var cm_TheContextMenu;

function ContextMenu(snippetId, contentView) {

    this.snippetId = snippetId;

    this.mainDiv = undefined;

    this.tailEl = undefined;

    this.contentView = contentView;

    this.showTimeoutId = 0;

    // Width of a tab with no text, just the icon.  Icons must all be the same width.

    // Update this if icon size or tab border width etc. changes -- or better yet, determine it dynamically.

    this.normalTabWidth = 64;

    // ContextMenu is a singleton to avoid problems with scope-chaining in some of the

    // callbacks that it uses.  See handleTabActivate.

    if (cm_TheContextMenu != undefined) app.debug("ERROR: cm_TheContextMenu must be a singleton");

    cm_TheContextMenu = this;

    // Create tabs and their corresponding menus based on JSON data.

    this.createTabsElement = function(data) {

        this.mainDiv = document.createElement("div");

        this.mainDiv.setAttribute("class", "ContextMenuDiv");

        this.mainDiv.setAttribute("id", "cm_mainDivId");

        var tabsDiv = document.createElement("div");

        tabsDiv.setAttribute("class", "TabsDiv");

        tabsDiv.setAttribute("id", "cm_tabsDivId");

        var menuDiv = document.createElement("div");

        menuDiv.setAttribute("class", "MenuDiv");

        menuDiv.setAttribute("id", "cm_menuDivId");

        var tabsUl = document.createElement("ul");

        tabsUl.setAttribute("class", "TabsUl");

        tabsUl.setAttribute("id", "cm_tabsUlId");

        tabsDiv.appendChild(tabsUl);

        var currentTabFound = false;

        // Iterate through the list of tabs.

        for (var i=0; i < data.tabs.length; i++) {

            var tab = data.tabs[i];

            if (tab.visible != undefined) {

                if (!tab.visible()) {

                    continue;

                }

            }

            // Create the tab.

            var tabEl = document.createElement("li");

            tabsUl.appendChild(tabEl);

            var tabDiv = document.createElement("div");

            tabEl.appendChild(tabDiv);

            var iconEl = undefined;

            var iconHighlightedEl = undefined;

            // Create the tab's icons.

            if (tab.icon != undefined) {

                iconEl = document.createElement("img");

                iconEl.setAttribute("id", "icon");

                iconEl.setAttribute("src", tab.icon);

                tabDiv.appendChild(iconEl);

            }

            if (tab.iconHighlighted != undefined) {

                iconHighlightedEl = document.createElement("img");

                iconHighlightedEl.setAttribute("id", "iconHighlighted");

                iconHighlightedEl.setAttribute("src", tab.iconHighlighted);

                tabDiv.appendChild(iconHighlightedEl);

            }

            // Create the tab's text.

            if (tab.text != undefined) {

                var anchorEl = document.createElement("a");

                tabDiv.appendChild(anchorEl);

                var textEl = document.createTextNode(tab.text);

                anchorEl.appendChild(textEl);

            }

            // Create the menu for this tab.

            var menuEl = this.createMenuElement(tab);

            menuDiv.appendChild(menuEl);

            var tabClassName;

            if (tab.current == "true") {

                // This is the current, or selected, tab.

                tabClassName = "ViewContext_HighlightedTab";

                tabDiv.className = "ViewContext_HighlightedTabDiv";

                if(iconEl != undefined) {

                    iconEl.setAttribute("style", "display: none;");

                }

                currentTabFound = true;

            }

            else {

                // Not selected.

                tabClassName = "ViewContext_NormalTab";

                tabDiv.className = "ViewContext_NormalTabDiv";

                if(iconHighlightedEl != undefined) {

                    iconHighlightedEl.setAttribute("style", "display: none;");

                }

                // Hide its menu.

                menuEl.style.display = "none";

            }

            if (tab.disabled == "true") {

                // The tab is disabled, add the appropriate CSS class to it.

