Suggestions

.idea/misc.xml

@@ -9,6 +9,8 @@
         <entry key="../../../../.gradle/caches/transforms-3/0998d1b3fbd6b77213a827054a7dfcfd/transformed/appcompat-1.2.0/res/layout/abc_alert_dialog_material.xml" value="0.25885416666666666" />
         <entry key="../../../../.gradle/caches/transforms-3/0998d1b3fbd6b77213a827054a7dfcfd/transformed/appcompat-1.2.0/res/layout/abc_select_dialog_material.xml" value="0.25885416666666666" />
         <entry key="../../../../.gradle/caches/transforms-3/688e95ad986d2d0286c79f787589b7cb/transformed/material-1.3.0/res/layout/mtrl_alert_dialog.xml" value="0.25885416666666666" />
+        <entry key="app/src/main/res/drawable/ic_storage.xml" value="0.275" />
+        <entry key="app/src/main/res/drawable/ic_suggestion.xml" value="0.275" />
         <entry key="app/src/main/res/drawable/tab_indicator.xml" value="0.28512820512820514" />
         <entry key="app/src/main/res/drawable/tabs_background.xml" value="0.28512820512820514" />
         <entry key="app/src/main/res/layout-w600dp/activity_details.xml" value="0.18072916666666666" />
@@ -33,6 +35,7 @@
         <entry key="app/src/main/res/layout/item_recent.xml" value="0.2601851851851852" />
         <entry key="app/src/main/res/layout/item_source_config.xml" value="0.25885416666666666" />
         <entry key="app/src/main/res/layout/sheet_pages.xml" value="0.2601851851851852" />
+        <entry key="app/src/main/res/menu/nav_drawer.xml" value="0.25885416666666666" />
         <entry key="app/src/main/res/menu/opt_protect.xml" value="0.26927083333333335" />
         <entry key="app/src/main/res/menu/popup_category.xml" value="0.2601851851851852" />
         <entry key="app/src/main/res/xml/pref_main.xml" value="0.26927083333333335" />

app/src/main/java/org/koitharu/kotatsu/KotatsuApp.kt

@@ -26,6 +26,7 @@ import org.koitharu.kotatsu.reader.readerModule
 import org.koitharu.kotatsu.remotelist.remoteListModule
 import org.koitharu.kotatsu.search.searchModule
 import org.koitharu.kotatsu.settings.settingsModule
+import org.koitharu.kotatsu.suggestions.suggestionsModule
 import org.koitharu.kotatsu.tracker.trackerModule
 import org.koitharu.kotatsu.widget.WidgetUpdater
 import org.koitharu.kotatsu.widget.appWidgetModule
@@ -65,7 +66,8 @@ class KotatsuApp : Application() {
 				trackerModule,
 				settingsModule,
 				readerModule,
-				appWidgetModule
+				appWidgetModule,
+				suggestionsModule,
 			)
 		}
 	}

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

@@ -10,6 +10,8 @@ import org.koitharu.kotatsu.favourites.data.FavouriteEntity
 import org.koitharu.kotatsu.favourites.data.FavouritesDao
 import org.koitharu.kotatsu.history.data.HistoryDao
 import org.koitharu.kotatsu.history.data.HistoryEntity
+import org.koitharu.kotatsu.suggestions.data.SuggestionDao
+import org.koitharu.kotatsu.suggestions.data.SuggestionEntity
 
 @Database(
 	entities = [
@@ -35,4 +37,6 @@ abstract class MangaDatabase : RoomDatabase() {
 	abstract val tracksDao: TracksDao
 
 	abstract val trackLogsDao: TrackLogsDao
+
+	abstract val suggestionDao: SuggestionDao
 }

app/src/main/java/org/koitharu/kotatsu/core/prefs/AppSection.kt

@@ -2,5 +2,5 @@ package org.koitharu.kotatsu.core.prefs
 
 enum class AppSection {
 
-	LOCAL, FAVOURITES, HISTORY, FEED
+	LOCAL, FAVOURITES, HISTORY, FEED, SUGGESTIONS
 }

app/src/main/java/org/koitharu/kotatsu/history/data/HistoryDao.kt

@@ -3,6 +3,7 @@ package org.koitharu.kotatsu.history.data
 import androidx.room.*
 import kotlinx.coroutines.flow.Flow
 import org.koitharu.kotatsu.core.db.entity.MangaEntity
+import org.koitharu.kotatsu.core.db.entity.TagEntity
 
