/*

File: FancyToolbar.js

Abstract: JavaScript for the FancyToolbar

Version: 1.0 beta (works with Safari 3 and Firefox only)

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*/

// Helper function to remove a className
Element.prototype.removeStyleClass = function(className) 
{
    if (this.hasStyleClass(className))
        this.className = this.className.replace(className, "");
}

// Helper function to add a className
Element.prototype.addStyleClass = function(className) 
{
    if (!this.hasStyleClass(className))
        this.className += (this.className.length ? " " + className : className);
}

// Helper function to test if a element has a className
Element.prototype.hasStyleClass = function(className) 
{
    return this.className.indexOf(className) !== -1;
}

// FancyToolbar: constructor function, takes an iframe
function FancyToolbar(iframe)
{
    this.setupNeeded = true;
    this.editArea = iframe;

    // add event listeners to show and hide when the iframe is focused and blurred
    var toolbar = this;

    // Mozilla sends the blur and focus events on the frame's document object
    iframe.contentDocument.addEventListener("focus", function(event) { toolbar.show() }, false);
    iframe.contentDocument.addEventListener("blur", function(event) { toolbar.hide() }, false);

    // WebKit sends the blur and focus events on the frame's window object
    iframe.contentDocument.defaultView.addEventListener("focus", function(event) { toolbar.show() }, false);
    iframe.contentDocument.defaultView.addEventListener("blur", function(event) { toolbar.hide() }, false);
}

// FancyToolbar: mouse down event handler
FancyToolbar.prototype.toolbarMouseDown = function(event)
{
    this.clickingToolbar = true;
}

// FancyToolbar: mouse up event handler
FancyToolbar.prototype.toolbarMouseUp = function(event)
{
    // refocus the editing area
    this.editArea.contentDocument.defaultView.focus();
    this.clickingToolbar = false;
}

// FancyToolbar: setup and create the DOM elements for the toolbar
FancyToolbar.prototype.setupIfNeeded = function()
{
    if (!this.setupNeeded)
        return;

    delete this.setupNeeded;

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

    this.toolbarPartElements = {};

    this.toolbarPartElements.top = document.createElement("div");
    this.toolbarPartElements.top.className = "fancy-toolbar-bezel-top";
    this.toolbarElement.appendChild(this.toolbarPartElements.top);

    this.toolbarPartElements.bottom = document.createElement("div");
    this.toolbarPartElements.bottom.className = "fancy-toolbar-bezel-bottom";
    this.toolbarElement.appendChild(this.toolbarPartElements.bottom);

    this.toolbarPartElements.left = document.createElement("div");
    this.toolbarPartElements.left.className = "fancy-toolbar-bezel-left";
    this.toolbarElement.appendChild(this.toolbarPartElements.left);

    this.toolbarPartElements.right = document.createElement("div");
    this.toolbarPartElements.right.className = "fancy-toolbar-bezel-right";
    this.toolbarElement.appendChild(this.toolbarPartElements.right);

    this.toolbarPartElements.topRight = document.createElement("div");
    this.toolbarPartElements.topRight.className = "fancy-toolbar-bezel-top-right";
    this.toolbarElement.appendChild(this.toolbarPartElements.topRight);

    this.toolbarPartElements.topLeft = document.createElement("div");
    this.toolbarPartElements.topLeft.className = "fancy-toolbar-bezel-top-left";
    this.toolbarElement.appendChild(this.toolbarPartElements.topLeft);

    this.toolbarPartElements.bottomRight = document.createElement("div");
    this.toolbarPartElements.bottomRight.className = "fancy-toolbar-bezel-bottom-right";
    this.toolbarElement.appendChild(this.toolbarPartElements.bottomRight);

    this.toolbarPartElements.bottomLeft = document.createElement("div");
    this.toolbarPartElements.bottomLeft.className = "fancy-toolbar-bezel-bottom-left";
    this.toolbarElement.appendChild(this.toolbarPartElements.bottomLeft);

    var toolbar = this;
    this.toolbarElement.addEventListener("mousedown", function(event) { toolbar.toolbarMouseDown(event); }, false);
    this.toolbarElement.addEventListener("mouseup", function(event) { toolbar.toolbarMouseUp(event); }, false);