                tabClassName += " ViewContext_DisabledTab";

            }

            tabEl.className = tabClassName;

            // Set up callback to show the menu that corresponds to this tab.

            tabEl.onmouseup = this.handleTabActivate;

            tabEl.cm_menu = menuEl;

            // Remember that this tab is disabled.

            tabEl.cm_disabled = tab.disabled == "true";

        }

        // If a "current" tab was not specified, highlight the first tab and display its menu.

        if (!currentTabFound) {

            var firstTabEl = tabsUl.firstChild;

            firstTabEl.className = "ViewContext_HighlightedTab";

            firstTabEl.firstChild.className = "ViewContext_HighlightedTabDiv";

            firstTabEl.cm_menu.style.display = "";

        }

//        this.tailEl = document.createElement("img");

//        this.mainDiv.appendChild(this.tailEl);

//        this.tailEl.setAttribute("id", "cm_tailId");

//        this.tailEl.setAttribute("src", "contextmenu.snippet/icons/menu_tail.png");

        this.mainDiv.appendChild(tabsDiv);

        this.mainDiv.appendChild(menuDiv);

        return this.mainDiv;

    // Create a single menu based on the given data structure.

    this.createMenuElement = function(data) {

        // Create menu list.

        var menuUl = document.createElement("ul");

        menuUl.setAttribute("class", "MenuUl");

        for (var i=0; i < data.menuItems.length; i++) {

            var menuItem = data.menuItems[i];

            // Create the item.

            var itemLi = document.createElement("li");

            itemLi.setAttribute("class", "MenuLi");

            var itemSpan = document.createElement("div");

            // Is it a row if items? enumerate that as a ul inside of this outer li

            if(menuItem.menuRow != undefined) {

                var menuRowUl = document.createElement("ul");

                menuRowUl.setAttribute("class", "MenuRowUl");

                itemSpan.appendChild(menuRowUl);

                for(var j=0; j < menuItem.menuRow.length; j++)

                {

                    var menuRowItem = menuItem.menuRow[j];

                    var rowItemLi = document.createElement("li");

                    rowItemLi.setAttribute("class", "MenuRowLi");

                    menuRowUl.appendChild(rowItemLi);

                    // bind to mouseup

                    rowItemLi.onmouseup =  (function(handler) {

                        return function() {

                            if (handler != undefined)

                                handler();

                            this.hide();

                        }.bind(this)

                    }.bind(this))(menuRowItem.onclick);

                    if (menuRowItem.text != undefined) {

                        var textEl = document.createTextNode(menuRowItem.text);

                        rowItemLi.appendChild(textEl);

                    }

                }

            }

            else {

                itemLi.className += " RegularMenuLi";

                if (menuItem.disabled == "true" || data.disabled == "true") {

                    // Disabled item.

                    itemLi.className += " ViewContext_DisabledMenuItem";

                }

                else {

                    // Enabled item.  Set up the onmouseup handler.

                    itemLi.onmouseup = (function(handler) {

                        return function() {

                            if (handler != undefined)

                                handler();

                            this.hide();

                        }.bind(this)

                    }.bind(this))(menuItem.onclick);

                }

                // Create the item's icon.

                if (menuItem.icon != undefined) {

                    var iconEl = document.createElement("img");

                    itemSpan.appendChild(iconEl);

                    iconEl.setAttribute("src", menuItem.icon);

                }

                // Create the item's text.

                if (menuItem.text != undefined) {

                    var anchorEl = document.createElement("a");

                    itemSpan.appendChild(anchorEl);

                    var textEl = document.createTextNode(menuItem.text);

                    anchorEl.appendChild(textEl);

                }

            }

            menuUl.appendChild(itemLi);

            itemLi.appendChild(itemSpan);

        }

        return menuUl;

    // Handle mouse clicks on tab elements.

