import { VoiceChannel, Snowflake, TextChannel, StageChannel, Guild } from 'discord.js';
import {
    AudioPlayer,
    VoiceConnection,
    createAudioPlayer,
    joinVoiceChannel,
    createAudioResource,
    VoiceConnectionStatus,
    AudioPlayerStatus,
    AudioPlayerState,
    NoSubscriberBehavior,
    VoiceConnectionState,
    AudioPlayerError,
    DiscordGatewayAdapterCreator
} from '@discordjs/voice';
import playdl, { YouTubeVideo } from 'play-dl';
import { EventEmitter } from 'stream';

import DiscordProvider from './Discord';
import Environment from './Environment';

export type ValidTracks = YouTubeVideo;

if (Environment.get().YOUTUBE_COOKIE_BASE64) {
    playdl.setToken({
        youtube: {
            cookie: Buffer.from(Environment.get().YOUTUBE_COOKIE_BASE64, 'base64').toString()
        }
    });
}
export class Queue {
    public track: ValidTracks[] = [];
}

export class YouTubeLink {
    public videoId: string;
    public list?: string;

    constructor(videoId: string, list: string) {
        this.videoId = videoId;
        this.list = list;
    }
}

export class PlayerPlayingEvent {
    public instance: DiscordMusicPlayerInstance;

    constructor(instance: DiscordMusicPlayerInstance) {
        this.instance = instance;
    }
}

export class PlayerErrorEvent {
    public instance: DiscordMusicPlayerInstance;
    public error: Error;

    constructor(instance: DiscordMusicPlayerInstance, error: Error) {
        this.instance = instance;
        this.error = error;
    }
}

export class VoiceDisconnectedEvent {
    public instance: DiscordMusicPlayerInstance;

    constructor(instance: DiscordMusicPlayerInstance) {
        this.instance = instance;
    }
}

export enum DiscordMusicPlayerLoopMode {
    None = 'none',
    Current = 'current'
}
export class DiscordMusicPlayerInstance {
    public queue: Queue;
    public player: AudioPlayer;
    public textChannel?: TextChannel;
    public voiceChannel: VoiceChannel | StageChannel;
    public voiceConnection?: VoiceConnection;
    public previousTrack?: ValidTracks;

    public paused: boolean = false;
    public loopMode: DiscordMusicPlayerLoopMode = DiscordMusicPlayerLoopMode.None;

    public readonly events: EventEmitter;

    constructor({ voiceChannel }: { voiceChannel: VoiceChannel | StageChannel }) {
        this.queue = new Queue();
        this.player = createAudioPlayer({
            behaviors: {
                noSubscriber: NoSubscriberBehavior.Pause,
                maxMissedFrames: 1000
            }
        });
        this.voiceChannel = voiceChannel;
        this.events = new EventEmitter();

        this.player.on(AudioPlayerStatus.Idle, async (oldStage, newStage) => {
            //The player stopped
            if (
                newStage.status === AudioPlayerStatus.Idle &&
                oldStage.status !== AudioPlayerStatus.Idle
            ) {
                // Loop mode is set to current song
                if (this.loopMode === DiscordMusicPlayerLoopMode.Current) {
                    if (this.queue.track.length !== 0) {
                        this.previousTrack = this.queue.track[0];
                        this.playTrack(this.queue.track[0]);
                    }
                    return;
                }

                // There are more songs in the queue, remove finished song and play the next one
                if (this.queue.track.length !== 0) {
                    let previousTrack = this.queue.track.shift();
                    if (previousTrack) this.previousTrack = previousTrack;

                    if (this.queue.track.length > 0) {
                        this.playTrack(this.queue.track[0]);
                    }
                }
            }
        });

        this.player.on(AudioPlayerStatus.Playing, (oldState: any, newState: any) => {
            this.events.emit('playing', new PlayerPlayingEvent(this));
        });

        this.player.on('error', (error: Error) => {
            this.events.emit('error', new PlayerErrorEvent(this, error));
        });
    }

    public isReady() {
        if (!this.voiceConnection) return false;
        return this.voiceConnection.state.status === VoiceConnectionStatus.Ready;
    }

    public isConnected() {
        if (!this.voiceConnection) return false;

        if (this.voiceConnection.state.status === VoiceConnectionStatus.Destroyed) return false;
        if (this.voiceConnection.state.status === VoiceConnectionStatus.Disconnected) return false;

        return true;
    }

    public joinVoiceChannel(voiceChannel: VoiceChannel | StageChannel, textChannel?: TextChannel) {
        const permissions = voiceChannel.permissionsFor(DiscordProvider.client.user!);

        if (!permissions || !voiceChannel.joinable || !permissions.has('CONNECT'))
            throw new Error('No permissions');

