Show related manga

app/src/main/java/org/koitharu/kotatsu/ui/details/MangaDetailsActivity.kt

@@ -188,6 +188,7 @@ class MangaDetailsActivity : BaseActivity(), MangaDetailsView,
 		tab.text = when (position) {
 			0 -> getString(R.string.details)
 			1 -> getString(R.string.chapters)
+			2 -> getString(R.string.related)
 			else -> null
 		}
 	}

app/src/main/java/org/koitharu/kotatsu/ui/details/MangaDetailsAdapter.kt

@@ -6,11 +6,12 @@ import androidx.viewpager2.adapter.FragmentStateAdapter
 
 class MangaDetailsAdapter(activity: FragmentActivity) : FragmentStateAdapter(activity) {
 
-	override fun getItemCount() = 2
+	override fun getItemCount() = 3
 
 	override fun createFragment(position: Int): Fragment = when(position) {
 		0 -> MangaDetailsFragment()
 		1 -> ChaptersFragment()
+		2 -> RelatedMangaFragment()
 		else -> throw IndexOutOfBoundsException("No fragment for position $position")
 	}
 }

app/src/main/java/org/koitharu/kotatsu/ui/details/MangaDetailsPresenter.kt

@@ -2,6 +2,7 @@ package org.koitharu.kotatsu.ui.details
 
 import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.*
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import moxy.InjectViewState
@@ -13,6 +14,7 @@ import org.koitharu.kotatsu.core.model.MangaSource
 import org.koitharu.kotatsu.core.parser.LocalMangaRepository
 import org.koitharu.kotatsu.domain.MangaDataRepository
 import org.koitharu.kotatsu.domain.MangaProviderFactory
+import org.koitharu.kotatsu.domain.MangaSearchRepository
 import org.koitharu.kotatsu.domain.favourites.FavouritesRepository
 import org.koitharu.kotatsu.domain.favourites.OnFavouritesChangeListener
 import org.koitharu.kotatsu.domain.history.HistoryRepository
@@ -30,6 +32,7 @@ class MangaDetailsPresenter private constructor() : BasePresenter<MangaDetailsVi
 	private lateinit var historyRepository: HistoryRepository
 	private lateinit var favouritesRepository: FavouritesRepository
 	private lateinit var trackingRepository: TrackingRepository
+	private lateinit var searchRepository: MangaSearchRepository
 
 	private var manga: Manga? = null
 
@@ -37,6 +40,7 @@ class MangaDetailsPresenter private constructor() : BasePresenter<MangaDetailsVi
 		historyRepository = HistoryRepository()
 		favouritesRepository = FavouritesRepository()
 		trackingRepository = TrackingRepository()
+		searchRepository = MangaSearchRepository()
 		super.onFirstViewAttach()
 		HistoryRepository.subscribe(this)
 		FavouritesRepository.subscribe(this)
@@ -147,6 +151,38 @@ class MangaDetailsPresenter private constructor() : BasePresenter<MangaDetailsVi
 		}
 	}
 
+	fun loadRelated() {
+		val manga = this.manga ?: return
+		presenterScope.launch {
+			viewState.onLoadingStateChanged(isLoading = true)
+			var isFirstCall = true
+			searchRepository.globalSearch(manga.title)
+				.map { list ->
+					list.filter { x -> x.id != manga.id }
+				}.filterNot { x -> x.isEmpty() }
+				.flowOn(Dispatchers.IO)
+				.catch { e ->
+					if (e is IOException) {
+						viewState.onError(e)
+					}
+				}
+				.onEmpty {
+					viewState.onListChanged(emptyList())
+					viewState.onLoadingStateChanged(isLoading = false)
+				}.onCompletion {
+					viewState.onListAppended(emptyList())
+				}.collect {
+					if (isFirstCall) {
+						isFirstCall = false
+						viewState.onListChanged(it)
+						viewState.onLoadingStateChanged(isLoading = false)
+					} else {
+						viewState.onListAppended(it)
+					}
+				}
+		}
+	}
+
 	override fun onHistoryChanged() {
 		loadHistory(manga ?: return)
 	}

