audio = null;
playlist = null;

// pre-load some icons
cache_images = new Array(
	'music-cached.png',
	'music-queued.png',
	'loading.gif'
);
var img = new Image();
for(var i = 0; i < cache_images.length; i++) {
	img.src = '/static/icons/' + cache_images[i];
}

function MusicListing(type, path, name, cached) {
	this.type = type;
	this.path = path;
	this.name = name ? name : path.split('/').pop();
	this.a = document.createElement('a');
	this.a.tag = path;
	this.a.ml = this;

	this.play = function() {
		log('playing ' + path);
		xmlhttp = new XMLHttpRequest();
		xmlhttp.open('GET', '/play?path=' + encodeURIComponent(path));
		xmlhttp.send(null);
	}

	this.recode = function() {
		var path = '/recode?path=' + encodeURIComponent(this.path);
		var a = this.a;
		var ml = this;
		var xmlhttp = new XMLHttpRequest();
		a.setAttribute('class', 'file file-queued');
		xmlhttp.open('GET', path);
		xmlhttp.send(null);
	}

	this.get_anchor = function() {
		var a = this.a;
		var className = type;
		if(cached)
			className += ' file-cached'
		a.setAttribute('class', className);
		a.setAttribute('href', '#');
		a.appendChild(document.createTextNode(this.name));
		var ml = this;

		a.onclick = function() {
			if(type == 'dir') {
				list(path);
			} else if(type == 'file') {
				playlist.add(ml);
			}
			return false;
		}
		return a;
	}
}

function set_current(path) {
	document.getElementById('current-dir').innerHTML = 'Directory: ' + path;
}

function log(s) {
	logbox = document.getElementById('logbox');
	logbox.value += s + '\n';
	logbox.scrollTop = logbox.scrollHeight;
}

function change_url(url) {
	audio.set_src(url);

	var audio_src_url = document.getElementById('audio-src-url');
	audio_src_url.innerHTML = 'Playing: ' + url.replace('&', '&amp;');
}

function output_link(obj) {
	var a = obj.get_anchor();

	var li = document.createElement('li');
	li.appendChild(a);

	var song_links = document.getElementById('song-links');
	song_links.appendChild(li);
}

function list(root) {
	log('listing ' + root);
	var xmlhttp = new XMLHttpRequest();
	xmlhttp.onreadystatechange = function() {
		if(xmlhttp.readyState == 4) {
			set_current(root);
			var json = JSON.parse(xmlhttp.responseText);
			document.getElementById('song-links').innerHTML = '';
			// add "up" link
			if(root.length > 1) {
				up = root.substr(0, root.lastIndexOf('/'));
				if(up.length == 0)
					up = '/';
				l = new MusicListing('dir', up, '..');
				output_link(l);
			}
			for(var i = 0; i < json.length; i++) {
				var type = json[i]["type"];
				var path = json[i]["name"];
				var name = path.substring(path.lastIndexOf('/')+1);
				var cached = type == "file" ? json[i]["cached"] : false;
				var l = new MusicListing(type, path, name, cached);
				output_link(l);
			}
		}
	}

	path = '/list?directory=' + encodeURIComponent(root);
	xmlhttp.open('GET', path);
	xmlhttp.send();
}

function add_directory() {
	var songs = document.getElementById('song-links').getElementsByTagName('a');
	for(var i = 0; i < songs.length; i++) {
		var a = songs[i];
		log(a);
		var ml = a.ml;
		log(ml);
		if(ml.type && ml.type == 'file')
			playlist.add(ml);
	}
}

var source = null;

function get_a(path) {
	var as = document.getElementsByTagName('a');
	for(var i = 0; i < as.length; i++) {
		var a = as[i];
		if(a.tag == path)
			return a;
	}
}

function event_handler(event) {
	data = JSON.parse(event.data);
	switch(data['type']) {
		case 'cached':
		case 'recoding':
			log('[' + data['type'] + '] ' + data['path']);
			// update directory browser
			var a = get_a(data['path']);
			if(a)
				a.setAttribute('class', 'file file-' + data['type']);
			// update song queue
			var li = playlist.get(data['path']);
			if(li) {
				a = li.getElementsByTagName('a')[0];
				if(data['type'] == 'cached') {
					// play the current song if we were waiting for it
					if(li == playlist.current)
						a.onclick();
					else
						a.setAttribute('class', '');
				} else {
					a.setAttribute('class', 'file-recoding');
				}
			}
			break;
		case 'play':
			log('[play] ' + data['path']);
			change_url(data['path']);
			audio.play();
			break;
		default:
			log('[event] unknown type: ' + data['type']);
	}
}

function event_open() {
	if(source)
		source.close();
	source = new EventSource('/events');
	source.onopen = function() { log('event source opened'); }
	source.onmessage = event_handler;
	source.onerror = function(event) { log('event source error'); }
	log('event source status: ' + source.readyState);
}

window.onload = function() {
	event_open();

	audio = new Audio();
	playlist = new Playlist(document.getElementById('playlist'), audio);
	audio.audio.addEventListener('ended', function() { playlist.next(); });
	list('/');
}