discord-jellyfin-bot/src/playbackmanager.js

const interactivemsghandler = require("./interactivemsghandler");
const CONFIG = require("../config.json");
const discordclientmanager = require("./discordclientmanager");
const log = require("loglevel");

const {
	getAudioDispatcher,
	setAudioDispatcher
} = require("./dispachermanager");
const {
	ticksToSeconds
} = require("./util");

// this whole thing should be a class but its probably too late now.

var currentPlayingPlaylist;
var currentPlayingPlaylistIndex;
var isPaused;
var isRepeat;
var _disconnectOnFinish;
var _seek;

const jellyfinClientManager = require("./jellyfinclientmanager");

function streamURLbuilder (itemID, bitrate) {
	// so the server transcodes. Seems appropriate as it has the source file.(doesnt yet work i dont know why)
	const supportedCodecs = "opus";
	const supportedContainers = "ogg,opus";
	return `${jellyfinClientManager.getJellyfinClient().serverAddress()}/Audio/${itemID}/universal?UserId=${jellyfinClientManager.getJellyfinClient().getCurrentUserId()}&DeviceId=${jellyfinClientManager.getJellyfinClient().deviceId()}&MaxStreamingBitrate=${bitrate}&Container=${supportedContainers}&AudioCodec=${supportedCodecs}&api_key=${jellyfinClientManager.getJellyfinClient().accessToken()}&TranscodingContainer=ts&TranscodingProtocol=hls`;
}

function startPlaying (voiceconnection = discordclientmanager.getDiscordClient().user.client.voice.connections.first(), itemIDPlaylist = currentPlayingPlaylist, playlistIndex = currentPlayingPlaylistIndex, seekTo, disconnectOnFinish = _disconnectOnFinish) {
	log.debug("start playing ",playlistIndex, ". of list: ",itemIDPlaylist," in a voiceconnection?: ", typeof voiceconnection !== "undefined");
	isPaused = false;
	currentPlayingPlaylist = itemIDPlaylist;
	currentPlayingPlaylistIndex = playlistIndex;
	_disconnectOnFinish = disconnectOnFinish;
	_seek = seekTo * 1000;
	updatePlayMessage();
	async function playasync () {
		const url = streamURLbuilder(itemIDPlaylist[playlistIndex], voiceconnection.channel.bitrate);
		setAudioDispatcher(voiceconnection.play(url, {
			seek: seekTo
		}));
		if (seekTo) {
			jellyfinClientManager.getJellyfinClient().reportPlaybackProgress(getProgressPayload());
		} else {
			jellyfinClientManager.getJellyfinClient().reportPlaybackStart({
				userID: `${jellyfinClientManager.getJellyfinClient().getCurrentUserId()}`,
				itemID: `${itemIDPlaylist[playlistIndex]}`,
				canSeek: true,
				playSessionId: getPlaySessionId(),
				playMethod: getPlayMethod()
			});
		}

		getAudioDispatcher().on("finish", () => {
			if (isRepeat) {
				startPlaying(voiceconnection, undefined, currentPlayingPlaylistIndex, 0);
			} else {
				if (currentPlayingPlaylist.length < playlistIndex) {
					if (disconnectOnFinish) {
						stop(voiceconnection, currentPlayingPlaylist[playlistIndex - 1]);
					} else {
						stop(undefined, currentPlayingPlaylist[playlistIndex - 1]);
					}
				} else {
					startPlaying(voiceconnection, undefined, currentPlayingPlaylistIndex + 1, 0);
				}
			}
		});
	}
	playasync().catch((rsn) => {
		console.error(rsn);
	});
}

