/**
 *
 * 浮动广告js插件
 * w 广告宽度
 * h 广告高度
 * x 广告横坐标 auto时移动显示
 * y 广告纵坐标 auto时移动显示
 * imgsrc 图片路径
 * url 广告地址
 * isfloat 是否浮动
 * basepoint x坐标的基准点(1 左，2中，3右)
 * showclosebutton 是否显示关闭按钮
 *
 */
function advertise(w,h,x,y,imgsrc,url,isfloat,basepoint,showclosebutton) {
    this._w = w;
    this._h = h;
    this._x = x.tolowercase();
    this._y = y.tolowercase();
    this._imgsrc = imgsrc;
    this._url = url;
    this.uid = advertisehelper.getid();
    this.mbox = null;
    this._movertype = 0;//0 不移动
    this._isfloat = isfloat;
    this._bp = basepoint;
    this._showcb = showclosebutton;
    this.steep=50;
    advertisehelper.instance[this.uid] = this;

}
advertise.prototype = {
    _createbox : function () {
        if(!document.getelementbyid(this.uid+"_mbox")){
            var box = document.createelement("div");
            box.id = this.uid+"mbox";
            box.style.cursor = "pointer";
            box.style.position = "absolute";
            box.style.width = this._w+"px";
            box.style.height= this._h+"px";
            box.style.zindex="100000";
            document.body.appendchild(box);
            var boxinhtml = "<a href=\""+this._url+"\" target='_blank'><img border=0 src ='"+this._imgsrc+"' style='width:"+this._w+"px;height:"+this._h+"px;' /></a>";
            //添加关闭按钮
            if(this._showcb){
                var eventstr = "advertisehelper.instance['"+this.uid+"'].close()";
                var btnstyle ='width:23px;height:17px;position:absolute;top:0px;right:0px;background-image:url(/resource/images/close.png)';
                boxinhtml += "<div id='"+this.uid+"_close' title='关闭广告' style='"+btnstyle+"' onclick ="+eventstr+"></div>";
            }
            box.innerhtml=boxinhtml;
            this.mbox = box;
        }else{
            this.mbox = document.getelementbyid(this.uid+"_mbox");
        }
    },
    _static : function () {
        var y = this._y;
        var x = this._x=="auto" ? 0: parseint(this._x);
        if(this._bp == "2") {
            x = (document.documentelement.scrollwidth / 2) + x;
        }else if(this._bp == "3") {
            x = document.documentelement.clientwidth + x ;
        }
        if (this._y == 'auto'){ y = 0; }
        this.mbox.style.left = x+"px";
        this.mbox.style.top = y+"px";
        /*跟随滚动条移动*/
        var uid = this.uid;
        addeventload(window, "scroll", function(){
            advertisehelper.instance[uid]._bodyscroll();
        });

    },
    _float : function () {
        var x = this._x;
        var y = this._y;
        var scrolltop = document.documentelement.scrolltop || window.pageyoffset || document.body.scrolltop;
        var scrollleft = document.documentelement.scrollleft || window.pagexoffset || document.body.scrollleft;
        if (this._x == 'auto' && this._y != 'auto'){
            //横向移动
            this._movertype = 1;
            x = scrollleft;
        } else if (this._y == 'auto' && this._x != 'auto'){
            //纵向移动
            this._movertype = 2;
            y = scrolltop;
        } else {
            //双向移动
            this._movertype = 3;
            x = (math.random() * (document.documentelement.clientwidth-this._w));
            y = (math.random() * (document.documentelement.clientheight-this._h));
        }
        this.mbox.style.left = x+"px";
        this.mbox.style.top = y+"px";

        var uid = this.uid;


        this._mover();
        this.mbox.onmousemove = function(){clearinterval(this.mover);};
        this.mbox.onmouseout  = function(){ advertisehelper.instance[uid]._mover();};
        var uid = this.uid;
         addeventload(window, "scroll", function(){
            advertisehelper.instance[uid]._bodyscroll();
         });

