Action to remove read local chapters

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

@@ -27,7 +27,6 @@ import org.koitharu.kotatsu.explore.data.SourcesSortOrder
 import org.koitharu.kotatsu.list.domain.ListSortOrder
 import org.koitharu.kotatsu.parsers.model.SortOrder
 import org.koitharu.kotatsu.parsers.util.find
-import org.koitharu.kotatsu.parsers.util.isNumeric
 import org.koitharu.kotatsu.parsers.util.mapNotNullToSet
 import org.koitharu.kotatsu.parsers.util.mapToSet
 import org.koitharu.kotatsu.reader.domain.ReaderColorFilter
@@ -508,6 +507,7 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 		const val KEY_PAGES_CACHE_CLEAR = "pages_cache_clear"
 		const val KEY_HTTP_CACHE_CLEAR = "http_cache_clear"
 		const val KEY_COOKIES_CLEAR = "cookies_clear"
+		const val KEY_CHAPTERS_CLEAR = "chapters_clear"
 		const val KEY_THUMBS_CACHE_CLEAR = "thumbs_cache_clear"
 		const val KEY_SEARCH_HISTORY_CLEAR = "search_history_clear"
 		const val KEY_UPDATES_FEED_CLEAR = "updates_feed_clear"

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

@@ -17,6 +17,7 @@ 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.chip.Chip
 import com.google.android.material.progressindicator.BaseProgressIndicator
 import com.google.android.material.slider.Slider
 import com.google.android.material.tabs.TabLayout
@@ -169,3 +170,11 @@ fun MaterialButton.setProgressIcon() {
 	icon = progressDrawable
 	progressDrawable.start()
 }
+
+fun Chip.setProgressIcon() {
+	val progressDrawable = CircularProgressDrawable(context)
+	progressDrawable.strokeWidth = resources.resolveDp(2f)
+	progressDrawable.setColorSchemeColors(currentTextColor)
+	chipIcon = progressDrawable
+	progressDrawable.start()
+}

app/src/main/kotlin/org/koitharu/kotatsu/local/domain/DeleteReadChaptersUseCase.kt

@@ -0,0 +1,96 @@
+package org.koitharu.kotatsu.local.domain
+
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.buffer
+import kotlinx.coroutines.flow.channelFlow
+import kotlinx.coroutines.flow.fold
+import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.launch
+import org.koitharu.kotatsu.core.model.findById
+import org.koitharu.kotatsu.core.model.ids
+import org.koitharu.kotatsu.core.model.isLocal
+import org.koitharu.kotatsu.core.util.ext.printStackTraceDebug
+import org.koitharu.kotatsu.history.data.HistoryRepository
+import org.koitharu.kotatsu.local.data.LocalMangaRepository
+import org.koitharu.kotatsu.local.data.LocalStorageChanges
+import org.koitharu.kotatsu.local.domain.model.LocalManga
+import org.koitharu.kotatsu.parsers.model.Manga
+import org.koitharu.kotatsu.parsers.util.runCatchingCancellable
+import javax.inject.Inject
+
+class DeleteReadChaptersUseCase @Inject constructor(
+	private val localMangaRepository: LocalMangaRepository,
+	private val historyRepository: HistoryRepository,
+	@LocalStorageChanges private val localStorageChanges: MutableSharedFlow<LocalManga?>,
+) {
+
+	suspend operator fun invoke(manga: Manga): Int {
+		val localManga = if (manga.isLocal) {
+			LocalManga(manga)
+		} else {
+			checkNotNull(localMangaRepository.findSavedManga(manga)) { "Cannot find local manga" }
+		}
+		val task = getDeletionTask(localManga) ?: return 0
+		localMangaRepository.deleteChapters(task.manga.manga, task.chaptersIds)
+		emitUpdate(localManga)
+		return task.chaptersIds.size
+	}
+
+	suspend operator fun invoke(): Int {
+		val list = localMangaRepository.getList(0, null)
+		if (list.isEmpty()) {
+			return 0
+		}
+		return channelFlow {
+			for (manga in list) {
+				launch(Dispatchers.Default) {
+					val task = runCatchingCancellable {
+						getDeletionTask(LocalManga(manga))
+					}.onFailure {
+						it.printStackTraceDebug()
+					}.getOrNull()
+					if (task != null) {
+						send(task)
+					}
+				}
+			}
+		}.buffer().map {
+			runCatchingCancellable {
+				localMangaRepository.deleteChapters(it.manga.manga, it.chaptersIds)
+				emitUpdate(it.manga)
+				it.chaptersIds.size
+			}.onFailure {
+				it.printStackTraceDebug()
+			}.getOrDefault(0)
+		}.fold(0) { acc, x -> acc + x }
+	}
+
+	private suspend fun getDeletionTask(manga: LocalManga): DeletionTask? {
+		val history = historyRepository.getOne(manga.manga) ?: return null
+		val chapters = manga.manga.chapters ?: localMangaRepository.getDetails(manga.manga).chapters
+		if (chapters.isNullOrEmpty()) {
+			return null
+		}
+		val branch = (chapters.findById(history.chapterId) ?: return null).branch
+		val filteredChapters = manga.manga.getChapters(branch)?.takeWhile { it.id != history.chapterId }
+		return if (filteredChapters.isNullOrEmpty()) {
+			null
+		} else {
+			DeletionTask(
+				manga = manga,
+				chaptersIds = filteredChapters.ids(),
+			)
+		}
+	}
+
+	private suspend fun emitUpdate(subject: LocalManga) {
+		val updated = localMangaRepository.getDetails(subject.manga)
+		localStorageChanges.emit(subject.copy(manga = updated))
+	}
+
+	private class DeletionTask(
+		val manga: LocalManga,
+		val chaptersIds: Set<Long>,
+	)
+}

