Invalidate manga cache on config changes

app/src/main/kotlin/org/koitharu/kotatsu/alternatives/domain/AlternativesUseCase.kt

@@ -42,7 +42,7 @@ class AlternativesUseCase @Inject constructor(
 						}
 					}.getOrDefault(emptyList())
 					for (item in list) {
-						if (item != manga && item.matches(manga)) {
+						if (item.matches(manga)) {
 							send(item)
 						}
 					}

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

@@ -20,6 +20,8 @@ interface ContentCache {
 
 	fun putRelatedManga(source: MangaSource, url: String, related: SafeDeferred<List<Manga>>)
 
+	fun clear(source: MangaSource)
+
 	data class Key(
 		val source: MangaSource,
 		val url: String,

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

@@ -7,10 +7,12 @@ class ExpiringLruCache<T>(
 	val maxSize: Int,
 	private val lifetime: Long,
 	private val timeUnit: TimeUnit,
-) {
+) : Iterable<ContentCache.Key> {
 
 	private val cache = LruCache<ContentCache.Key, ExpiringValue<T>>(maxSize)
 
+	override fun iterator(): Iterator<ContentCache.Key> = cache.snapshot().keys.iterator()
+
 	operator fun get(key: ContentCache.Key): T? {
 		val value = cache[key] ?: return null
 		if (value.isExpired) {
@@ -30,4 +32,8 @@ class ExpiringLruCache<T>(
 	fun trimToSize(size: Int) {
 		cache.trimToSize(size)
 	}
+
+	fun remove(key: ContentCache.Key) {
+		cache.remove(key)
+	}
 }

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

@@ -44,6 +44,12 @@ class MemoryContentCache(application: Application) : ContentCache, ComponentCall
 		relatedMangaCache[ContentCache.Key(source, url)] = related
 	}
 
+	override fun clear(source: MangaSource) {
+		clearCache(detailsCache, source)
+		clearCache(pagesCache, source)
+		clearCache(relatedMangaCache, source)
+	}
+
 	override fun onConfigurationChanged(newConfig: Configuration) = Unit
 
 	override fun onLowMemory() = Unit
@@ -67,4 +73,12 @@ class MemoryContentCache(application: Application) : ContentCache, ComponentCall
 			else -> cache.trimToSize(cache.maxSize / 2)
 		}
 	}
+
+	private fun clearCache(cache: ExpiringLruCache<*>, source: MangaSource) {
+		cache.forEach { key ->
+			if (key.source == source) {
+				cache.remove(key)
+			}
+		}
+	}
 }

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

@@ -19,4 +19,6 @@ class StubContentCache : ContentCache {
 	override suspend fun getRelatedManga(source: MangaSource, url: String): List<Manga>? = null
 
 	override fun putRelatedManga(source: MangaSource, url: String, related: SafeDeferred<List<Manga>>) = Unit
+
+	override fun clear(source: MangaSource) = Unit
 }

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

@@ -171,7 +171,11 @@ class RemoteMangaRepository(
 		return getConfig().isSlowdownEnabled
 	}
 
-	private fun getConfig() = parser.config as SourceSettings
+	fun invalidateCache() {
+		cache.clear(source)
+	}
+
+	fun getConfig() = parser.config as SourceSettings
 
 	private suspend fun <T> asyncSafe(block: suspend CoroutineScope.() -> T): SafeDeferred<T> {
 		var dispatcher = currentCoroutineContext()[CoroutineDispatcher.Key]

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

@@ -1,6 +1,7 @@
 package org.koitharu.kotatsu.core.prefs
 
 import android.content.Context
+import android.content.SharedPreferences.OnSharedPreferenceChangeListener
 import androidx.core.content.edit
 import org.koitharu.kotatsu.core.util.ext.getEnumValue
 import org.koitharu.kotatsu.core.util.ext.ifNullOrEmpty
@@ -10,9 +11,6 @@ import org.koitharu.kotatsu.parsers.config.MangaSourceConfig
 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 {
 
 	private val prefs = context.getSharedPreferences(source.name, Context.MODE_PRIVATE)
@@ -42,4 +40,18 @@ class SourceSettings(context: Context, source: MangaSource) : MangaSourceConfig
 			is ConfigKey.SplitByTranslations -> putBoolean(key.key, value as Boolean)
 		}
 	}
+
+	fun subscribe(listener: OnSharedPreferenceChangeListener) {
+		prefs.registerOnSharedPreferenceChangeListener(listener)
+	}
+
+	fun unsubscribe(listener: OnSharedPreferenceChangeListener) {
+		prefs.unregisterOnSharedPreferenceChangeListener(listener)
+	}
+
+	companion object {
+
+		const val KEY_SORT_ORDER = "sort_order"
+		const val KEY_SLOWDOWN = "slowdown"
+	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/settings/sources/SourceSettingsViewModel.kt

@@ -1,5 +1,6 @@
 package org.koitharu.kotatsu.settings.sources
 
+import android.content.SharedPreferences
 import androidx.lifecycle.SavedStateHandle
 import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.Dispatchers
@@ -10,11 +11,13 @@ import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.network.cookies.MutableCookieJar
 import org.koitharu.kotatsu.core.parser.MangaRepository
 import org.koitharu.kotatsu.core.parser.RemoteMangaRepository
+import org.koitharu.kotatsu.core.prefs.SourceSettings
 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.require
+import org.koitharu.kotatsu.parsers.config.ConfigKey
 import org.koitharu.kotatsu.parsers.exception.AuthRequiredException
 import org.koitharu.kotatsu.parsers.model.MangaSource
 import javax.inject.Inject
@@ -24,7 +27,7 @@ class SourceSettingsViewModel @Inject constructor(
 	savedStateHandle: SavedStateHandle,
 	mangaRepositoryFactory: MangaRepository.Factory,
 	private val cookieJar: MutableCookieJar,
-) : BaseViewModel() {
+) : BaseViewModel(), SharedPreferences.OnSharedPreferenceChangeListener {
 
 	val source = savedStateHandle.require<MangaSource>(SourceSettingsFragment.EXTRA_SOURCE)
 	val repository = mangaRepositoryFactory.create(source) as RemoteMangaRepository
@@ -34,9 +37,21 @@ class SourceSettingsViewModel @Inject constructor(
 	private var usernameLoadJob: Job? = null
 
 	init {
+		repository.getConfig().subscribe(this)
 		loadUsername()
 	}
 
+	override fun onCleared() {
+		repository.getConfig().unsubscribe(this)
+		super.onCleared()
+	}
+
+	override fun onSharedPreferenceChanged(sharedPreferences: SharedPreferences?, key: String?) {
+		if (key != SourceSettings.KEY_SLOWDOWN && key != SourceSettings.KEY_SORT_ORDER) {
+			repository.invalidateCache()
+		}
+	}
+
 	fun onResume() {
 		if (usernameLoadJob?.isActive != true) {
 			loadUsername()