// @license magnet:?xt=urn:btih:1f739d935676111cfff4b4693e3816e664797050&dn=gpl-3.0.txt GPL-v3-or-Later

var LMS = LMS || {};

// Keep in sync with MediaPlayer::TranscodeMode cpp
const TranscodeMode = {
	Never: 0,
	Always: 1,
	IfFormatNotSupported: 2,
}

const Mode = {
	Transcode: 1,
	File: 2,
}
Object.freeze(Mode);

LMS.mediaplayer = function () {

	var _root = {};
	var _elems = {};
	var _offset = 0;
	var _duration = 0;
	var _audioNativeSrc;
	var _audioTranscodedSrc;
	var _transcodeMode = TranscodeMode.Never;
	var _transcodeFormat = 0;
	var _transcodeBitrate = 0;

	var _updateControls = function() {
		if (_elems.audio.paused) {
			_elems.playpause.classList.remove("fa-pause");
			_elems.playpause.classList.add("fa-play");
			_elems.progress.classList.remove("active");
		}
		else {
			_elems.playpause.classList.remove("fa-play");
			_elems.playpause.classList.add("fa-pause");
			_elems.progress.classList.add("active");
		}
	}

	var _durationToString = function (duration) {
			var minutes = parseInt(duration / 60, 10);
			var seconds = parseInt(duration, 10) % 60;

			var res = "";

			res += minutes + ":";
			res += (seconds  < 10 ? "0" + seconds : seconds);

			return res;
	}

	var _playTrack = function() {
		var playPromise = _elems.audio.play();

		if (playPromise !== undefined) {
			playPromise.then(_ => {
				// Automatic playback started
			})
			.catch(error => {
				// Auto-play was prevented
			});
		}
	}

	var _requestPreviousTrack = function() {
		Wt.emit(_root, "playPrevious");
	}

	var _requestNextTrack = function() {
		Wt.emit(_root, "playNext");
	}

	var _initVolume = function() {
		if (typeof(Storage) !== "undefined" && localStorage.volume) {
			_elems.volumeslider.value = Number(localStorage.volume);
		}

		_setVolume(_elems.volumeslider.value);
	}

	var _initTranscodeSettings = function(defaultTranscodeMode, defaultTranscodeFormat, defaultTranscodeBitrate) {
		if (typeof(Storage) !== "undefined" && localStorage.transcodeMode) {
			_transcodeMode = Number(localStorage.transcodeMode);
		}
		else {
			_transcodeMode = defaultTranscodeMode;
		}
		if (typeof(Storage) !== "undefined" && localStorage.transcodeFormat) {
			_transcodeFormat = Number(localStorage.transcodeFormat);
		}
		else {
			_transcodeFormat = defaultTranscodeFormat;
		}
		if (typeof(Storage) !== "undefined" && localStorage.transcodeBitrate) {
			_transcodeBitrate = Number(localStorage.transcodeBitrate);
		}
		else {
			_transcodeBitrate = defaultTranscodeBitrate;
		}

		Wt.emit(_root, "settingsLoaded", _transcodeMode, _transcodeFormat, _transcodeBitrate);
	}

	var _setVolume = function(volume) {
		_elems.lastvolume = _elems.audio.volume;

		_elems.audio.volume = volume;
		_elems.volumeslider.value = volume;

		if (volume > 0.5) {
			_elems.volume.classList.remove("fa-volume-off");
			_elems.volume.classList.remove("fa-volume-down");
			_elems.volume.classList.add("fa-volume-up");
		}
		else if (volume > 0) {
			_elems.volume.classList.remove("fa-volume-off");
			_elems.volume.classList.remove("fa-volume-up");
			_elems.volume.classList.add("fa-volume-down");

		}
		else {
			_elems.volume.classList.remove("fa-volume-up");
			_elems.volume.classList.remove("fa-volume-down");
			_elems.volume.classList.add("fa-volume-off");
		}

		if (typeof(Storage) !== "undefined") {
			localStorage.volume = volume;
		}
	}

	var init = function(root, defaultTranscodeMode, defaultTranscodeFormat, defaultTranscodeBitrate) {
		_root = root;

		_elems.audio = document.getElementById("lms-mp-audio");
		_elems.playpause = document.getElementById("lms-mp-playpause");
		_elems.previous = document.getElementById("lms-mp-previous");
		_elems.next = document.getElementById("lms-mp-next");
		_elems.progress = document.getElementById("lms-mp-progress");
		_elems.seek = document.getElementById("lms-mp-seek");
		_elems.curtime = document.getElementById("lms-mp-curtime");
		_elems.duration = document.getElementById("lms-mp-duration");
		_elems.volume = document.getElementById("lms-mp-volume");
		_elems.volumeslider = document.getElementById("lms-mp-volume-slider");

