyle)
 		chip.setChipDrawable(drawable)
 		chip.isCheckedIconVisible = true
 		chip.isChipIconVisible = false
-		chip.setCheckedIconResource(R.drawable.ic_check)
-		chip.checkedIconTint = defaultChipIconTint
 		chip.isCloseIconVisible = onChipCloseClickListener != null
 		chip.setOnCloseIconClickListener(chipOnCloseListener)
 		chip.setEnsureMinTouchTargetSize(false)

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/widgets/CubicSlider.kt

@@ -1,8 +1,8 @@
 package org.koitharu.kotatsu.core.ui.widgets
 
 import android.content.Context
-import android.util.ArrayMap
 import android.util.AttributeSet
+import androidx.collection.MutableScatterMap
 import com.google.android.material.slider.Slider
 import kotlin.math.cbrt
 import kotlin.math.pow
@@ -12,7 +12,7 @@ class CubicSlider @JvmOverloads constructor(
 	attrs: AttributeSet? = null,
 ) : Slider(context, attrs) {
 
-	private val changeListeners = ArrayMap<OnChangeListener, OnChangeListenerMapper>(1)
+	private val changeListeners = MutableScatterMap<OnChangeListener, OnChangeListenerMapper>(1)
 
 	override fun setValue(value: Float) {
 		super.setValue(value.unmap())

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/widgets/NestedRecyclerView.kt

@@ -0,0 +1,44 @@
+package org.koitharu.kotatsu.core.ui.widgets
+
+import android.annotation.SuppressLint
+import android.content.Context
+import android.util.AttributeSet
+import android.view.MotionEvent
+import androidx.core.content.withStyledAttributes
+import androidx.recyclerview.widget.RecyclerView
+import org.koitharu.kotatsu.R
+
+class NestedRecyclerView @JvmOverloads constructor(
+	context: Context,
+	attrs: AttributeSet? = null
+) : RecyclerView(context, attrs) {
+
+	private var maxHeight: Int = 0
+
+	init {
+		context.withStyledAttributes(attrs, R.styleable.NestedRecyclerView) {
+			maxHeight = getDimensionPixelSize(R.styleable.NestedRecyclerView_maxHeight, maxHeight)
+		}
+	}
+
+	@SuppressLint("ClickableViewAccessibility")
+	override fun onTouchEvent(e: MotionEvent?): Boolean {
+		if (e?.actionMasked == MotionEvent.ACTION_UP) {
+			requestDisallowInterceptTouchEvent(false)
+		} else {
+			requestDisallowInterceptTouchEvent(true)
+		}
+		return super.onTouchEvent(e)
+	}
+
+	override fun onMeasure(widthSpec: Int, heightSpec: Int) {
+		super.onMeasure(
+			widthSpec,
+			if (maxHeight == 0) {
+				heightSpec
+			} else {
+				MeasureSpec.makeMeasureSpec(maxHeight, MeasureSpec.AT_MOST)
+			},
+		)
+	}
+}

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/widgets/SegmentedBarView.kt

@@ -11,6 +11,7 @@ import android.view.View
 import android.view.ViewOutlineProvider
 import androidx.annotation.ColorInt
 import androidx.annotation.FloatRange
+import androidx.collection.MutableFloatList
 import androidx.interpolator.view.animation.FastOutSlowInInterpolator
 import org.koitharu.kotatsu.core.util.ext.getAnimationDuration
 import org.koitharu.kotatsu.core.util.ext.isAnimationsEnabled
@@ -25,7 +26,7 @@ class SegmentedBarView @JvmOverloads constructor(
 
 	private val paint = Paint(Paint.ANTI_ALIAS_FLAG)
 	private val segmentsData = ArrayList<Segment>()
-	private val segmentsSizes = ArrayList<Float>()
+	private val segmentsSizes = MutableFloatList()
 	private var cornerSize = 0f
 	private var scaleFactor = 1f
 	private var scaleAnimator: ValueAnimator? = null

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/widgets/TipView.kt

@@ -22,7 +22,6 @@ import org.koitharu.kotatsu.core.util.ext.getThemeColorStateList
 import org.koitharu.kotatsu.core.util.ext.setTextAndVisible
 import org.koitharu.kotatsu.core.util.ext.textAndVisible
 import org.koitharu.kotatsu.databinding.ViewTipBinding
-import com.google.android.material.R as materialR
 
 class TipView @JvmOverloads constructor(
 	context: Context,

app/src/main/kotlin/org/koitharu/kotatsu/core/util/AcraScreenLogger.kt

@@ -9,10 +9,8 @@ import androidx.fragment.app.FragmentManager
 import androidx.fragment.app.FragmentManager.FragmentLifecycleCallbacks
 import org.acra.ACRA
 import org.koitharu.kotatsu.core.ui.DefaultActivityLifecycleCallbacks
-import java.text.DateFormat
+import java.time.LocalTime
-import java.text.SimpleDateFormat
+import java.time.temporal.ChronoUnit
-import java.util.Date
-import java.util.Locale
 import java.util.WeakHashMap
 import javax.inject.Inject
 import javax.inject.Singleton
@@ -20,7 +18,6 @@ import javax.inject.Singleton
 @Singleton
 class AcraScreenLogger @Inject constructor() : FragmentLifecycleCallbacks(), DefaultActivityLifecycleCallbacks {
 
-	private val timeFormat = SimpleDateFormat.getTimeInstance(DateFormat.DEFAULT, Locale.ROOT)
 	private val keys = WeakHashMap<Any, String>()
 
 	override fun onFragmentAttached(fm: FragmentManager, f: Fragment, context: Context) {
@@ -47,11 +44,10 @@ class AcraScreenLogger @Inject constructor() : FragmentLifecycleCallbacks(), Def
 	}
 
 	private fun Any.key() = keys.getOrPut(this) {
-		"${time()}: ${javaClass.simpleName}"
+		val time = LocalTime.now().truncatedTo(ChronoUnit.SECONDS)
+		"$time: ${javaClass.simpleName}"
 	}
 
-	private fun time() = timeFormat.format(Date())
-
 	@Suppress("DEPRECATION")
 	private fun Bundle?.contentToString() = this?.keySet()?.joinToString { k ->
 		val v = get(k)

app/src/main/kotlin/org/koitharu/kotatsu/core/util/GridTouchHelper.kt

@@ -1,70 +0,0 @@
-package org.koitharu.kotatsu.core.util
-
-import android.content.Context
-import android.view.GestureDetector
-import android.view.MotionEvent
-import kotlin.math.roundToInt
-
-class GridTouchHelper(
-	context: Context,
-	private val listener: OnGridTouchListener,
-) : GestureDetector.SimpleOnGestureListener() {
-
-	private val detector = GestureDetector(context, this)
-	private val width = context.resources.displayMetrics.widthPixels
-	private val height = context.resources.displayMetrics.heightPixels
-	private var isDispatching = false
-
-	init {
-		detector.setIsLongpressEnabled(true)
-		detector.setOnDoubleTapListener(this)
-	}
-
-	fun dispatchTouchEvent(event: MotionEvent) {
-		if (event.actionMasked == MotionEvent.ACTION_DOWN) {
-			isDispatching = listener.onProcessTouch(event.rawX.toInt(), event.rawY.toInt())
-		}
-		detector.onTouchEvent(event)
-	}
-
-	override fun onSingleTapConfirmed(event: MotionEvent): Boolean {
-		if (!isDispatching) {
-			return true
-		}
-		val xIndex = (event.rawX * 2f / width).roundToInt()
-		val yIndex = (event.rawY * 2f / height).roundToInt()
-		listener.onGridTouch(
-			when (xIndex) {
-				0 -> AREA_LEFT
-				1 -> {
-					when (yIndex) {
-						0 -> AREA_TOP
-						1 -> AREA_CENTER
-						2 -> AREA_BOTTOM
-						else -> return false
-					}
-				}
-
-				2 -> AREA_RIGHT
-				else -> return false
-			},
-		)
-		return true
-	}
-
-	companion object {
-
-		const val AREA_CENTER = 1
-		const val AREA_LEFT = 2
-		const val AREA_RIGHT = 3
-		const val AREA_TOP = 4
-		const val AREA_BOTTOM = 5
-	}
-
-	interface OnGridTouchListener {
-
-		fun onGridTouch(area: Int)
-
-		fun onProcessTouch(rawX: Int, rawY: Int): Boolean
-	}
-}

app/src/main/kotlin/org/koitharu/kotatsu/core/util/LocaleComparator.kt

@@ -4,23 +4,20 @@ import androidx.core.os.LocaleListCompat
 import org.koitharu.kotatsu.core.util.ext.map
 import java.util.Locale
 
-class LocaleComparator : Comparator<Locale?> {
+class LocaleComparator : Comparator<Locale> {
 
 	private val deviceLocales = LocaleListCompat.getAdjustedDefault()//LocaleManagerCompat.getSystemLocales(context)
 		.map { it.language }
 		.distinct()
 
-	override fun compare(a: Locale?, b: Locale?): Int {
+	override fun compare(a: Locale, b: Locale): Int {
-		return if (a === b) {
+		val indexA = deviceLocales.indexOf(a.language)
-			0
+		val indexB = deviceLocales.indexOf(b.language)
-		} else {
+		return when {
-			val indexA = if (a == null) -1 else deviceLocales.indexOf(a.language)
+			indexA < 0 && indexB < 0 -> compareValues(a.language, b.language)
-			val indexB = if (b == null) -1 else deviceLocales.indexOf(b.language)
+			indexA < 0 -> 1
-			if (indexA < 0 && indexB < 0) {
+			indexB < 0 -> -1
-				compareValues(a?.language, b?.language)
+			else -> compareValues(indexA, indexB)
-			} else {
-				-2 - (indexA - indexB)
-			}
 		}
 	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/core/util/ViewBadge.kt

@@ -21,7 +21,11 @@ class ViewBadge(
 		get() = badgeDrawable?.number ?: 0
 		set(value) {
 			val badge = badgeDrawable ?: initBadge()
-			badge.number = value
+			if (maxCharacterCount != 0) {
+				badge.number = value
+			} else {
+				badge.clearNumber()
+			}
 			badge.isVisible = value > 0
 		}
 
