Option to open random manga from source

app/src/main/kotlin/org/koitharu/kotatsu/explore/domain/ExploreRepository.kt

@@ -7,6 +7,7 @@ import org.koitharu.kotatsu.core.util.ext.asArrayList
 import org.koitharu.kotatsu.core.util.ext.printStackTraceDebug
 import org.koitharu.kotatsu.explore.data.MangaSourcesRepository
 import org.koitharu.kotatsu.history.data.HistoryRepository
+import org.koitharu.kotatsu.parsers.model.ContentType
 import org.koitharu.kotatsu.parsers.model.Manga
 import org.koitharu.kotatsu.parsers.model.MangaSource
 import org.koitharu.kotatsu.parsers.util.runCatchingCancellable
@@ -21,19 +22,39 @@ class ExploreRepository @Inject constructor(
 ) {
 
 	suspend fun findRandomManga(tagsLimit: Int): Manga {
-		val blacklistTagRegex = TagsBlacklist(settings.suggestionsTagsBlacklist, 0.4f)
+		val tagsBlacklist = TagsBlacklist(settings.suggestionsTagsBlacklist, 0.4f)
 		val tags = historyRepository.getPopularTags(tagsLimit).mapNotNull {
-			if (it in blacklistTagRegex) null else it.title
+			if (it in tagsBlacklist) null else it.title
 		}
 		val sources = sourcesRepository.getEnabledSources()
 		check(sources.isNotEmpty()) { "No sources available" }
 		for (i in 0..4) {
-			val list = getList(sources.random(), tags, blacklistTagRegex)
+			val list = getList(sources.random(), tags, tagsBlacklist)
 			val manga = list.randomOrNull() ?: continue
 			val details = runCatchingCancellable {
 				mangaRepositoryFactory.create(manga.source).getDetails(manga)
 			}.getOrNull() ?: continue
-			if ((settings.isSuggestionsExcludeNsfw && details.isNsfw) || details in blacklistTagRegex) {
+			if ((settings.isSuggestionsExcludeNsfw && details.isNsfw) || details in tagsBlacklist) {
+				continue
+			}
+			return details
+		}
+		throw NoSuchElementException()
+	}
+
+	suspend fun findRandomManga(source: MangaSource, tagsLimit: Int): Manga {
+		val tagsBlacklist = TagsBlacklist(settings.suggestionsTagsBlacklist, 0.4f)
+		val skipNsfw = settings.isSuggestionsExcludeNsfw && source.contentType != ContentType.HENTAI
+		val tags = historyRepository.getPopularTags(tagsLimit).mapNotNull {
+			if (it in tagsBlacklist) null else it.title
+		}
+		for (i in 0..4) {
+			val list = getList(source, tags, tagsBlacklist)
+			val manga = list.randomOrNull() ?: continue
+			val details = runCatchingCancellable {
+				mangaRepositoryFactory.create(manga.source).getDetails(manga)
+			}.getOrNull() ?: continue
+			if ((skipNsfw && details.isNsfw) || details in tagsBlacklist) {
 				continue
 			}
 			return details

app/src/main/kotlin/org/koitharu/kotatsu/local/ui/LocalListViewModel.kt

@@ -11,6 +11,7 @@ import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.util.ext.MutableEventFlow
 import org.koitharu.kotatsu.core.util.ext.call
 import org.koitharu.kotatsu.download.ui.worker.DownloadWorker
+import org.koitharu.kotatsu.explore.domain.ExploreRepository
 import org.koitharu.kotatsu.filter.ui.FilterCoordinator
 import org.koitharu.kotatsu.list.domain.ListExtraProvider
 import org.koitharu.kotatsu.list.ui.model.EmptyState
@@ -29,6 +30,7 @@ class LocalListViewModel @Inject constructor(
 	downloadScheduler: DownloadWorker.Scheduler,
 	listExtraProvider: ListExtraProvider,
 	private val deleteLocalMangaUseCase: DeleteLocalMangaUseCase,
+	exploreRepository: ExploreRepository,
 	@LocalStorageChanges private val localStorageChanges: SharedFlow<LocalManga?>,
 ) : RemoteListViewModel(
 	savedStateHandle,
@@ -37,6 +39,7 @@ class LocalListViewModel @Inject constructor(
 	settings,
 	listExtraProvider,
 	downloadScheduler,
+	exploreRepository,
 ), SharedPreferences.OnSharedPreferenceChangeListener {
 
 	val onMangaRemoved = MutableEventFlow<Unit>()