        if (textChannel) this.textChannel = textChannel;

        this.voiceConnection = joinVoiceChannel({
            channelId: this.voiceChannel.id,
            guildId: this.voiceChannel.guild.id,
            adapterCreator: this.voiceChannel.guild
                .voiceAdapterCreator as DiscordGatewayAdapterCreator
        });

        this.voiceConnection.on(
            VoiceConnectionStatus.Ready,
            (oldState: VoiceConnectionState, newState: VoiceConnectionState) => {
                let currentVC = DiscordProvider.client.guilds.cache.get(voiceChannel.guild.id)?.me
                    ?.voice.channel;
                if (currentVC && currentVC.id !== this.voiceChannel.id) {
                    this.voiceChannel = currentVC;
                }
            }
        );

        this.voiceConnection.on(
            VoiceConnectionStatus.Disconnected,
            (oldState: VoiceConnectionState, newState: VoiceConnectionState) => {
                setTimeout(() => {
                    if (
                        !DiscordProvider.client.guilds.cache.get(voiceChannel.guildId!)!.me!.voice
                            .channelId
                    ) {
                        this.events.emit('disconnect', new VoiceDisconnectedEvent(this));
                    }
                }, 2000);
            }
        );
    }

    public async leaveVoiceChannel() {
        if (this.player) this.player.pause();

        if (DiscordProvider.client.guilds.cache.get(this.voiceChannel.guild.id)?.me?.voice) {
            this.voiceConnection?.disconnect();
        }
    }

    public async pausePlayer() {
        if (this.paused || !this.player) return;
        if (!this.player.pause(true)) throw new Error('Unable to pause player');
        this.paused = true;
    }

    public async resumePlayer() {
        if (!this.paused || !this.player) return;
        if (!this.player.unpause()) throw new Error('Unable to resume player');
        this.paused = false;
    }

    public addTrackToQueue(track: ValidTracks) {
        if (this.queue.track.length === 0) {
            this.queue.track.push(track);
            this.playTrack(this.queue.track[0]);
            return;
        }

        this.queue.track.push(track);
    }

    public async playTrack(track: ValidTracks) {
        if (!this.voiceConnection) throw new Error('No voice connection');

        try {
            const stream = await playdl.stream(track.url);
            const resource = createAudioResource(stream.stream, {
                inputType: stream.type
            });

            this.player.play(resource);
            this.voiceConnection.subscribe(this.player);
        } catch (error: any) {
            this.events.emit('error', new PlayerErrorEvent(this, error));
            this.skipTrack();
        }
    }

    public async skipTrack() {
        if (!this.voiceConnection) throw new Error('No voice connection');

        if (this.queue.track.length > 1) {
            this.previousTrack = this.queue.track[0];
            this.queue.track.shift();
            this.playTrack(this.queue.track[0]);
        } else {
            this.previousTrack = this.queue.track[0];
            this.queue.track.shift();
            this.player.stop();
        }
    }

    public setLoopMode(mode: DiscordMusicPlayerLoopMode) {
        this.loopMode = mode;
    }

    public getLoopMode() {
        return this.loopMode;
    }

    public getPreviousTrack(): ValidTracks | undefined {
        return this.previousTrack;
    }

    public isPaused() {
        return this.paused;
    }

    public async destroy() {
        await this.leaveVoiceChannel();

        if (this.voiceConnection) {
            this.voiceConnection.removeAllListeners();
            if (this.voiceConnection.state.status !== 'destroyed') this.voiceConnection.destroy();
        }

        if (this.player) {
            this.player.removeAllListeners();
            this.player.stop(true);
        }

        this.queue.track = [];
        this.textChannel = undefined;
        this.voiceConnection = undefined;
    }

    public async _fake_error_on_player() {
        const stream = 'https://fakestream:42069/fake/stream/fake/audio/fake.mp3';
        const resource = createAudioResource(stream);
        this.player.play(resource);
        this.player.emit(
            'error',
            new AudioPlayerError(new Error('Music player was manually crashed'), null!)
        );
    }
}

class DiscordMusicPlayer {
    public GuildQueue = new Map();

    public getGuildInstance(guildId: Snowflake): DiscordMusicPlayerInstance | null {
        if (!this.isGuildInstanceExists(guildId)) return null;
        return this.GuildQueue.get(guildId);
    }

    public isGuildInstanceExists(guildId: Snowflake) {
        return this.GuildQueue.has(guildId);
    }

    public createGuildInstance(guildId: Snowflake, voiceChannel: VoiceChannel | StageChannel) {
        this.GuildQueue.set(guildId, new DiscordMusicPlayerInstance({ voiceChannel }));
    }

