(function (){
    var browser = baidu.editor.browser,
        domUtils = baidu.editor.dom.domUtils;

    var magic = '$EDITORUI';
    var root = window[magic] = {};
    var uidMagic = 'ID' + magic;
    var uidCount = 0;

    var uiUtils = baidu.editor.ui.uiUtils = {
        uid: function (obj){
            return (obj ? obj[uidMagic] || (obj[uidMagic] = ++ uidCount) : ++ uidCount);
        },
        hook: function ( fn, callback ) {
            var dg;
            if (fn && fn._callbacks) {
                dg = fn;
            } else {
                dg = function (){
                    var q;
                    if (fn) {
                        q = fn.apply(this, arguments);
                    }
                    var callbacks = dg._callbacks;
                    var k = callbacks.length;
                    while (k --) {
                        var r = callbacks[k].apply(this, arguments);
                        if (q === undefined) {
                            q = r;
                        }
                    }
                    return q;
                };
                dg._callbacks = [];
            }
            dg._callbacks.push(callback);
            return dg;
        },
        createElementByHtml: function (html){
            var el = document.createElement('div');
            el.innerHTML = html;
            el = el.firstChild;
            el.parentNode.removeChild(el);
            return el;
        },
        getViewportElement: function (){
            return (browser.ie && browser.quirks) ?
                document.body : document.documentElement;
        },
        getClientRect: function (element){
            var bcr;
            //trace  IE6下在控制编辑器显隐时可能会报错，catch一下
            try{
                bcr = element.getBoundingClientRect();
            }catch(e){
                bcr={left:0,top:0,height:0,width:0}
            }
            var rect = {
                left: Math.round(bcr.left),
                top: Math.round(bcr.top),
                height: Math.round(bcr.bottom - bcr.top),
                width: Math.round(bcr.right - bcr.left)
            };
            var doc;
            while ((doc = element.ownerDocument) !== document &&
                (element = domUtils.getWindow(doc).frameElement)) {
                bcr = element.getBoundingClientRect();
                rect.left += bcr.left;
                rect.top += bcr.top;
            }
            rect.bottom = rect.top + rect.height;
            rect.right = rect.left + rect.width;
            return rect;
        },
        getViewportRect: function (){
            var viewportEl = uiUtils.getViewportElement();
            var width = (window.innerWidth || viewportEl.clientWidth) | 0;
            var height = (window.innerHeight ||viewportEl.clientHeight) | 0;
            return {
                left: 0,
                top: 0,
                height: height,
                width: width,
                bottom: height,
                right: width
            };
        },
        setViewportOffset: function (element, offset){
            var rect;
            var fixedLayer = uiUtils.getFixedLayer();
            if (element.parentNode === fixedLayer) {
                element.style.left = offset.left + 'px';
                element.style.top = offset.top + 'px';
            } else {
                domUtils.setViewportOffset(element, offset);
            }
        },
        getEventOffset: function (evt){
            var el = evt.target || evt.srcElement;
            var rect = uiUtils.getClientRect(el);
            var offset = uiUtils.getViewportOffsetByEvent(evt);
            return {
                left: offset.left - rect.left,
                top: offset.top - rect.top
            };
        },
        getViewportOffsetByEvent: function (evt){
            var el = evt.target || evt.srcElement;
            var frameEl = domUtils.getWindow(el).frameElement;
            var offset = {
                left: evt.clientX,
                top: evt.clientY
            };
            if (frameEl && el.ownerDocument !== document) {
                var rect = uiUtils.getClientRect(frameEl);
                offset.left += rect.left;
                offset.top += rect.top;
            }
            return offset;
        },
        setGlobal: function (id, obj){
            root[id] = obj;
            return magic + '["' + id  + '"]';
        },
        unsetGlobal: function (id){
            delete root[id];
        },
        copyAttributes: function (tgt, src){
            var attributes = src.attributes;
            var k = attributes.length;
            while (k --) {
                var attrNode = attributes[k];
                if ( attrNode.nodeName != 'style' && attrNode.nodeName != 'class' && (!browser.ie || attrNode.specified) ) {
                    tgt.setAttribute(attrNode.nodeName, attrNode.nodeValue);
                }
            }
            if (src.className) {
                domUtils.addClass(tgt,src.className);
            }
            if (src.style.cssText) {
                tgt.style.cssText += ';' + src.style.cssText;
            }
        },
        removeStyle: function (el, styleName){
            if (el.style.removeProperty) {
                el.style.removeProperty(styleName);
            } else if (el.style.removeAttribute) {
                el.style.removeAttribute(styleName);
            } else throw '';
        },
        contains: function (elA, elB){
            return elA && elB && (elA === elB ? false : (
                elA.contains ? elA.contains(elB) :
                    elA.compareDocumentPosition(elB) & 16
                ));
        },
        startDrag: function (evt, callbacks,doc){
            var doc = doc || document;
            var startX = evt.clientX;
            var startY = evt.clientY;
            function handleMouseMove(evt){
                var x = evt.clientX - startX;
                var y = evt.clientY - startY;
                callbacks.ondragmove(x, y);
                if (evt.stopPropagation) {
                    evt.stopPropagation();
                } else {
                    evt.cancelBubble = true;
                }
            }
            if (doc.addEventListener) {
                function handleMouseUp(evt){
                    doc.removeEventListener('mousemove', handleMouseMove, true);
                    doc.removeEventListener('mouseup', handleMouseMove, true);
                    window.removeEventListener('mouseup', handleMouseUp, true);
                    callbacks.ondragstop();
                }
                doc.addEventListener('mousemove', handleMouseMove, true);
                doc.addEventListener('mouseup', handleMouseUp, true);
                window.addEventListener('mouseup', handleMouseUp, true);

