Save changes to the database and bugfix

app/src/main/java/org/schabi/newpipe/database/playlist/PlaylistLocalItem.java

@@ -24,6 +24,12 @@ public interface PlaylistLocalItem extends LocalItem {
         final List<PlaylistLocalItem> result = new ArrayList<>(
                 localPlaylists.size() + remotePlaylists.size());
         final List<PlaylistLocalItem> itemsWithSameIndex = new ArrayList<>();
+
+        // The data from database may not be in the displayIndex order
+        Collections.sort(localPlaylists,
+                Comparator.comparingLong(PlaylistMetadataEntry::getDisplayIndex));
+        Collections.sort(remotePlaylists,
+                Comparator.comparingLong(PlaylistRemoteEntity::getDisplayIndex));
         int i = 0;
         int j = 0;
         while (i < localPlaylists.size()) {
@@ -41,10 +47,6 @@ public interface PlaylistLocalItem extends LocalItem {
         }
         addItemsWithSameIndex(result, itemsWithSameIndex);
 
-        // If displayIndex does not match actual index, update displayIndex.
-        // This may happen when a new list is created with default displayIndex = 0.
-        // todo: update displayIndex
-
         return result;
     }
 
@@ -52,8 +54,8 @@ public interface PlaylistLocalItem extends LocalItem {
                         final List<PlaylistLocalItem> itemsWithSameIndex) {
         if (!itemsWithSameIndex.isEmpty()
                 && itemsWithSameIndex.get(0).getDisplayIndex() != item.getDisplayIndex()) {
-            // The new item has a different displayIndex,
-            // add previous items with same index to the result.
+            // The new item has a different displayIndex, add previous items with same
+            // index to the result.
             addItemsWithSameIndex(result, itemsWithSameIndex);
             itemsWithSameIndex.clear();
         }

app/src/main/java/org/schabi/newpipe/database/playlist/dao/PlaylistRemoteDAO.java

@@ -31,6 +31,10 @@ public interface PlaylistRemoteDAO extends BasicDAO<PlaylistRemoteEntity> {
             + " WHERE " + REMOTE_PLAYLIST_SERVICE_ID + " = :serviceId")
     Flowable<List<PlaylistRemoteEntity>> listByService(int serviceId);
 
+    @Query("SELECT * FROM " + REMOTE_PLAYLIST_TABLE + " WHERE "
+            + REMOTE_PLAYLIST_ID + " = :playlistId")
+    Flowable<List<PlaylistRemoteEntity>> getPlaylist(long playlistId);
+
     @Query("SELECT * FROM " + REMOTE_PLAYLIST_TABLE + " WHERE "
             + REMOTE_PLAYLIST_URL + " = :url AND " + REMOTE_PLAYLIST_SERVICE_ID + " = :serviceId")
     Flowable<List<PlaylistRemoteEntity>> getPlaylist(long serviceId, String url);

app/src/main/java/org/schabi/newpipe/database/playlist/model/PlaylistEntity.java

@@ -2,6 +2,7 @@ package org.schabi.newpipe.database.playlist.model;
 
 import androidx.room.ColumnInfo;
 import androidx.room.Entity;
+import androidx.room.Ignore;
 import androidx.room.Index;
 import androidx.room.PrimaryKey;
 
@@ -28,11 +29,12 @@ public class PlaylistEntity {
     private String thumbnailUrl;
 
     @ColumnInfo(name = PLAYLIST_DISPLAY_INDEX)
-    private long displayIndex = 0;
+    private long displayIndex;
 
-    public PlaylistEntity(final String name, final String thumbnailUrl) {
+    public PlaylistEntity(final String name, final String thumbnailUrl, final long displayIndex) {
         this.name = name;
         this.thumbnailUrl = thumbnailUrl;
+        this.displayIndex = displayIndex;
     }
 
     public long getUid() {

app/src/main/java/org/schabi/newpipe/local/LocalItemListAdapter.java

@@ -142,6 +142,7 @@ public class LocalItemListAdapter extends RecyclerView.Adapter<RecyclerView.View
     }
 
     public boolean swapItems(final int fromAdapterPosition, final int toAdapterPosition) {
+        // todo: reuse this code?
         final int actualFrom = adapterOffsetWithoutHeader(fromAdapterPosition);
         final int actualTo = adapterOffsetWithoutHeader(toAdapterPosition);
 

app/src/main/java/org/schabi/newpipe/local/bookmark/BookmarkFragment.java

@@ -199,6 +199,13 @@ public final class BookmarkFragment extends BaseLocalListFragment<List<PlaylistL
 
             @Override
             public void onNext(final List<PlaylistLocalItem> subscriptions) {
+
+                // If displayIndex does not match actual index, update displayIndex.
+                // This may happen when a new list is created
+                // or on the first run after database update
+                // or displayIndex is not continuous for some reason.
+                checkDisplayIndexUpdate(subscriptions);
+
                 handleResult(subscriptions);
                 if (databaseSubscription != null) {
                     databaseSubscription.request(1);
@@ -212,7 +219,8 @@ public final class BookmarkFragment extends BaseLocalListFragment<List<PlaylistL
             }
 