async function spawnPlayMessage (message) {
	log.debug("spawned Play Message?: ",typeof message !== "undefined");
	const itemIdDetails = await jellyfinClientManager.getJellyfinClient().getItem(jellyfinClientManager.getJellyfinClient().getCurrentUserId(), getItemId());
	const imageURL = await jellyfinClientManager.getJellyfinClient().getImageUrl(itemIdDetails.AlbumId || getItemId(), { type: "Primary" });
	try {
		interactivemsghandler.init(message, itemIdDetails.Name, itemIdDetails.Artists[0] || "VA", imageURL,
			`${jellyfinClientManager.getJellyfinClient().serverAddress()}/web/index.html#!/details?id=${itemIdDetails.AlbumId}`,
			itemIdDetails.RunTimeTicks,
			((ticksToSeconds(getPostitionTicks()) > 10) ? previousTrack : seek),
			playPause,
			() => { stop(_disconnectOnFinish ? discordclientmanager.getDiscordClient().user.client.voice.connections.first() : undefined); },
			nextTrack,
			() => { setIsRepeat(!isRepeat); },
			currentPlayingPlaylist.length);
		if (typeof CONFIG["interactive-seek-bar-update-intervall"] === "number") {
			interactivemsghandler.startUpate(getPostitionTicks);
		}
	} catch (error) {
		console.error(error);
	}
}

async function updatePlayMessage () {
	if (getItemId() !== undefined) {
		const itemIdDetails = await jellyfinClientManager.getJellyfinClient().getItem(jellyfinClientManager.getJellyfinClient().getCurrentUserId(), getItemId());
		const imageURL = await jellyfinClientManager.getJellyfinClient().getImageUrl(itemIdDetails.AlbumId || getItemId(), { type: "Primary" });
		interactivemsghandler.updateCurrentSongMessage(itemIdDetails.Name, itemIdDetails.Artists[0] || "VA", imageURL,
			`${jellyfinClientManager.getJellyfinClient().serverAddress()}/web/index.html#!/details?id=${itemIdDetails.AlbumId}`, itemIdDetails.RunTimeTicks, currentPlayingPlaylistIndex + 1, currentPlayingPlaylist.length);
	}
}

/**
 * @param {Number} toSeek - where to seek in ticks
 */
function seek (toSeek = 0) {
	log.debug("seek to: ", toSeek);
	if (getAudioDispatcher()) {
		startPlaying(undefined, undefined, undefined, ticksToSeconds(toSeek), _disconnectOnFinish);
		jellyfinClientManager.getJellyfinClient().reportPlaybackProgress(getProgressPayload());
	} else {
		throw Error("No Song Playing");
	}
}
/**
 *
 * @param {Array} itemID - array of itemIDs to be added
 */
function addTracks (itemID) {
	log.debug("added track: ",itemID);
	currentPlayingPlaylist = currentPlayingPlaylist.concat(itemID);
}

function nextTrack () {
	log.debug("nextTrack");
	if (!(currentPlayingPlaylist)) {
		throw Error("There is currently nothing playing");
	} else if (currentPlayingPlaylistIndex + 1 >= currentPlayingPlaylist.length) {
		throw Error("This is the Last song");
	}
	jellyfinClientManager.getJellyfinClient().reportPlaybackStopped(getStopPayload());

	startPlaying(undefined, undefined, currentPlayingPlaylistIndex + 1, 0, _disconnectOnFinish);
}

function previousTrack () {
	log.debug("previousTrack");
	if (ticksToSeconds(getPostitionTicks()) < 10) {
		if (!(currentPlayingPlaylist)) {
			throw Error("There is currently nothing playing");
		} else if (currentPlayingPlaylistIndex - 1 < 0) {
			startPlaying(undefined, undefined, currentPlayingPlaylistIndex, 0, _disconnectOnFinish);
			throw Error("This is the First song");
		}
		jellyfinClientManager.getJellyfinClient().reportPlaybackStopped(getStopPayload());

		startPlaying(undefined, undefined, currentPlayingPlaylistIndex - 1, 0, _disconnectOnFinish);
	}
}