@@ -51,7 +55,13 @@ class ViewBadge(
 
 	fun setMaxCharacterCount(value: Int) {
 		maxCharacterCount = value
-		badgeDrawable?.maxCharacterCount = value
+		badgeDrawable?.let {
+			if (value == 0) {
+				it.clearNumber()
+			} else {
+				it.maxCharacterCount = value
+			}
+		}
 	}
 
 	private fun initBadge(): BadgeDrawable {

app/src/main/kotlin/org/koitharu/kotatsu/core/util/WorkServiceStopHelper.kt

@@ -1,7 +1,6 @@
 package org.koitharu.kotatsu.core.util
 
 import android.annotation.SuppressLint
-import androidx.lifecycle.asFlow
 import androidx.work.WorkInfo
 import androidx.work.WorkManager
 import androidx.work.WorkQuery
@@ -27,8 +26,7 @@ class WorkServiceStopHelper(
 	fun setup() {
 		processLifecycleScope.launch(Dispatchers.Default) {
 			workManagerProvider.get()
-				.getWorkInfosLiveData(WorkQuery.fromStates(WorkInfo.State.RUNNING))
+				.getWorkInfosFlow(WorkQuery.fromStates(WorkInfo.State.RUNNING))
-				.asFlow()
 				.map { it.isEmpty() }
 				.distinctUntilChanged()
 				.collectLatest {

app/src/main/kotlin/org/koitharu/kotatsu/core/util/ext/Android.kt

@@ -17,6 +17,7 @@ import android.content.SyncResult
 import android.content.pm.PackageManager
 import android.content.pm.ResolveInfo
 import android.database.SQLException
+import android.graphics.Bitmap
 import android.graphics.Color
 import android.net.Uri
 import android.os.Build
@@ -29,6 +30,7 @@ import android.view.Window
 import android.widget.Toast
 import androidx.activity.result.ActivityResultLauncher
 import androidx.annotation.IntegerRes
+import androidx.annotation.WorkerThread
 import androidx.core.app.ActivityOptionsCompat
 import androidx.core.app.NotificationManagerCompat
 import androidx.core.content.ContextCompat
@@ -37,6 +39,7 @@ import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.coroutineScope
 import androidx.work.CoroutineWorker
 import com.google.android.material.elevation.ElevationOverlayProvider
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.channels.awaitClose
 import kotlinx.coroutines.channels.trySendBlocking
 import kotlinx.coroutines.delay
@@ -45,7 +48,9 @@ import kotlinx.coroutines.flow.callbackFlow
 import kotlinx.coroutines.flow.distinctUntilChanged
 import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.runInterruptible
 import okio.IOException
+import okio.use
 import org.json.JSONException
 import org.jsoup.internal.StringUtil.StringJoiner
 import org.koitharu.kotatsu.BuildConfig
@@ -53,6 +58,7 @@ import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.parsers.util.runCatchingCancellable
 import org.xmlpull.v1.XmlPullParser
 import org.xmlpull.v1.XmlPullParserException
+import java.io.File
 import kotlin.math.roundToLong
 
 val Context.activityManager: ActivityManager?
@@ -130,7 +136,7 @@ fun Window.setNavigationBarTransparentCompat(context: Context, elevation: Float,
 	} else {
 		// Set navbar scrim 70% of navigationBarColor
 		ElevationOverlayProvider(context).compositeOverlayIfNeeded(
-			context.getThemeColor(android.R.attr.navigationBarColor, alphaFactor),
+			context.getThemeColor(R.attr.m3ColorBottomMenuBackground, alphaFactor),
 			elevation,
 		)
 	}
@@ -230,3 +236,18 @@ fun Context.checkNotificationPermission(): Boolean = if (Build.VERSION.SDK_INT >
 } else {
 	NotificationManagerCompat.from(this).areNotificationsEnabled()
 }
+
+@WorkerThread
+suspend fun Bitmap.compressToPNG(output: File) = runInterruptible(Dispatchers.IO) {
+	output.outputStream().use { os ->
+		if (!compress(Bitmap.CompressFormat.PNG, 100, os)) {
+			throw IOException("Failed to encode bitmap into PNG format")
+		}
+	}
+}
+
+fun Context.ensureRamAtLeast(requiredSize: Long) {
+	if (ramAvailable < requiredSize) {
+		throw IllegalStateException("Not enough free memory")
+	}
+}

app/src/main/kotlin/org/koitharu/kotatsu/core/util/ext/Coil.kt

@@ -25,7 +25,7 @@ fun ImageView.newImageRequest(lifecycleOwner: LifecycleOwner, data: Any?): Image
 	}
 	// disposeImageRequest()
 	return ImageRequest.Builder(context)
-		.data(data)
+		.data(data?.takeUnless { it == "" })
 		.lifecycle(lifecycleOwner)
 		.crossfade(context)
 		.target(this)

app/src/main/kotlin/org/koitharu/kotatsu/core/util/ext/ContentResolver.kt

@@ -50,7 +50,7 @@ private fun getVolumePathBeforeAndroid11(volumeId: String, context: Context): St
 	val length = ArrayReflect.getLength(checkNotNull(result))
 	(0 until length).firstNotNullOfOrNull { i ->
 		val storageVolumeElement = ArrayReflect.get(result, i)
-		val uuid = getUuid.invoke(storageVolumeElement) as String
+		val uuid = getUuid.invoke(storageVolumeElement) as String?
 		val primary = isPrimary.invoke(storageVolumeElement) as Boolean
 		when {
 			primary && volumeId == PRIMARY_VOLUME_NAME -> getPath.invoke(storageVolumeElement) as String

app/src/main/kotlin/org/koitharu/kotatsu/core/util/ext/Date.kt

@@ -1,30 +1,32 @@
 package org.koitharu.kotatsu.core.util.ext
 
-import android.annotation.SuppressLint
+import org.koitharu.kotatsu.core.ui.model.DateTimeAgo
-import android.text.format.DateUtils
+import java.time.Instant
-import java.text.SimpleDateFormat
+import java.time.LocalDate
-import java.util.*
+import java.time.LocalDateTime
-import java.util.concurrent.TimeUnit
+import java.time.ZoneId
+import java.time.temporal.ChronoUnit
 
-@SuppressLint("SimpleDateFormat")
+fun calculateTimeAgo(instant: Instant, showMonths: Boolean = false): DateTimeAgo {
-fun Date.format(pattern: String): String = SimpleDateFormat(pattern).format(this)
+	// TODO: Use Java 9's LocalDate.ofInstant().
+	val localDate = LocalDateTime.ofInstant(instant, ZoneId.systemDefault()).toLocalDate()
+	val now = LocalDate.now()
+	val diffDays = localDate.until(now, ChronoUnit.DAYS)
 
-fun Date.formatRelative(minResolution: Long): CharSequence = DateUtils.getRelativeTimeSpanString(
+	return when {
-	time, System.currentTimeMillis(), minResolution,
+		diffDays == 0L -> {
-)
+			if (instant.until(Instant.now(), ChronoUnit.MINUTES) < 3) DateTimeAgo.JustNow
-
+			else DateTimeAgo.Today
-fun Date.daysDiff(other: Long): Int {
+		}
-	val thisDay = time / TimeUnit.DAYS.toMillis(1L)
+		diffDays == 1L -> DateTimeAgo.Yesterday
-	val otherDay = other / TimeUnit.DAYS.toMillis(1L)
+		diffDays < 6 -> DateTimeAgo.DaysAgo(diffDays.toInt())
-	return (thisDay - otherDay).toInt()
+		else -> {
-}
+			val diffMonths = localDate.until(now, ChronoUnit.MONTHS)
-
+			if (showMonths && diffMonths <= 6) {
-fun Date.startOfDay(): Long {
+				DateTimeAgo.MonthsAgo(diffMonths.toInt())
-	val calendar = Calendar.getInstance()
+			} else {
-	calendar.time = this
+				DateTimeAgo.Absolute(localDate)
-	calendar[Calendar.HOUR_OF_DAY] = 0
+			}
-	calendar[Calendar.MINUTE] = 0
+		}
-	calendar[Calendar.SECOND] = 0
+	}
-	calendar[Calendar.MILLISECOND] = 0
-	return calendar.timeInMillis
 }

app/src/main/kotlin/org/koitharu/kotatsu/core/util/ext/Flow.kt

@@ -11,8 +11,10 @@ import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.onCompletion
 import kotlinx.coroutines.flow.onEach
+import kotlinx.coroutines.flow.transform
 import kotlinx.coroutines.flow.transformLatest
 import org.koitharu.kotatsu.R
+import java.util.concurrent.atomic.AtomicInteger
 
 fun <T> Flow<T>.onFirst(action: suspend (T) -> Unit): Flow<T> {
 	var isFirstCall = true
@@ -37,6 +39,14 @@ fun <T> Flow<T>.onEachWhile(action: suspend (T) -> Boolean): Flow<T> {
 	}
 }
 
+fun <T> Flow<T>.onEachIndexed(action: suspend (index: Int, T) -> Unit): Flow<T> {
+	val counter = AtomicInteger(0)
+	return transform { value ->
+		action(counter.getAndIncrement(), value)
+		return@transform emit(value)
+	}
+}
+
 inline fun <T, R> Flow<List<T>>.mapItems(crossinline transform: (T) -> R): Flow<List<R>> {
 	return map { list -> list.map(transform) }
 }

app/src/main/kotlin/org/koitharu/kotatsu/core/util/ext/LocaleList.kt

@@ -20,12 +20,13 @@ inline fun <T> LocaleListCompat.mapToSet(block: (Locale) -> T): Set<T> {
 
 fun LocaleListCompat.getOrThrow(index: Int) = get(index) ?: throw NoSuchElementException()
 
-fun String?.getLocaleDisplayName(context: Context): String {
+fun String.toLocale() = Locale(this)
+
+fun Locale?.getDisplayName(context: Context): String {
 	if (this == null) {
 		return context.getString(R.string.various_languages)
 	}
-	val lc = Locale(this)
+	return getDisplayLanguage(this).toTitleCase(this)
-	return lc.getDisplayLanguage(lc).toTitleCase(lc)
 }
 
 private class LocaleListCompatIterator(private val list: LocaleListCompat) : ListIterator<Locale> {

app/src/main/kotlin/org/koitharu/kotatsu/core/util/ext/Resources.kt

@@ -3,18 +3,18 @@ package org.koitharu.kotatsu.core.util.ext
 import android.annotation.SuppressLint
 import android.content.Context
 import android.content.res.Resources
-import android.util.TypedValue
 import androidx.annotation.Px
+import androidx.core.util.TypedValueCompat
 import kotlin.math.roundToInt
 
 @Px
-fun Resources.resolveDp(dp: Int) = (dp * displayMetrics.density).roundToInt()
+fun Resources.resolveDp(dp: Int) = resolveDp(dp.toFloat()).roundToInt()
 
 @Px
-fun Resources.resolveDp(dp: Float) = dp * displayMetrics.density
+fun Resources.resolveDp(dp: Float) = TypedValueCompat.dpToPx(dp, displayMetrics)
 
 @Px
-fun Resources.resolveSp(sp: Float) = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, sp, displayMetrics)
+fun Resources.resolveSp(sp: Float) = TypedValueCompat.spToPx(sp, displayMetrics)
 
 @SuppressLint("DiscouragedApi")
 fun Context.getSystemBoolean(resName: String, fallback: Boolean): Boolean {

app/src/main/kotlin/org/koitharu/kotatsu/core/util/ext/Theme.kt

@@ -8,9 +8,11 @@ import androidx.annotation.AttrRes
 import androidx.annotation.ColorInt
 import androidx.annotation.FloatRange
 import androidx.annotation.Px
+import androidx.annotation.StyleRes
 import androidx.core.content.ContextCompat
 import androidx.core.content.res.use
 import androidx.core.graphics.ColorUtils
+import com.google.android.material.R as materialR
 
 fun Context.getThemeDrawable(
 	@AttrRes resId: Int,
@@ -75,3 +77,7 @@ fun TypedArray.getDrawableCompat(context: Context, index: Int): Drawable? {
 	val resId = getResourceId(index, 0)
 	return if (resId != 0) ContextCompat.getDrawable(context, resId) else null
 }
+
+@get:StyleRes
+val DIALOG_THEME_CENTERED: Int
+	inline get() = materialR.style.ThemeOverlay_Material3_MaterialAlertDialog_Centered

app/src/main/kotlin/org/koitharu/kotatsu/core/util/ext/Throwable.kt

@@ -19,6 +19,11 @@ import org.koitharu.kotatsu.core.exceptions.SyncApiException
 import org.koitharu.kotatsu.core.exceptions.TooManyRequestExceptions
 import org.koitharu.kotatsu.core.exceptions.UnsupportedFileException
 import org.koitharu.kotatsu.core.exceptions.WrongPasswordException
+import org.koitharu.kotatsu.parsers.ErrorMessages.FILTER_BOTH_LOCALE_GENRES_NOT_SUPPORTED
+import org.koitharu.kotatsu.parsers.ErrorMessages.FILTER_BOTH_STATES_GENRES_NOT_SUPPORTED
+import org.koitharu.kotatsu.parsers.ErrorMessages.FILTER_MULTIPLE_GENRES_NOT_SUPPORTED
+import org.koitharu.kotatsu.parsers.ErrorMessages.FILTER_MULTIPLE_STATES_NOT_SUPPORTED
+import org.koitharu.kotatsu.parsers.ErrorMessages.SEARCH_NOT_SUPPORTED
 import org.koitharu.kotatsu.parsers.exception.AuthRequiredException
 import org.koitharu.kotatsu.parsers.exception.ContentUnavailableException
 import org.koitharu.kotatsu.parsers.exception.NotFoundException
@@ -28,9 +33,6 @@ import java.net.UnknownHostException
 
