var current_id = '';
var player;
var litColor = '#eee';
var dimmedColor = '#555';
var interval;
var timestamp = '-1';

$(document).ready(function () {
	$('body').click(function (e) {
		if (e.target.id !== 'results') {
			$('#results').slideUp(100);
		}
	});
	var userElem = $('#user');
	if (localStorage['user'] && localStorage['user'].length > 0)
		userElem.val(localStorage['user']);
	userElem.change(function () {
		localStorage['user'] = userElem.val();
	});
	getUpdates();
});

function getUpdates() {
	$.ajax({
		url: '/poll/',
		dataType: 'json',
		data: {pid: pid, timestamp: timestamp},
		success: handleUpdates,
		error: function (_, textStatus) {
			switch (textStatus) {
			case 'abort':
				return;
			case 'error':
			case 'parsererror':
				setTimeout(getUpdates, 1000);
				return;
			default:
				getUpdates();
			}
		}
	});
}

function handleUpdates(data) {
	var updates = [];
	for (var i = 0; i < data.length; i++) {
		timestamp = data[i].Timestamp;
		var update = {
				'action': data[i].Action,
				'yid': data[i].Song.Yid,
				'title': data[i].Song.Title,
				'user': data[i].Song.User
			}
		switch (update.action) {
		case 0: // see updates.go:addAction
			drawAdd(update);
			break;
		case 1:
			drawRemove(update.yid);
			break;
		case 2:
		case 3:
			drawMove(update.yid, update.action);
			break;
		}
	}
	if (timestamp == '-1')
		timestamp = '0';
	getUpdates();
}

function drawBar(id) {
	var canvas = document.getElementById('c_' + id);
	if (!canvas) return;
	canvas.height = canvas.height; //clear

	if (current_id == id && player) {
		var context = canvas.getContext("2d");
		context.fillStyle = dimmedColor;
		context.fillRect(0, 9, 700, 2);
		var loaded_start = player.getVideoStartBytes() / player.getVideoBytesTotal() * 700,
		    loaded_length = player.getVideoBytesLoaded() / player.getVideoBytesTotal() * 700;
		context.fillStyle = litColor;
		context.fillRect(loaded_start, 9, loaded_length, 2);

		var current_time = player.getVideoStartBytes() + player.getCurrentTime(),
		    current_pos = current_time / player.getDuration() * 690 + 5;
		context.beginPath();
		context.arc(current_pos, 10, 5, 0, Math.PI * 2, false);
		context.closePath();
		context.fill();
	}
}

// function name is defined by youtube player api
function onYouTubePlayerReady(playerId) {
	player = document.getElementById('player');
	player.addEventListener('onStateChange', 'onStateChange');
}

function onStateChange(state) {
	switch (state) {
	case 1: //playing
		interval = setInterval(drawBar, 100, current_id);
		break;
	case 0: //ended
		clearInterval(interval);
		showPlay(current_id);
		var songs = $('article section.song');
		for (var i = 0; i < songs.length - 1; i++) {
			if (songs[i].id == current_id) {
				play(songs[i+1].id);
				break;
			}
		}
	case -1: //unstarted
	case 2: //paused
	case 3: //buffering
	case 5: //cued
		clearInterval(interval);
	}
}

function play(yid) {
	if (current_id != yid) {
		player.loadVideoById(yid, 0, 'hd720');
		var previous_id = current_id;
		current_id = yid;
		drawBar(previous_id);
	}
	if (player.getPlayerState() in {'-1':1, '0':1, '5':1}) { // unstarted, ended, cued
		player.seekTo(0, true);
	}
	player.playVideo();
	var songs = $('article section.song');
	for (var i = 0; i < songs.length; i++) {
		if (songs[i].id == yid)
			showPause(songs[i].id);
		else
			showPlay(songs[i].id);
	}
}
function pause(yid) {
	if (current_id != yid)
		return
	player.pauseVideo();
	showPlay(yid);
}
function stop(yid) {
	if (current_id != yid)
		return
	player.stopVideo();
	showPlay(yid);
	drawBar(yid);
}

function showPlay(yid) {
	var play = document.getElementById('play_' + yid);
	var pause = document.getElementById('pause_' + yid);
	if (play)
		play.style.display = 'inline';
	if (pause)
		pause.style.display = 'none';
}
function showPause(yid) {
	var pause = document.getElementById('pause_' + yid);
	var play = document.getElementById('play_' + yid);
	if (pause)
		pause.style.display = 'inline';
	if (play)
		play.style.display = 'none';
}

