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

	this.get_text = function() {
		if(!metadata)
			return name;
		var s = '';
		if('artist' in metadata)
			s = metadata['artist'] + ' - ';
		if('title' in metadata)
			s += metadata['title'];
		if(s.length > 0 && track)
			s = track + ' ' + s;
		if(s.length == 0)
			s = name;
		return s;
	}

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

	this.recode = function() {
		var path = '/recode?path=' + encodeURIComponent(this.path);
		if(this.track)
			path += '&track=' + this.track;
		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', '#');
		var name = this.get_text();
		a.appendChild(document.createTextNode(name));
		var ml = this;

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

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

function Browser(songs, current, audio) {
	this.songs = songs;
	this.current = current;
	this.audio = audio;

	this.set_current = function(path) {
		this.current.innerHTML = 'Directory: ' + path;
	}

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

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

		this.songs.appendChild(li);
	}

	this.output_album = function(album) {
		var li = document.createElement('li');
		li.setAttribute('class', 'album');
		li.appendChild(document.createTextNode(album ? album : '(No album)'));

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

	this.add_results = function(json) {
		var lastalbum = false;
		for(var i = 0; i < json.length; i++) {
			var type = json[i]["type"];
			var path = json[i]["name"];
			var track = json[i]["track"];
			var name = path.substring(path.lastIndexOf('/')+1);
			var cached = type == "file" ? json[i]["cached"] : false;
			var metadata = json[i]["metadata"];

			if(type == 'file' && metadata.album != lastalbum) {
				this.output_album(metadata.album);
				lastalbum = metadata.album;
			}

			var l = new MusicListing(type, path, name, track, metadata, cached);
			this.output_link(l);
		}
		log('add_results: ' + lastalbum);
	}

	this.list = function(root) {
		var b = this;

		log('listing ' + root);
		var xmlhttp = new XMLHttpRequest();
		xmlhttp.onreadystatechange = function() {
			if(xmlhttp.readyState == 4) {
				b.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, '..');
					b.output_link(l);
				}
				b.add_results(json);
			}
		}

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

	this.do_search = function(e) {
		var b = this;
		if(e.keyCode != 13)
			return;

		var xmlhttp = new XMLHttpRequest();
		xmlhttp.onreadystatechange = function() {
			if(xmlhttp.readyState == 4) {
				var json = JSON.parse(xmlhttp.responseText);
				document.getElementById('song-links').innerHTML = '';
				b.output_link(new MusicListing('dir', '/', 'Go to root directory'));
				b.add_results(json);
			}
		}

		var query = document.getElementById('search-query').value;
		var path = '/search?query=' + encodeURIComponent(query);
		xmlhttp.open('GET', path);
		xmlhttp.send();
	}

	this.add_directory = function() {
		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);
		}
	}

	this.get_a = function(path, track) {
		var as = document.getElementById('song-links').getElementsByTagName('a');
		for(var i = 0; i < as.length; i++) {
			var a = as[i];
			if(a.ml.path == path && (!track || track == a.ml.track))
				return a;
		}
	}
}

var source = null;

function event_handler(event) {
	data = JSON.parse(event.data);
	switch(data['type']) {
		case 'cached':
		case 'recoding':
			log('[' + data['type'] + '] ' + data['path']);
			var track = null;
			if('track' in data)
				track = data['track'];
			log('track: ' + track);
			// update directory browser
			var a = browser.get_a(data['path'], track);
			if(a)
				a.setAttribute('class', 'file file-' + data['type']);
			// update song queue
			var li = playlist.get(data['path'], track);
			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', 'song');
				} else {
					a.setAttribute('class', 'song file-recoding');
				}
			}
			break;
		case 'play':
			log('[play] ' + data['path']);
			browser.audio.set_src(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();

	var song_links = document.getElementById('song-links');
	var current = document.getElementById('current-dir');

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