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

@@ -3,7 +3,9 @@ package org.koitharu.kotatsu.local.ui.info
 import android.content.res.ColorStateList
 import android.os.Bundle
 import android.view.LayoutInflater
+import android.view.View
 import android.view.ViewGroup
+import android.widget.Toast
 import androidx.core.widget.TextViewCompat
 import androidx.fragment.app.FragmentManager
 import androidx.fragment.app.viewModels
@@ -14,9 +16,11 @@ import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.model.parcelable.ParcelableManga
 import org.koitharu.kotatsu.core.ui.AlertDialogFragment
 import org.koitharu.kotatsu.core.ui.widgets.SegmentedBarView
-import org.koitharu.kotatsu.core.util.KotatsuColors
 import org.koitharu.kotatsu.core.util.FileSize
+import org.koitharu.kotatsu.core.util.KotatsuColors
 import org.koitharu.kotatsu.core.util.ext.observe
+import org.koitharu.kotatsu.core.util.ext.observeEvent
+import org.koitharu.kotatsu.core.util.ext.setProgressIcon
 import org.koitharu.kotatsu.core.util.ext.showDistinct
 import org.koitharu.kotatsu.core.util.ext.withArgs
 import org.koitharu.kotatsu.databinding.DialogLocalInfoBinding
@@ -24,14 +28,12 @@ import org.koitharu.kotatsu.parsers.model.Manga
 import com.google.android.material.R as materialR
 
 @AndroidEntryPoint
-class LocalInfoDialog : AlertDialogFragment<DialogLocalInfoBinding>() {
+class LocalInfoDialog : AlertDialogFragment<DialogLocalInfoBinding>(), View.OnClickListener {
 
 	private val viewModel: LocalInfoViewModel by viewModels()
 
 	override fun onBuildDialog(builder: MaterialAlertDialogBuilder): MaterialAlertDialogBuilder {
-		return super.onBuildDialog(builder)
-			.setTitle(R.string.saved_manga)
-			.setNegativeButton(R.string.close, null)
+		return super.onBuildDialog(builder).setTitle(R.string.saved_manga).setNegativeButton(R.string.close, null)
 	}
 
