/*
 * Copyright (C) 2022 jimj316
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package moe.nekojimi.chords;

import java.util.List;
import java.util.PriorityQueue;
import java.util.Queue;
import java.util.function.Consumer;

/**
 *
 * @author jimj316
 */
public class QueueManager extends QueueThing<Track, Track>
{

    private final int QUEUE_TARGET_SIZE = 5;

    private Track restartingTrack = null;
//    private final PriorityQueue<Track> jukeboxQueue = new PriorityQueue<>();
    private QueueThing<?, Track> trackSource;
    private Playlist playlist;
    private MusicHandler handler;

    public QueueManager()
    {
        super(new PriorityQueue<Track>());
        queueTargetSize = QUEUE_TARGET_SIZE;
//        jukeboxQueue = new LinkedList<>();
    }

    @Override
    protected void notifyNewInput()
    {
        super.notifyNewInput();

//        if (inputQueue.size() < QUEUE_TARGET_SIZE)
//            demandInput(QUEUE_TARGET_SIZE - inputQueue.size());

        if (handler != null && !handler.isPlaying() || handler.getCurrentTrack() == null)
            handler.requestTrack();
    }

    @Override
    protected boolean completePromise(Promise<Track, Track> request)
    {
        final Track input = request.getInput();
        if (input != null)
        {
            request.complete(input);
            return true;
        }
        return false;
    }

    @Override
    public List<Promise<Track, Track>> request(int count, Consumer<Track> destination)
    {
        if (restartingTrack != null)
        {
            Promise ret = new Promise<>(restartingTrack, destination);
            restartingTrack = null;
            return List.of(ret);
        }

        List<Promise<Track, Track>> ret = super.request(count, destination);
        if (inputQueue.size() < QUEUE_TARGET_SIZE)
            demandInput(QUEUE_TARGET_SIZE - inputQueue.size());
        return ret;
    }

    /**
     * Called by the music handler when the current track has ended, or if
     * playNext is called with nothing playing.
     *
     * @return the next track to play, or null to stop playing.
     */
//    public Track nextTrackNeeded()
//    {
//        Track ret;
//        // if we're restarting the current track: store, clear, and return it
//        if (restartingTrack != null)
//        {
//            ret = restartingTrack;
//            restartingTrack = null;
//        }
//        // if there's anything in the queue, play that first
//        else if (!jukeboxQueue.isEmpty())
//        {
//            ret = jukeboxQueue.poll();
//        }
//        // otherwise if there's a playlist, shuffle from that
//        else if (playlist != null)
//        {
//            ret = playlist.getNextTrack();
//        }
//        // otherwise stop playing
//        else
//            ret = null;
//
//        return ret;
//    }

    public MusicHandler getHandler()
    {
        return handler;
    }

    public void addTrack(Track track)
    {
        System.out.println("Track added to queue: " + track.getLocation().getAbsolutePath());
        inputQueue.add(track);

    }

    public boolean removeTrack(int i)
    {
        try
        {
            return inputQueue.remove((Track) inputQueue.toArray()[i]);
        } catch (ArrayIndexOutOfBoundsException ex)
        {
            return false;
        }
    }

    public boolean removeTrack(Track track)
    {
        return inputQueue.remove(track);
    }

    public void setHandler(MusicHandler handler)
    {
        this.handler = handler;
        handler.setQueueManager(this);
    }

    public Queue<Track> getJukeboxQueue()
    {
        return inputQueue;
    }

    public Playlist getPlaylist()
    {
        return playlist;
    }

    public void setPlaylist(Playlist playlist)
    {
        this.playlist = playlist;
    }

    public boolean restartTrack()
    {
        restartingTrack = handler.getCurrentTrack();
        if (restartingTrack != null)
        {
            handler.requestTrack();
            return true;
        } else
            return false;
    }

    public QueueThing<?, Track> getTrackSource()
    {
        return trackSource;
    }

    public void setTrackSource(QueueThing<?, Track> trackSource)
    {
        this.trackSource = trackSource;
    }
}