bump version to v0.4.2

* differentiate ContinuesHorizontalLTR and ContinuesHorizontalRTL

* fix displaying pages in horizontal viewer

* add scroll handler for horizontal mode

* update curPage when images pass through center of the screen

* add click events to navigate pages

* remove console.log

* fix click mapping for ContinuesHorizontalRTL

* remove disable eslint inline comment

* fix ContinuesHorizontalRTL not updating curPage on scroll

* add ability to click to drag

* add margin in between images

server/build.gradle.kts

@@ -93,7 +93,7 @@ sourceSets {
 }
 
 // should be bumped with each stable release
-val tachideskVersion = "v0.4.0"
+val tachideskVersion = "v0.4.2"
 
 // counts commit count on master
 val tachideskRevision = runCatching {

server/src/main/kotlin/eu/kanade/tachiyomi/animesource/AnimeCatalogueSource.kt

@@ -1,7 +1,7 @@
-package eu.kanade.tachiyomi.source
+package eu.kanade.tachiyomi.animesource
 
-import eu.kanade.tachiyomi.source.model.AnimesPage
-import eu.kanade.tachiyomi.source.model.FilterList
+import eu.kanade.tachiyomi.animesource.model.AnimeFilterList
+import eu.kanade.tachiyomi.animesource.model.AnimesPage
 import rx.Observable
 
 interface AnimeCatalogueSource : AnimeSource {
@@ -30,7 +30,7 @@ interface AnimeCatalogueSource : AnimeSource {
      * @param query the search query.
      * @param filters the list of filters to apply.
      */
-    fun fetchSearchAnime(page: Int, query: String, filters: FilterList): Observable<AnimesPage>
+    fun fetchSearchAnime(page: Int, query: String, filters: AnimeFilterList): Observable<AnimesPage>
 
     /**
      * Returns an observable containing a page with a list of latest anime updates.
@@ -42,5 +42,5 @@ interface AnimeCatalogueSource : AnimeSource {
     /**
      * Returns the list of filters for the source.
      */
-    fun getFilterList(): FilterList
+    fun getFilterList(): AnimeFilterList
 }

server/src/main/kotlin/eu/kanade/tachiyomi/animesource/AnimeSource.kt

@@ -1,7 +1,7 @@
-package eu.kanade.tachiyomi.source
+package eu.kanade.tachiyomi.animesource
 
-import eu.kanade.tachiyomi.source.model.SAnime
-import eu.kanade.tachiyomi.source.model.SEpisode
+import eu.kanade.tachiyomi.animesource.model.SAnime
+import eu.kanade.tachiyomi.animesource.model.SEpisode
 import rx.Observable
 
 /**

server/src/main/kotlin/eu/kanade/tachiyomi/animesource/AnimeSourceFactory.kt

@@ -1,4 +1,4 @@
-package eu.kanade.tachiyomi.source
+package eu.kanade.tachiyomi.animesource
 
 /**
  * A factory for creating sources at runtime.

server/src/main/kotlin/eu/kanade/tachiyomi/animesource/AnimeSourceManager.kt

@@ -1,9 +1,9 @@
-package eu.kanade.tachiyomi.source
+package eu.kanade.tachiyomi.animesource
 
 import android.content.Context
-import eu.kanade.tachiyomi.source.model.SAnime
-import eu.kanade.tachiyomi.source.model.SEpisode
-import eu.kanade.tachiyomi.source.online.AnimeHttpSource
+import eu.kanade.tachiyomi.animesource.model.SAnime
+import eu.kanade.tachiyomi.animesource.model.SEpisode
+import eu.kanade.tachiyomi.animesource.online.AnimeHttpSource
 import rx.Observable
 
 open class AnimeSourceManager(private val context: Context) {

server/src/main/kotlin/eu/kanade/tachiyomi/animesource/ConfigurableAnimeSource.kt

@@ -1,4 +1,4 @@
-package eu.kanade.tachiyomi.source
+package eu.kanade.tachiyomi.animesource
 
 import android.support.v7.preference.PreferenceScreen
 

server/src/main/kotlin/eu/kanade/tachiyomi/animesource/model/AnimeFilter.kt

@@ -0,0 +1,40 @@
+package eu.kanade.tachiyomi.animesource.model
+
+sealed class AnimeFilter<T>(val name: String, var state: T) {
+    open class Header(name: String) : AnimeFilter<Any>(name, 0)
+    open class Separator(name: String = "") : AnimeFilter<Any>(name, 0)
+    abstract class Select<V>(name: String, val values: Array<V>, state: Int = 0) : AnimeFilter<Int>(name, state)
+    abstract class Text(name: String, state: String = "") : AnimeFilter<String>(name, state)
+    abstract class CheckBox(name: String, state: Boolean = false) : AnimeFilter<Boolean>(name, state)
+    abstract class TriState(name: String, state: Int = STATE_IGNORE) : AnimeFilter<Int>(name, state) {
+        fun isIgnored() = state == STATE_IGNORE
+        fun isIncluded() = state == STATE_INCLUDE
+        fun isExcluded() = state == STATE_EXCLUDE
+
+        companion object {
+            const val STATE_IGNORE = 0
+            const val STATE_INCLUDE = 1
+            const val STATE_EXCLUDE = 2
+        }
+    }
+
+    abstract class Group<V>(name: String, state: List<V>) : AnimeFilter<List<V>>(name, state)
+
+    abstract class Sort(name: String, val values: Array<String>, state: Selection? = null) :
+        AnimeFilter<Sort.Selection?>(name, state) {
+        data class Selection(val index: Int, val ascending: Boolean)
+    }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (other !is AnimeFilter<*>) return false
+
+        return name == other.name && state == other.state
+    }
+
+    override fun hashCode(): Int {
+        var result = name.hashCode()
+        result = 31 * result + (state?.hashCode() ?: 0)
+        return result
+    }
+}

server/src/main/kotlin/eu/kanade/tachiyomi/animesource/model/AnimeFilterList.kt

@@ -0,0 +1,6 @@
+package eu.kanade.tachiyomi.animesource.model
+
+data class AnimeFilterList(val list: List<AnimeFilter<*>>) : List<AnimeFilter<*>> by list {
+
+    constructor(vararg fs: AnimeFilter<*>) : this(if (fs.isNotEmpty()) fs.asList() else emptyList())
+}

server/src/main/kotlin/eu/kanade/tachiyomi/animesource/model/AnimesPage.kt

@@ -1,3 +1,3 @@
-package eu.kanade.tachiyomi.source.model
+package eu.kanade.tachiyomi.animesource.model
 
 data class AnimesPage(val animes: List<SAnime>, val hasNextPage: Boolean)

server/src/main/kotlin/eu/kanade/tachiyomi/animesource/model/SAnime.kt

@@ -1,4 +1,4 @@
-package eu.kanade.tachiyomi.source.model
+package eu.kanade.tachiyomi.animesource.model
 
 import java.io.Serializable
 

server/src/main/kotlin/eu/kanade/tachiyomi/animesource/model/SAnimeImpl.kt

@@ -1,4 +1,4 @@
-package eu.kanade.tachiyomi.source.model
+package eu.kanade.tachiyomi.animesource.model
 
 class SAnimeImpl : SAnime {
 

server/src/main/kotlin/eu/kanade/tachiyomi/animesource/model/SEpisode.kt

@@ -1,4 +1,4 @@
-package eu.kanade.tachiyomi.source.model
+package eu.kanade.tachiyomi.animesource.model
 
 import java.io.Serializable
 

server/src/main/kotlin/eu/kanade/tachiyomi/animesource/model/SEpisodeImpl.kt

@@ -1,4 +1,4 @@
-package eu.kanade.tachiyomi.source.model
+package eu.kanade.tachiyomi.animesource.model
 
 class SEpisodeImpl : SEpisode {
 

server/src/main/kotlin/eu/kanade/tachiyomi/animesource/online/AnimeHttpSource.kt

@@ -1,15 +1,15 @@
-package eu.kanade.tachiyomi.source.online
+package eu.kanade.tachiyomi.animesource.online
 
+import eu.kanade.tachiyomi.animesource.AnimeCatalogueSource
+import eu.kanade.tachiyomi.animesource.model.AnimeFilterList
+import eu.kanade.tachiyomi.animesource.model.AnimesPage
+import eu.kanade.tachiyomi.animesource.model.SAnime
+import eu.kanade.tachiyomi.animesource.model.SEpisode
 import eu.kanade.tachiyomi.network.GET
 import eu.kanade.tachiyomi.network.NetworkHelper
 import eu.kanade.tachiyomi.network.asObservableSuccess
 import eu.kanade.tachiyomi.network.newCallWithProgress
-import eu.kanade.tachiyomi.source.AnimeCatalogueSource
-import eu.kanade.tachiyomi.source.model.AnimesPage
-import eu.kanade.tachiyomi.source.model.FilterList
 import eu.kanade.tachiyomi.source.model.Page
-import eu.kanade.tachiyomi.source.model.SAnime
-import eu.kanade.tachiyomi.source.model.SEpisode
 import okhttp3.Headers
 import okhttp3.OkHttpClient
 import okhttp3.Request
@@ -118,7 +118,7 @@ abstract class AnimeHttpSource : AnimeCatalogueSource {
      * @param query the search query.
      * @param filters the list of filters to apply.
      */
-    override fun fetchSearchAnime(page: Int, query: String, filters: FilterList): Observable<AnimesPage> {
+    override fun fetchSearchAnime(page: Int, query: String, filters: AnimeFilterList): Observable<AnimesPage> {
         return client.newCall(searchAnimeRequest(page, query, filters))
             .asObservableSuccess()
             .map { response ->
@@ -133,7 +133,7 @@ abstract class AnimeHttpSource : AnimeCatalogueSource {
      * @param query the search query.
      * @param filters the list of filters to apply.
      */
-    protected abstract fun searchAnimeRequest(page: Int, query: String, filters: FilterList): Request
+    protected abstract fun searchAnimeRequest(page: Int, query: String, filters: AnimeFilterList): Request
 
     /**
      * Parses the response from the site and returns a [AnimesPage] object.
@@ -380,7 +380,7 @@ abstract class AnimeHttpSource : AnimeCatalogueSource {
     /**
      * Returns the list of filters for the source.
      */
-    override fun getFilterList() = FilterList()
+    override fun getFilterList() = AnimeFilterList()
 
     companion object {
         const val DEFAULT_USER_AGENT = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.150 Safari/537.36 Edg/88.0.705.63"

server/src/main/kotlin/eu/kanade/tachiyomi/animesource/online/AnimeHttpSourceFetcher.kt

@@ -1,5 +1,6 @@
 package eu.kanade.tachiyomi.source.online
 
+import eu.kanade.tachiyomi.animesource.online.AnimeHttpSource
 import eu.kanade.tachiyomi.source.model.Page
 import rx.Observable
 

server/src/main/kotlin/eu/kanade/tachiyomi/animesource/online/ParsedAnimeHttpSource.kt

@@ -1,9 +1,9 @@
-package eu.kanade.tachiyomi.source.online
+package eu.kanade.tachiyomi.animesource.online
 
