Delete local chapters in a service

app/src/main/AndroidManifest.xml

@@ -102,6 +102,7 @@
 		<service
 			android:name="org.koitharu.kotatsu.download.ui.service.DownloadService"
 			android:foregroundServiceType="dataSync" />
+		<service android:name="org.koitharu.kotatsu.local.ui.LocalChaptersRemoveService" />
 		<service
 			android:name="org.koitharu.kotatsu.widget.shelf.ShelfWidgetService"
 			android:permission="android.permission.BIND_REMOTEVIEWS" />

app/src/main/java/org/koitharu/kotatsu/base/ui/CoroutineIntentService.kt

@@ -0,0 +1,37 @@
+package org.koitharu.kotatsu.base.ui
+
+import android.app.Service
+import android.content.Intent
+import androidx.lifecycle.lifecycleScope
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
+import kotlinx.coroutines.withContext
+
+abstract class CoroutineIntentService : BaseService() {
+
+	private val mutex = Mutex()
+	protected open val dispatcher: CoroutineDispatcher = Dispatchers.Default
+
+	override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+		super.onStartCommand(intent, flags, startId)
+		launchCoroutine(intent, startId)
+		return Service.START_REDELIVER_INTENT
+	}
+
+	private fun launchCoroutine(intent: Intent?, startId: Int) = lifecycleScope.launch {
+		mutex.withLock {
+			try {
+				withContext(dispatcher) {
+					processIntent(intent)
+				}
+			} finally {
+				stopSelf(startId)
+			}
+		}
+	}
+
+	protected abstract suspend fun processIntent(intent: Intent?)
+}

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

@@ -11,6 +11,7 @@ import androidx.appcompat.widget.SearchView
 import androidx.core.graphics.Insets
 import androidx.core.view.isVisible
 import androidx.core.view.updatePadding
+import com.google.android.material.snackbar.Snackbar
 import org.koin.androidx.viewmodel.ext.android.sharedViewModel
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.base.ui.BaseFragment
@@ -21,6 +22,7 @@ import org.koitharu.kotatsu.details.ui.adapter.ChaptersAdapter
 import org.koitharu.kotatsu.details.ui.adapter.ChaptersSelectionDecoration
 import org.koitharu.kotatsu.details.ui.model.ChapterListItem
 import org.koitharu.kotatsu.download.ui.service.DownloadService
+import org.koitharu.kotatsu.local.ui.LocalChaptersRemoveService
 import org.koitharu.kotatsu.parsers.model.MangaSource
 import org.koitharu.kotatsu.reader.ui.ReaderActivity
 import org.koitharu.kotatsu.reader.ui.ReaderState
@@ -160,8 +162,18 @@ class ChaptersFragment :
 			}
 			R.id.action_delete -> {
 				val ids = selectionDecoration?.checkedItemsIds
-				if (!ids.isNullOrEmpty()) {
-					viewModel.deleteChapters(ids.toSet())
+				val manga = viewModel.manga.value
+				when {
+					ids.isNullOrEmpty() || manga == null -> Unit
+					ids.size == manga.chapters?.size -> viewModel.deleteLocal()
+					else -> {
+						LocalChaptersRemoveService.start(requireContext(), manga, ids)
+						Snackbar.make(
+							binding.recyclerViewChapters,
+							R.string.chapters_will_removed_background,
+							Snackbar.LENGTH_LONG
+						).show()
+					}
 				}
 				mode.finish()
 				true

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

@@ -82,7 +82,6 @@ class DetailsActivity :
 		viewModel.manga.observe(this, ::onMangaUpdated)
 		viewModel.newChaptersCount.observe(this, ::onNewChaptersChanged)
 		viewModel.onMangaRemoved.observe(this, ::onMangaRemoved)
-		viewModel.onChaptersRemoved.observe(this, ::onChaptersRemoved)
 		viewModel.onError.observe(this, ::onError)
 
 		registerReceiver(downloadReceiver, IntentFilter(DownloadService.ACTION_DOWNLOAD_COMPLETE))
@@ -106,10 +105,6 @@ class DetailsActivity :
 		finishAfterTransition()
 	}
 