 	override fun onCreateViewBinding(inflater: LayoutInflater, container: ViewGroup?): DialogLocalInfoBinding {
@@ -43,13 +45,44 @@ class LocalInfoDialog : AlertDialogFragment<DialogLocalInfoBinding>() {
 		viewModel.path.observe(this) {
 			binding.textViewPath.text = it
 		}
-		combine(viewModel.size, viewModel.availableSize, ::Pair).observe(this) {
+		binding.chipCleanup.setOnClickListener(this)
+		combine(viewModel.size, viewModel.availableSize, ::Pair).observe(viewLifecycleOwner) {
 			if (it.first >= 0 && it.second >= 0) {
 				setSegments(it.first, it.second)
 			} else {
 				binding.barView.animateSegments(emptyList())
 			}
 		}
+		viewModel.onCleanedUp.observeEvent(viewLifecycleOwner, ::onCleanedUp)
+		viewModel.isCleaningUp.observe(viewLifecycleOwner) { loading ->
+			binding.chipCleanup.isClickable = !loading
+			dialog?.setCancelable(!loading)
+			if (loading) {
+				binding.chipCleanup.setProgressIcon()
+			} else {
+				binding.chipCleanup.setChipIconResource(R.drawable.ic_delete)
+			}
+		}
+	}
+
+	override fun onClick(v: View) {
+		when (v.id) {
+			R.id.chip_cleanup -> viewModel.cleanup()
+		}
+	}
+
+	private fun onCleanedUp(result: Pair<Int, Long>) {
+		val c = context ?: return
+		val text = if (result.first == 0 && result.second == 0L) {
+			c.getString(R.string.no_chapters_deleted)
+		} else {
+			c.getString(
+				R.string.chapters_deleted_pattern,
+				c.resources.getQuantityString(R.plurals.chapters, result.first, result.first),
+				FileSize.BYTES.format(c, result.second),
+			)
+		}
+		Toast.makeText(c, text, Toast.LENGTH_SHORT).show()
 	}
 
 	private fun setSegments(size: Long, available: Long) {

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

@@ -1,6 +1,5 @@
 package org.koitharu.kotatsu.local.ui.info
 
-import androidx.core.net.toFile
 import androidx.core.net.toUri
 import androidx.lifecycle.SavedStateHandle
 import dagger.hilt.android.lifecycle.HiltViewModel
@@ -8,12 +7,14 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.MutableStateFlow
 import org.koitharu.kotatsu.core.model.parcelable.ParcelableManga
 import org.koitharu.kotatsu.core.ui.BaseViewModel
-import org.koitharu.kotatsu.core.ui.widgets.SegmentedBarView
+import org.koitharu.kotatsu.core.util.ext.MutableEventFlow
+import org.koitharu.kotatsu.core.util.ext.call
 import org.koitharu.kotatsu.core.util.ext.computeSize
 import org.koitharu.kotatsu.core.util.ext.require
 import org.koitharu.kotatsu.core.util.ext.toFileOrNull
 import org.koitharu.kotatsu.local.data.LocalMangaRepository
 import org.koitharu.kotatsu.local.data.LocalStorageManager
+import org.koitharu.kotatsu.local.domain.DeleteReadChaptersUseCase
 import javax.inject.Inject
 
 @HiltViewModel
@@ -21,21 +22,42 @@ class LocalInfoViewModel @Inject constructor(
 	savedStateHandle: SavedStateHandle,
 	private val localMangaRepository: LocalMangaRepository,
 	private val storageManager: LocalStorageManager,
+	private val deleteReadChaptersUseCase: DeleteReadChaptersUseCase,
 ) : BaseViewModel() {
 
 	private val manga = savedStateHandle.require<ParcelableManga>(LocalInfoDialog.ARG_MANGA).manga
 
+	val isCleaningUp = MutableStateFlow(false)
+	val onCleanedUp = MutableEventFlow<Pair<Int, Long>>()
+
 	val path = MutableStateFlow<String?>(null)
 	val size = MutableStateFlow(-1L)
 	val availableSize = MutableStateFlow(-1L)
 
 	init {
-		launchLoadingJob(Dispatchers.Default) {
-			val file = manga.url.toUri().toFileOrNull() ?: localMangaRepository.findSavedManga(manga)?.file
-			requireNotNull(file)
-			path.value = file.path
-			size.value = file.computeSize()
-			availableSize.value = storageManager.computeAvailableSize()
+		computeSize()
+	}
+
+	fun cleanup() {
+		launchJob(Dispatchers.Default) {
+			try {
+				isCleaningUp.value = true
+				val oldSize = size.value
+				val chaptersCount = deleteReadChaptersUseCase.invoke(manga)
+				computeSize().join()
+				val newSize = size.value
+				onCleanedUp.call(chaptersCount to oldSize - newSize)
+			} finally {
+				isCleaningUp.value = false
+			}
 		}
 	}
+
+	private fun computeSize() = launchLoadingJob(Dispatchers.Default) {
+		val file = manga.url.toUri().toFileOrNull() ?: localMangaRepository.findSavedManga(manga)?.file
+		requireNotNull(file)
+		path.value = file.path
+		size.value = file.computeSize()
+		availableSize.value = storageManager.computeAvailableSize()
+	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/settings/userdata/UserDataSettingsFragment.kt