 private const val MSG_NO_SPACE_LEFT = "No space left on device"
 private const val IMAGE_FORMAT_NOT_SUPPORTED = "Image format not supported"
-private const val MULTIPLE_GENRES_NOT_SUPPORTED = "Multiple genres are not supported by this source"
-private const val MULTIPLE_STATES_NOT_SUPPORTED = "Multiple states are not supported by this source"
-private const val SEARCH_NOT_SUPPORTED = "Search is not supported by this source"
 
 fun Throwable.getDisplayMessage(resources: Resources): String = when (this) {
 	is AuthRequiredException -> resources.getString(R.string.auth_required)
@@ -85,9 +87,11 @@ private fun getDisplayMessage(msg: String?, resources: Resources): String? = whe
 	msg.isNullOrEmpty() -> null
 	msg.contains(MSG_NO_SPACE_LEFT) -> resources.getString(R.string.error_no_space_left)
 	msg.contains(IMAGE_FORMAT_NOT_SUPPORTED) -> resources.getString(R.string.error_corrupted_file)
-	msg == MULTIPLE_GENRES_NOT_SUPPORTED -> resources.getString(R.string.error_multiple_genres_not_supported)
+	msg == FILTER_MULTIPLE_GENRES_NOT_SUPPORTED -> resources.getString(R.string.error_multiple_genres_not_supported)
-	msg == MULTIPLE_STATES_NOT_SUPPORTED -> resources.getString(R.string.error_multiple_states_not_supported)
+	msg == FILTER_MULTIPLE_STATES_NOT_SUPPORTED -> resources.getString(R.string.error_multiple_states_not_supported)
 	msg == SEARCH_NOT_SUPPORTED -> resources.getString(R.string.error_search_not_supported)
+	msg == FILTER_BOTH_LOCALE_GENRES_NOT_SUPPORTED -> resources.getString(R.string.error_filter_locale_genre_not_supported)
+	msg == FILTER_BOTH_STATES_GENRES_NOT_SUPPORTED -> resources.getString(R.string.error_filter_states_genre_not_supported)
 	else -> null
 }
 

app/src/main/kotlin/org/koitharu/kotatsu/core/util/ext/View.kt

@@ -8,12 +8,16 @@ import android.view.View.MeasureSpec
 import android.view.ViewGroup
 import android.view.inputmethod.InputMethodManager
 import android.widget.Checkable
+import androidx.appcompat.widget.ActionMenuView
+import androidx.appcompat.widget.Toolbar
 import androidx.core.view.children
 import androidx.core.view.descendants
 import androidx.core.view.isVisible
 import androidx.recyclerview.widget.RecyclerView
 import androidx.recyclerview.widget.RecyclerView.ViewHolder
+import androidx.swiperefreshlayout.widget.CircularProgressDrawable
 import androidx.viewpager2.widget.ViewPager2
+import com.google.android.material.button.MaterialButton
 import com.google.android.material.progressindicator.BaseProgressIndicator
 import com.google.android.material.slider.Slider
 import com.google.android.material.tabs.TabLayout
@@ -104,6 +108,7 @@ fun RecyclerView.invalidateNestedItemDecorations() {
 val View.parentView: ViewGroup?
 	get() = parent as? ViewGroup
 
+@Suppress("UnusedReceiverParameter")
 fun View.measureDimension(desiredSize: Int, measureSpec: Int): Int {
 	var result: Int
 	val specMode = MeasureSpec.getMode(measureSpec)
@@ -152,3 +157,18 @@ fun View.setOnContextClickListenerCompat(listener: View.OnLongClickListener) {
 		setOnContextClickListener(listener::onLongClick)
 	}
 }
+
+val Toolbar.menuView: ActionMenuView?
+	get() {
+		menu // to call ensureMenu()
+		return children.firstNotNullOfOrNull { it as? ActionMenuView }
+	}
+
+fun MaterialButton.setProgressIcon() {
+	val progressDrawable = CircularProgressDrawable(context)
+	progressDrawable.strokeWidth = resources.resolveDp(2f)
+	progressDrawable.setColorSchemeColors(currentTextColor)
+	progressDrawable.setTintList(textColors)
+	icon = progressDrawable
+	progressDrawable.start()
+}

app/src/main/kotlin/org/koitharu/kotatsu/core/util/ext/WorkManager.kt

@@ -1,12 +1,14 @@
 package org.koitharu.kotatsu.core.util.ext
 
 import android.annotation.SuppressLint
+import androidx.work.Data
 import androidx.work.WorkInfo
 import androidx.work.WorkManager
 import androidx.work.WorkQuery
 import androidx.work.WorkRequest
 import androidx.work.await
 import androidx.work.impl.WorkManagerImpl
+import androidx.work.impl.model.WorkSpec
 import java.util.UUID
 import kotlin.coroutines.resume
 import kotlin.coroutines.resumeWithException
@@ -69,5 +71,24 @@ suspend fun WorkManager.awaitUpdateWork(request: WorkRequest): WorkManager.Updat
 	return updateWork(request).await()
 }
 
+@SuppressLint("RestrictedApi")
+suspend fun WorkManager.getWorkSpec(id: UUID): WorkSpec? = suspendCoroutine { cont ->
+	workManagerImpl.workTaskExecutor.executeOnTaskThread {
+		try {
+			val spec = workManagerImpl.workDatabase.workSpecDao().getWorkSpec(id.toString())
+			cont.resume(spec)
+		} catch (e: Exception) {
+			cont.resumeWithException(e)
+		}
+	}
+}
+
+
+@SuppressLint("RestrictedApi")
+suspend fun WorkManager.getWorkInputData(id: UUID): Data? = getWorkSpec(id)?.input
+
+val Data.isEmpty: Boolean
+	get() = this == Data.EMPTY
+
 private val WorkManager.workManagerImpl
 	@SuppressLint("RestrictedApi") inline get() = this as WorkManagerImpl

app/src/main/kotlin/org/koitharu/kotatsu/core/util/progress/PausingProgressJob.kt

@@ -1,26 +0,0 @@
-package org.koitharu.kotatsu.core.util.progress
-
-import androidx.annotation.AnyThread
-import kotlinx.coroutines.Job
-import kotlinx.coroutines.flow.StateFlow
-import org.koitharu.kotatsu.download.ui.worker.PausingHandle
-
-class PausingProgressJob<P>(
-	job: Job,
-	progress: StateFlow<P>,
-	private val pausingHandle: PausingHandle,
-) : ProgressJob<P>(job, progress) {
-
-	@get:AnyThread
-	val isPaused: Boolean
-		get() = pausingHandle.isPaused
-
-	@AnyThread
-	suspend fun awaitResumed() = pausingHandle.awaitResumed()
-
-	@AnyThread
-	fun pause() = pausingHandle.pause()
-
-	@AnyThread
-	fun resume() = pausingHandle.resume()
-}

app/src/main/kotlin/org/koitharu/kotatsu/core/util/progress/ProgressJob.kt

@@ -1,16 +0,0 @@
-package org.koitharu.kotatsu.core.util.progress
-
-import kotlinx.coroutines.Job
-import kotlinx.coroutines.flow.Flow
-import kotlinx.coroutines.flow.StateFlow
-
-open class ProgressJob<P>(
-	private val job: Job,
-	private val progress: StateFlow<P>,
-) : Job by job {
-
-	val progressValue: P
-		get() = progress.value
-
-	fun progressAsFlow(): Flow<P> = progress
-}

app/src/main/kotlin/org/koitharu/kotatsu/core/util/progress/TimeLeftEstimator.kt

@@ -1,6 +1,8 @@
 package org.koitharu.kotatsu.core.util.progress
 
 import android.os.SystemClock
+import androidx.collection.IntList
+import androidx.collection.MutableIntList
 import java.util.concurrent.TimeUnit
 import kotlin.math.roundToInt
 import kotlin.math.roundToLong
@@ -10,7 +12,7 @@ private const val NO_TIME = -1L
 
 class TimeLeftEstimator {
 
-	private var times = ArrayList<Int>()
+	private var times = MutableIntList()
 	private var lastTick: Tick? = null
 	private val tooLargeTime = TimeUnit.DAYS.toMillis(1)
 
@@ -50,6 +52,15 @@ class TimeLeftEstimator {
 		return if (etl == NO_TIME) NO_TIME else System.currentTimeMillis() + etl
 	}
 
+	private fun IntList.average(): Double {
+		if (isEmpty()) {
+			return 0.0
+		}
+		var acc = 0L
+		forEach { acc += it }
+		return acc / size.toDouble()
+	}
+
 	private class Tick(
 		@JvmField val value: Int,
 		@JvmField val total: Int,

app/src/main/kotlin/org/koitharu/kotatsu/details/data/MangaDetails.kt

@@ -21,8 +21,7 @@ data class MangaDetails(
 	val branches: Set<String?>
 		get() = chapters.keys
 
-	val allChapters: List<MangaChapter>
+	val allChapters: List<MangaChapter> by lazy { mergeChapters() }
-		get() = manga.chapters.orEmpty()
 
 	val isLocal
 		get() = manga.isLocal
@@ -40,4 +39,26 @@ data class MangaDetails(
 		description = description,
 		isLoaded = isLoaded,
 	)
+
+	private fun mergeChapters(): List<MangaChapter> {
+		val chapters = manga.chapters
+		val localChapters = local?.manga?.chapters.orEmpty()
+		if (chapters.isNullOrEmpty()) {
+			return localChapters
+		}
+		val localMap = if (localChapters.isNotEmpty()) {
+			localChapters.associateByTo(LinkedHashMap(localChapters.size)) { it.id }
+		} else {
+			null
+		}
+		val result = ArrayList<MangaChapter>(chapters.size)
+		for (chapter in chapters) {
+			val local = localMap?.remove(chapter.id)
+			result += local ?: chapter
+		}
+		if (!localMap.isNullOrEmpty()) {
+			result.addAll(localMap.values)
+		}
+		return result
+	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/details/data/ReadingTime.kt