    var toolbarArea = document.createElement("div");
    toolbarArea.className = "fancy-toolbar-area";

    this.boldButton = document.createElement("div");
    this.boldButton.appendChild(document.createTextNode("B"));
    this.boldButton.className = "fancy-toolbar-button fancy-toolbar-button-bold";
    this.boldButton.addEventListener("click", function(event) { toolbar.boldSelection(event); }, false);
    toolbarArea.appendChild(this.boldButton);

    this.underlineButton = document.createElement("div");
    this.underlineButton.appendChild(document.createTextNode("U"));
    this.underlineButton.className = "fancy-toolbar-button fancy-toolbar-button-underline";
    this.underlineButton.addEventListener("click", function(event) { toolbar.underlineSelection(event); }, false);
    toolbarArea.appendChild(this.underlineButton);

    this.italicButton = document.createElement("div");
    this.italicButton.appendChild(document.createTextNode("I"));
    this.italicButton.className = "fancy-toolbar-button fancy-toolbar-button-italic";
    this.italicButton.addEventListener("click", function(event) { toolbar.italicSelection(event); }, false);
    toolbarArea.appendChild(this.italicButton);

    this.textAlignLeftButton = document.createElement("div");
    this.textAlignLeftButton.className = "fancy-toolbar-button-segment fancy-toolbar-button-segment-start fancy-toolbar-button-selected";
    this.textAlignLeftButton.addEventListener("click", function(event) { toolbar.textAlignLeft(event); }, false);
    toolbarArea.appendChild(this.textAlignLeftButton);

    var cap = document.createElement("div");
    cap.className = "fancy-toolbar-button-segment-cap";
    this.textAlignLeftButton.appendChild(cap);

    var middle = document.createElement("div");
    middle.className = "fancy-toolbar-button-segment-middle";
    this.textAlignLeftButton.appendChild(middle);

    var align = document.createElement("div");
    align.className = "fancy-toolbar-button-text-align fancy-toolbar-button-text-align-left";
    middle.appendChild(align);

    var divider = document.createElement("div");
    divider.className = "fancy-toolbar-button-segment-divider";
    this.textAlignLeftButton.appendChild(divider);

    this.textAlignCenterButton = document.createElement("div");
    this.textAlignCenterButton.className = "fancy-toolbar-button-segment";
    this.textAlignCenterButton.addEventListener("click", function(event) { toolbar.textAlignCenter(event); }, false);
    toolbarArea.appendChild(this.textAlignCenterButton);

    middle = document.createElement("div");
    middle.className = "fancy-toolbar-button-segment-middle";
    this.textAlignCenterButton.appendChild(middle);

    align = document.createElement("div");
    align.className = "fancy-toolbar-button-text-align fancy-toolbar-button-text-align-center";
    middle.appendChild(align);

    divider = document.createElement("div");
    divider.className = "fancy-toolbar-button-segment-divider";
    this.textAlignCenterButton.appendChild(divider);

    this.textAlignJustifyButton = document.createElement("div");
    this.textAlignJustifyButton.className = "fancy-toolbar-button-segment";
    this.textAlignJustifyButton.addEventListener("click", function(event) { toolbar.textAlignJustify(event); }, false);
    toolbarArea.appendChild(this.textAlignJustifyButton);

    middle = document.createElement("div");
    middle.className = "fancy-toolbar-button-segment-middle";
    this.textAlignJustifyButton.appendChild(middle);

    align = document.createElement("div");
    align.className = "fancy-toolbar-button-text-align fancy-toolbar-button-text-align-justify";
    middle.appendChild(align);

    divider = document.createElement("div");
    divider.className = "fancy-toolbar-button-segment-divider";
    this.textAlignJustifyButton.appendChild(divider);

    this.textAlignRightButton = document.createElement("div");
    this.textAlignRightButton.className = "fancy-toolbar-button-segment fancy-toolbar-button-segment-end";
    this.textAlignRightButton.addEventListener("click", function(event) { toolbar.textAlignRight(event); }, false);
    toolbarArea.appendChild(this.textAlignRightButton);

