Change return value of `SyncChaptersWithSource.await()` (#7715)

* Change return value of `SyncChaptersWithSource.await()`

`updatedToAdd.subtract(reAdded).toList()` never worked as at this point `updatedToAdd` contained ids from db where `reAdded` had default one. Was the same case before the rewrite.

Removed `toDelete` from return value as it was not being used anywhere

* Add doc string

* Use HashSet

Co-authored-by: stevenyomi <[email protected]>

Co-authored-by: stevenyomi <[email protected]>

app/src/main/java/eu/kanade/domain/chapter/interactor/SyncChaptersWithSource.kt

@@ -28,11 +28,19 @@ class SyncChaptersWithSource(
     private val getChapterByMangaId: GetChapterByMangaId = Injekt.get(),
 ) {
 
+    /**
+     * Method to synchronize db chapters with source ones
+     *
+     * @param rawSourceChapters the chapters from the source.
+     * @param manga the manga the chapters belong to.
+     * @param source the source the manga belongs to.
+     * @return Newly added chapters
+     */
     suspend fun await(
         rawSourceChapters: List<SChapter>,
         manga: Manga,
         source: Source,
-    ): Pair<List<Chapter>, List<Chapter>> {
+    ): List<Chapter> {
         if (rawSourceChapters.isEmpty() && source.id != LocalSource.ID) {
             throw NoChaptersException()
         }
@@ -114,7 +122,7 @@ class SyncChaptersWithSource(
 
         // Return if there's nothing to add, delete or change, avoiding unnecessary db transactions.
         if (toAdd.isEmpty() && toDelete.isEmpty() && toChange.isEmpty()) {
-            return Pair(emptyList(), emptyList())
+            return emptyList()
         }
 
         val reAdded = mutableListOf<Chapter>()
@@ -174,7 +182,8 @@ class SyncChaptersWithSource(
         // Note that last_update actually represents last time the chapter list changed at all
         updateManga.awaitUpdateLastUpdate(manga.id)
 
-        @Suppress("ConvertArgumentToSet") // See tachiyomiorg/tachiyomi#6372.
-        return Pair(updatedToAdd.subtract(reAdded).toList(), toDelete.subtract(reAdded).toList())
+        val reAddedUrls = reAdded.map { it.url }.toHashSet()
+
+        return updatedToAdd.filterNot { it.url in reAddedUrls }
     }
 }

app/src/main/java/eu/kanade/tachiyomi/data/library/LibraryUpdateService.kt

@@ -350,7 +350,7 @@ class LibraryUpdateService(
                                             else -> {
                                                 // Convert to the manga that contains new chapters
                                                 mangaWithNotif.toDomainManga()?.let { domainManga ->
-                                                    val (newChapters, _) = updateManga(domainManga)
+                                                    val newChapters = updateManga(domainManga)
                                                     val newDbChapters = newChapters.map { it.toDbChapter() }
 
                                                     if (newChapters.isNotEmpty()) {
@@ -428,7 +428,7 @@ class LibraryUpdateService(
      * @param manga the manga to update.
      * @return a pair of the inserted and removed chapters.
      */
-    private suspend fun updateManga(manga: DomainManga): Pair<List<DomainChapter>, List<DomainChapter>> {
+    private suspend fun updateManga(manga: DomainManga): List<DomainChapter> {
         val source = sourceManager.getOrStub(manga.source)
 
         val mangaInfo: MangaInfo = manga.toMangaInfo()
@@ -444,7 +444,7 @@ class LibraryUpdateService(
 
         // Get manga from database to account for if it was removed during the update
         val dbManga = getManga.await(manga.id)
-            ?: return Pair(emptyList(), emptyList())
+            ?: return emptyList()
 
         // [dbmanga] was used so that manga data doesn't get overwritten
         // in case manga gets new chapter

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

@@ -521,7 +521,7 @@ class MangaPresenter(
                     val chapters = successState.source.getChapterList(successState.manga.toMangaInfo())
                         .map { it.toSChapter() }
 
-                    val (newChapters, _) = syncChaptersWithSource.await(
+                    val newChapters = syncChaptersWithSource.await(
                         chapters,
                         successState.manga,
                         successState.source,