Merge branch 'feature/downloads_worker' into devel

app/src/main/AndroidManifest.xml

@@ -129,7 +129,7 @@
 			android:name="org.koitharu.kotatsu.settings.protect.ProtectSetupActivity"
 			android:windowSoftInputMode="adjustResize" />
 		<activity
-			android:name="org.koitharu.kotatsu.download.ui.DownloadsActivity"
+			android:name="org.koitharu.kotatsu.download.ui.list.DownloadsActivity"
 			android:label="@string/downloads"
 			android:launchMode="singleTop" />
 		<activity android:name="org.koitharu.kotatsu.image.ui.ImageActivity" />

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

@@ -241,8 +241,8 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 	val isDownloadsSlowdownEnabled: Boolean
 		get() = prefs.getBoolean(KEY_DOWNLOADS_SLOWDOWN, false)
 
-	val downloadsParallelism: Int
-		get() = prefs.getInt(KEY_DOWNLOADS_PARALLELISM, 2)
+	val isDownloadsWiFiOnly: Boolean
+		get() = prefs.getBoolean(KEY_DOWNLOADS_WIFI, false)
 
 	val isSuggestionsEnabled: Boolean
 		get() = prefs.getBoolean(KEY_SUGGESTIONS, false)
@@ -384,8 +384,8 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 		const val KEY_SHIKIMORI = "shikimori"
 		const val KEY_ANILIST = "anilist"
 		const val KEY_MAL = "mal"
-		const val KEY_DOWNLOADS_PARALLELISM = "downloads_parallelism"
 		const val KEY_DOWNLOADS_SLOWDOWN = "downloads_slowdown"
+		const val KEY_DOWNLOADS_WIFI = "downloads_wifi"
 		const val KEY_ALL_FAVOURITES_VISIBLE = "all_favourites_visible"
 		const val KEY_DOH = "doh"
 		const val KEY_EXIT_CONFIRM = "exit_confirm"

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

@@ -19,7 +19,6 @@ import org.koitharu.kotatsu.databinding.FragmentChaptersBinding
 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
@@ -95,11 +94,7 @@ class ChaptersFragment :
 	override fun onActionItemClicked(controller: ListSelectionController, mode: ActionMode, item: MenuItem): Boolean {
 		return when (item.itemId) {
 			R.id.action_save -> {
-				DownloadService.start(
-					binding.recyclerViewChapters,
-					viewModel.getRemoteManga() ?: viewModel.manga.value ?: return false,
-					selectionController?.snapshot(),
-				)
+				viewModel.download(selectionController?.snapshot())
 				mode.finish()
 				true
 			}

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

@@ -35,7 +35,7 @@ import org.koitharu.kotatsu.databinding.ActivityDetailsBinding
 import org.koitharu.kotatsu.details.service.MangaPrefetchService
 import org.koitharu.kotatsu.details.ui.model.ChapterListItem
 import org.koitharu.kotatsu.details.ui.model.HistoryInfo
-import org.koitharu.kotatsu.download.ui.service.DownloadService
+import org.koitharu.kotatsu.download.ui.worker.DownloadStartedObserver
 import org.koitharu.kotatsu.main.ui.owners.NoModalBottomSheetOwner
 import org.koitharu.kotatsu.parsers.model.Manga
 import org.koitharu.kotatsu.reader.ui.ReaderActivity
@@ -120,6 +120,7 @@ class DetailsActivity :
 			binding.buttonDropdown.isVisible = it.size > 1
 		}
 		viewModel.chapters.observe(this, PrefetchObserver(this))
+		viewModel.onDownloadStarted.observe(this, DownloadStartedObserver(binding.containerDetails))
 
 		addMenuProvider(
 			DetailsMenuProvider(
@@ -236,7 +237,7 @@ class DetailsActivity :
 				)
 			}
 			setNeutralButton(R.string.download) { _, _ ->
-				DownloadService.start(binding.appbar, remoteManga, setOf(chapterId))
+				viewModel.download(setOf(chapterId))
 			}
 			setCancelable(true)
 		}.show()

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

@@ -16,7 +16,6 @@ import kotlinx.coroutines.launch
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.browser.BrowserActivity
 import org.koitharu.kotatsu.core.os.ShortcutsUpdater
-import org.koitharu.kotatsu.download.ui.service.DownloadService
 import org.koitharu.kotatsu.favourites.ui.categories.select.FavouriteCategoriesBottomSheet
 import org.koitharu.kotatsu.parsers.model.Manga
 import org.koitharu.kotatsu.parsers.model.MangaSource
@@ -86,7 +85,7 @@ class DetailsMenuProvider(
 					if (chaptersCount > 5 || branches.size > 1) {
 						showSaveConfirmation(it, chaptersCount, branches)
 					} else {
-						DownloadService.start(snackbarHost, it)
+						viewModel.download(null)
 					}
 				}
 			}
@@ -140,7 +139,7 @@ class DetailsMenuProvider(
 				val chaptersIds = manga.chapters?.mapNotNullToSet { c ->
 					if (c.branch in selectedBranches) c.id else null
 				}
-				DownloadService.start(snackbarHost, manga, chaptersIds)
+				viewModel.download(chaptersIds)
 			}
 		} else {
 			dialogBuilder.setMessage(
@@ -149,7 +148,7 @@ class DetailsMenuProvider(
 					activity.resources.getQuantityString(R.plurals.chapters, chaptersCount, chaptersCount),
 				),
 			).setPositiveButton(R.string.save) { _, _ ->
-				DownloadService.start(snackbarHost, manga)
+				viewModel.download(null)
 			}
 		}
 		dialogBuilder.show()

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

@@ -36,6 +36,7 @@ import org.koitharu.kotatsu.core.prefs.observeAsFlow
 import org.koitharu.kotatsu.details.domain.BranchComparator
 import org.koitharu.kotatsu.details.ui.model.ChapterListItem
 import org.koitharu.kotatsu.details.ui.model.HistoryInfo
+import org.koitharu.kotatsu.download.ui.worker.DownloadWorker
 import org.koitharu.kotatsu.favourites.domain.FavouritesRepository
 import org.koitharu.kotatsu.history.domain.HistoryRepository
 import org.koitharu.kotatsu.local.data.LocalManga
@@ -69,11 +70,13 @@ class DetailsViewModel @Inject constructor(
 	private val imageGetter: Html.ImageGetter,
 	private val delegate: MangaDetailsDelegate,
 	@LocalStorageChanges private val localStorageChanges: SharedFlow<LocalManga?>,
+	private val downloadScheduler: DownloadWorker.Scheduler,
 ) : BaseViewModel() {
 
 	private var loadingJob: Job
 
 	val onShowToast = SingleLiveEvent<Int>()
+	val onDownloadStarted = SingleLiveEvent<Unit>()
 
 	private val history = historyRepository.observeOne(delegate.mangaId)
 		.stateIn(viewModelScope + Dispatchers.Default, SharingStarted.Eagerly, null)
@@ -282,6 +285,16 @@ class DetailsViewModel @Inject constructor(
 		}
 	}
 
+	fun download(chaptersIds: Set<Long>?) {
+		launchJob(Dispatchers.Default) {
+			downloadScheduler.schedule(
+				getRemoteManga() ?: checkNotNull(manga.value),
+				chaptersIds,
+			)
+			onDownloadStarted.emitCall(Unit)
+		}
+	}
+
 	private fun doLoad() = launchLoadingJob(Dispatchers.Default) {
 		delegate.doLoad()
 	}

app/src/main/java/org/koitharu/kotatsu/download/domain/DownloadManager.kt

@@ -1,281 +0,0 @@
-package org.koitharu.kotatsu.download.domain
-
-import android.app.Service
-import android.content.Context
-import android.webkit.MimeTypeMap
-import androidx.lifecycle.LifecycleService
-import androidx.lifecycle.lifecycleScope
-import coil.ImageLoader
-import coil.request.ImageRequest
-import coil.size.Scale
-import dagger.hilt.android.qualifiers.ApplicationContext
-import dagger.hilt.android.scopes.ServiceScoped
-import kotlinx.coroutines.CancellationException
-import kotlinx.coroutines.CoroutineExceptionHandler
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.NonCancellable
-import kotlinx.coroutines.delay
-import kotlinx.coroutines.flow.MutableSharedFlow
-import kotlinx.coroutines.flow.MutableStateFlow
-import kotlinx.coroutines.launch
-import kotlinx.coroutines.sync.Semaphore
-import kotlinx.coroutines.sync.withPermit
-import kotlinx.coroutines.withContext
-import okhttp3.OkHttpClient
-import okhttp3.Request
-import okhttp3.internal.closeQuietly
-import okio.IOException
-import org.koitharu.kotatsu.R
-import org.koitharu.kotatsu.core.network.CommonHeaders
-import org.koitharu.kotatsu.core.parser.MangaRepository
-import org.koitharu.kotatsu.core.prefs.AppSettings
-import org.koitharu.kotatsu.download.ui.service.PausingHandle
-import org.koitharu.kotatsu.local.data.LocalManga
-import org.koitharu.kotatsu.local.data.LocalStorageChanges
-import org.koitharu.kotatsu.local.data.PagesCache
-import org.koitharu.kotatsu.local.data.input.LocalMangaInput
-import org.koitharu.kotatsu.local.data.output.LocalMangaOutput
-import org.koitharu.kotatsu.local.domain.LocalMangaRepository
-import org.koitharu.kotatsu.parsers.model.Manga
-import org.koitharu.kotatsu.parsers.model.MangaSource
-import org.koitharu.kotatsu.parsers.util.await
-import org.koitharu.kotatsu.utils.ext.copyToSuspending
-import org.koitharu.kotatsu.utils.ext.deleteAwait
-import org.koitharu.kotatsu.utils.ext.ifNullOrEmpty
-import org.koitharu.kotatsu.utils.ext.printStackTraceDebug
-import org.koitharu.kotatsu.utils.ext.runCatchingCancellable
-import org.koitharu.kotatsu.utils.progress.PausingProgressJob
-import java.io.File
-import javax.inject.Inject
-
-private const val MAX_FAILSAFE_ATTEMPTS = 2
-private const val DOWNLOAD_ERROR_DELAY = 500L
-private const val SLOWDOWN_DELAY = 150L
-
-@ServiceScoped
-class DownloadManager @Inject constructor(
-	service: Service,
-	@ApplicationContext private val context: Context,
-	private val imageLoader: ImageLoader,
-	private val okHttp: OkHttpClient,
-	private val cache: PagesCache,
-	private val localMangaRepository: LocalMangaRepository,
-	private val settings: AppSettings,
-	private val mangaRepositoryFactory: MangaRepository.Factory,
-	@LocalStorageChanges private val localStorageChanges: MutableSharedFlow<LocalManga?>,
-) {
-
-	private val coverWidth = context.resources.getDimensionPixelSize(
-		androidx.core.R.dimen.compat_notification_large_icon_max_width,
-	)
-	private val coverHeight = context.resources.getDimensionPixelSize(
-		androidx.core.R.dimen.compat_notification_large_icon_max_height,
-	)
-	private val semaphore = Semaphore(settings.downloadsParallelism)
-	private val coroutineScope = (service as LifecycleService).lifecycleScope
-
-	fun downloadManga(
-		manga: Manga,
-		chaptersIds: LongArray?,
-		startId: Int,
-	): PausingProgressJob<DownloadState> {
-		val stateFlow = MutableStateFlow<DownloadState>(
-			DownloadState.Queued(startId = startId, manga = manga, cover = null),
-		)
-		val pausingHandle = PausingHandle()
-		val job = coroutineScope.launch(Dispatchers.Default + errorStateHandler(stateFlow)) {
-			try {
-				downloadMangaImpl(manga, chaptersIds?.takeUnless { it.isEmpty() }, stateFlow, pausingHandle, startId)
-			} catch (e: CancellationException) { // handle cancellation if not handled already
-				val state = stateFlow.value
-				if (state !is DownloadState.Cancelled) {
-					stateFlow.value = DownloadState.Cancelled(startId, state.manga, state.cover)
-				}
-				throw e
-			}
-		}
-		return PausingProgressJob(job, stateFlow, pausingHandle)
-	}
-
-	private suspend fun downloadMangaImpl(
-		manga: Manga,
-		chaptersIds: LongArray?,
-		outState: MutableStateFlow<DownloadState>,
-		pausingHandle: PausingHandle,
-		startId: Int,
-	) {
-		@Suppress("NAME_SHADOWING")
-		var manga = manga
-		val chaptersIdsSet = chaptersIds?.toMutableSet()
-		val cover = loadCover(manga)
-		outState.value = DownloadState.Queued(startId, manga, cover)
-		withMangaLock(manga) {
-			semaphore.withPermit {
-				outState.value = DownloadState.Preparing(startId, manga, null)
-				val destination = localMangaRepository.getOutputDir(manga)
-				checkNotNull(destination) { context.getString(R.string.cannot_find_available_storage) }
-				val tempFileName = "${manga.id}_$startId.tmp"
-				var output: LocalMangaOutput? = null
-				try {
-					if (manga.source == MangaSource.LOCAL) {
-						manga = localMangaRepository.getRemoteManga(manga)
-							?: error("Cannot obtain remote manga instance")
-					}
-					val repo = mangaRepositoryFactory.create(manga.source)
-					outState.value = DownloadState.Preparing(startId, manga, cover)
-					val data = if (manga.chapters.isNullOrEmpty()) repo.getDetails(manga) else manga
-					output = LocalMangaOutput.getOrCreate(destination, data)
-					val coverUrl = data.largeCoverUrl.ifNullOrEmpty { data.coverUrl }
-					if (coverUrl.isNotEmpty()) {
-						downloadFile(coverUrl, destination, tempFileName, repo.source).let { file ->
-							output.addCover(file, MimeTypeMap.getFileExtensionFromUrl(coverUrl))
-						}
-					}
-					val chapters = checkNotNull(
-						if (chaptersIdsSet == null) {
-							data.chapters
-						} else {
-							data.chapters?.filter { x -> chaptersIdsSet.remove(x.id) }
-						},
-					) { "Chapters list must not be null" }
-					check(chapters.isNotEmpty()) { "Chapters list must not be empty" }
-					check(chaptersIdsSet.isNullOrEmpty()) {
-						"${chaptersIdsSet?.size} of ${chaptersIds?.size} requested chapters not found in manga"
-					}
-					for ((chapterIndex, chapter) in chapters.withIndex()) {
-						val pages = runFailsafe(outState, pausingHandle) {
-							repo.getPages(chapter)
-						}
-						for ((pageIndex, page) in pages.withIndex()) {
-							runFailsafe(outState, pausingHandle) {
-								val url = repo.getPageUrl(page)
-								val file = cache.get(url)
-									?: downloadFile(url, destination, tempFileName, repo.source)
-								output.addPage(
-									chapter = chapter,
-									file = file,
-									pageNumber = pageIndex,
-									ext = MimeTypeMap.getFileExtensionFromUrl(url),
-								)
-							}
-							outState.value = DownloadState.Progress(
-								startId = startId,
-								manga = data,
-								cover = cover,
-								totalChapters = chapters.size,
-								currentChapter = chapterIndex,
-								totalPages = pages.size,
-								currentPage = pageIndex,
-							)
-
-							if (settings.isDownloadsSlowdownEnabled) {
-								delay(SLOWDOWN_DELAY)
-							}
-						}
-						if (output.flushChapter(chapter)) {
-							runCatchingCancellable {
-								localStorageChanges.emit(LocalMangaInput.of(output.rootFile).getManga())
-							}.onFailure(Throwable::printStackTraceDebug)
-						}
-					}
-					outState.value = DownloadState.PostProcessing(startId, data, cover)
-					output.mergeWithExisting()
-					output.finish()
-					val localManga = LocalMangaInput.of(output.rootFile).getManga()
-					localStorageChanges.emit(localManga)
-					outState.value = DownloadState.Done(startId, data, cover, localManga.manga)
-				} catch (e: CancellationException) {
-					outState.value = DownloadState.Cancelled(startId, manga, cover)
-					throw e
-				} catch (e: Throwable) {
-					e.printStackTraceDebug()
-					outState.value = DownloadState.Error(startId, manga, cover, e, false)
-				} finally {
-					withContext(NonCancellable) {
-						output?.closeQuietly()
-						output?.cleanup()
-						File(destination, tempFileName).deleteAwait()
-					}
-				}
-			}
-		}
-	}
-
-	private suspend fun <R> runFailsafe(
-		outState: MutableStateFlow<DownloadState>,
-		pausingHandle: PausingHandle,
-		block: suspend () -> R,
-	): R {
-		var countDown = MAX_FAILSAFE_ATTEMPTS
-		failsafe@ while (true) {
-			try {
-				return block()
-			} catch (e: IOException) {
-				if (countDown <= 0) {
-					val state = outState.value
-					outState.value = DownloadState.Error(state.startId, state.manga, state.cover, e, true)
-					countDown = MAX_FAILSAFE_ATTEMPTS
-					pausingHandle.pause()
-					pausingHandle.awaitResumed()
-					outState.value = state
-				} else {
-					countDown--
-					delay(DOWNLOAD_ERROR_DELAY)
-				}
-			}
-		}
-	}
-
-	private suspend fun downloadFile(
-		url: String,
-		destination: File,
-		tempFileName: String,
-		source: MangaSource,
-	): File {
-		val request = Request.Builder()
-			.url(url)
-			.tag(MangaSource::class.java, source)
-			.cacheControl(CommonHeaders.CACHE_CONTROL_NO_STORE)
-			.get()
-			.build()
-		val call = okHttp.newCall(request)
-		val file = File(destination, tempFileName)
-		val response = call.clone().await()
-		file.outputStream().use { out ->
-			checkNotNull(response.body).byteStream().copyToSuspending(out)
-		}
-		return file
-	}
-
-	private fun errorStateHandler(outState: MutableStateFlow<DownloadState>) =
-		CoroutineExceptionHandler { _, throwable ->
-			throwable.printStackTraceDebug()
-			val prevValue = outState.value
-			outState.value = DownloadState.Error(
-				startId = prevValue.startId,
-				manga = prevValue.manga,
-				cover = prevValue.cover,
-				error = throwable,
-				canRetry = false,
-			)
-		}
-
-	private suspend fun loadCover(manga: Manga) = runCatchingCancellable {
-		imageLoader.execute(
-			ImageRequest.Builder(context)
-				.data(manga.coverUrl)
-				.allowHardware(false)
-				.tag(manga.source)
-				.size(coverWidth, coverHeight)
-				.scale(Scale.FILL)
-				.build(),
-		).drawable
-	}.getOrNull()
-
-	private suspend inline fun <T> withMangaLock(manga: Manga, block: () -> T) = try {
-		localMangaRepository.lockManga(manga.id)
-		block()
-	} finally {
-		localMangaRepository.unlockManga(manga.id)
-	}
-}

app/src/main/java/org/koitharu/kotatsu/download/domain/DownloadState.kt

@@ -1,234 +1,123 @@
 package org.koitharu.kotatsu.download.domain
 
-import android.graphics.drawable.Drawable
+import androidx.work.Data
+import org.koitharu.kotatsu.history.domain.PROGRESS_NONE
+import org.koitharu.kotatsu.local.data.LocalManga
 import org.koitharu.kotatsu.parsers.model.Manga
+import java.util.Date
 
-sealed interface DownloadState {
+data class DownloadState(
+	val manga: Manga,
+	val isIndeterminate: Boolean,
+	val isPaused: Boolean = false,
+	val isStopped: Boolean = false,
+	val error: String? = null,
+	val totalChapters: Int = 0,
+	val currentChapter: Int = 0,
+	val totalPages: Int = 0,
+	val currentPage: Int = 0,
+	val eta: Long = -1L,
+	val localManga: LocalManga? = null,
+	val downloadedChapters: LongArray = LongArray(0),
+	val timestamp: Long = System.currentTimeMillis(),
+) {
 
-	val startId: Int
-	val manga: Manga
-	val cover: Drawable?
+	val max: Int = totalChapters * totalPages
 
-	override fun equals(other: Any?): Boolean
+	val progress: Int = totalPages * currentChapter + currentPage + 1
 
-	override fun hashCode(): Int
+	val percent: Float = if (max > 0) progress.toFloat() / max else PROGRESS_NONE
 
-	val isTerminal: Boolean
-		get() = this is Done || this is Cancelled || (this is Error && !canRetry)
+	val isFinalState: Boolean
+		get() = localManga != null || (error != null && !isPaused)
 
-	class Queued(
-		override val startId: Int,
-		override val manga: Manga,
-		override val cover: Drawable?,
-	) : DownloadState {
+	val isParticularProgress: Boolean
+		get() = localManga == null && error == null && !isPaused && !isStopped && max > 0 && !isIndeterminate
 
-		override fun equals(other: Any?): Boolean {
-			if (this === other) return true
-			if (javaClass != other?.javaClass) return false
+	fun toWorkData() = Data.Builder()
+		.putLong(DATA_MANGA_ID, manga.id)
+		.putInt(DATA_MAX, max)
+		.putInt(DATA_PROGRESS, progress)
+		.putLong(DATA_ETA, eta)
+		.putLong(DATA_TIMESTAMP, timestamp)
+		.putString(DATA_ERROR, error)
+		.putLongArray(DATA_CHAPTERS, downloadedChapters)
+		.putBoolean(DATA_INDETERMINATE, isIndeterminate)
+		.putBoolean(DATA_PAUSED, isPaused)
+		.build()
 
-			other as Queued
+	override fun equals(other: Any?): Boolean {
+		if (this === other) return true
+		if (javaClass != other?.javaClass) return false
 
-			if (startId != other.startId) return false
-			if (manga != other.manga) return false
-			if (cover != other.cover) return false
+		other as DownloadState
 
-			return true
-		}
-
-		override fun hashCode(): Int {
-			var result = startId
-			result = 31 * result + manga.hashCode()
-			result = 31 * result + (cover?.hashCode() ?: 0)
-			return result
-		}
+		if (manga != other.manga) return false
+		if (isIndeterminate != other.isIndeterminate) return false
+		if (isPaused != other.isPaused) return false
+		if (isStopped != other.isStopped) return false
+		if (error != other.error) return false
+		if (totalChapters != other.totalChapters) return false
+		if (currentChapter != other.currentChapter) return false
+		if (totalPages != other.totalPages) return false
+		if (currentPage != other.currentPage) return false
+		if (eta != other.eta) return false
+		if (localManga != other.localManga) return false
+		if (!downloadedChapters.contentEquals(other.downloadedChapters)) return false
+		if (timestamp != other.timestamp) return false
+		if (max != other.max) return false
+		if (progress != other.progress) return false
+		return percent == other.percent
 	}
 