    middle = document.createElement("div");
    middle.className = "fancy-toolbar-button-segment-middle";
    this.textAlignRightButton.appendChild(middle);

    align = document.createElement("div");
    align.className = "fancy-toolbar-button-text-align fancy-toolbar-button-text-align-right";
    middle.appendChild(align);

    cap = document.createElement("div");
    cap.className = "fancy-toolbar-button-segment-cap";
    this.textAlignRightButton.appendChild(cap);

    this.linkButton = document.createElement("div");
    this.linkButton.className = "fancy-toolbar-button fancy-toolbar-button-link";
    this.linkButton.addEventListener("click", function(event) { toolbar.linkSelection(event); }, false);
    toolbarArea.appendChild(this.linkButton);

    var img = document.createElement("img");
    img.src = "FancyToolbarImages/link.png";
    this.linkButton.appendChild(img);

    this.imageButton = document.createElement("div");
    this.imageButton.className = "fancy-toolbar-button fancy-toolbar-button-image";
    this.imageButton.addEventListener("click", function(event) { toolbar.insertImage(event); }, false);
    toolbarArea.appendChild(this.imageButton);

    img = document.createElement("img");
    img.src = "FancyToolbarImages/camera.png";
    this.imageButton.appendChild(img);

    this.toolbarElement.appendChild(toolbarArea);

    this.toolbarElement.className = "fancy-toolbar-bezel";

    // set the opacity to 0 to start with
    this.toolbarElement.style.opacity = "0";
}

// FancyToolbar: show the toolbar
FancyToolbar.prototype.show = function()
{
    if (this.showing)
        return;

    this.showing = true;

    this.setupIfNeeded();

    // add the toolbar element to the body
    document.body.insertBefore(this.toolbarElement, document.body.firstChild);

    // resize the toolbar element to match the iframe
    this.adjustSize();

    // add the event listeners we need
    this.updateToolbarListener = function(event) { toolbar.updateToolbarButtonStates(toolbar) };
    this.windowResizeListener = function(event) { toolbar.windowResize(event) };
    this.editArea.contentDocument.addEventListener("mouseup", this.updateToolbarListener, false);
    this.editArea.contentDocument.addEventListener("mousemove", this.updateToolbarListener, false);
    this.editArea.contentDocument.addEventListener("keypress", this.updateToolbarListener, false);

    window.addEventListener("resize", this.windowResizeListener, false);

    // start the toolbar fading in
    var toolbar = this;
    setTimeout(function() { toolbar.animateToolbar(1.0) }, 30);
}

// FancyToolbar: hide the toolbar
FancyToolbar.prototype.hide = function()
{
    if (this.clickingToolbar)
        return;

    this.showing = false;

    // start the toolbar fading out
    var toolbar = this;
    setTimeout(function() { toolbar.animateToolbar(0.0) }, 30);
}

// FancyToolbar: hidden function called when the toolbar fade ends
FancyToolbar.prototype.hidden = function()
{
    // remove the event listeners we don't need anymore
    this.editArea.contentDocument.removeEventListener("mouseup", this.updateToolbarListener, false);
    this.editArea.contentDocument.removeEventListener("mousemove", this.updateToolbarListener, false);
    this.editArea.contentDocument.removeEventListener("keypress", this.updateToolbarListener, false);
    window.removeEventListener("resize", this.windowResizeListener, false);

    // remove the toolbar element
    this.toolbarElement.parentNode.removeChild(this.toolbarElement);
}

// FancyToolbar: update the toolbar button states
FancyToolbar.prototype.updateToolbarButtonStates = function()
{
    var doc = this.editArea.contentDocument;

    // check the Bold state
    if (doc.queryCommandState("bold"))
        this.boldButton.addStyleClass("fancy-toolbar-button-selected");
    else
        this.boldButton.removeStyleClass("fancy-toolbar-button-selected");

    // check the Underline state
    if (doc.queryCommandState("underline"))
        this.underlineButton.addStyleClass("fancy-toolbar-button-selected");
    else
        this.underlineButton.removeStyleClass("fancy-toolbar-button-selected");