-import eu.kanade.tachiyomi.source.model.AnimesPage
+import eu.kanade.tachiyomi.animesource.model.AnimesPage
+import eu.kanade.tachiyomi.animesource.model.SAnime
+import eu.kanade.tachiyomi.animesource.model.SEpisode
 import eu.kanade.tachiyomi.source.model.Page
-import eu.kanade.tachiyomi.source.model.SAnime
-import eu.kanade.tachiyomi.source.model.SEpisode
 import eu.kanade.tachiyomi.util.asJsoup
 import okhttp3.Response
 import org.jsoup.nodes.Document

server/src/main/kotlin/suwayomi/anime/impl/Anime.kt

@@ -7,8 +7,8 @@ package suwayomi.anime.impl
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
+import eu.kanade.tachiyomi.animesource.model.SAnime
 import eu.kanade.tachiyomi.network.GET
-import eu.kanade.tachiyomi.source.model.SAnime
 import org.jetbrains.exposed.sql.select
 import org.jetbrains.exposed.sql.transactions.transaction
 import org.jetbrains.exposed.sql.update
@@ -102,7 +102,7 @@ object Anime {
                 fetchedAnime.description,
                 fetchedAnime.genre,
                 AnimeStatus.valueOf(fetchedAnime.status).name,
-                false,
+                animeEntry[AnimeTable.inLibrary],
                 getAnimeSource(animeEntry[AnimeTable.sourceReference]),
                 true
             )

server/src/main/kotlin/suwayomi/anime/impl/AnimeList.kt

@@ -7,7 +7,7 @@ package suwayomi.anime.impl
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-import eu.kanade.tachiyomi.source.model.AnimesPage
+import eu.kanade.tachiyomi.animesource.model.AnimesPage
 import org.jetbrains.exposed.sql.insertAndGetId
 import org.jetbrains.exposed.sql.select
 import org.jetbrains.exposed.sql.transactions.transaction

server/src/main/kotlin/suwayomi/anime/impl/Episode.kt

@@ -7,8 +7,8 @@ package suwayomi.anime.impl
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-import eu.kanade.tachiyomi.source.model.SAnime
-import eu.kanade.tachiyomi.source.model.SEpisode
+import eu.kanade.tachiyomi.animesource.model.SAnime
+import eu.kanade.tachiyomi.animesource.model.SEpisode
 import org.jetbrains.exposed.sql.SortOrder.DESC
 import org.jetbrains.exposed.sql.and
 import org.jetbrains.exposed.sql.deleteWhere

server/src/main/kotlin/suwayomi/anime/impl/extension/Extension.kt

@@ -8,11 +8,11 @@ package suwayomi.anime.impl.extension
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
 import android.net.Uri
+import eu.kanade.tachiyomi.animesource.AnimeCatalogueSource
+import eu.kanade.tachiyomi.animesource.AnimeSource
+import eu.kanade.tachiyomi.animesource.AnimeSourceFactory
 import eu.kanade.tachiyomi.network.GET
 import eu.kanade.tachiyomi.network.NetworkHelper
-import eu.kanade.tachiyomi.source.AnimeCatalogueSource
-import eu.kanade.tachiyomi.source.AnimeSource
-import eu.kanade.tachiyomi.source.AnimeSourceFactory
 import mu.KotlinLogging
 import okhttp3.Request
 import okio.buffer

server/src/main/kotlin/suwayomi/anime/impl/extension/github/ExtensionGithubApi.kt

@@ -13,6 +13,8 @@ import com.google.gson.JsonArray
 import com.google.gson.JsonParser
 import eu.kanade.tachiyomi.network.NetworkHelper
 import okhttp3.Request
+import suwayomi.anime.impl.util.PackageTools.LIB_VERSION_MAX
+import suwayomi.anime.impl.util.PackageTools.LIB_VERSION_MIN
 import suwayomi.anime.model.dataclass.AnimeExtensionDataClass
 import suwayomi.tachidesk.impl.util.network.UnzippingInterceptor
 import uy.kohesive.injekt.injectLazy
@@ -21,15 +23,12 @@ object ExtensionGithubApi {
     const val BASE_URL = "https://raw.githubusercontent.com"
     const val REPO_URL_PREFIX = "$BASE_URL/jmir1/tachiyomi-extensions/repo"
 
-    private const val LIB_VERSION_MIN = 1.3
-    private const val LIB_VERSION_MAX = 1.3
-
     private fun parseResponse(json: JsonArray): List<OnlineExtension> {
         return json
             .map { it.asJsonObject }
             .filter { element ->
                 val versionName = element["version"].string
-                val libVersion = versionName.substringBeforeLast('.').toDouble()
+                val libVersion = versionName.substringBeforeLast('.').toInt()
                 libVersion in LIB_VERSION_MIN..LIB_VERSION_MAX
             }
             .map { element ->

server/src/main/kotlin/suwayomi/anime/impl/extension/github/OnlineExtension.kt

@@ -1,5 +1,12 @@
 package suwayomi.anime.impl.extension.github
 
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
 data class OnlineExtension(
     val name: String,
     val pkgName: String,

server/src/main/kotlin/suwayomi/anime/impl/util/GetAnimeHttpSource.kt

@@ -7,9 +7,9 @@ package suwayomi.anime.impl.util
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-import eu.kanade.tachiyomi.source.AnimeSource
-import eu.kanade.tachiyomi.source.AnimeSourceFactory
-import eu.kanade.tachiyomi.source.online.AnimeHttpSource
+import eu.kanade.tachiyomi.animesource.AnimeSource
+import eu.kanade.tachiyomi.animesource.AnimeSourceFactory
+import eu.kanade.tachiyomi.animesource.online.AnimeHttpSource
 import org.jetbrains.exposed.sql.select
 import org.jetbrains.exposed.sql.transactions.transaction
 import org.kodein.di.DI

server/src/main/kotlin/suwayomi/anime/impl/util/PackageTools.kt

@@ -40,8 +40,8 @@ object PackageTools {
     const val METADATA_SOURCE_CLASS = "tachiyomi.animeextension.class"
     const val METADATA_SOURCE_FACTORY = "tachiyomi.animeextension.factory"
     const val METADATA_NSFW = "tachiyomi.animeextension.nsfw"
-    const val LIB_VERSION_MIN = 1.3
-    const val LIB_VERSION_MAX = 1.3
+    const val LIB_VERSION_MIN = 10
+    const val LIB_VERSION_MAX = 10
 
     private const val officialSignature = "50ab1d1e3a20d204d0ad6d334c7691c632e41b98dfa132bf385695fdfa63839c" // jmir1's key
     var trustedSignatures = mutableSetOf<String>() + officialSignature

server/src/main/kotlin/suwayomi/anime/model/table/AnimeTable.kt

@@ -7,7 +7,7 @@ package suwayomi.anime.model.table
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-import eu.kanade.tachiyomi.source.model.SAnime
+import eu.kanade.tachiyomi.animesource.model.SAnime
 import org.jetbrains.exposed.dao.id.IntIdTable
 import org.jetbrains.exposed.sql.ResultRow
 import suwayomi.tachidesk.impl.MangaList.proxyThumbnailUrl

server/src/main/kotlin/suwayomi/server/database/migration/M0005_AnimeTablesBatch2.kt

@@ -1,6 +1,6 @@
 package suwayomi.server.database.migration
 
-import eu.kanade.tachiyomi.source.model.SAnime
+import eu.kanade.tachiyomi.animesource.model.SAnime
 import org.jetbrains.exposed.dao.id.IntIdTable
 import org.jetbrains.exposed.sql.SchemaUtils
 import org.jetbrains.exposed.sql.transactions.transaction

server/src/main/kotlin/suwayomi/server/database/migration/M0007_ChapterIsDownloaded.kt

@@ -0,0 +1,24 @@
+package suwayomi.server.database.migration
+
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+import org.jetbrains.exposed.sql.transactions.TransactionManager
+import org.jetbrains.exposed.sql.vendors.currentDialect
+import suwayomi.server.database.migration.lib.Migration
+
+@Suppress("ClassName", "unused")
+class M0007_ChapterIsDownloaded : Migration() {
+    /** this migration added IS_DOWNLOADED to CHAPTER */
+    override fun run() {
+        with(TransactionManager.current()) {
+            exec("ALTER TABLE CHAPTER ADD COLUMN IS_DOWNLOADED BOOLEAN DEFAULT FALSE")
+            commit()
+            currentDialect.resetCaches()
+        }
+    }
+}

server/src/main/kotlin/suwayomi/server/database/migration/M0008_ChapterPageCount.kt

@@ -0,0 +1,24 @@
+package suwayomi.server.database.migration
+
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+import org.jetbrains.exposed.sql.transactions.TransactionManager
+import org.jetbrains.exposed.sql.vendors.currentDialect
+import suwayomi.server.database.migration.lib.Migration
+
+@Suppress("ClassName", "unused")
+class M0008_ChapterPageCount : Migration() {
+    /** this migration added PAGE_COUNT to CHAPTER */
+    override fun run() {
+        with(TransactionManager.current()) {
+            exec("ALTER TABLE CHAPTER ADD COLUMN PAGE_COUNT INT DEFAULT -1")
+            commit()
+            currentDialect.resetCaches()
+        }
+    }
+}

server/src/main/kotlin/suwayomi/server/database/migration/M0009_ChapterLastReadAt.kt

@@ -0,0 +1,25 @@
+package suwayomi.server.database.migration
+
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+import org.jetbrains.exposed.sql.transactions.TransactionManager
+import org.jetbrains.exposed.sql.vendors.currentDialect
+import suwayomi.server.database.migration.lib.Migration
+
+@Suppress("ClassName", "unused")
+class M0009_ChapterLastReadAt : Migration() {
+    /** this migration added PAGE_COUNT to CHAPTER */
+    override fun run() {
+        with(TransactionManager.current()) {
+            // BIGINT == Long
+            exec("ALTER TABLE CHAPTER ADD COLUMN LAST_READ_AT BIGINT DEFAULT 0")
+            commit()
+            currentDialect.resetCaches()
+        }
+    }
+}

server/src/main/kotlin/suwayomi/server/util/AppExit.kt

@@ -1,5 +1,12 @@
 package suwayomi.server.util
 
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
 import mu.KotlinLogging
 import kotlin.system.exitProcess
 

server/src/main/kotlin/suwayomi/tachidesk/TachideskAPI.kt

@@ -33,6 +33,7 @@ import suwayomi.tachidesk.impl.Source.getSourceList
 import suwayomi.tachidesk.impl.backup.BackupFlags
 import suwayomi.tachidesk.impl.backup.legacy.LegacyBackupExport.createLegacyBackup
 import suwayomi.tachidesk.impl.backup.legacy.LegacyBackupImport.restoreLegacyBackup
+import suwayomi.tachidesk.impl.download.DownloadManager
 import suwayomi.tachidesk.impl.extension.Extension.getExtensionIcon
 import suwayomi.tachidesk.impl.extension.Extension.installExtension
 import suwayomi.tachidesk.impl.extension.Extension.uninstallExtension
@@ -383,15 +384,56 @@ object TachideskAPI {
         // Download queue stats
         app.ws("/api/v1/downloads") { ws ->
             ws.onConnect { ctx ->
-                // TODO: send current stat
-                // TODO: add to downlad subscribers
+                DownloadManager.addClient(ctx)
+                DownloadManager.notifyClient(ctx)
             }
-            ws.onMessage {
-                // TODO: send current stat
+            ws.onMessage { ctx ->
+                DownloadManager.handleRequest(ctx)
             }
             ws.onClose { ctx ->
-                // TODO: remove from subscribers
+                DownloadManager.removeClient(ctx)
             }
         }
+
+        // Start the downloader
+        app.get("/api/v1/downloads/start") { ctx ->
+            DownloadManager.start()
+
+            ctx.status(200)
+        }
+
+        // Stop the downloader
+        app.get("/api/v1/downloads/stop") { ctx ->
+            DownloadManager.stop()
+
+            ctx.status(200)
+        }
+
+        // clear download queue
+        app.get("/api/v1/downloads/clear") { ctx ->
+            DownloadManager.clear()
+
+            ctx.status(200)
+        }
+
+        // Queue chapter for download
+        app.get("/api/v1/download/:mangaId/chapter/:chapterIndex") { ctx ->
+            val chapterIndex = ctx.pathParam("chapterIndex").toInt()
+            val mangaId = ctx.pathParam("mangaId").toInt()
+
+            DownloadManager.enqueue(chapterIndex, mangaId)
+
+            ctx.status(200)
+        }
+
+        // delete chapter from download queue
+        app.delete("/api/v1/download/:mangaId/chapter/:chapterIndex") { ctx ->
+            val chapterIndex = ctx.pathParam("chapterIndex").toInt()
+            val mangaId = ctx.pathParam("mangaId").toInt()
+
+            DownloadManager.unqueue(chapterIndex, mangaId)
+
+            ctx.status(200)
+        }
     }
 }