-	private fun onChaptersRemoved(count: Int) {
-		binding.snackbar.show(getString(R.string.removal_completed))
-	}
-
 	private fun onError(e: Throwable) {
 		when {
 			ExceptionResolver.canResolve(e) -> {
@@ -179,16 +174,15 @@ class DetailsActivity :
 			true
 		}
 		R.id.action_delete -> {
-			viewModel.manga.value?.let { m ->
-				MaterialAlertDialogBuilder(this)
-					.setTitle(R.string.delete_manga)
-					.setMessage(getString(R.string.text_delete_local_manga, m.title))
-					.setPositiveButton(R.string.delete) { _, _ ->
-						viewModel.deleteLocal(m)
-					}
-					.setNegativeButton(android.R.string.cancel, null)
-					.show()
-			}
+			val title = viewModel.manga.value?.title.orEmpty()
+			MaterialAlertDialogBuilder(this)
+				.setTitle(R.string.delete_manga)
+				.setMessage(getString(R.string.text_delete_local_manga, title))
+				.setPositiveButton(R.string.delete) { _, _ ->
+					viewModel.deleteLocal()
+				}
+				.setNegativeButton(android.R.string.cancel, null)
+				.show()
 			true
 		}
 		R.id.action_save -> {

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

@@ -86,7 +86,6 @@ class DetailsViewModel(
 		.asLiveData(viewModelScope.coroutineContext)
 
 	val onMangaRemoved = SingleLiveEvent<Manga>()
-	val onChaptersRemoved = SingleLiveEvent<Int>()
 
 	val branches = mangaData.map {
 		it?.chapters?.mapToSet { x -> x.branch }?.sortedBy { x -> x }.orEmpty()
@@ -136,8 +135,11 @@ class DetailsViewModel(
 		loadingJob = doLoad()
 	}
 
-	fun deleteLocal(manga: Manga) {
+	fun deleteLocal() {
+		val m = mangaData.value ?: return
 		launchLoadingJob(Dispatchers.Default) {
+			val manga = if (m.source == MangaSource.LOCAL) m else localMangaRepository.findSavedManga(m)
+			checkNotNull(manga) { "Cannot find saved manga for ${m.title}" }
 			val original = localMangaRepository.getRemoteManga(manga)
 			localMangaRepository.delete(manga) || throw IOException("Unable to delete file")
 			runCatching {
@@ -185,19 +187,6 @@ class DetailsViewModel(
 		}
 	}
 
-	fun deleteChapters(ids: Set<Long>) {
-		val m = mangaData.value ?: return
-		if (m.chapters?.size == ids.size) {
-			deleteLocal(m)
-			return
-		}
-		launchLoadingJob {
-			localMangaRepository.deleteChapters(m, ids)
-			reload()
-			onChaptersRemoved.call(ids.size)
-		}
-	}
-
 	private fun doLoad() = launchLoadingJob(Dispatchers.Default) {
 		var manga = mangaDataRepository.resolveIntent(intent)
 			?: throw MangaNotFoundException("Cannot find manga")