    // check the Italic state
    if (doc.queryCommandState("italic"))
        this.italicButton.addStyleClass("fancy-toolbar-button-selected");
    else
        this.italicButton.removeStyleClass("fancy-toolbar-button-selected");
}

// FancyToolbar: link button event handler
FancyToolbar.prototype.linkSelection = function(event)
{
    // prompt the user for a URL
    this.clickingToolbar = true;
    var value = prompt("Enter link URL:", "http://www.apple.com");
    this.clickingToolbar = false;
    if (value)
        this.editArea.contentDocument.execCommand("createLink", false, value);
}

// FancyToolbar: image button event handler
FancyToolbar.prototype.insertImage = function(event)
{
    // prompt the user for a URL
    this.clickingToolbar = true;
    var value = prompt("Enter image URL:", "images/safari.png");
    this.clickingToolbar = false;
    if (value)
        this.editArea.contentDocument.execCommand("insertImage", false, value);
}

// FancyToolbar: bold button event handler
FancyToolbar.prototype.boldSelection = function(event)
{
    this.editArea.contentDocument.execCommand("bold", false, null);
    this.updateToolbarButtonStates();
}

// FancyToolbar: underline button event handler
FancyToolbar.prototype.underlineSelection = function(event)
{
    this.editArea.contentDocument.execCommand("underline", false, null);
    this.updateToolbarButtonStates();
}

// FancyToolbar: italic button event handler
FancyToolbar.prototype.italicSelection = function(event)
{
    this.editArea.contentDocument.execCommand("italic", false, null);
    this.updateToolbarButtonStates();
}

// FancyToolbar: text align left button event handler
FancyToolbar.prototype.textAlignLeft = function(event)
{
    this.editArea.contentDocument.execCommand("justifyLeft", false, null);

    // enable the left text align button, disable all other toolbar text align buttons
    this.textAlignLeftButton.addStyleClass("fancy-toolbar-button-selected");
    this.textAlignCenterButton.removeStyleClass("fancy-toolbar-button-selected");
    this.textAlignJustifyButton.removeStyleClass("fancy-toolbar-button-selected");
    this.textAlignRightButton.removeStyleClass("fancy-toolbar-button-selected");
}

// FancyToolbar: text align center button event handler
FancyToolbar.prototype.textAlignCenter = function(event)
{
    this.editArea.contentDocument.execCommand("justifyCenter", false, null);

    // enable the center text align button, disable all other toolbar text align buttons
    this.textAlignLeftButton.removeStyleClass("fancy-toolbar-button-selected");
    this.textAlignCenterButton.addStyleClass("fancy-toolbar-button-selected");
    this.textAlignJustifyButton.removeStyleClass("fancy-toolbar-button-selected");
    this.textAlignRightButton.removeStyleClass("fancy-toolbar-button-selected");
}

// FancyToolbar: text align justify button event handler
FancyToolbar.prototype.textAlignJustify = function(event)
{
    this.editArea.contentDocument.execCommand("justifyFull", false, null);

    // enable the justify text align button, disable all other toolbar text align buttons
    this.textAlignLeftButton.removeStyleClass("fancy-toolbar-button-selected");
    this.textAlignCenterButton.removeStyleClass("fancy-toolbar-button-selected");
    this.textAlignJustifyButton.addStyleClass("fancy-toolbar-button-selected");
    this.textAlignRightButton.removeStyleClass("fancy-toolbar-button-selected");
}

// FancyToolbar: text align right button event handler
FancyToolbar.prototype.textAlignRight = function(event)
{
    this.editArea.contentDocument.execCommand("justifyRight", false, null);

    // enable the right text align button, disable all other toolbar text align buttons
    this.textAlignLeftButton.removeStyleClass("fancy-toolbar-button-selected");
    this.textAlignCenterButton.removeStyleClass("fancy-toolbar-button-selected");
    this.textAlignJustifyButton.removeStyleClass("fancy-toolbar-button-selected");
    this.textAlignRightButton.addStyleClass("fancy-toolbar-button-selected");
}