server/src/main/kotlin/suwayomi/tachidesk/impl/Chapter.kt

@@ -24,6 +24,7 @@ import suwayomi.tachidesk.model.table.ChapterTable
 import suwayomi.tachidesk.model.table.MangaTable
 import suwayomi.tachidesk.model.table.PageTable
 import suwayomi.tachidesk.model.table.toDataClass
+import java.time.Instant
 
 object Chapter {
     /** get chapter list when showing a manga */
@@ -88,7 +89,7 @@ object Chapter {
         // clear any orphaned chapters that are in the db but not in `chapterList`
         val dbChapterCount = transaction { ChapterTable.select { ChapterTable.manga eq mangaId }.count() }
         if (dbChapterCount > chapterCount) { // we got some clean up due
-            val dbChapterList = transaction { ChapterTable.select { ChapterTable.manga eq mangaId } }
+            val dbChapterList = transaction { ChapterTable.select { ChapterTable.manga eq mangaId }.toList() }
 
             dbChapterList.forEach {
                 if (it[ChapterTable.chapterIndex] >= chapterList.size ||
@@ -122,9 +123,14 @@ object Chapter {
                 dbChapter[ChapterTable.isRead],
                 dbChapter[ChapterTable.isBookmarked],
                 dbChapter[ChapterTable.lastPageRead],
+                dbChapter[ChapterTable.lastReadAt],
 
                 chapterCount - index,
-                chapterList.size
+                dbChapter[ChapterTable.isDownloaded],
+
+                dbChapter[ChapterTable.pageCount],
+
+                chapterList.size,
             )
         }
     }
@@ -136,54 +142,68 @@ object Chapter {
                 (ChapterTable.chapterIndex eq chapterIndex) and (ChapterTable.manga eq mangaId)
             }.first()
         }
-        val mangaEntry = transaction { MangaTable.select { MangaTable.id eq mangaId }.first() }
-        val source = getHttpSource(mangaEntry[MangaTable.sourceReference])
 
-        val pageList = source.fetchPageList(
-            SChapter.create().apply {
-                url = chapterEntry[ChapterTable.url]
-                name = chapterEntry[ChapterTable.name]
-            }
-        ).awaitSingle()
+        return if (!chapterEntry[ChapterTable.isDownloaded]) {
+            val mangaEntry = transaction { MangaTable.select { MangaTable.id eq mangaId }.first() }
+            val source = getHttpSource(mangaEntry[MangaTable.sourceReference])
 
-        val chapterId = chapterEntry[ChapterTable.id].value
-        val chapterCount = transaction { ChapterTable.select { ChapterTable.manga eq mangaId }.count() }
+            val pageList = source.fetchPageList(
+                SChapter.create().apply {
+                    url = chapterEntry[ChapterTable.url]
+                    name = chapterEntry[ChapterTable.name]
+                }
+            ).awaitSingle()
 
-        // update page list for this chapter
-        transaction {
-            pageList.forEach { page ->
-                val pageEntry = transaction { PageTable.select { (PageTable.chapter eq chapterId) and (PageTable.index eq page.index) }.firstOrNull() }
-                if (pageEntry == null) {
-                    PageTable.insert {
-                        it[index] = page.index
-                        it[url] = page.url
-                        it[imageUrl] = page.imageUrl
-                        it[chapter] = chapterId
-                    }
-                } else {
-                    PageTable.update({ (PageTable.chapter eq chapterId) and (PageTable.index eq page.index) }) {
-                        it[url] = page.url
-                        it[imageUrl] = page.imageUrl
+            val chapterId = chapterEntry[ChapterTable.id].value
+            val chapterCount = transaction { ChapterTable.select { ChapterTable.manga eq mangaId }.count() }
+
+            // update page list for this chapter
+            transaction {
+                pageList.forEach { page ->
+                    val pageEntry = transaction { PageTable.select { (PageTable.chapter eq chapterId) and (PageTable.index eq page.index) }.firstOrNull() }
+                    if (pageEntry == null) {
+                        PageTable.insert {
+                            it[index] = page.index
+                            it[url] = page.url
+                            it[imageUrl] = page.imageUrl
+                            it[chapter] = chapterId
+                        }
+                    } else {
+                        PageTable.update({ (PageTable.chapter eq chapterId) and (PageTable.index eq page.index) }) {
+                            it[url] = page.url
+                            it[imageUrl] = page.imageUrl
+                        }
                     }
                 }
             }
+
+            val pageCount = pageList.count()
+
+            transaction {
+                ChapterTable.update({ (ChapterTable.manga eq mangaId) and (ChapterTable.chapterIndex eq chapterIndex) }) {
+                    it[ChapterTable.pageCount] = pageCount
+                }
+            }
+            return ChapterDataClass(
+                chapterEntry[ChapterTable.url],
+                chapterEntry[ChapterTable.name],
+                chapterEntry[ChapterTable.date_upload],
+                chapterEntry[ChapterTable.chapter_number],
+                chapterEntry[ChapterTable.scanlator],
+                mangaId,
+                chapterEntry[ChapterTable.isRead],
+                chapterEntry[ChapterTable.isBookmarked],
+                chapterEntry[ChapterTable.lastPageRead],
+                chapterEntry[ChapterTable.lastReadAt],
+
+                chapterEntry[ChapterTable.chapterIndex],
+                chapterEntry[ChapterTable.isDownloaded],
+                pageCount,
+                chapterCount.toInt()
+            )
+        } else {
+            ChapterTable.toDataClass(chapterEntry)
         }
-
-        return ChapterDataClass(
-            chapterEntry[ChapterTable.url],
-            chapterEntry[ChapterTable.name],
-            chapterEntry[ChapterTable.date_upload],
-            chapterEntry[ChapterTable.chapter_number],
-            chapterEntry[ChapterTable.scanlator],
-            mangaId,
-            chapterEntry[ChapterTable.isRead],
-            chapterEntry[ChapterTable.isBookmarked],
-            chapterEntry[ChapterTable.lastPageRead],
-
-            chapterEntry[ChapterTable.chapterIndex],
-            chapterCount.toInt(),
-            pageList.count()
-        )
     }
 
     fun modifyChapter(mangaId: Int, chapterIndex: Int, isRead: Boolean?, isBookmarked: Boolean?, markPrevRead: Boolean?, lastPageRead: Int?) {
@@ -198,6 +218,7 @@ object Chapter {
                     }
                     lastPageRead?.also {
                         update[ChapterTable.lastPageRead] = it
+                        update[ChapterTable.lastReadAt] = Instant.now().epochSecond
                     }
                 }
             }

server/src/main/kotlin/suwayomi/tachidesk/impl/Manga.kt

@@ -102,7 +102,7 @@ object Manga {
                 fetchedManga.description,
                 fetchedManga.genre,
                 MangaStatus.valueOf(fetchedManga.status).name,
-                false,
+                mangaEntry[MangaTable.inLibrary],
                 getSource(mangaEntry[MangaTable.sourceReference]),
                 true
             )

server/src/main/kotlin/suwayomi/tachidesk/impl/download/DownloadManager.kt

@@ -0,0 +1,129 @@
+package suwayomi.tachidesk.impl.download
+
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+import io.javalin.websocket.WsContext
+import io.javalin.websocket.WsMessageContext
+import org.jetbrains.exposed.sql.and
+import org.jetbrains.exposed.sql.select
+import org.jetbrains.exposed.sql.transactions.transaction
+import suwayomi.tachidesk.impl.download.model.DownloadChapter
+import suwayomi.tachidesk.impl.download.model.DownloadState.Downloading
+import suwayomi.tachidesk.impl.download.model.DownloadStatus
+import suwayomi.tachidesk.model.table.ChapterTable
+import suwayomi.tachidesk.model.table.toDataClass
+import java.util.concurrent.ConcurrentHashMap
+import java.util.concurrent.CopyOnWriteArrayList
+
+object DownloadManager {
+    private val clients = ConcurrentHashMap<String, WsContext>()
+    private val downloadQueue = CopyOnWriteArrayList<DownloadChapter>()
+    private var downloader: Downloader? = null
+
+    fun addClient(ctx: WsContext) {
+        clients[ctx.sessionId] = ctx
+    }
+
+    fun removeClient(ctx: WsContext) {
+        clients.remove(ctx.sessionId)
+    }
+
+    fun notifyClient(ctx: WsContext) {
+        ctx.send(
+            getStatus()
+        )
+    }
+
+    fun handleRequest(ctx: WsMessageContext) {
+        when (ctx.message()) {
+            "STATUS" -> notifyClient(ctx)
+            else -> ctx.send(
+                """
+                        |Invalid command.
+                        |Supported commands are:
+                        |    - STATUS
+                        |       sends the current download status
+                        |""".trimMargin()
+            )
+        }
+    }
+
+    private fun notifyAllClients() {
+        val status = getStatus()
+        clients.forEach {
+            it.value.send(status)
+        }
+    }
+
+    private fun getStatus(): DownloadStatus {
+        return DownloadStatus(
+            if (downloader == null ||
+                downloadQueue.none { it.state == Downloading }
+            ) "Stopped" else "Started",
+            downloadQueue
+        )
+    }
+
+    fun enqueue(chapterIndex: Int, mangaId: Int) {
+        if (downloadQueue.none { it.mangaId == mangaId && it.chapterIndex == chapterIndex }) {
+            downloadQueue.add(
+                DownloadChapter(
+                    chapterIndex,
+                    mangaId,
+                    chapter = ChapterTable.toDataClass(
+                        transaction {
+                            ChapterTable.select { (ChapterTable.manga eq mangaId) and (ChapterTable.chapterIndex eq chapterIndex) }
+                                .first()
+                        }
+                    )
+                )
+            )
+            start()
+        }
+        notifyAllClients()
+    }
+
+    fun unqueue(chapterIndex: Int, mangaId: Int) {
+        downloadQueue.removeIf { it.mangaId == mangaId && it.chapterIndex == chapterIndex }
+        notifyAllClients()
+    }
+
+    fun start() {
+        if (downloader != null && !downloader?.isAlive!!) // doesn't exist or is dead
+            downloader = null
+
+        if (downloader == null) {
+            downloader = Downloader(downloadQueue) { notifyAllClients() }
+            downloader!!.start()
+        }
+
+        notifyAllClients()
+    }
+
+    fun stop() {
+        downloader?.let {
+            synchronized(it.shouldStop) {
+                it.shouldStop = true
+            }
+        }
+        downloader = null
+        notifyAllClients()
+    }
+
+    fun clear() {
+        stop()
+        downloadQueue.clear()
+        notifyAllClients()
+    }
+}
+
+enum class DownloaderState(val state: Int) {
+    Stopped(0),
+    Running(1),
+    Paused(2),
+}

server/src/main/kotlin/suwayomi/tachidesk/impl/download/Downloader.kt

@@ -1,28 +1,81 @@
 package suwayomi.tachidesk.impl.download
 
-import org.jetbrains.exposed.sql.ResultRow
-import java.util.concurrent.LinkedBlockingQueue
-
 /*
  * Copyright (C) Contributors to the Suwayomi project
- * 
+ *
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-data class Download(
-    val chapter: ResultRow,
-)
+import kotlinx.coroutines.runBlocking
+import org.jetbrains.exposed.sql.and
+import org.jetbrains.exposed.sql.transactions.transaction
+import org.jetbrains.exposed.sql.update
+import suwayomi.tachidesk.impl.Chapter.getChapter
+import suwayomi.tachidesk.impl.Page.getPageImage
+import suwayomi.tachidesk.impl.download.model.DownloadChapter
+import suwayomi.tachidesk.impl.download.model.DownloadState.Downloading
+import suwayomi.tachidesk.impl.download.model.DownloadState.Error
+import suwayomi.tachidesk.impl.download.model.DownloadState.Finished
+import suwayomi.tachidesk.impl.download.model.DownloadState.Queued
+import suwayomi.tachidesk.model.table.ChapterTable
+import java.util.concurrent.CopyOnWriteArrayList
 