-	class Preparing(
-		override val startId: Int,
-		override val manga: Manga,
-		override val cover: Drawable?,
-	) : DownloadState {
-
-		override fun equals(other: Any?): Boolean {
-			if (this === other) return true
-			if (javaClass != other?.javaClass) return false
-
-			other as Preparing
-
-			if (startId != other.startId) return false
-			if (manga != other.manga) return false
-			if (cover != other.cover) return false
-
-			return true
-		}
-
-		override fun hashCode(): Int {
-			var result = startId
-			result = 31 * result + manga.hashCode()
-			result = 31 * result + (cover?.hashCode() ?: 0)
-			return result
-		}
+	override fun hashCode(): Int {
+		var result = manga.hashCode()
+		result = 31 * result + isIndeterminate.hashCode()
+		result = 31 * result + isPaused.hashCode()
+		result = 31 * result + isStopped.hashCode()
+		result = 31 * result + (error?.hashCode() ?: 0)
+		result = 31 * result + totalChapters
+		result = 31 * result + currentChapter
+		result = 31 * result + totalPages
+		result = 31 * result + currentPage
+		result = 31 * result + eta.hashCode()
+		result = 31 * result + (localManga?.hashCode() ?: 0)
+		result = 31 * result + downloadedChapters.contentHashCode()
+		result = 31 * result + timestamp.hashCode()
+		result = 31 * result + max
+		result = 31 * result + progress
+		result = 31 * result + percent.hashCode()
+		return result
 	}
 
-	class Progress(
-		override val startId: Int,
-		override val manga: Manga,
-		override val cover: Drawable?,
-		val totalChapters: Int,
-		val currentChapter: Int,
-		val totalPages: Int,
-		val currentPage: Int,
-	) : DownloadState {
+	companion object {
 
-		val max: Int = totalChapters * totalPages
+		private const val DATA_MANGA_ID = "manga_id"
+		private const val DATA_MAX = "max"
+		private const val DATA_PROGRESS = "progress"
+		private const val DATA_CHAPTERS = "chapter"
+		private const val DATA_ETA = "eta"
+		private const val DATA_TIMESTAMP = "timestamp"
+		private const val DATA_ERROR = "error"
+		private const val DATA_INDETERMINATE = "indeterminate"
+		private const val DATA_PAUSED = "paused"
 
-		val progress: Int = totalPages * currentChapter + currentPage + 1
+		fun getMangaId(data: Data): Long = data.getLong(DATA_MANGA_ID, 0L)
 
-		val percent: Float = progress.toFloat() / max
+		fun isIndeterminate(data: Data): Boolean = data.getBoolean(DATA_INDETERMINATE, false)
 
-		override fun equals(other: Any?): Boolean {
-			if (this === other) return true
-			if (javaClass != other?.javaClass) return false
+		fun isPaused(data: Data): Boolean = data.getBoolean(DATA_PAUSED, false)
 
-			other as Progress
+		fun getMax(data: Data): Int = data.getInt(DATA_MAX, 0)
 
-			if (startId != other.startId) return false
-			if (manga != other.manga) return false
-			if (cover != other.cover) return false
-			if (totalChapters != other.totalChapters) return false
-			if (currentChapter != other.currentChapter) return false
-			if (totalPages != other.totalPages) return false
-			if (currentPage != other.currentPage) return false
+		fun getError(data: Data): String? = data.getString(DATA_ERROR)
 
-			return true
-		}
+		fun getProgress(data: Data): Int = data.getInt(DATA_PROGRESS, 0)
 
-		override fun hashCode(): Int {
-			var result = startId
-			result = 31 * result + manga.hashCode()
-			result = 31 * result + (cover?.hashCode() ?: 0)
-			result = 31 * result + totalChapters
-			result = 31 * result + currentChapter
-			result = 31 * result + totalPages
-			result = 31 * result + currentPage
-			return result
-		}
-	}
+		fun getEta(data: Data): Long = data.getLong(DATA_ETA, -1L)
 
-	class Done(
-		override val startId: Int,
-		override val manga: Manga,
-		override val cover: Drawable?,
-		val localManga: Manga,
-	) : DownloadState {
+		fun getTimestamp(data: Data): Date = Date(data.getLong(DATA_TIMESTAMP, 0L))
 
-		override fun equals(other: Any?): Boolean {
-			if (this === other) return true
-			if (javaClass != other?.javaClass) return false
-
-			other as Done
-
-			if (startId != other.startId) return false
-			if (manga != other.manga) return false
-			if (cover != other.cover) return false
-			if (localManga != other.localManga) return false
-
-			return true
-		}
-
-		override fun hashCode(): Int {
-			var result = startId
-			result = 31 * result + manga.hashCode()
-			result = 31 * result + (cover?.hashCode() ?: 0)
-			result = 31 * result + localManga.hashCode()
-			return result
-		}
-	}
-
-	class Error(
-		override val startId: Int,
-		override val manga: Manga,
-		override val cover: Drawable?,
-		val error: Throwable,
-		val canRetry: Boolean,
-	) : DownloadState {
-
-		override fun equals(other: Any?): Boolean {
-			if (this === other) return true
-			if (javaClass != other?.javaClass) return false
-
-			other as Error
-
-			if (startId != other.startId) return false
-			if (manga != other.manga) return false
-			if (cover != other.cover) return false
-			if (error != other.error) return false
-			if (canRetry != other.canRetry) return false
-
-			return true
-		}
-
-		override fun hashCode(): Int {
-			var result = startId
-			result = 31 * result + manga.hashCode()
-			result = 31 * result + (cover?.hashCode() ?: 0)
-			result = 31 * result + error.hashCode()
-			result = 31 * result + canRetry.hashCode()
-			return result
-		}
-	}
-
-	class Cancelled(
-		override val startId: Int,
-		override val manga: Manga,
-		override val cover: Drawable?,
-	) : DownloadState {
-
-		override fun equals(other: Any?): Boolean {
-			if (this === other) return true
-			if (javaClass != other?.javaClass) return false
-
-			other as Cancelled
-
-			if (startId != other.startId) return false
-			if (manga != other.manga) return false
-			if (cover != other.cover) return false
-
-			return true
-		}
-
-		override fun hashCode(): Int {
-			var result = startId
-			result = 31 * result + manga.hashCode()
-			result = 31 * result + (cover?.hashCode() ?: 0)
-			return result
-		}
-	}
-
-	class PostProcessing(
-		override val startId: Int,
-		override val manga: Manga,
-		override val cover: Drawable?,
-	) : DownloadState {
-
-		override fun equals(other: Any?): Boolean {
-			if (this === other) return true
-			if (javaClass != other?.javaClass) return false
-
-			other as PostProcessing
-
-			if (startId != other.startId) return false
-			if (manga != other.manga) return false
-			if (cover != other.cover) return false
-
-			return true
-		}
-
-		override fun hashCode(): Int {
-			var result = startId
-			result = 31 * result + manga.hashCode()
-			result = 31 * result + (cover?.hashCode() ?: 0)
-			return result
-		}
+		fun getDownloadedChapters(data: Data): LongArray = data.getLongArray(DATA_CHAPTERS) ?: LongArray(0)
 	}
 }

app/src/main/java/org/koitharu/kotatsu/download/ui/DownloadItemAD.kt

@@ -1,140 +0,0 @@
-package org.koitharu.kotatsu.download.ui
-
-import android.view.View
-import androidx.core.view.isVisible
-import androidx.lifecycle.LifecycleOwner
-import androidx.lifecycle.lifecycleScope
-import coil.ImageLoader
-import com.hannesdorfmann.adapterdelegates4.dsl.adapterDelegateViewBinding
-import kotlinx.coroutines.Job
-import kotlinx.coroutines.flow.launchIn
-import kotlinx.coroutines.flow.onEach
-import org.koitharu.kotatsu.R
-import org.koitharu.kotatsu.databinding.ItemDownloadBinding
-import org.koitharu.kotatsu.details.ui.DetailsActivity
-import org.koitharu.kotatsu.download.domain.DownloadState
-import org.koitharu.kotatsu.parsers.util.format
-import org.koitharu.kotatsu.utils.ext.enqueueWith
-import org.koitharu.kotatsu.utils.ext.getDisplayMessage
-import org.koitharu.kotatsu.utils.ext.newImageRequest
-import org.koitharu.kotatsu.utils.ext.onFirst
-import org.koitharu.kotatsu.utils.ext.source
-
-fun downloadItemAD(
-	lifecycleOwner: LifecycleOwner,
-	coil: ImageLoader,
-) = adapterDelegateViewBinding<DownloadItem, DownloadItem, ItemDownloadBinding>(
-	{ inflater, parent -> ItemDownloadBinding.inflate(inflater, parent, false) },
-) {
-	var job: Job? = null
-	val percentPattern = context.resources.getString(R.string.percent_string_pattern)
-
-	val clickListener = View.OnClickListener { v ->
-		when (v.id) {
-			R.id.button_cancel -> item.cancel()
-			R.id.button_resume -> item.resume()
-			else -> context.startActivity(
-				DetailsActivity.newIntent(context, item.progressValue.manga),
-			)
-		}
-	}
-	binding.buttonCancel.setOnClickListener(clickListener)
-	binding.buttonResume.setOnClickListener(clickListener)
-	itemView.setOnClickListener(clickListener)
-
-	bind {
-		job?.cancel()
-		job = item.progressAsFlow().onFirst { state ->
-			binding.imageViewCover.newImageRequest(lifecycleOwner, state.manga.coverUrl)?.run {
-				placeholder(state.cover)
-				fallback(R.drawable.ic_placeholder)
-				error(R.drawable.ic_error_placeholder)
-				source(state.manga.source)
-				allowRgb565(true)
-				enqueueWith(coil)
-			}
-		}.onEach { state ->
-			binding.textViewTitle.text = state.manga.title
-			when (state) {
-				is DownloadState.Cancelled -> {
-					binding.textViewStatus.setText(R.string.cancelling_)
-					binding.progressBar.isIndeterminate = true
-					binding.progressBar.isVisible = true
-					binding.textViewPercent.isVisible = false
-					binding.textViewDetails.isVisible = false
-					binding.buttonCancel.isVisible = false
-					binding.buttonResume.isVisible = false
-				}
-
-				is DownloadState.Done -> {
-					binding.textViewStatus.setText(R.string.download_complete)
-					binding.progressBar.isIndeterminate = false
-					binding.progressBar.isVisible = false
-					binding.textViewPercent.isVisible = false
-					binding.textViewDetails.isVisible = false
-					binding.buttonCancel.isVisible = false
-					binding.buttonResume.isVisible = false
-				}
-
-				is DownloadState.Error -> {
-					binding.textViewStatus.setText(R.string.error_occurred)
-					binding.progressBar.isIndeterminate = false
-					binding.progressBar.isVisible = false
-					binding.textViewPercent.isVisible = false
-					binding.textViewDetails.text = state.error.getDisplayMessage(context.resources)
-					binding.textViewDetails.isVisible = true
-					binding.buttonCancel.isVisible = state.canRetry
-					binding.buttonResume.isVisible = state.canRetry
-				}
-
-				is DownloadState.PostProcessing -> {
-					binding.textViewStatus.setText(R.string.processing_)
-					binding.progressBar.isIndeterminate = true
-					binding.progressBar.isVisible = true
-					binding.textViewPercent.isVisible = false
-					binding.textViewDetails.isVisible = false
-					binding.buttonCancel.isVisible = false
-					binding.buttonResume.isVisible = false
-				}
-
-				is DownloadState.Preparing -> {
-					binding.textViewStatus.setText(R.string.preparing_)
-					binding.progressBar.isIndeterminate = true
-					binding.progressBar.isVisible = true
-					binding.textViewPercent.isVisible = false
-					binding.textViewDetails.isVisible = false
-					binding.buttonCancel.isVisible = true
-					binding.buttonResume.isVisible = false
-				}
-
-				is DownloadState.Progress -> {
-					binding.textViewStatus.setText(R.string.manga_downloading_)
-					binding.progressBar.isIndeterminate = false
-					binding.progressBar.isVisible = true
-					binding.progressBar.max = state.max
-					binding.progressBar.setProgressCompat(state.progress, true)
-					binding.textViewPercent.text = percentPattern.format((state.percent * 100f).format(1))
-					binding.textViewPercent.isVisible = true
-					binding.textViewDetails.isVisible = false
-					binding.buttonCancel.isVisible = true
-					binding.buttonResume.isVisible = false
-				}
-
-				is DownloadState.Queued -> {
-					binding.textViewStatus.setText(R.string.queued)
-					binding.progressBar.isIndeterminate = false
-					binding.progressBar.isVisible = false
-					binding.textViewPercent.isVisible = false
-					binding.textViewDetails.isVisible = false
-					binding.buttonCancel.isVisible = true
-					binding.buttonResume.isVisible = false
-				}
-			}
-		}.launchIn(lifecycleOwner.lifecycleScope)
-	}
-
-	onViewRecycled {
-		job?.cancel()
-		job = null
-	}
-}

app/src/main/java/org/koitharu/kotatsu/download/ui/DownloadsActivity.kt

@@ -1,58 +0,0 @@
-package org.koitharu.kotatsu.download.ui
-
-import android.content.Context
-import android.content.Intent
-import android.os.Bundle
-import androidx.core.graphics.Insets
-import androidx.core.view.isVisible
-import androidx.core.view.updatePadding
-import coil.ImageLoader
-import dagger.hilt.android.AndroidEntryPoint
-import org.koitharu.kotatsu.R
-import org.koitharu.kotatsu.base.ui.BaseActivity
-import org.koitharu.kotatsu.base.ui.list.decor.SpacingItemDecoration
-import org.koitharu.kotatsu.databinding.ActivityDownloadsBinding
-import javax.inject.Inject
-
-@AndroidEntryPoint
-class DownloadsActivity : BaseActivity<ActivityDownloadsBinding>() {
-
-	@Inject
-	lateinit var coil: ImageLoader
-
-	private lateinit var serviceConnection: DownloadsConnection
-
-	override fun onCreate(savedInstanceState: Bundle?) {
-		super.onCreate(savedInstanceState)
-		setContentView(ActivityDownloadsBinding.inflate(layoutInflater))
-		supportActionBar?.setDisplayHomeAsUpEnabled(true)
-		val adapter = DownloadsAdapter(this, coil)
-		val spacing = resources.getDimensionPixelOffset(R.dimen.list_spacing)
-		binding.recyclerView.addItemDecoration(SpacingItemDecoration(spacing))
-		binding.recyclerView.setHasFixedSize(true)
-		binding.recyclerView.adapter = adapter
-		serviceConnection = DownloadsConnection(this, this)
-		serviceConnection.items.observe(this) { items ->
-			adapter.items = items
-			binding.textViewHolder.isVisible = items.isNullOrEmpty()
-		}
-		serviceConnection.bind()
-	}
-
-	override fun onWindowInsetsChanged(insets: Insets) {
-		binding.recyclerView.updatePadding(
-			left = insets.left,
-			right = insets.right,
-			bottom = insets.bottom,
-		)
-		binding.toolbar.updatePadding(
-			left = insets.left,
-			right = insets.right,
-		)
-	}
-
-	companion object {
-
-		fun newIntent(context: Context) = Intent(context, DownloadsActivity::class.java)
-	}
-}

app/src/main/java/org/koitharu/kotatsu/download/ui/DownloadsAdapter.kt

@@ -1,46 +0,0 @@
-package org.koitharu.kotatsu.download.ui
-
-import androidx.lifecycle.LifecycleOwner
-import androidx.recyclerview.widget.DiffUtil
-import coil.ImageLoader
-import com.hannesdorfmann.adapterdelegates4.AsyncListDifferDelegationAdapter
-import org.koitharu.kotatsu.download.domain.DownloadState
-import org.koitharu.kotatsu.utils.progress.PausingProgressJob
-
-typealias DownloadItem = PausingProgressJob<DownloadState>
-
-class DownloadsAdapter(
-	lifecycleOwner: LifecycleOwner,
-	coil: ImageLoader,
-) : AsyncListDifferDelegationAdapter<DownloadItem>(DiffCallback()) {
-
-	init {
-		delegatesManager.addDelegate(downloadItemAD(lifecycleOwner, coil))
-		setHasStableIds(true)
-	}
-
-	override fun getItemId(position: Int): Long {
-		return items[position].progressValue.startId.toLong()
-	}
-
-	private class DiffCallback : DiffUtil.ItemCallback<DownloadItem>() {
-
-		override fun areItemsTheSame(
-			oldItem: DownloadItem,
-			newItem: DownloadItem,
-		): Boolean {
-			return oldItem.progressValue.startId == newItem.progressValue.startId
-		}
-
-		override fun areContentsTheSame(
-			oldItem: DownloadItem,
-			newItem: DownloadItem,
-		): Boolean {
-			return oldItem.progressValue == newItem.progressValue && oldItem.isPaused == newItem.isPaused
-		}
-
-		override fun getChangePayload(oldItem: DownloadItem, newItem: DownloadItem): Any {
-			return Unit
-		}
-	}
-}

app/src/main/java/org/koitharu/kotatsu/download/ui/DownloadsConnection.kt

@@ -1,76 +0,0 @@
-package org.koitharu.kotatsu.download.ui
-
-import android.content.ComponentName
-import android.content.Context
-import android.content.Intent
-import android.content.ServiceConnection
-import android.os.IBinder
-import androidx.lifecycle.DefaultLifecycleObserver
-import androidx.lifecycle.LifecycleOwner
-import androidx.lifecycle.lifecycleScope
-import kotlinx.coroutines.Job
-import kotlinx.coroutines.flow.MutableStateFlow
-import kotlinx.coroutines.launch
-import org.koitharu.kotatsu.download.domain.DownloadState
-import org.koitharu.kotatsu.download.ui.service.DownloadService
-import org.koitharu.kotatsu.utils.asFlowLiveData
-import org.koitharu.kotatsu.utils.progress.PausingProgressJob
-
-class DownloadsConnection(
-	private val context: Context,
-	private val lifecycleOwner: LifecycleOwner,
-) : ServiceConnection {
-
-	private var bindingObserver: BindingLifecycleObserver? = null
-	private var collectJob: Job? = null
-	private val itemsFlow = MutableStateFlow<List<PausingProgressJob<DownloadState>>>(emptyList())
-
-	val items
-		get() = itemsFlow.asFlowLiveData()
-
-	override fun onServiceConnected(name: ComponentName?, service: IBinder?) {
-		collectJob?.cancel()
-		val binder = (service as? DownloadService.DownloadBinder)
-		collectJob = if (binder == null) {
-			null
-		} else {
-			lifecycleOwner.lifecycleScope.launch {
-				binder.downloads.collect {
-					itemsFlow.value = it
-				}
-			}
-		}
-	}
-
-	override fun onServiceDisconnected(name: ComponentName?) {
-		collectJob?.cancel()
-		collectJob = null
-		itemsFlow.value = itemsFlow.value.filter { it.progressValue.isTerminal }
-	}
-
-	fun bind() {
-		if (bindingObserver != null) {
-			return
-		}
-		bindingObserver = BindingLifecycleObserver().also {
-			lifecycleOwner.lifecycle.addObserver(it)
-		}
-		context.bindService(Intent(context, DownloadService::class.java), this, 0)
-	}
-
-	fun unbind() {
-		bindingObserver?.let {
-			lifecycleOwner.lifecycle.removeObserver(it)
-		}
-		bindingObserver = null
-		context.unbindService(this)
-	}
-
-	private inner class BindingLifecycleObserver : DefaultLifecycleObserver {
-
-		override fun onDestroy(owner: LifecycleOwner) {
-			super.onDestroy(owner)
-			unbind()
-		}
-	}
-}

app/src/main/java/org/koitharu/kotatsu/download/ui/list/DownloadItemAD.kt

@@ -0,0 +1,140 @@
+package org.koitharu.kotatsu.download.ui.list
+
+import android.view.View
+import androidx.core.view.isVisible
+import androidx.lifecycle.LifecycleOwner
+import androidx.work.WorkInfo
+import coil.ImageLoader
+import com.hannesdorfmann.adapterdelegates4.dsl.adapterDelegateViewBinding
+import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.databinding.ItemDownloadBinding
+import org.koitharu.kotatsu.list.ui.model.ListModel
+import org.koitharu.kotatsu.parsers.util.format
+import org.koitharu.kotatsu.utils.ext.disposeImageRequest
+import org.koitharu.kotatsu.utils.ext.enqueueWith
+import org.koitharu.kotatsu.utils.ext.newImageRequest
+import org.koitharu.kotatsu.utils.ext.source
+import org.koitharu.kotatsu.utils.ext.textAndVisible
+
+fun downloadItemAD(
+	lifecycleOwner: LifecycleOwner,
+	coil: ImageLoader,
+	listener: DownloadItemListener,
+) = adapterDelegateViewBinding<DownloadItemModel, ListModel, ItemDownloadBinding>(
+	{ inflater, parent -> ItemDownloadBinding.inflate(inflater, parent, false) },
+) {
+
+	val percentPattern = context.resources.getString(R.string.percent_string_pattern)
+
+	val clickListener = object : View.OnClickListener, View.OnLongClickListener {
+		override fun onClick(v: View) {
+			when (v.id) {
+				R.id.button_cancel -> listener.onCancelClick(item)
+				R.id.button_resume -> listener.onResumeClick(item)
+				R.id.button_pause -> listener.onPauseClick(item)
+				else -> listener.onItemClick(item, v)
+			}
+		}
+
+		override fun onLongClick(v: View): Boolean {
+			return listener.onItemLongClick(item, v)
+		}
+	}
+	binding.buttonCancel.setOnClickListener(clickListener)
+	binding.buttonPause.setOnClickListener(clickListener)
+	binding.buttonResume.setOnClickListener(clickListener)
+	itemView.setOnClickListener(clickListener)
+	itemView.setOnLongClickListener(clickListener)
+
+	bind { payloads ->
+		binding.textViewTitle.text = item.manga.title
+		binding.imageViewCover.newImageRequest(lifecycleOwner, item.manga.coverUrl)?.apply {
+			placeholder(R.drawable.ic_placeholder)
+			fallback(R.drawable.ic_placeholder)
+			error(R.drawable.ic_error_placeholder)
+			allowRgb565(true)
+			source(item.manga.source)
+			enqueueWith(coil)
+		}
+		when (item.workState) {
+			WorkInfo.State.ENQUEUED,
+			WorkInfo.State.BLOCKED -> {
+				binding.textViewStatus.setText(R.string.queued)
+				binding.progressBar.isIndeterminate = false
+				binding.progressBar.isVisible = false
+				binding.progressBar.isEnabled = true
+				binding.textViewPercent.isVisible = false
+				binding.textViewDetails.isVisible = false
+				binding.buttonCancel.isVisible = true
+				binding.buttonResume.isVisible = false
+				binding.buttonPause.isVisible = false
+			}
+
+			WorkInfo.State.RUNNING -> {
+				binding.textViewStatus.setText(
+					if (item.isPaused) R.string.paused else R.string.manga_downloading_,
+				)
+				binding.progressBar.isIndeterminate = item.isIndeterminate
+				binding.progressBar.isVisible = true
+				binding.progressBar.max = item.max
+				binding.progressBar.isEnabled = !item.isPaused
+				binding.progressBar.setProgressCompat(item.progress, payloads.isNotEmpty())
+				binding.textViewPercent.text = percentPattern.format((item.percent * 100f).format(1))
+				binding.textViewPercent.isVisible = true
+				binding.textViewDetails.textAndVisible = item.getEtaString()
+				binding.buttonCancel.isVisible = true
+				binding.buttonResume.isVisible = item.isPaused
+				binding.buttonPause.isVisible = item.canPause
+			}
+
+			WorkInfo.State.SUCCEEDED -> {
+				binding.textViewStatus.setText(R.string.download_complete)
+				binding.progressBar.isIndeterminate = false
+				binding.progressBar.isVisible = false
+				binding.progressBar.isEnabled = true
+				binding.textViewPercent.isVisible = false
+				if (item.totalChapters > 0) {
+					binding.textViewDetails.text = context.resources.getQuantityString(
+						R.plurals.chapters,
+						item.totalChapters,
+						item.totalChapters,
+					)
+					binding.textViewDetails.isVisible = true
+				} else {
+					binding.textViewDetails.isVisible = false
+				}
+				binding.buttonCancel.isVisible = false
+				binding.buttonResume.isVisible = false
+				binding.buttonPause.isVisible = false
+			}
+
+			WorkInfo.State.FAILED -> {
+				binding.textViewStatus.setText(R.string.error_occurred)
+				binding.progressBar.isIndeterminate = false
+				binding.progressBar.isVisible = false
+				binding.progressBar.isEnabled = true
+				binding.textViewPercent.isVisible = false
+				binding.textViewDetails.textAndVisible = item.error
+				binding.buttonCancel.isVisible = false
+				binding.buttonResume.isVisible = false
+				binding.buttonPause.isVisible = false
+			}
+
+			WorkInfo.State.CANCELLED -> {
+				binding.textViewStatus.setText(R.string.canceled)
+				binding.progressBar.isIndeterminate = false
+				binding.progressBar.isVisible = false
+				binding.progressBar.isEnabled = true
+				binding.textViewPercent.isVisible = false
+				binding.textViewDetails.isVisible = false
+				binding.buttonCancel.isVisible = false
+				binding.buttonResume.isVisible = false
+				binding.buttonPause.isVisible = false
+			}
+		}
+	}
+
+	onViewRecycled {
+		binding.imageViewCover.disposeImageRequest()
+	}
+}