// FancyToolbar: adjust the size of the toolbar bezel to match the iframe
FancyToolbar.prototype.adjustSize = function()
{
    var toolbarTopHeight = 55;
    var toolbarSideWidth = 26;

    this.toolbarElement.style.top = (this.editArea.offsetTop - toolbarTopHeight) + "px";
    this.toolbarElement.style.left = (this.editArea.offsetLeft - toolbarSideWidth) + "px";
    this.toolbarElement.style.width = this.editArea.offsetWidth + (toolbarSideWidth * 2) + "px";

    var width = this.editArea.offsetWidth;
    var height = this.editArea.offsetHeight;

    this.toolbarPartElements.left.style.height = height + "px";
    this.toolbarPartElements.right.style.height = height + "px";

    var newTop = (height + toolbarTopHeight) + "px";
    this.toolbarPartElements.bottom.style.top = newTop;
    this.toolbarPartElements.bottomLeft.style.top = newTop;
    this.toolbarPartElements.bottomRight.style.top = newTop;
}

// FancyToolbar: window resize event handler
FancyToolbar.prototype.windowResize = function(event)
{
    // call the adjustSize function after a delay to make sure the iframe has fully resized
    var toolbar = this;
    setTimeout(function() { toolbar.adjustSize() }, 0);
}

// FancyToolbar: fade animation function
FancyToolbar.prototype.animateToolbar = function(targetOpacity) {
    // increment or decrement the opacity depending on the target opacity
    if (this.toolbarElement.style.opacity < targetOpacity)
        this.toolbarElement.style.opacity = parseFloat(this.toolbarElement.style.opacity) + 0.1;
    else if (this.toolbarElement.style.opacity > targetOpacity)
        this.toolbarElement.style.opacity = parseFloat(this.toolbarElement.style.opacity) - 0.1;

    if (this.toolbarElement.style.opacity != targetOpacity) {
        // the opacity not yet the target opacity, keep animating
        var toolbar = this;
        setTimeout(function() { toolbar.animateToolbar(targetOpacity) }, 10);
        return;
    }

    // the opacity is now 0, so call the hidden function
    if (targetOpacity === 0.0)
        this.hidden();
}

window.addEventListener("load", function(event) {
    new Image().src = "FancyToolbarImages/button.png";
    new Image().src = "FancyToolbarImages/buttonLeft.png";
    new Image().src = "FancyToolbarImages/buttonMiddle.png";
    new Image().src = "FancyToolbarImages/buttonPressed.png";
    new Image().src = "FancyToolbarImages/buttonPressedLeft.png";
    new Image().src = "FancyToolbarImages/buttonPressedMiddle.png";
    new Image().src = "FancyToolbarImages/buttonPressedRight.png";
    new Image().src = "FancyToolbarImages/buttonRight.png";
    new Image().src = "FancyToolbarImages/camera.png";
    new Image().src = "FancyToolbarImages/link.png";
    new Image().src = "FancyToolbarImages/textAlign.png";
    new Image().src = "FancyToolbarImages/toolbarOutlineTop.png";
    new Image().src = "FancyToolbarImages/toolbarOutlineLeft.png";
    new Image().src = "FancyToolbarImages/toolbarOutlineBottom.png";
    new Image().src = "FancyToolbarImages/toolbarOutlineRight.png";
    new Image().src = "FancyToolbarImages/toolbarOutlineTopLeft.png";
    new Image().src = "FancyToolbarImages/toolbarOutlineTopRight.png";
    new Image().src = "FancyToolbarImages/toolbarOutlineBottomLeft.png";
    new Image().src = "FancyToolbarImages/toolbarOutlineBottomRight.png";

    // find all the iframes
    var iframes = document.getElementsByTagName("iframe");
    for (var i = 0; i < iframes.length; ++i) {
        var iframe = iframes[i];
        if (!iframe.hasStyleClass("editable") || iframe.fancyToolbar)
            continue;
        // enable editing and make a new FancyToolbar
        iframe.contentDocument.designMode = "on";
        iframe.fancyToolbar = new FancyToolbar(iframe);
    }
}, false);