-private val downloadQueue = LinkedBlockingQueue<Download>()
+class Downloader(private val downloadQueue: CopyOnWriteArrayList<DownloadChapter>, val notifier: () -> Unit) : Thread() {
+    var shouldStop: Boolean = false
 
-class Downloader {
+    class DownloadShouldStopException : Exception()
 
-    fun start() {
-        TODO()
+    fun step() {
+        notifier()
+        synchronized(shouldStop) {
+            if (shouldStop) throw DownloadShouldStopException()
+        }
     }
 
-    fun stop() {
-        TODO()
+    override fun run() {
+        do {
+            val download = downloadQueue.firstOrNull {
+                it.state == Queued ||
+                    (it.state == Error && it.tries < 3) // 3 re-tries per download
+            } ?: break
+
+            try {
+                download.state = Downloading
+                step()
+
+                download.chapter = runBlocking { getChapter(download.chapterIndex, download.mangaId) }
+                step()
+
+                val pageCount = download.chapter!!.pageCount
+                for (pageNum in 0 until pageCount) {
+                    runBlocking { getPageImage(download.mangaId, download.chapterIndex, pageNum) }
+                    // TODO: retry on error with 2,4,8 seconds of wait
+                    // TODO: download multiple pages at once, possible solution: rx observer's strategy is used in Tachiyomi
+                    // TODO: fine grained download percentage
+                    download.progress = (pageNum + 1).toFloat() / pageCount
+                    step()
+                }
+                download.state = Finished
+                transaction {
+                    ChapterTable.update({ (ChapterTable.manga eq download.mangaId) and (ChapterTable.chapterIndex eq download.chapterIndex) }) {
+                        it[isDownloaded] = true
+                    }
+                }
+                step()
+
+                downloadQueue.removeIf { it.mangaId == download.mangaId && it.chapterIndex == download.chapterIndex }
+                step()
+            } catch (e: DownloadShouldStopException) {
+                println("Downloader was stopped")
+                downloadQueue.filter { it.state == Downloading }.forEach { it.state = Queued }
+            } catch (e: Exception) {
+                println("Downloader faced an exception")
+                downloadQueue.filter { it.state == Downloading }.forEach { it.state = Error; it.tries++ }
+                e.printStackTrace()
+            } finally {
+                notifier()
+            }
+        } while (!shouldStop)
     }
 }

server/src/main/kotlin/suwayomi/tachidesk/impl/download/model/DownloadChapter.kt

@@ -0,0 +1,19 @@
+package suwayomi.tachidesk.impl.download.model
+
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+import suwayomi.tachidesk.model.dataclass.ChapterDataClass
+
+class DownloadChapter(
+    val chapterIndex: Int,
+    val mangaId: Int,
+    var state: DownloadState = DownloadState.Queued,
+    var progress: Float = 0f,
+    var tries: Int = 0,
+    var chapter: ChapterDataClass? = null,
+)

server/src/main/kotlin/suwayomi/tachidesk/impl/download/model/DownloadState.kt

@@ -0,0 +1,15 @@
+package suwayomi.tachidesk.impl.download.model
+
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ * 
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+enum class DownloadState(val state: Int) {
+    Queued(0),
+    Downloading(1),
+    Finished(2),
+    Error(3),
+}

server/src/main/kotlin/suwayomi/tachidesk/impl/download/model/DownloadStatus.kt

@@ -0,0 +1,13 @@
+package suwayomi.tachidesk.impl.download.model
+
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ * 
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+data class DownloadStatus(
+    val status: String,
+    val queue: List<DownloadChapter>,
+)

server/src/main/kotlin/suwayomi/tachidesk/impl/extension/github/ExtensionGithubApi.kt

@@ -13,6 +13,8 @@ import com.google.gson.JsonArray
 import com.google.gson.JsonParser
 import eu.kanade.tachiyomi.network.NetworkHelper
 import okhttp3.Request
+import suwayomi.tachidesk.impl.util.PackageTools.LIB_VERSION_MAX
+import suwayomi.tachidesk.impl.util.PackageTools.LIB_VERSION_MIN
 import suwayomi.tachidesk.impl.util.network.UnzippingInterceptor
 import suwayomi.tachidesk.model.dataclass.ExtensionDataClass
 import uy.kohesive.injekt.injectLazy
@@ -21,9 +23,6 @@ object ExtensionGithubApi {
     const val BASE_URL = "https://raw.githubusercontent.com"
     const val REPO_URL_PREFIX = "$BASE_URL/tachiyomiorg/tachiyomi-extensions/repo"
 
-    private const val LIB_VERSION_MIN = 1.2
-    private const val LIB_VERSION_MAX = 1.2
-
     private fun parseResponse(json: JsonArray): List<OnlineExtension> {
         return json
             .map { it.asJsonObject }

server/src/main/kotlin/suwayomi/tachidesk/impl/extension/github/OnlineExtension.kt

@@ -1,5 +1,12 @@
 package suwayomi.tachidesk.impl.extension.github
 
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
 data class OnlineExtension(
     val name: String,
     val pkgName: String,

server/src/main/kotlin/suwayomi/tachidesk/impl/util/storage/CachedImageResponse.kt

@@ -8,6 +8,7 @@ package suwayomi.tachidesk.impl.util.storage
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
 import okhttp3.Response
+import okhttp3.internal.closeQuietly
 import java.io.File
 import java.io.FileInputStream
 import java.io.InputStream
@@ -41,20 +42,22 @@ object CachedImageResponse {
         val response = fetcher()
 
         if (response.code == 200) {
-            val fullPath = "$filePath.tmp"
-            val saveFile = File(fullPath)
-            response.body!!.source().saveTo(saveFile)
+            val tmpSavePath = "$filePath.tmp"
+            val tmpSaveFile = File(tmpSavePath)
+            response.body!!.source().saveTo(tmpSaveFile)
 
             // find image type
             val imageType = response.headers["content-type"]
-                ?: ImageUtil.findImageType { saveFile.inputStream() }?.mime
+                ?: ImageUtil.findImageType { tmpSaveFile.inputStream() }?.mime
                 ?: "image/jpeg"
-                    .substringAfter("image/")
 
-            saveFile.renameTo(File("$filePath.$imageType"))
+            val actualSavePath = "$filePath.${imageType.substringAfter("/")}"
 
-            return pathToInputStream(fullPath) to imageType
+            tmpSaveFile.renameTo(File(actualSavePath))
+
+            return pathToInputStream(actualSavePath) to imageType
         } else {
+            response.closeQuietly()
             throw Exception("request error! ${response.code}")
         }
     }

server/src/main/kotlin/suwayomi/tachidesk/model/dataclass/ChapterDataClass.kt

@@ -24,12 +24,19 @@ data class ChapterDataClass(
     /** last read page, zero means not read/no data */
     val lastPageRead: Int,
 
+    /** last read page, zero means not read/no data */
+    val lastReadAt: Long,
+
     /** this chapter's index, starts with 1 */
     val index: Int,
 
+    /** is chapter downloaded */
+    val downloaded: Boolean,
+
+    /** used to construct pages in the front-end */
+    val pageCount: Int = -1,
+
     /** total chapter count, used to calculate if there's a next and prev chapter */
     val chapterCount: Int? = null,
 
-    /** used to construct pages in the front-end */
-    val pageCount: Int? = null,
 )

server/src/main/kotlin/suwayomi/tachidesk/model/table/ChapterTable.kt

@@ -9,6 +9,8 @@ package suwayomi.tachidesk.model.table
 
 import org.jetbrains.exposed.dao.id.IntIdTable
 import org.jetbrains.exposed.sql.ResultRow
+import org.jetbrains.exposed.sql.select
+import org.jetbrains.exposed.sql.transactions.transaction
 import suwayomi.tachidesk.model.dataclass.ChapterDataClass
 
 object ChapterTable : IntIdTable() {
@@ -21,10 +23,15 @@ object ChapterTable : IntIdTable() {
     val isRead = bool("read").default(false)
     val isBookmarked = bool("bookmark").default(false)
     val lastPageRead = integer("last_page_read").default(0)
+    val lastReadAt = long("last_read_at").default(0)
 
     // index is reserved by a function
     val chapterIndex = integer("index")
 
+    val isDownloaded = bool("is_downloaded").default(false)
+
+    val pageCount = integer("page_count").default(-1)
+
     val manga = reference("manga", MangaTable)
 }
 
@@ -39,5 +46,9 @@ fun ChapterTable.toDataClass(chapterEntry: ResultRow) =
         chapterEntry[isRead],
         chapterEntry[isBookmarked],
         chapterEntry[lastPageRead],
+        chapterEntry[lastReadAt],
         chapterEntry[chapterIndex],
+        chapterEntry[isDownloaded],
+        chapterEntry[pageCount],
+        transaction { ChapterTable.select { ChapterTable.manga eq chapterEntry[manga].value }.count().toInt() },
     )

webUI/react/package.json

@@ -38,6 +38,7 @@
   },
   "devDependencies": {
     "@types/react": "^17.0.2",
+    "@types/react-beautiful-dnd": "^13.0.0",
     "@types/react-dom": "^17.0.2",
     "@types/react-lazyload": "^3.1.0",
     "@types/react-router-dom": "^5.1.7",

webUI/react/src/App.tsx

@@ -34,6 +34,7 @@ import SourceAnimes from 'screens/anime/SourceAnimes';
 import Reader from 'screens/manga/Reader';
 import Player from 'screens/anime/Player';
 import AnimeExtensions from 'screens/anime/AnimeExtensions';
+import DownloadQueue from 'screens/manga/DownloadQueue';
 
 export default function App() {
     const [title, setTitle] = useState<string>('Tachidesk');
@@ -125,6 +126,9 @@ export default function App() {
                             <Route path="/manga/sources">
                                 <MangaSources />
                             </Route>
+                            <Route path="/manga/downloads">
+                                <DownloadQueue />
+                            </Route>
                             <Route path="/manga/:mangaId/chapter/:chapterNum">
                                 <></>
                             </Route>