app/src/main/java/org/koitharu/kotatsu/local/ui/LocalChaptersRemoveService.kt

@@ -0,0 +1,80 @@
+package org.koitharu.kotatsu.local.ui
+
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.content.Context
+import android.content.Intent
+import android.os.Build
+import androidx.core.app.NotificationCompat
+import androidx.core.app.ServiceCompat
+import androidx.core.content.ContextCompat
+import org.koin.android.ext.android.inject
+import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.base.ui.CoroutineIntentService
+import org.koitharu.kotatsu.core.model.parcelable.ParcelableManga
+import org.koitharu.kotatsu.download.ui.service.DownloadService
+import org.koitharu.kotatsu.local.domain.LocalMangaRepository
+import org.koitharu.kotatsu.parsers.model.Manga
+
+class LocalChaptersRemoveService : CoroutineIntentService() {
+
+	private val localMangaRepository by inject<LocalMangaRepository>()
+
+	override suspend fun processIntent(intent: Intent?) {
+		val manga = intent?.getParcelableExtra<ParcelableManga>(EXTRA_MANGA)?.manga ?: return
+		val chaptersIds = intent.getLongArrayExtra(EXTRA_CHAPTERS_IDS)?.toSet() ?: return
+		startForeground()
+		val mangaWithChapters = localMangaRepository.getDetails(manga)
+		localMangaRepository.deleteChapters(mangaWithChapters, chaptersIds)
+		sendBroadcast(
+			Intent(DownloadService.ACTION_DOWNLOAD_COMPLETE)
+				.putExtra(EXTRA_MANGA, ParcelableManga(manga, withChapters = false))
+		)
+		ServiceCompat.stopForeground(this, ServiceCompat.STOP_FOREGROUND_REMOVE)
+	}
+
+	private fun startForeground() {
+		val title = getString(R.string.local_manga_processing)
+		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+			val manager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
+			val channel = NotificationChannel(CHANNEL_ID, title, NotificationManager.IMPORTANCE_LOW)
+			channel.setShowBadge(false)
+			channel.enableVibration(false)
+			channel.setSound(null, null)
+			channel.enableLights(false)
+			manager.createNotificationChannel(channel)
+		}
+
+		val notification = NotificationCompat.Builder(this, CHANNEL_ID)
+			.setContentTitle(title)
+			.setPriority(NotificationCompat.PRIORITY_MIN)
+			.setDefaults(0)
+			.setColor(ContextCompat.getColor(this, R.color.blue_primary_dark))
+			.setSilent(true)
+			.setProgress(0, 0, true)
+			.setSmallIcon(android.R.drawable.stat_notify_sync)
+			.setForegroundServiceBehavior(NotificationCompat.FOREGROUND_SERVICE_DEFERRED)
+			.setOngoing(true)
+			.build()
+		startForeground(NOTIFICATION_ID, notification)
+	}
+
+	companion object {
+
+		private const val CHANNEL_ID = "local_processing"
+		private const val NOTIFICATION_ID = 21
+
+		private const val EXTRA_MANGA = "manga"
+		private const val EXTRA_CHAPTERS_IDS = "chapters_ids"
+
+		fun start(context: Context, manga: Manga, chaptersIds: Collection<Long>) {
+			if (chaptersIds.isEmpty()) {
+				return
+			}
+			val intent = Intent(context, LocalChaptersRemoveService::class.java)
+			intent.putExtra(EXTRA_MANGA, ParcelableManga(manga, withChapters = false))
+			intent.putExtra(EXTRA_CHAPTERS_IDS, chaptersIds.toLongArray())
+			ContextCompat.startForegroundService(context, intent)
+		}
+	}
+}

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

@@ -274,4 +274,6 @@
 	<string name="parallel_downloads">Загружать параллельно</string>
 	<string name="download_slowdown">Замедление загрузки</string>
 	<string name="download_slowdown_summary">Помогает избежать блокировки IP-адреса</string>
+	<string name="local_manga_processing">Обработка сохранённой манги</string>
+	<string name="chapters_will_removed_background">Главы будут удалены в фоновом режиме. Это может занять какое-то время</string>
 </resources>

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

@@ -277,4 +277,6 @@
 	<string name="parallel_downloads">Parallel downloads</string>
 	<string name="download_slowdown">Download slowdown</string>
 	<string name="download_slowdown_summary">Helps avoid blocking your IP address</string>
+	<string name="local_manga_processing">Saved manga processing</string>
+	<string name="chapters_will_removed_background">Chapters will be removed in the background. It can take some time</string>
 </resources>