app/src/main/java/org/koitharu/kotatsu/download/ui/list/DownloadItemListener.kt

@@ -0,0 +1,12 @@
+package org.koitharu.kotatsu.download.ui.list
+
+import org.koitharu.kotatsu.base.ui.list.OnListItemClickListener
+
+interface DownloadItemListener : OnListItemClickListener<DownloadItemModel> {
+
+	fun onCancelClick(item: DownloadItemModel)
+
+	fun onPauseClick(item: DownloadItemModel)
+
+	fun onResumeClick(item: DownloadItemModel)
+}

app/src/main/java/org/koitharu/kotatsu/download/ui/list/DownloadItemModel.kt

@@ -0,0 +1,83 @@
+package org.koitharu.kotatsu.download.ui.list
+
+import android.text.format.DateUtils
+import androidx.work.WorkInfo
+import org.koitharu.kotatsu.list.ui.model.ListModel
+import org.koitharu.kotatsu.parsers.model.Manga
+import java.util.Date
+import java.util.UUID
+
+class DownloadItemModel(
+	val id: UUID,
+	val workState: WorkInfo.State,
+	val isIndeterminate: Boolean,
+	val isPaused: Boolean,
+	val manga: Manga,
+	val error: String?,
+	val max: Int,
+	val totalChapters: Int,
+	val progress: Int,
+	val eta: Long,
+	val timestamp: Date,
+) : ListModel, Comparable<DownloadItemModel> {
+
+	val percent: Float
+		get() = if (max > 0) progress / max.toFloat() else 0f
+
+	val hasEta: Boolean
+		get() = workState == WorkInfo.State.RUNNING && !isPaused && eta > 0L
+
+	val canPause: Boolean
+		get() = workState == WorkInfo.State.RUNNING && !isPaused && error == null
+
+	val canResume: Boolean
+		get() = workState == WorkInfo.State.RUNNING && isPaused
+
+	fun getEtaString(): CharSequence? = if (hasEta) {
+		DateUtils.getRelativeTimeSpanString(
+			eta,
+			System.currentTimeMillis(),
+			DateUtils.SECOND_IN_MILLIS,
+		)
+	} else {
+		null
+	}
+
+	override fun compareTo(other: DownloadItemModel): Int {
+		return timestamp.compareTo(other.timestamp)
+	}
+
+	override fun equals(other: Any?): Boolean {
+		if (this === other) return true
+		if (javaClass != other?.javaClass) return false
+
+		other as DownloadItemModel
+
+		if (id != other.id) return false
+		if (workState != other.workState) return false
+		if (isIndeterminate != other.isIndeterminate) return false
+		if (isPaused != other.isPaused) return false
+		if (manga != other.manga) return false
+		if (error != other.error) return false
+		if (max != other.max) return false
+		if (totalChapters != other.totalChapters) return false
+		if (progress != other.progress) return false
+		if (eta != other.eta) return false
+		return timestamp == other.timestamp
+	}
+
+	override fun hashCode(): Int {
+		var result = id.hashCode()
+		result = 31 * result + workState.hashCode()
+		result = 31 * result + isIndeterminate.hashCode()
+		result = 31 * result + isPaused.hashCode()
+		result = 31 * result + manga.hashCode()
+		result = 31 * result + (error?.hashCode() ?: 0)
+		result = 31 * result + max
+		result = 31 * result + totalChapters
+		result = 31 * result + progress
+		result = 31 * result + eta.hashCode()
+		result = 31 * result + timestamp.hashCode()
+		return result
+	}
+}

app/src/main/java/org/koitharu/kotatsu/download/ui/list/DownloadsActivity.kt

@@ -0,0 +1,171 @@
+package org.koitharu.kotatsu.download.ui.list
+
+import android.content.Context
+import android.content.Intent
+import android.os.Bundle
+import android.view.Menu
+import android.view.MenuItem
+import android.view.View
+import androidx.activity.viewModels
+import androidx.annotation.Px
+import androidx.appcompat.view.ActionMode
+import androidx.core.graphics.Insets
+import androidx.core.view.updatePadding
+import androidx.lifecycle.Observer
+import coil.ImageLoader
+import dagger.hilt.android.AndroidEntryPoint
+import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.base.ui.BaseActivity
+import org.koitharu.kotatsu.base.ui.list.ListSelectionController
+import org.koitharu.kotatsu.base.ui.list.decor.SpacingItemDecoration
+import org.koitharu.kotatsu.databinding.ActivityDownloadsBinding
+import org.koitharu.kotatsu.details.ui.DetailsActivity
+import org.koitharu.kotatsu.download.ui.worker.PausingReceiver
+import javax.inject.Inject
+
+@AndroidEntryPoint
+class DownloadsActivity : BaseActivity<ActivityDownloadsBinding>(),
+	DownloadItemListener,
+	ListSelectionController.Callback2 {
+
+	@Inject
+	lateinit var coil: ImageLoader
+
+	private val viewModel by viewModels<DownloadsViewModel>()
+	private lateinit var selectionController: ListSelectionController
+
+	@Px
+	private var listSpacing = 0
+
+	override fun onCreate(savedInstanceState: Bundle?) {
+		super.onCreate(savedInstanceState)
+		setContentView(ActivityDownloadsBinding.inflate(layoutInflater))
+		listSpacing = resources.getDimensionPixelOffset(R.dimen.list_spacing)
+		supportActionBar?.setDisplayHomeAsUpEnabled(true)
+		val downloadsAdapter = DownloadsAdapter(this, coil, this)
+		val decoration = SpacingItemDecoration(listSpacing)
+		selectionController = ListSelectionController(
+			activity = this,
+			decoration = DownloadsSelectionDecoration(this),
+			registryOwner = this,
+			callback = this,
+		)
+		with(binding.recyclerView) {
+			setHasFixedSize(true)
+			addItemDecoration(decoration)
+			adapter = downloadsAdapter
+			selectionController.attachToRecyclerView(this)
+		}
+		addMenuProvider(DownloadsMenuProvider(this, viewModel))
+		viewModel.items.observe(this) {
+			downloadsAdapter.items = it
+		}
+		val menuObserver = Observer<Any> { _ -> invalidateOptionsMenu() }
+		viewModel.hasActiveWorks.observe(this, menuObserver)
+		viewModel.hasPausedWorks.observe(this, menuObserver)
+		viewModel.hasCancellableWorks.observe(this, menuObserver)
+	}
+
+	override fun onWindowInsetsChanged(insets: Insets) {
+		binding.recyclerView.updatePadding(
+			left = insets.left + listSpacing,
+			right = insets.right + listSpacing,
+			bottom = insets.bottom,
+		)
+		binding.toolbar.updatePadding(
+			left = insets.left,
+			right = insets.right,
+		)
+	}
+
+	override fun onItemClick(item: DownloadItemModel, view: View) {
+		if (selectionController.onItemClick(item.id.mostSignificantBits)) {
+			return
+		}
+		startActivity(DetailsActivity.newIntent(view.context, item.manga))
+	}
+
+	override fun onItemLongClick(item: DownloadItemModel, view: View): Boolean {
+		return selectionController.onItemLongClick(item.id.mostSignificantBits)
+	}
+
+	override fun onCancelClick(item: DownloadItemModel) {
+		viewModel.cancel(item.id)
+	}
+
+	override fun onPauseClick(item: DownloadItemModel) {
+		sendBroadcast(PausingReceiver.getPauseIntent(item.id))
+	}
+
+	override fun onResumeClick(item: DownloadItemModel) {
+		sendBroadcast(PausingReceiver.getResumeIntent(item.id))
+	}
+
+	override fun onSelectionChanged(controller: ListSelectionController, count: Int) {
+		binding.recyclerView.invalidateItemDecorations()
+	}
+
+	override fun onCreateActionMode(controller: ListSelectionController, mode: ActionMode, menu: Menu): Boolean {
+		mode.menuInflater.inflate(R.menu.mode_downloads, menu)
+		return true
+	}
+
+	override fun onActionItemClicked(controller: ListSelectionController, mode: ActionMode, item: MenuItem): Boolean {
+		return when (item.itemId) {
+			R.id.action_resume -> {
+				viewModel.resume(controller.snapshot())
+				mode.finish()
+				true
+			}
+
+			R.id.action_pause -> {
+				viewModel.pause(controller.snapshot())
+				mode.finish()
+				true
+			}
+
+			R.id.action_cancel -> {
+				viewModel.cancel(controller.snapshot())
+				mode.finish()
+				true
+			}
+
+			R.id.action_remove -> {
+				viewModel.remove(controller.snapshot())
+				mode.finish()
+				true
+			}
+
+			R.id.action_select_all -> {
+				controller.addAll(viewModel.allIds())
+				true
+			}
+
+			else -> false
+		}
+	}
+
+	override fun onPrepareActionMode(controller: ListSelectionController, mode: ActionMode, menu: Menu): Boolean {
+		val snapshot = viewModel.snapshot(controller.peekCheckedIds())
+		var canPause = true
+		var canResume = true
+		var canCancel = true
+		var canRemove = true
+		for (item in snapshot) {
+			canPause = canPause and item.canPause
+			canResume = canResume and item.canResume
+			canCancel = canCancel and !item.workState.isFinished
+			canRemove = canRemove and item.workState.isFinished
+		}
+		menu.findItem(R.id.action_pause)?.isVisible = canPause
+		menu.findItem(R.id.action_resume)?.isVisible = canResume
+		menu.findItem(R.id.action_cancel)?.isVisible = canCancel
+		menu.findItem(R.id.action_remove)?.isVisible = canRemove
+		return super.onPrepareActionMode(controller, mode, menu)
+	}
+
+	companion object {
+
+		fun newIntent(context: Context) = Intent(context, DownloadsActivity::class.java)
+	}
+}

app/src/main/java/org/koitharu/kotatsu/download/ui/list/DownloadsAdapter.kt

@@ -0,0 +1,65 @@
+package org.koitharu.kotatsu.download.ui.list
+
+import androidx.lifecycle.LifecycleOwner
+import androidx.recyclerview.widget.DiffUtil
+import coil.ImageLoader
+import com.hannesdorfmann.adapterdelegates4.AsyncListDifferDelegationAdapter
+import org.koitharu.kotatsu.core.ui.DateTimeAgo
+import org.koitharu.kotatsu.list.ui.adapter.emptyStateListAD
+import org.koitharu.kotatsu.list.ui.adapter.loadingStateAD
+import org.koitharu.kotatsu.list.ui.adapter.relatedDateItemAD
+import org.koitharu.kotatsu.list.ui.model.ListModel
+import kotlin.jvm.internal.Intrinsics
+
+class DownloadsAdapter(
+	lifecycleOwner: LifecycleOwner,
+	coil: ImageLoader,
+	listener: DownloadItemListener,
+) : AsyncListDifferDelegationAdapter<ListModel>(DiffCallback()) {
+
+	init {
+		delegatesManager.addDelegate(ITEM_TYPE_DOWNLOAD, downloadItemAD(lifecycleOwner, coil, listener))
+			.addDelegate(loadingStateAD())
+			.addDelegate(emptyStateListAD(coil, lifecycleOwner, null))
+			.addDelegate(relatedDateItemAD())
+	}
+
+	private class DiffCallback : DiffUtil.ItemCallback<ListModel>() {
+
+		override fun areItemsTheSame(oldItem: ListModel, newItem: ListModel) = when {
+
+			oldItem is DownloadItemModel && newItem is DownloadItemModel -> {
+				oldItem.id == newItem.id
+			}
+
+			oldItem is DateTimeAgo && newItem is DateTimeAgo -> {
+				oldItem == newItem
+			}
+
+			else -> oldItem.javaClass == newItem.javaClass
+		}
+
+		override fun areContentsTheSame(oldItem: ListModel, newItem: ListModel): Boolean {
+			return Intrinsics.areEqual(oldItem, newItem)
+		}
+
+		override fun getChangePayload(oldItem: ListModel, newItem: ListModel): Any? {
+			return when (newItem) {
+				is DownloadItemModel -> {
+					oldItem as DownloadItemModel
+					if (oldItem.workState == newItem.workState) {
+						Unit
+					} else {
+						null
+					}
+				}
+
+				else -> super.getChangePayload(oldItem, newItem)
+			}
+		}
+	}
+
+	companion object {
+		const val ITEM_TYPE_DOWNLOAD = 0
+	}
+}

app/src/main/java/org/koitharu/kotatsu/download/ui/list/DownloadsMenuProvider.kt

@@ -0,0 +1,36 @@
+package org.koitharu.kotatsu.download.ui.list
+
+import android.content.Context
+import android.view.Menu
+import android.view.MenuInflater
+import android.view.MenuItem
+import androidx.core.view.MenuProvider
+import org.koitharu.kotatsu.R
+
+class DownloadsMenuProvider(
+	private val context: Context,
+	private val viewModel: DownloadsViewModel,
+) : MenuProvider {
+
+	override fun onCreateMenu(menu: Menu, menuInflater: MenuInflater) {
+		menuInflater.inflate(R.menu.opt_downloads, menu)
+	}
+
+	override fun onMenuItemSelected(menuItem: MenuItem): Boolean {
+		when (menuItem.itemId) {
+			R.id.action_pause -> viewModel.pauseAll()
+			R.id.action_resume -> viewModel.resumeAll()
+			R.id.action_cancel_all -> viewModel.cancelAll()
+			R.id.action_remove_completed -> viewModel.removeCompleted()
+			else -> return false
+		}
+		return true
+	}
+
+	override fun onPrepareMenu(menu: Menu) {
+		super.onPrepareMenu(menu)
+		menu.findItem(R.id.action_pause)?.isVisible = viewModel.hasActiveWorks.value == true
+		menu.findItem(R.id.action_resume)?.isVisible = viewModel.hasPausedWorks.value == true
+		menu.findItem(R.id.action_cancel_all)?.isVisible = viewModel.hasCancellableWorks.value == true
+	}
+}

app/src/main/java/org/koitharu/kotatsu/download/ui/list/DownloadsSelectionDecoration.kt

@@ -0,0 +1,75 @@
+package org.koitharu.kotatsu.download.ui.list
+
+import android.content.Context
+import android.graphics.Canvas
+import android.graphics.Color
+import android.graphics.Paint
+import android.graphics.RectF
+import android.view.View
+import androidx.cardview.widget.CardView
+import androidx.core.content.ContextCompat
+import androidx.core.graphics.ColorUtils
+import androidx.recyclerview.widget.RecyclerView
+import androidx.recyclerview.widget.RecyclerView.NO_ID
+import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.base.ui.list.decor.AbstractSelectionItemDecoration
+import org.koitharu.kotatsu.utils.ext.getItem
+import org.koitharu.kotatsu.utils.ext.getThemeColor
+import com.google.android.material.R as materialR
+
+class DownloadsSelectionDecoration(context: Context) : AbstractSelectionItemDecoration() {
+
+	private val paint = Paint(Paint.ANTI_ALIAS_FLAG)
+	private val checkIcon = ContextCompat.getDrawable(context, materialR.drawable.ic_mtrl_checked_circle)
+	private val iconOffset = context.resources.getDimensionPixelOffset(R.dimen.card_indicator_offset)
+	private val iconSize = context.resources.getDimensionPixelOffset(R.dimen.card_indicator_size)
+	private val strokeColor = context.getThemeColor(materialR.attr.colorPrimary, Color.RED)
+	private val fillColor = ColorUtils.setAlphaComponent(
+		ColorUtils.blendARGB(strokeColor, context.getThemeColor(materialR.attr.colorSurface), 0.8f),
+		0x74,
+	)
+	private val defaultRadius = context.resources.getDimension(R.dimen.list_selector_corner)
+
+	init {
+		hasBackground = false
+		hasForeground = true
+		isIncludeDecorAndMargins = false
+
+		paint.strokeWidth = context.resources.getDimension(R.dimen.selection_stroke_width)
+		checkIcon?.setTint(strokeColor)
+	}
+
+	override fun getItemId(parent: RecyclerView, child: View): Long {
+		val holder = parent.getChildViewHolder(child) ?: return NO_ID
+		val item = holder.getItem(DownloadItemModel::class.java) ?: return NO_ID
+		return item.id.mostSignificantBits
+	}
+
+	override fun onDrawForeground(
+		canvas: Canvas,
+		parent: RecyclerView,
+		child: View,
+		bounds: RectF,
+		state: RecyclerView.State,
+	) {
+		val isCard = child is CardView
+		val radius = (child as? CardView)?.radius ?: defaultRadius
+		paint.color = fillColor
+		paint.style = Paint.Style.FILL
+		canvas.drawRoundRect(bounds, radius, radius, paint)
+		paint.color = strokeColor
+		paint.style = Paint.Style.STROKE
+		canvas.drawRoundRect(bounds, radius, radius, paint)
+		if (isCard) {
+			checkIcon?.run {
+				setBounds(
+					(bounds.right - iconSize - iconOffset).toInt(),
+					(bounds.top + iconOffset).toInt(),
+					(bounds.right - iconOffset).toInt(),
+					(bounds.top + iconOffset + iconSize).toInt(),
+				)
+				draw(canvas)
+			}
+		}
+	}
+}

