$(document).ready(function(){
  (function($){
    /*
     图片滚动效果
     @object config : {
     @number width : 一次滚动宽度，默认为box里面第一个一级子元素宽度[如果子元素宽度不均匀则滚动效果会错乱]
     @number size : 列表长度，默认为box里面所有一级子元素个数[如果size不等于一级子元素个数，则不支持循环滚动]
     @boolean loop : 是否支持循环滚动 默认 true
     @boolean auto : 是否自动滚动,支持自动滚动时必须支持循环滚动，否则设置无效,默认为true
     @number auto_wait_time : 自动轮播一次时间间隔,默认为：3000ms
     @function callback : 滚动完回调函数，参入一个参数当前滚动节点索引值
     }
     */
    function mggscrollimg(box,config){
      this.box = $(box);
      this.config = $.extend({},config||{});
      this.width = this.config.width||this.box.children().eq(0).width();//一次滚动的宽度
      this.size = this.config.size||this.box.children().length;
      this.loop = this.config.loop||true;//默认能循环滚动
      this.auto = this.config.auto||false;//默认自动滚动
      this.auto_wait_time = this.config.auto_wait_time||3000;//轮播间隔
      this.scroll_time = 600;//滚动时长
      this.minleft = -this.width*(this.size-1);//最小left值，注意是负数[不循环情况下的值]
      this.maxleft =0;//最大lfet值[不循环情况下的值]
      this.now_left = 0;//初始位置信息[不循环情况下的值]
      this.point_x = null;//记录一个x坐标
      this.point_y = null;//记录一个y坐标
      this.move_left = false;//记录向哪边滑动
      this.index = 0;
      this.busy = false;
      this.timer;
      this.init();
    }
    $.extend(mggscrollimg.prototype,{
      init : function(){
        this.bind_event();
        this.init_loop();
        this.auto_scroll();
      },
      bind_event : function(){
        var self = this;
        self.box.on('touchstart',function(e){
          if(e.touches.length==1 && !self.busy){
            self.point_x = e.touches[0].screenx;
            self.point_y = e.touches[0].screeny;
          }
        }).on('touchmove',function(e){
          if(e.touches.length==1 && !self.busy){
            return self.move(e.touches[0].screenx,e.touches[0].screeny);//这里根据返回值觉得是否阻止默认touch事件
          }
        }).on('touchend',function(e){
          !self.busy && self.move_end();
        });
      },
      /*
       初始化循环滚动,当一次性需要滚动多个子元素时，暂不支持循环滚动效果,
       如果想实现一次性滚动多个子元素效果，可以通过页面结构实现
       循环滚动思路：复制首尾节点到尾首
       */
      init_loop : function(){
        if(this.box.children().length == this.size && this.loop){//暂时只支持size和子节点数相等情况的循环
          this.now_left = -this.width;//设置初始位置信息
          this.minleft = -this.width*this.size;//最小left值
          this.maxleft = -this.width;
          this.box.prepend(this.box.children().eq(this.size-1).clone()).append(this.box.children().eq(1).clone()).css(this.get_style(2));
          this.box.css('width',this.width*(this.size+2));
        }else{
          this.loop = false;
          this.box.css('width',this.width*this.size);
        }
      },
      auto_scroll : function(){//自动滚动
        var self = this;
        if(!self.loop || !self.auto)return;
        cleartimeout(self.timer);
        self.timer = settimeout(function(){
          self.go_index(self.index+1);
        },self.auto_wait_time);
      },
      stop : function(){
        var self = this;
        cleartimeout(self.timer);
      },
      play : function(){
        var self = this;
        self.auto_scroll();
      },
      go_index : function(ind){//滚动到指定索引页面
        var self = this;
        if(self.busy)return;
        cleartimeout(self.timer);
        self.busy = true;
        if(self.loop){//如果循环
          ind = ind<0?-1:ind;
          ind = ind>self.size?self.size:ind;
        }else{
          ind = ind<0?0:ind;
          ind = ind>=self.size?(self.size-1):ind;
        }
        if(!self.loop && (self.now_left == -(self.width*ind))){
          self.complete(ind);
        }else if(self.loop && (self.now_left == -self.width*(ind+1))){
          self.complete(ind);
        }else{
          if(ind == -1 || ind == self.size){//循环滚动边界
            self.index = ind==-1?(self.size-1):0;
            self.now_left = ind==-1?0:-self.width*(self.size+1);
          }else{
            self.index = ind;
            self.now_left = -(self.width*(self.index+(self.loop?1:0)));