webUI/react/src/components/SpinnerImage.tsx

@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+import React, { useEffect, useState } from 'react';
+import CircularProgress from '@material-ui/core/CircularProgress';
+
+interface IProps {
+    src: string
+    alt: string
+
+    imgRef?: React.RefObject<HTMLImageElement>
+
+    spinnerClassName?: string
+    imgClassName?: string
+
+    onImageLoad?: () => void
+}
+
+export default function SpinnerImage(props: IProps) {
+    const {
+        src, alt, onImageLoad, imgRef, spinnerClassName, imgClassName,
+    } = props;
+    const [imageSrc, setImagsrc] = useState<string>('');
+
+    useEffect(() => {
+        const img = new Image();
+        img.src = src;
+
+        img.onload = () => {
+            setImagsrc(src);
+            onImageLoad?.();
+        };
+
+        return () => {
+            img.onload = null;
+        };
+    }, [src]);
+
+    if (imageSrc.length === 0) {
+        return (
+            // <div className={`${classes.image} ${classes.loadingImage}`}>
+            <div className={spinnerClassName}>
+                <CircularProgress thickness={5} />
+            </div>
+        );
+    }
+
+    return (
+        <img
+            className={imgClassName}
+            ref={imgRef}
+            src={imageSrc}
+            alt={alt}
+        />
+    );
+}
+
+SpinnerImage.defaultProps = {
+    spinnerClassName: '',
+    imgClassName: '',
+    onImageLoad: () => {},
+    imgRef: undefined,
+};

webUI/react/src/components/TemporaryDrawer.tsx

@@ -14,6 +14,7 @@ import ListItemIcon from '@material-ui/core/ListItemIcon';
 import CollectionsBookmarkIcon from '@material-ui/icons/CollectionsBookmark';
 import ExploreIcon from '@material-ui/icons/Explore';
 import ExtensionIcon from '@material-ui/icons/Extension';
+import GetAppIcon from '@material-ui/icons/GetApp';
 import ListItemText from '@material-ui/core/ListItemText';
 import SettingsIcon from '@material-ui/icons/Settings';
 import { Link } from 'react-router-dom';
@@ -87,6 +88,14 @@ export default function TemporaryDrawer({ drawerOpen, setDrawerOpen }: IProps) {
                                 <ListItemText primary="Anime Sources" />
                             </ListItem>
                         </Link>
+                        <Link to="/manga/downloads" style={{ color: 'inherit', textDecoration: 'none' }}>
+                            <ListItem button key="Manga Download Queue">
+                                <ListItemIcon>
+                                    <GetAppIcon />
+                                </ListItemIcon>
+                                <ListItemText primary="Manga Download Queue" />
+                            </ListItem>
+                        </Link>
                         <Link to="/settings" style={{ color: 'inherit', textDecoration: 'none' }}>
                             <ListItem button key="settings">
                                 <ListItemIcon>

webUI/react/src/components/manga/ChapterCard.tsx

@@ -47,12 +47,13 @@ const useStyles = makeStyles((theme) => ({
 interface IProps{
     chapter: IChapter
     triggerChaptersUpdate: () => void
+    downloadingString: string
 }
 
 export default function ChapterCard(props: IProps) {
     const classes = useStyles();
     const theme = useTheme();
-    const { chapter, triggerChaptersUpdate } = props;
+    const { chapter, triggerChaptersUpdate, downloadingString } = props;
 
     const dateStr = chapter.uploadDate && new Date(chapter.uploadDate).toISOString().slice(0, 10);
 
@@ -75,6 +76,11 @@ export default function ChapterCard(props: IProps) {
             .then(() => triggerChaptersUpdate());
     };
 
+    const downloadChapter = () => {
+        client.get(`/api/v1/download/${chapter.mangaId}/chapter/${chapter.index}`);
+        handleClose();
+    };
+
     const readChapterColor = theme.palette.type === 'dark' ? '#acacac' : '#b0b0b0';
     return (
         <>
@@ -101,6 +107,7 @@ export default function ChapterCard(props: IProps) {
                                         {chapter.scanlator}
                                         {chapter.scanlator && ' '}
                                         {dateStr}
+                                        {downloadingString}
                                     </Typography>
                                 </div>
                             </div>
@@ -115,7 +122,8 @@ export default function ChapterCard(props: IProps) {
                             open={Boolean(anchorEl)}
                             onClose={handleClose}
                         >
-                            {/* <MenuItem onClick={handleClose}>Download</MenuItem> */}
+                            {downloadingString.length === 0
+                            && <MenuItem onClick={downloadChapter}>Download</MenuItem> }
                             <MenuItem onClick={() => sendChange('bookmarked', !chapter.bookmarked)}>
                                 {chapter.bookmarked && 'Remove bookmark'}
                                 {!chapter.bookmarked && 'Bookmark'}

webUI/react/src/components/manga/MangaCard.tsx

@@ -9,11 +9,11 @@ import React from 'react';
 import { makeStyles } from '@material-ui/core/styles';
 import Card from '@material-ui/core/Card';
 import CardActionArea from '@material-ui/core/CardActionArea';
-import CardMedia from '@material-ui/core/CardMedia';
 import Typography from '@material-ui/core/Typography';
 import { Link } from 'react-router-dom';
 import { Grid } from '@material-ui/core';
 import useLocalStorage from 'util/useLocalStorage';
+import SpinnerImage from 'components/SpinnerImage';
 
 const useStyles = makeStyles({
     root: {
@@ -43,6 +43,11 @@ const useStyles = makeStyles({
         height: '100%',
         width: '100%',
     },
+
+    spinner: {
+        minHeight: '400px',
+        padding: '180px calc(50% - 20px)',
+    },
 });
 
 interface IProps {
@@ -63,12 +68,11 @@ const MangaCard = React.forwardRef((props: IProps, ref) => {
                 <Card className={classes.root} ref={ref}>
                     <CardActionArea>
                         <div className={classes.wrapper}>
-                            <CardMedia
-                                className={classes.image}
-                                component="img"
+                            <SpinnerImage
                                 alt={title}
-                                image={serverAddress + thumbnailUrl}
-                                title={title}
+                                src={serverAddress + thumbnailUrl}
+                                spinnerClassName={classes.spinner}
+                                imgClassName={classes.image}
                             />
                             <div className={classes.gradient} />
                             <Typography className={classes.title} variant="h5" component="h2">{title}</Typography>

webUI/react/src/components/manga/MangaDetails.tsx

@@ -198,7 +198,7 @@ export default function MangaDetails(props: IProps) {
             <div className={classes.top}>
                 <div className={classes.leftRight}>
                     <div className={classes.leftSide}>
-                        <img src={`${serverAddress}${manga.thumbnailUrl}?x=${Math.random()}`} alt="Manga Thumbnail" />
+                        <img src={`${serverAddress}${manga.thumbnailUrl}`} alt="Manga Thumbnail" />
                     </div>
                     <div className={classes.rightSide}>
                         <h1>

webUI/react/src/components/manga/reader/DoublePage.tsx

@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+import { makeStyles } from '@material-ui/core/styles';
+import React from 'react';
+
+const useStyles = (settings: IReaderSettings) => makeStyles({
+    image: {
+        display: 'block',
+        marginBottom: 0,
+        width: 'auto',
+        minHeight: '99vh',
+        height: 'auto',
+        maxHeight: '99vh',
+        objectFit: 'contain',
+    },
+    page: {
+        display: 'flex',
+        flexDirection: settings.readerType === 'DoubleLTR' ? 'row' : 'row-reverse',
+        justifyContent: 'center',
+        margin: '0 auto',
+        width: 'auto',
+        height: 'auto',
+        overflowX: 'scroll',
+    },
+});
+
+interface IProps {
+    index: number
+    image1src: string
+    image2src: string
+    settings: IReaderSettings
+}
+
+const DoublePage = React.forwardRef((props: IProps, ref: any) => {
+    const {
+        image1src, image2src, index, settings,
+    } = props;
+
+    const classes = useStyles(settings)();
+
+    return (
+        <div ref={ref} className={classes.page}>
+            <img
+                className={classes.image}
+                src={image1src}
+                alt={`Page #${index}`}
+            />
+            <img
+                className={classes.image}
+                src={image2src}
+                alt={`Page #${index + 1}`}
+            />
+        </div>
+    );
+});
+
+export default DoublePage;

webUI/react/src/components/manga/reader/Page.tsx

@@ -5,9 +5,37 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-import CircularProgress from '@material-ui/core/CircularProgress';
 import { makeStyles } from '@material-ui/core/styles';
-import React, { useEffect, useRef, useState } from 'react';
+import { CSSProperties } from '@material-ui/core/styles/withStyles';
+import React, { useEffect, useRef } from 'react';
+import SpinnerImage from 'components/SpinnerImage';
+
+function imageStyle(settings: IReaderSettings): CSSProperties {
+    if (settings.readerType === 'DoubleLTR'
+    || settings.readerType === 'DoubleRTL'
+    || settings.readerType === 'ContinuesHorizontalLTR'
+    || settings.readerType === 'ContinuesHorizontalRTL') {
+        return {
+            display: 'block',
+            marginLeft: '7px',
+            marginRight: '7px',
+            width: 'auto',
+            minHeight: '99vh',
+            height: 'auto',
+            maxHeight: '99vh',
+            objectFit: 'contain',
+            pointerEvents: 'none',
+        };
+    }
+
+    return {
+        display: 'block',
+        marginBottom: settings.readerType === 'ContinuesVertical' ? '15px' : 0,
+        minWidth: '50vw',
+        width: '100%',
+        maxWidth: '100%',
+    };
+}
 
 const useStyles = (settings: IReaderSettings) => makeStyles({
     loading: {
@@ -22,87 +50,67 @@ const useStyles = (settings: IReaderSettings) => makeStyles({
         backgroundColor: '#525252',
         marginBottom: 10,
     },
-    image: {
-        display: 'block',
-        marginBottom: settings.readerType === 'ContinuesVertical' ? '15px' : 0,
-        minWidth: '50vw',
-        width: '100%',
-        maxWidth: '100%',
-    },
+    image: imageStyle(settings),
 });
 
 interface IProps {
     src: string
     index: number
+    onImageLoad: () => void
     setCurPage: React.Dispatch<React.SetStateAction<number>>
     settings: IReaderSettings
 }
 
-function LazyImage(props: IProps) {
+const Page = React.forwardRef((props: IProps, ref: any) => {
     const {
-        src, index, setCurPage, settings,
+        src, index, onImageLoad, setCurPage, settings,
     } = props;
 
     const classes = useStyles(settings)();
-    const [imageSrc, setImagsrc] = useState<string>('');
-    const ref = useRef<HTMLImageElement>(null);
+    const imgRef = useRef<HTMLImageElement>(null);
 
-    const handleScroll = () => {
-        if (ref.current) {
-            const rect = ref.current.getBoundingClientRect();
+    const handleVerticalScroll = () => {
+        if (imgRef.current) {
+            const rect = imgRef.current.getBoundingClientRect();
             if (rect.y < 0 && rect.y + rect.height > 0) {
                 setCurPage(index);
             }
         }
     };
 
