/*
 * Copyright (c) 2017 Frederik Ar. Mikkelsen & NoobLance
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package lavalink.server.player;

import com.sedmelluq.discord.lavaplayer.filter.equalizer.Equalizer;
import com.sedmelluq.discord.lavaplayer.filter.equalizer.EqualizerFactory;
import com.sedmelluq.discord.lavaplayer.player.AudioPlayer;
import com.sedmelluq.discord.lavaplayer.player.AudioPlayerManager;
import com.sedmelluq.discord.lavaplayer.player.event.AudioEventAdapter;
import com.sedmelluq.discord.lavaplayer.track.AudioTrack;
import com.sedmelluq.discord.lavaplayer.track.AudioTrackEndReason;
import com.sedmelluq.discord.lavaplayer.track.playback.AudioFrame;
import lavalink.server.io.SocketContext;
import lavalink.server.io.SocketServer;
import net.dv8tion.jda.api.audio.AudioSendHandler;
import org.json.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.annotation.Nullable;
import java.nio.ByteBuffer;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;

public class Player extends AudioEventAdapter implements AudioSendHandler {

    private static final Logger log = LoggerFactory.getLogger(Player.class);

    private SocketContext socketContext;
    private final String guildId;
    private final AudioPlayer player;
    private AudioLossCounter audioLossCounter = new AudioLossCounter();
    private AudioFrame lastFrame = null;
    private ScheduledFuture myFuture = null;
    private EqualizerFactory equalizerFactory = new EqualizerFactory();
    private boolean isEqualizerApplied = false;

    public Player(SocketContext socketContext, String guildId, AudioPlayerManager audioPlayerManager) {
        this.socketContext = socketContext;
        this.guildId = guildId;
        this.player = audioPlayerManager.createPlayer();
        this.player.addListener(this);
        this.player.addListener(new EventEmitter(audioPlayerManager, this));
        this.player.addListener(audioLossCounter);
    }

    public void play(AudioTrack track) {
        player.playTrack(track);
    }

    public void stop() {
        player.stopTrack();
    }

    public void setPause(boolean b) {
        player.setPaused(b);
    }

    public String getGuildId() {
        return guildId;
    }

    public void seekTo(long position) {
        AudioTrack track = player.getPlayingTrack();

        if (track == null) throw new RuntimeException("Can't seek when not playing anything");

        track.setPosition(position);
    }

    public void setVolume(int volume) {
        player.setVolume(volume);
    }

    public void setBandGain(int band, float gain) {
        log.debug("Setting band {}'s gain to {}", band, gain);
        equalizerFactory.setGain(band, gain);

        if (gain == 0.0f) {
            if (!isEqualizerApplied) {
                return;
            }

            boolean shouldDisable = true;

            for (int i = 0; i < Equalizer.BAND_COUNT; i++) {
                if (equalizerFactory.getGain(i) != 0.0f) {
                    shouldDisable = false;
                }
            }

            if (shouldDisable) {
                this.player.setFilterFactory(null);
                this.isEqualizerApplied = false;
            }
        } else if (!this.isEqualizerApplied) {
            this.player.setFilterFactory(equalizerFactory);
            this.isEqualizerApplied = true;
        }
    }

    public JSONObject getState() {
        JSONObject json = new JSONObject();

        if (player.getPlayingTrack() != null)
            json.put("position", player.getPlayingTrack().getPosition());
        json.put("time", System.currentTimeMillis());

        return json;
    }

    SocketContext getSocket() {
        return socketContext;
    }

    @Nullable
    public AudioTrack getPlayingTrack() {
        return player.getPlayingTrack();
    }

    public boolean isPaused() {
        return player.isPaused();
    }

    @Override
    public boolean canProvide() {
        lastFrame = player.provide();

        if(lastFrame == null) {
            audioLossCounter.onLoss();
            return false;
        } else {
            audioLossCounter.onSuccess();
            return true;
        }
    }

    @Override
    public ByteBuffer provide20MsAudio() {
        return ByteBuffer.wrap(lastFrame.getData());
    }

    @Override
    public boolean isOpus() {
        return true;
    }

    public AudioLossCounter getAudioLossCounter() {
        return audioLossCounter;
    }

    public boolean isPlaying() {
        return player.getPlayingTrack() != null && !player.isPaused();
    }

    @Override
    public void onTrackEnd(AudioPlayer player, AudioTrack track, AudioTrackEndReason endReason) {
        myFuture.cancel(false);
    }

    @Override
    public void onTrackStart(AudioPlayer player, AudioTrack track) {
        if (myFuture == null || myFuture.isCancelled()) {
            myFuture = socketContext.getPlayerUpdateService().scheduleAtFixedRate(() -> {
                if (socketContext.getSessionPaused()) return;

                SocketServer.Companion.sendPlayerUpdate(socketContext, this);
            }, 0, 5, TimeUnit.SECONDS);
        }
    }

}