             @Override
-            public void onComplete() { }
+            public void onComplete() {
+            }
         };
     }
 
@@ -316,5 +324,60 @@ public final class BookmarkFragment extends BaseLocalListFragment<List<PlaylistL
                                 "Changing playlist name")));
         disposables.add(disposable);
     }
+
+    private void changeLocalPlaylistDisplayIndex(final long id, final long displayIndex) {
+
+        if (localPlaylistManager == null) {
+            return;
+        }
+
+        if (DEBUG) {
+            Log.d(TAG, "Updating local playlist id=[" + id + "] "
+                    + "with new display_index=[" + displayIndex + "]");
+        }
+
+        final Disposable disposable =
+                localPlaylistManager.changePlaylistDisplayIndex(id, displayIndex)
+                        .observeOn(AndroidSchedulers.mainThread())
+                        .subscribe(longs -> { /*Do nothing on success*/ }, throwable -> showError(
+                                new ErrorInfo(throwable,
+                                        UserAction.REQUESTED_BOOKMARK,
+                                        "Changing local playlist display_index")));
+        disposables.add(disposable);
+    }
+
+    private void changeRemotePlaylistDisplayIndex(final long id, final long displayIndex) {
+
+        if (remotePlaylistManager == null) {
+            return;
+        }
+
+        if (DEBUG) {
+            Log.d(TAG, "Updating remote playlist id=[" + id + "] "
+                    + "with new display_index=[" + displayIndex + "]");
+        }
+
+        final Disposable disposable =
+                remotePlaylistManager.changePlaylistDisplayIndex(id, displayIndex)
+                        .observeOn(AndroidSchedulers.mainThread())
+                        .subscribe(longs -> { /*Do nothing on success*/ }, throwable -> showError(
+                                new ErrorInfo(throwable,
+                                        UserAction.REQUESTED_BOOKMARK,
+                                        "Changing remote playlist display_index")));
+        disposables.add(disposable);
+    }
+
+    private void checkDisplayIndexUpdate(@NonNull final List<PlaylistLocalItem> result) {
+        for (int i = 0; i < result.size(); i++) {
+            final PlaylistLocalItem item = result.get(i);
+            if (item.getDisplayIndex() != i) {
+                if (item instanceof PlaylistMetadataEntry) {
+                    changeLocalPlaylistDisplayIndex(((PlaylistMetadataEntry) item).uid, i);
+                } else if (item instanceof PlaylistRemoteEntity) {
+                    changeRemotePlaylistDisplayIndex(((PlaylistRemoteEntity) item).getUid(), i);
+                }
+            }
+        }
+    }
 }
 

app/src/main/java/org/schabi/newpipe/local/playlist/LocalPlaylistManager.java

@@ -40,8 +40,11 @@ public class LocalPlaylistManager {
             return Maybe.empty();
         }
         final StreamEntity defaultStream = streams.get(0);
+
+        // Make sure the new playlist is always on the top of bookmark.
+        // The index will be reassigned to non-negative number in BookmarkFragment.
         final PlaylistEntity newPlaylist =
-                new PlaylistEntity(name, defaultStream.getThumbnailUrl());
+                new PlaylistEntity(name, defaultStream.getThumbnailUrl(), -1);
 
         return Maybe.fromCallable(() -> database.runInTransaction(() ->
                 upsertStreams(playlistTable.insert(newPlaylist), streams, 0))

app/src/main/java/org/schabi/newpipe/local/playlist/RemotePlaylistManager.java

@@ -8,6 +8,7 @@ import org.schabi.newpipe.extractor.playlist.PlaylistInfo;
 import java.util.List;
 
 import io.reactivex.rxjava3.core.Flowable;
+import io.reactivex.rxjava3.core.Maybe;
 import io.reactivex.rxjava3.core.Single;
 import io.reactivex.rxjava3.schedulers.Schedulers;
 
@@ -33,6 +34,20 @@ public class RemotePlaylistManager {
                 .subscribeOn(Schedulers.io());
     }
 
+    public Maybe<Integer> changePlaylistDisplayIndex(final long playlistId,
+                                                     final long displayIndex) {
+        return playlistRemoteTable.getPlaylist(playlistId)
+                .firstElement()
+                .filter(playlistRemoteEntities -> !playlistRemoteEntities.isEmpty())
+                .map(playlistRemoteEntities -> {
+                    final PlaylistRemoteEntity playlist = playlistRemoteEntities.get(0);
+                    if (displayIndex != -1) {
+                        playlist.setDisplayIndex(displayIndex);
+                    }
+                    return playlistRemoteTable.update(playlist);
+                }).subscribeOn(Schedulers.io());
+    }
+
     public Single<Long> onBookmark(final PlaylistInfo playlistInfo) {
         return Single.fromCallable(() -> {
             final PlaylistRemoteEntity playlist = new PlaylistRemoteEntity(playlistInfo);