 
 @Dao
@@ -22,6 +23,9 @@ abstract class HistoryDao {
 	@Query("SELECT * FROM manga WHERE manga_id IN (SELECT manga_id FROM history)")
 	abstract suspend fun findAllManga(): List<MangaEntity>
 
+	@Query("SELECT * FROM tags WHERE tag_id IN (SELECT tag_id FROM manga_tags WHERE manga_id IN (SELECT manga_id FROM history))")
+	abstract suspend fun findAllTags(): List<TagEntity>
+
 	@Query("SELECT * FROM history WHERE manga_id = :id")
 	abstract suspend fun find(id: Long): HistoryEntity?
 

app/src/main/java/org/koitharu/kotatsu/history/domain/HistoryRepository.kt

@@ -8,6 +8,7 @@ import org.koitharu.kotatsu.core.db.entity.MangaEntity
 import org.koitharu.kotatsu.core.db.entity.TagEntity
 import org.koitharu.kotatsu.core.model.Manga
 import org.koitharu.kotatsu.core.model.MangaHistory
+import org.koitharu.kotatsu.core.model.MangaTag
 import org.koitharu.kotatsu.history.data.HistoryEntity
 import org.koitharu.kotatsu.tracker.domain.TrackingRepository
 import org.koitharu.kotatsu.utils.ext.mapItems
@@ -84,4 +85,8 @@ class HistoryRepository(
 			db.historyDao.delete(manga.id)
 		}
 	}
+
+	suspend fun getAllTags(): List<MangaTag> {
+		return db.historyDao.findAllTags().map { x -> x.toMangaTag() }
+	}
 }

app/src/main/java/org/koitharu/kotatsu/main/ui/MainActivity.kt

@@ -32,6 +32,8 @@ import org.koitharu.kotatsu.remotelist.ui.RemoteListFragment
 import org.koitharu.kotatsu.search.ui.SearchHelper
 import org.koitharu.kotatsu.settings.AppUpdateChecker
 import org.koitharu.kotatsu.settings.SettingsActivity
+import org.koitharu.kotatsu.suggestions.ui.SuggestionsFragment
+import org.koitharu.kotatsu.suggestions.ui.SuggestionsWorker
 import org.koitharu.kotatsu.tracker.ui.FeedFragment
 import org.koitharu.kotatsu.tracker.work.TrackWorker
 import org.koitharu.kotatsu.utils.ext.getDisplayMessage
@@ -75,6 +77,7 @@ class MainActivity : BaseActivity<ActivityMainBinding>(),
 		}
 		if (savedInstanceState == null) {
 			TrackWorker.setup(applicationContext)
+			SuggestionsWorker.setup(applicationContext)
 			AppUpdateChecker(this).launchIfNeeded()
 		}
 
@@ -144,6 +147,10 @@ class MainActivity : BaseActivity<ActivityMainBinding>(),
 				viewModel.defaultSection = AppSection.LOCAL
 				setPrimaryFragment(LocalListFragment.newInstance())
 			}
+			R.id.nav_suggestions -> {
+				viewModel.defaultSection = AppSection.SUGGESTIONS
+				setPrimaryFragment(SuggestionsFragment.newInstance())
+			}
 			R.id.nav_feed -> {
 				viewModel.defaultSection = AppSection.FEED
 				setPrimaryFragment(FeedFragment.newInstance())
@@ -229,6 +236,10 @@ class MainActivity : BaseActivity<ActivityMainBinding>(),
 				binding.navigationView.setCheckedItem(R.id.nav_feed)
 				setPrimaryFragment(FeedFragment.newInstance())
 			}
+			AppSection.SUGGESTIONS -> {
+				binding.navigationView.setCheckedItem(R.id.nav_suggestions)
+				setPrimaryFragment(SuggestionsFragment.newInstance())
+			}
 		}
 	}
 

app/src/main/java/org/koitharu/kotatsu/suggestions/SuggestionsModule.kt

@@ -0,0 +1,14 @@
+package org.koitharu.kotatsu.suggestions
+
+import org.koin.androidx.viewmodel.dsl.viewModel
+import org.koin.dsl.module
+import org.koitharu.kotatsu.suggestions.domain.SuggestionRepository
+import org.koitharu.kotatsu.suggestions.ui.SuggestionsViewModel
+
+val suggestionsModule
+	get() = module {
+
+		factory { SuggestionRepository(get()) }
+
+		viewModel { SuggestionsViewModel(get(), get()) }
+	}