/**
 * @param {Object=} disconnectVoiceConnection - Optional The voice Connection do disconnect from
 */
function stop (disconnectVoiceConnection, itemId = getItemId()) {
	
	isPaused = true;
	if (interactivemsghandler.hasMessage()) {
		interactivemsghandler.destroy();
	}
	if (disconnectVoiceConnection) {
		disconnectVoiceConnection.disconnect();
	}
	log.debug("stop playback and send following payload to the server: ",getStopPayload());
	jellyfinClientManager.getJellyfinClient().reportPlaybackStopped(getStopPayload());
	if (getAudioDispatcher()) {
		try {
			getAudioDispatcher().destroy();
		} catch (error) {
			console.error(error);
		}
	}
	setAudioDispatcher(undefined);
}

function pause () {
	log.debug("pause");
	isPaused = true;
	jellyfinClientManager.getJellyfinClient().reportPlaybackProgress(getProgressPayload());
	getAudioDispatcher().pause(true);
}

function resume () {
	log.debug("resume");
	isPaused = false;
	jellyfinClientManager.getJellyfinClient().reportPlaybackProgress(getProgressPayload());
	getAudioDispatcher().resume();
}

function playPause () {
	if (!(getAudioDispatcher())) {
		throw Error("There is nothing Playing right now!");
	}
	if (getAudioDispatcher().paused) {
		resume();
	} else {
		pause();
	}
}

function getPostitionTicks () {
	// this is very sketchy but i dont know how else to do it
	return (_seek + getAudioDispatcher().streamTime - getAudioDispatcher().pausedTime) * 10000;
}

function getPlayMethod () {
	// TODO figure out how to figure this out
	return "Transcode";
}

function getRepeatMode () {
	if (isRepeat) {
		return "RepeatOne";
	} else {
		return "RepeatNone";
	}
}

function getPlaylistItemId () {
	return getItemId();
}

function getPlaySessionId () {
	// i think its just a number which you dont need to retrieve but need to report
	return "ae2436edc6b91b11d72aeaa67f84e0ea";
}

function getNowPLayingQueue () {
	return [{
		Id: getItemId(),
		// as I curently dont support Playlists
		PlaylistItemId: getPlaylistItemId()
	}];
}

function getCanSeek () {
	return true;
}

function getIsMuted () {
	return false;
}

function getVolumeLevel () {
	return 100;
}

function getItemId () {
	if (typeof currentPlayingPlaylist !== "undefined") {
		return currentPlayingPlaylist[currentPlayingPlaylistIndex];
	}
	return undefined;
}

function getIsPaused () {
	// AudioDispacker Paused is to slow

	if (isPaused === undefined) {
		isPaused = false;
	}

	return isPaused;
}

function setIsRepeat (arg) {
	if (arg === undefined) {
		if (!(isRepeat === undefined)) {
			isRepeat = !isRepeat;
		}
	}
	isRepeat = arg;
}

function getProgressPayload () {
	const payload = {
		CanSeek: getCanSeek(),
		IsMuted: getIsMuted(),
		IsPaused: getIsPaused(),
		ItemId: getItemId(),
		MediaSourceId: getItemId(),
		NowPlayingQueue: getNowPLayingQueue(),
		PlayMethod: getPlayMethod(),
		PlaySessionId: getPlaySessionId(),
		PlaylistItemId: getPlaylistItemId(),
		PositionTicks: getPostitionTicks(),
		RepeatMode: getRepeatMode(),
		VolumeLevel: getVolumeLevel(),
		EventName: "pauseplayupdate"
	};
	return payload;
}

function getStopPayload () {
	const payload = {
		userId: jellyfinClientManager.getJellyfinClient().getCurrentUserId(),
		itemId: getItemId(),
		sessionID: getPlaySessionId(),
		playSessionId: getPlaySessionId(),
		positionTicks: getPostitionTicks()
	};
	return payload;
}

module.exports = {
	startPlaying,
	stop,
	playPause,
	resume,
	pause,
	seek,
	setIsRepeat,
	nextTrack,
	previousTrack,
	addTracks,
	getPostitionTicks,
	spawnPlayMessage
};