/**
 * Dropdown menu script
 */
var Menu = Class.create();
Menu.prototype = {

    initialize: function(idOrElement, name, customConfigFunction){
    
        this.name = name;
        this.type = "menu";
        this.closeDelayTimer = null;
        this.closingMenuItem = 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;
    }
    
}

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("dropdown")) 
                this.menuType = "dropdown";
            else 
                if (this.element.hasClassName("flyout")) 
                    this.menuType = "flyout";
                else 
                    if (this.element.hasClassName("horizontal")) 
                        this.menuType = "horizontal";
                    else 
                        this.menuType = "standard";
            if (this.menuType == "flyout" || this.menuType == "dropdown") {
                this.isOpen = false;
                Element.setStyle(this.element, {
                    position: "absolute",
                    top: 0,
                    left: 0,
                    visibility: "hidden"
                });
            }
            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);
                    }
                }
            }
        }
    },
    
    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) - 4) + "px"
            });
			this.parent.element.down('a').addClassName('hover');
        }
        else 
            if (this.menuType == "flyout") {
                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 + "px"
                    });
                }
                else {
                    Element.setStyle(this.element, {
                        left: this.parentMenu.element.offsetWidth + "px"
                    });
                };
                            }
        Element.setStyle(this.element, {
            visibility: "visible"
        });
    },
    
    close: function(){
        Element.setStyle(this.element, {
            visibility: "hidden"
        });
		this.parent.element.down('a').removeClassName('hover');
        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(){
                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;
}

function initMenu(){
    menu = new Menu('main_nav', 'menu', configMenu);
}


Event.observe(window, 'load', initMenu, false);