Don't rely on cache when deleting empty manga folders

In case the cache hasn't actually been indexed yet. Maybe fixes #8438.

app/src/main/java/eu/kanade/tachiyomi/data/download/DownloadCache.kt

@@ -214,12 +214,8 @@ class DownloadCache(
     }
 
     @Synchronized
-    fun removeSourceIfEmpty(source: Source) {
-        val sourceDir = provider.findSourceDir(source)
-        if (sourceDir?.listFiles()?.isEmpty() == true) {
-            sourceDir.delete()
-            rootDownloadsDir.sourceDirs -= source.id
-        }
+    fun removeSource(source: Source) {
+        rootDownloadsDir.sourceDirs -= source.id
 
         notifyChanges()
     }

app/src/main/java/eu/kanade/tachiyomi/data/download/DownloadManager.kt

@@ -247,21 +247,27 @@ class DownloadManager(
             getChaptersToDelete(chapters, manga)
         }
 
-        launchIO {
-            removeFromDownloadQueue(filteredChapters)
-
-            val chapterDirs = provider.findChapterDirs(filteredChapters, manga, source)
-            chapterDirs.forEach { it.delete() }
-            cache.removeChapters(filteredChapters, manga)
-
-            // Delete manga directory if empty
-            if (cache.getDownloadCount(manga) == 0) {
-                chapterDirs.firstOrNull()?.parentFile?.delete()
-                cache.removeManga(manga)
+        if (filteredChapters.isNotEmpty()) {
+            launchIO {
+                removeFromDownloadQueue(filteredChapters)
+
+                val (mangaDir, chapterDirs) = provider.findChapterDirs(filteredChapters, manga, source)
+                chapterDirs.forEach { it.delete() }
+                cache.removeChapters(filteredChapters, manga)
+
+                // Delete manga directory if empty
+                if (mangaDir?.listFiles()?.isEmpty() == true) {
+                    mangaDir.delete()
+                    cache.removeManga(manga)
+
+                    // Delete source directory if empty
+                    val sourceDir = provider.findSourceDir(source)
+                    if (sourceDir?.listFiles()?.isEmpty() == true) {
+                        sourceDir.delete()
+                        cache.removeSource(source)
+                    }
+                }
             }
-
-            // Delete source directory if empty
-            cache.removeSourceIfEmpty(source)
         }
 
         return filteredChapters
@@ -334,13 +340,13 @@ class DownloadManager(
         if (capitalizationChanged) {
             val tempName = newName + "_tmp"
             if (oldFolder.renameTo(tempName).not()) {
-                logcat(LogPriority.ERROR) { "Could not rename source download folder: ${oldFolder.name}." }
+                logcat(LogPriority.ERROR) { "Failed to rename source download folder: ${oldFolder.name}." }
                 return
             }
         }
 
         if (oldFolder.renameTo(newName).not()) {
-            logcat(LogPriority.ERROR) { "Could not rename source download folder: ${oldFolder.name}." }
+            logcat(LogPriority.ERROR) { "Failed to rename source download folder: ${oldFolder.name}." }
         }
     }
 

app/src/main/java/eu/kanade/tachiyomi/data/download/DownloadPendingDeleter.kt

@@ -8,16 +8,18 @@ import kotlinx.serialization.Serializable
 import kotlinx.serialization.decodeFromString
 import kotlinx.serialization.encodeToString
 import kotlinx.serialization.json.Json
-import uy.kohesive.injekt.injectLazy
+import uy.kohesive.injekt.Injekt
+import uy.kohesive.injekt.api.get
 
 /**
  * Class used to keep a list of chapters for future deletion.
  *
  * @param context the application context.
  */
-class DownloadPendingDeleter(context: Context) {
-
-    private val json: Json by injectLazy()
+class DownloadPendingDeleter(
+    context: Context,
+    private val json: Json = Injekt.get(),
+) {
 
     /**
      * Preferences used to store the list of chapters to delete.
@@ -120,6 +122,36 @@ class DownloadPendingDeleter(context: Context) {
         return newList
     }
 
+    /**
+     * Returns a manga entry from a manga model.
+     */
+    private fun Manga.toEntry() = MangaEntry(id, url, title, source)
+
+    /**
+     * Returns a chapter entry from a chapter model.
+     */
+    private fun Chapter.toEntry() = ChapterEntry(id, url, name, scanlator)
+
+    /**
+     * Returns a manga model from a manga entry.
+     */
+    private fun MangaEntry.toModel() = Manga.create().copy(
+        url = url,
+        title = title,
+        source = source,
+        id = id,
+    )
+
+    /**
+     * Returns a chapter model from a chapter entry.
+     */
+    private fun ChapterEntry.toModel() = Chapter.create().copy(
+        id = id,
+        url = url,
+        name = name,
+        scanlator = scanlator,
+    )
+
     /**
      * Class used to save an entry of chapters with their manga into preferences.
      */
@@ -150,42 +182,4 @@ class DownloadPendingDeleter(context: Context) {
         val title: String,
         val source: Long,
     )
-
-    /**
-     * Returns a manga entry from a manga model.
-     */
-    private fun Manga.toEntry(): MangaEntry {
-        return MangaEntry(id, url, title, source)
-    }
-
-    /**
-     * Returns a chapter entry from a chapter model.
-     */
-    private fun Chapter.toEntry(): ChapterEntry {
-        return ChapterEntry(id!!, url, name, scanlator)
-    }
-
-    /**
-     * Returns a manga model from a manga entry.
-     */
-    private fun MangaEntry.toModel(): Manga {
-        return Manga.create().copy(
-            url = url,
-            title = title,
-            source = source,
-            id = id,
-        )
-    }
-
-    /**
-     * Returns a chapter model from a chapter entry.
-     */
-    private fun ChapterEntry.toModel(): Chapter {
-        return Chapter.create().copy(
-            id = id,
-            url = url,
-            name = name,
-            scanlator = scanlator,
-        )
-    }
 }

app/src/main/java/eu/kanade/tachiyomi/data/download/DownloadProvider.kt

@@ -104,9 +104,9 @@ class DownloadProvider(
      * @param manga the manga of the chapter.
      * @param source the source of the chapter.
      */
-    fun findChapterDirs(chapters: List<Chapter>, manga: Manga, source: Source): List<UniFile> {
-        val mangaDir = findMangaDir(manga.title, source) ?: return emptyList()
-        return chapters.mapNotNull { chapter ->
+    fun findChapterDirs(chapters: List<Chapter>, manga: Manga, source: Source): Pair<UniFile?, List<UniFile>> {
+        val mangaDir = findMangaDir(manga.title, source) ?: return null to emptyList()
+        return mangaDir to chapters.mapNotNull { chapter ->
             getValidChapterDirNames(chapter.name, chapter.scanlator).asSequence()
                 .mapNotNull { mangaDir.findFile(it) }
                 .firstOrNull()