    },
    _bodyscroll : function () {
        if(this.mbox.style.display == "none"){return;}
        var scrolltop  = document.documentelement.scrolltop  || window.pageyoffset || document.body.scrolltop;
        var scrollleft = document.documentelement.scrollleft || window.pagexoffset || document.body.scrollleft;
        var top = left = "";
        if(!this.mbox._isfloat && this._bp!="2"){
            if(!this.oldscrolltop){this.oldscrolltop = 0;}
            if(!this.oldscrollleft){this.oldscrollleft = 0;}
            top = (this.mbox.offsettop + scrolltop - this.oldscrolltop);
            left = (this.mbox.offsetleft + scrollleft  - this.oldscrollleft);
           this.mbox.style.top = top+"px";
            this.mbox.style.left = left+"px";
            this.oldscrolltop = scrolltop;
            this.oldscrollleft = scrollleft;
        } else {
            top = (this._y == "auto" ? 0 : parseint(this._y)) + (scrolltop);
            this.moveelement(this.mbox.id,"",top,10);
        }

    },
    _mover : function () {
        if(this.mbox.mover){clearinterval(this.mbox.mover)}
        if(this._movertype==0){return;}

        var scrolltop = document.documentelement.scrolltop || window.pageyoffset || document.body.scrolltop;
        var scrollleft = document.documentelement.scrollleft || window.pagexoffset || document.body.scrollleft;
        var x = this.mbox.offsetleft;
        var y = this.mbox.offsettop ;
        if(this._movertype==3 || this._movertype == 1){
            if(x + this._w >=  document.documentelement.clientwidth + scrollleft - 5 ){ this.isxjia = false; }
            else if(x == scrollleft ){this.isxjia = true;}
            x = this.isxjia ? x+1 : x-1;
        }
        if(this._movertype==3 || this._movertype == 2){
            if(y + this._h >= document.documentelement.clientheight + scrolltop - 5 && y + this._h >=0 ){ this.isyjia = false; }
            else if( y == scrolltop){this.isyjia = true;}
            y = this.isyjia ? y+1 : y-1;
        }

        this.mbox.style.left = (x) + "px";
        this.mbox.style.top = (y) + "px";
        this.mbox.mover = setinterval("advertisehelper.instance['"+this.uid+"']._mover()",this.steep);
    },
    close : function () {
        if(this.mbox.mover){clearinterval(this.mbox.mover)}
        this.mbox.style.display="none";
    },
    show : function () {
        this._createbox();
        if(this._isfloat)
            this._float();
        else
            this._static();
    },
    moveelement : function (elementid, final_x,final_y,interval) {
        if (!document.getelementbyid(elementid)) {return false; }
        var elem = document.getelementbyid(elementid);
        if (elem.movement) { clearinterval(elem.movement);}
        if (!elem.style.top) { elem.style.top = "0px"; }
        if (!elem.style.left) { elem.style.left = "0px"; }

        if(final_x != ""){
            var xpos = parseint(elem.style.left);
            if (xpos < final_x) { var dist = math.ceil((final_x - xpos)/10); xpos = xpos + dist; }
            if (xpos > final_x) { var dist = math.ceil((xpos - final_x)/10); xpos = xpos - dist; }
             elem.style.left = xpos + "px";
        }
        if(final_y != ""){
            var ypos = parseint(elem.style.top);
            if (ypos < final_y) { var dist = math.ceil((final_y - ypos)/10); ypos = ypos + dist; }
            if (ypos > final_y) { var dist = math.ceil((ypos - final_y)/10); ypos = ypos - dist; }
            elem.style.top = ypos + "px";
        }
        if (xpos == final_x && ypos == final_y) {
            return true;
        }
        var eventstr = "advertisehelper.instance['"+this.uid+"']";

        var repeat = eventstr + ".moveelement('"+elementid+"','"+final_x+"','"+final_y+"',"+interval+")";
        elem.movement = setinterval(repeat,interval);
    }
}
var advertisehelper = {
    count: 0,
    instance: {},
    getid: function() { return '_advertise-' + (this.count++); }

};
function addeventload(target, type, func){
    if (target.addeventlistener) target.addeventlistener(type, func, true);
    else if (target.attachevent) target.attachevent("on" + type, func);
    else target["on" + type] = func;
}