@@ -0,0 +1,21 @@
+package org.koitharu.kotatsu.details.data
+
+import android.content.res.Resources
+import org.koitharu.kotatsu.R
+
+data class ReadingTime(
+	val minutes: Int,
+	val hours: Int,
+	val isContinue: Boolean,
+) {
+
+	fun format(resources: Resources): String = when {
+		hours == 0 -> resources.getQuantityString(R.plurals.minutes, minutes, minutes)
+		minutes == 0 -> resources.getQuantityString(R.plurals.hours, hours, hours)
+		else -> resources.getString(
+			R.string.remaining_time_pattern,
+			resources.getQuantityString(R.plurals.hours, hours, hours),
+			resources.getQuantityString(R.plurals.minutes, minutes, minutes),
+		)
+	}
+}

app/src/main/kotlin/org/koitharu/kotatsu/details/domain/ReadingTimeUseCase.kt

@@ -0,0 +1,39 @@
+package org.koitharu.kotatsu.details.domain
+
+import org.koitharu.kotatsu.core.model.MangaHistory
+import org.koitharu.kotatsu.core.model.findById
+import org.koitharu.kotatsu.core.prefs.AppSettings
+import org.koitharu.kotatsu.details.data.MangaDetails
+import org.koitharu.kotatsu.details.data.ReadingTime
+import javax.inject.Inject
+import kotlin.math.roundToInt
+
+class ReadingTimeUseCase @Inject constructor(
+	private val settings: AppSettings,
+) {
+
+	fun invoke(manga: MangaDetails?, branch: String?, history: MangaHistory?): ReadingTime? {
+		if (!settings.isReadingTimeEstimationEnabled) {
+			return null
+		}
+		// FIXME MAXIMUM HARDCODE!!! To do calculation with user's page read speed and his favourites/history mangas average pages in chapter
+		val chapters = manga?.chapters?.get(branch)
+		if (chapters.isNullOrEmpty()) {
+			return null
+		}
+		val isOnHistoryBranch = history != null && chapters.findById(history.chapterId) != null
+		// Impossible task, I guess. Good luck on this.
+		var averageTimeSec: Int = 20 * 10 * chapters.size // 20 pages, 10 seconds per page
+		if (isOnHistoryBranch) {
+			averageTimeSec = (averageTimeSec * (1f - checkNotNull(history).percent)).roundToInt()
+		}
+		if (averageTimeSec < 60) {
+			return null
+		}
+		return ReadingTime(
+			minutes = (averageTimeSec / 60) % 60,
+			hours = averageTimeSec / 3600,
+			isContinue = isOnHistoryBranch,
+		)
+	}
+}

app/src/main/kotlin/org/koitharu/kotatsu/details/service/MangaPrefetchService.kt

@@ -91,7 +91,7 @@ class MangaPrefetchService : CoroutineIntentService() {
 			val intent = Intent(context, MangaPrefetchService::class.java)
 			intent.action = ACTION_PREFETCH_DETAILS
 			intent.putExtra(EXTRA_MANGA, ParcelableManga(manga))
-			context.startService(intent)
+			tryStart(context, intent)
 		}
 
 		fun prefetchPages(context: Context, chapter: MangaChapter) {
@@ -99,19 +99,14 @@ class MangaPrefetchService : CoroutineIntentService() {
 			val intent = Intent(context, MangaPrefetchService::class.java)
 			intent.action = ACTION_PREFETCH_PAGES
 			intent.putExtra(EXTRA_CHAPTER, ParcelableChapter(chapter))
-			try {
+			tryStart(context, intent)
-				context.startService(intent)
-			} catch (e: IllegalStateException) {
-				// probably app is in background
-				e.printStackTraceDebug()
-			}
 		}
 
 		fun prefetchLast(context: Context) {
 			if (!isPrefetchAvailable(context, null)) return
 			val intent = Intent(context, MangaPrefetchService::class.java)
 			intent.action = ACTION_PREFETCH_LAST
-			context.startService(intent)
+			tryStart(context, intent)
 		}
 
 		private fun isPrefetchAvailable(context: Context, source: MangaSource?): Boolean {
@@ -127,5 +122,14 @@ class MangaPrefetchService : CoroutineIntentService() {
 			)
 			return entryPoint.contentCache.isCachingEnabled && entryPoint.settings.isContentPrefetchEnabled
 		}
+
+		private fun tryStart(context: Context, intent: Intent) {
+			try {
+				context.startService(intent)
+			} catch (e: IllegalStateException) {
+				// probably app is in background
+				e.printStackTraceDebug()
+			}
+		}
 	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/details/ui/ChaptersBottomSheetMediator.kt

@@ -6,12 +6,17 @@ import android.view.View
 import android.view.View.OnLayoutChangeListener
 import androidx.activity.OnBackPressedCallback
 import androidx.appcompat.view.ActionMode
+import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.bottomsheet.BottomSheetBehavior
+import com.google.android.material.tabs.TabLayout
 import org.koitharu.kotatsu.core.ui.util.ActionModeListener
 import org.koitharu.kotatsu.core.util.ext.doOnExpansionsChanged
+import org.koitharu.kotatsu.core.util.ext.setTabsEnabled
 
 class ChaptersBottomSheetMediator(
 	private val behavior: BottomSheetBehavior<*>,
+	private val pager: ViewPager2,
+	private val tabLayout: TabLayout,
 ) : OnBackPressedCallback(false),
 	ActionModeListener,
 	OnLayoutChangeListener, View.OnGenericMotionListener {
@@ -73,7 +78,7 @@ class ChaptersBottomSheetMediator(
 
 	fun lock() {
 		lockCounter++
-		behavior.isDraggable = lockCounter <= 0
+		updateLock()
 	}
 
 	fun unlock() {
@@ -81,6 +86,12 @@ class ChaptersBottomSheetMediator(
 		if (lockCounter < 0) {
 			lockCounter = 0
 		}
+		updateLock()
+	}
+
+	private fun updateLock() {
 		behavior.isDraggable = lockCounter <= 0
+		pager.isUserInputEnabled = lockCounter <= 0
+		tabLayout.setTabsEnabled(lockCounter <= 0)
 	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/details/ui/ChaptersMapper.kt

@@ -1,10 +1,14 @@
 package org.koitharu.kotatsu.details.ui
 
+import android.content.Context
+import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.bookmarks.domain.Bookmark
 import org.koitharu.kotatsu.core.model.MangaHistory
 import org.koitharu.kotatsu.details.data.MangaDetails
 import org.koitharu.kotatsu.details.ui.model.ChapterListItem
 import org.koitharu.kotatsu.details.ui.model.toListItem
+import org.koitharu.kotatsu.list.ui.model.ListHeader
+import org.koitharu.kotatsu.list.ui.model.ListModel
 import org.koitharu.kotatsu.parsers.util.mapToSet
 
 fun MangaDetails.mapChapters(
@@ -61,3 +65,22 @@ fun MangaDetails.mapChapters(
 	}
 	return result
 }
+
+fun List<ChapterListItem>.withVolumeHeaders(context: Context): List<ListModel> {
+	var prevVolume = 0
+	val result = ArrayList<ListModel>((size * 1.4).toInt())
+	for (item in this) {
+		val chapter = item.chapter
+		if (chapter.volume != prevVolume) {
+			val text = if (chapter.volume == 0) {
+				context.getString(R.string.volume_unknown)
+			} else {
+				context.getString(R.string.volume_, chapter.volume)
+			}
+			result.add(ListHeader(text))
+			prevVolume = chapter.volume
+		}
+		result.add(item)
+	}
+	return result
+}

app/src/main/kotlin/org/koitharu/kotatsu/details/ui/DetailsActivity.kt

@@ -4,7 +4,9 @@ import android.content.Context
 import android.content.Intent
 import android.graphics.Color
 import android.os.Bundle
+import android.text.style.DynamicDrawableSpan
 import android.text.style.ForegroundColorSpan
+import android.text.style.ImageSpan
 import android.text.style.RelativeSizeSpan
 import android.transition.AutoTransition
 import android.transition.Slide
@@ -22,13 +24,14 @@ import androidx.appcompat.widget.PopupMenu
 import androidx.core.graphics.Insets
 import androidx.core.text.buildSpannedString
 import androidx.core.text.inSpans
+import androidx.core.view.MenuHost
 import androidx.core.view.isGone
 import androidx.core.view.isVisible
 import androidx.core.view.updateLayoutParams
 import androidx.core.view.updatePadding
 import com.google.android.material.bottomsheet.BottomSheetBehavior
-import com.google.android.material.snackbar.BaseTransientBottomBar
 import com.google.android.material.snackbar.Snackbar
+import com.google.android.material.tabs.TabLayoutMediator
 import dagger.hilt.android.AndroidEntryPoint
 import kotlinx.coroutines.flow.FlowCollector
 import kotlinx.coroutines.flow.filterNotNull
@@ -37,15 +40,19 @@ import org.koitharu.kotatsu.core.exceptions.resolve.SnackbarErrorObserver
 import org.koitharu.kotatsu.core.model.parcelable.ParcelableManga
 import org.koitharu.kotatsu.core.os.AppShortcutManager
 import org.koitharu.kotatsu.core.parser.MangaIntent
+import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.ui.BaseActivity
 import org.koitharu.kotatsu.core.ui.util.MenuInvalidator
+import org.koitharu.kotatsu.core.ui.util.ReversibleActionObserver
 import org.koitharu.kotatsu.core.util.ext.doOnExpansionsChanged
 import org.koitharu.kotatsu.core.util.ext.getAnimationDuration
 import org.koitharu.kotatsu.core.util.ext.getThemeColor
 import org.koitharu.kotatsu.core.util.ext.isAnimationsEnabled
 import org.koitharu.kotatsu.core.util.ext.measureHeight
+import org.koitharu.kotatsu.core.util.ext.menuView
 import org.koitharu.kotatsu.core.util.ext.observe
 import org.koitharu.kotatsu.core.util.ext.observeEvent
+import org.koitharu.kotatsu.core.util.ext.recyclerView
 import org.koitharu.kotatsu.core.util.ext.setNavigationBarTransparentCompat
 import org.koitharu.kotatsu.core.util.ext.setNavigationIconSafe
 import org.koitharu.kotatsu.core.util.ext.setOnContextClickListenerCompat
@@ -54,6 +61,7 @@ import org.koitharu.kotatsu.databinding.ActivityDetailsBinding
 import org.koitharu.kotatsu.details.service.MangaPrefetchService
 import org.koitharu.kotatsu.details.ui.model.ChapterListItem
 import org.koitharu.kotatsu.details.ui.model.HistoryInfo
+import org.koitharu.kotatsu.details.ui.pager.DetailsPagerAdapter
 import org.koitharu.kotatsu.download.ui.worker.DownloadStartedObserver
 import org.koitharu.kotatsu.main.ui.owners.NoModalBottomSheetOwner
 import org.koitharu.kotatsu.parsers.model.Manga
@@ -74,10 +82,18 @@ class DetailsActivity :
 	@Inject
 	lateinit var appShortcutManager: AppShortcutManager
 
+	@Inject
+	lateinit var settings: AppSettings
+
 	private var buttonTip: WeakReference<ButtonTip>? = null
 
 	private val viewModel: DetailsViewModel by viewModels()
-	private lateinit var chaptersMenuProvider: ChaptersMenuProvider
+
+	val secondaryMenuHost: MenuHost
+		get() = viewBinding.toolbarChapters ?: this
+
+	var bottomSheetMediator: ChaptersBottomSheetMediator? = null
+		private set
 
 	override fun onCreate(savedInstanceState: Bundle?) {
 		super.onCreate(savedInstanceState)
@@ -93,24 +109,22 @@ class DetailsActivity :
 
 		if (viewBinding.layoutBottom != null) {
 			val behavior = BottomSheetBehavior.from(checkNotNull(viewBinding.layoutBottom))
-			val bsMediator = ChaptersBottomSheetMediator(behavior)
+			val bsMediator = ChaptersBottomSheetMediator(behavior, viewBinding.pager, viewBinding.tabs)
 			actionModeDelegate.addListener(bsMediator)
 			checkNotNull(viewBinding.layoutBsHeader).addOnLayoutChangeListener(bsMediator)
 			onBackPressedDispatcher.addCallback(bsMediator)
-			chaptersMenuProvider = ChaptersMenuProvider(viewModel, bsMediator)
+			bottomSheetMediator = bsMediator
 			behavior.doOnExpansionsChanged(::onChaptersSheetStateChanged)
 			viewBinding.toolbarChapters?.setNavigationOnClickListener {
 				behavior.state = BottomSheetBehavior.STATE_COLLAPSED
 			}
 			viewBinding.toolbarChapters?.setOnGenericMotionListener(bsMediator)
-		} else {
-			chaptersMenuProvider = ChaptersMenuProvider(viewModel, null)
-			addMenuProvider(chaptersMenuProvider)
 		}
-		onBackPressedDispatcher.addCallback(chaptersMenuProvider)
+		initPager()
 