    // Note: "this" refers to the element that was clicked on, ie. the tab item.

    this.handleTabActivate = function() {

        var tabsDivChildren = document.getElementById("cm_tabsUlId").childNodes;

        var otherTabsWidth = 0;

        // Set the class for each tab.

        for (var i = 0; i < tabsDivChildren.length; i++) {

            var tabEl = tabsDivChildren[i];

            var iconHighlighted = getChildById(tabEl, "iconHighlighted");

            var icon = getChildById(tabEl, "icon");

            if (tabEl == this) {

                // Activate the tab.

                tabEl.className = "ViewContext_HighlightedTab";

                //tabEl.firstChild.className = "ViewContext_HighlightedTabDiv";

                // Show the highlighted icon, if one exists.

                if(iconHighlighted != undefined) {

                    iconHighlighted.style.display = "";

                    // Hide the normal icon.

                    if (icon != undefined) {

                        icon.style.display = "none";

                    }

                }

            }

            else {

                // Deactivate the tab.

                tabEl.className = "ViewContext_NormalTab";

                //tabEl.firstChildclassName = "ViewContext_NormalTabDiv";

                // If a highlighted icon exists, switch to the normal one, otherwise leave

                // the normal one alone.

                if(iconHighlighted != undefined) {

                    iconHighlighted.style.display = "none";

                    if (icon != undefined) {

                        icon.style.display = "";

                    }

                }

            }

            if (tabEl.cm_disabled) {

                tabEl.className += " ViewContext_DisabledTab";

                //tabEl.firstClassName += " ViewContext_DisabledTabDiv";

            }

        }

        // Show the menu of the tab that was just clicked.

        var menuDivChildren = document.getElementById("cm_menuDivId").childNodes;

        for (var i = 0; i < menuDivChildren.length; i++) {

            var menuEl = menuDivChildren[i];

            if (menuEl == this.cm_menu) {

                menuDivChildren[i].style.display =  "";

            }

            else {

                menuDivChildren[i].style.display =  "none";

            }

        }

        //cm_TheContextMenu.positionTail();

        //document.getElementById(this.snippetId).clientHeight = this.mainDiv.clientHeight;

        //document.getElementById("ContextMenuId").setAttribute("style", "height: " + document.getElementById("cm_mainDivId").clientHeight + "px;")

        cm_TheContextMenu.updateTabSizes();

        snippets[cm_TheContextMenu.snippetId].updateOwnerArea();

    }

    // Return the width of the "non-content" part of the element box, ie. thickness of

    // the padding, the border and the margin.

    this.getNonContentWidth = function(element) {

        var tabStyle = document.defaultView.getComputedStyle(element, null);

        return parseInt(tabStyle["margin-left"]) + parseInt(tabStyle["margin-right"]) +

               parseInt(tabStyle["padding-left"]) + parseInt(tabStyle["padding-right"]) +

               parseInt(tabStyle["border-left-width"]) + parseInt(tabStyle["border-right-width"]);

    }

    // Update the tab widths.  Expand the highlighted tab to its maximum width and shrink the

    // normal tabs to their minimum widths.  Note: it would be preferable to have this done

    // by CSS.

    this.updateTabSizes = function() {

        var tabsUl = document.getElementById("cm_tabsUlId");

        var tabsDivChildren = tabsUl.childNodes;

        var otherTabsWidth = 0;

        var highlightedTab;

        for (var i = 0; i < tabsDivChildren.length; i++) {

            var tabEl = tabsDivChildren[i];

            if (tabEl.className.indexOf("ViewContext_HighlightedTab") != -1) {

                highlightedTab = tabEl;

            }

            else {

                var newTabWidth = cm_TheContextMenu.normalTabWidth - cm_TheContextMenu.getNonContentWidth(tabEl);

                tabEl.style.width = newTabWidth;

                otherTabsWidth += tabEl.offsetWidth;