-    useEffect(() => {
-        if (settings.readerType === 'Webtoon' || settings.readerType === 'ContinuesVertical') {
-            window.addEventListener('scroll', handleScroll);
-
-            return () => {
-                window.removeEventListener('scroll', handleScroll);
-            };
-        } return () => {};
-    }, [handleScroll]);
+    const handleHorizontalScroll = () => {
+        if (imgRef.current) {
+            const rect = imgRef.current.getBoundingClientRect();
+            if (rect.left <= window.innerWidth / 2 && rect.right > window.innerWidth / 2) {
+                setCurPage(index);
+            }
+        }
+    };
 
     useEffect(() => {
-        const img = new Image();
-        img.src = src;
-
-        img.onload = () => setImagsrc(src);
-    }, [src]);
-
-    if (imageSrc.length === 0) {
-        return (
-            <div className={`${classes.image} ${classes.loadingImage}`}>
-                <CircularProgress thickness={5} />
-            </div>
-        );
-    }
-
-    return (
-        <img
-            className={classes.image}
-            ref={ref}
-            src={imageSrc}
-            alt={`Page #${index}`}
-        />
-    );
-}
-
-const Page = React.forwardRef((props: IProps, ref: any) => {
-    const {
-        src, index, setCurPage, settings,
-    } = props;
+        switch (settings.readerType) {
+            case 'Webtoon':
+            case 'ContinuesVertical':
+                window.addEventListener('scroll', handleVerticalScroll);
+                return () => window.removeEventListener('scroll', handleVerticalScroll);
+            case 'ContinuesHorizontalLTR':
+            case 'ContinuesHorizontalRTL':
+                window.addEventListener('scroll', handleHorizontalScroll);
+                return () => window.removeEventListener('scroll', handleHorizontalScroll);
+            default:
+                return () => {};
+        }
+    }, [handleVerticalScroll]);
 
     return (
         <div ref={ref} style={{ margin: '0 auto' }}>
-            <LazyImage
+            <SpinnerImage
                 src={src}
-                index={index}
-                setCurPage={setCurPage}
-                settings={settings}
+                onImageLoad={onImageLoad}
+                alt={`Page #${index}`}
+                imgRef={imgRef}
+                spinnerClassName={`${classes.image} ${classes.loadingImage}`}
+                imgClassName={classes.image}
             />
         </div>
     );

webUI/react/src/components/manga/reader/pager/DoublePagedPager.tsx

@@ -0,0 +1,212 @@
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+import { makeStyles } from '@material-ui/core/styles';
+import React, { useEffect, useRef } from 'react';
+import ReactDOM from 'react-dom';
+import Page from '../Page';
+import DoublePage from '../DoublePage';
+
+const useStyles = (settings: IReaderSettings) => makeStyles({
+    preload: {
+        display: 'none',
+    },
+    reader: {
+        display: 'flex',
+        flexDirection: (settings.readerType === 'DoubleLTR') ? 'row' : 'row-reverse',
+        justifyContent: 'center',
+        margin: '0 auto',
+        width: 'auto',
+        height: 'auto',
+        overflowX: 'scroll',
+    },
+});
+
+export default function DoublePagedPager(props: IReaderProps) {
+    const {
+        pages, settings, setCurPage, curPage, nextChapter, prevChapter,
+    } = props;
+
+    const classes = useStyles(settings)();
+
+    const selfRef = useRef<HTMLDivElement>(null);
+    const pagesRef = useRef<HTMLImageElement[]>([]);
+
+    const pagesDisplayed = useRef<number>(0);
+    const pageLoaded = useRef<boolean[]>(Array(pages.length).fill(false));
+
+    function setPagesToDisplay() {
+        pagesDisplayed.current = 0;
+        if (curPage < pages.length && pagesRef.current[curPage]) {
+            if (pageLoaded.current[curPage]) {
+                pagesDisplayed.current = 1;
+                const imgElem = pagesRef.current[curPage];
+                const aspectRatio = imgElem.height / imgElem.width;
+                if (aspectRatio < 1) {
+                    return;
+                }
+            }
+        }
+        if (curPage + 1 < pages.length && pagesRef.current[curPage + 1]) {
+            if (pageLoaded.current[curPage + 1]) {
+                const imgElem = pagesRef.current[curPage + 1];
+                const aspectRatio = imgElem.height / imgElem.width;
+                if (aspectRatio < 1) {
+                    return;
+                }
+                pagesDisplayed.current = 2;
+            }
+        }
+    }
+
+    function displayPages() {
+        if (pagesDisplayed.current === 2) {
+            ReactDOM.render(
+                <DoublePage
+                    key={curPage}
+                    index={curPage}
+                    image1src={pages[curPage].src}
+                    image2src={pages[curPage + 1].src}
+                    settings={settings}
+                />,
+                document.getElementById('display'),
+            );
+        } else {
+            ReactDOM.render(
+                <Page
+                    key={curPage}
+                    index={curPage}
+                    src={(pagesDisplayed.current === 1) ? pages[curPage].src : ''}
+                    onImageLoad={() => {}}
+                    setCurPage={setCurPage}
+                    settings={settings}
+                />,
+                document.getElementById('display'),
+            );
+        }
+    }
+
+    function pagesToGoBack() {
+        for (let i = 1; i <= 2; i++) {
+            if (curPage - i > 0 && pagesRef.current[curPage - i]) {
+                if (pageLoaded.current[curPage - i]) {
+                    const imgElem = pagesRef.current[curPage - i];
+                    const aspectRatio = imgElem.height / imgElem.width;
+                    if (aspectRatio < 1) {
+                        return 1;
+                    }
+                }
+            }
+        }
+        return 2;
+    }
+
+    function nextPage() {
+        if (curPage < pages.length - 1) {
+            const nextCurPage = curPage + pagesDisplayed.current;
+            setCurPage((nextCurPage >= pages.length) ? pages.length - 1 : nextCurPage);
+        } else if (settings.loadNextonEnding) {
+            nextChapter();
+        }
+    }
+
+    function prevPage() {
+        if (curPage > 0) {
+            const nextCurPage = curPage - pagesToGoBack();
+            setCurPage((nextCurPage < 0) ? 0 : nextCurPage);
+        } else {
+            prevChapter();
+        }
+    }
+
+    function goLeft() {
+        if (settings.readerType === 'DoubleLTR') {
+            prevPage();
+        } else {
+            nextPage();
+        }
+    }
+
+    function goRight() {
+        if (settings.readerType === 'DoubleLTR') {
+            nextPage();
+        } else {
+            prevPage();
+        }
+    }
+
+    function keyboardControl(e:KeyboardEvent) {
+        switch (e.code) {
+            case 'Space':
+                e.preventDefault();
+                nextPage();
+                break;
+            case 'ArrowRight':
+                goRight();
+                break;
+            case 'ArrowLeft':
+                goLeft();
+                break;
+            default:
+                break;
+        }
+    }
+
+    function clickControl(e:MouseEvent) {
+        if (e.clientX > window.innerWidth / 2) {
+            goRight();
+        } else {
+            goLeft();
+        }
+    }
+
+    function handleImageLoad(index: number) {
+        return () => {
+            pageLoaded.current[index] = true;
+        };
+    }
+
+    useEffect(() => {
+        const retryDisplay = setInterval(() => {
+            const isLastPage = (curPage === pages.length - 1);
+            if ((!isLastPage && pageLoaded.current[curPage] && pageLoaded.current[curPage + 1])
+                || pageLoaded.current[curPage]) {
+                setPagesToDisplay();
+                displayPages();
+                clearInterval(retryDisplay);
+            }
+        }, 50);
+
+        document.addEventListener('keydown', keyboardControl);
+        selfRef.current?.addEventListener('click', clickControl);
+
+        return () => {
+            clearInterval(retryDisplay);
+            document.removeEventListener('keydown', keyboardControl);
+            selfRef.current?.removeEventListener('click', clickControl);
+        };
+    }, [selfRef, curPage, settings.readerType]);
+
+    return (
+        <div ref={selfRef}>
+            <div id="preload" className={classes.preload}>
+                {
+                    pages.map((page) => (
+                        <img
+                            ref={(e:HTMLImageElement) => { pagesRef.current[page.index] = e; }}
+                            key={`${page.index}`}
+                            src={page.src}
+                            onLoad={handleImageLoad(page.index)}
+                            alt={`${page.index}`}
+                        />
+                    ))
+                }
+            </div>
+            <div id="display" className={classes.reader} />
+        </div>
+    );
+}

webUI/react/src/components/manga/reader/pager/HorizontalPager.tsx

@@ -6,42 +6,139 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
 import { makeStyles } from '@material-ui/core/styles';
-import React from 'react';
+import React, { useEffect, useRef } from 'react';
 import Page from '../Page';
 
-const useStyles = makeStyles({
+const useStyles = (settings: IReaderSettings) => makeStyles({
     reader: {
         display: 'flex',
-        flexDirection: 'row',
-        justifyContent: 'center',
+        flexDirection: (settings.readerType === 'ContinuesHorizontalLTR') ? 'row' : 'row-reverse',
+        justifyContent: (settings.readerType === 'ContinuesHorizontalLTR') ? 'flex-start' : 'flex-end',
         margin: '0 auto',
-        width: '100%',
-        height: '100vh',
-        overflowX: 'scroll',
+        width: 'auto',
+        height: 'auto',
+        overflowX: 'visible',
+        userSelect: 'none',
     },
 });
 
-interface IProps {
-    pages: Array<IReaderPage>
-    setCurPage: React.Dispatch<React.SetStateAction<number>>
-    settings: IReaderSettings
-}
+export default function HorizontalPager(props: IReaderProps) {
+    const {
+        pages, curPage, settings, setCurPage, prevChapter, nextChapter,
+    } = props;
 
-export default function HorizontalPager(props: IProps) {
-    const { pages, settings, setCurPage } = props;
+    const classes = useStyles(settings)();
 
-    const classes = useStyles();
+    const selfRef = useRef<HTMLDivElement>(null);
+    const pagesRef = useRef<HTMLDivElement[]>([]);
+
+    function nextPage() {
+        if (curPage < pages.length - 1) {
+            pagesRef.current[curPage + 1]?.scrollIntoView({ inline: 'center' });
+            setCurPage((page) => page + 1);
+        } else if (settings.loadNextonEnding) {
+            nextChapter();
+        }
+    }
+
+    function prevPage() {
+        if (curPage > 0) {
+            pagesRef.current[curPage - 1]?.scrollIntoView({ inline: 'center' });
+            setCurPage(curPage - 1);
+        } else if (curPage === 0) {
+            prevChapter();
+        }
+    }
+
+    function goLeft() {
+        if (settings.readerType === 'ContinuesHorizontalLTR') {
+            prevPage();
+        } else {
+            nextPage();
+        }
+    }
+
+    function goRight() {
+        if (settings.readerType === 'ContinuesHorizontalLTR') {
+            nextPage();
+        } else {
+            prevPage();
+        }
+    }
+
+    const mouseXPos = useRef<number>(0);
+
+    function dragScreen(e: MouseEvent) {
+        window.scrollBy(mouseXPos.current - e.pageX, 0);
+    }
+
+    function dragControl(e:MouseEvent) {
+        mouseXPos.current = e.pageX;
+        selfRef.current?.addEventListener('mousemove', dragScreen);
+    }
+
+    function removeDragControl() {
+        selfRef.current?.removeEventListener('mousemove', dragScreen);
+    }
+
+    function clickControl(e:MouseEvent) {
+        if (e.clientX >= window.innerWidth * 0.85) {
+            goRight();
+        } else if (e.clientX <= window.innerWidth * 0.15) {
+            goLeft();
+        }
+    }
+
+    const handleLoadNextonEnding = () => {
+        if (settings.readerType === 'ContinuesHorizontalLTR') {
+            if (window.scrollX + window.innerWidth >= document.body.scrollWidth) {
+                nextChapter();
+            }
+        } else if (settings.readerType === 'ContinuesHorizontalRTL') {
+            if (window.scrollX <= window.innerWidth) {
+                nextChapter();
+            }
+        }
+    };
+
+    useEffect(() => {
+        pagesRef.current[curPage]?.scrollIntoView({ inline: 'center' });
+    }, [settings.readerType]);
+
+    useEffect(() => {
+        selfRef.current?.addEventListener('mousedown', dragControl);
+        selfRef.current?.addEventListener('mouseup', removeDragControl);
+
+        return () => {
+            selfRef.current?.removeEventListener('mousedown', dragControl);
+            selfRef.current?.removeEventListener('mouseup', removeDragControl);
+        };
+    }, [selfRef]);
+
+    useEffect(() => {
+        if (settings.loadNextonEnding) {
+            document.addEventListener('scroll', handleLoadNextonEnding);
+        }
+        selfRef.current?.addEventListener('mousedown', clickControl);
+
+        return () => {
+            document.removeEventListener('scroll', handleLoadNextonEnding);
+            selfRef.current?.removeEventListener('mousedown', clickControl);
+        };
+    }, [selfRef, curPage]);
 