 		viewModel.manga.filterNotNull().observe(this, ::onMangaUpdated)
 		viewModel.onMangaRemoved.observeEvent(this, ::onMangaRemoved)
+		viewModel.newChaptersCount.observe(this, ::onNewChaptersChanged)
 		viewModel.onError.observeEvent(
 			this,
 			SnackbarErrorObserver(
@@ -124,19 +138,16 @@ class DetailsActivity :
 				},
 			),
 		)
-		viewModel.onShowToast.observeEvent(this) {
+		viewModel.onActionDone.observeEvent(this, ReversibleActionObserver(viewBinding.containerDetails))
-			makeSnackbar(getString(it), Snackbar.LENGTH_SHORT).show()
-		}
 		viewModel.onShowTip.observeEvent(this) { showTip() }
 		viewModel.historyInfo.observe(this, ::onHistoryChanged)
 		viewModel.selectedBranch.observe(this) {
 			viewBinding.toolbarChapters?.subtitle = it
 			viewBinding.textViewSubtitle?.textAndVisible = it
 		}
-		viewModel.isChaptersReversed.observe(
+		val chaptersMenuInvalidator = MenuInvalidator(viewBinding.toolbarChapters ?: this)
-			this,
+		viewModel.isChaptersReversed.observe(this, chaptersMenuInvalidator)
-			MenuInvalidator(viewBinding.toolbarChapters ?: this),
+		viewModel.isChaptersEmpty.observe(this, chaptersMenuInvalidator)
-		)
 		val menuInvalidator = MenuInvalidator(this)
 		viewModel.favouriteCategories.observe(this, menuInvalidator)
 		viewModel.remoteManga.observe(this, menuInvalidator)
@@ -153,7 +164,7 @@ class DetailsActivity :
 			DetailsMenuProvider(
 				activity = this,
 				viewModel = viewModel,
-				snackbarHost = viewBinding.containerChapters,
+				snackbarHost = viewBinding.pager,
 				appShortcutManager = appShortcutManager,
 			),
 		)
@@ -217,12 +228,11 @@ class DetailsActivity :
 			TransitionManager.beginDelayedTransition(toolbar, transition)
 		}
 		if (isExpanded) {
-			toolbar.addMenuProvider(chaptersMenuProvider)
 			toolbar.setNavigationIconSafe(materialR.drawable.abc_ic_clear_material)
 		} else {
-			toolbar.removeMenuProvider(chaptersMenuProvider)
 			toolbar.navigationIcon = null
 		}
+		toolbar.menuView?.isVisible = isExpanded
 		viewBinding.buttonRead.isGone = isExpanded
 	}
 
@@ -293,11 +303,35 @@ class DetailsActivity :
 		viewBinding.textViewTitle?.text = text
 	}
 
+	private fun onNewChaptersChanged(count: Int) {
+		val tab = viewBinding.tabs.getTabAt(0) ?: return
+		if (count == 0) {
+			tab.removeBadge()
+		} else {
+			val badge = tab.orCreateBadge
+			badge.horizontalOffsetWithText = -resources.getDimensionPixelOffset(R.dimen.margin_small)
+			badge.number = count
+			badge.isVisible = true
+		}
+	}
+
 	private fun showBranchPopupMenu(v: View) {
 		val menu = PopupMenu(v.context, v)
 		val branches = viewModel.branches.value
 		for ((i, branch) in branches.withIndex()) {
 			val title = buildSpannedString {
+				if (branch.isCurrent) {
+					inSpans(
+						ImageSpan(
+							this@DetailsActivity,
+							R.drawable.ic_current_chapter,
+							DynamicDrawableSpan.ALIGN_BASELINE,
+						),
+					) {
+						append(' ')
+					}
+					append(' ')
+				}
 				append(branch.name ?: getString(R.string.system_default))
 				append(' ')
 				append(' ')
@@ -326,9 +360,8 @@ class DetailsActivity :
 		val manga = viewModel.manga.value ?: return
 		val chapterId = viewModel.historyInfo.value.history?.chapterId
 		if (chapterId != null && manga.chapters?.none { x -> x.id == chapterId } == true) {
-			val snackbar =
+			Snackbar.make(viewBinding.containerDetails, R.string.chapter_is_missing, Snackbar.LENGTH_SHORT)
-				makeSnackbar(getString(R.string.chapter_is_missing), Snackbar.LENGTH_SHORT)
+				.show()
-			snackbar.show()
 		} else {
 			startActivity(
 				IntentBuilder(this)
@@ -343,6 +376,15 @@ class DetailsActivity :
 		}
 	}
 
+	private fun initPager() {
+		val adapter = DetailsPagerAdapter(this)
+		viewBinding.pager.recyclerView?.isNestedScrollingEnabled = false
+		viewBinding.pager.offscreenPageLimit = 1
+		viewBinding.pager.adapter = adapter
+		TabLayoutMediator(viewBinding.tabs, viewBinding.pager, adapter).attach()
+		viewBinding.pager.setCurrentItem(settings.defaultDetailsTab, false)
+	}
+
 	private fun showBottomSheet(isVisible: Boolean) {
 		val view = viewBinding.layoutBottom ?: return
 		if (view.isVisible == isVisible) return
@@ -353,17 +395,6 @@ class DetailsActivity :
 		view.isVisible = isVisible
 	}
 
-	private fun makeSnackbar(
-		text: CharSequence,
-		@BaseTransientBottomBar.Duration duration: Int,
-	): Snackbar {
-		val sb = Snackbar.make(viewBinding.containerDetails, text, duration)
-		if (viewBinding.layoutBottom?.isVisible == true) {
-			sb.anchorView = viewBinding.toolbarChapters
-		}
-		return sb
-	}
-
 	private class PrefetchObserver(
 		private val context: Context,
 	) : FlowCollector<List<ChapterListItem>?> {

app/src/main/kotlin/org/koitharu/kotatsu/details/ui/DetailsFragment.kt

@@ -10,8 +10,6 @@ import android.widget.Toast
 import androidx.appcompat.widget.PopupMenu
 import androidx.core.content.ContextCompat
 import androidx.core.graphics.Insets
-import androidx.core.text.buildSpannedString
-import androidx.core.text.color
 import androidx.core.text.method.LinkMovementMethodCompat
 import androidx.core.view.isGone
 import androidx.core.view.isVisible
@@ -23,13 +21,14 @@ import coil.request.SuccessResult
 import coil.util.CoilUtils
 import com.google.android.material.chip.Chip
 import dagger.hilt.android.AndroidEntryPoint
-import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.filterNotNull
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.bookmarks.domain.Bookmark
 import org.koitharu.kotatsu.bookmarks.ui.adapter.BookmarksAdapter
 import org.koitharu.kotatsu.bookmarks.ui.sheet.BookmarksSheet
 import org.koitharu.kotatsu.core.model.countChaptersByBranch
+import org.koitharu.kotatsu.core.model.iconResId
+import org.koitharu.kotatsu.core.model.titleResId
 import org.koitharu.kotatsu.core.ui.BaseFragment
 import org.koitharu.kotatsu.core.ui.BaseListAdapter
 import org.koitharu.kotatsu.core.ui.image.CoverSizeResolver
@@ -40,7 +39,6 @@ import org.koitharu.kotatsu.core.util.FileSize
 import org.koitharu.kotatsu.core.util.ext.crossfade
 import org.koitharu.kotatsu.core.util.ext.drawableTop
 import org.koitharu.kotatsu.core.util.ext.enqueueWith
-import org.koitharu.kotatsu.core.util.ext.getThemeColor
 import org.koitharu.kotatsu.core.util.ext.ifNullOrEmpty
 import org.koitharu.kotatsu.core.util.ext.isTextTruncated
 import org.koitharu.kotatsu.core.util.ext.observe
@@ -50,6 +48,7 @@ import org.koitharu.kotatsu.core.util.ext.scaleUpActivityOptionsOf
 import org.koitharu.kotatsu.core.util.ext.showOrHide
 import org.koitharu.kotatsu.core.util.ext.textAndVisible
 import org.koitharu.kotatsu.databinding.FragmentDetailsBinding
+import org.koitharu.kotatsu.details.data.ReadingTime
 import org.koitharu.kotatsu.details.ui.model.ChapterListItem
 import org.koitharu.kotatsu.details.ui.model.HistoryInfo
 import org.koitharu.kotatsu.details.ui.related.RelatedMangaActivity
@@ -66,15 +65,15 @@ import org.koitharu.kotatsu.list.ui.size.StaticItemSizeResolver
 import org.koitharu.kotatsu.main.ui.owners.NoModalBottomSheetOwner
 import org.koitharu.kotatsu.parsers.model.Manga
 import org.koitharu.kotatsu.parsers.model.MangaSource
-import org.koitharu.kotatsu.parsers.model.MangaState
 import org.koitharu.kotatsu.parsers.model.MangaTag
 import org.koitharu.kotatsu.reader.ui.ReaderActivity
 import org.koitharu.kotatsu.scrobbling.common.domain.model.ScrobblingInfo
 import org.koitharu.kotatsu.scrobbling.common.ui.selector.ScrobblingSelectorSheet
 import org.koitharu.kotatsu.search.ui.MangaListActivity
 import org.koitharu.kotatsu.search.ui.SearchActivity
+import java.text.SimpleDateFormat
+import java.util.Date
 import javax.inject.Inject
-import com.google.android.material.R as materialR
 
 @AndroidEntryPoint
 class DetailsFragment :
@@ -121,7 +120,8 @@ class DetailsFragment :
 		viewModel.description.observe(viewLifecycleOwner, ::onDescriptionChanged)
 		viewModel.localSize.observe(viewLifecycleOwner, ::onLocalSizeChanged)
 		viewModel.relatedManga.observe(viewLifecycleOwner, ::onRelatedMangaChanged)
-		combine(viewModel.chapters, viewModel.newChaptersCount, ::Pair).observe(viewLifecycleOwner, ::onChaptersChanged)
+		viewModel.chapters.observe(viewLifecycleOwner, ::onChaptersChanged)
+		viewModel.readingTime.observe(viewLifecycleOwner, ::onReadingTimeChanged)
 	}
 
 	override fun onItemClick(item: Bookmark, view: View) {
@@ -181,28 +181,13 @@ class DetailsFragment :
 				ratingBar.isVisible = false
 			}
 
-			when (manga.state) {
+			infoLayout.textViewState.apply {
-				MangaState.FINISHED -> infoLayout.textViewState.apply {
+				manga.state?.let { state ->
-					textAndVisible = resources.getString(R.string.state_finished)
+					textAndVisible = resources.getString(state.titleResId)
-					drawableTop = ContextCompat.getDrawable(context, R.drawable.ic_state_finished)
+					drawableTop = ContextCompat.getDrawable(context, state.iconResId)
+				} ?: run {
+					isVisible = false
 				}
-
-				MangaState.ONGOING -> infoLayout.textViewState.apply {
-					textAndVisible = resources.getString(R.string.state_ongoing)
-					drawableTop = ContextCompat.getDrawable(context, R.drawable.ic_state_ongoing)
-				}
-
-				MangaState.ABANDONED -> infoLayout.textViewState.apply {
-					textAndVisible = resources.getString(R.string.state_abandoned)
-					drawableTop = ContextCompat.getDrawable(context, R.drawable.ic_state_abandoned)
-				}
-
-				MangaState.PAUSED -> infoLayout.textViewState.apply {
-					textAndVisible = resources.getString(R.string.state_paused)
-					drawableTop = ContextCompat.getDrawable(context, R.drawable.ic_action_pause)
-				}
-
-				null -> infoLayout.textViewState.isVisible = false
 			}
 			if (manga.source == MangaSource.LOCAL) {
 				infoLayout.textViewSource.isVisible = false
@@ -218,8 +203,7 @@ class DetailsFragment :
 		}
 	}
 