            }

        }

        if (highlightedTab != undefined) {

            var newWidth = tabsUl.offsetWidth - otherTabsWidth;

            newWidth -= cm_TheContextMenu.getNonContentWidth(highlightedTab) + 2;

            highlightedTab.style.width = newWidth;

        }

    }

    this.positionTail = function() {

        // Move the "tail" into position.

        var tailEl = document.getElementById("cm_tailId");

        if (tailEl != undefined) {

            //var mainDiv = document.getElementById("cm_mainDivId");

            var tailX = (this.mainDiv.clientWidth - tailEl.clientWidth) / 2;

            var tailY = this.mainDiv.clientHeight;

            tailEl.setAttribute("style", "position:absolute; top: " + tailY + "px; left: " + tailX);

        }

    }

    // Create all the DOM elements of the window.

    this.create = function(menuData) {

        var snippetEl = document.getElementById(this.snippetId);

        var el = this.createTabsElement(menuData);

        snippetEl.appendChild(el);

    }

    // Show the content menu.  The menuData must contain an object tree describing the structure of the

    // tabs and sub-menus.

    //

    // Example menu data in JSON format:

    //        var MenuData = {

    //            "tabs": [ {

    //                     "text": "Tab 1",

    //                     "icon": "tab1.png",

    //                     "current": "true",

    //                     "menuItems": [ {

    //                             "text": Menu item 1,

    //                             "onclick": handleMenu1,

    //                             "icon": "menu1.png",

    //                           },

    //                           {

    //                             "text": Menu item 2,

    //                             "onclick": function() { alert("hello"); },

    //                             "icon": "menu2.png",

    //                           },

    //                         ],

    //                 },

    //                 {

    //                     "text": "Tab 2",

    //                     "icon": "tab2.png",

    //                     "menuItems": [ {

    //                             "text": Menu item 1,

    //                             "onclick": handleMenu21,

    //                           },

    //                           {

    //                             "text": Menu item 2,

    //                             "onclick": handleMenu22,

    //                           },

    //                         ],

    //                 },

    //                ]

    //        };

    //

    this.cancel = function() {

        //app.debug("CM: cancel " + this.showTimeoutId);

        clearTimeout(this.showTimeoutId);

        this.showTimeoutId = 0;

        this.cleanUp();

    }

    this.show = function(menuData) {

        this.cleanUp();

        this.create(menuData);

        this.showTimeoutId = setTimeout('cm_TheContextMenu.showIt()', 10);

    }

    this.cleanUp = function() {

        // Remove elements from DOM to save memory.

        var oldEl = document.getElementById("cm_mainDivId");

        if (oldEl) {

            var snippetEl = document.getElementById(cm_TheContextMenu.snippetId);

            snippetEl.removeChild(oldEl);

        }

    }

    // Hide this window.

    this.hide = function() {

        snippets[cm_TheContextMenu.snippetId].hide();

    }

    this.onHide = function() {

        this.cleanUp();

    }

    this.showIt = function() {

        cm_TheContextMenu.updateTabSizes();

        // Use a timer to actually show the window to allow the page re-layout

        // to finish.  We don't know when this really happens but 50ms seems to

        // be enough on the N97.  Without this delay the bottom of the window

        // often gets clipped.

        setTimeout("cm_TheContextMenu.showIt2()", 50);

    }

    this.showIt2 = function() {

        var snippet = snippets[cm_TheContextMenu.snippetId];

        snippet.updateOwnerArea();

        snippet.setZValue(2);

        centerSnippet(snippet);

//        if (showTail) {

//            cm_TheContextMenu.positionTail();

//        }

        snippet.show();

    }

    chrome.chromeComplete.connect(createDelegate(this,

        function() {

            var snippet = snippets[this.snippetId];

            chrome.aspectChanged.connect(createDelegate(this,

                    function(a) {

                        centerSnippet(snippets[this.snippetId]);

                    }));

            snippet.hidden.connect(createDelegate(this, this.onHide));

        }));

}  // End ContextMenu class