@@ -94,6 +94,7 @@ class UserDataSettingsFragment : BasePreferenceFragment(R.string.data_and_privac
 		}
 		viewModel.onError.observeEvent(viewLifecycleOwner, SnackbarErrorObserver(listView, this))
 		viewModel.onActionDone.observeEvent(viewLifecycleOwner, ReversibleActionObserver(listView))
+		viewModel.onChaptersCleanedUp.observeEvent(viewLifecycleOwner, ::onChaptersCleanedUp)
 		settings.subscribe(this)
 	}
 
@@ -129,6 +130,11 @@ class UserDataSettingsFragment : BasePreferenceFragment(R.string.data_and_privac
 				true
 			}
 
+			AppSettings.KEY_CHAPTERS_CLEAR -> {
+				cleanupChapters()
+				true
+			}
+
 			AppSettings.KEY_UPDATES_FEED_CLEAR -> {
 				viewModel.clearUpdatesFeed()
 				true
@@ -191,6 +197,21 @@ class UserDataSettingsFragment : BasePreferenceFragment(R.string.data_and_privac
 		}
 	}
 
+	private fun onChaptersCleanedUp(result: Pair<Int, Long>) {
+		val c = context ?: return
+		val text = if (result.first == 0 && result.second == 0L) {
+			c.getString(R.string.no_chapters_deleted)
+		} else {
+			c.getString(
+				R.string.chapters_deleted_pattern,
+				c.resources.getQuantityString(R.plurals.chapters, result.first, result.first),
+				FileSize.BYTES.format(c, result.second),
+			)
+		}
+		Snackbar.make(listView, text, Snackbar.LENGTH_SHORT).show()
+	}
+
+
 	private fun Preference.bindBytesSizeSummary(stateFlow: StateFlow<Long>) {
 		stateFlow.observe(viewLifecycleOwner) { size ->
 			summary = if (size < 0) {
@@ -235,6 +256,16 @@ class UserDataSettingsFragment : BasePreferenceFragment(R.string.data_and_privac
 			}.show()
 	}
 
+	private fun cleanupChapters() {
+		MaterialAlertDialogBuilder(context ?: return)
+			.setTitle(R.string.delete_read_chapters)
+			.setMessage(R.string.delete_read_chapters_prompt)
+			.setNegativeButton(android.R.string.cancel, null)
+			.setPositiveButton(R.string.delete) { _, _ ->
+				viewModel.cleanupChapters()
+			}.show()
+	}
+
 	private fun postRestart() {
 		view?.postDelayed(400) {
 			activityRecreationHandle.recreateAll()

app/src/main/kotlin/org/koitharu/kotatsu/settings/userdata/UserDataSettingsViewModel.kt

@@ -18,8 +18,10 @@ 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.firstNotNull
 import org.koitharu.kotatsu.local.data.CacheDir
 import org.koitharu.kotatsu.local.data.LocalStorageManager
+import org.koitharu.kotatsu.local.domain.DeleteReadChaptersUseCase
 import org.koitharu.kotatsu.search.domain.MangaSearchRepository
 import org.koitharu.kotatsu.tracker.domain.TrackingRepository
 import java.util.EnumMap
@@ -33,6 +35,7 @@ class UserDataSettingsViewModel @Inject constructor(
 	private val trackingRepository: TrackingRepository,
 	private val cookieJar: MutableCookieJar,
 	private val settings: AppSettings,
+	private val deleteReadChaptersUseCase: DeleteReadChaptersUseCase,
 ) : BaseViewModel() {
 
 	val onActionDone = MutableEventFlow<ReversibleAction>()
@@ -44,6 +47,8 @@ class UserDataSettingsViewModel @Inject constructor(
 	val cacheSizes = EnumMap<CacheDir, MutableStateFlow<Long>>(CacheDir::class.java)
 	val storageUsage = MutableStateFlow<StorageUsage?>(null)
 