-	private fun onChaptersChanged(data: Pair<List<ChapterListItem>?, Int>) {
+	private fun onChaptersChanged(chapters: List<ChapterListItem>?) {
-		val (chapters, newChapters) = data
 		val infoLayout = requireViewBinding().infoLayout
 		if (chapters.isNullOrEmpty()) {
 			infoLayout.textViewChapters.isVisible = false
@@ -227,22 +211,23 @@ class DetailsFragment :
 			val count = chapters.countChaptersByBranch()
 			infoLayout.textViewChapters.isVisible = true
 			val chaptersText = resources.getQuantityString(R.plurals.chapters, count, count)
-			infoLayout.textViewChapters.text = if (newChapters == 0) {
+			infoLayout.textViewChapters.text = chaptersText
-				chaptersText
-			} else {
-				buildSpannedString {
-					append(chaptersText)
-					append(' ')
-					color(infoLayout.textViewChapters.context.getThemeColor(materialR.attr.colorError)) {
-						append("(+")
-						append(newChapters.toString())
-						append(')')
-					}
-				}
-			}
 		}
 	}
 
+	private fun onReadingTimeChanged(time: ReadingTime?) {
+		val binding = viewBinding ?: return
+		if (time == null) {
+			binding.approximateReadTimeLayout.isVisible = false
+			return
+		}
+		binding.approximateReadTime.text = time.format(resources)
+		binding.approximateReadTimeTitle.setText(
+			if (time.isContinue) R.string.approximate_remaining_time else R.string.approximate_reading_time
+		)
+		binding.approximateReadTimeLayout.isVisible = true
+	}
+
 	private fun onDescriptionChanged(description: CharSequence?) {
 		val tv = requireViewBinding().textViewDescription
 		if (description.isNullOrBlank()) {

app/src/main/kotlin/org/koitharu/kotatsu/details/ui/DetailsViewModel.kt

@@ -21,15 +21,18 @@ import kotlinx.coroutines.flow.mapLatest
 import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.plus
+import okio.FileNotFoundException
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.bookmarks.domain.Bookmark
 import org.koitharu.kotatsu.bookmarks.domain.BookmarksRepository
+import org.koitharu.kotatsu.core.model.findById
 import org.koitharu.kotatsu.core.model.getPreferredBranch
 import org.koitharu.kotatsu.core.parser.MangaIntent
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.prefs.ListMode
 import org.koitharu.kotatsu.core.prefs.observeAsStateFlow
 import org.koitharu.kotatsu.core.ui.BaseViewModel
+import org.koitharu.kotatsu.core.ui.util.ReversibleAction
 import org.koitharu.kotatsu.core.util.ext.MutableEventFlow
 import org.koitharu.kotatsu.core.util.ext.call
 import org.koitharu.kotatsu.core.util.ext.computeSize
@@ -40,6 +43,7 @@ import org.koitharu.kotatsu.details.domain.BranchComparator
 import org.koitharu.kotatsu.details.domain.DetailsInteractor
 import org.koitharu.kotatsu.details.domain.DetailsLoadUseCase
 import org.koitharu.kotatsu.details.domain.ProgressUpdateUseCase
+import org.koitharu.kotatsu.details.domain.ReadingTimeUseCase
 import org.koitharu.kotatsu.details.domain.RelatedMangaUseCase
 import org.koitharu.kotatsu.details.ui.model.ChapterListItem
 import org.koitharu.kotatsu.details.ui.model.HistoryInfo
@@ -53,6 +57,7 @@ import org.koitharu.kotatsu.local.data.LocalStorageChanges
 import org.koitharu.kotatsu.local.domain.DeleteLocalMangaUseCase
 import org.koitharu.kotatsu.local.domain.model.LocalManga
 import org.koitharu.kotatsu.parsers.model.Manga
+import org.koitharu.kotatsu.parsers.util.runCatchingCancellable
 import org.koitharu.kotatsu.scrobbling.common.domain.Scrobbler
 import org.koitharu.kotatsu.scrobbling.common.domain.model.ScrobblingInfo
 import org.koitharu.kotatsu.scrobbling.common.domain.model.ScrobblingStatus
@@ -73,13 +78,14 @@ class DetailsViewModel @Inject constructor(
 	private val extraProvider: ListExtraProvider,
 	private val detailsLoadUseCase: DetailsLoadUseCase,
 	private val progressUpdateUseCase: ProgressUpdateUseCase,
+	private val readingTimeUseCase: ReadingTimeUseCase,
 ) : BaseViewModel() {
 
 	private val intent = MangaIntent(savedStateHandle)
 	private val mangaId = intent.mangaId
 	private var loadingJob: Job
 
-	val onShowToast = MutableEventFlow<Int>()
+	val onActionDone = MutableEventFlow<ReversibleAction>()
 	val onShowTip = MutableEventFlow<Unit>()
 	val onSelectChapter = MutableEventFlow<Long>()
 	val onDownloadStarted = MutableEventFlow<Unit>()
@@ -134,8 +140,14 @@ class DetailsViewModel @Inject constructor(
 		.map { it?.local }
 		.distinctUntilChanged()
 		.map { local ->
-			local?.file?.computeSize() ?: 0L
+			if (local != null) {
-		}.stateIn(viewModelScope + Dispatchers.Default, SharingStarted.WhileSubscribed(), 0)
+				runCatchingCancellable {
+					local.file.computeSize()
+				}.getOrDefault(0L)
+			} else {
+				0L
+			}
+		}.stateIn(viewModelScope + Dispatchers.Default, SharingStarted.WhileSubscribed(5000), 0L)
 
 	@Deprecated("")
 	val description = details
@@ -160,10 +172,21 @@ class DetailsViewModel @Inject constructor(
 	val branches: StateFlow<List<MangaBranch>> = combine(
 		details,
 		selectedBranch,
-	) { m, b ->
+		history,
-		(m?.chapters ?: return@combine emptyList())
+	) { m, b, h ->
-			.map { x -> MangaBranch(x.key, x.value.size, x.key == b) }
+		val c = m?.chapters
-			.sortedWith(BranchComparator())
+		if (c.isNullOrEmpty()) {
+			return@combine emptyList()
+		}
+		val currentBranch = h?.let { m.allChapters.findById(it.chapterId) }?.branch
+		c.map { x ->
+			MangaBranch(
+				name = x.key,
+				count = x.value.size,
+				isSelected = x.key == b,
+				isCurrent = h != null && x.key == currentBranch,
+			)
+		}.sortedWith(BranchComparator())
 	}.stateIn(viewModelScope + Dispatchers.Default, SharingStarted.Eagerly, emptyList())
 
 	val isChaptersEmpty: StateFlow<Boolean> = details.map {
@@ -191,6 +214,14 @@ class DetailsViewModel @Inject constructor(
 		(if (reversed) list.asReversed() else list).filterSearch(query)
 	}.stateIn(viewModelScope, SharingStarted.Eagerly, emptyList())
 
+	val readingTime = combine(
+		details,
+		selectedBranch,
+		history,
+	) { m, b, h ->
+		readingTimeUseCase.invoke(m, b, h)
+	}.stateIn(viewModelScope, SharingStarted.Lazily, null)
+
 	val selectedBranchValue: String?
 		get() = selectedBranch.value
 
@@ -227,7 +258,7 @@ class DetailsViewModel @Inject constructor(
 	fun deleteLocal() {
 		val m = details.value?.local?.manga
 		if (m == null) {
-			onShowToast.call(R.string.file_not_found)
+			errorEvent.call(FileNotFoundException())
 			return
 		}
 		launchLoadingJob(Dispatchers.Default) {
@@ -239,7 +270,7 @@ class DetailsViewModel @Inject constructor(
 	fun removeBookmark(bookmark: Bookmark) {
 		launchJob(Dispatchers.Default) {
 			bookmarksRepository.removeBookmark(bookmark)
-			onShowToast.call(R.string.bookmark_removed)
+			onActionDone.call(ReversibleAction(R.string.bookmark_removed, null))
 		}
 	}
 

app/src/main/kotlin/org/koitharu/kotatsu/details/ui/adapter/BranchAD.kt

@@ -1,39 +0,0 @@
-package org.koitharu.kotatsu.details.ui.adapter
-
-import android.graphics.Color
-import android.text.Spannable
-import android.text.style.ForegroundColorSpan
-import android.text.style.RelativeSizeSpan
-import androidx.core.text.buildSpannedString
-import com.hannesdorfmann.adapterdelegates4.dsl.adapterDelegateViewBinding
-import org.koitharu.kotatsu.R
-import org.koitharu.kotatsu.core.ui.list.AdapterDelegateClickListenerAdapter
-import org.koitharu.kotatsu.core.ui.list.OnListItemClickListener
-import org.koitharu.kotatsu.core.util.ext.getThemeColor
-import org.koitharu.kotatsu.databinding.ItemCheckableNewBinding
-import org.koitharu.kotatsu.details.ui.model.MangaBranch
-
-fun branchAD(
-	clickListener: OnListItemClickListener<MangaBranch>,
-) = adapterDelegateViewBinding<MangaBranch, MangaBranch, ItemCheckableNewBinding>(
-	{ inflater, parent -> ItemCheckableNewBinding.inflate(inflater, parent, false) },
-) {
-
-	val clickAdapter = AdapterDelegateClickListenerAdapter(this, clickListener)
-	itemView.setOnClickListener(clickAdapter)
-	val counterColorSpan = ForegroundColorSpan(context.getThemeColor(android.R.attr.textColorSecondary, Color.LTGRAY))
-	val counterSizeSpan = RelativeSizeSpan(0.86f)
-
-	bind {
-		binding.root.text = buildSpannedString {
-			append(item.name ?: getString(R.string.system_default))
-			append(' ')
-			append(' ')
-			val start = length
-			append(item.count.toString())
-			setSpan(counterColorSpan, start, length, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
-			setSpan(counterSizeSpan, start, length, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
-		}
-		binding.root.isChecked = item.isSelected
-	}
-}

app/src/main/kotlin/org/koitharu/kotatsu/details/ui/adapter/ChapterListItemAD.kt

@@ -1,22 +1,23 @@
 package org.koitharu.kotatsu.details.ui.adapter
 
+import android.graphics.Typeface
 import androidx.core.content.ContextCompat
 import androidx.core.view.isVisible
 import com.hannesdorfmann.adapterdelegates4.dsl.adapterDelegateViewBinding
 import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.core.model.formatNumber
 import org.koitharu.kotatsu.core.ui.list.AdapterDelegateClickListenerAdapter
 import org.koitharu.kotatsu.core.ui.list.OnListItemClickListener
-import org.koitharu.kotatsu.core.util.ext.drawableEnd
 import org.koitharu.kotatsu.core.util.ext.drawableStart
-import org.koitharu.kotatsu.core.util.ext.getThemeColor
+import org.koitharu.kotatsu.core.util.ext.getThemeColorStateList
 import org.koitharu.kotatsu.core.util.ext.textAndVisible
 import org.koitharu.kotatsu.databinding.ItemChapterBinding
 import org.koitharu.kotatsu.details.ui.model.ChapterListItem
-import com.google.android.material.R as materialR
+import org.koitharu.kotatsu.list.ui.model.ListModel
 
 fun chapterListItemAD(
 	clickListener: OnListItemClickListener<ChapterListItem>,
-) = adapterDelegateViewBinding<ChapterListItem, ChapterListItem, ItemChapterBinding>(
+) = adapterDelegateViewBinding<ChapterListItem, ListModel, ItemChapterBinding>(
 	{ inflater, parent -> ItemChapterBinding.inflate(inflater, parent, false) },
 ) {
 