     return (
-        <div className={classes.reader}>
+        <div ref={selfRef} className={classes.reader}>
             {
                 pages.map((page) => (
                     <Page
                         key={page.index}
                         index={page.index}
                         src={page.src}
+                        onImageLoad={() => {}}
                         setCurPage={setCurPage}
                         settings={settings}
+                        ref={(e:HTMLDivElement) => { pagesRef.current[page.index] = e; }}
                     />
                 ))
             }

webUI/react/src/components/manga/reader/pager/PagedPager.tsx

@@ -38,7 +38,27 @@ export default function PagedReader(props: IReaderProps) {
     }
 
     function prevPage() {
-        if (curPage > 0) { setCurPage(curPage - 1); } else if (curPage === 0) { prevChapter(); }
+        if (curPage > 0) {
+            setCurPage(curPage - 1);
+        } else {
+            prevChapter();
+        }
+    }
+
+    function goLeft() {
+        if (settings.readerType === 'SingleLTR') {
+            prevPage();
+        } else if (settings.readerType === 'SingleRTL') {
+            nextPage();
+        }
+    }
+
+    function goRight() {
+        if (settings.readerType === 'SingleLTR') {
+            nextPage();
+        } else if (settings.readerType === 'SingleRTL') {
+            prevPage();
+        }
     }
 
     function keyboardControl(e:KeyboardEvent) {
@@ -48,10 +68,10 @@ export default function PagedReader(props: IReaderProps) {
                 nextPage();
                 break;
             case 'ArrowRight':
-                nextPage();
+                goRight();
                 break;
             case 'ArrowLeft':
-                prevPage();
+                goLeft();
                 break;
             default:
                 break;
@@ -60,9 +80,9 @@ export default function PagedReader(props: IReaderProps) {
 
     function clickControl(e:MouseEvent) {
         if (e.clientX > window.innerWidth / 2) {
-            nextPage();
+            goRight();
         } else {
-            prevPage();
+            goLeft();
         }
     }
 
@@ -74,13 +94,14 @@ export default function PagedReader(props: IReaderProps) {
             document.removeEventListener('keydown', keyboardControl);
             selfRef.current?.removeEventListener('click', clickControl);
         };
-    }, [selfRef, curPage]);
+    }, [selfRef, curPage, settings.readerType]);
 
     return (
         <div ref={selfRef} className={classes.reader}>
             <Page
                 key={curPage}
                 index={curPage}
+                onImageLoad={() => {}}
                 src={pages[curPage].src}
                 setCurPage={setCurPage}
                 settings={settings}

webUI/react/src/components/manga/reader/pager/VerticalPager.tsx

@@ -29,6 +29,10 @@ export default function VerticalReader(props: IReaderProps) {
     const selfRef = useRef<HTMLDivElement>(null);
     const pagesRef = useRef<HTMLDivElement[]>([]);
 
+    useEffect(() => {
+        pagesRef.current = pagesRef.current.slice(0, pages.length);
+    }, [pages.length]);
+
     function nextPage() {
         if (curPage < pages.length - 1) {
             pagesRef.current[curPage + 1]?.scrollIntoView();
@@ -104,7 +108,7 @@ export default function VerticalReader(props: IReaderProps) {
         if (initialPage > -1) {
             pagesRef.current[initialPage].scrollIntoView();
         }
-    }, []);
+    }, [pagesRef.current.length]);
 
     return (
         <div ref={selfRef} className={classes.reader}>
@@ -114,6 +118,7 @@ export default function VerticalReader(props: IReaderProps) {
                         key={page.index}
                         index={page.index}
                         src={page.src}
+                        onImageLoad={() => {}}
                         setCurPage={setCurPage}
                         settings={settings}
                         ref={(e:HTMLDivElement) => { pagesRef.current[page.index] = e; }}

webUI/react/src/components/navbar/ReaderNavBar.tsx

@@ -286,17 +286,25 @@ export default function ReaderNavBar(props: IProps) {
                                     onChange={(e) => setSettingValue('readerType', e.target.value)}
                                 >
                                     <MenuItem value="SingleLTR">
-                                        Left to right
+                                        Single Page (LTR)
 
                                     </MenuItem>
-                                    {/* <MenuItem value="SingleRTL">
-                                        Right to left(WIP)
+                                    <MenuItem value="SingleRTL">
+                                        Single Page (RTL)
 
-                                    </MenuItem> */}
+                                    </MenuItem>
                                     {/* <MenuItem value="SingleVertical">
                                         Vertical(WIP)
 
                                     </MenuItem> */}
+                                    <MenuItem value="DoubleLTR">
+                                        Double Page (LTR)
+
+                                    </MenuItem>
+                                    <MenuItem value="DoubleRTL">
+                                        Double Page (RTL)
+
+                                    </MenuItem>
                                     <MenuItem value="Webtoon">
                                         Webtoon
 
@@ -305,10 +313,14 @@ export default function ReaderNavBar(props: IProps) {
                                         Continues Vertical
 
                                     </MenuItem>
-                                    {/* <MenuItem value="ContinuesHorizontal">
-                                        Horizontal(WIP)
+                                    <MenuItem value="ContinuesHorizontalLTR">
+                                        Horizontal (LTR)
 
-                                    </MenuItem> */}
+                                    </MenuItem>
+                                    <MenuItem value="ContinuesHorizontalRTL">
+                                        Horizontal (RTL)
+
+                                    </MenuItem>
                                 </Select>
                             </ListItem>
                         </List>

webUI/react/src/screens/manga/DownloadQueue.tsx

@@ -0,0 +1,153 @@
+/* eslint-disable @typescript-eslint/no-shadow */
+/* eslint-disable react/destructuring-assignment */
+/* eslint-disable react/jsx-props-no-spreading */
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+import NavbarContext from 'context/NavbarContext';
+import React, { useContext, useEffect, useState } from 'react';
+import PlayArrowIcon from '@material-ui/icons/PlayArrow';
+import PauseIcon from '@material-ui/icons/Pause';
+import IconButton from '@material-ui/core/IconButton';
+import client from 'util/client';
+import {
+    DragDropContext, Draggable, DraggingStyle, Droppable, DropResult, NotDraggingStyle,
+} from 'react-beautiful-dnd';
+import { useTheme } from '@material-ui/core/styles';
+import { Palette } from '@material-ui/core/styles/createPalette';
+import List from '@material-ui/core/List';
+import DragHandleIcon from '@material-ui/icons/DragHandle';
+import ListItem from '@material-ui/core/ListItem';
+import { ListItemIcon } from '@material-ui/core';
+import ListItemText from '@material-ui/core/ListItemText';
+
+const baseWebsocketUrl = JSON.parse(window.localStorage.getItem('serverBaseURL')!).replace('http', 'ws');
+
+const getItemStyle = (isDragging: boolean,
+    draggableStyle: DraggingStyle | NotDraggingStyle | undefined, palette: Palette) => ({
+    // styles we need to apply on draggables
+    ...draggableStyle,
+
+    ...(isDragging && {
+        background: palette.type === 'dark' ? '#424242' : 'rgb(235,235,235)',
+    }),
+});
+
+const initialQueue = {
+    status: 'Stopped',
+    queue: [],
+} as IQueue;
+
+export default function DownloadQueue() {
+    const [, setWsClient] = useState<WebSocket>();
+    const [queueState, setQueueState] = useState<IQueue>(initialQueue);
+    const { queue, status } = queueState;
+
+    const theme = useTheme();
+
+    const { setTitle, setAction } = useContext(NavbarContext);
+
+    const toggleQueueStatus = () => {
+        if (status === 'Stopped') {
+            client.get('/api/v1/downloads/start');
+        } else {
+            client.get('/api/v1/downloads/stop');
+        }
+    };
+
+    useEffect(() => {
+        setTitle('Download Queue');
+
+        setAction(() => {
+            if (status === 'Stopped') {
+                return (
+                    <IconButton onClick={toggleQueueStatus}>
+                        <PlayArrowIcon />
+                    </IconButton>
+                );
+            }
+            return (
+                <IconButton onClick={toggleQueueStatus}>
+                    <PauseIcon />
+                </IconButton>
+            );
+        });
+    }, [status]);
+
+    useEffect(() => {
+        const wsc = new WebSocket(`${baseWebsocketUrl}/api/v1/downloads`);
+        wsc.onmessage = (e) => {
+            setQueueState(JSON.parse(e.data));
+        };
+
+        setWsClient(wsc);
+    }, []);
+
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    const onDragEnd = (result: DropResult) => {
+    };
+
+    return (
+        <>
+            <DragDropContext onDragEnd={onDragEnd}>
+                <Droppable droppableId="droppable">
+                    {(provided) => (
+                        <List ref={provided.innerRef}>
+                            {queue.map((item, index) => (
+                                <Draggable
+                                    key={`${item.mangaId}-${item.chapterIndex}`}
+                                    draggableId={`${item.mangaId}-${item.chapterIndex}`}
+                                    index={index}
+                                >
+                                    {(provided, snapshot) => (
+                                        <ListItem
+                                            ContainerProps={{ ref: provided.innerRef } as any}
+                                            {...provided.draggableProps}
+                                            {...provided.dragHandleProps}
+                                            style={getItemStyle(
+                                                snapshot.isDragging,
+                                                provided.draggableProps.style,
+                                                theme.palette,
+                                            )}
+                                            ref={provided.innerRef}
+                                        >
+                                            <ListItemIcon>
+                                                <DragHandleIcon />
+                                            </ListItemIcon>
+                                            <ListItemText
+                                                primary={
+                                                    `${item.chapter.name} | `
+                                                    + ` (${item.progress * 100}%)`
+                                                    + ` => state: ${item.state}`
+                                                }
+                                            />
+                                            {/* <IconButton
+                                                onClick={() => {
+                                                    handleEditDialogOpen(index);
+                                                }}
+                                            >
+                                                <EditIcon />
+                                            </IconButton>
+                                            <IconButton
+                                                onClick={() => {
+                                                    deleteCategory(index);
+                                                }}
+                                            >
+                                                <DeleteIcon />
+                                            </IconButton> */}
+                                        </ListItem>
+                                    )}
+                                </Draggable>
+                            ))}
+                            {provided.placeholder}
+                        </List>
+                    )}
+                </Droppable>
+            </DragDropContext>
+        </>
+    );
+}

webUI/react/src/screens/manga/Manga.tsx

@@ -41,6 +41,12 @@ const useStyles = makeStyles((theme: Theme) => ({
     },
 }));
 
+const baseWebsocketUrl = JSON.parse(window.localStorage.getItem('serverBaseURL')!).replace('http', 'ws');
+const initialQueue = {
+    status: 'Stopped',
+    queue: [],
+} as IQueue;
+
 export default function Manga() {
     const classes = useStyles();
 
