var Menu = Class.create();
Menu.prototype = {
    initialize: function (idOrElement, name, customConfigFunction) {
        this.name = name;
        this.type = "menu";
        this.closeDelayTimer = null;
        this.openDelayTimer = null;
        this.closingMenuItem = null;
        this.openingMenuItem = null;
        this.config();
        if (typeof customConfigFunction == "function") {
            this.customConfig = customConfigFunction;
            this.customConfig();
        }
        this.rootContainer = new MenuContainer(idOrElement, this);
    },
    config: function () {
        this.collapseBorders = true;
        this.quickCollapse = true;
        this.closeDelayTime = 500;
        this.openDelayTime = 500;
    }
}
var MenuContainer = Class.create();
MenuContainer.prototype = {
    initialize: function (idOrElement, parent) {
        this.type = "menuContainer";
        this.menuItems = [];
        this.init(idOrElement, parent);
    },
    init: function (idOrElement, parent) {
        this.element = $(idOrElement);
        this.parent = parent;
        this.parentMenu = (this.type == "menuContainer") ? ((parent) ? parent.parent : null) : parent;
        this.root = parent instanceof Menu ? parent : parent.root;
        this.id = this.element.id;
        if (this.type == "menuContainer") {
            if (this.element.hasClassName("level1")) this.menuType = "horizontal";
            else if (this.element.hasClassName("level2")) this.menuType = "dropdown";
            else this.menuType = "flyout";
            if (this.menuType == "flyout" || this.menuType == "dropdown") {
                this.isOpen = false;
                Element.setStyle(this.element, {
                    position: "absolute",
                    top: "0px",
                    left: "0px",
                    display: "none"
                });
            } else {
                this.isOpen = true;
            }
        } else {
            this.isOpen = this.parentMenu.isOpen;
        }
        var childNodes = this.element.childNodes;
        if (childNodes == null) return;
        for (var i = 0; i < childNodes.length; i++) {
            var node = childNodes[i];
            if (node.nodeType == 1) {
                if (this.type == "menuContainer") {
                    if (node.tagName.toLowerCase() == "li") {
                        this.menuItems.push(new MenuItem(node, this));
                    }
                } else {
                    if (node.tagName.toLowerCase() == "ul") {
                        this.subMenu = new MenuContainer(node, this);
                    }
                }
            }
        }
    },
    getBorders: function (element) {
        var ltrb = ["Left", "Top", "Right", "Bottom"];
        var result = {};
        for (var i = 0; i < ltrb.length; ++i) {
            if (this.element.currentStyle) var value = parseInt(this.element.currentStyle["border" + ltrb[i] + "Width"]);
            else if (window.getComputedStyle) var value = parseInt(window.getComputedStyle(this.element, "").getPropertyValue("border-" + ltrb[i].toLowerCase() + "-width"));
            else var value = parseInt(this.element.style["border" + ltrb[i]]);
            result[ltrb[i].toLowerCase()] = isNaN(value) ? 0 : value;
        }
        return result;
    },
    open: function () {
        if (this.root.closeDelayTimer) window.clearTimeout(this.root.closeDelayTimer);
        this.parentMenu.closeAll(this);
        this.isOpen = true;
        if (this.menuType == "dropdown") {
            Element.setStyle(this.element, {
                left: (Position.positionedOffset(this.parent.element)[0]) + "px",
                top: (Position.positionedOffset(this.parent.element)[1] + Element.getHeight(this.parent.element)) + "px"
            });
        } else if (this.menuType == "flyout") {
            var parentMenuBorders = this.parentMenu ? this.parentMenu.getBorders() : new Object();
            var thisBorders = this.getBorders();
            if ((Position.positionedOffset(this.parentMenu.element)[0] + this.parentMenu.element.offsetWidth + this.element.offsetWidth + 20) > (window.innerWidth ? window.innerWidth : document.body.offsetWidth)) {
                Element.setStyle(this.element, {
                    left: (-this.element.offsetWidth - (this.root.collapseBorders ? 0 : parentMenuBorders["left"])) + "px"
                });
            } else {
                Element.setStyle(this.element, {
                    left: (this.parentMenu.element.offsetWidth - parentMenuBorders["left"] - (this.root.collapseBorders ? Math.min(parentMenuBorders["right"], thisBorders["left"]) : 0)) + "px"
                });
            }
            Element.setStyle(this.element, {
                top: (this.parent.element.offsetTop - parentMenuBorders["top"] - this.menuItems[0].element.offsetTop) + "px"
            });
        }
        Element.setStyle(this.element, {
            display: "block"
        });
    },
    close: function () {
        Element.setStyle(this.element, {
            display: "none"
        });
        this.isOpen = false;
        this.closeAll();
    },
    closeAll: function (trigger) {
        for (var i = 0; i < this.menuItems.length; ++i) {
            this.menuItems[i].closeItem(trigger);
        }
    }
}
var MenuItem = Class.create();
Object.extend(Object.extend(MenuItem.prototype, MenuContainer.prototype), {
    initialize: function (idOrElement, parent) {
        var menuItem = this;
        this.type = "menuItem";
        this.subMenu;
        this.init(idOrElement, parent);
        if (this.subMenu) {
            this.element.onmouseover = function () {
                if (menuItem.root.openDelayTimer) window.clearTimeout(menuItem.root.openDelayTimer);
                eval(menuItem.root.name + ".openingMenuItem = menuItem");
                menuItem.root.openDelayTimer = window.setTimeout(menuItem.root.name + ".openingMenuItem.subMenu.open()", menuItem.root.openDelayTime);
                //menuItem.subMenu.open();
            }
        } else {
            if (this.root.quickCollapse) {
                this.element.onmouseover = function () {
                    menuItem.parentMenu.closeAll();
                }
            }
        }
        var linkTag = this.element.getElementsByTagName("A")[0];
        if (linkTag) {
            linkTag.onfocus = this.element.onmouseover;
            this.link = linkTag;
            this.text = linkTag.text;
        }
        if (this.subMenu) {
            this.element.onmouseout = function () {
                if (menuItem.root.openDelayTimer) window.clearTimeout(menuItem.root.openDelayTimer);
                if (menuItem.root.closeDelayTimer) window.clearTimeout(menuItem.root.closeDelayTimer);
                eval(menuItem.root.name + ".closingMenuItem = menuItem");
                menuItem.root.closeDelayTimer = window.setTimeout(menuItem.root.name + ".closingMenuItem.subMenu.close()", menuItem.root.closeDelayTime);
            }
        }
    },
    openItem: function () {
        this.isOpen = true;
        if (this.subMenu) {
            this.subMenu.open();
        }
    },
    closeItem: function (trigger) {
        this.isOpen = false;
        if (this.subMenu) {
            if (this.subMenu != trigger) this.subMenu.close();
        }
    }
});
var menu;

function configMenu() {
    this.closeDelayTime = 300;
    this.openDelayTime = 100;
}

function initMenu() {
    menu = new Menu('root', 'menu', configMenu);
}
Event.observe(window, 'load', initMenu, false);