let gstate = "idle";
let repeat = false;
let continuelist = true;
let queue = [];
let total = 0;
let index = 0;

let sound = new Howl({
	src: [''],
	format: "mp3",
	html5: true
});

setInterval(function () {
	updateState();
}, 1000);

window.onload = function () {
	initState();
	updateState()
};

window.onkeyup = function (event) {
	switch (event.key) {
		case " ":
		case "p":
			if (gstate == "idle" && total !== 0) {
				playSong(queue[0])
			} else {
				togglePlayback();
			}
			break;

		case "r":
			toggleRepeat();
			break;

		case "c":
			toggleContinue();
			break;

		case "ArrowUp":
			previousTrack();
			break;

		case "ArrowDown":
			nextTrack();
			break;

		case "ArrowLeft":
			if (sound.seek() < 10) {
				sound.seek(0);
			} else {
				sound.seek(sound.seek()-10);
			}
			break;

		case "ArrowRight":
			sound.seek(sound.seek()+10);
			break;

		case "Escape":
			document.getElementById("back").click();
			break;
	}
};


function togglePlayback() {
	if (sound.playing()) {
		sound.pause();
	} else {
		sound.play();
	}
}

function setState(state) {
	gstate = state;

	console.log("now in state: " + state);
	updateState();
}


function playSong(url) {
	if (document.getElementsByClassName("playing").length > 0) {
		document.getElementsByClassName("playing")[0].classList.remove("playing");
	}

	index = queue.indexOf(url);
	sound.stop();
	sound.unload();
	sound = null;
	delete sound;

	sound = new Howl({
		src: [url],
		html5: true
	});

	setState("loading");
	sound.play();
	sound.loop(repeat);
	
	document.querySelectorAll('[onclick="playSong(\''+url+'\')"]')[0].classList.add("playing");

	sound.on("play", function () {
		setState("playing");
	});
	sound.on("loaderror", function () {
		setState("error loading track")
	});
	sound.on("playerror", function () {
		setState("error opening audio device")
	});
	sound.on("end", function () {
		setState("idle");
		nextTrack()
	});
	sound.on("pause", function () {
		setState("paused")
	});
}

function toggleRepeat() {
	repeat = !repeat;
	continuelist = !repeat;
	sound.loop(repeat);
	updateState();
}

function toggleContinue() {
	continuelist = !continuelist;
	updateState();
}

function updateState() {
	document.getElementById("state").setAttribute('onclick', 'togglePlayback()');
	let statestr = "[";
	statestr += gstate;
	if (sound.playing()) {
		statestr += " " + formatTime(Math.round(sound.seek())) + "/" + formatTime(Math.round(sound.duration()));
	}

	statestr += "]";
	document.getElementById("state").innerHTML = statestr;
	let flags = "[";
	if (repeat)
		flags += '<a onclick="toggleRepeat()" href="#" style="color:#6b9969">R</a>';
	else
		flags += '<a onclick="toggleRepeat()" href="#">R</a>';
	if (continuelist)
		flags += '<a onclick="toggleContinue()" href="#" style="color:#6b9969">C</a>';
	else
		flags += '<a onclick="toggleContinue()" href="#">C</a>';

	document.getElementById("flags").innerHTML = flags + "]";
}

function initState() {
	total = queue.length;
}

function previousTrack() {
	if (index-- === 0) index = total-1;

	if (continuelist) {
		playSong(queue[index])
	}
}

function nextTrack() {
	if (++index === total) index = 0;

	if (continuelist) {
		playSong(queue[index])
	}
}

function formatTime(secs) {
	const minutes = Math.floor(secs / 60) || 0;
	const seconds = (secs - minutes * 60) || 0;
	return minutes + ':' + (seconds < 10 ? '0' : '') + seconds;
}