app/src/main/java/org/koitharu/kotatsu/suggestions/data/SuggestionDao.kt

@@ -0,0 +1,28 @@
+package org.koitharu.kotatsu.suggestions.data
+
+import androidx.room.*
+import kotlinx.coroutines.flow.Flow
+
+@Dao
+abstract class SuggestionDao {
+
+	@Transaction
+	@Query("SELECT * FROM suggestions ORDER BY relevance DESC")
+	abstract fun observeAll(): Flow<List<SuggestionWithManga>>
+
+	@Insert(onConflict = OnConflictStrategy.IGNORE)
+	abstract suspend fun insert(entity: SuggestionEntity): Long
+
+	@Update
+	abstract suspend fun update(entity: SuggestionEntity): Int
+
+	@Query("DELETE FROM suggestions")
+	abstract suspend fun deleteAll()
+
+	@Transaction
+	open suspend fun upsert(entity: SuggestionEntity) {
+		if (update(entity) == 0) {
+			insert(entity)
+		}
+	}
+}

app/src/main/java/org/koitharu/kotatsu/suggestions/data/SuggestionEntity.kt

@@ -1,9 +1,11 @@
-package org.koitharu.kotatsu.core.db.entity
+package org.koitharu.kotatsu.suggestions.data
 
+import androidx.annotation.FloatRange
 import androidx.room.ColumnInfo
 import androidx.room.Entity
 import androidx.room.ForeignKey
 import androidx.room.PrimaryKey
+import org.koitharu.kotatsu.core.db.entity.MangaEntity
 
 @Entity(
 	tableName = "suggestions",
@@ -19,6 +21,7 @@ import androidx.room.PrimaryKey
 data class SuggestionEntity(
 	@PrimaryKey(autoGenerate = false)
 	@ColumnInfo(name = "manga_id", index = true) val mangaId: Long,
+	@FloatRange(from = 0.0, to = 1.0)
 	@ColumnInfo(name = "relevance") val relevance: Float,
 	@ColumnInfo(name = "created_at") val createdAt: Long = System.currentTimeMillis(),
 )

app/src/main/java/org/koitharu/kotatsu/suggestions/data/SuggestionWithManga.kt

@@ -0,0 +1,23 @@
+package org.koitharu.kotatsu.suggestions.data
+
+import androidx.room.Embedded
+import androidx.room.Junction
+import androidx.room.Relation
+import org.koitharu.kotatsu.core.db.entity.MangaEntity
+import org.koitharu.kotatsu.core.db.entity.MangaTagsEntity
+import org.koitharu.kotatsu.core.db.entity.TagEntity
+
+data class SuggestionWithManga(
+	@Embedded val suggestion: SuggestionEntity,
+	@Relation(
+		parentColumn = "manga_id",
+		entityColumn = "manga_id"
+	)
+	val manga: MangaEntity,
+	@Relation(
+		parentColumn = "manga_id",
+		entityColumn = "tag_id",
+		associateBy = Junction(MangaTagsEntity::class)
+	)
+	val tags: List<TagEntity>
+)

app/src/main/java/org/koitharu/kotatsu/suggestions/domain/MangaSuggestion.kt

@@ -0,0 +1,10 @@
+package org.koitharu.kotatsu.suggestions.domain
+
+import androidx.annotation.FloatRange
+import org.koitharu.kotatsu.core.model.Manga
+
+data class MangaSuggestion(
+	val manga: Manga,
+	@FloatRange(from = 0.0, to = 1.0)
+	val relevance: Float,
+)

app/src/main/java/org/koitharu/kotatsu/suggestions/domain/SuggestionRepository.kt

