More refactoring + more bug fixes

Such as when a manga picked has 0 chapters

app/src/main/java/eu/kanade/tachiyomi/ui/migration/manga/process/MigratingManga.kt

@@ -21,6 +21,8 @@ class MigratingManga(private val db: DatabaseHelper,
 
     val migrationJob = parentContext + SupervisorJob() + Dispatchers.Default
 
+    var migrationStatus:Int = MigrationStatus.RUNNUNG
+
     @Volatile
     private var manga: Manga? = null
     suspend fun manga(): Manga? {
@@ -37,3 +39,11 @@ class MigratingManga(private val db: DatabaseHelper,
         return MigrationProcessItem(this)
     }
 }
+
+class MigrationStatus {
+    companion object {
+        val RUNNUNG = 0
+        val MANGA_FOUND = 1
+        val MANGA_NOT_FOUND = 2
+    }
+}

app/src/main/java/eu/kanade/tachiyomi/ui/migration/manga/process/MigrationListController.kt

@@ -9,6 +9,7 @@ import android.view.MenuInflater
 import android.view.MenuItem
 import android.view.View
 import android.view.ViewGroup
+import android.widget.Toast
 import androidx.core.graphics.ColorUtils
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.vectordrawable.graphics.drawable.VectorDrawableCompat
@@ -233,6 +234,9 @@ class MigrationListController(bundle: Bundle? = null) : BaseController(bundle),
                     }
                 }
 
+                manga.migrationStatus = if (result == null) MigrationStatus.MANGA_NOT_FOUND else
+                    MigrationStatus.MANGA_FOUND
+                adapter?.sourceFinished()
                 manga.searchResult.initialize(result?.id)
             }
         }
@@ -281,19 +285,24 @@ class MigrationListController(bundle: Bundle? = null) : BaseController(bundle),
     fun useMangaForMigration(manga: Manga, source: Source) {
         val firstIndex = selectedPosition ?: return
         val migratingManga = adapter?.getItem(firstIndex) ?: return
-        migratingManga.showSpinner()
+        migratingManga.manga.migrationStatus = MigrationStatus.RUNNUNG
+        adapter?.notifyItemChanged(firstIndex)
         launchUI {
             val result = CoroutineScope(migratingManga.manga.migrationJob).async {
                 val localManga = smartSearchEngine.networkToLocalManga(manga, source.id)
                 val chapters = source.fetchChapterList(localManga).toSingle().await(
                     Schedulers.io()
                 )
-                withContext(Dispatchers.IO) {
+                try {
                     syncChaptersWithSource(db, chapters, localManga, source)
                 }
+                catch (e: Exception) {
+                    return@async null
+                }
                 localManga
             }.await()
 
+            if (result != null) {
                 try {
                     val newManga =
                         sourceManager.getOrStub(result.source).fetchMangaDetails(result).toSingle()
@@ -307,9 +316,16 @@ class MigrationListController(bundle: Bundle? = null) : BaseController(bundle),
                 } catch (e: Exception) {
                 }
 
+                migratingManga.manga.migrationStatus = MigrationStatus.MANGA_FOUND
                 migratingManga.manga.searchResult.set(result.id)
                 adapter?.notifyDataSetChanged()
             }
+            else {
+                migratingManga.manga.migrationStatus = MigrationStatus.MANGA_NOT_FOUND
+                activity?.toast(R.string.error_fetching_migration, Toast.LENGTH_LONG)
+                adapter?.notifyDataSetChanged()
+            }
+        }
     }
 
     fun migrateMangas() {

app/src/main/java/eu/kanade/tachiyomi/ui/migration/manga/process/MigrationProcessAdapter.kt

@@ -45,12 +45,10 @@ class MigrationProcessAdapter(
         if (allMangasDone()) menuItemListener.enableButtons()
     }
 
-    fun allMangasDone() = (items.all { it.manga.searchResult.initialized || !it.manga.migrationJob
-        .isActive } && items.any { it.manga
-        .searchResult.content != null })
+    fun allMangasDone() = (items.all { it.manga.migrationStatus != MigrationStatus
+        .RUNNUNG } && items.any {  it.manga.migrationStatus == MigrationStatus.MANGA_FOUND })
 
-    fun mangasSkipped() = (items.count { (!it.manga.searchResult.initialized || it.manga
-        .searchResult.content == null) })
+    fun mangasSkipped() = (items.count { it.manga.migrationStatus == MigrationStatus.MANGA_NOT_FOUND })
 
     suspend fun performMigrations(copy: Boolean) {
         withContext(Dispatchers.IO) {

app/src/main/java/eu/kanade/tachiyomi/ui/migration/manga/process/MigrationProcessHolder.kt

@@ -87,7 +87,8 @@ class MigrationProcessHolder(
                     sourceManager.get(it)
                 }
                 withContext(Dispatchers.Main) {
-                    if (item.manga.mangaId != this@MigrationProcessHolder.item?.manga?.mangaId) {
+                    if (item.manga.mangaId != this@MigrationProcessHolder.item?.manga?.mangaId ||
+                     item.manga.migrationStatus == MigrationStatus.RUNNUNG) {
                         return@withContext
                     }
                     if (searchResult != null && resultSource != null) {
@@ -101,7 +102,8 @@ class MigrationProcessHolder(
                         }
                     } else {
                         migration_manga_card_to.loading_group.gone()
-                        migration_manga_card_to.title.text = "No Alternatives Found"
+                        migration_manga_card_to.title.text = view.context.applicationContext
+                            .getString(R.string.no_alternatives_found)
                     }
                     migration_menu.visible()
                     skip_manga.gone()
@@ -111,10 +113,6 @@ class MigrationProcessHolder(
         }
     }
 
-    fun showSpinner() {
-        migration_manga_card_to.loading_group.visible()
-    }
-
     private fun View.resetManga() {
         loading_group.visible()
         thumbnail.setImageDrawable(null)

app/src/main/java/eu/kanade/tachiyomi/ui/migration/manga/process/MigrationProcessItem.kt

@@ -10,7 +10,6 @@ import eu.kanade.tachiyomi.R
 class MigrationProcessItem(val manga: MigratingManga) :
     AbstractFlexibleItem<MigrationProcessHolder>() {
 
-    var holder:MigrationProcessHolder? = null
     override fun getLayoutRes(): Int {
         return R.layout.migration_process_item
     }
@@ -23,8 +22,6 @@ class MigrationProcessItem(val manga: MigratingManga) :
         holder: MigrationProcessHolder,
         position: Int,
         payloads: MutableList<Any?>?) {
-
-        this.holder = holder
         holder.bind(this)
     }
 
@@ -36,10 +33,6 @@ class MigrationProcessItem(val manga: MigratingManga) :
         return false
     }
 
-    fun showSpinner() {
-        holder?.showSpinner()
-    }
-
     override fun hashCode(): Int {
         return manga.mangaId.toInt()
     }

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

@@ -426,6 +426,9 @@
     <string name="confirm_copy">Copy %1$d%2$s mangas?</string>
     <string name="skipping_x">(skipping %1$d)</string>
     <string name="no_migrations">No manga migrated</string>
+    <string name="error_fetching_migration">No chapters found, this manga cannot be used for
+        migration</string>
+    <string name="no_alternatives_found">No Alternatives Found</string>
 
     <!-- Tracking Screen -->
     <string name="manga_tracking_tab">Tracking</string>