var isIE = (document.all) ? true : false;
var isIE6 = isIE && ([/MSIE (\d)\.0/i.exec(navigator.userAgent)][0][1] == 6);

function Each(list, fun) {
    for (var i = 0, len = list.length; i < len; i++) { fun(list[i], i); }
};

var $1 = function(id) {
    return "string" == typeof id ? document.getElementById(id) : id;
};

var Class = {
    create: function() {
        return function() {
            this.initialize.apply(this, arguments);
        }
    }
}

Object.extend = function(destination, source) {
    for (var property in source) {
        destination[property] = source[property];
    }
    return destination;
}

Function.prototype.bind = function(object) {
    var __method = this, args = Array.apply(null, arguments); args.shift();
    return function() {
        return __method.apply(object, args);
    }
}

var OverLay = Class.create();
OverLay.prototype = {
    initialize: function(overlay, options) {
        this.Lay = $1(overlay); //覆盖层

        //ie6设置覆盖层大小程序
        this._size = function() { };

        this.SetOptions(options);

        this.Color = this.options.Color;
        this.Opacity = parseInt(this.options.Opacity);
        this.zIndex = parseInt(this.options.zIndex);

        this.Set();
    },
    //设置默认属性
    SetOptions: function(options) {
        this.options = {//默认值
            Color: "#fff", //背景色
            Opacity: 50, //透明度(0-100)
            zIndex: 1000//层叠顺序
        };
        Object.extend(this.options, options || {});
    },
    //创建
    Set: function() {
        this.Lay.style.display = "none";
        this.Lay.style.zIndex = this.zIndex;
        this.Lay.style.left = this.Lay.style.top = 0;

        if (isIE6) {
            this.Lay.style.position = "absolute";
            this._size = function() {
                this.Lay.style.width = Math.max(document.documentElement.scrollWidth, document.documentElement.clientWidth) + "px";
                this.Lay.style.height = Math.max(document.documentElement.scrollHeight, document.documentElement.clientHeight) + "px";
            } .bind(this);
            //遮盖select
            this.Lay.innerHTML = '<iframe style="position:absolute;top:0;left:0;width:100%;height:100%;filter:alpha(opacity=0);"></iframe>'
        } else {
            this.Lay.style.position = "fixed";
            this.Lay.style.width = this.Lay.style.height = "100%";
        }
    },
    //显示
    Show: function() {
        //设置样式
        this.Lay.style.backgroundColor = this.Color;
        //设置透明度
        if (isIE) {
            this.Lay.style.filter = "alpha(opacity:" + this.Opacity + ")";
        } else {
            this.Lay.style.opacity = this.Opacity / 100;
        }
        //兼容ie6
        if (isIE6) { this._size(); window.attachEvent("onresize", this._size); }

        this.Lay.style.display = "block";
    },
    //关闭
    Close: function() {
        this.Lay.style.display = "none";
        if (isIE6) { window.detachEvent("onresize", this._size); }
    }
};



var LightBox = Class.create();
LightBox.prototype = {
    initialize: function(box, overlay, options) {

        this.Box = $1(box); //显示层

        this.OverLay = new OverLay(overlay, options); //覆盖层

        this.SetOptions(options);

        this.Fixed = !!this.options.Fixed;
        this.Over = !!this.options.Over;
        this.Center = !!this.options.Center;
        this.onShow = this.options.onShow;

        this.Box.style.zIndex = this.OverLay.zIndex + 1;
        this.Box.style.display = "none";

        //兼容ie6用的属性
        if (isIE6) { this._top = this._left = 0; this._select = []; }
    },
    //设置默认属性
    SetOptions: function(options) {
        this.options = {//默认值
            Fixed: false, //是否固定定位
            Over: true, //是否显示覆盖层
            Center: false, //是否居中
            onShow: function() { } //显示时执行
        };
        Object.extend(this.options, options || {});
    },
    //兼容ie6的固定定位程序
    _fixed: function() {
        var iTop = document.documentElement.scrollTop - this._top + this.Box.offsetTop, iLeft = document.documentElement.scrollLeft - this._left + this.Box.offsetLeft;
        //居中时需要修正
        if (this.Center) { iTop += this.Box.offsetHeight / 2; iLeft += this.Box.offsetWidth / 2; }

        this.Box.style.top = iTop + "px"; this.Box.style.left = iLeft + "px";

        this._top = document.documentElement.scrollTop; this._left = document.documentElement.scrollLeft;
    },
    //显示
    Show: function(options) {
        //固定定位
        if (this.Fixed) {
            if (isIE6) {
                //兼容ie6
                this.Box.style.position = "absolute";
                this._top = document.documentElement.scrollTop; this._left = document.documentElement.scrollLeft;
                window.attachEvent("onscroll", this._fixed.bind(this));
            } else {
                this.Box.style.position = "fixed";
            }
        } else {
            this.Box.style.position = "absolute";
        }
        //覆盖层
        if (this.Over) {
            //显示覆盖层，覆盖层自带select隐藏
            this.OverLay.Show();
        } else {
            //ie6需要把不在Box上的select隐藏
            if (isIE6) {
                this._select = [];
                var oThis = this;
                Each(document.getElementsByTagName("select"), function(o) {
                    if (oThis.Box.contains ? !oThis.Box.contains(o) : !(oThis.Box.compareDocumentPosition(o) & 16)) {
                        o.style.visibility = "hidden"; oThis._select.push(o);
                    }
                })
            }
        }

        this.Box.style.display = "block";