function search(query) {
	params = {
		q: query,
		'max-results': 10,
		v: 2,
		strict: true,
		alt: 'json',
		fields: 'entry(title,media:group(yt:videoid))',
		safeSearch: 'none',
		key: 'AI39si7SaaRqtvAZTa8lePOq6XC5r7S5Xzp3AB6oYPfeCArPbA4dIq7tSVeuIDwAkcFFDeI3rzNmYxkyN_fg8X_7w800pIvVOA'
	}
	$.getJSON('https://gdata.youtube.com/feeds/api/videos', params,
		function (data) {
			$('#results ul li').remove();
			var results = $('#results ul');
			var entries = data.feed.entry;
			for (var i = 0; i < entries.length; i++) {
				var title = entries[i].title.$t;
				var escapedTitle = title.replace(/'/g, "\\'").replace(/"/g, '\\"');
				var id = entries[i].media$group.yt$videoid.$t;
				var li = $(document.createElement('li'))
						.attr('id', 'r_' + id)
						.append($(document.createElement('a'))
								.attr('href', "javascript:add('" + id + "', '" + escapedTitle + "')")
								.append($(document.createElement('img'))
										.attr('src', 'http://i.ytimg.com/vi/' + id  + '/1.jpg')
										.attr('alt', id))
								.append(title));
				results.append(li);
			}
			$('#results').slideDown(100);
		}
	);
	return false;
}

function userKeyPress(e) {
	if (e.keyCode == 13) {// enter
		$('#song').focus();
		return false;
	}
}

function add(id, title) {
	params = {
		pid: pid,
		yid: id,
		title: title,
		user: $('#user').val()
	}
	$.getJSON('/add/', params);
}

function drawAdd(s) {
	$('article').append($(document.createElement('section'))
			.addClass('song').attr('id', s.yid)
			.append($(document.createElement('div'))
					.addClass('thumb')
					.append($(document.createElement('img'))
							.attr('src', 'http://i.ytimg.com/vi/' + s.yid + '/1.jpg')
							.attr('alt', s.yid)
					)
				)
			.append($(document.createElement('div'))
					.addClass('info')
					.append($(document.createElement('a'))
							.attr('href', 'http://www.youtube.com/watch?v=' + s.yid)
							.append(s.title)
						)
				)
			.append($(document.createElement('div'))
					.addClass('user')
					.append(s.user)
				)
			.append($(document.createElement('div'))
					.addClass('remove')
					.append($(document.createElement('a'))
							.attr('href', 'javascript:remove("' + s.yid + '")')
							.append($(document.createElement('img'))
									.attr('src', '/static/remove.png')
									.attr('alt', 'remove')
								)
						)
				)
			.append($(document.createElement('div'))
					.addClass('reorder')
					.append($(document.createElement('a'))
							.attr('href', 'javascript:move("' + s.yid + '", 2)')
							.append($(document.createElement('img'))
									.attr('src', '/static/up-arrow.png')
									.attr('alt', 'up')
								)
						)
					.append($(document.createElement('a'))
							.attr('href', 'javascript:move("' + s.yid + '", 3)')
							.append($(document.createElement('img'))
									.attr('src', '/static/down-arrow.png')
									.attr('alt', 'down')
								)
						)
				)
			.append($(document.createElement('br')))
			.append($(document.createElement('img'))
					.attr('src', '/static/player_play.png')
					.attr('alt', 'play')
					.attr('id', 'play_' + s.yid)
					.click(function() {play(s.yid)})
				)
			.append($(document.createElement('img'))
					.attr('src', '/static/player_pause.png')
					.attr('alt', 'pause')
					.attr('id', 'pause_' + s.yid)
					.click(function() {pause(s.yid)})
				)
			.append($(document.createElement('img'))
					.attr('src', '/static/player_stop.png')
					.attr('alt', 'stop')
					.click(function() {stop(s.yid)})
				)
			.append($(document.createElement('canvas'))
					.attr('id', 'c_' + s.yid)
					.attr('width', 700)
					.attr('height', 20)
				)
			.append($(document.createElement('br'))
					.addClass('clear')
				)
			);
}

function remove(id) {
	params = {
		pid: pid,
		yid: id,
	}
	$.getJSON('/remove/', params);
}

function drawRemove(id) {
	var element = $('#' + id);
	stop(id);
	element.slideUp(100, function () {
		element.remove();
	});
}

function move(id, dir) {
	params = {
		pid: pid,
		yid: id,
		direction: dir // see updates.go:moveUpAction
	}
	$.getJSON('/move/', params);
}

function drawMove(id, dir) {
	var element1 = document.getElementById(id);
	if (dir == 2) { //up
		var element2 = element1.previousElementSibling;
		if (!element2) return;
		element1 = $('#' + id);
		element2 = $('#' + element2.id);
		element1.fadeOut(200, function () {
			element2.before(element1);
			element1.fadeIn(200);
		});
	} else if (dir == 3) { //down
		var element2 = element1.nextElementSibling;
		if (!element2) return;
		element1 = $('#' + id);
		element2 = $('#' + element2.id);
		element1.fadeOut(200, function () {
			element2.after(element1);
			element1.fadeIn(200);
		});
	}
}