    public async destoryGuildInstance(guild: Guild | Snowflake) {
        let guildId: Snowflake = guild instanceof Guild ? guild.id : guild;

        if (this.isGuildInstanceExists(guildId)) {
            await this.GuildQueue.get(guildId).destroy();
            this.GuildQueue.delete(guildId);
        }
    }

    public async searchYouTubeByQuery(query: string) {
        const searched: YouTubeVideo[] = await playdl.search(query, {
            source: { youtube: 'video' }
        });
        if (searched.length == 0) return null;
        return searched;
    }

    public async searchYouTubeByYouTubeLink(youtubeLink: YouTubeLink) {
        // Search the url
        const searched: YouTubeVideo[] = await playdl.search(
            'https://www.youtube.com/watch?v=' + youtubeLink.videoId,
            { source: { youtube: 'video' } }
        );
        for (let video of searched) {
            if (video.id === youtubeLink.videoId) return video;
        }

        // Serch the video Id
        const searched2: YouTubeVideo[] = await playdl.search(youtubeLink.videoId, {
            source: { youtube: 'video' }
        });
        for (let video of searched2) {
            if (video.id === youtubeLink.videoId) return video;
        }

        // Last resort, search the title
        const videoInfo = await playdl.video_basic_info(
            'https://www.youtube.com/watch?v=' + youtubeLink.videoId
        );
        if (videoInfo?.video_details?.title) {
            const searched: YouTubeVideo[] = await playdl.search(videoInfo.video_details.title, {
                source: { youtube: 'video' }
            });
            for (let video of searched) {
                if (video.id === youtubeLink.videoId) return video;
            }
        }

        let yt_info = await playdl.video_info(
            'https://www.youtube.com/watch?v=' + youtubeLink.videoId
        );
        if (yt_info) {
            return new YouTubeVideo({
                id: yt_info.video_details.id,
                url: yt_info.video_details.url,
                type: yt_info.video_details.type,
                title: yt_info.video_details.title,
                description: yt_info.video_details.description,
                durationRaw: yt_info.video_details.durationRaw,
                durationInSec: yt_info.video_details.durationInSec,
                uploadedAt: yt_info.video_details.uploadedAt,
                upcoming: yt_info.video_details.upcoming,
                views: yt_info.video_details.views,
                thumbnails: yt_info.video_details.thumbnails,
                channel: yt_info.video_details.channel,
                likes: yt_info.video_details.likes,
                live: yt_info.video_details.live,
                liveAt: yt_info.video_details.liveAt,
                private: yt_info.video_details.private,
                tags: yt_info.video_details.tags,
                discretionAdvised: yt_info.video_details.discretionAdvised,
                music: yt_info.video_details.music
            });
        }

        return null;
    }

    public async getYouTubeSongsInPlayList(youtubeLink: string) {
        return await playdl.playlist_info(youtubeLink, {
            incomplete: true
        });
    }

    public isYouTubeLink(link: string): boolean {
        try {
            this.parseYouTubeLink(link);
            return true;
        } catch (err) {
            return false;
        }
    }

    public parseYouTubeLink(query: string): YouTubeLink {
        if (
            query.startsWith('https://www.youtube.com/watch?v=') ||
            query.startsWith('http://www.youtube.com/watch?v=')
        ) {
            let data = this.parseURLQuery(query);
            if (!data.v) throw new Error('YouTube link is invalid');
            return {
                videoId: data.v,
                list: data.list ? (data.list !== 'RDMM' ? data.list : undefined) : undefined
            };
        } else if (query.startsWith('https://youtu.be/') || query.startsWith('http://youtu.be/')) {
            //Get youtube video id after the url
            let videoId = query.split('/')[3];

            if (!videoId) throw new Error('YouTube link is invalid');
            if (query.split('/')[4]) throw new Error('YouTube link is invalid');

            return {
                videoId: videoId
            };
        } else if (
            query.startsWith('https://www.youtube.com/playlist?list=') ||
            query.startsWith('http://www.youtube.com/playlist?list=')
        ) {
            let listId = query.split('?list=')[1];
            return {
                videoId: '',
                list: listId
            };
        } else {
            throw new Error('YouTube link is invalid');
        }
    }

    private parseURLQuery(query: string) {
        let queryObject: any = {};
        if (query.indexOf('?') >= 0) {
            let queryString = query.split('?')[1];
            let queryArray = queryString.split('&');
            for (let i = 0; i < queryArray.length; i++) {
                let queryPair = queryArray[i].split('=');
                queryObject[queryPair[0]] = queryPair[1];
            }
        }
        return queryObject;
    }
}

const DiscordMusicPlayer_Instance = new DiscordMusicPlayer();
export default DiscordMusicPlayer_Instance;