Ask for chapter deletion when removing from library

app/src/main/java/eu/kanade/tachiyomi/ui/manga/info/MangaInfoFragment.kt

@@ -20,6 +20,7 @@ import eu.kanade.tachiyomi.source.online.HttpSource
 import eu.kanade.tachiyomi.ui.base.fragment.BaseRxFragment
 import eu.kanade.tachiyomi.ui.manga.MangaActivity
 import eu.kanade.tachiyomi.util.getResourceColor
+import eu.kanade.tachiyomi.util.snack
 import eu.kanade.tachiyomi.util.toast
 import jp.wasabeef.glide.transformations.CropCircleTransformation
 import jp.wasabeef.glide.transformations.CropSquareTransformation
@@ -62,7 +63,7 @@ class MangaInfoFragment : BaseRxFragment<MangaInfoPresenter>() {
 
     override fun onViewCreated(view: View?, savedState: Bundle?) {
         // Set onclickListener to toggle favorite when FAB clicked.
-        fab_favorite.setOnClickListener { presenter.toggleFavorite() }
+        fab_favorite.setOnClickListener { toggleFavorite() }
 
         // Set SwipeRefresh to refresh manga data.
         swipe_refresh.setOnRefreshListener { fetchMangaFromSource() }
@@ -160,13 +161,31 @@ class MangaInfoFragment : BaseRxFragment<MangaInfoPresenter>() {
         manga_chapters.text = count.toString()
     }
 
+    /**
+     * Toggles the favorite status and asks for confirmation to delete downloaded chapters.
+     */
+    fun toggleFavorite() {
+        if (!isAdded) return
+
+        val isNowFavorite = presenter.toggleFavorite()
+        if (!isNowFavorite && presenter.hasDownloads()) {
+            view!!.snack(getString(R.string.delete_downloads_for_manga)) {
+                setAction(R.string.action_delete) {
+                    presenter.deleteDownloads()
+                }
+            }
+        }
+    }
+
     /**
      * Open the manga in browser.
      */
     fun openInBrowser() {
+        if (!isAdded) return
+
         val source = presenter.source as? HttpSource ?: return
         try {
-            val url = Uri.parse(source.baseUrl + presenter.manga.url)
+            val url = Uri.parse(source.mangaDetailsRequest(presenter.manga).url().toString())
             val intent = CustomTabsIntent.Builder()
                     .setToolbarColor(context.getResourceColor(R.attr.colorPrimary))
                     .build()
@@ -180,14 +199,16 @@ class MangaInfoFragment : BaseRxFragment<MangaInfoPresenter>() {
      * Called to run Intent with [Intent.ACTION_SEND], which show share dialog.
      */
     private fun shareManga() {
+        if (!isAdded) return
+
         val source = presenter.source as? HttpSource ?: return
         try {
             val url = source.mangaDetailsRequest(presenter.manga).url().toString()
             val sharingIntent = Intent(Intent.ACTION_SEND).apply {
                 type = "text/plain"
-                putExtra(android.content.Intent.EXTRA_TEXT, resources.getString(R.string.share_text, presenter.manga.title, url))
+                putExtra(Intent.EXTRA_TEXT, getString(R.string.share_text, presenter.manga.title, url))
             }
-            startActivity(Intent.createChooser(sharingIntent, resources.getText(R.string.action_share)))
+            startActivity(Intent.createChooser(sharingIntent, getString(R.string.action_share)))
         } catch (e: Exception) {
             context.toast(e.message)
         }
@@ -197,6 +218,8 @@ class MangaInfoFragment : BaseRxFragment<MangaInfoPresenter>() {
      * Add the manga to the home screen
      */
     fun addToHomeScreen() {
+        if (!isAdded) return
+
         val shortcutIntent = activity.intent
         shortcutIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
                 .putExtra(MangaActivity.FROM_LAUNCHER_EXTRA, true)

app/src/main/java/eu/kanade/tachiyomi/ui/manga/info/MangaInfoPresenter.kt

@@ -4,6 +4,7 @@ import android.os.Bundle
 import eu.kanade.tachiyomi.data.cache.CoverCache
 import eu.kanade.tachiyomi.data.database.DatabaseHelper
 import eu.kanade.tachiyomi.data.database.models.Manga
+import eu.kanade.tachiyomi.data.download.DownloadManager
 import eu.kanade.tachiyomi.source.Source
 import eu.kanade.tachiyomi.source.SourceManager
 import eu.kanade.tachiyomi.ui.base.presenter.BasePresenter
@@ -50,6 +51,8 @@ class MangaInfoPresenter : BasePresenter<MangaInfoFragment>() {
      */
     val coverCache: CoverCache by injectLazy()
 
+    private val downloadManager: DownloadManager by injectLazy()
+
     /**
      * Subscription to send the manga to the view.
      */
@@ -75,7 +78,7 @@ class MangaInfoPresenter : BasePresenter<MangaInfoFragment>() {
         // Update favorite status
         SharedData.get(MangaFavoriteEvent::class.java)?.observable
                 ?.observeOn(AndroidSchedulers.mainThread())
-                ?.subscribe{setFavorite(it)}
+                ?.subscribe { setFavorite(it) }
     }
 
     /**
@@ -111,14 +114,17 @@ class MangaInfoPresenter : BasePresenter<MangaInfoFragment>() {
 
     /**
      * Update favorite status of manga, (removes / adds) manga (to / from) library.
+     *
+     * @return the new status of the manga.
      */
-    fun toggleFavorite() {
+    fun toggleFavorite(): Boolean {
         manga.favorite = !manga.favorite
         if (!manga.favorite) {
             coverCache.deleteFromCache(manga.thumbnail_url)
         }
         db.insertManga(manga).executeAsBlocking()
         sendMangaToView()
+        return manga.favorite
     }
 
     private fun setFavorite(favorite: Boolean) {
@@ -128,4 +134,18 @@ class MangaInfoPresenter : BasePresenter<MangaInfoFragment>() {
         toggleFavorite()
     }
 
+    /**
+     * Returns true if the manga has any downloads.
+     */
+    fun hasDownloads(): Boolean {
+        return downloadManager.findMangaDir(source, manga) != null
+    }
+
+    /**
+     * Deletes all the downloads for the manga.
+     */
+    fun deleteDownloads() {
+        downloadManager.findMangaDir(source, manga)?.delete()
+    }
+
 }