app/src/main/java/org/koitharu/kotatsu/download/ui/list/DownloadsViewModel.kt

@@ -0,0 +1,226 @@
+package org.koitharu.kotatsu.download.ui.list
+
+import androidx.collection.LongSparseArray
+import androidx.collection.getOrElse
+import androidx.collection.set
+import androidx.lifecycle.viewModelScope
+import androidx.work.Data
+import androidx.work.WorkInfo
+import dagger.hilt.android.lifecycle.HiltViewModel
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.flow.mapLatest
+import kotlinx.coroutines.flow.stateIn
+import kotlinx.coroutines.plus
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
+import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.base.domain.MangaDataRepository
+import org.koitharu.kotatsu.base.ui.BaseViewModel
+import org.koitharu.kotatsu.core.ui.DateTimeAgo
+import org.koitharu.kotatsu.download.domain.DownloadState
+import org.koitharu.kotatsu.download.ui.worker.DownloadWorker
+import org.koitharu.kotatsu.list.ui.model.EmptyState
+import org.koitharu.kotatsu.list.ui.model.ListModel
+import org.koitharu.kotatsu.list.ui.model.LoadingState
+import org.koitharu.kotatsu.parsers.model.Manga
+import org.koitharu.kotatsu.parsers.util.mapToSet
+import org.koitharu.kotatsu.utils.asFlowLiveData
+import org.koitharu.kotatsu.utils.ext.daysDiff
+import java.util.Date
+import java.util.UUID
+import java.util.concurrent.TimeUnit
+import javax.inject.Inject
+
+@HiltViewModel
+class DownloadsViewModel @Inject constructor(
+	private val workScheduler: DownloadWorker.Scheduler,
+	private val mangaDataRepository: MangaDataRepository,
+) : BaseViewModel() {
+
+	private val mangaCache = LongSparseArray<Manga>()
+	private val cacheMutex = Mutex()
+	private val works = workScheduler.observeWorks()
+		.mapLatest { it.toDownloadsList() }
+		.stateIn(viewModelScope + Dispatchers.Default, SharingStarted.Eagerly, null)
+
+	val items = works.map {
+		it?.toUiList() ?: listOf(LoadingState)
+	}.asFlowLiveData(viewModelScope.coroutineContext + Dispatchers.Default, listOf(LoadingState))
+
+	val hasPausedWorks = works.map {
+		it?.any { x -> x.canResume } == true
+	}.asFlowLiveData(viewModelScope.coroutineContext + Dispatchers.Default, false)
+
+	val hasActiveWorks = works.map {
+		it?.any { x -> x.canPause } == true
+	}.asFlowLiveData(viewModelScope.coroutineContext + Dispatchers.Default, false)
+
+	val hasCancellableWorks = works.map {
+		it?.any { x -> !x.workState.isFinished } == true
+	}.asFlowLiveData(viewModelScope.coroutineContext + Dispatchers.Default, false)
+
+	fun cancel(id: UUID) {
+		launchJob(Dispatchers.Default) {
+			workScheduler.cancel(id)
+		}
+	}
+
+	fun cancel(ids: Set<Long>) {
+		launchJob(Dispatchers.Default) {
+			val snapshot = works.value ?: return@launchJob
+			for (work in snapshot) {
+				if (work.id.mostSignificantBits in ids) {
+					workScheduler.cancel(work.id)
+				}
+			}
+		}
+	}
+
+	fun cancelAll() {
+		launchJob(Dispatchers.Default) {
+			workScheduler.cancelAll()
+		}
+	}
+
+	fun pause(ids: Set<Long>) {
+		val snapshot = works.value ?: return
+		for (work in snapshot) {
+			if (work.id.mostSignificantBits in ids) {
+				workScheduler.pause(work.id)
+			}
+		}
+	}
+
+	fun pauseAll() {
+		val snapshot = works.value ?: return
+		for (work in snapshot) {
+			if (work.canPause) {
+				workScheduler.pause(work.id)
+			}
+		}
+	}
+
+	fun resumeAll() {
+		val snapshot = works.value ?: return
+		for (work in snapshot) {
+			if (work.workState == WorkInfo.State.RUNNING && work.isPaused) {
+				workScheduler.resume(work.id)
+			}
+		}
+	}
+
+	fun resume(ids: Set<Long>) {
+		val snapshot = works.value ?: return
+		for (work in snapshot) {
+			if (work.id.mostSignificantBits in ids) {
+				workScheduler.resume(work.id)
+			}
+		}
+	}
+
+	fun remove(ids: Set<Long>) {
+		launchJob(Dispatchers.Default) {
+			val snapshot = works.value ?: return@launchJob
+			for (work in snapshot) {
+				if (work.id.mostSignificantBits in ids) {
+					workScheduler.delete(work.id)
+				}
+			}
+		}
+	}
+
+	fun removeCompleted() {
+		launchJob(Dispatchers.Default) {
+			workScheduler.removeCompleted()
+		}
+	}
+
+	fun snapshot(ids: Set<Long>): Collection<DownloadItemModel> {
+		return works.value?.filterTo(ArrayList(ids.size)) { x -> x.id.mostSignificantBits in ids }.orEmpty()
+	}
+
+	fun allIds(): Set<Long> = works.value?.mapToSet {
+		it.id.mostSignificantBits
+	} ?: emptySet()
+
+	private suspend fun List<WorkInfo>.toDownloadsList(): List<DownloadItemModel> {
+		if (isEmpty()) {
+			return emptyList()
+		}
+		val list = mapNotNullTo(ArrayList(size)) { it.toUiModel() }
+		list.sortByDescending { it.timestamp }
+		return list
+	}
+
+	private fun List<DownloadItemModel>.toUiList(): List<ListModel> {
+		if (isEmpty()) {
+			return emptyStateList()
+		}
+		val destination = ArrayList<ListModel>((size * 1.4).toInt())
+		var prevDate: DateTimeAgo? = null
+		for (item in this) {
+			val date = timeAgo(item.timestamp)
+			if (prevDate != date) {
+				destination += date
+			}
+			prevDate = date
+			destination += item
+		}
+		return destination
+	}
+
+	private suspend fun WorkInfo.toUiModel(): DownloadItemModel? {
+		val workData = if (outputData == Data.EMPTY) progress else outputData
+		val mangaId = DownloadState.getMangaId(workData)
+		if (mangaId == 0L) return null
+		val manga = getManga(mangaId) ?: return null
+		return DownloadItemModel(
+			id = id,
+			workState = state,
+			manga = manga,
+			error = DownloadState.getError(workData),
+			isIndeterminate = DownloadState.isIndeterminate(workData),
+			isPaused = DownloadState.isPaused(workData),
+			max = DownloadState.getMax(workData),
+			progress = DownloadState.getProgress(workData),
+			eta = DownloadState.getEta(workData),
+			timestamp = DownloadState.getTimestamp(workData),
+			totalChapters = DownloadState.getDownloadedChapters(workData).size,
+		)
+	}
+
+	private fun timeAgo(date: Date): DateTimeAgo {
+		val diff = (System.currentTimeMillis() - date.time).coerceAtLeast(0L)
+		val diffMinutes = TimeUnit.MILLISECONDS.toMinutes(diff).toInt()
+		val diffDays = -date.daysDiff(System.currentTimeMillis())
+		return when {
+			diffMinutes < 3 -> DateTimeAgo.JustNow
+			diffDays < 1 -> DateTimeAgo.Today
+			diffDays == 1 -> DateTimeAgo.Yesterday
+			diffDays < 6 -> DateTimeAgo.DaysAgo(diffDays)
+			else -> DateTimeAgo.Absolute(date)
+		}
+	}
+
+	private fun emptyStateList() = listOf(
+		EmptyState(
+			icon = R.drawable.ic_empty_common,
+			textPrimary = R.string.text_downloads_holder,
+			textSecondary = 0,
+			actionStringRes = 0,
+		),
+	)
+
+	private suspend fun getManga(mangaId: Long): Manga? {
+		mangaCache[mangaId]?.let {
+			return it
+		}
+		return cacheMutex.withLock {
+			mangaCache.getOrElse(mangaId) {
+				mangaDataRepository.findMangaById(mangaId)?.also { mangaCache[mangaId] = it } ?: return null
+			}
+		}
+	}
+}

app/src/main/java/org/koitharu/kotatsu/download/ui/service/DownloadNotification.kt

@@ -1,356 +0,0 @@
-package org.koitharu.kotatsu.download.ui.service
-
-import android.app.Notification
-import android.app.NotificationChannel
-import android.app.NotificationManager
-import android.app.PendingIntent
-import android.content.Context
-import android.os.Build
-import android.text.format.DateUtils
-import android.util.SparseArray
-import androidx.core.app.NotificationCompat
-import androidx.core.app.NotificationManagerCompat
-import androidx.core.app.PendingIntentCompat
-import androidx.core.content.ContextCompat
-import androidx.core.graphics.drawable.toBitmap
-import androidx.core.text.HtmlCompat
-import androidx.core.text.htmlEncode
-import androidx.core.text.parseAsHtml
-import androidx.core.util.forEach
-import androidx.core.util.isNotEmpty
-import androidx.core.util.size
-import com.google.android.material.R as materialR
-import org.koitharu.kotatsu.R
-import org.koitharu.kotatsu.details.ui.DetailsActivity
-import org.koitharu.kotatsu.download.domain.DownloadState
-import org.koitharu.kotatsu.download.ui.DownloadsActivity
-import org.koitharu.kotatsu.parsers.model.Manga
-import org.koitharu.kotatsu.parsers.model.MangaSource
-import org.koitharu.kotatsu.parsers.util.ellipsize
-import org.koitharu.kotatsu.parsers.util.format
-import org.koitharu.kotatsu.search.ui.MangaListActivity
-import org.koitharu.kotatsu.utils.ext.getDisplayMessage
-
-class DownloadNotification(private val context: Context) {
-
-	private val manager = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
-	private val states = SparseArray<DownloadState>()
-	private val groupBuilder = NotificationCompat.Builder(context, CHANNEL_ID)
-
-	private val queueIntent = PendingIntentCompat.getActivity(
-		context,
-		REQUEST_QUEUE,
-		DownloadsActivity.newIntent(context),
-		0,
-		false,
-	)
-
-	private val localListIntent = PendingIntentCompat.getActivity(
-		context,
-		REQUEST_LIST_LOCAL,
-		MangaListActivity.newIntent(context, MangaSource.LOCAL),
-		0,
-		false,
-	)
-
-	init {
-		groupBuilder.setOnlyAlertOnce(true)
-		groupBuilder.setDefaults(0)
-		groupBuilder.color = ContextCompat.getColor(context, R.color.blue_primary)
-		groupBuilder.foregroundServiceBehavior = NotificationCompat.FOREGROUND_SERVICE_IMMEDIATE
-		groupBuilder.setSilent(true)
-		groupBuilder.setGroup(GROUP_ID)
-		groupBuilder.setGroupAlertBehavior(NotificationCompat.GROUP_ALERT_CHILDREN)
-		groupBuilder.setGroupSummary(true)
-		groupBuilder.setContentTitle(context.getString(R.string.downloading_manga))
-	}
-
-	fun buildGroupNotification(): Notification {
-		val style = NotificationCompat.InboxStyle(groupBuilder)
-		var progress = 0f
-		var isAllDone = true
-		var isInProgress = false
-		groupBuilder.setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
-		states.forEach { _, state ->
-			if (state.manga.isNsfw) {
-				groupBuilder.setVisibility(NotificationCompat.VISIBILITY_PRIVATE)
-			}
-			val summary = when (state) {
-				is DownloadState.Cancelled -> {
-					progress++
-					context.getString(R.string.cancelling_)
-				}
-
-				is DownloadState.Done -> {
-					progress++
-					context.getString(R.string.download_complete)
-				}
-
-				is DownloadState.Error -> {
-					isAllDone = false
-					context.getString(R.string.error)
-				}
-
-				is DownloadState.PostProcessing -> {
-					progress++
-					isInProgress = true
-					isAllDone = false
-					context.getString(R.string.processing_)
-				}
-
-				is DownloadState.Preparing -> {
-					isAllDone = false
-					isInProgress = true
-					context.getString(R.string.preparing_)
-				}
-
-				is DownloadState.Progress -> {
-					isAllDone = false
-					isInProgress = true
-					progress += state.percent
-					context.getString(R.string.percent_string_pattern, (state.percent * 100).format())
-				}
-
-				is DownloadState.Queued -> {
-					isAllDone = false
-					isInProgress = true
-					context.getString(R.string.queued)
-				}
-			}
-			style.addLine(
-				context.getString(
-					R.string.download_summary_pattern,
-					state.manga.title.ellipsize(16).htmlEncode(),
-					summary.htmlEncode(),
-				).parseAsHtml(HtmlCompat.FROM_HTML_MODE_LEGACY),
-			)
-		}
-		progress = if (isInProgress) {
-			progress / states.size.toFloat()
-		} else {
-			1f
-		}
-		style.setBigContentTitle(
-			context.getString(if (isAllDone) R.string.download_complete else R.string.downloading_manga),
-		)
-		groupBuilder.setContentText(context.resources.getQuantityString(R.plurals.items, states.size, states.size()))
-		groupBuilder.setNumber(states.size)
-		groupBuilder.setSmallIcon(
-			if (isInProgress) android.R.drawable.stat_sys_download else android.R.drawable.stat_sys_download_done,
-		)
-		groupBuilder.setContentIntent(if (isAllDone) localListIntent else queueIntent)
-		groupBuilder.setAutoCancel(isAllDone)
-		when (progress) {
-			1f -> groupBuilder.setProgress(0, 0, false)
-			0f -> groupBuilder.setProgress(1, 0, true)
-			else -> groupBuilder.setProgress(100, (progress * 100f).toInt(), false)
-		}
-		return groupBuilder.build()
-	}
-
-	fun detach() {
-		if (states.isNotEmpty()) {
-			val notification = buildGroupNotification()
-			manager.notify(ID_GROUP_DETACHED, notification)
-		}
-		manager.cancel(ID_GROUP)
-	}
-
-	fun newItem(startId: Int) = Item(startId)
-
-	inner class Item(
-		private val startId: Int,
-	) {
-
-		private val builder = NotificationCompat.Builder(context, CHANNEL_ID)
-		private val cancelAction = NotificationCompat.Action(
-			materialR.drawable.material_ic_clear_black_24dp,
-			context.getString(android.R.string.cancel),
-			PendingIntentCompat.getBroadcast(
-				context,
-				startId * 2,
-				DownloadService.getCancelIntent(startId),
-				PendingIntent.FLAG_CANCEL_CURRENT,
-				false,
-			),
-		)
-		private val retryAction = NotificationCompat.Action(
-			R.drawable.ic_restart_black,
-			context.getString(R.string.try_again),
-			PendingIntentCompat.getBroadcast(
-				context,
-				startId * 2 + 1,
-				DownloadService.getResumeIntent(startId),
-				PendingIntent.FLAG_CANCEL_CURRENT,
-				false,
-			),
-		)
-
-		init {
-			builder.setOnlyAlertOnce(true)
-			builder.setDefaults(0)
-			builder.color = ContextCompat.getColor(context, R.color.blue_primary)
-			builder.foregroundServiceBehavior = NotificationCompat.FOREGROUND_SERVICE_IMMEDIATE
-			builder.setSilent(true)
-			builder.setGroup(GROUP_ID)
-			builder.setGroupAlertBehavior(NotificationCompat.GROUP_ALERT_CHILDREN)
-		}
-
-		fun notify(state: DownloadState, timeLeft: Long) {
-			builder.setContentTitle(state.manga.title)
-			builder.setContentText(context.getString(R.string.manga_downloading_))
-			builder.setProgress(1, 0, true)
-			builder.setSmallIcon(android.R.drawable.stat_sys_download)
-			builder.setContentIntent(queueIntent)
-			builder.setStyle(null)
-			builder.setLargeIcon(state.cover?.toBitmap())
-			builder.clearActions()
-			builder.setSubText(null)
-			builder.setShowWhen(false)
-			builder.setVisibility(
-				if (state.manga.isNsfw) {
-					NotificationCompat.VISIBILITY_PRIVATE
-				} else {
-					NotificationCompat.VISIBILITY_PUBLIC
-				},
-			)
-			when (state) {
-				is DownloadState.Cancelled -> {
-					builder.setProgress(1, 0, true)
-					builder.setContentText(context.getString(R.string.cancelling_))
-					builder.setContentIntent(null)
-					builder.setStyle(null)
-					builder.setOngoing(true)
-					builder.priority = NotificationCompat.PRIORITY_DEFAULT
-				}
-
-				is DownloadState.Done -> {
-					builder.setProgress(0, 0, false)
-					builder.setContentText(context.getString(R.string.download_complete))
-					builder.setContentIntent(createMangaIntent(context, state.localManga))
-					builder.setAutoCancel(true)
-					builder.setSmallIcon(android.R.drawable.stat_sys_download_done)
-					builder.setCategory(null)
-					builder.setStyle(null)
-					builder.setOngoing(false)
-					builder.setShowWhen(true)
-					builder.setWhen(System.currentTimeMillis())
-					builder.priority = NotificationCompat.PRIORITY_DEFAULT
-				}
-
-				is DownloadState.Error -> {
-					val message = state.error.getDisplayMessage(context.resources)
-					builder.setProgress(0, 0, false)
-					builder.setSmallIcon(android.R.drawable.stat_notify_error)
-					builder.setSubText(context.getString(R.string.error))
-					builder.setContentText(message)
-					builder.setAutoCancel(!state.canRetry)
-					builder.setOngoing(state.canRetry)
-					builder.setCategory(NotificationCompat.CATEGORY_ERROR)
-					builder.setShowWhen(true)
-					builder.setWhen(System.currentTimeMillis())
-					builder.setStyle(NotificationCompat.BigTextStyle().bigText(message))
-					if (state.canRetry) {
-						builder.addAction(cancelAction)
-						builder.addAction(retryAction)
-					}
-					builder.priority = NotificationCompat.PRIORITY_DEFAULT
-				}
-
-				is DownloadState.PostProcessing -> {
-					builder.setProgress(1, 0, true)
-					builder.setContentText(context.getString(R.string.processing_))
-					builder.setStyle(null)
-					builder.setOngoing(true)
-					builder.priority = NotificationCompat.PRIORITY_DEFAULT
-				}
-
-				is DownloadState.Queued -> {
-					builder.setProgress(0, 0, false)
-					builder.setContentText(context.getString(R.string.queued))
-					builder.setStyle(null)
-					builder.setOngoing(true)
-					builder.addAction(cancelAction)
-					builder.priority = NotificationCompat.PRIORITY_LOW
-				}
-
-				is DownloadState.Preparing -> {
-					builder.setProgress(1, 0, true)
-					builder.setContentText(context.getString(R.string.preparing_))
-					builder.setStyle(null)
-					builder.setOngoing(true)
-					builder.addAction(cancelAction)
-					builder.priority = NotificationCompat.PRIORITY_DEFAULT
-				}
-
-				is DownloadState.Progress -> {
-					builder.setProgress(state.max, state.progress, false)
-					val percent = context.getString(R.string.percent_string_pattern, (state.percent * 100).format())
-					if (timeLeft > 0L) {
-						val eta = DateUtils.getRelativeTimeSpanString(timeLeft, 0L, DateUtils.SECOND_IN_MILLIS)
-						builder.setContentText(eta)
-						builder.setSubText(percent)
-					} else {
-						builder.setContentText(percent)
-					}
-					builder.setCategory(NotificationCompat.CATEGORY_PROGRESS)
-					builder.setStyle(null)
-					builder.setOngoing(true)
-					builder.addAction(cancelAction)
-					builder.priority = NotificationCompat.PRIORITY_DEFAULT
-				}
-			}
-			val notification = builder.build()
-			states.append(startId, state)
-			updateGroupNotification()
-			manager.notify(TAG, startId, notification)
-		}
-
-		fun dismiss() {
-			manager.cancel(TAG, startId)
-			states.remove(startId)
-			updateGroupNotification()
-		}
-	}
-
-	private fun updateGroupNotification() {
-		val notification = buildGroupNotification()
-		manager.notify(ID_GROUP, notification)
-	}
-
-	private fun createMangaIntent(context: Context, manga: Manga) = PendingIntentCompat.getActivity(
-		context,
-		manga.hashCode(),
-		DetailsActivity.newIntent(context, manga),
-		PendingIntent.FLAG_CANCEL_CURRENT,
-		false,
-	)
-
-	companion object {
-
-		private const val TAG = "download"
-		private const val CHANNEL_ID = "download"
-		private const val GROUP_ID = "downloads"
-		private const val REQUEST_QUEUE = 6
-		private const val REQUEST_LIST_LOCAL = 7
-		const val ID_GROUP = 9999
-		private const val ID_GROUP_DETACHED = 9998
-
-		fun createChannel(context: Context) {
-			if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
-				val manager = NotificationManagerCompat.from(context)
-				if (manager.getNotificationChannel(CHANNEL_ID) == null) {
-					val channel = NotificationChannel(
-						CHANNEL_ID,
-						context.getString(R.string.downloads),
-						NotificationManager.IMPORTANCE_LOW,
-					)
-					channel.enableVibration(false)
-					channel.enableLights(false)
-					channel.setSound(null, null)
-					manager.createNotificationChannel(channel)
-				}
-			}
-		}
-	}
-}

