//////////////////////////////////////////////////////////////////////////////////////
//
//  Copyright (c) 2014-present, Egret Technology.
//  All rights reserved.
//  Redistribution and use in source and binary forms, with or without
//  modification, are permitted provided that the following conditions are met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//     * Neither the name of the Egret nor the
//       names of its contributors may be used to endorse or promote products
//       derived from this software without specific prior written permission.
//
//  THIS SOFTWARE IS PROVIDED BY EGRET AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
//  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
//  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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//  EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
//////////////////////////////////////////////////////////////////////////////////////

namespace egret.web {

    /**
     * @private
     * @inheritDoc
     */
    export class HtmlSound extends egret.EventDispatcher implements egret.Sound {
        /**
         * Background music
         * @version Egret 2.4
         * @platform Web,Native
         * @language en_US
         */
        /**
         * 背景音乐
         * @version Egret 2.4
         * @platform Web,Native
         * @language zh_CN
         */
        public static MUSIC:string = "music";

        /**
         * EFFECT
         * @version Egret 2.4
         * @platform Web,Native
         * @language en_US
         */
        /**
         * 音效
         * @version Egret 2.4
         * @platform Web,Native
         * @language zh_CN
         */
        public static EFFECT:string = "effect";

        /**
         * @private
         */
        public type:string;

        /**
         * @private
         */
        private url:string;
        /**
         * @private
         */
        private originAudio:HTMLAudioElement;
        /**
         * @private
         */
        private loaded:boolean = false;

        /**
         * @private
         * @inheritDoc
         */
        constructor() {
            super();
        }

        public get length():number {
            if (this.originAudio) {
                return this.originAudio.duration;
            }

            throw new Error ("sound not loaded!");

            //return 0;
        }

        /**
         * @inheritDoc
         */
        public load(url:string):void {
            let self = this;

            this.url = url;

            if (DEBUG && !url) {
                egret.$error(3002);
            }
            let audio = new Audio(url);
            audio.addEventListener("canplaythrough", onAudioLoaded);
            audio.addEventListener("error", onAudioError);

            let ua:string = navigator.userAgent.toLowerCase();
            if (ua.indexOf("firefox") >= 0) {//火狐兼容
                audio.autoplay = !0;
                audio.muted = true;
            }

            audio.load();
            this.originAudio = audio;
            if(HtmlSound.clearAudios[this.url]) {
                delete HtmlSound.clearAudios[this.url];
            }
            HtmlSound.$recycle(this.url, audio);

            function onAudioLoaded():void {
                removeListeners();
                if (ua.indexOf("firefox") >= 0) {//火狐兼容
                    audio.pause();
                    audio.muted = false;
                }

                self.loaded = true;
                self.dispatchEventWith(egret.Event.COMPLETE);
            }

            function onAudioError():void {
                removeListeners();

                self.dispatchEventWith(egret.IOErrorEvent.IO_ERROR);
            }

            function removeListeners():void {
                audio.removeEventListener("canplaythrough", onAudioLoaded);
                audio.removeEventListener("error", onAudioError);
            }
        }

        /**
         * @inheritDoc
         */
        public play(startTime?:number, loops?:number):SoundChannel {
            startTime = +startTime || 0;
            loops = +loops || 0;

            if (DEBUG && this.loaded == false) {
                egret.$error(1049);
            }

            let audio = HtmlSound.$pop(this.url);
            if (audio == null) {
                audio = <HTMLAudioElement>this.originAudio.cloneNode();
            }
            else {
                //audio.load();
            }
            audio.autoplay = true;

            let channel = new HtmlSoundChannel(audio);
            channel.$url = this.url;
            channel.$loops = loops;
            channel.$startTime = startTime;
            channel.$play();

            sys.$pushSoundChannel(channel);

            return channel;
        }

        /**
         * @inheritDoc
         */
        public close() {
            if (this.loaded == false && this.originAudio)
                this.originAudio.src = "";
            if (this.originAudio)
                this.originAudio = null;
            HtmlSound.$clear(this.url);
        }

        /**
         * @private
         */
        private static audios:Object = {};
        private static clearAudios:Object = {};

        static $clear(url:string):void {
            HtmlSound.clearAudios[url] = true;
            let array:HTMLAudioElement[] = HtmlSound.audios[url];
            if (array) {
                array.length = 0;
            }
        }

        static $pop(url:string):HTMLAudioElement {
            let array:HTMLAudioElement[] = HtmlSound.audios[url];
            if (array && array.length > 0) {
                return array.pop();
            }
            return null;
        }

        static $recycle(url:string, audio:HTMLAudioElement):void {
            if(HtmlSound.clearAudios[url]) {
                return;
            }
            let array:HTMLAudioElement[] = HtmlSound.audios[url];
            if (HtmlSound.audios[url] == null) {
                array = HtmlSound.audios[url] = [];
            }
            array.push(audio);
        }
    }
}