/* ===================================================
 * jqlyric.js v0.1
 * shawnk@qq.com

 * 使用方法
 * var $container=$('#lyriccontainer'); //用于显示歌词的容器对象，样式自己定义
 * $container.jqlyric({
 *      lyric:'\
            [ti:存在] \
            [ar:汪峰] \
            [al:存在] \
            [by:Love] \
            [00:00.00]汪峰 - 存在 \
            [00:00.68]多少人走着却困在原地 \
            [00:07.93]多少人活着却如同死去',   // 歌词字符串，标准lrc文件格式
 *      speed:1000,                  // 歌词滚动间隔 (毫秒)
 *      getPosition:function(){      // 获取当前播放位置的函数(返回秒数), 请定义外部函数，不指定本参数则默认从调用插件开始自动播放
 *          return position;
 *      }
 * });

 * ===================================================
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ========================================================== */

(function($) {
    var gtime=0;
    var lyric_listener;
    $.fn.jqlyric = function(options) {
        var opts = $.extend({}, $.fn.jqlyric.defaults, options);

        return this.each(function(){
            var o = $.meta ? $.extend({}, opts, $this.data()) : opts;
            var $this=$(this);

            var arrLyric=new Array();   //放存汉字的歌词
            var arrTime=new Array();    //存放时间
            var currentLine=0;          //当前活动的歌词行号

            // 开始解析歌词
            var lyric=o.lyric;
            lyric=lyric.replace(/\]\n/g,'\]\n\|\|');
            lyric=lyric.replace(/\]\s\[/g,'\]\[');
            lyric=lyric.replace(/\]\[/g,'====');
            lyric=lyric.replace(/\[/g,'\|\|\[');
            lyric=lyric.replace(/====/g,'\]\[');

            lyric=lyric.replace(/\|\|\|\|\|\|\|\|/g,'\|\|');
            lyric=lyric.replace(/\|\|\|\|\|\|/g,'\|\|');
            lyric=lyric.replace(/\|\|\|\|/g,'\|\|');

            
            //将歌词解析成数组
            var arrly=lyric.split('||');

            for(var i=0;i<arrly.length;i++){
                var str=arrly[i];

                var left=0; //"["的个数
                var leftAr=new Array();
                for(var k=0;k<str.length;k++){
                    if(str.charAt(k)=="["){
                        leftAr[left]=k;
                        left++;
                    }
                }

                if(left!=0){
                    for(var j=0;j<leftAr.length;j++){
                        var tag=str.charAt(leftAr[j]+1)+str.charAt(leftAr[j]+2);

                        if(tag=='ti'||tag=='ar'||tag=='by'||tag=='al'){
                            // 歌曲特征字段
                            var tmp=str.split(tag+':');
                            tmp=tmp[1].split(']');
                            var text=tmp[0];
                            tag=tag.replace(/([ti|ar|al|by])/g,'');
                            //arrLyric.push(tag+text);
                            //arrTime.push(toSeconds('00:00:00'));   //
                        }else{
                            var text=str.substring(str.lastIndexOf("]")+1);
                            if(text==''){text='&nbsp;';}
                            arrLyric.push(text);              //放歌词
                            arrTime.push(toSeconds(str.substring(leftAr[j]+1,leftAr[j]+6)));   //放时间       
							
                        }
                    }
                }
            }

            // 所有歌词按时间顺序排列
            for(var k=0;k<arrTime.length;k++){
                for(var j=0;j<arrTime.length-k;j++){
                    if(arrTime[j]>arrTime[j+1]){
                        temp=arrTime[j];
                        arrTime[j]=arrTime[j+1];
                        arrTime[j+1]=temp;

                        temp=arrLyric[j];
                        arrLyric[j]=arrLyric[j+1];
                        arrLyric[j+1]=temp;
                    }
                }
            }
			var arrLyricObj=new Array();
			for(var k=0;k<arrTime.length;k++){
				var timeStart=arrTime[k]?arrTime[k]:0;
				var timeEnd=arrTime[k+1]?arrTime[k+1]-0.01:99999999999999;
				var lrcContent=arrLyric[k];
				
				var lrc={timeStart:timeStart,timeEnd:timeEnd,lrcContent:lrcContent};
				arrLyricObj.push(lrc);
			}
          
            
            clearTimeout(lyric_listener);
			var fadeFinish=true;
			var timeFun=function (){     // 定时检查当前播放进度，作出滚动动作
                var pos=o.getPosition();
				for(var k=0;k<arrLyricObj.length;k++){
					if(pos>=arrLyricObj[k].timeStart&&pos<=arrLyricObj[k].timeEnd){
						if($("#line-current").text()!=arrLyricObj[k].lrcContent&&fadeFinish){
							if(k>0){
								$("#line-last span").fadeOut(1000,function(){
									$("#line-last span").text(arrLyricObj[k-1].lrcContent);
									$("#line-last span").fadeIn(1000);
								});
							}
							if(k<arrTime.length-1){
								$("#line-next span").fadeOut(1000,function(){
									$("#line-next span").text(arrLyricObj[k+1].lrcContent);
									$("#line-next span").fadeIn(1000);
								});
							}
							fadeFinish=false;
							$("#line-current span").fadeOut(1000,function(){
								$("#line-current span").text(arrLyricObj[k].lrcContent);
								$("#line-current span").fadeIn(1000,function(){
									fadeFinish=true;
								});
								
							});
							
							break;
						}
					}
				}
				lyric_listener=setTimeout(timeFun,o.speed);
            };
            lyric_listener=setTimeout(timeFun,o.speed);
        });
    };

    $.fn.jqlyric.defaults={
        lyric:'[00:00.00]未找到歌词',   // 歌词字符串 (lrc格式)
        speed:500,                      // 歌词进度一首歌间隔(毫秒)
        getPosition:function(){         // 获取播放器当前播放位置
            gtime+=0.5;
            return gtime;
        }
    }

    function toSeconds(t){     //把形如：01：25的时间转化成秒；
        var m=t.substring(0,t.indexOf(":"));
        var s=t.substring(t.indexOf(":")+1);
        s=parseInt(s.replace(/\b(0+)/gi,""));
        if(isNaN(s))
            s=0;
        var totalt=parseInt(m)*60+s;
        //alert(parseInt(s.replace(/\b(0+)/gi,"")));
        if(isNaN(totalt))
            return 0;
        return totalt;
    }

})(jQuery);

$(function() { 
  var audio=document.getElementById("audio");
  var fun_getPosition=function(){
	return audio.currentTime;
  } 
  var url=audio.currentSrc;
  var urlArr = url.split('?');
  var k = urlArr[0], appU = k.split('/');
  var srcFileExt = appU[appU.length - 1].split('.')[1];
  url=url.replace("."+srcFileExt,".lrc");
  var url = "http://122.114.50.251:8010/getJSON.php?callback=?&url="+(url);  
  
  $.getJSON(url, function(data){  
	var lrcContent=data.data;
	if(!lrcContent||lrcContent==""){
		return;
	}
	var $container=$('#lyriccontainer'); //用于显示歌词的容器对象，样式自己定义
	$container.jqlyric({
		  lyric:lrcContent,   // 歌词字符串，标准lrc文件格式
		  getPosition:fun_getPosition
	});
  }); 	
});