app/src/main/java/org/koitharu/kotatsu/download/ui/service/DownloadService.kt

@@ -1,262 +0,0 @@
-package org.koitharu.kotatsu.download.ui.service
-
-import android.app.DownloadManager.ACTION_DOWNLOAD_COMPLETE
-import android.content.BroadcastReceiver
-import android.content.Context
-import android.content.Intent
-import android.content.IntentFilter
-import android.os.Binder
-import android.os.IBinder
-import android.os.PowerManager
-import android.view.View
-import androidx.annotation.MainThread
-import androidx.core.app.ServiceCompat
-import androidx.core.content.ContextCompat
-import androidx.lifecycle.DefaultLifecycleObserver
-import androidx.lifecycle.LifecycleOwner
-import androidx.lifecycle.lifecycleScope
-import com.google.android.material.dialog.MaterialAlertDialogBuilder
-import com.google.android.material.snackbar.Snackbar
-import dagger.hilt.android.AndroidEntryPoint
-import kotlinx.coroutines.flow.Flow
-import kotlinx.coroutines.flow.MutableStateFlow
-import kotlinx.coroutines.flow.asStateFlow
-import kotlinx.coroutines.flow.launchIn
-import kotlinx.coroutines.flow.onEach
-import kotlinx.coroutines.flow.transformWhile
-import kotlinx.coroutines.launch
-import org.koitharu.kotatsu.BuildConfig
-import org.koitharu.kotatsu.R
-import org.koitharu.kotatsu.base.ui.BaseService
-import org.koitharu.kotatsu.core.model.parcelable.ParcelableManga
-import org.koitharu.kotatsu.download.domain.DownloadManager
-import org.koitharu.kotatsu.download.domain.DownloadState
-import org.koitharu.kotatsu.download.ui.DownloadsActivity
-import org.koitharu.kotatsu.parsers.model.Manga
-import org.koitharu.kotatsu.utils.ext.getParcelableExtraCompat
-import org.koitharu.kotatsu.utils.ext.throttle
-import org.koitharu.kotatsu.utils.progress.PausingProgressJob
-import org.koitharu.kotatsu.utils.progress.ProgressJob
-import org.koitharu.kotatsu.utils.progress.TimeLeftEstimator
-import java.util.concurrent.TimeUnit
-import javax.inject.Inject
-import kotlin.collections.set
-
-@AndroidEntryPoint
-class DownloadService : BaseService() {
-
-	private lateinit var downloadNotification: DownloadNotification
-	private lateinit var wakeLock: PowerManager.WakeLock
-
-	@Inject
-	lateinit var downloadManager: DownloadManager
-
-	private val jobs = LinkedHashMap<Int, PausingProgressJob<DownloadState>>()
-	private val jobCount = MutableStateFlow(0)
-	private val controlReceiver = ControlReceiver()
-
-	override fun onCreate() {
-		super.onCreate()
-		downloadNotification = DownloadNotification(this)
-		wakeLock = (applicationContext.getSystemService(Context.POWER_SERVICE) as PowerManager)
-			.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "kotatsu:downloading")
-		wakeLock.acquire(TimeUnit.HOURS.toMillis(8))
-		DownloadNotification.createChannel(this)
-		startForeground(DownloadNotification.ID_GROUP, downloadNotification.buildGroupNotification())
-		val intentFilter = IntentFilter()
-		intentFilter.addAction(ACTION_DOWNLOAD_CANCEL)
-		intentFilter.addAction(ACTION_DOWNLOAD_RESUME)
-		ContextCompat.registerReceiver(this, controlReceiver, intentFilter, ContextCompat.RECEIVER_NOT_EXPORTED)
-	}
-
-	override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
-		super.onStartCommand(intent, flags, startId)
-		val manga = intent?.getParcelableExtraCompat<ParcelableManga>(EXTRA_MANGA)?.manga
-		val chapters = intent?.getLongArrayExtra(EXTRA_CHAPTERS_IDS)
-		return if (manga != null) {
-			jobs[startId] = downloadManga(startId, manga, chapters)
-			jobCount.value = jobs.size
-			START_REDELIVER_INTENT
-		} else {
-			stopSelfIfIdle()
-			START_NOT_STICKY
-		}
-	}
-
-	override fun onBind(intent: Intent): IBinder {
-		super.onBind(intent)
-		return DownloadBinder(this)
-	}
-
-	override fun onDestroy() {
-		unregisterReceiver(controlReceiver)
-		if (wakeLock.isHeld) {
-			wakeLock.release()
-		}
-		super.onDestroy()
-	}
-
-	private fun downloadManga(
-		startId: Int,
-		manga: Manga,
-		chaptersIds: LongArray?,
-	): PausingProgressJob<DownloadState> {
-		val job = downloadManager.downloadManga(manga, chaptersIds, startId)
-		listenJob(job)
-		return job
-	}
-
-	private fun listenJob(job: ProgressJob<DownloadState>) {
-		lifecycleScope.launch {
-			val startId = job.progressValue.startId
-			val notificationItem = downloadNotification.newItem(startId)
-			try {
-				val timeLeftEstimator = TimeLeftEstimator()
-				notificationItem.notify(job.progressValue, -1L)
-				job.progressAsFlow()
-					.onEach { state ->
-						if (state is DownloadState.Progress) {
-							timeLeftEstimator.tick(value = state.progress, total = state.max)
-						} else {
-							timeLeftEstimator.emptyTick()
-						}
-					}
-					.throttle { state -> if (state is DownloadState.Progress) 400L else 0L }
-					.whileActive()
-					.collect { state ->
-						val timeLeft = timeLeftEstimator.getEstimatedTimeLeft()
-						notificationItem.notify(state, timeLeft)
-					}
-				job.join()
-			} finally {
-				(job.progressValue as? DownloadState.Done)?.let {
-					sendBroadcast(
-						Intent(ACTION_DOWNLOAD_COMPLETE)
-							.putExtra(EXTRA_MANGA, ParcelableManga(it.localManga, withChapters = false)),
-					)
-				}
-				if (job.isCancelled) {
-					notificationItem.dismiss()
-					if (jobs.remove(startId) != null) {
-						jobCount.value = jobs.size
-					}
-				} else {
-					notificationItem.notify(job.progressValue, -1L)
-				}
-			}
-		}.invokeOnCompletion {
-			stopSelfIfIdle()
-		}
-	}
-
-	private fun Flow<DownloadState>.whileActive(): Flow<DownloadState> = transformWhile { state ->
-		emit(state)
-		!state.isTerminal
-	}
-
-	@MainThread
-	private fun stopSelfIfIdle() {
-		if (jobs.any { (_, job) -> job.isActive }) {
-			return
-		}
-		downloadNotification.detach()
-		ServiceCompat.stopForeground(this, ServiceCompat.STOP_FOREGROUND_REMOVE)
-		stopSelf()
-	}
-
-	inner class ControlReceiver : BroadcastReceiver() {
-
-		override fun onReceive(context: Context, intent: Intent?) {
-			when (intent?.action) {
-				ACTION_DOWNLOAD_CANCEL -> {
-					val cancelId = intent.getIntExtra(EXTRA_CANCEL_ID, 0)
-					jobs[cancelId]?.cancel()
-				}
-
-				ACTION_DOWNLOAD_RESUME -> {
-					val cancelId = intent.getIntExtra(EXTRA_CANCEL_ID, 0)
-					jobs[cancelId]?.resume()
-				}
-			}
-		}
-	}
-
-	class DownloadBinder(service: DownloadService) : Binder(), DefaultLifecycleObserver {
-
-		private var downloadsStateFlow = MutableStateFlow<List<PausingProgressJob<DownloadState>>>(emptyList())
-
-		init {
-			service.lifecycle.addObserver(this)
-			service.jobCount.onEach {
-				downloadsStateFlow.value = service.jobs.values.toList()
-			}.launchIn(service.lifecycleScope)
-		}
-
-		override fun onDestroy(owner: LifecycleOwner) {
-			owner.lifecycle.removeObserver(this)
-			downloadsStateFlow.value = emptyList()
-			super.onDestroy(owner)
-		}
-
-		val downloads
-			get() = downloadsStateFlow.asStateFlow()
-	}
-
-	companion object {
-
-		private const val ACTION_DOWNLOAD_CANCEL = "${BuildConfig.APPLICATION_ID}.action.ACTION_DOWNLOAD_CANCEL"
-		private const val ACTION_DOWNLOAD_RESUME = "${BuildConfig.APPLICATION_ID}.action.ACTION_DOWNLOAD_RESUME"
-
-		const val EXTRA_MANGA = "manga"
-		private const val EXTRA_CHAPTERS_IDS = "chapters_ids"
-		private const val EXTRA_CANCEL_ID = "cancel_id"
-
-		fun start(view: View, manga: Manga, chaptersIds: Collection<Long>? = null) {
-			if (chaptersIds?.isEmpty() == true) {
-				return
-			}
-			val intent = Intent(view.context, DownloadService::class.java)
-			intent.putExtra(EXTRA_MANGA, ParcelableManga(manga, withChapters = false))
-			if (chaptersIds != null) {
-				intent.putExtra(EXTRA_CHAPTERS_IDS, chaptersIds.toLongArray())
-			}
-			ContextCompat.startForegroundService(view.context, intent)
-			showStartedSnackbar(view)
-		}
-
-		fun start(view: View, manga: Collection<Manga>) {
-			if (manga.isEmpty()) {
-				return
-			}
-			for (item in manga) {
-				val intent = Intent(view.context, DownloadService::class.java)
-				intent.putExtra(EXTRA_MANGA, ParcelableManga(item, withChapters = false))
-				ContextCompat.startForegroundService(view.context, intent)
-			}
-			showStartedSnackbar(view)
-		}
-
-		fun confirmAndStart(view: View, items: Set<Manga>) {
-			MaterialAlertDialogBuilder(view.context)
-				.setTitle(R.string.save_manga)
-				.setMessage(R.string.batch_manga_save_confirm)
-				.setNegativeButton(android.R.string.cancel, null)
-				.setPositiveButton(R.string.save) { _, _ ->
-					start(view, items)
-				}.show()
-		}
-
-		fun getCancelIntent(startId: Int) = Intent(ACTION_DOWNLOAD_CANCEL)
-			.putExtra(EXTRA_CANCEL_ID, startId)
-
-		fun getResumeIntent(startId: Int) = Intent(ACTION_DOWNLOAD_RESUME)
-			.putExtra(EXTRA_CANCEL_ID, startId)
-
-		private fun showStartedSnackbar(view: View) {
-			Snackbar.make(view, R.string.download_started, Snackbar.LENGTH_LONG)
-				.setAction(R.string.details) {
-					it.context.startActivity(DownloadsActivity.newIntent(it.context))
-				}.show()
-		}
-	}
-}

app/src/main/java/org/koitharu/kotatsu/download/ui/worker/DownloadNotificationFactory.kt

@@ -0,0 +1,260 @@
+package org.koitharu.kotatsu.download.ui.worker
+
+import android.app.Notification
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.app.PendingIntent
+import android.content.Context
+import android.graphics.drawable.Drawable
+import android.os.Build
+import android.text.format.DateUtils
+import androidx.core.app.NotificationCompat
+import androidx.core.app.NotificationManagerCompat
+import androidx.core.app.PendingIntentCompat
+import androidx.core.content.ContextCompat
+import androidx.core.graphics.drawable.toBitmap
+import androidx.work.WorkManager
+import coil.ImageLoader
+import coil.request.ImageRequest
+import coil.size.Scale
+import dagger.assisted.Assisted
+import dagger.assisted.AssistedFactory
+import dagger.assisted.AssistedInject
+import dagger.hilt.android.qualifiers.ApplicationContext
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
+import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.details.ui.DetailsActivity
+import org.koitharu.kotatsu.download.domain.DownloadState
+import org.koitharu.kotatsu.download.ui.list.DownloadsActivity
+import org.koitharu.kotatsu.parsers.model.Manga
+import org.koitharu.kotatsu.parsers.model.MangaSource
+import org.koitharu.kotatsu.parsers.util.format
+import org.koitharu.kotatsu.parsers.util.runCatchingCancellable
+import org.koitharu.kotatsu.search.ui.MangaListActivity
+import org.koitharu.kotatsu.utils.ext.getDrawableOrThrow
+import org.koitharu.kotatsu.utils.ext.printStackTraceDebug
+import java.util.UUID
+import com.google.android.material.R as materialR
+
+private const val CHANNEL_ID = "download"
+private const val GROUP_ID = "downloads"
+
+class DownloadNotificationFactory @AssistedInject constructor(
+	@ApplicationContext private val context: Context,
+	private val coil: ImageLoader,
+	@Assisted private val uuid: UUID,
+) {
+
+	private val covers = HashMap<Manga, Drawable>()
+	private val builder = NotificationCompat.Builder(context, CHANNEL_ID)
+	private val mutex = Mutex()
+
+	private val coverWidth = context.resources.getDimensionPixelSize(
+		androidx.core.R.dimen.compat_notification_large_icon_max_width,
+	)
+	private val coverHeight = context.resources.getDimensionPixelSize(
+		androidx.core.R.dimen.compat_notification_large_icon_max_height,
+	)
+	private val queueIntent = PendingIntentCompat.getActivity(
+		context,
+		0,
+		DownloadsActivity.newIntent(context),
+		0,
+		false,
+	)
+
+	private val actionCancel by lazy {
+		NotificationCompat.Action(
+			materialR.drawable.material_ic_clear_black_24dp,
+			context.getString(android.R.string.cancel),
+			WorkManager.getInstance(context).createCancelPendingIntent(uuid),
+		)
+	}
+
+	private val actionPause by lazy {
+		NotificationCompat.Action(
+			R.drawable.ic_action_pause,
+			context.getString(R.string.pause),
+			PausingReceiver.createPausePendingIntent(context, uuid),
+		)
+	}
+
+	private val actionResume by lazy {
+		NotificationCompat.Action(
+			R.drawable.ic_action_resume,
+			context.getString(R.string.resume),
+			PausingReceiver.createResumePendingIntent(context, uuid),
+		)
+	}
+
+	init {
+		createChannel()
+		builder.setOnlyAlertOnce(true)
+		builder.setDefaults(0)
+		builder.color = ContextCompat.getColor(context, R.color.blue_primary)
+		builder.foregroundServiceBehavior = NotificationCompat.FOREGROUND_SERVICE_IMMEDIATE
+		builder.setSilent(true)
+		builder.setGroup(GROUP_ID)
+		builder.setGroupAlertBehavior(NotificationCompat.GROUP_ALERT_CHILDREN)
+		builder.priority = NotificationCompat.PRIORITY_DEFAULT
+	}
+
+	suspend fun create(state: DownloadState?): Notification = mutex.withLock {
+		builder.setContentTitle(state?.manga?.title ?: context.getString(R.string.preparing_))
+		builder.setContentText(context.getString(R.string.manga_downloading_))
+		builder.setProgress(1, 0, true)
+		builder.setSmallIcon(android.R.drawable.stat_sys_download)
+		builder.setContentIntent(queueIntent)
+		builder.setStyle(null)
+		builder.setLargeIcon(if (state != null) getCover(state.manga)?.toBitmap() else null)
+		builder.clearActions()
+		builder.setSubText(null)
+		builder.setShowWhen(false)
+		builder.setVisibility(
+			if (state != null && state.manga.isNsfw) {
+				NotificationCompat.VISIBILITY_PRIVATE
+			} else {
+				NotificationCompat.VISIBILITY_PUBLIC
+			},
+		)
+		when {
+			state == null -> Unit
+			state.localManga != null -> { // downloaded, final state
+				builder.setProgress(0, 0, false)
+				builder.setContentText(context.getString(R.string.download_complete))
+				builder.setContentIntent(createMangaIntent(context, state.localManga.manga))
+				builder.setAutoCancel(true)
+				builder.setSmallIcon(android.R.drawable.stat_sys_download_done)
+				builder.setCategory(null)
+				builder.setStyle(null)
+				builder.setOngoing(false)
+				builder.setShowWhen(true)
+				builder.setWhen(System.currentTimeMillis())
+			}
+
+			state.isStopped -> {
+				builder.setProgress(0, 0, false)
+				builder.setContentText(context.getString(R.string.queued))
+				builder.setCategory(NotificationCompat.CATEGORY_PROGRESS)
+				builder.setStyle(null)
+				builder.setOngoing(true)
+				builder.setSmallIcon(R.drawable.ic_stat_paused)
+				builder.addAction(actionCancel)
+			}
+
+			state.isPaused -> { // paused (with error or manually)
+				builder.setProgress(state.max, state.progress, false)
+				val percent = if (state.percent >= 0) {
+					context.getString(R.string.percent_string_pattern, (state.percent * 100).format())
+				} else {
+					null
+				}
+				if (state.error != null) {
+					builder.setContentText(state.error)
+					builder.setSubText(percent)
+				} else {
+					builder.setContentText(percent)
+				}
+				builder.setCategory(NotificationCompat.CATEGORY_PROGRESS)
+				builder.setStyle(null)
+				builder.setOngoing(true)
+				builder.setSmallIcon(R.drawable.ic_stat_paused)
+				builder.addAction(actionCancel)
+				builder.addAction(actionResume)
+			}
+
+			state.error != null -> { // error, final state
+				builder.setProgress(0, 0, false)
+				builder.setSmallIcon(android.R.drawable.stat_notify_error)
+				builder.setSubText(context.getString(R.string.error))
+				builder.setContentText(state.error)
+				builder.setAutoCancel(true)
+				builder.setOngoing(false)
+				builder.setCategory(NotificationCompat.CATEGORY_ERROR)
+				builder.setShowWhen(true)
+				builder.setWhen(System.currentTimeMillis())
+				builder.setStyle(NotificationCompat.BigTextStyle().bigText(state.error))
+			}
+
+			else -> {
+				builder.setProgress(state.max, state.progress, false)
+				val percent = if (state.percent >= 0f) {
+					context.getString(R.string.percent_string_pattern, (state.percent * 100).format())
+				} else {
+					null
+				}
+				if (state.eta > 0L) {
+					val eta = DateUtils.getRelativeTimeSpanString(
+						state.eta,
+						System.currentTimeMillis(),
+						DateUtils.SECOND_IN_MILLIS,
+					)
+					builder.setContentText(eta)
+					builder.setSubText(percent)
+				} else {
+					builder.setContentText(percent)
+				}
+				builder.setCategory(NotificationCompat.CATEGORY_PROGRESS)
+				builder.setStyle(null)
+				builder.setOngoing(true)
+				builder.addAction(actionCancel)
+				builder.addAction(actionPause)
+			}
+		}
+		return builder.build()
+	}
+
+	private fun createMangaIntent(context: Context, manga: Manga?) = PendingIntentCompat.getActivity(
+		context,
+		manga.hashCode(),
+		if (manga != null) {
+			DetailsActivity.newIntent(context, manga)
+		} else {
+			MangaListActivity.newIntent(context, MangaSource.LOCAL)
+		},
+		PendingIntent.FLAG_CANCEL_CURRENT,
+		false,
+	)
+
+	private suspend fun getCover(manga: Manga) = covers[manga] ?: run {
+		runCatchingCancellable {
+			coil.execute(
+				ImageRequest.Builder(context)
+					.data(manga.coverUrl)
+					.allowHardware(false)
+					.tag(manga.source)
+					.size(coverWidth, coverHeight)
+					.scale(Scale.FILL)
+					.build(),
+			).getDrawableOrThrow()
+		}.onSuccess {
+			covers[manga] = it
+		}.onFailure {
+			it.printStackTraceDebug()
+		}.getOrNull()
+	}
+
+	private fun createChannel() {
+		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+			val manager = NotificationManagerCompat.from(context)
+			if (manager.getNotificationChannel(CHANNEL_ID) == null) {
+				val channel = NotificationChannel(
+					CHANNEL_ID,
+					context.getString(R.string.downloads),
+					NotificationManager.IMPORTANCE_LOW,
+				)
+				channel.enableVibration(false)
+				channel.enableLights(false)
+				channel.setSound(null, null)
+				manager.createNotificationChannel(channel)
+			}
+		}
+	}
+
+	@AssistedFactory
+	interface Factory {
+
+		fun create(uuid: UUID): DownloadNotificationFactory
+	}
+}

app/src/main/java/org/koitharu/kotatsu/download/ui/worker/DownloadStartedObserver.kt

@@ -0,0 +1,25 @@
+package org.koitharu.kotatsu.download.ui.worker
+
+import android.view.View
+import androidx.lifecycle.Observer
+import com.google.android.material.snackbar.Snackbar
+import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.download.ui.list.DownloadsActivity
+import org.koitharu.kotatsu.main.ui.owners.BottomNavOwner
+import org.koitharu.kotatsu.utils.ext.findActivity
+
+class DownloadStartedObserver(
+	private val snackbarHost: View,
+) : Observer<Unit> {
+
+	override fun onChanged(value: Unit) {
+		val snackbar = Snackbar.make(snackbarHost, R.string.download_started, Snackbar.LENGTH_LONG)
+		(snackbarHost.context.findActivity() as? BottomNavOwner)?.let {
+			snackbar.anchorView = it.bottomNav
+		}
+		snackbar.setAction(R.string.details) {
+			it.context.startActivity(DownloadsActivity.newIntent(it.context))
+		}
+		snackbar.show()
+	}
+}