app/src/main/kotlin/org/koitharu/kotatsu/remotelist/ui/RemoteListFragment.kt

@@ -12,9 +12,13 @@ import androidx.fragment.app.viewModels
 import dagger.hilt.android.AndroidEntryPoint
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.ui.list.ListSelectionController
+import org.koitharu.kotatsu.core.ui.util.MenuInvalidator
 import org.koitharu.kotatsu.core.util.ext.addMenuProvider
+import org.koitharu.kotatsu.core.util.ext.observe
+import org.koitharu.kotatsu.core.util.ext.observeEvent
 import org.koitharu.kotatsu.core.util.ext.withArgs
 import org.koitharu.kotatsu.databinding.FragmentListBinding
+import org.koitharu.kotatsu.details.ui.DetailsActivity
 import org.koitharu.kotatsu.filter.ui.FilterOwner
 import org.koitharu.kotatsu.filter.ui.FilterSheetFragment
 import org.koitharu.kotatsu.filter.ui.MangaFilter
@@ -35,6 +39,10 @@ class RemoteListFragment : MangaListFragment(), FilterOwner {
 	override fun onViewBindingCreated(binding: FragmentListBinding, savedInstanceState: Bundle?) {
 		super.onViewBindingCreated(binding, savedInstanceState)
 		addMenuProvider(RemoteListMenuProvider())
+		viewModel.isRandomLoading.observe(viewLifecycleOwner, MenuInvalidator(requireActivity()))
+		viewModel.onOpenManga.observeEvent(viewLifecycleOwner) {
+			startActivity(DetailsActivity.newIntent(binding.root.context, it))
+		}
 	}
 
 	override fun onScrolledToEnd() {
@@ -75,6 +83,11 @@ class RemoteListFragment : MangaListFragment(), FilterOwner {
 				true
 			}
 
+			R.id.action_random -> {
+				viewModel.openRandom()
+				true
+			}
+
 			R.id.action_filter -> {
 				onFilterClick(null)
 				true
@@ -83,6 +96,11 @@ class RemoteListFragment : MangaListFragment(), FilterOwner {
 			else -> false
 		}
 
+		override fun onPrepareMenu(menu: Menu) {
+			super.onPrepareMenu(menu)
+			menu.findItem(R.id.action_random)?.isEnabled = !viewModel.isRandomLoading.value
+		}
+
 		override fun onQueryTextSubmit(query: String?): Boolean {
 			if (query.isNullOrEmpty()) {
 				return false

app/src/main/kotlin/org/koitharu/kotatsu/remotelist/ui/RemoteListViewModel.kt

@@ -19,10 +19,12 @@ import kotlinx.coroutines.plus
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.parser.MangaRepository
 import org.koitharu.kotatsu.core.prefs.AppSettings
+import org.koitharu.kotatsu.core.util.ext.MutableEventFlow
 import org.koitharu.kotatsu.core.util.ext.call
 import org.koitharu.kotatsu.core.util.ext.printStackTraceDebug
 import org.koitharu.kotatsu.core.util.ext.require
 import org.koitharu.kotatsu.download.ui.worker.DownloadWorker
+import org.koitharu.kotatsu.explore.domain.ExploreRepository
 import org.koitharu.kotatsu.filter.ui.FilterCoordinator
 import org.koitharu.kotatsu.filter.ui.MangaFilter
 import org.koitharu.kotatsu.filter.ui.model.FilterState
@@ -49,14 +51,19 @@ open class RemoteListViewModel @Inject constructor(
 	settings: AppSettings,
 	listExtraProvider: ListExtraProvider,
 	downloadScheduler: DownloadWorker.Scheduler,
+	private val exploreRepository: ExploreRepository,
 ) : MangaListViewModel(settings, downloadScheduler), MangaFilter by filter {
 
 	val source = savedStateHandle.require<MangaSource>(RemoteListFragment.ARG_SOURCE)
+	val isRandomLoading = MutableStateFlow(false)
+	val onOpenManga = MutableEventFlow<Manga>()
+
 	private val repository = mangaRepositoryFactory.create(source)
 	private val mangaList = MutableStateFlow<List<Manga>?>(null)
 	private val hasNextPage = MutableStateFlow(false)
 	private val listError = MutableStateFlow<Throwable?>(null)
 	private var loadingJob: Job? = null
+	private var randomJob: Job? = null
 
 	override val content = combine(
 		mangaList,
@@ -149,4 +156,16 @@ open class RemoteListViewModel @Inject constructor(
 		textSecondary = 0,
 		actionStringRes = if (canResetFilter) R.string.reset_filter else 0,
 	)
+
+	fun openRandom() {
+		if (randomJob?.isActive == true) {
+			return
+		}
+		randomJob = launchLoadingJob(Dispatchers.Default) {
+			isRandomLoading.value = true
+			val manga = exploreRepository.findRandomManga(source, 16)
+			onOpenManga.call(manga)
+			isRandomLoading.value = false
+		}
+	}
 }

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

@@ -10,6 +10,12 @@
 		app:actionViewClass="androidx.appcompat.widget.SearchView"
 		app:showAsAction="ifRoom|collapseActionView" />
 
+	<item
+		android:id="@+id/action_random"
+		android:icon="@drawable/ic_dice"
+		android:title="@string/random"
+		app:showAsAction="ifRoom" />
+
 	<item
 		android:id="@+id/action_filter"
 		android:orderInCategory="30"