+	val onChaptersCleanedUp = MutableEventFlow<Pair<Int, Long>>()
+
 	val periodicalBackupFrequency = settings.observeAsFlow(
 		key = AppSettings.KEY_BACKUP_PERIODICAL_ENABLED,
 		valueProducer = { isPeriodicalBackupEnabled },
@@ -133,9 +138,24 @@ class UserDataSettingsViewModel @Inject constructor(
 		}
 	}
 
-	private fun loadStorageUsage() {
+	fun cleanupChapters() {
+		launchJob(Dispatchers.Default) {
+			try {
+				loadingKeys.update { it + AppSettings.KEY_CHAPTERS_CLEAR }
+				val oldSize = storageUsage.firstNotNull().savedManga.bytes
+				val chaptersCount = deleteReadChaptersUseCase.invoke()
+				loadStorageUsage().join()
+				val newSize = storageUsage.firstNotNull().savedManga.bytes
+				onChaptersCleanedUp.call(chaptersCount to oldSize - newSize)
+			} finally {
+				loadingKeys.update { it - AppSettings.KEY_CHAPTERS_CLEAR }
+			}
+		}
+	}
+
+	private fun loadStorageUsage(): Job {
 		val prevJob = storageUsageJob
-		storageUsageJob = launchJob(Dispatchers.Default) {
+		return launchJob(Dispatchers.Default) {
 			prevJob?.cancelAndJoin()
 			val pagesCacheSize = storageManager.computeCacheSize(CacheDir.PAGES)
 			val otherCacheSize = storageManager.computeCacheSize() - pagesCacheSize
@@ -160,6 +180,8 @@ class UserDataSettingsViewModel @Inject constructor(
 					percent = (availableSpace.toDouble() / totalBytes).toFloat(),
 				),
 			)
+		}.also {
+			storageUsageJob = it
 		}
 	}
 }

app/src/main/res/layout/dialog_local_info.xml

@@ -6,7 +6,8 @@
 	android:layout_width="match_parent"
 	android:layout_height="wrap_content"
 	android:orientation="vertical"
-	android:padding="?dialogPreferredPadding">
+	android:paddingHorizontal="?dialogPreferredPadding"
+	android:paddingTop="?dialogPreferredPadding">
 
 	<TextView
 		android:id="@+id/textView_path_label"
@@ -51,4 +52,13 @@
 		app:drawableStartCompat="@drawable/bg_rounded_square"
 		app:drawableTint="?colorSecondaryContainer" />
 
+	<com.google.android.material.chip.Chip
+		android:id="@+id/chip_cleanup"
+		style="@style/Widget.Kotatsu.Chip.Assist"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_marginTop="12dp"
+		android:text="@string/delete_read_chapters"
+		app:chipIcon="@drawable/ic_delete" />
+
 </LinearLayout>

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

@@ -623,4 +623,9 @@
 	<string name="migrate_confirmation">Manga \"%1$s\" from \"%2$s\" will be replaced with \"%3$s\" from \"%4$s\" in your history and favorites (if present)</string>
 	<string name="manga_migration">Manga migration</string>
 	<string name="migration_completed">Migration completed</string>
+	<string name="delete_read_chapters">Delete read chapters</string>
+	<string name="no_chapters_deleted">No chapters have been deleted</string>
+	<string name="chapters_deleted_pattern">Removed %1$s, cleared %2$s</string>
+	<string name="delete_read_chapters_summary">Delete chapters you have already read from local storage to free up space</string>
+	<string name="delete_read_chapters_prompt">This will permanently delete all chapters marked as read from your local storage. You can re-download it later, but the imported chapters may be lost forever</string>
 </resources>

app/src/main/res/xml/pref_user_data.xml

@@ -83,6 +83,12 @@
 			android:summary="@string/clear_cookies_summary"
 			android:title="@string/clear_cookies" />
 
+		<Preference
+			android:key="chapters_clear"
+			android:persistent="false"
+			android:summary="@string/delete_read_chapters_summary"
+			android:title="@string/delete_read_chapters" />
+
 	</PreferenceCategory>
 
 </PreferenceScreen>