app/src/main/java/org/koitharu/kotatsu/download/ui/worker/DownloadWorker.kt

@@ -0,0 +1,454 @@
+package org.koitharu.kotatsu.download.ui.worker
+
+import android.app.NotificationManager
+import android.content.Context
+import android.webkit.MimeTypeMap
+import androidx.core.content.ContextCompat
+import androidx.hilt.work.HiltWorker
+import androidx.lifecycle.asFlow
+import androidx.work.BackoffPolicy
+import androidx.work.Constraints
+import androidx.work.CoroutineWorker
+import androidx.work.Data
+import androidx.work.ForegroundInfo
+import androidx.work.NetworkType
+import androidx.work.OneTimeWorkRequestBuilder
+import androidx.work.OutOfQuotaPolicy
+import androidx.work.WorkInfo
+import androidx.work.WorkManager
+import androidx.work.WorkerParameters
+import androidx.work.await
+import dagger.Reusable
+import dagger.assisted.Assisted
+import dagger.assisted.AssistedInject
+import dagger.hilt.android.qualifiers.ApplicationContext
+import kotlinx.coroutines.CancellationException
+import kotlinx.coroutines.NonCancellable
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.withContext
+import okhttp3.OkHttpClient
+import okhttp3.Request
+import okhttp3.internal.closeQuietly
+import okio.IOException
+import okio.buffer
+import okio.sink
+import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.base.domain.MangaDataRepository
+import org.koitharu.kotatsu.core.network.CommonHeaders
+import org.koitharu.kotatsu.core.parser.MangaRepository
+import org.koitharu.kotatsu.core.prefs.AppSettings
+import org.koitharu.kotatsu.download.domain.DownloadState
+import org.koitharu.kotatsu.local.data.LocalManga
+import org.koitharu.kotatsu.local.data.LocalStorageChanges
+import org.koitharu.kotatsu.local.data.PagesCache
+import org.koitharu.kotatsu.local.data.input.LocalMangaInput
+import org.koitharu.kotatsu.local.data.output.LocalMangaOutput
+import org.koitharu.kotatsu.local.domain.LocalMangaRepository
+import org.koitharu.kotatsu.parsers.model.Manga
+import org.koitharu.kotatsu.parsers.model.MangaChapter
+import org.koitharu.kotatsu.parsers.model.MangaSource
+import org.koitharu.kotatsu.parsers.util.await
+import org.koitharu.kotatsu.parsers.util.mapToSet
+import org.koitharu.kotatsu.utils.Throttler
+import org.koitharu.kotatsu.utils.WorkManagerHelper
+import org.koitharu.kotatsu.utils.ext.deleteAwait
+import org.koitharu.kotatsu.utils.ext.getDisplayMessage
+import org.koitharu.kotatsu.utils.ext.ifNullOrEmpty
+import org.koitharu.kotatsu.utils.ext.printStackTraceDebug
+import org.koitharu.kotatsu.utils.ext.runCatchingCancellable
+import org.koitharu.kotatsu.utils.ext.writeAllCancellable
+import org.koitharu.kotatsu.utils.progress.TimeLeftEstimator
+import java.io.File
+import java.util.UUID
+import java.util.concurrent.TimeUnit
+import javax.inject.Inject
+
+@HiltWorker
+class DownloadWorker @AssistedInject constructor(
+	@Assisted appContext: Context,
+	@Assisted params: WorkerParameters,
+	private val okHttp: OkHttpClient,
+	private val cache: PagesCache,
+	private val localMangaRepository: LocalMangaRepository,
+	private val mangaDataRepository: MangaDataRepository,
+	private val settings: AppSettings,
+	private val mangaRepositoryFactory: MangaRepository.Factory,
+	@LocalStorageChanges private val localStorageChanges: MutableSharedFlow<LocalManga?>,
+	notificationFactoryFactory: DownloadNotificationFactory.Factory,
+) : CoroutineWorker(appContext, params) {
+
+	private val notificationFactory = notificationFactoryFactory.create(params.id)
+	private val notificationManager = appContext.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
+
+	@Volatile
+	private var lastPublishedState: DownloadState? = null
+	private val currentState: DownloadState
+		get() = checkNotNull(lastPublishedState)
+
+	private val pausingHandle = PausingHandle()
+	private val timeLeftEstimator = TimeLeftEstimator()
+	private val notificationThrottler = Throttler(400)
+	private val pausingReceiver = PausingReceiver(params.id, pausingHandle)
+
+	override suspend fun doWork(): Result {
+		setForeground(getForegroundInfo())
+		val mangaId = inputData.getLong(MANGA_ID, 0L)
+		val manga = mangaDataRepository.findMangaById(mangaId) ?: return Result.failure()
+		val chaptersIds = inputData.getLongArray(CHAPTERS_IDS)?.takeUnless { it.isEmpty() }
+		val downloadedIds = getDoneChapters()
+		lastPublishedState = DownloadState(manga, isIndeterminate = true)
+		return try {
+			downloadMangaImpl(chaptersIds, downloadedIds)
+			Result.success(currentState.toWorkData())
+		} catch (e: CancellationException) {
+			withContext(NonCancellable) {
+				val notification = notificationFactory.create(currentState.copy(isStopped = true))
+				notificationManager.notify(id.hashCode(), notification)
+			}
+			throw e
+		} catch (e: IOException) {
+			e.printStackTraceDebug()
+			Result.retry()
+		} catch (e: Exception) {
+			e.printStackTraceDebug()
+			Result.failure(
+				currentState.copy(
+					error = e.getDisplayMessage(applicationContext.resources),
+					eta = -1L,
+				).toWorkData(),
+			)
+		} finally {
+			notificationManager.cancel(id.hashCode())
+		}
+	}
+
+	override suspend fun getForegroundInfo() = ForegroundInfo(
+		id.hashCode(),
+		notificationFactory.create(lastPublishedState),
+	)
+
+	private suspend fun downloadMangaImpl(
+		includedIds: LongArray?,
+		excludedIds: LongArray,
+	) {
+		var manga = currentState.manga
+		val chaptersToSkip = excludedIds.toMutableSet()
+		withMangaLock(manga) {
+			ContextCompat.registerReceiver(
+				applicationContext,
+				pausingReceiver,
+				PausingReceiver.createIntentFilter(id),
+				ContextCompat.RECEIVER_NOT_EXPORTED,
+			)
+			val destination = localMangaRepository.getOutputDir(manga)
+			checkNotNull(destination) { applicationContext.getString(R.string.cannot_find_available_storage) }
+			val tempFileName = "${manga.id}_$id.tmp"
+			var output: LocalMangaOutput? = null
+			try {
+				if (manga.source == MangaSource.LOCAL) {
+					manga = localMangaRepository.getRemoteManga(manga)
+						?: error("Cannot obtain remote manga instance")
+				}
+				val repo = mangaRepositoryFactory.create(manga.source)
+				val mangaDetails = if (manga.chapters.isNullOrEmpty()) repo.getDetails(manga) else manga
+				output = LocalMangaOutput.getOrCreate(destination, mangaDetails)
+				val coverUrl = mangaDetails.largeCoverUrl.ifNullOrEmpty { mangaDetails.coverUrl }
+				if (coverUrl.isNotEmpty()) {
+					downloadFile(coverUrl, destination, tempFileName, repo.source).let { file ->
+						output.addCover(file, MimeTypeMap.getFileExtensionFromUrl(coverUrl))
+					}
+				}
+				val chapters = getChapters(mangaDetails, includedIds)
+				for ((chapterIndex, chapter) in chapters.withIndex()) {
+					if (chaptersToSkip.remove(chapter.id)) {
+						publishState(
+							currentState.copy(
+								downloadedChapters = currentState.downloadedChapters + chapter.id,
+							),
+						)
+						continue
+					}
+					val pages = runFailsafe(pausingHandle) {
+						repo.getPages(chapter)
+					}
+					for ((pageIndex, page) in pages.withIndex()) {
+						runFailsafe(pausingHandle) {
+							val url = repo.getPageUrl(page)
+							val file = cache.get(url)
+								?: downloadFile(url, destination, tempFileName, repo.source)
+							output.addPage(
+								chapter = chapter,
+								file = file,
+								pageNumber = pageIndex,
+								ext = MimeTypeMap.getFileExtensionFromUrl(url),
+							)
+						}
+						publishState(
+							currentState.copy(
+								totalChapters = chapters.size,
+								currentChapter = chapterIndex,
+								totalPages = pages.size,
+								currentPage = pageIndex,
+								isIndeterminate = false,
+								eta = timeLeftEstimator.getEta(),
+							),
+						)
+
+						if (settings.isDownloadsSlowdownEnabled) {
+							delay(SLOWDOWN_DELAY)
+						}
+					}
+					if (output.flushChapter(chapter)) {
+						runCatchingCancellable {
+							localStorageChanges.emit(LocalMangaInput.of(output.rootFile).getManga())
+						}.onFailure(Throwable::printStackTraceDebug)
+					}
+					publishState(
+						currentState.copy(
+							downloadedChapters = currentState.downloadedChapters + chapter.id,
+						),
+					)
+				}
+				publishState(currentState.copy(isIndeterminate = true, eta = -1L))
+				output.mergeWithExisting()
+				output.finish()
+				val localManga = LocalMangaInput.of(output.rootFile).getManga()
+				localStorageChanges.emit(localManga)
+				publishState(currentState.copy(localManga = localManga, eta = -1L))
+			} catch (e: Exception) {
+				if (e !is CancellationException) {
+					publishState(currentState.copy(error = e.getDisplayMessage(applicationContext.resources)))
+				}
+				throw e
+			} finally {
+				withContext(NonCancellable) {
+					applicationContext.unregisterReceiver(pausingReceiver)
+					output?.closeQuietly()
+					output?.cleanup()
+					File(destination, tempFileName).deleteAwait()
+				}
+			}
+		}
+	}
+
+	private suspend fun <R> runFailsafe(
+		pausingHandle: PausingHandle,
+		block: suspend () -> R,
+	): R {
+		if (pausingHandle.isPaused) {
+			publishState(currentState.copy(isPaused = true, eta = -1L))
+			pausingHandle.awaitResumed()
+			publishState(currentState.copy(isPaused = false))
+		}
+		var countDown = MAX_FAILSAFE_ATTEMPTS
+		failsafe@ while (true) {
+			try {
+				return block()
+			} catch (e: IOException) {
+				if (countDown <= 0) {
+					publishState(
+						currentState.copy(
+							isPaused = true,
+							error = e.getDisplayMessage(applicationContext.resources),
+							eta = -1L,
+						),
+					)
+					countDown = MAX_FAILSAFE_ATTEMPTS
+					pausingHandle.pause()
+					pausingHandle.awaitResumed()
+					publishState(currentState.copy(isPaused = false, error = null))
+				} else {
+					countDown--
+					delay(DOWNLOAD_ERROR_DELAY)
+				}
+			}
+		}
+	}
+
+	private suspend fun downloadFile(
+		url: String,
+		destination: File,
+		tempFileName: String,
+		source: MangaSource,
+	): File {
+		val request = Request.Builder()
+			.url(url)
+			.tag(MangaSource::class.java, source)
+			.header(CommonHeaders.ACCEPT, "image/webp,image/png;q=0.9,image/jpeg,*/*;q=0.8")
+			.cacheControl(CommonHeaders.CACHE_CONTROL_NO_STORE)
+			.get()
+			.build()
+		val call = okHttp.newCall(request)
+		val file = File(destination, tempFileName)
+		val response = call.clone().await()
+		checkNotNull(response.body).use { body ->
+			file.sink(append = false).buffer().use {
+				it.writeAllCancellable(body.source())
+			}
+		}
+		return file
+	}
+
+	private suspend fun publishState(state: DownloadState) {
+		val previousState = currentState
+		lastPublishedState = state
+		if (previousState.isParticularProgress && state.isParticularProgress) {
+			timeLeftEstimator.tick(state.progress, state.max)
+		} else {
+			timeLeftEstimator.emptyTick()
+			notificationThrottler.reset()
+		}
+		val notification = notificationFactory.create(state)
+		if (state.isFinalState) {
+			notificationManager.notify(id.toString(), id.hashCode(), notification)
+		} else if (notificationThrottler.throttle()) {
+			notificationManager.notify(id.hashCode(), notification)
+		} else {
+			return
+		}
+		setProgress(state.toWorkData())
+	}
+
+	private suspend fun getDoneChapters(): LongArray {
+		val work = WorkManagerHelper(WorkManager.getInstance(applicationContext)).getWorkInfoById(id)
+			?: return LongArray(0)
+		return DownloadState.getDownloadedChapters(work.progress)
+	}
+
+	private fun getChapters(
+		manga: Manga,
+		includedIds: LongArray?,
+	): List<MangaChapter> {
+		val chapters = checkNotNull(manga.chapters?.toMutableList()) {
+			"Chapters list must not be null"
+		}
+		if (includedIds != null) {
+			val chaptersIdsSet = includedIds.toMutableSet()
+			chapters.retainAll { x -> chaptersIdsSet.remove(x.id) }
+			check(chaptersIdsSet.isEmpty()) {
+				"${chaptersIdsSet.size} of ${includedIds.size} requested chapters not found in manga"
+			}
+		}
+		check(chapters.isNotEmpty()) { "Chapters list must not be empty" }
+		return chapters
+	}
+
+	private suspend inline fun <T> withMangaLock(manga: Manga, block: () -> T) = try {
+		localMangaRepository.lockManga(manga.id)
+		block()
+	} finally {
+		localMangaRepository.unlockManga(manga.id)
+	}
+
+	@Reusable
+	class Scheduler @Inject constructor(
+		@ApplicationContext private val context: Context,
+		private val dataRepository: MangaDataRepository,
+		private val settings: AppSettings,
+	) {
+
+		private val workManager: WorkManager
+			inline get() = WorkManager.getInstance(context)
+
+		suspend fun schedule(manga: Manga, chaptersIds: Collection<Long>?) {
+			dataRepository.storeManga(manga)
+			val data = Data.Builder()
+				.putLong(MANGA_ID, manga.id)
+			if (!chaptersIds.isNullOrEmpty()) {
+				data.putLongArray(CHAPTERS_IDS, chaptersIds.toLongArray())
+			}
+			scheduleImpl(listOf(data.build()))
+		}
+
+		suspend fun schedule(manga: Collection<Manga>) {
+			val data = manga.map {
+				dataRepository.storeManga(it)
+				Data.Builder()
+					.putLong(MANGA_ID, it.id)
+					.build()
+			}
+			scheduleImpl(data)
+		}
+
+		fun observeWorks(): Flow<List<WorkInfo>> = workManager
+			.getWorkInfosByTagLiveData(TAG)
+			.asFlow()
+
+		suspend fun cancel(id: UUID) {
+			workManager.cancelWorkById(id).await()
+		}
+
+		suspend fun cancelAll() {
+			workManager.cancelAllWorkByTag(TAG).await()
+		}
+
+		fun pause(id: UUID) {
+			val intent = PausingReceiver.getPauseIntent(id)
+			context.sendBroadcast(intent)
+		}
+
+		fun resume(id: UUID) {
+			val intent = PausingReceiver.getResumeIntent(id)
+			context.sendBroadcast(intent)
+		}
+
+		suspend fun delete(id: UUID) {
+			WorkManagerHelper(workManager).deleteWork(id)
+		}
+
+		suspend fun removeCompleted() {
+			val helper = WorkManagerHelper(workManager)
+			val finishedWorks = helper.getFinishedWorkInfosByTag(TAG)
+			helper.deleteWorks(finishedWorks.mapToSet { it.id })
+		}
+
+		suspend fun updateConstraints() {
+			val constraints = Constraints.Builder()
+				.setRequiresStorageNotLow(true)
+				.setRequiredNetworkType(if (settings.isDownloadsWiFiOnly) NetworkType.UNMETERED else NetworkType.CONNECTED)
+				.build()
+			val helper = WorkManagerHelper(workManager)
+			val works = helper.getWorkInfosByTag(TAG)
+			for (work in works) {
+				if (work.state.isFinished) {
+					continue
+				}
+				val request = OneTimeWorkRequestBuilder<DownloadWorker>()
+					.setConstraints(constraints)
+					.setId(work.id)
+					.build()
+				helper.updateWork(request)
+			}
+		}
+
+		private suspend fun scheduleImpl(data: Collection<Data>) {
+			val constraints = Constraints.Builder()
+				.setRequiresStorageNotLow(true)
+				.setRequiredNetworkType(if (settings.isDownloadsWiFiOnly) NetworkType.UNMETERED else NetworkType.CONNECTED)
+				.build()
+			val requests = data.map { inputData ->
+				OneTimeWorkRequestBuilder<DownloadWorker>()
+					.setConstraints(constraints)
+					.addTag(TAG)
+					.keepResultsForAtLeast(7, TimeUnit.DAYS)
+					.setBackoffCriteria(BackoffPolicy.LINEAR, 10, TimeUnit.SECONDS)
+					.setInputData(inputData)
+					.setExpedited(OutOfQuotaPolicy.RUN_AS_NON_EXPEDITED_WORK_REQUEST)
+					.build()
+			}
+			workManager.enqueue(requests).await()
+		}
+	}
+
+	private companion object {
+
+		const val MAX_FAILSAFE_ATTEMPTS = 2
+		const val DOWNLOAD_ERROR_DELAY = 500L
+		const val SLOWDOWN_DELAY = 100L
+		const val MANGA_ID = "manga_id"
+		const val CHAPTERS_IDS = "chapters"
+		const val TAG = "download"
+	}
+}

app/src/main/java/org/koitharu/kotatsu/download/ui/worker/PausingHandle.kt

@@ -1,4 +1,4 @@
-package org.koitharu.kotatsu.download.ui.service
+package org.koitharu.kotatsu.download.ui.worker
 
 import androidx.annotation.AnyThread
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -27,4 +27,4 @@ class PausingHandle {
 	fun resume() {
 		paused.value = false
 	}
-}
+}

app/src/main/java/org/koitharu/kotatsu/download/ui/worker/PausingReceiver.kt

@@ -0,0 +1,65 @@
+package org.koitharu.kotatsu.download.ui.worker
+
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import android.content.IntentFilter
+import android.net.Uri
+import android.os.PatternMatcher
+import androidx.core.app.PendingIntentCompat
+import org.koitharu.kotatsu.utils.ext.toUUIDOrNull
+import java.util.UUID
+
+class PausingReceiver(
+	private val id: UUID,
+	private val pausingHandle: PausingHandle,
+) : BroadcastReceiver() {
+
+	override fun onReceive(context: Context, intent: Intent?) {
+		val uuid = intent?.getStringExtra(EXTRA_UUID)?.toUUIDOrNull()
+		assert(uuid == id)
+		when (intent?.action) {
+			ACTION_RESUME -> pausingHandle.resume()
+			ACTION_PAUSE -> pausingHandle.pause()
+		}
+	}
+
+	companion object {
+
+		private const val ACTION_PAUSE = "org.koitharu.kotatsu.download.PAUSE"
+		private const val ACTION_RESUME = "org.koitharu.kotatsu.download.RESUME"
+		private const val EXTRA_UUID = "uuid"
+		private const val SCHEME = "workuid"
+
+		fun createIntentFilter(id: UUID) = IntentFilter().apply {
+			addAction(ACTION_PAUSE)
+			addAction(ACTION_RESUME)
+			addDataScheme(SCHEME)
+			addDataPath(id.toString(), PatternMatcher.PATTERN_SIMPLE_GLOB)
+		}
+
+		fun getPauseIntent(id: UUID) = Intent(ACTION_PAUSE)
+			.setData(Uri.parse("$SCHEME://$id"))
+			.putExtra(EXTRA_UUID, id.toString())
+
+		fun getResumeIntent(id: UUID) = Intent(ACTION_RESUME)
+			.setData(Uri.parse("$SCHEME://$id"))
+			.putExtra(EXTRA_UUID, id.toString())
+
+		fun createPausePendingIntent(context: Context, id: UUID) = PendingIntentCompat.getBroadcast(
+			context,
+			0,
+			getPauseIntent(id),
+			0,
+			false,
+		)
+
+		fun createResumePendingIntent(context: Context, id: UUID) = PendingIntentCompat.getBroadcast(
+			context,
+			0,
+			getResumeIntent(id),
+			0,
+			false,
+		)
+	}
+}

app/src/main/java/org/koitharu/kotatsu/favourites/ui/list/FavouritesListViewModel.kt

@@ -13,6 +13,7 @@ import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.base.ui.util.ReversibleAction
 import org.koitharu.kotatsu.core.parser.MangaTagHighlighter
 import org.koitharu.kotatsu.core.prefs.AppSettings
+import org.koitharu.kotatsu.download.ui.worker.DownloadWorker
 import org.koitharu.kotatsu.favourites.domain.FavouritesRepository
 import org.koitharu.kotatsu.favourites.ui.list.FavouritesListFragment.Companion.ARG_CATEGORY_ID
 import org.koitharu.kotatsu.favourites.ui.list.FavouritesListFragment.Companion.NO_ID
@@ -37,7 +38,8 @@ class FavouritesListViewModel @Inject constructor(
 	private val historyRepository: HistoryRepository,
 	private val settings: AppSettings,
 	private val tagHighlighter: MangaTagHighlighter,
-) : MangaListViewModel(settings), ListExtraProvider {
+	downloadScheduler: DownloadWorker.Scheduler,
+) : MangaListViewModel(settings, downloadScheduler), ListExtraProvider {
 
 	val categoryId: Long = savedStateHandle[ARG_CATEGORY_ID] ?: NO_ID
 

app/src/main/java/org/koitharu/kotatsu/history/ui/HistoryListViewModel.kt

@@ -15,6 +15,7 @@ import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.prefs.ListMode
 import org.koitharu.kotatsu.core.prefs.observeAsFlow
 import org.koitharu.kotatsu.core.ui.DateTimeAgo
+import org.koitharu.kotatsu.download.ui.worker.DownloadWorker
 import org.koitharu.kotatsu.history.domain.HistoryRepository
 import org.koitharu.kotatsu.history.domain.MangaWithHistory
 import org.koitharu.kotatsu.history.domain.PROGRESS_NONE
@@ -41,7 +42,8 @@ class HistoryListViewModel @Inject constructor(
 	private val settings: AppSettings,
 	private val trackingRepository: TrackingRepository,
 	private val tagHighlighter: MangaTagHighlighter,
-) : MangaListViewModel(settings) {
+	downloadScheduler: DownloadWorker.Scheduler,
+) : MangaListViewModel(settings, downloadScheduler) {
 
 	val isGroupingEnabled = MutableLiveData<Boolean>()
 

app/src/main/java/org/koitharu/kotatsu/list/ui/MangaListFragment.kt

@@ -34,7 +34,7 @@ import org.koitharu.kotatsu.core.exceptions.resolve.SnackbarErrorObserver
 import org.koitharu.kotatsu.core.prefs.ListMode
 import org.koitharu.kotatsu.databinding.FragmentListBinding
 import org.koitharu.kotatsu.details.ui.DetailsActivity
-import org.koitharu.kotatsu.download.ui.service.DownloadService
+import org.koitharu.kotatsu.download.ui.worker.DownloadStartedObserver
 import org.koitharu.kotatsu.favourites.ui.categories.select.FavouriteCategoriesBottomSheet
 import org.koitharu.kotatsu.list.ui.adapter.MangaListAdapter
 import org.koitharu.kotatsu.list.ui.adapter.MangaListAdapter.Companion.ITEM_TYPE_MANGA_GRID
@@ -125,6 +125,7 @@ abstract class MangaListFragment :
 		viewModel.content.observe(viewLifecycleOwner, ::onListChanged)
 		viewModel.onError.observe(viewLifecycleOwner, SnackbarErrorObserver(binding.recyclerView, this))
 		viewModel.onActionDone.observe(viewLifecycleOwner, ReversibleActionObserver(binding.recyclerView))
+		viewModel.onDownloadStarted.observe(viewLifecycleOwner, DownloadStartedObserver(binding.recyclerView))
 	}
 
 	override fun onDestroyView() {
@@ -299,7 +300,7 @@ abstract class MangaListFragment :
 			}
 
 			R.id.action_save -> {
-				DownloadService.confirmAndStart(binding.recyclerView, selectedItems)
+				viewModel.download(selectedItems)
 				mode.finish()
 				true
 			}

app/src/main/java/org/koitharu/kotatsu/list/ui/MangaListViewModel.kt

@@ -11,13 +11,16 @@ import org.koitharu.kotatsu.base.ui.util.ReversibleAction
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.prefs.observeAsFlow
 import org.koitharu.kotatsu.core.prefs.observeAsLiveData
+import org.koitharu.kotatsu.download.ui.worker.DownloadWorker
 import org.koitharu.kotatsu.list.ui.model.ListModel
+import org.koitharu.kotatsu.parsers.model.Manga
 import org.koitharu.kotatsu.parsers.model.MangaTag
 import org.koitharu.kotatsu.utils.SingleLiveEvent
 import org.koitharu.kotatsu.utils.asFlowLiveData
 
 abstract class MangaListViewModel(
 	private val settings: AppSettings,
+	private val downloadScheduler: DownloadWorker.Scheduler,
 ) : BaseViewModel() {
 
 	abstract val content: LiveData<List<ListModel>>
@@ -30,10 +33,18 @@ abstract class MangaListViewModel(
 		key = AppSettings.KEY_GRID_SIZE,
 		valueProducer = { gridSize / 100f },
 	)
+	val onDownloadStarted = SingleLiveEvent<Unit>()
 
 	open fun onUpdateFilter(tags: Set<MangaTag>) = Unit
 
 	abstract fun onRefresh()
 
 	abstract fun onRetry()
+
+	fun download(items: Set<Manga>) {
+		launchJob(Dispatchers.Default) {
+			downloadScheduler.schedule(items)
+			onDownloadStarted.emitCall(Unit)
+		}
+	}
 }

app/src/main/java/org/koitharu/kotatsu/local/data/PagesCache.kt

@@ -6,17 +6,19 @@ import dagger.hilt.android.qualifiers.ApplicationContext
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.runInterruptible
 import kotlinx.coroutines.withContext
+import okio.Source
+import okio.buffer
+import okio.sink
 import org.koitharu.kotatsu.parsers.util.SuspendLazy
 import org.koitharu.kotatsu.utils.FileSize
-import org.koitharu.kotatsu.utils.ext.copyToSuspending
 import org.koitharu.kotatsu.utils.ext.longHashCode
 import org.koitharu.kotatsu.utils.ext.printStackTraceDebug
 import org.koitharu.kotatsu.utils.ext.runCatchingCancellable
 import org.koitharu.kotatsu.utils.ext.subdir
 import org.koitharu.kotatsu.utils.ext.takeIfReadable
 import org.koitharu.kotatsu.utils.ext.takeIfWriteable
+import org.koitharu.kotatsu.utils.ext.writeAllCancellable
 import java.io.File
-import java.io.InputStream
 import javax.inject.Inject
 import javax.inject.Singleton
 
@@ -49,11 +51,11 @@ class PagesCache @Inject constructor(@ApplicationContext context: Context) {
 		}
 	}
 
-	suspend fun put(url: String, inputStream: InputStream): File = withContext(Dispatchers.IO) {
+	suspend fun put(url: String, source: Source): File = withContext(Dispatchers.IO) {
 		val file = File(cacheDir.get().parentFile, url.longHashCode().toString())
 		try {
-			file.outputStream().use { out ->
-				inputStream.copyToSuspending(out)
+			file.sink(append = false).buffer().use {
+				it.writeAllCancellable(source)
 			}
 			lruCache.get().put(url, file)
 		} finally {

app/src/main/java/org/koitharu/kotatsu/local/data/importer/SingleMangaImporter.kt

@@ -7,16 +7,19 @@ import dagger.Reusable
 import dagger.hilt.android.qualifiers.ApplicationContext
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.MutableSharedFlow
-import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.runInterruptible
+import kotlinx.coroutines.withContext
+import okio.buffer
+import okio.sink
+import okio.source
 import org.koitharu.kotatsu.core.exceptions.UnsupportedFileException
 import org.koitharu.kotatsu.local.data.CbzFilter
 import org.koitharu.kotatsu.local.data.LocalManga
 import org.koitharu.kotatsu.local.data.LocalStorageChanges
 import org.koitharu.kotatsu.local.data.LocalStorageManager
 import org.koitharu.kotatsu.local.data.input.LocalMangaInput
-import org.koitharu.kotatsu.utils.ext.copyToSuspending
 import org.koitharu.kotatsu.utils.ext.resolveName
+import org.koitharu.kotatsu.utils.ext.writeAllCancellable
 import java.io.File
 import java.io.IOException
 import javax.inject.Inject
@@ -30,17 +33,17 @@ class SingleMangaImporter @Inject constructor(
 
 	private val contentResolver = context.contentResolver
 
-	suspend fun import(uri: Uri, progressState: MutableStateFlow<Float>?): LocalManga {
+	suspend fun import(uri: Uri): LocalManga {
 		val result = if (isDirectory(uri)) {
-			importDirectory(uri, progressState)
+			importDirectory(uri)
 		} else {
-			importFile(uri, progressState)
+			importFile(uri)
 		}
 		localStorageChanges.emit(result)
 		return result
 	}
 
