/*
ModalBox - The pop-up window thingie with AJAX, based on prototype and script.aculo.us.

Copyright Andrey Okonetchnikov (andrej.okonetschnikow@gmail.com), 2006-2007
All rights reserved.
 
VERSION 1.6.1
Last Modified: 04/13/2008
*/

if (!window.Modalbox)
    var Modalbox = new Object();

Modalbox.Methods = {
    overrideAlert: false, // Override standard browser alert message with ModalBox
    focusableElements: new Array,
    currFocused: 0,
    initialized: false,
    active: true,
    options: {
        title: "ModalBox Window", // Title of the ModalBox window
        overlayClose: true, // Close modal box by clicking on overlay
        width: 500, // Default width in px
        height: 90, // Default height in px
        overlayOpacity: .65, // Default overlay opacity
        overlayDuration: .25, // Default overlay fade in/out duration in seconds
        slideDownDuration: .5, // Default Modalbox appear slide down effect in seconds
        slideUpDuration: .5, // Default Modalbox hiding slide up effect in seconds
        resizeDuration: .25, // Default resize duration seconds
        inactiveFade: true, // Fades MB window on inactive state
        transitions: true, // Toggles transition effects. Transitions are enabled by default
        loadingString: "Please wait. Loading...", // Default loading string message
        closeString: "Close window", // Default title attribute for close window link
        closeValue: "×", // Default string for close link in the header
        params: {},
        method: 'get', // Default Ajax request method
        autoFocusing: true, // Toggles auto-focusing for form elements. Disable for long text pages.
        aspnet: false // Should be use then using with ASP.NET costrols. Then true Modalbox window will be injected into the first form element.
    },
    _options: new Object,

    setOptions: function(options) {
        Object.extend(this.options, options || {});
    },

    _init: function(options) {
        // Setting up original options with default options
        Object.extend(this._options, this.options);
        this.setOptions(options);

        //Creating the overlay
        this.MBoverlay = new Element("div", { id: "MB_overlay", style: "opacity: 0" });

        //Creating the modal window
        this.MBwindow = new Element("div", {id: "MB_window", style: "display: none"}).update(
            this.MBframe = new Element("div", {id: "MB_frame"}).update(
                this.MBheader = new Element("div", {id: "MB_header"}).update(
                    this.MBcaption = new Element("div", {id: "MB_caption"})
                )
            )
        );
        this.MBclose = new Element("a", {id: "MB_close", title: this.options.closeString, href: "#"}).update("<span>" + this.options.closeValue + "</span>");
        this.MBheader.insert({'bottom':this.MBclose});

        this.MBcontent = new Element("div", {id: "MB_content"}).update(
            this.MBloading = new Element("div", {id: "MB_loading"}).update(this.options.loadingString)
        );
        this.MBframe.insert({'bottom':this.MBcontent});

        // Inserting into DOM. If parameter set and form element have been found will inject into it. Otherwise will inject into body as topmost element.
        // Be sure to set padding and marging to null via CSS for both body and (in case of asp.net) form elements. 
        var injectToEl = this.options.aspnet ? $(document.body).down('form') : $(document.body);
        injectToEl.insert({'top':this.MBwindow});
        injectToEl.insert({'top':this.MBoverlay});

        // Initial scrolling position of the window. To be used for remove scrolling effect during ModalBox appearing
        this.initScrollX = window.pageXOffset || document.body.scrollLeft || document.documentElement.scrollLeft;
        this.initScrollY = window.pageYOffset || document.body.scrollTop || document.documentElement.scrollTop;
        
        //Adding event observers
        this.hideObserver = this._hide.bindAsEventListener(this);
        this.kbdObserver = this._kbdHandler.bindAsEventListener(this);
        this._initObservers();

        this.initialized = true; // Mark as initialized
    },

    _yCloneNode: function(eltToClone) {
        var memoire = eltToClone.getElementsByTagName("SELECT");
        var tmp = eltToClone.cloneNode(true)
        var selectElts = tmp.getElementsByTagName("SELECT");

        for (var i=0; i<memoire.length; i++) {
            selectElts[i].selectedIndex = memoire[i].selectedIndex;
        }

        memoire = null;
        selectElts = null;
        return tmp;
    },

    show: function(content, options) {
        if(!this.initialized) this._init(options); // Check for is already initialized

        this.content = content;
        this.setOptions(options);

        if(this.options.title) // Updating title of the MB
            $(this.MBcaption).update(this.options.title);
        else { // If title isn't given, the header will not displayed
            $(this.MBheader).hide();
            $(this.MBcaption).hide();
        }

        if(this.MBwindow.style.display == "none") { // First modal box appearing
            this._appear();
            this.event("onShow"); // Passing onShow callback
        }
        else { // If MB already on the screen, update it
            this._update();
            this.event("onUpdate"); // Passing onUpdate callback
        } 
    },

    hide: function(options) { // External hide method to use from external HTML and JS
        if(this.initialized) {
            // Reading for options/callbacks except if event given as a pararmeter
            if(options && typeof options.element != 'function') Object.extend(this.options, options); 
            // Passing beforeHide callback
            this.event("beforeHide");
            if(this.options.transitions)
                Effect.SlideUp(this.MBwindow, { duration: this.options.slideUpDuration, transition: Effect.Transitions.sinoidal, afterFinish: this._deinit.bind(this) } );
            else {
                $(this.MBwindow).hide();
                this._deinit();
            }
        } else throw("Modalbox is not initialized.");
    },

