/*
 * Spreed WebRTC.
 * Copyright (C) 2013-2015 struktur AG
 *
 * This file is part of Spreed WebRTC.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

"use strict";
define(['underscore', 'Howler', 'require'], function(_, Howler, require) {

	// Active initialized sound instances are kept here.
	var registry = {};
	var disabled = {};
	window.PLAYSOUND = registry; // make available for debug.

	// playSound
	return [function() {

		var SoundInterval = function(sound, id, time) {
			this.sound = sound;
			this.id = id;
			this.interval = null;
			this.time = time;
		};
		SoundInterval.prototype.start = function() {
			if (this.interval !== null) {
				return;
			}
			var id = this.id;
			var player = _.bind(function() {
				return this.sound.play(id);
			}, this);
			player();
			this.interval = setInterval(player, this.time);
		};
		SoundInterval.prototype.stop = function() {
			clearInterval(this.interval);
			this.interval = null;
			delete this.sound.intervals[this.id];
		};

		var Sound = function(options, aliases) {

			this.sound = null;
			this.intervals = {};
			if (options) {
				this.initialize(options, aliases);
			}

		};

		Sound.prototype.initialize = function(options, aliases) {

			// Kill all the existing stuff if any.
			if (this.sound) {
				this.sound.stop();
			}
			_.each(this.intervals, function(i) {
				i.stop();
			});
			this.intervals = {};

			// Add error handler.
			var onloaderror = options.onloaderror;
			options.onloaderror = function(event) {
				console.error("Failed to load sounds", event);
				if (onloaderror) {
					onloaderror.apply(this, arguments);
				}
			};

			// Replace urls with their require generated URLs.
			var urls = options.urls;
			if (urls) {
				var new_urls = [];
				_.each(urls, function(u) {
					u = require.toUrl(u);
					new_urls.push(u);
				});
				options.urls = new_urls;
			}

			// Create the new shit.
			this.players = {};
			this.aliases = _.extend({}, aliases);
			this.sound = new Howler.Howl(options);

			return this;

		};

		Sound.prototype.getId = function(id) {

			if (this.aliases.hasOwnProperty(id)) {
				return this.aliases[id];
			}
			return id;

		};

		Sound.prototype.play = function(name, interval, autostart) {

			if (!this.sound) {
				console.log("Play sound but not initialized.", name);
				return null;
			}

			if (interval) {

				if (this.intervals.hasOwnProperty(name)) {
					return this.intervals[name];
				}
				var i = this.intervals[name] = new SoundInterval(this, name, interval);
				if (autostart) {
					i.start();
				}
				return i;

			} else {

				var id = this.getId(name);

				if (!this.shouldPlaySound(name) || !this.shouldPlaySound(id)) {
					return;
				}

				var player = this.players[id];
				var sound = this.sound;
				if (!player) {
					player = this.players[id] = (function(id) {
						var data = {};
						var cb = function(soundId) {
							data.soundId = soundId;
						};
						var play = _.debounce(function() {
							if (data.soundId) {
								sound.stop(data.soundId);
								data.soundId = null;
							}
							sound.play(id, cb);
						}, 10);
						return play;
					}(id));
				}
				player()

			}

		};

		Sound.prototype.shouldPlaySound = function(id) {
			if (disabled.all || disabled.hasOwnProperty(id)) {
				return false;
			}
			return true;
		};

		return {
			initialize: function(options, name, aliases) {
				if (!name) {
					name = null;
				}
				var s = registry[name] = new Sound(options, aliases);
				return s;
			},
			play: function(id, name) {
				if (!name) {
					name = null;
				}
				var s = registry[name];
				if (!s) {
					console.log("Play sound with unknown player", name);
					return null;
				}
				return s.play(id);

			},
			interval: function(id, name, time) {
				if (!name) {
					name = null;
				}
				var s = registry[name];
				if (!s) {
					console.log("Play sound with unknown player", name);
					return null;
				}
				if (!time) {
					time = 1500;
				}
				return s.play(id, time);
			},
			disable: function(id, status) {
				if (status !== false) {
					disabled[id] = true;
				} else {
					delete disabled[id];
				}
			}
		}

	}];

});