-	private suspend fun importFile(uri: Uri, progressState: MutableStateFlow<Float>?): LocalManga {
+	private suspend fun importFile(uri: Uri): LocalManga = withContext(Dispatchers.IO) {
 		val contentResolver = storageManager.contentResolver
 		val name = contentResolver.resolveName(uri) ?: throw IOException("Cannot fetch name from uri: $uri")
 		if (!CbzFilter.isFileSupported(name)) {
@@ -50,14 +53,14 @@ class SingleMangaImporter @Inject constructor(
 		runInterruptible {
 			contentResolver.openInputStream(uri)
 		}?.use { source ->
-			dest.outputStream().use { output ->
-				source.copyToSuspending(output, progressState = progressState)
+			dest.sink().buffer().use { output ->
+				output.writeAllCancellable(source.source())
 			}
 		} ?: throw IOException("Cannot open input stream: $uri")
-		return LocalMangaInput.of(dest).getManga()
+		LocalMangaInput.of(dest).getManga()
 	}
 
-	private suspend fun importDirectory(uri: Uri, progressState: MutableStateFlow<Float>?): LocalManga {
+	private suspend fun importDirectory(uri: Uri): LocalManga {
 		val root = requireNotNull(DocumentFile.fromTreeUri(context, uri)) {
 			"Provided uri $uri is not a tree"
 		}
@@ -80,9 +83,9 @@ class SingleMangaImporter @Inject constructor(
 				docFile.copyTo(subDir)
 			}
 		} else {
-			inputStream().use { input ->
-				File(destDir, requireName()).outputStream().use { output ->
-					input.copyToSuspending(output)
+			inputStream().source().use { input ->
+				File(destDir, requireName()).sink().buffer().use { output ->
+					output.writeAllCancellable(input)
 				}
 			}
 		}

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

@@ -48,7 +48,7 @@ class ImportWorker @AssistedInject constructor(
 		val uri = inputData.getString(DATA_URI)?.toUriOrNull() ?: return Result.failure()
 		setForeground(getForegroundInfo())
 		val result = runCatchingCancellable {
-			importer.import(uri, null).manga
+			importer.import(uri).manga
 		}
 		val notification = buildNotification(result)
 		notificationManager.notify(uri.hashCode(), notification)

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

@@ -17,6 +17,7 @@ import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.base.ui.widgets.ChipsView
 import org.koitharu.kotatsu.core.parser.MangaTagHighlighter
 import org.koitharu.kotatsu.core.prefs.AppSettings
+import org.koitharu.kotatsu.download.ui.worker.DownloadWorker
 import org.koitharu.kotatsu.history.domain.HistoryRepository
 import org.koitharu.kotatsu.history.domain.PROGRESS_NONE
 import org.koitharu.kotatsu.list.domain.ListExtraProvider
@@ -48,7 +49,8 @@ class LocalListViewModel @Inject constructor(
 	private val settings: AppSettings,
 	private val tagHighlighter: MangaTagHighlighter,
 	@LocalStorageChanges private val localStorageChanges: SharedFlow<LocalManga?>,
-) : MangaListViewModel(settings), ListExtraProvider {
+	downloadScheduler: DownloadWorker.Scheduler,
+) : MangaListViewModel(settings, downloadScheduler), ListExtraProvider {
 
 	val onMangaRemoved = SingleLiveEvent<Unit>()
 	val sortOrder = MutableLiveData(settings.localListOrder)

app/src/main/java/org/koitharu/kotatsu/reader/domain/PageLoader.kt

@@ -20,6 +20,7 @@ import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.withLock
 import okhttp3.OkHttpClient
 import okhttp3.Request
+import okio.source
 import org.koitharu.kotatsu.core.network.CommonHeaders
 import org.koitharu.kotatsu.core.parser.MangaRepository
 import org.koitharu.kotatsu.core.parser.RemoteMangaRepository
@@ -186,7 +187,7 @@ class PageLoader @Inject constructor(
 					val entry = zip.getEntry(uri.fragment)
 					zip.getInputStream(entry)
 				}.use {
-					cache.put(pageUrl, it)
+					cache.put(pageUrl, it.source())
 				}
 			}
 		} else {
@@ -204,8 +205,8 @@ class PageLoader @Inject constructor(
 				val body = checkNotNull(response.body) {
 					"Null response"
 				}
-				body.withProgress(progress).byteStream().use {
-					cache.put(pageUrl, it)
+				body.withProgress(progress).use {
+					cache.put(pageUrl, it.source())
 				}
 			}
 		}

app/src/main/java/org/koitharu/kotatsu/reader/ui/PageSaveHelper.kt

@@ -12,11 +12,14 @@ import kotlinx.coroutines.suspendCancellableCoroutine
 import kotlinx.coroutines.withContext
 import okhttp3.HttpUrl.Companion.toHttpUrl
 import okio.IOException
+import okio.buffer
+import okio.sink
+import okio.source
 import org.koitharu.kotatsu.base.domain.MangaDataRepository
 import org.koitharu.kotatsu.parsers.model.MangaPage
 import org.koitharu.kotatsu.parsers.util.toFileNameSafe
 import org.koitharu.kotatsu.reader.domain.PageLoader
-import org.koitharu.kotatsu.utils.ext.copyToSuspending
+import org.koitharu.kotatsu.utils.ext.writeAllCancellable
 import java.io.File
 import javax.inject.Inject
 import kotlin.coroutines.Continuation
@@ -49,10 +52,10 @@ class PageSaveHelper @Inject constructor(
 			}
 		}
 		runInterruptible(Dispatchers.IO) {
-			contentResolver.openOutputStream(destination)
+			contentResolver.openOutputStream(destination)?.sink()?.buffer()
 		}?.use { output ->
-			pageFile.inputStream().use { input ->
-				input.copyToSuspending(output)
+			pageFile.source().use { input ->
+				output.writeAllCancellable(input)
 			}
 		} ?: throw IOException("Output stream is null")
 		return destination

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

@@ -21,6 +21,7 @@ import org.koitharu.kotatsu.core.parser.MangaRepository
 import org.koitharu.kotatsu.core.parser.MangaTagHighlighter
 import org.koitharu.kotatsu.core.parser.RemoteMangaRepository
 import org.koitharu.kotatsu.core.prefs.AppSettings
+import org.koitharu.kotatsu.download.ui.worker.DownloadWorker
 import org.koitharu.kotatsu.list.ui.MangaListViewModel
 import org.koitharu.kotatsu.list.ui.filter.FilterCoordinator
 import org.koitharu.kotatsu.list.ui.filter.FilterItem
@@ -53,7 +54,8 @@ class RemoteListViewModel @Inject constructor(
 	settings: AppSettings,
 	dataRepository: MangaDataRepository,
 	private val tagHighlighter: MangaTagHighlighter,
-) : MangaListViewModel(settings), OnFilterChangedListener {
+	downloadScheduler: DownloadWorker.Scheduler,
+) : MangaListViewModel(settings, downloadScheduler), OnFilterChangedListener {
 
 	val source = savedStateHandle.require<MangaSource>(RemoteListFragment.ARG_SOURCE)
 	private val repository = mangaRepositoryFactory.create(source) as RemoteMangaRepository

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

@@ -12,6 +12,7 @@ import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.parser.MangaRepository
 import org.koitharu.kotatsu.core.parser.MangaTagHighlighter
 import org.koitharu.kotatsu.core.prefs.AppSettings
+import org.koitharu.kotatsu.download.ui.worker.DownloadWorker
 import org.koitharu.kotatsu.list.ui.MangaListViewModel
 import org.koitharu.kotatsu.list.ui.model.EmptyState
 import org.koitharu.kotatsu.list.ui.model.ListModel
@@ -31,7 +32,8 @@ class SearchViewModel @Inject constructor(
 	repositoryFactory: MangaRepository.Factory,
 	settings: AppSettings,
 	private val tagHighlighter: MangaTagHighlighter,
-) : MangaListViewModel(settings) {
+	downloadScheduler: DownloadWorker.Scheduler,
+) : MangaListViewModel(settings, downloadScheduler) {
 
 	private val query = savedStateHandle.require<String>(SearchFragment.ARG_QUERY)
 	private val repository = repositoryFactory.create(savedStateHandle.require(SearchFragment.ARG_SOURCE))

app/src/main/java/org/koitharu/kotatsu/search/ui/multi/MultiSearchActivity.kt

@@ -17,10 +17,11 @@ import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.base.ui.BaseActivity
 import org.koitharu.kotatsu.base.ui.list.ListSelectionController
 import org.koitharu.kotatsu.base.ui.list.OnListItemClickListener
+import org.koitharu.kotatsu.core.exceptions.resolve.SnackbarErrorObserver
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.databinding.ActivitySearchMultiBinding
 import org.koitharu.kotatsu.details.ui.DetailsActivity
-import org.koitharu.kotatsu.download.ui.service.DownloadService
+import org.koitharu.kotatsu.download.ui.worker.DownloadStartedObserver
 import org.koitharu.kotatsu.favourites.ui.categories.select.FavouriteCategoriesBottomSheet
 import org.koitharu.kotatsu.list.ui.ItemSizeResolver
 import org.koitharu.kotatsu.list.ui.MangaSelectionDecoration
@@ -89,6 +90,8 @@ class MultiSearchActivity :
 
 		viewModel.query.observe(this) { title = it }
 		viewModel.list.observe(this) { adapter.items = it }
+		viewModel.onError.observe(this, SnackbarErrorObserver(binding.recyclerView, null))
+		viewModel.onDownloadStarted.observe(this, DownloadStartedObserver(binding.recyclerView))
 	}
 
 	override fun onWindowInsetsChanged(insets: Insets) {
@@ -162,7 +165,7 @@ class MultiSearchActivity :
 			}
 
 			R.id.action_save -> {
-				DownloadService.confirmAndStart(binding.recyclerView, collectSelectedItems())
+				viewModel.download(collectSelectedItems())
 				mode.finish()
 				true
 			}

app/src/main/java/org/koitharu/kotatsu/search/ui/multi/MultiSearchViewModel.kt

@@ -20,6 +20,7 @@ import org.koitharu.kotatsu.core.exceptions.CompositeException
 import org.koitharu.kotatsu.core.parser.MangaRepository
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.prefs.ListMode
+import org.koitharu.kotatsu.download.ui.worker.DownloadWorker
 import org.koitharu.kotatsu.list.ui.model.EmptyState
 import org.koitharu.kotatsu.list.ui.model.ListModel
 import org.koitharu.kotatsu.list.ui.model.LoadingFooter
@@ -27,6 +28,7 @@ import org.koitharu.kotatsu.list.ui.model.LoadingState
 import org.koitharu.kotatsu.list.ui.model.toErrorState
 import org.koitharu.kotatsu.list.ui.model.toUi
 import org.koitharu.kotatsu.parsers.model.Manga
+import org.koitharu.kotatsu.utils.SingleLiveEvent
 import org.koitharu.kotatsu.utils.asFlowLiveData
 import org.koitharu.kotatsu.utils.ext.emitValue
 import org.koitharu.kotatsu.utils.ext.printStackTraceDebug
@@ -41,12 +43,14 @@ class MultiSearchViewModel @Inject constructor(
 	savedStateHandle: SavedStateHandle,
 	private val settings: AppSettings,
 	private val mangaRepositoryFactory: MangaRepository.Factory,
+	private val downloadScheduler: DownloadWorker.Scheduler,
 ) : BaseViewModel() {
 
 	private var searchJob: Job? = null
 	private val listData = MutableStateFlow<List<MultiSearchListModel>>(emptyList())
 	private val loadingData = MutableStateFlow(false)
 	private var listError = MutableStateFlow<Throwable?>(null)
+	val onDownloadStarted = SingleLiveEvent<Unit>()
 
 	val query = MutableLiveData(savedStateHandle.get<String>(MultiSearchActivity.EXTRA_QUERY).orEmpty())
 	val list: LiveData<List<ListModel>> = combine(
@@ -109,6 +113,13 @@ class MultiSearchViewModel @Inject constructor(
 		}
 	}
 
+	fun download(items: Set<Manga>) {
+		launchJob(Dispatchers.Default) {
+			downloadScheduler.schedule(items)
+			onDownloadStarted.emitCall(Unit)
+		}
+	}
+
 	private suspend fun searchImpl(q: String) = coroutineScope {
 		val sources = settings.getMangaSources(includeHidden = false)
 		val dispatcher = Dispatchers.Default.limitedParallelism(MAX_PARALLELISM)

app/src/main/java/org/koitharu/kotatsu/settings/ContentSettingsFragment.kt

@@ -7,17 +7,20 @@ import androidx.preference.ListPreference
 import androidx.preference.Preference
 import com.google.android.material.snackbar.Snackbar
 import dagger.hilt.android.AndroidEntryPoint
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.base.ui.BasePreferenceFragment
 import org.koitharu.kotatsu.base.ui.dialog.StorageSelectDialog
 import org.koitharu.kotatsu.core.cache.ContentCache
 import org.koitharu.kotatsu.core.network.DoHProvider
 import org.koitharu.kotatsu.core.prefs.AppSettings
+import org.koitharu.kotatsu.download.ui.worker.DownloadWorker
 import org.koitharu.kotatsu.local.data.LocalStorageManager
 import org.koitharu.kotatsu.parsers.util.names
-import org.koitharu.kotatsu.settings.utils.SliderPreference
 import org.koitharu.kotatsu.utils.ext.getStorageName
+import org.koitharu.kotatsu.utils.ext.printStackTraceDebug
 import org.koitharu.kotatsu.utils.ext.setDefaultValueCompat
 import org.koitharu.kotatsu.utils.ext.viewLifecycleScope
 import java.io.File
@@ -35,16 +38,12 @@ class ContentSettingsFragment :
 	@Inject
 	lateinit var contentCache: ContentCache
 
+	@Inject
+	lateinit var downloadsScheduler: DownloadWorker.Scheduler
+
 	override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
 		addPreferencesFromResource(R.xml.pref_content)
 		findPreference<Preference>(AppSettings.KEY_PREFETCH_CONTENT)?.isVisible = contentCache.isCachingEnabled
-		findPreference<SliderPreference>(AppSettings.KEY_DOWNLOADS_PARALLELISM)?.run {
-			summary = value.toString()
-			setOnPreferenceChangeListener { preference, newValue ->
-				preference.summary = newValue.toString()
-				true
-			}
-		}
 		findPreference<ListPreference>(AppSettings.KEY_DOH)?.run {
 			entryValues = arrayOf(
 				DoHProvider.NONE,
@@ -87,6 +86,10 @@ class ContentSettingsFragment :
 				bindRemoteSourcesSummary()
 			}
 
+			AppSettings.KEY_DOWNLOADS_WIFI -> {
+				updateDownloadsConstraints()
+			}
+
 			AppSettings.KEY_SSL_BYPASS -> {
 				Snackbar.make(listView, R.string.settings_apply_restart_required, Snackbar.LENGTH_INDEFINITE).show()
 			}
@@ -126,4 +129,20 @@ class ContentSettingsFragment :
 			summary = getString(R.string.enabled_d_of_d, total - settings.hiddenSources.size, total)
 		}
 	}
+
+	private fun updateDownloadsConstraints() {
+		val preference = findPreference<Preference>(AppSettings.KEY_DOWNLOADS_WIFI)
+		viewLifecycleScope.launch {
+			try {
+				preference?.isEnabled = false
+				withContext(Dispatchers.Default) {
+					downloadsScheduler.updateConstraints()
+				}
+			} catch (e: Exception) {
+				e.printStackTraceDebug()
+			} finally {
+				preference?.isEnabled = true
+			}
+		}
+	}
 }

app/src/main/java/org/koitharu/kotatsu/settings/tools/ToolsFragment.kt

@@ -16,7 +16,7 @@ import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.base.ui.BaseFragment
 import org.koitharu.kotatsu.core.github.AppVersion
 import org.koitharu.kotatsu.databinding.FragmentToolsBinding
-import org.koitharu.kotatsu.download.ui.DownloadsActivity
+import org.koitharu.kotatsu.download.ui.list.DownloadsActivity
 import org.koitharu.kotatsu.settings.SettingsActivity
 import org.koitharu.kotatsu.settings.about.AppUpdateDialog
 

app/src/main/java/org/koitharu/kotatsu/shelf/ui/ShelfFragment.kt

@@ -22,6 +22,7 @@ import org.koitharu.kotatsu.core.exceptions.resolve.SnackbarErrorObserver
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.databinding.FragmentShelfBinding
 import org.koitharu.kotatsu.details.ui.DetailsActivity
+import org.koitharu.kotatsu.download.ui.worker.DownloadStartedObserver
 import org.koitharu.kotatsu.favourites.ui.FavouritesActivity
 import org.koitharu.kotatsu.history.ui.HistoryActivity
 import org.koitharu.kotatsu.list.ui.ItemSizeResolver
@@ -84,6 +85,7 @@ class ShelfFragment :
 		viewModel.content.observe(viewLifecycleOwner, ::onListChanged)
 		viewModel.onError.observe(viewLifecycleOwner, SnackbarErrorObserver(binding.recyclerView, this))
 		viewModel.onActionDone.observe(viewLifecycleOwner, ReversibleActionObserver(binding.recyclerView))
+		viewModel.onDownloadStarted.observe(viewLifecycleOwner, DownloadStartedObserver(binding.recyclerView))
 	}
 
 	override fun onSaveInstanceState(outState: Bundle) {

app/src/main/java/org/koitharu/kotatsu/shelf/ui/ShelfSelectionCallback.kt

@@ -10,7 +10,6 @@ import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.base.ui.list.SectionedSelectionController
 import org.koitharu.kotatsu.base.ui.list.decor.AbstractSelectionItemDecoration
-import org.koitharu.kotatsu.download.ui.service.DownloadService
 import org.koitharu.kotatsu.favourites.ui.categories.select.FavouriteCategoriesBottomSheet
 import org.koitharu.kotatsu.list.ui.MangaSelectionDecoration
 import org.koitharu.kotatsu.parsers.model.Manga
@@ -68,7 +67,7 @@ class ShelfSelectionCallback(
 			}
 
 			R.id.action_save -> {
-				DownloadService.confirmAndStart(recyclerView, collectSelectedItems(controller))
+				viewModel.download(collectSelectedItems(controller))
 				mode.finish()
 				true
 			}

app/src/main/java/org/koitharu/kotatsu/shelf/ui/ShelfViewModel.kt

@@ -15,6 +15,7 @@ import org.koitharu.kotatsu.core.os.NetworkState
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.prefs.ListMode
 import org.koitharu.kotatsu.core.prefs.observeAsFlow
+import org.koitharu.kotatsu.download.ui.worker.DownloadWorker
 import org.koitharu.kotatsu.favourites.domain.FavouritesRepository
 import org.koitharu.kotatsu.history.domain.HistoryRepository
 import org.koitharu.kotatsu.history.domain.MangaWithHistory
@@ -46,11 +47,13 @@ class ShelfViewModel @Inject constructor(
 	private val favouritesRepository: FavouritesRepository,
 	private val trackingRepository: TrackingRepository,
 	private val settings: AppSettings,
+	private val downloadScheduler: DownloadWorker.Scheduler,
 	syncController: SyncController,
 	networkState: NetworkState,
 ) : BaseViewModel(), ListExtraProvider {
 
 	val onActionDone = SingleLiveEvent<ReversibleAction>()
+	val onDownloadStarted = SingleLiveEvent<Unit>()
 
 	val content: LiveData<List<ListModel>> = combine(
 		settings.observeAsFlow(AppSettings.KEY_SHELF_SECTIONS) { shelfSections },
@@ -144,6 +147,13 @@ class ShelfViewModel @Inject constructor(
 		return result
 	}
 