@@ -27,31 +28,38 @@ fun chapterListItemAD(
 	bind { payloads ->
 		if (payloads.isEmpty()) {
 			binding.textViewTitle.text = item.chapter.name
-			binding.textViewNumber.text = item.chapter.number.toString()
+			binding.textViewDescription.textAndVisible = item.description
-			binding.textViewDescription.textAndVisible = item.description()
 		}
 		when {
 			item.isCurrent -> {
-				binding.textViewNumber.setBackgroundResource(R.drawable.bg_badge_primary)
+				binding.textViewTitle.drawableStart = ContextCompat.getDrawable(context, R.drawable.ic_current_chapter)
-				binding.textViewNumber.setTextColor(context.getThemeColor(materialR.attr.colorOnPrimary))
+				binding.textViewTitle.setTextColor(context.getThemeColorStateList(android.R.attr.textColorPrimary))
+				binding.textViewDescription.setTextColor(context.getThemeColorStateList(android.R.attr.textColorPrimary))
+				binding.textViewTitle.typeface = Typeface.DEFAULT_BOLD
+				binding.textViewDescription.typeface = Typeface.DEFAULT_BOLD
 			}
 
 			item.isUnread -> {
-				binding.textViewNumber.setBackgroundResource(R.drawable.bg_badge_default)
+				binding.textViewTitle.drawableStart = if (item.isNew) {
-				binding.textViewNumber.setTextColor(context.getThemeColor(materialR.attr.colorOnTertiary))
+					ContextCompat.getDrawable(context, R.drawable.ic_new)
+				} else {
+					null
+				}
+				binding.textViewTitle.setTextColor(context.getThemeColorStateList(android.R.attr.textColorPrimary))
+				binding.textViewDescription.setTextColor(context.getThemeColorStateList(android.R.attr.textColorPrimary))
+				binding.textViewTitle.typeface = Typeface.DEFAULT
+				binding.textViewDescription.typeface = Typeface.DEFAULT
 			}
 
 			else -> {
-				binding.textViewNumber.setBackgroundResource(R.drawable.bg_badge_outline)
+				binding.textViewTitle.drawableStart = null
-				binding.textViewNumber.setTextColor(context.getThemeColor(android.R.attr.textColorTertiary))
+				binding.textViewTitle.setTextColor(context.getThemeColorStateList(android.R.attr.textColorHint))
+				binding.textViewDescription.setTextColor(context.getThemeColorStateList(android.R.attr.textColorHint))
+				binding.textViewTitle.typeface = Typeface.DEFAULT
+				binding.textViewDescription.typeface = Typeface.DEFAULT
 			}
 		}
 		binding.imageViewBookmarked.isVisible = item.isBookmarked
 		binding.imageViewDownloaded.isVisible = item.isDownloaded
-		binding.textViewTitle.drawableStart = if (item.isNew) {
-			ContextCompat.getDrawable(context, R.drawable.ic_new)
-		} else {
-			null
-		}
 	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/details/ui/adapter/ChaptersAdapter.kt

@@ -5,22 +5,20 @@ import org.koitharu.kotatsu.core.ui.BaseListAdapter
 import org.koitharu.kotatsu.core.ui.list.OnListItemClickListener
 import org.koitharu.kotatsu.core.ui.list.fastscroll.FastScroller
 import org.koitharu.kotatsu.details.ui.model.ChapterListItem
+import org.koitharu.kotatsu.list.ui.adapter.ListItemType
+import org.koitharu.kotatsu.list.ui.adapter.listHeaderAD
+import org.koitharu.kotatsu.list.ui.model.ListModel
 
 class ChaptersAdapter(
 	onItemClickListener: OnListItemClickListener<ChapterListItem>,
-) : BaseListAdapter<ChapterListItem>(), FastScroller.SectionIndexer {
+) : BaseListAdapter<ListModel>(), FastScroller.SectionIndexer {
 
 	init {
-		setHasStableIds(true)
+		addDelegate(ListItemType.CHAPTER, chapterListItemAD(onItemClickListener))
-		delegatesManager.addDelegate(chapterListItemAD(onItemClickListener))
+		addDelegate(ListItemType.HEADER, listHeaderAD(null))
-	}
-
-	override fun getItemId(position: Int): Long {
-		return items[position].chapter.id
 	}
 
 	override fun getSectionText(context: Context, position: Int): CharSequence? {
-		val item = items.getOrNull(position) ?: return null
+		return findHeader(position)?.getText(context)
-		return item.chapter.number.toString()
 	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/details/ui/model/ChapterListItem.kt

@@ -1,6 +1,8 @@
 package org.koitharu.kotatsu.details.ui.model
 
 import android.text.format.DateUtils
+import org.jsoup.internal.StringUtil.StringJoiner
+import org.koitharu.kotatsu.core.model.formatNumber
 import org.koitharu.kotatsu.list.ui.model.ListModel
 import org.koitharu.kotatsu.parsers.model.MangaChapter
 
@@ -10,6 +12,14 @@ data class ChapterListItem(
 	private val uploadDateMs: Long,
 ) : ListModel {
 
+	var description: String? = null
+		private set
+		get() {
+			if (field != null) return field
+			field = buildDescription()
+			return field
+		}
+
 	var uploadDate: CharSequence? = null
 		private set
 		get() {
@@ -38,13 +48,20 @@ data class ChapterListItem(
 	val isNew: Boolean
 		get() = hasFlag(FLAG_NEW)
 
-	fun description(): CharSequence? {
+	private fun buildDescription(): String {
-		val scanlator = chapter.scanlator?.takeUnless { it.isBlank() }
+		val joiner = StringJoiner(" • ")
-		return when {
+		chapter.formatNumber()?.let {
-			uploadDate != null && scanlator != null -> "$uploadDate • $scanlator"
+			joiner.add("#").append(it)
-			scanlator != null -> scanlator
-			else -> uploadDate
 		}
+		uploadDate?.let { date ->
+			joiner.add(date.toString())
+		}
+		chapter.scanlator?.let { scanlator ->
+			if (scanlator.isNotBlank()) {
+				joiner.add(scanlator)
+			}
+		}
+		return joiner.complete()
 	}
 
 	private fun hasFlag(flag: Int): Boolean {

app/src/main/kotlin/org/koitharu/kotatsu/details/ui/model/MangaBranch.kt

@@ -7,6 +7,7 @@ data class MangaBranch(
 	val name: String?,
 	val count: Int,
 	val isSelected: Boolean,
+	val isCurrent: Boolean,
 ) : ListModel {
 
 	override fun areItemsTheSame(other: ListModel): Boolean {

app/src/main/kotlin/org/koitharu/kotatsu/details/ui/pager/DetailsPagerAdapter.kt

@@ -0,0 +1,32 @@
+package org.koitharu.kotatsu.details.ui.pager
+
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.FragmentActivity
+import androidx.viewpager2.adapter.FragmentStateAdapter
+import com.google.android.material.tabs.TabLayout
+import com.google.android.material.tabs.TabLayoutMediator
+import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.details.ui.pager.chapters.ChaptersFragment
+import org.koitharu.kotatsu.details.ui.pager.pages.PagesFragment
+
+class DetailsPagerAdapter(activity: FragmentActivity) : FragmentStateAdapter(activity),
+	TabLayoutMediator.TabConfigurationStrategy {
+
+	override fun getItemCount(): Int = 2
+
+	override fun createFragment(position: Int): Fragment = when (position) {
+		0 -> ChaptersFragment()
+		1 -> PagesFragment()
+		else -> throw IllegalArgumentException("Invalid position $position")
+	}
+
+	override fun onConfigureTab(tab: TabLayout.Tab, position: Int) {
+		tab.setText(
+			when (position) {
+				0 -> R.string.chapters
+				1 -> R.string.pages
+				else -> 0
+			},
+		)
+	}
+}

app/src/main/kotlin/org/koitharu/kotatsu/details/ui/pager/chapters/ChaptersFragment.kt

@@ -1,6 +1,5 @@
-package org.koitharu.kotatsu.details.ui
+package org.koitharu.kotatsu.details.ui.pager.chapters
 
-import android.os.Build
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.Menu
@@ -11,7 +10,11 @@ import androidx.appcompat.view.ActionMode
 import androidx.core.graphics.Insets
 import androidx.core.view.isVisible
 import androidx.fragment.app.activityViewModels
+import androidx.lifecycle.Lifecycle
 import com.google.android.material.snackbar.Snackbar
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.flowOn
+import kotlinx.coroutines.flow.map
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.ui.BaseFragment
 import org.koitharu.kotatsu.core.ui.list.ListSelectionController
@@ -19,11 +22,16 @@ import org.koitharu.kotatsu.core.ui.list.OnListItemClickListener
 import org.koitharu.kotatsu.core.util.RecyclerViewScrollCallback
 import org.koitharu.kotatsu.core.util.ext.observe
 import org.koitharu.kotatsu.core.util.ext.observeEvent
-import org.koitharu.kotatsu.core.util.ext.scaleUpActivityOptionsOf
 import org.koitharu.kotatsu.databinding.FragmentChaptersBinding
+import org.koitharu.kotatsu.details.ui.ChaptersMenuProvider
+import org.koitharu.kotatsu.details.ui.DetailsActivity
+import org.koitharu.kotatsu.details.ui.DetailsViewModel
 import org.koitharu.kotatsu.details.ui.adapter.ChaptersAdapter
 import org.koitharu.kotatsu.details.ui.adapter.ChaptersSelectionDecoration
 import org.koitharu.kotatsu.details.ui.model.ChapterListItem
+import org.koitharu.kotatsu.details.ui.withVolumeHeaders
+import org.koitharu.kotatsu.list.ui.adapter.TypedListSpacingDecoration
+import org.koitharu.kotatsu.list.ui.model.ListModel
 import org.koitharu.kotatsu.local.ui.LocalChaptersRemoveService
 import org.koitharu.kotatsu.parsers.model.MangaSource
 import org.koitharu.kotatsu.reader.ui.ReaderActivity.IntentBuilder
@@ -55,21 +63,29 @@ class ChaptersFragment :
 			callback = this,
 		)
 		with(binding.recyclerViewChapters) {
+			addItemDecoration(TypedListSpacingDecoration(context, true))
 			checkNotNull(selectionController).attachToRecyclerView(this)
 			setHasFixedSize(true)
+			isNestedScrollingEnabled = false
 			adapter = chaptersAdapter
-			if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
-				scrollIndicators = if (resources.getBoolean(R.bool.is_tablet)) 0 else View.SCROLL_INDICATOR_TOP
-			}
 		}
 		viewModel.isLoading.observe(viewLifecycleOwner, this::onLoadingStateChanged)
-		viewModel.chapters.observe(viewLifecycleOwner, this::onChaptersChanged)
+		viewModel.chapters
+			.map { it.withVolumeHeaders(requireContext()) }
+			.flowOn(Dispatchers.Default)
+			.observe(viewLifecycleOwner, this::onChaptersChanged)
 		viewModel.isChaptersEmpty.observe(viewLifecycleOwner) {
 			binding.textViewHolder.isVisible = it
 		}
 		viewModel.onSelectChapter.observeEvent(viewLifecycleOwner) {
 			selectionController?.onItemLongClick(it)
 		}
+		val detailsActivity = activity as? DetailsActivity
+		if (detailsActivity != null) {
+			val menuProvider = ChaptersMenuProvider(viewModel, detailsActivity.bottomSheetMediator)
+			activity?.onBackPressedDispatcher?.addCallback(menuProvider)
+			detailsActivity.secondaryMenuHost.addMenuProvider(menuProvider, viewLifecycleOwner, Lifecycle.State.RESUMED)
+		}
 	}
 
 	override fun onDestroyView() {
@@ -78,6 +94,17 @@ class ChaptersFragment :
 		super.onDestroyView()
 	}
 