                evt.preventDefault();
            } else {
                var elm = evt.srcElement;
                elm.setCapture();
                function releaseCaptrue(){
                    elm.releaseCapture();
                    elm.detachEvent('onmousemove', handleMouseMove);
                    elm.detachEvent('onmouseup', releaseCaptrue);
                    elm.detachEvent('onlosecaptrue', releaseCaptrue);
                    callbacks.ondragstop();
                }
                elm.attachEvent('onmousemove', handleMouseMove);
                elm.attachEvent('onmouseup', releaseCaptrue);
                elm.attachEvent('onlosecaptrue', releaseCaptrue);
                evt.returnValue = false;
            }
            callbacks.ondragstart();
        },
        getFixedLayer: function (){
            var layer = document.getElementById('edui_fixedlayer');
            if (layer == null) {
                layer = document.createElement('div');
                layer.id = 'edui_fixedlayer';
                document.body.appendChild(layer);
                if (browser.ie && browser.version <= 8) {
                    layer.style.position = 'absolute';
                    bindFixedLayer();
                    setTimeout(updateFixedOffset);
                } else {
                    layer.style.position = 'fixed';
                }
                layer.style.left = '0';
                layer.style.top = '0';
                layer.style.width = '0';
                layer.style.height = '0';
            }
            return layer;
        },
        makeUnselectable: function (element){
            if (browser.opera || (browser.ie && browser.version < 9)) {
                element.unselectable = 'on';
                if (element.hasChildNodes()) {
                    for (var i=0; i<element.childNodes.length; i++) {
                        if (element.childNodes[i].nodeType == 1) {
                            uiUtils.makeUnselectable(element.childNodes[i]);
                        }
                    }
                }
            } else {
                if (element.style.MozUserSelect !== undefined) {
                    element.style.MozUserSelect = 'none';
                } else if (element.style.WebkitUserSelect !== undefined) {
                    element.style.WebkitUserSelect = 'none';
                } else if (element.style.KhtmlUserSelect !== undefined) {
                    element.style.KhtmlUserSelect = 'none';
                }
            }
        }
    };
    function updateFixedOffset(){
        var layer = document.getElementById('edui_fixedlayer');
        uiUtils.setViewportOffset(layer, {
            left: 0,
            top: 0
        });
//        layer.style.display = 'none';
//        layer.style.display = 'block';

        //#trace: 1354
//        setTimeout(updateFixedOffset);
    }
    function bindFixedLayer(adjOffset){
        domUtils.on(window, 'scroll', updateFixedOffset);
        domUtils.on(window, 'resize', baidu.editor.utils.defer(updateFixedOffset, 0, true));
    }
})();