@@ -0,0 +1,38 @@
+package org.koitharu.kotatsu.suggestions.domain
+
+import androidx.room.withTransaction
+import kotlinx.coroutines.flow.Flow
+import org.koitharu.kotatsu.core.db.MangaDatabase
+import org.koitharu.kotatsu.core.db.entity.MangaEntity
+import org.koitharu.kotatsu.core.db.entity.TagEntity
+import org.koitharu.kotatsu.core.model.Manga
+import org.koitharu.kotatsu.suggestions.data.SuggestionEntity
+import org.koitharu.kotatsu.utils.ext.mapItems
+import org.koitharu.kotatsu.utils.ext.mapToSet
+
+class SuggestionRepository(
+	private val db: MangaDatabase,
+) {
+
+	fun observeAll(): Flow<List<Manga>> {
+		return db.suggestionDao.observeAll().mapItems {
+			it.manga.toManga(it.tags.mapToSet(TagEntity::toMangaTag))
+		}
+	}
+
+	suspend fun replace(suggestions: Iterable<MangaSuggestion>) {
+		db.withTransaction {
+			db.suggestionDao.deleteAll()
+			suggestions.forEach { x ->
+				db.mangaDao.upsert(MangaEntity.from(x.manga))
+				db.suggestionDao.upsert(
+					SuggestionEntity(
+						mangaId = x.manga.id,
+						relevance = x.relevance,
+						createdAt = System.currentTimeMillis(),
+					)
+				)
+			}
+		}
+	}
+}

app/src/main/java/org/koitharu/kotatsu/suggestions/ui/SuggestionsFragment.kt

@@ -0,0 +1,28 @@
+package org.koitharu.kotatsu.suggestions.ui
+
+import android.os.Bundle
+import android.view.View
+import org.koin.androidx.viewmodel.ext.android.viewModel
+import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.list.ui.MangaListFragment
+
+class SuggestionsFragment : MangaListFragment() {
+
+	override val viewModel by viewModel<SuggestionsViewModel>(mode = LazyThreadSafetyMode.NONE)
+	override val isSwipeRefreshEnabled = false
+
+	override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+		super.onViewCreated(view, savedInstanceState)
+	}
+
+	override fun onScrolledToEnd() = Unit
+
+	override fun getTitle(): CharSequence? {
+		return context?.getString(R.string.suggestions)
+	}
+
+	companion object {
+
+		fun newInstance() = SuggestionsFragment()
+	}
+}

app/src/main/java/org/koitharu/kotatsu/suggestions/ui/SuggestionsViewModel.kt

@@ -0,0 +1,53 @@
+package org.koitharu.kotatsu.suggestions.ui
+
+import androidx.lifecycle.viewModelScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.catch
+import kotlinx.coroutines.flow.combine
+import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.core.model.Manga
+import org.koitharu.kotatsu.core.prefs.AppSettings
+import org.koitharu.kotatsu.core.prefs.ListMode
+import org.koitharu.kotatsu.list.ui.MangaListViewModel
+import org.koitharu.kotatsu.list.ui.model.*
+import org.koitharu.kotatsu.suggestions.domain.SuggestionRepository
+import org.koitharu.kotatsu.utils.ext.asLiveDataDistinct
+import org.koitharu.kotatsu.utils.ext.onFirst
+
+class SuggestionsViewModel(
+	repository: SuggestionRepository,
+	settings: AppSettings,
+) : MangaListViewModel(settings) {
+
+	override val content = combine(
+		repository.observeAll(),
+		createListModeFlow()
+	) { list, mode ->
+		when {
+			list.isEmpty() -> listOf(EmptyState(R.string.text_suggestion_holder))
+			else -> mapList(list, mode)
+		}
+	}.onFirst {
+		isLoading.postValue(false)
+	}.catch {
+		it.toErrorState(canRetry = false)
+	}.asLiveDataDistinct(
+		viewModelScope.coroutineContext + Dispatchers.Default,
+		listOf(LoadingState)
+	)
+
+	override fun onRefresh() = Unit
+
+	override fun onRetry() = Unit
+
+	private fun mapList(
+		list: List<Manga>,
+		mode: ListMode,
+	): List<ListModel> = list.map { manga ->
+		when (mode) {
+			ListMode.LIST -> manga.toListModel()
+			ListMode.DETAILED_LIST -> manga.toListDetailedModel()
+			ListMode.GRID -> manga.toGridModel()
+		}
+	}
+}