+	fun download(items: Set<Manga>) {
+		launchJob(Dispatchers.Default) {
+			downloadScheduler.schedule(items)
+			onDownloadStarted.emitCall(Unit)
+		}
+	}
+
 	private suspend fun mapList(
 		content: ShelfContent,
 		isTrackerEnabled: Boolean,

app/src/main/java/org/koitharu/kotatsu/suggestions/ui/SuggestionsViewModel.kt

@@ -9,6 +9,7 @@ import kotlinx.coroutines.flow.onStart
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.parser.MangaTagHighlighter
 import org.koitharu.kotatsu.core.prefs.AppSettings
+import org.koitharu.kotatsu.download.ui.worker.DownloadWorker
 import org.koitharu.kotatsu.list.ui.MangaListViewModel
 import org.koitharu.kotatsu.list.ui.model.EmptyState
 import org.koitharu.kotatsu.list.ui.model.LoadingState
@@ -24,7 +25,8 @@ class SuggestionsViewModel @Inject constructor(
 	repository: SuggestionRepository,
 	settings: AppSettings,
 	private val tagHighlighter: MangaTagHighlighter,
-) : MangaListViewModel(settings) {
+	downloadScheduler: DownloadWorker.Scheduler,
+) : MangaListViewModel(settings, downloadScheduler) {
 
 	override val content = combine(
 		repository.observeAll(),

app/src/main/java/org/koitharu/kotatsu/sync/domain/SyncHelper.kt

@@ -22,12 +22,12 @@ import org.koitharu.kotatsu.core.db.TABLE_HISTORY
 import org.koitharu.kotatsu.core.db.TABLE_MANGA
 import org.koitharu.kotatsu.core.db.TABLE_MANGA_TAGS
 import org.koitharu.kotatsu.core.db.TABLE_TAGS
+import org.koitharu.kotatsu.core.network.GZipInterceptor
 import org.koitharu.kotatsu.parsers.util.json.mapJSONTo
 import org.koitharu.kotatsu.sync.data.SyncAuthApi
 import org.koitharu.kotatsu.sync.data.SyncAuthenticator
 import org.koitharu.kotatsu.sync.data.SyncInterceptor
 import org.koitharu.kotatsu.sync.data.SyncSettings
-import org.koitharu.kotatsu.utils.GZipInterceptor
 import org.koitharu.kotatsu.utils.ext.parseJsonOrNull
 import org.koitharu.kotatsu.utils.ext.toContentValues
 import org.koitharu.kotatsu.utils.ext.toJson

app/src/main/java/org/koitharu/kotatsu/tracker/ui/updates/UpdatesViewModel.kt

@@ -10,6 +10,7 @@ import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.parser.MangaTagHighlighter
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.prefs.ListMode
+import org.koitharu.kotatsu.download.ui.worker.DownloadWorker
 import org.koitharu.kotatsu.history.domain.HistoryRepository
 import org.koitharu.kotatsu.history.domain.PROGRESS_NONE
 import org.koitharu.kotatsu.list.ui.MangaListViewModel
@@ -32,7 +33,8 @@ class UpdatesViewModel @Inject constructor(
 	private val settings: AppSettings,
 	private val historyRepository: HistoryRepository,
 	private val tagHighlighter: MangaTagHighlighter,
-) : MangaListViewModel(settings) {
+	downloadScheduler: DownloadWorker.Scheduler,
+) : MangaListViewModel(settings, downloadScheduler) {
 
 	override val content = combine(
 		repository.observeUpdatedManga(),

app/src/main/java/org/koitharu/kotatsu/utils/CancellableSource.kt

@@ -0,0 +1,18 @@
+package org.koitharu.kotatsu.utils
+
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.ensureActive
+import okio.Buffer
+import okio.ForwardingSource
+import okio.Source
+
+class CancellableSource(
+	private val job: Job?,
+	delegate: Source,
+) : ForwardingSource(delegate) {
+
+	override fun read(sink: Buffer, byteCount: Long): Long {
+		job?.ensureActive()
+		return super.read(sink, byteCount)
+	}
+}

app/src/main/java/org/koitharu/kotatsu/utils/GZipInterceptor.kt

@@ -1,14 +0,0 @@
-package org.koitharu.kotatsu.utils
-
-import okhttp3.Interceptor
-import okhttp3.Response
-import org.koitharu.kotatsu.core.network.CommonHeaders.CONTENT_ENCODING
-
-class GZipInterceptor : Interceptor {
-
-	override fun intercept(chain: Interceptor.Chain): Response {
-		val newRequest = chain.request().newBuilder()
-		newRequest.addHeader(CONTENT_ENCODING, "gzip")
-		return chain.proceed(newRequest.build())
-	}
-}

app/src/main/java/org/koitharu/kotatsu/utils/Throttler.kt

@@ -0,0 +1,24 @@
+package org.koitharu.kotatsu.utils
+
+import android.os.SystemClock
+
+class Throttler(
+	private val timeoutMs: Long,
+) {
+
+	private var lastTick = 0L
+
+	fun throttle(): Boolean {
+		val now = SystemClock.elapsedRealtime()
+		return if (lastTick + timeoutMs <= now) {
+			lastTick = now
+			true
+		} else {
+			false
+		}
+	}
+
+	fun reset() {
+		lastTick = 0L
+	}
+}

app/src/main/java/org/koitharu/kotatsu/utils/WorkManagerHelper.kt

@@ -0,0 +1,67 @@
+package org.koitharu.kotatsu.utils
+
+import android.annotation.SuppressLint
+import androidx.work.WorkInfo
+import androidx.work.WorkManager
+import androidx.work.WorkQuery
+import androidx.work.WorkRequest
+import androidx.work.await
+import androidx.work.impl.WorkManagerImpl
+import java.util.UUID
+import kotlin.coroutines.resume
+import kotlin.coroutines.resumeWithException
+import kotlin.coroutines.suspendCoroutine
+
+@SuppressLint("RestrictedApi")
+class WorkManagerHelper(
+	workManager: WorkManager,
+) {
+
+	private val workManagerImpl = workManager as WorkManagerImpl
+
+	suspend fun deleteWork(id: UUID) = suspendCoroutine { cont ->
+		workManagerImpl.workTaskExecutor.executeOnTaskThread {
+			try {
+				workManagerImpl.workDatabase.workSpecDao().delete(id.toString())
+				cont.resume(Unit)
+			} catch (e: Exception) {
+				cont.resumeWithException(e)
+			}
+		}
+	}
+
+	suspend fun deleteWorks(ids: Collection<UUID>) = suspendCoroutine { cont ->
+		workManagerImpl.workTaskExecutor.executeOnTaskThread {
+			try {
+				val db = workManagerImpl.workDatabase
+				db.runInTransaction {
+					for (id in ids) {
+						db.workSpecDao().delete(id.toString())
+					}
+				}
+				cont.resume(Unit)
+			} catch (e: Exception) {
+				cont.resumeWithException(e)
+			}
+		}
+	}
+
+	suspend fun getWorkInfosByTag(tag: String): List<WorkInfo> {
+		return workManagerImpl.getWorkInfosByTag(tag).await()
+	}
+
+	suspend fun getFinishedWorkInfosByTag(tag: String): List<WorkInfo> {
+		val query = WorkQuery.Builder.fromTags(listOf(tag))
+			.addStates(listOf(WorkInfo.State.SUCCEEDED, WorkInfo.State.CANCELLED, WorkInfo.State.FAILED))
+			.build()
+		return workManagerImpl.getWorkInfos(query).await()
+	}
+
+	suspend fun getWorkInfoById(id: UUID): WorkInfo? {
+		return workManagerImpl.getWorkInfoById(id).await()
+	}
+
+	suspend fun updateWork(request: WorkRequest): WorkManager.UpdateResult {
+		return workManagerImpl.updateWork(request).await()
+	}
+}

app/src/main/java/org/koitharu/kotatsu/utils/ext/CoilExt.kt

@@ -37,11 +37,20 @@ fun ImageView.disposeImageRequest() {
 
 fun ImageRequest.Builder.enqueueWith(loader: ImageLoader) = loader.enqueue(build())
 
-fun ImageResult.requireBitmap() = when (this) {
-	is SuccessResult -> drawable.toBitmap()
+fun ImageResult.getDrawableOrThrow() = when (this) {
+	is SuccessResult -> drawable
 	is ErrorResult -> throw throwable
 }
 
+@Deprecated(
+	"",
+	ReplaceWith(
+		"getDrawableOrThrow().toBitmap()",
+		"androidx.core.graphics.drawable.toBitmap",
+	),
+)
+fun ImageResult.requireBitmap() = getDrawableOrThrow().toBitmap()
+
 fun ImageResult.toBitmapOrNull() = when (this) {
 	is SuccessResult -> try {
 		drawable.toBitmap()

app/src/main/java/org/koitharu/kotatsu/utils/ext/IO.kt

@@ -3,37 +3,23 @@ package org.koitharu.kotatsu.utils.ext
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.currentCoroutineContext
-import kotlinx.coroutines.ensureActive
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.withContext
 import okhttp3.ResponseBody
+import okio.BufferedSink
+import okio.Source
+import org.koitharu.kotatsu.utils.CancellableSource
 import org.koitharu.kotatsu.utils.progress.ProgressResponseBody
-import java.io.InputStream
-import java.io.OutputStream
-
-suspend fun InputStream.copyToSuspending(
-	out: OutputStream,
-	bufferSize: Int = DEFAULT_BUFFER_SIZE,
-	progressState: MutableStateFlow<Float>? = null,
-): Long = withContext(Dispatchers.IO) {
-	val job = currentCoroutineContext()[Job]
-	val total = available()
-	var bytesCopied: Long = 0
-	val buffer = ByteArray(bufferSize)
-	var bytes = read(buffer)
-	while (bytes >= 0) {
-		out.write(buffer, 0, bytes)
-		bytesCopied += bytes
-		job?.ensureActive()
-		bytes = read(buffer)
-		job?.ensureActive()
-		if (progressState != null && total > 0) {
-			progressState.value = bytesCopied / total.toFloat()
-		}
-	}
-	bytesCopied
-}
 
 fun ResponseBody.withProgress(progressState: MutableStateFlow<Float>): ResponseBody {
 	return ProgressResponseBody(this, progressState)
 }
+
+suspend fun Source.cancellable(): Source {
+	val job = currentCoroutineContext()[Job]
+	return CancellableSource(job, this)
+}
+
+suspend fun BufferedSink.writeAllCancellable(source: Source) = withContext(Dispatchers.IO) {
+	writeAll(source.cancellable())
+}

app/src/main/java/org/koitharu/kotatsu/utils/ext/StringExt.kt

@@ -1,5 +1,7 @@
 package org.koitharu.kotatsu.utils.ext
 
+import java.util.UUID
+
 inline fun String?.ifNullOrEmpty(defaultValue: () -> String): String {
 	return if (this.isNullOrEmpty()) defaultValue() else this
 }
@@ -11,4 +13,11 @@ fun String.longHashCode(): Long {
 		h = 31 * h + this[i].code
 	}
 	return h
-}
+}
+
+fun String.toUUIDOrNull(): UUID? = try {
+	UUID.fromString(this)
+} catch (e: IllegalArgumentException) {
+	e.printStackTraceDebug()
+	null
+}

app/src/main/java/org/koitharu/kotatsu/utils/progress/PausingProgressJob.kt

@@ -3,7 +3,7 @@ package org.koitharu.kotatsu.utils.progress
 import androidx.annotation.AnyThread
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.flow.StateFlow
-import org.koitharu.kotatsu.download.ui.service.PausingHandle
+import org.koitharu.kotatsu.download.ui.worker.PausingHandle
 
 class PausingProgressJob<P>(
 	job: Job,
@@ -23,4 +23,4 @@ class PausingProgressJob<P>(
 
 	@AnyThread
 	fun resume() = pausingHandle.resume()
-}
+}

app/src/main/java/org/koitharu/kotatsu/utils/progress/TimeLeftEstimator.kt

@@ -42,9 +42,14 @@ class TimeLeftEstimator {
 		return if (eta < tooLargeTime) eta else NO_TIME
 	}
 
+	fun getEta(): Long {
+		val etl = getEstimatedTimeLeft()
+		return if (etl == NO_TIME) NO_TIME else System.currentTimeMillis() + etl
+	}
+
 	private class Tick(
-		val value: Int,
-		val total: Int,
-		val time: Long,
+		@JvmField val value: Int,
+		@JvmField val total: Int,
+		@JvmField val time: Long,
 	)
-}
+}

app/src/main/res/drawable-anydpi-v24/ic_stat_paused.xml

@@ -0,0 +1,15 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="#FFFFFF">
+  <group android:scaleX="1.3320464"
+      android:scaleY="1.3320464"
+      android:translateX="-3.984556"
+      android:translateY="-3.984556">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M6,19h4L10,5L6,5v14zM14,5v14h4L18,5h-4z"/>
+  </group>
+</vector>

app/src/main/res/drawable/ic_action_pause.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	android:width="24dp"
+	android:height="24dp"
+	android:viewportWidth="24"
+	android:viewportHeight="24">
+	<path
+		android:fillColor="#000000"
+		android:pathData="M14,19H18V5H14M6,19H10V5H6V19Z" />
+</vector>

app/src/main/res/drawable/ic_action_resume.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	android:width="24dp"
+	android:height="24dp"
+	android:viewportWidth="24"
+	android:viewportHeight="24">
+	<path
+		android:fillColor="#000000"
+		android:pathData="M8,5.14V19.14L19,12.14L8,5.14Z" />
+</vector>

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

@@ -41,15 +41,4 @@
 		app:layout_behavior="com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior"
 		tools:listitem="@layout/item_download" />
 
-	<TextView
-		android:id="@+id/textView_holder"
-		android:layout_width="wrap_content"
-		android:layout_height="wrap_content"
-		android:layout_gravity="center"
-		android:layout_margin="20dp"
-		android:gravity="center"
-		android:text="@string/text_downloads_holder"
-		android:textAppearance="?attr/textAppearanceBody2"
-		tools:visibility="visible" />
-
 </androidx.coordinatorlayout.widget.CoordinatorLayout>

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

@@ -3,26 +3,25 @@
 	xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
+	style="?materialCardViewFilledStyle"
 	android:layout_width="match_parent"
-	android:layout_height="wrap_content"
-	app:cardCornerRadius="16dp">
+	android:layout_height="wrap_content">
 
 	<androidx.constraintlayout.widget.ConstraintLayout
 		android:layout_width="match_parent"
 		android:layout_height="match_parent"
-		android:minHeight="@dimen/manga_list_details_item_height"
-		android:orientation="horizontal">
+		android:paddingBottom="12dp">
 
 		<com.google.android.material.imageview.ShapeableImageView
 			android:id="@+id/imageView_cover"
-			android:layout_width="92dp"
-			android:layout_height="0dp"
-			android:orientation="vertical"
+			android:layout_width="64dp"
+			android:layout_height="64dp"
+			android:layout_marginStart="12dp"
+			android:layout_marginTop="12dp"
 			android:scaleType="centerCrop"
-			app:layout_constraintDimensionRatio="H,13:18"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toTopOf="parent"
-			app:shapeAppearanceOverlay="@style/ShapeAppearanceOverlay.Kotatsu.Cover"
+			app:shapeAppearanceOverlay="@style/ShapeAppearanceOverlay.Kotatsu.Cover.Medium"
 			tools:src="@tools:sample/backgrounds/scenic" />
 
 		<TextView
@@ -30,7 +29,7 @@
 			android:layout_width="0dp"
 			android:layout_height="wrap_content"
 			android:layout_marginStart="16dp"
-			android:layout_marginTop="8dp"
+			android:layout_marginTop="12dp"
 			android:layout_marginEnd="12dp"
 			android:ellipsize="end"
 			android:singleLine="true"
@@ -40,16 +39,25 @@
 			app:layout_constraintTop_toTopOf="parent"
 			tools:text="@tools:sample/lorem" />
 
+		<androidx.constraintlayout.widget.Barrier
+			android:id="@+id/barrier_top"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			app:barrierDirection="bottom"
+			app:constraint_referenced_ids="imageView_cover, textView_status" />
+
 		<com.google.android.material.progressindicator.LinearProgressIndicator
 			android:id="@+id/progressBar"
 			android:layout_width="0dp"
 			android:layout_height="wrap_content"
-			android:layout_marginStart="16dp"
-			android:layout_marginTop="4dp"
+			android:layout_marginStart="12dp"
+			android:layout_marginTop="12dp"
 			android:layout_marginEnd="12dp"
 			app:layout_constraintEnd_toEndOf="parent"
-			app:layout_constraintStart_toEndOf="@id/imageView_cover"
-			app:layout_constraintTop_toBottomOf="@id/textView_title"
+			app:layout_constraintStart_toStartOf="parent"
+			app:layout_constraintTop_toBottomOf="@id/barrier_top"
+			app:trackColor="?colorPrimaryContainer"
+			app:trackCornerRadius="12dp"
 			tools:progress="25" />
 
 		<TextView
@@ -64,7 +72,7 @@
 			android:textAppearance="?attr/textAppearanceBodySmall"
 			app:layout_constraintEnd_toStartOf="@id/textView_percent"
 			app:layout_constraintStart_toEndOf="@id/imageView_cover"
-			app:layout_constraintTop_toBottomOf="@id/progressBar"
+			app:layout_constraintTop_toBottomOf="@id/textView_title"
 			tools:text="@string/manga_downloading_" />
 
 		<TextView
@@ -72,8 +80,9 @@
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
 			android:layout_marginEnd="12dp"
+			android:layout_marginBottom="12dp"
 			android:textAppearance="?attr/textAppearanceBodyMedium"
-			app:layout_constraintBaseline_toBaselineOf="@id/textView_status"
+			app:layout_constraintBottom_toTopOf="@id/barrier_top"
 			app:layout_constraintEnd_toEndOf="parent"
 			tools:text="25%" />
 
@@ -87,39 +96,47 @@
 			android:ellipsize="end"
 			android:maxLines="4"
 			android:textAppearance="?attr/textAppearanceBodySmall"
-			app:layout_constraintEnd_toEndOf="parent"
+			app:layout_constraintEnd_toStartOf="@id/textView_percent"
 			app:layout_constraintStart_toEndOf="@id/imageView_cover"
 			app:layout_constraintTop_toBottomOf="@id/textView_status"
 			tools:text="@tools:sample/lorem[3]" />
 
 		<Button
-			android:id="@+id/button_resume"
-			style="@style/Widget.Material3.Button.TextButton"
+			android:id="@+id/button_pause"
+			style="?materialButtonOutlinedStyle"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
-			android:layout_marginEnd="4dp"
-			android:layout_marginBottom="4dp"
-			android:text="@string/try_again"
+			android:layout_marginTop="8dp"
+			android:layout_marginEnd="12dp"
+			android:text="@string/pause"
 			android:visibility="gone"
-			app:layout_constraintBottom_toBottomOf="parent"
-			app:layout_constraintEnd_toStartOf="@id/button_cancel"
-			app:layout_constraintTop_toBottomOf="@id/textView_details"
-			app:layout_constraintVertical_bias="1"
+			app:layout_constraintEnd_toStartOf="@id/button_resume"
+			app:layout_constraintTop_toBottomOf="@id/progressBar"
 			tools:visibility="visible" />
 
 		<Button
-			android:id="@+id/button_cancel"
-			style="@style/Widget.Material3.Button.TextButton"
+			android:id="@+id/button_resume"
+			style="?materialButtonOutlinedStyle"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
-			android:layout_marginEnd="4dp"
-			android:layout_marginBottom="4dp"
+			android:layout_marginTop="8dp"
+			android:layout_marginEnd="12dp"
+			android:text="@string/resume"
+			android:visibility="gone"
+			app:layout_constraintEnd_toStartOf="@id/button_cancel"
+			app:layout_constraintTop_toBottomOf="@id/progressBar" />
+
+		<Button
+			android:id="@+id/button_cancel"
+			style="?materialButtonOutlinedStyle"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			android:layout_marginTop="8dp"
+			android:layout_marginEnd="12dp"
 			android:text="@android:string/cancel"
 			android:visibility="gone"
-			app:layout_constraintBottom_toBottomOf="parent"
 			app:layout_constraintEnd_toEndOf="parent"
-			app:layout_constraintTop_toBottomOf="@id/textView_details"
-			app:layout_constraintVertical_bias="1"
+			app:layout_constraintTop_toBottomOf="@id/progressBar"
 			tools:visibility="visible" />
 
 	</androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:app="http://schemas.android.com/apk/res-auto">
+
+	<item
+		android:id="@+id/action_resume"
+		android:icon="@drawable/ic_action_resume"
+		android:title="@string/resume"
+		app:showAsAction="ifRoom|withText" />
+
+	<item
+		android:id="@+id/action_pause"
+		android:icon="@drawable/ic_action_pause"
+		android:title="@string/pause"
+		app:showAsAction="ifRoom|withText" />
+
+	<item
+		android:id="@+id/action_cancel"
+		android:icon="@drawable/abc_ic_clear_material"
+		android:title="@android:string/cancel"
+		app:showAsAction="ifRoom|withText" />
+
+	<item
+		android:id="@+id/action_remove"
+		android:icon="@drawable/ic_delete"
+		android:title="@string/remove"
+		app:showAsAction="ifRoom|withText" />
+
+	<item
+		android:id="@+id/action_select_all"
+		android:icon="?actionModeSelectAllDrawable"
+		android:title="@android:string/selectAll"
+		app:showAsAction="ifRoom|withText" />
+
+</menu>

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

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:app="http://schemas.android.com/apk/res-auto">
+
+	<item
+		android:id="@+id/action_pause"
+		android:icon="@drawable/ic_action_pause"
+		android:title="@string/pause"
+		android:visible="false"
+		app:showAsAction="ifRoom|withText" />
+
+	<item
+		android:id="@+id/action_resume"
+		android:icon="@drawable/ic_action_resume"
+		android:title="@string/resume"
+		android:visible="false"
+		app:showAsAction="ifRoom|withText" />
+
+	<item
+		android:id="@+id/action_cancel_all"
+		android:title="@string/cancel_all"
+		app:showAsAction="never" />
+
+	<item
+		android:id="@+id/action_remove_completed"
+		android:title="@string/remove_completed"
+		app:showAsAction="never" />
+
+</menu>

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

@@ -441,4 +441,11 @@
 	<string name="ignore_ssl_errors">Ignore SSL errors</string>
 	<string name="mirror_switching">Choose mirror automatically</string>
 	<string name="mirror_switching_summary">Automatically switch domains for remote sources on errors if mirrors are available</string>
+	<string name="pause">Pause</string>
+	<string name="resume">Resume</string>
+	<string name="paused">Paused</string>
+	<string name="remove_completed">Remove completed</string>
+	<string name="cancel_all">Cancel all</string>
+	<string name="downloads_wifi_only">Download only via Wi-Fi</string>
+	<string name="downloads_wifi_only_summary">Stop downloading when switching to a mobile network</string>
 </resources>

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

@@ -238,6 +238,10 @@
 		<item name="cornerSize">16dp</item>
 	</style>
 
+	<style name="ShapeAppearanceOverlay.Kotatsu.Cover.Medium" parent="">
+		<item name="cornerSize">12dp</item>
+	</style>
+
 	<style name="ShapeAppearanceOverlay.Kotatsu.Cover.Small" parent="">
 		<item name="cornerSize">6dp</item>
 	</style>

app/src/main/res/xml/pref_content.xml

@@ -30,26 +30,6 @@
 		app:useSimpleSummaryProvider="true"
 		tools:isPreferenceVisible="true" />
 
-	<Preference
-		android:key="local_storage"
-		android:persistent="false"
-		android:title="@string/manga_save_location"
-		app:allowDividerAbove="true" />
-
-	<SwitchPreferenceCompat
-		android:defaultValue="false"
-		android:key="downloads_slowdown"
-		android:summary="@string/download_slowdown_summary"
-		android:title="@string/download_slowdown" />
-
-	<org.koitharu.kotatsu.settings.utils.SliderPreference
-		android:key="downloads_parallelism"
-		android:stepSize="1"
-		android:title="@string/parallel_downloads"
-		android:valueFrom="1"
-		android:valueTo="5"
-		app:defaultValue="2" />
-
 	<ListPreference
 		android:entries="@array/doh_providers"
 		android:key="doh"
@@ -67,9 +47,25 @@
 		android:summary="@string/mirror_switching_summary"
 		android:title="@string/mirror_switching" />
 
-	<PreferenceScreen
-		android:fragment="org.koitharu.kotatsu.settings.backup.BackupSettingsFragment"
-		android:title="@string/backup_restore"
-		app:allowDividerAbove="true" />
+	<PreferenceCategory android:title="@string/downloads">
+
+		<Preference
+			android:key="local_storage"
+			android:persistent="false"
+			android:title="@string/manga_save_location" />
+
+		<SwitchPreferenceCompat
+			android:defaultValue="false"
+			android:key="downloads_wifi"
+			android:summary="@string/downloads_wifi_only_summary"
+			android:title="@string/downloads_wifi_only" />
+
+		<SwitchPreferenceCompat
+			android:defaultValue="false"
+			android:key="downloads_slowdown"
+			android:summary="@string/download_slowdown_summary"
+			android:title="@string/download_slowdown" />
+
+	</PreferenceCategory>
 
 </PreferenceScreen>

app/src/main/res/xml/pref_root.xml

@@ -34,6 +34,11 @@
 		android:icon="@drawable/ic_feed"
 		android:title="@string/check_for_new_chapters" />
 
+	<PreferenceScreen
+		android:fragment="org.koitharu.kotatsu.settings.backup.BackupSettingsFragment"
+		android:icon="@drawable/ic_backup_restore"
+		android:title="@string/backup_restore" />
+
 	<PreferenceScreen
 		android:fragment="org.koitharu.kotatsu.settings.about.AboutSettingsFragment"
 		android:icon="@drawable/ic_info_outline"