@@ -55,10 +61,48 @@ export default function Manga() {
     const [noChaptersFound, setNoChaptersFound] = useState(false);
     const [chapterUpdateTriggerer, setChapterUpdateTriggerer] = useState(0);
 
+    const [, setWsClient] = useState<WebSocket>();
+    const [{ queue }, setQueueState] = useState<IQueue>(initialQueue);
+
     function triggerChaptersUpdate() {
         setChapterUpdateTriggerer(chapterUpdateTriggerer + 1);
     }
 
+    useEffect(() => {
+        const wsc = new WebSocket(`${baseWebsocketUrl}/api/v1/downloads`);
+        wsc.onmessage = (e) => {
+            const data = JSON.parse(e.data) as IQueue;
+            setQueueState(data);
+
+            let shouldUpdate = false;
+            data.queue.forEach((q) => {
+                if (q.mangaId === manga?.id && q.state === 'Finished') {
+                    shouldUpdate = true;
+                }
+            });
+            if (shouldUpdate) {
+                triggerChaptersUpdate();
+            }
+        };
+
+        setWsClient(wsc);
+
+        return () => wsc.close();
+    }, [queue.length]);
+
+    const downloadingStringFor = (chapter: IChapter) => {
+        let rtn = '';
+        if (chapter.downloaded) {
+            rtn = ' • Downloaded';
+        }
+        queue.forEach((q) => {
+            if (chapter.index === q.chapterIndex && chapter.mangaId === q.mangaId) {
+                rtn = ` • Downloading (${q.progress * 100}%)`;
+            }
+        });
+        return rtn;
+    };
+
     useEffect(() => {
         if (manga === undefined || !manga.freshData) {
             client.get(`/api/v1/manga/${id}/?onlineFetch=${manga !== undefined}`)
@@ -105,6 +149,7 @@ export default function Manga() {
                     itemContent={(index:number) => (
                         <ChapterCard
                             chapter={chapters[index]}
+                            downloadingString={downloadingStringFor(chapters[index])}
                             triggerChaptersUpdate={triggerChaptersUpdate}
                         />
                     )}

webUI/react/src/screens/manga/Reader.tsx

@@ -11,7 +11,8 @@ import React, { useContext, useEffect, useState } from 'react';
 import { useHistory, useParams } from 'react-router-dom';
 import HorizontalPager from 'components/manga/reader/pager/HorizontalPager';
 import PageNumber from 'components/manga/reader/PageNumber';
-import WebtoonPager from 'components/manga/reader/pager/PagedPager';
+import PagedPager from 'components/manga/reader/pager/PagedPager';
+import DoublePagedPager from 'components/manga/reader/pager/DoublePagedPager';
 import VerticalPager from 'components/manga/reader/pager/VerticalPager';
 import ReaderNavBar, { defaultReaderSettings } from 'components/navbar/ReaderNavBar';
 import NavbarContext from 'context/NavbarContext';
@@ -32,21 +33,21 @@ const useStyles = (settings: IReaderSettings) => makeStyles({
 const getReaderComponent = (readerType: ReaderType) => {
     switch (readerType) {
         case 'ContinuesVertical':
-            return VerticalPager;
-            break;
         case 'Webtoon':
             return VerticalPager;
             break;
         case 'SingleVertical':
-            return WebtoonPager;
-            break;
         case 'SingleRTL':
-            return WebtoonPager;
-            break;
         case 'SingleLTR':
-            return WebtoonPager;
+            return PagedPager;
             break;
-        case 'ContinuesHorizontal':
+        case 'DoubleVertical':
+        case 'DoubleRTL':
+        case 'DoubleLTR':
+            return DoublePagedPager;
+            break;
+        case 'ContinuesHorizontalLTR':
+        case 'ContinuesHorizontalRTL':
             return HorizontalPager;
         default:
             return VerticalPager;

webUI/react/src/screens/settings/Categories.tsx

@@ -1,3 +1,6 @@
+/* eslint-disable @typescript-eslint/no-shadow */
+/* eslint-disable react/destructuring-assignment */
+/* eslint-disable react/jsx-props-no-spreading */
 /*
  * Copyright (C) Contributors to the Suwayomi project
  *
@@ -5,9 +8,6 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-/* eslint-disable @typescript-eslint/no-shadow */
-/* eslint-disable react/destructuring-assignment */
-/* eslint-disable react/jsx-props-no-spreading */
 import React, { useState, useContext, useEffect } from 'react';
 import {
     List,
@@ -16,7 +16,9 @@ import {
     ListItemIcon,
     IconButton,
 } from '@material-ui/core';
-import { DragDropContext, Droppable, Draggable } from 'react-beautiful-dnd';
+import {
+    DragDropContext, Droppable, Draggable, DropResult, DraggingStyle, NotDraggingStyle,
+} from 'react-beautiful-dnd';
 import DragHandleIcon from '@material-ui/icons/DragHandle';
 import EditIcon from '@material-ui/icons/Edit';
 import { useTheme } from '@material-ui/core/styles';
@@ -31,10 +33,12 @@ import DialogContent from '@material-ui/core/DialogContent';
 import DialogTitle from '@material-ui/core/DialogTitle';
 import Checkbox from '@material-ui/core/Checkbox';
 import FormControlLabel from '@material-ui/core/FormControlLabel';
-import NavbarContext from '../../context/NavbarContext';
-import client from '../../util/client';
+import NavbarContext from 'context/NavbarContext';
+import client from 'util/client';
+import { Palette } from '@material-ui/core/styles/createPalette';
 
-const getItemStyle = (isDragging, draggableStyle, palette) => ({
+const getItemStyle = (isDragging: boolean,
+    draggableStyle: DraggingStyle | NotDraggingStyle | undefined, palette: Palette) => ({
     // styles we need to apply on draggables
     ...draggableStyle,
 
@@ -47,14 +51,14 @@ export default function Categories() {
     const { setTitle, setAction } = useContext(NavbarContext);
     useEffect(() => { setTitle('Categories'); setAction(<></>); }, []);
 
-    const [categories, setCategories] = useState([]);
-    const [categoryToEdit, setCategoryToEdit] = useState(-1); // -1 means new category
-    const [dialogOpen, setDialogOpen] = useState(false);
-    const [dialogName, setDialogName] = useState('');
-    const [dialogDefault, setDialogDefault] = useState(false);
+    const [categories, setCategories] = useState<ICategory[]>([]);
+    const [categoryToEdit, setCategoryToEdit] = useState<number>(-1); // -1 means new category
+    const [dialogOpen, setDialogOpen] = useState<boolean>(false);
+    const [dialogName, setDialogName] = useState<string>('');
+    const [dialogDefault, setDialogDefault] = useState<boolean>(false);
     const theme = useTheme();
 
-    const [updateTriggerHolder, setUpdateTriggerHolder] = useState(0); // just a hack
+    const [updateTriggerHolder, setUpdateTriggerHolder] = useState<number>(0); // just a hack
     const triggerUpdate = () => setUpdateTriggerHolder(updateTriggerHolder + 1); // just a hack
 
     useEffect(() => {
@@ -65,12 +69,12 @@ export default function Categories() {
         }
     }, [updateTriggerHolder]);
 
-    const categoryReorder = (list, from, to) => {
+    const categoryReorder = (list: ICategory[], from: number, to: number) => {
         const category = list[from];
 
         const formData = new FormData();
-        formData.append('from', from + 1);
-        formData.append('to', to + 1);
+        formData.append('from', `${from + 1}`);
+        formData.append('to', `${to + 1}`);
         client.post(`/api/v1/category/${category.id}/reorder`, formData)
             .finally(() => triggerUpdate());
 
@@ -81,7 +85,7 @@ export default function Categories() {
         return result;
     };
 
-    const onDragEnd = (result) => {
+    const onDragEnd = (result: DropResult) => {
         // dropped outside the list?
         if (!result.destination) {
             return;
@@ -105,7 +109,7 @@ export default function Categories() {
         setDialogOpen(true);
     };
 
-    const handleEditDialogOpen = (index) => {
+    const handleEditDialogOpen = (index:number) => {
         setDialogName(categories[index].name);
         setDialogDefault(categories[index].default);
         setCategoryToEdit(index);
@@ -121,7 +125,7 @@ export default function Categories() {
 
         const formData = new FormData();
         formData.append('name', dialogName);
-        formData.append('default', dialogDefault);
+        formData.append('default', dialogDefault.toString());
 
         if (categoryToEdit === -1) {
             client.post('/api/v1/category/', formData)
@@ -133,7 +137,7 @@ export default function Categories() {
         }
     };
 
-    const deleteCategory = (index) => {
+    const deleteCategory = (index:number) => {
         const category = categories[index];
         client.delete(`/api/v1/category/${category.id}`)
             .finally(() => triggerUpdate());
@@ -153,8 +157,7 @@ export default function Categories() {
                                 >
                                     {(provided, snapshot) => (
                                         <ListItem
-                                            ContainerComponent="li"
-                                            ContainerProps={{ ref: provided.innerRef }}
+                                            ContainerProps={{ ref: provided.innerRef } as any}
                                             {...provided.draggableProps}
                                             {...provided.dragHandleProps}
                                             style={getItemStyle(

webUI/react/src/typings.d.ts

@@ -67,6 +67,7 @@ interface IChapter {
     index: number
     chapterCount: number
     pageCount: number
+    downloaded: boolean
 }
 
 interface IEpisode {
@@ -99,7 +100,7 @@ interface IPartialEpisode {
 interface ICategory {
     id: number
     order: number
-    name: String
+    name: string
     default: boolean
 }
 
@@ -114,7 +115,11 @@ type ReaderType =
 'SingleVertical' |
 'SingleRTL' |
 'SingleLTR' |
-'ContinuesHorizontal';
+'DoubleVertical' |
+'DoubleRTL' |
+'DoubleLTR' |
+'ContinuesHorizontalLTR'|
+'ContinuesHorizontalRTL';
 
 interface IReaderSettings{
     staticNav: boolean
@@ -149,3 +154,16 @@ interface IAbout {
     github: string
     discord: string
 }
+
+interface IDownloadChapter{
+    chapterIndex: number
+    mangaId: number
+    state: 'Queued' | 'Downloading' | 'Finished' | 'Error'
+    progress: number
+    chapter: IChapter
+}
+
+interface IQueue {
+    status: 'Stopped' | 'Started'
+    queue: IDownloadChapter[]
+}

webUI/react/yarn.lock

@@ -1891,6 +1891,13 @@
   resolved "https://registry.yarnpkg.com/@types/q/-/q-1.5.4.tgz#15925414e0ad2cd765bfef58842f7e26a7accb24"
   integrity sha512-1HcDas8SEj4z1Wc696tH56G8OlRaH/sqZOynNNB+HF0WOeXPaxTtbYzJY2oEfiUxjSKjhCKr+MvR7dCHcEelug==
 
+"@types/react-beautiful-dnd@^13.0.0":
+  version "13.0.0"
+  resolved "https://registry.yarnpkg.com/@types/react-beautiful-dnd/-/react-beautiful-dnd-13.0.0.tgz#e60d3d965312fcf1516894af92dc3e9249587db4"
+  integrity sha512-by80tJ8aTTDXT256Gl+RfLRtFjYbUWOnZuEigJgNsJrSEGxvFe5eY6k3g4VIvf0M/6+xoLgfYWoWonlOo6Wqdg==
+  dependencies:
+    "@types/react" "*"
+
 "@types/react-dom@^17.0.2":
   version "17.0.5"
   resolved "https://registry.yarnpkg.com/@types/react-dom/-/react-dom-17.0.5.tgz#df44eed5b8d9e0b13bb0cd38e0ea6572a1231227"