+	override fun onPause() {
+		// required for BottomSheetBehavior
+		requireViewBinding().recyclerViewChapters.isNestedScrollingEnabled = false
+		super.onPause()
+	}
+
+	override fun onResume() {
+		requireViewBinding().recyclerViewChapters.isNestedScrollingEnabled = true
+		super.onResume()
+	}
+
 	override fun onItemClick(item: ChapterListItem, view: View) {
 		if (selectionController?.onItemClick(item.chapter.id) == true) {
 			return
@@ -127,6 +154,9 @@ class ChaptersFragment :
 				val buffer = HashSet<Long>()
 				var isAdding = false
 				for (x in items) {
+					if (x !is ChapterListItem) {
+						continue
+					}
 					if (x.chapter.id in ids) {
 						isAdding = true
 						if (buffer.isNotEmpty()) {
@@ -142,7 +172,13 @@ class ChaptersFragment :
 			}
 
 			R.id.action_select_all -> {
-				val ids = chaptersAdapter?.items?.map { it.chapter.id } ?: return false
+				val ids = chaptersAdapter?.items?.mapNotNull {
+					if (it is ChapterListItem) {
+						it.chapter.id
+					} else {
+						null
+					}
+				} ?: return false
 				controller.addAll(ids)
 				true
 			}
@@ -166,7 +202,15 @@ class ChaptersFragment :
 	override fun onPrepareActionMode(controller: ListSelectionController, mode: ActionMode, menu: Menu): Boolean {
 		val selectedIds = selectionController?.peekCheckedIds() ?: return false
 		val allItems = chaptersAdapter?.items.orEmpty()
-		val items = allItems.withIndex().filter { (_, x) -> x.chapter.id in selectedIds }
+		val items = allItems.withIndex().mapNotNull<IndexedValue<ListModel>, IndexedValue<ChapterListItem>> { x ->
+			val value = x.value
+			@Suppress("UNCHECKED_CAST")
+			if (value is ChapterListItem && value.chapter.id in selectedIds) {
+				x as IndexedValue<ChapterListItem>
+			} else {
+				null
+			}
+		}
 		var canSave = true
 		var canDelete = true
 		items.forEach { (_, x) ->
@@ -195,10 +239,10 @@ class ChaptersFragment :
 
 	override fun onWindowInsetsChanged(insets: Insets) = Unit
 
-	private fun onChaptersChanged(list: List<ChapterListItem>) {
+	private fun onChaptersChanged(list: List<ListModel>) {
 		val adapter = chaptersAdapter ?: return
 		if (adapter.itemCount == 0) {
-			val position = list.indexOfFirst { it.isCurrent } - 1
+			val position = list.indexOfFirst { it is ChapterListItem && it.isCurrent } - 1
 			if (position > 0) {
 				val offset = (resources.getDimensionPixelSize(R.dimen.chapter_list_item_height) * 0.6).roundToInt()
 				adapter.setItems(

app/src/main/kotlin/org/koitharu/kotatsu/details/ui/pager/pages/PagesFragment.kt

@@ -0,0 +1,201 @@
+package org.koitharu.kotatsu.details.ui.pager.pages
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.core.graphics.Insets
+import androidx.core.view.isInvisible
+import androidx.core.view.isVisible
+import androidx.fragment.app.activityViewModels
+import androidx.fragment.app.viewModels
+import androidx.recyclerview.widget.GridLayoutManager
+import androidx.recyclerview.widget.RecyclerView
+import coil.ImageLoader
+import dagger.hilt.android.AndroidEntryPoint
+import kotlinx.coroutines.flow.combine
+import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.core.exceptions.resolve.SnackbarErrorObserver
+import org.koitharu.kotatsu.core.prefs.AppSettings
+import org.koitharu.kotatsu.core.ui.BaseFragment
+import org.koitharu.kotatsu.core.ui.list.BoundsScrollListener
+import org.koitharu.kotatsu.core.ui.list.OnListItemClickListener
+import org.koitharu.kotatsu.core.util.RecyclerViewScrollCallback
+import org.koitharu.kotatsu.core.util.ext.observe
+import org.koitharu.kotatsu.core.util.ext.observeEvent
+import org.koitharu.kotatsu.core.util.ext.showOrHide
+import org.koitharu.kotatsu.databinding.FragmentPagesBinding
+import org.koitharu.kotatsu.details.ui.DetailsViewModel
+import org.koitharu.kotatsu.list.ui.MangaListSpanResolver
+import org.koitharu.kotatsu.list.ui.adapter.ListItemType
+import org.koitharu.kotatsu.list.ui.adapter.TypedListSpacingDecoration
+import org.koitharu.kotatsu.list.ui.model.ListModel
+import org.koitharu.kotatsu.reader.ui.ReaderActivity.IntentBuilder
+import org.koitharu.kotatsu.reader.ui.ReaderState
+import org.koitharu.kotatsu.reader.ui.thumbnails.PageThumbnail
+import org.koitharu.kotatsu.reader.ui.thumbnails.adapter.PageThumbnailAdapter
+import javax.inject.Inject
+import kotlin.math.roundToInt
+
+@AndroidEntryPoint
+class PagesFragment :
+	BaseFragment<FragmentPagesBinding>(),
+	OnListItemClickListener<PageThumbnail> {
+
+	private val detailsViewModel by activityViewModels<DetailsViewModel>()
+	private val viewModel by viewModels<PagesViewModel>()
+
+	@Inject
+	lateinit var coil: ImageLoader
+
+	@Inject
+	lateinit var settings: AppSettings
+
+	private var thumbnailsAdapter: PageThumbnailAdapter? = null
+	private var spanResolver: MangaListSpanResolver? = null
+	private var scrollListener: ScrollListener? = null
+
+	private val spanSizeLookup = SpanSizeLookup()
+
+	override fun onCreate(savedInstanceState: Bundle?) {
+		super.onCreate(savedInstanceState)
+		combine(
+			detailsViewModel.details,
+			detailsViewModel.history,
+			detailsViewModel.selectedBranch,
+		) { details, history, branch ->
+			if (details != null && (details.isLoaded || details.chapters.isNotEmpty())) {
+				PagesViewModel.State(details, history, branch)
+			} else {
+				null
+			}
+		}.observe(this, viewModel::updateState)
+	}
+
+	override fun onCreateViewBinding(inflater: LayoutInflater, container: ViewGroup?): FragmentPagesBinding {
+		return FragmentPagesBinding.inflate(inflater, container, false)
+	}
+
+	override fun onViewBindingCreated(binding: FragmentPagesBinding, savedInstanceState: Bundle?) {
+		super.onViewBindingCreated(binding, savedInstanceState)
+		spanResolver = MangaListSpanResolver(binding.root.resources)
+		thumbnailsAdapter = PageThumbnailAdapter(
+			coil = coil,
+			lifecycleOwner = viewLifecycleOwner,
+			clickListener = this@PagesFragment,
+		)
+		with(binding.recyclerView) {
+			addItemDecoration(TypedListSpacingDecoration(context, false))
+			adapter = thumbnailsAdapter
+			setHasFixedSize(true)
+			isNestedScrollingEnabled = false
+			addOnLayoutChangeListener(spanResolver)
+			spanResolver?.setGridSize(settings.gridSize / 100f, this)
+			addOnScrollListener(ScrollListener().also { scrollListener = it })
+			(layoutManager as GridLayoutManager).let {
+				it.spanSizeLookup = spanSizeLookup
+				it.spanCount = checkNotNull(spanResolver).spanCount
+			}
+		}
+		detailsViewModel.isChaptersEmpty.observe(viewLifecycleOwner, ::onNoChaptersChanged)
+		viewModel.thumbnails.observe(viewLifecycleOwner, ::onThumbnailsChanged)
+		viewModel.onError.observeEvent(viewLifecycleOwner, SnackbarErrorObserver(binding.recyclerView, this))
+		viewModel.isLoading.observe(viewLifecycleOwner) { binding.progressBar.showOrHide(it) }
+		viewModel.isLoadingUp.observe(viewLifecycleOwner) { binding.progressBarTop.showOrHide(it) }
+		viewModel.isLoadingDown.observe(viewLifecycleOwner) { binding.progressBarBottom.showOrHide(it) }
+	}
+
+	override fun onDestroyView() {
+		spanResolver = null
+		scrollListener = null
+		thumbnailsAdapter = null
+		spanSizeLookup.invalidateCache()
+		super.onDestroyView()
+	}
+
+	override fun onPause() {
+		// required for BottomSheetBehavior
+		requireViewBinding().recyclerView.isNestedScrollingEnabled = false
+		super.onPause()
+	}
+
+	override fun onResume() {
+		requireViewBinding().recyclerView.isNestedScrollingEnabled = true
+		super.onResume()
+	}
+
+	override fun onWindowInsetsChanged(insets: Insets) = Unit
+
+	override fun onItemClick(item: PageThumbnail, view: View) {
+		val manga = detailsViewModel.manga.value ?: return
+		val state = ReaderState(item.page.chapterId, item.page.index, 0)
+		val intent = IntentBuilder(view.context).manga(manga).state(state).build()
+		startActivity(intent)
+	}
+
+	private suspend fun onThumbnailsChanged(list: List<ListModel>) {
+		val adapter = thumbnailsAdapter ?: return
+		if (adapter.itemCount == 0) {
+			var position = list.indexOfFirst { it is PageThumbnail && it.isCurrent }
+			if (position > 0) {
+				val spanCount = spanResolver?.spanCount ?: 0
+				val offset = if (position > spanCount + 1) {
+					(resources.getDimensionPixelSize(R.dimen.manga_list_details_item_height) * 0.6).roundToInt()
+				} else {
+					position = 0
+					0
+				}
+				val scrollCallback = RecyclerViewScrollCallback(requireViewBinding().recyclerView, position, offset)
+				adapter.emit(list)
+				scrollCallback.run()
+			} else {
+				adapter.emit(list)
+			}
+		} else {
+			adapter.emit(list)
+		}
+		spanSizeLookup.invalidateCache()
+		viewBinding?.recyclerView?.let {
+			scrollListener?.postInvalidate(it)
+		}
+	}
+
+	private fun onNoChaptersChanged(isNoChapters: Boolean) {
+		with(viewBinding ?: return) {
+			textViewHolder.isVisible = isNoChapters
+			recyclerView.isInvisible = isNoChapters
+		}
+	}
+
+	private inner class ScrollListener : BoundsScrollListener(3, 3) {
+
+		override fun onScrolledToStart(recyclerView: RecyclerView) {
+			viewModel.loadPrevChapter()
+		}
+
+		override fun onScrolledToEnd(recyclerView: RecyclerView) {
+			viewModel.loadNextChapter()
+		}
+	}
+
+	private inner class SpanSizeLookup : GridLayoutManager.SpanSizeLookup() {
+
+		init {
+			isSpanIndexCacheEnabled = true
+			isSpanGroupIndexCacheEnabled = true
+		}
+
+		override fun getSpanSize(position: Int): Int {
+			val total = (viewBinding?.recyclerView?.layoutManager as? GridLayoutManager)?.spanCount ?: return 1
+			return when (thumbnailsAdapter?.getItemViewType(position)) {
+				ListItemType.PAGE_THUMB.ordinal -> 1
+				else -> total
+			}
+		}
+
+		fun invalidateCache() {
+			invalidateSpanGroupIndexCache()
+			invalidateSpanIndexCache()
+		}
+	}
+}