app/src/main/java/org/koitharu/kotatsu/suggestions/ui/SuggestionsWorker.kt

@@ -0,0 +1,68 @@
+package org.koitharu.kotatsu.suggestions.ui
+
+import android.content.Context
+import androidx.work.*
+import org.koin.core.component.KoinComponent
+import org.koin.core.component.inject
+import org.koitharu.kotatsu.core.model.Manga
+import org.koitharu.kotatsu.core.model.SortOrder
+import org.koitharu.kotatsu.history.domain.HistoryRepository
+import org.koitharu.kotatsu.suggestions.domain.MangaSuggestion
+import org.koitharu.kotatsu.suggestions.domain.SuggestionRepository
+import org.koitharu.kotatsu.utils.ext.mangaRepositoryOf
+import java.util.concurrent.TimeUnit
+import kotlin.math.pow
+
+class SuggestionsWorker(appContext: Context, params: WorkerParameters) :
+	CoroutineWorker(appContext, params), KoinComponent {
+
+	private val suggestionRepository by inject<SuggestionRepository>()
+	private val historyRepository by inject<HistoryRepository>()
+
+	override suspend fun doWork(): Result {
+		val rawResults = ArrayList<Manga>()
+		val allTags = historyRepository.getAllTags()
+		val tagsBySources = allTags.groupBy { x -> x.source }
+		for ((source, tags) in tagsBySources) {
+			val repo = mangaRepositoryOf(source)
+			tags.flatMapTo(rawResults) { tag ->
+				repo.getList(
+					offset = 0,
+					sortOrder = SortOrder.UPDATED,
+					tag = tag,
+				)
+			}
+		}
+		suggestionRepository.replace(
+			rawResults.distinctBy { manga ->
+				manga.id
+			}.map { manga ->
+				val jointTags = manga.tags intersect allTags
+				MangaSuggestion(
+					manga = manga,
+					relevance = (jointTags.size / manga.tags.size.toDouble()).pow(2.0).toFloat(),
+				)
+			}
+		)
+		return Result.success()
+	}
+
+	companion object {
+
+		private const val TAG = "suggestions"
+
+		fun setup(context: Context) {
+			val constraints = Constraints.Builder()
+				.setRequiredNetworkType(NetworkType.UNMETERED)
+				.setRequiresBatteryNotLow(true)
+				.build()
+			val request = PeriodicWorkRequestBuilder<SuggestionsWorker>(6, TimeUnit.HOURS)
+				.setConstraints(constraints)
+				.addTag(TAG)
+				.setBackoffCriteria(BackoffPolicy.LINEAR, 30, TimeUnit.MINUTES)
+				.build()
+			WorkManager.getInstance(context)
+				.enqueueUniquePeriodicWork(TAG, ExistingPeriodicWorkPolicy.KEEP, request)
+		}
+	}
+}

app/src/main/res/drawable/ic_suggestion.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	android:width="24dp"
+	android:height="24dp"
+	android:tint="?attr/colorControlNormal"
+	android:viewportWidth="24"
+	android:viewportHeight="24">
+	<path
+		android:fillColor="#000"
+		android:pathData="M12,2A7,7 0 0,1 19,9C19,11.38 17.81,13.47 16,14.74V17A1,1 0 0,1 15,18H9A1,1 0 0,1 8,17V14.74C6.19,13.47 5,11.38 5,9A7,7 0 0,1 12,2M9,21V20H15V21A1,1 0 0,1 14,22H10A1,1 0 0,1 9,21M12,4A5,5 0 0,0 7,9C7,11.05 8.23,12.81 10,13.58V16H14V13.58C15.77,12.81 17,11.05 17,9A5,5 0 0,0 12,4Z" />
+</vector>

app/src/main/res/menu/nav_drawer.xml

@@ -14,6 +14,10 @@
 			android:id="@+id/nav_history"
 			android:icon="@drawable/ic_history"
 			android:title="@string/history" />
+		<item
+			android:id="@+id/nav_suggestions"
+			android:icon="@drawable/ic_suggestion"
+			android:title="@string/suggestions" />
 		<item
 			android:id="@+id/nav_feed"
 			android:icon="@drawable/ic_feed"

app/src/main/res/values-ru/strings.xml

@@ -205,4 +205,6 @@
 	<string name="protect_application_subtitle">Enter password that will be required when the application starts</string>
 	<string name="confirm">Confirm</string>
 	<string name="password_length_hint">Password must be at least 4 characters</string>
+	<string name="suggestions">Suggestions</string>
+	<string name="text_suggestion_holder">Start reading manga and you will get personalized suggestions</string>
 </resources>

app/src/main/res/values/strings.xml

@@ -207,4 +207,6 @@
 	<string name="protect_application_subtitle">Enter password that will be required when the application starts</string>
 	<string name="confirm">Confirm</string>
 	<string name="password_length_hint">Password must be at least 4 characters</string>
+	<string name="suggestions">Suggestions</string>
+	<string name="text_suggestion_holder">Start reading manga and you will get personalized suggestions</string>
 </resources>