var AccordionMenu = (function() {
    var YUD = YAHOO.util.Dom;
    var YUE = YAHOO.util.Event;
    var oMenuSetting = {};
    var oMenuCache = {};
    var dLastHoverTitle;
    YUD.addClass(document.documentElement, 'accordion-menu-js');

    function getDT(e) {
        var dEl = YUE.getTarget(e);

        if ((e.tagName + '').toUpperCase() == 'DD') {
            var dt = e.previousSibling;
            while (dt) {
                if (dt.tagName && dt.tagName.toUpperCase() == 'DT') { break; };
                dt = dt.previousSibling
            };

            if (!dt || dt.tagName.toUpperCase() != 'DT') { return; }
            else { return (dt.tagName === 'DT') ? dt : null };
        }
        else if (e.clientX) {
            var found = false;
            while (dEl.parentNode) {
                if (YUD.hasClass(dEl, 'a-m-t')) { found = true; break; };
                dEl = dEl.parentNode;
            };
            if (!found) { return null }
            else { return (dEl.tagName === 'DT') ? dEl : null };
        };
    };



    function getDD(dt) {
        if (!dt) { return null; };
        var dd = dt.nextSibling;

        while (dd) {
            if (dd.tagName && dd.tagName.toUpperCase() == 'DD') { break; };
            dd = dd.nextSibling;

        };
        if (!dd || dd.tagName.toUpperCase() != 'DD') { return; }
        else { return dd };
    };

    function expand(dl, dt, dd) {
        dl.hasAnimation += 1;
        YUD.addClass(dd, 'a-m-d-before-expand');
        var oAttr = { height: { from: 0, to: dd.offsetHeight} };

        YUD.removeClass(dd, 'a-m-d-before-expand');

        var onComplete = function() {
            oAnim.onComplete.unsubscribe(onComplete);
            oAnim.stop();
            YUD.removeClass(dd, 'a-m-d-anim');
            YUD.addClass(dd, 'a-m-d-expand');
            onComplete = null;
            dl.hasAnimation -= 1;
            var dt = getDT(dd);
            YUD.addClass(dt, 'a-m-t-expand');
            if (oMenuCache[dl.id] && oMenuCache[dl.id].onOpen && dd.style.height != '') {
                oMenuCache[dl.id].onOpen({ dl: dl, dt: dt, dd: dd });
            };
            dd.style.height = '';

        };

        var onTween = function() {
            if (dd.style.height) {
                YUD.addClass(dd, 'a-m-d-anim');
                oAnim.onTween.unsubscribe(onTween);
                onTween = null;
                dd.oAnim = null;
            };

        };

        if (dd.oAnim) {
            dd.oAnim.stop();
            dd.oAnim = null;
            dl.hasAnimation -= 1;
        };
        var oEaseType = YAHOO.util.Easing.easeOut;
        var seconds = 0.5;
        if (oMenuCache[dl.id]) {
            oEaseType = oMenuCache[dl.id]['easeOut'] ? oEaseType : YAHOO.util.Easing.easeIn;
            seconds = oMenuCache[dl.id]['seconds'];

            if (!oMenuCache[dl.id]['animation']) {
                var oAnim = { onComplete: { unsubscribe: function() { } }, stop: function() { } };
                onComplete();
                return;
            };
        };


        var oAnim = new YAHOO.util.Anim(dd, oAttr, seconds, oEaseType);
        oAnim.onComplete.subscribe(onComplete);
        oAnim.onTween.subscribe(onTween);
        oAnim.animate();
        dd.oAnim = oAnim;

    };

    function collapse(dl, dt, dd) {
        dl.hasAnimation += 1;
        YUD.addClass(dd, 'a-m-d-anim');
        var oAttr = { height: { from: dd.offsetHeight, to: 0} };


        var onComplete = function() {
            oAnim.onComplete.unsubscribe(onComplete);
            YUD.removeClass(dd, 'a-m-d-anim');
            YUD.removeClass(dd, 'a-m-d-expand');
            dd.style.height = '';
            dd.oAnim = null;
            onComplete = null;
            dl.hasAnimation -= 1;
            var dt = getDT(dd);
            YUD.removeClass(dt, 'a-m-t-expand');
            if (oMenuCache[dl.id] && oMenuCache[dl.id].onOpen) {
                oMenuCache[dl.id].onClose({ dl: dl, dt: dt, dd: dd });
            };

        };

        if (dd.oAnim) {
            dd.oAnim.stop();
            dd.oAnim = null;
            dl.hasAnimation -= 1;
        };

        var oEaseType = YAHOO.util.Easing.easeOut;
        var seconds = 0.5;
        if (oMenuCache[dl.id]) {
            oEaseType = oMenuCache[dl.id]['easeOut'] ? oEaseType : YAHOO.util.Easing.easeIn;
            seconds = oMenuCache[dl.id]['seconds'];
            if (!oMenuCache[dl.id]['animation']) {
                var oAnim = { onComplete: { unsubscribe: function() { } }, stop: function() { } };
                onComplete();
                return;
            };
        };

        var oAnim = new YAHOO.util.Anim(dd, oAttr, seconds, oEaseType);
        oAnim.onComplete.subscribe(onComplete);
        oAnim.animate();
        dd.oAnim = oAnim;
    };

    function collapseAll(dl, dt, dd) {
        var aOtherDD = YUD.getElementsByClassName('a-m-d-expand', 'dd', dl);
        for (var i = 0; i < aOtherDD.length; i++) {
            var otherDD = aOtherDD[i];
            if (otherDD != dd) {
                collapse(dl, null, otherDD);
            };
        };
    }