          }
          self.box.css(this.get_style(1));
          settimeout(function(){
            self.complete(ind);
          },self.scroll_time);
        }
      },
      complete : function(ind){//动画完成回调
        var self = this;
        self.busy = false;
        self.config.callback && self.config.callback(self.index);
        if(ind==-1){
          self.now_left = self.minleft;
        }else if(ind==self.size){
          self.now_left = self.maxleft;
        }
        self.box.css(this.get_style(2));
        self.auto_scroll();
      },
      next : function(){//下一页滚动
        if(!this.busy){
          this.go_index(this.index+1);
        }
      },
      prev : function(){//上一页滚动
        if(!this.busy){
          this.go_index(this.index-1);
        }
      },
      move : function(point_x,point_y){//滑动屏幕处理函数
        var changex = point_x - (this.point_x===null?point_x:this.point_x),
          changey = point_y - (this.point_y===null?point_y:this.point_y),
          marginleft = this.now_left, return_value = false,
          sin =changey/math.sqrt(changex*changex+changey*changey);
        this.now_left = marginleft+changex;
        this.move_left = changex<0;
        if(sin>math.sin(math.pi/3) || sin<-math.sin(math.pi/3)){//滑动屏幕角度范围：pi/3  -- 2pi/3
          return_value = true;//不阻止默认行为
        }
        this.point_x = point_x;
        this.point_y = point_y;
        this.box.css(this.get_style(2));
        return return_value;
      },
      move_end : function(){
        var changex = this.now_left%this.width,ind;
        if(this.now_left<this.minleft){//手指向左滑动
          ind = this.index +1;
        }else if(this.now_left>this.maxleft){//手指向右滑动
          ind = this.index-1;
        }else if(changex!=0){
          if(this.move_left){//手指向左滑动
            ind = this.index+1;
          }else{//手指向右滑动
            ind = this.index-1;
          }
        }else{
          ind = this.index;
        }
        this.point_x = this.point_y = null;
        this.go_index(ind);
      },
      /*
       获取动画样式，要兼容更多浏览器，可以扩展该方法
       @int fig : 1 动画 2  没动画
       */
      get_style : function(fig){
        var x = this.now_left ,
          time = fig==1?this.scroll_time:0;
        return {
          '-webkit-transition':'-webkit-transform '+time+'ms',
          '-webkit-transform':'translate3d('+x+'px,0,0)',
          '-webkit-backface-visibility': 'hidden',
          'transition':'transform '+time+'ms',
          'transform':'translate3d('+x+'px,0,0)'
        };
      }
    });
    /*
     这里对外提供调用接口，对外提供接口方法
     next ：下一页
     prev ：上一页
     go ：滚动到指定页
     */
    $.mggscrollimg = function(box,config){
      var scrollimg = new mggscrollimg(box,config);
      return {//对外提供接口
        next : function(){scrollimg.next();},
        prev : function(){scrollimg.prev();},
        stop : function(){scrollimg.stop();},
        play : function(){scrollimg.play();},
        go : function(ind){scrollimg.go_index(parseint(ind)||0);}
      }
    }
  })($)
  /*初始化*/
  var tabbox = [];
  for(var i=0;i<$('.tab li').length;i++){
    tabbox[i] = 'scroll'+i;
  }
  for(var j=0;j<tabbox.length;j++){
    var n = j+1;
    tabbox[j] = $.mggscrollimg('.tabbox'+n,{
      auto : true
    });
  }

  $('.tab li').eq(0).addclass('tabshow');
  $('.tabbox').eq(0).show();
  playslide(0);
  /*tab切换*/
  $('.tab').on('click','.tab li',function(){
    var index = $('.tab li').index($(this));
    $(this).addclass('tabshow').siblings().removeclass('tabshow');
    $('.tabbox').eq(index).show().siblings('.tabbox').hide();
    playslide(index);
  })

  $('.tabmain .btnleft').on('click',function(){
    var index = $('.tab li').index($('.tabshow'))
    tabbox[index].prev();
  })
  $('.tabmain .btnright').on('click',function(){
    var index = $('.tab li').index($('.tabshow'))
    tabbox[index].next();
  })
  function playslide(index){
    for(var i=0;i<tabbox.length;i++){
      tabbox[i].stop();
    }
    tabbox[index].play();
  }
});