app/src/main/java/org/koitharu/kotatsu/ui/details/MangaDetailsView.kt

@@ -1,5 +1,8 @@
 package org.koitharu.kotatsu.ui.details
 
+import moxy.viewstate.strategy.AddToEndSingleTagStrategy
+import moxy.viewstate.strategy.AddToEndStrategy
+import moxy.viewstate.strategy.StateStrategyType
 import moxy.viewstate.strategy.alias.AddToEndSingle
 import moxy.viewstate.strategy.alias.SingleState
 import org.koitharu.kotatsu.core.model.FavouriteCategory
@@ -23,4 +26,13 @@ interface MangaDetailsView : BaseMvpView {
 
 	@AddToEndSingle
 	fun onNewChaptersChanged(newChapters: Int)
+
+	@StateStrategyType(AddToEndSingleTagStrategy::class, tag = "content")
+	fun onListChanged(list: List<Manga>) = Unit
+
+	@StateStrategyType(AddToEndStrategy::class, tag = "content")
+	fun onListAppended(list: List<Manga>) = Unit
+
+	@StateStrategyType(AddToEndSingleTagStrategy::class, tag = "content")
+	fun onListError(e: Throwable) = Unit
 }

app/src/main/java/org/koitharu/kotatsu/ui/details/RelatedMangaFragment.kt

@@ -0,0 +1,34 @@
+package org.koitharu.kotatsu.ui.details
+
+import moxy.ktx.moxyPresenter
+import org.koitharu.kotatsu.core.model.FavouriteCategory
+import org.koitharu.kotatsu.core.model.Manga
+import org.koitharu.kotatsu.core.model.MangaHistory
+import org.koitharu.kotatsu.ui.list.MangaListFragment
+
+class RelatedMangaFragment : MangaListFragment<Unit>(), MangaDetailsView {
+
+	private val presenter by moxyPresenter(factory = MangaDetailsPresenter.Companion::getInstance)
+
+	override fun onRequestMoreItems(offset: Int) {
+		if (offset == 0) {
+			presenter.loadRelated()
+		}
+	}
+
+	override fun onMangaUpdated(manga: Manga) = Unit
+
+	override fun onHistoryChanged(history: MangaHistory?) = Unit
+
+	override fun onFavouriteChanged(categories: List<FavouriteCategory>) = Unit
+
+	override fun onMangaRemoved(manga: Manga) = Unit
+
+	override fun onNewChaptersChanged(newChapters: Int) = Unit
+
+	override fun onListChanged(list: List<Manga>) = super<MangaListFragment>.onListChanged(list)
+
+	override fun onListAppended(list: List<Manga>) = super<MangaListFragment>.onListAppended(list)
+
+	override fun onListError(e: Throwable) = super<MangaListFragment>.onListError(e)
+}

app/src/main/java/org/koitharu/kotatsu/ui/search/global/GlobalSearchPresenter.kt

@@ -18,7 +18,6 @@ class GlobalSearchPresenter : BasePresenter<MangaListView<Unit>>() {
 		super.onFirstViewAttach()
 	}
 
-	@Suppress("EXPERIMENTAL_API_USAGE")
 	fun startSearch(query: String) {
 		presenterScope.launch {
 			viewState.onLoadingStateChanged(isLoading = true)

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

@@ -134,6 +134,7 @@
 	<string name="favourites_category_empty">В этой категории ничего нет</string>
 	<string name="read_later">Прочитать позже</string>
 	<string name="updates">Обновления</string>
-	<string name="text_feed_holder">Here you will see manga updates</string>
+	<string name="text_feed_holder">Здесь будут отображаться обновления манги, которую Вы читаете</string>
 	<string name="search_results">Результаты поиска</string>
+	<string name="related">Похожие</string>
 </resources>

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

@@ -135,6 +135,7 @@
 	<string name="favourites_category_empty">This category is empty</string>
 	<string name="read_later">Read later</string>
 	<string name="updates">Updates</string>
-	<string name="text_feed_holder">Here you will see manga updates</string>
+	<string name="text_feed_holder">Here you will see the new chapters of the manga you are reading</string>
 	<string name="search_results">Search results</string>
+	<string name="related">Related</string>
 </resources>