    var onMenuMouseover = function(e) {
        var dMenuTitle = getDT(e);
        if (!dMenuTitle) { return; };
        if (dLastHoverTitle) {
            YUD.removeClass(dLastHoverTitle, 'a-m-t-hover');
        };
        YUD.addClass(dMenuTitle, 'a-m-t-hover');
        dLastHoverTitle = dMenuTitle;
        YUE.preventDefault(e);
        return false;
    };

    var onMenuMouseout = function(e) {
        var dMenuTitle = getDT(e);
        if (!dMenuTitle) { return; };
        if (dLastHoverTitle && dLastHoverTitle != dMenuTitle) {
            YUD.removeClass(dLastHoverTitle, 'a-m-t-hover');
            YUD.removeClass(dLastHoverTitle, 'a-m-t-down');
        };
        YUD.removeClass(dMenuTitle, 'a-m-t-down');
        YUD.removeClass(dMenuTitle, 'a-m-t-hover');
        dLastHoverTitle = null;
        YUE.preventDefault(e);
        return false;
    };

    var onMenuMousedown = function(e) {
        var dMenuTitle = getDT(e);
        if (!dMenuTitle) { return; };
        YUD.addClass(dMenuTitle, 'a-m-t-down');
        YUE.preventDefault(e);
        return false;
    };

    var onMenuClick = function(e) {
        var dt = getDT(e);
        if (!dt) { return; };
        var dd = getDD(dt);



        if (!dd) { return; };
        var dl = dt.parentNode;

        if (dl.hasAnimation == null) {
            dl.hasAnimation = 0;
        }
        if (dl.hasAnimation > 0) { return; };
        YUD.removeClass(dt, 'a-m-t-down');

        if (YUD.hasClass(dd, 'a-m-d-expand')) {
            collapse(dl, dt, dd);
        }
        else {
            if (oMenuCache[dl.id] && oMenuCache[dl.id].dependent == false) { }
            else { collapseAll(dl, dt, dd); }
            expand(dl, dt, dd);
        };
        YUE.preventDefault(e);
        return false;
    };


    YUE.on(document, 'mouseover', onMenuMouseover);
    YUE.on(document, 'mouseout', onMenuMouseout);
    YUE.on(document, 'mousedown', onMenuMousedown);
    YUE.on(document, 'click', onMenuClick);

    var oApi = {

        openDtById: function(sId) {
            var dt = document.getElementById(sId);
            if (!dt) { return; };
            if (!YUD.hasClass(dt, 'a-m-t')) { return; };
            var dl = dt.parentNode;
            var dd = getDD(dt);
            if (dl.hasAnimation == null) { dl.hasAnimation = 0; };

            if (dl.hasAnimation > 0) { return; };
            if (YUD.hasClass(dd, 'a-m-d-expand')) { return; };
            if (oMenuCache[dl.id] && oMenuCache[dl.id].dependent == false) { }
            else { collapseAll(dl, dt, dd); }
            expand(dl, dt, dd);
        },

        closeDtById: function(sId) {
            var dt = document.getElementById(sId);
            if (!dt) { return; };
            if (!YUD.hasClass(dt, 'a-m-t')) { return; };
            var dl = dt.parentNode;
            var dd = getDD(dt);
            if (dl.hasAnimation == null) { dl.hasAnimation = 0; };
            if (dl.hasAnimation > 0) { return; };
            if (!YUD.hasClass(dd, 'a-m-d-expand')) { return; };
            collapse(dl, dt, dd);
        },


        setting: function(id, oOptions) {
            if (!oOptions) { return; };

            if (typeof (id) != 'string') { return; };

            var setMunu = function(dl) {
                dl = dl || this;
                dl.hasAnimation = 0;
                oMenuCache[dl.id] =
			{
			    element: dl,
			    dependent: true,
			    onOpen: function() { },
			    onClose: function() { },
			    seconds: 0.5,
			    easeOut: true,
			    openedIds: [],
			    animation: true
			};
                oMenu = oMenuCache[dl.id];

                if (typeof (oOptions['animation']) == 'boolean') {
                    oMenu['animation'] = !!oOptions['animation'];

                };


                if (typeof (oOptions['dependent']) == 'boolean') {
                    oMenu['dependent'] = !!oOptions['dependent'];
                };

                if (typeof (oOptions['easeOut']) == 'boolean') {
                    oMenu['easeOut'] = !!oOptions['easeOut'];
                };

                if (typeof (oOptions['seconds']) == 'number') {
                    oMenu['seconds'] = Math.max(0, oOptions['seconds']);
                };

                if (typeof (oOptions['onOpen']) == 'function') {
                    oMenu['onOpen'] = oOptions['onOpen'];
                };

                if (typeof (oOptions['onClose']) == 'function') {
                    oMenu['onClose'] = oOptions['onClose'];
                };

                if (oOptions['openedIds'].shift) {
                    oMenu['openedIds'] = oOptions['openedIds'];
                };


                for (var i = 0; i < oMenu['openedIds'].length; i++) {
                    var sId = oMenu['openedIds'][i];
                    var dt = document.getElementById(sId);

                    if (dt && dt.tagName.toUpperCase() == 'DT') {
                        var dl = dt.parentNode;
                        var dd = getDD(dt);
                        expand(dl, dt, dd);
                    }
                    else if (!dt) {
                        function onDtAvailable() {
                            var dt = this;
                            if (dt.tagName.toUpperCase() == 'DT') {
                                var dl = dt.parentNode;
                                var dd = getDD(dt);
                                expand(dl, dt, dd);
                            };
                        };

                        YUE.onAvailable(sId, onDtAvailable);
                    }
                };


            };

            if (document.getElementById(id)) {
                setMunu(document.getElementById(id))
            }
            else {
                YUE.onAvailable(id, setMunu);
            };
        }
    }; //endof api

    return oApi;

})();