        //居中
        if (this.Center) {
            this.Box.style.top = this.Box.style.left = "50%";
            //显示后才能获取
            var iTop = -this.Box.offsetHeight / 2, iLeft = -this.Box.offsetWidth / 2;
            //ie6或不是固定定位要修正
            if (!this.Fixed || isIE6) { iTop += document.documentElement.scrollTop; iLeft += document.documentElement.scrollLeft; }
            this.Box.style.marginTop = iTop + "px"; this.Box.style.marginLeft = iLeft + "px";
        }

        this.onShow();
    },
    //关闭
    Close: function() {
        this.Box.style.display = "none";
        this.OverLay.Close();
        if (isIE6) { window.detachEvent("onscroll", this._fixed); Each(this._select, function(o) { o.style.visibility = "visible"; }); }
    }
};


function addEventHandler(oTarget, sEventType, fnHandler) {
    if (oTarget.addEventListener) {
        oTarget.addEventListener(sEventType, fnHandler, false);
    } else if (oTarget.attachEvent) {
        oTarget.attachEvent("on" + sEventType, fnHandler);
    } else {
        oTarget["on" + sEventType] = fnHandler;
    }
};

function removeEventHandler(oTarget, sEventType, fnHandler) {
    if (oTarget.removeEventListener) {
        oTarget.removeEventListener(sEventType, fnHandler, false);
    } else if (oTarget.detachEvent) {
        oTarget.detachEvent("on" + sEventType, fnHandler);
    } else {
        oTarget["on" + sEventType] = null;
    }
};

if (!isIE) {
    HTMLElement.prototype.__defineGetter__("currentStyle", function() {
        return this.ownerDocument.defaultView.getComputedStyle(this, null);
    });
}

//拖放程序
var Drag = Class.create();
Drag.prototype = {
    //拖放对象,触发对象
    initialize: function(obj, drag, options) {
        var oThis = this;

        this._obj = $1(obj); //拖放对象
        this.Drag = $1(drag); //触发对象
        this._x = this._y = 0; //记录鼠标相对拖放对象的位置
        //事件对象(用于移除事件)
        this._fM = function(e) { oThis.Move(window.event || e); }
        this._fS = function() { oThis.Stop(); }

        this.SetOptions(options);

        this.Limit = !!this.options.Limit;
        this.mxLeft = parseInt(this.options.mxLeft);
        this.mxRight = parseInt(this.options.mxRight);
        this.mxTop = parseInt(this.options.mxTop);
        this.mxBottom = parseInt(this.options.mxBottom);
        this.mxContainer = this.options.mxContainer;

        this.onMove = this.options.onMove;
        this.Lock = !!this.options.Lock;

        this._obj.style.position = "absolute";
        addEventHandler(this.Drag, "mousedown", function(e) { oThis.Start(window.event || e); });
    },
    //设置默认属性
    SetOptions: function(options) {
        this.options = {//默认值
            Limit: false, //是否设置限制(为true时下面参数有用,可以是负数)
            mxLeft: 0, //左边限制
            mxRight: 0, //右边限制
            mxTop: 0, //上边限制
            mxBottom: 0, //下边限制
            mxContainer: null, //指定限制在容器内
            onMove: function() { }, //移动时执行
            Lock: false//是否锁定
        };
        Object.extend(this.options, options || {});
    },
    //准备拖动
    Start: function(oEvent) {
        if (this.Lock) { return; }
        //记录鼠标相对拖放对象的位置
        this._x = oEvent.clientX - this._obj.offsetLeft;
        this._y = oEvent.clientY - this._obj.offsetTop;
        //mousemove时移动 mouseup时停止
        addEventHandler(document, "mousemove", this._fM);
        addEventHandler(document, "mouseup", this._fS);
        //使鼠标移到窗口外也能释放
        if (isIE) {
            addEventHandler(this.Drag, "losecapture", this._fS);
            this.Drag.setCapture();
        } else {
            addEventHandler(window, "blur", this._fS);
        }
    },
    //拖动
    Move: function(oEvent) {
        //判断是否锁定
        if (this.Lock) { this.Stop(); return; }
        //清除选择(ie设置捕获后默认带这个)
        window.getSelection && window.getSelection().removeAllRanges();
        //当前鼠标位置减去相对拖放对象的位置得到offset位置
        var iLeft = oEvent.clientX - this._x, iTop = oEvent.clientY - this._y;
        //设置范围限制
        if (this.Limit) {
            //如果设置了容器,因为容器大小可能会变化所以每次都要设
            if (!!this.mxContainer) {
                this.mxLeft = this.mxTop = 0;
                this.mxRight = this.mxContainer.clientWidth;
                this.mxBottom = this.mxContainer.clientHeight;
            }
            //获取超出长度
            var iRight = iLeft + this._obj.offsetWidth - this.mxRight, iBottom = iTop + this._obj.offsetHeight - this.mxBottom;
            //这里是先设置右边下边再设置左边上边,可能会不准确
            if (iRight > 0) iLeft -= iRight;
            if (iBottom > 0) iTop -= iBottom;
            if (this.mxLeft > iLeft) iLeft = this.mxLeft;
            if (this.mxTop > iTop) iTop = this.mxTop;
        }
        //设置位置
        //由于offset是把margin也算进去的所以要减去
        this._obj.style.left = iLeft - (parseInt(this._obj.currentStyle.marginLeft) || 0) + "px";
        this._obj.style.top = iTop - (parseInt(this._obj.currentStyle.marginTop) || 0) + "px";
        //附加程序
        this.onMove();
    },
    //停止拖动
    Stop: function() {
        //移除事件
        removeEventHandler(document, "mousemove", this._fM);
        removeEventHandler(document, "mouseup", this._fS);
        if (isIE) {
            removeEventHandler(this.Drag, "losecapture", this._fS);
            this.Drag.releaseCapture();
        } else {
            removeEventHandler(window, "blur", this._fS);
        }
    }
};