		_elems.playpause.addEventListener("click", function() {
			if (_elems.audio.paused) {
				if (_elems.audio.firstChild)
					_playTrack();
			}
			else
				_elems.audio.pause();
		});

		_elems.previous.addEventListener("click", function() {
			_requestPreviousTrack();
		});
		_elems.next.addEventListener("click", function() {
			_requestNextTrack();
		});
		_elems.seek.addEventListener("change", function() {
			let mode = _getAudioMode();
			if (!mode)
				return;

			let selectedOffset = parseInt(_elems.seek.value, 10);

			switch (mode) {
				case Mode.Transcode:
					_offset = selectedOffset;
					_removeAudioSources();
					_addAudioSource(_audioTranscodeSrc + "&offset=" + _offset);
					_elems.audio.load();
					_elems.audio.currentTime = 0;
					_playTrack();
					break;

				case Mode.File:
					_elems.audio.currentTime = selectedOffset;
					_playTrack();
					break;
			}
		});

		_elems.audio.addEventListener("play", _updateControls);
		_elems.audio.addEventListener("playing", _updateControls);
		_elems.audio.addEventListener("pause", _updateControls);

		_elems.audio.addEventListener("timeupdate", function() {
			_elems.progress.style.width = "" + ((_offset + _elems.audio.currentTime) / _duration) * 100 + "%";
			_elems.curtime.innerHTML = _durationToString(_offset + _elems.audio.currentTime);
		});

		_elems.audio.addEventListener("ended", function() {
			Wt.emit(_root, "playbackEnded");
		});

		_initVolume();
		_initTranscodeSettings(defaultTranscodeMode, defaultTranscodeFormat, defaultTranscodeBitrate);

		_elems.volumeslider.addEventListener("input", function() {
			_setVolume(_elems.volumeslider.value);
		});

		_elems.volume.addEventListener("click", function () {
			if (_elems.audio.volume != 0) {
				_setVolume(0);
			}
			else {
				_setVolume(_elems.lastvolume);
			}
		});

		if ('mediaSession' in navigator) {
			navigator.mediaSession.setActionHandler("previoustrack", function() {
				_requestPreviousTrack();
			});
			navigator.mediaSession.setActionHandler("nexttrack", function() {
				_requestNextTrack();
			});
		}

	}

	var _removeAudioSources = function() {
		while ( _elems.audio.lastElementChild) {
			_elems.audio.removeChild( _elems.audio.lastElementChild);
		}
	}

	var _addAudioSource = function(audioSrc) {
		let source = document.createElement('source');
		source.src = audioSrc;
		_elems.audio.appendChild(source);
	}

	var _getAudioMode = function() {
		if (_elems.audio.currentSrc) {
			if (_elems.audio.currentSrc.includes("format"))
				return Mode.Transcode;
			else
				return Mode.File;
		}
		else
			return undefined;
	}

	var loadTrack = function(params, autoplay) {
		_offset = 0;
		_duration = params.duration;
		_audioNativeSrc = params.native_resource;
		_audioTranscodeSrc = params.transcode_resource + "&bitrate=" + _transcodeBitrate + "&format=" + _transcodeFormat;

		_elems.seek.max = _duration;

		_removeAudioSources();
		// ! order is important
		if (_transcodeMode == TranscodeMode.Never || _transcodeMode == TranscodeMode.IfFormatNotSupported)
		{
			_addAudioSource(_audioNativeSrc);
		}
		if (_transcodeMode == TranscodeMode.Always || _transcodeMode == TranscodeMode.IfFormatNotSupported)
		{
			_addAudioSource(_audioTranscodeSrc);
		}

		_elems.audio.load();

		_elems.curtime.innerHTML = _durationToString(_offset);
		_elems.duration.innerHTML = _durationToString(_duration);

		if (autoplay)
			_playTrack();

		if ('mediaSession' in navigator) {
			navigator.mediaSession.metadata = new MediaMetadata({
				title: params.title,
				artist: params.artist,
				album: params.release,
				artwork: params.artwork,
			});
		}
	}

	var stop = function() {
		_elems.audio.pause();
	}

	var setSettings = function(transcodeMode, transcodeFormat, transcodeBitrate) {
		_transcodeMode = transcodeMode;
		_transcodeFormat = transcodeFormat;
		_transcodeBitrate = transcodeBitrate;

		if (typeof(Storage) !== "undefined") {
			localStorage.transcodeMode = _transcodeMode;
			localStorage.transcodeFormat = _transcodeFormat;
			localStorage.transcodeBitrate = _transcodeBitrate;
		}
	}

	return {
		init: init,
		loadTrack: loadTrack,
		stop: stop,
		setSettings: setSettings,
	};
}();

// @license-end