    _hide: function(event) { // Internal hide method to use with overlay and close link
        event.stop(); // Stop event propaganation for link elements
        /* Then clicked on overlay we'll check the option and in case of overlayClose == false we'll break hiding execution [Fix for #139] */
        if(event.element().id == 'MB_overlay' && !this.options.overlayClose) return false;
        this.hide();
    },

    alert: function(message){
        var html = '<div class="MB_alert"><p>' + message + '</p><input type="button" onclick="Modalbox.hide()" value="OK" /></div>';
        Modalbox.show(html, {title: 'Alert: ' + document.title, width: 300});
    },

    _appear: function() { // First appearing of MB
        if(Prototype.Browser.IE && !navigator.appVersion.match(/\b7.0\b/)) { // Preparing IE 6 for showing modalbox
            window.scrollTo(0,0);
            this._prepareIE("100%", "hidden"); 
        }
        this._setWidth();
        this._setPosition();
        if(this.options.transitions) {
            $(this.MBoverlay).setStyle({opacity: 0});
            new Effect.Fade(this.MBoverlay, {
                    from: 0, 
                    to: this.options.overlayOpacity, 
                    duration: this.options.overlayDuration, 
                    afterFinish: function() {
                        new Effect.SlideDown(this.MBwindow, {
                            duration: this.options.slideDownDuration, 
                            transition: Effect.Transitions.sinoidal, 
                            afterFinish: function(){ 
                                this._setPosition(); 
                                this.loadContent();
                            }.bind(this)
                        });
                    }.bind(this)
            });
        } else {
            $(this.MBoverlay).setStyle({opacity: this.options.overlayOpacity});
            $(this.MBwindow).show();
            this._setPosition(); 
            this.loadContent();
        }
        this._setWidthAndPosition = this._setWidthAndPosition.bindAsEventListener(this);
        Event.observe(window, "resize", this._setWidthAndPosition);
    },

    resize: function(byWidth, byHeight, options) { // Change size of MB without loading content
        var oWidth = $(this.MBoverlay).getWidth();
        var wHeight = $(this.MBwindow).getHeight();
        var wWidth = $(this.MBwindow).getWidth();
        var hHeight = $(this.MBheader).getHeight();
        var cHeight = $(this.MBcontent).getHeight();
        var newHeight = ((wHeight - hHeight + byHeight) < cHeight) ? (cHeight + hHeight) : (wHeight + byHeight);
        var newWidth = wWidth + byWidth;
        this.options.width = newWidth;
        if(options) this.setOptions(options); // Passing callbacks
        if(this.options.transitions) {
            new Effect.Morph(this.MBwindow, {
                style: "width:" + newWidth + "px; height:" + newHeight + "px; left:" + ((oWidth - newWidth)/2) + "px",
                duration: this.options.resizeDuration, 
                beforeStart: function(fx){
                    fx.element.setStyle({overflow:"hidden"}); // Fix for MSIE 6 to resize correctly
                },
                afterFinish: function(fx) {
                    fx.element.setStyle({overflow:"visible"});
                    this.event("_afterResize"); // Passing internal callback
                    this.event("afterResize"); // Passing callback
                }.bind(this)
            });
        } else {
            this.MBwindow.setStyle({width: newWidth + "px", height: newHeight + "px"});
            setTimeout(function() {
                this.event("_afterResize"); // Passing internal callback
                this.event("afterResize"); // Passing callback
            }.bind(this), 1);
        }
        
    },

    resizeToContent: function(options){
        // Resizes the modalbox window to the actual content height.
        // This might be useful to resize modalbox after some content modifications which were changed ccontent height.
        
        var byHeight = this.options.height - $(this.MBwindow).getHeight();
        if(byHeight != 0) {
            if(options) this.setOptions(options); // Passing callbacks
            Modalbox.resize(0, byHeight);
        }
    },

    resizeToInclude: function(element, options){
        // Resizes the modalbox window to the camulative height of element. Calculations are using CSS properties for margins and border.
        // This method might be useful to resize modalbox before including or updating content.
        
        var el = $(element);
        var elHeight = el.getHeight() + parseInt(el.getStyle('margin-top'), 0) + parseInt(el.getStyle('margin-bottom'), 0) + parseInt(el.getStyle('border-top-width'), 0) + parseInt(el.getStyle('border-bottom-width'), 0);
        if(elHeight > 0) {
            if(options) this.setOptions(options); // Passing callbacks
            Modalbox.resize(0, elHeight);
        }
    },

    _update: function() { // Updating MB in case of wizards
        $(this.MBcontent).update($(this.MBloading).update(this.options.loadingString));
        this.loadContent();
    },

    loadContent: function () {
        if(this.event("beforeLoad") != false) { // If callback passed false, skip loading of the content
            if(typeof this.content == 'string') {
                var htmlRegExp = new RegExp(/<\/?[^>]+>/gi);
                if(htmlRegExp.test(this.content)) { // Plain HTML given as a parameter
                    this._insertContent(this.content.stripScripts(), function(){
                        this.content.extractScripts().map(function(script) { 
                            return eval(script.replace("<!--", "").replace("// -->", ""));
                        }.bind(window));
                    }.bind(this));
                } else // URL given as a parameter. We'll request it via Ajax
                    new Ajax.Request( this.content, { method: this.options.method.toLowerCase(), parameters: this.options.params, 
                        onSuccess: function(transport) {
                            var response = new String(transport.responseText);
                            this._insertContent(transport.responseText.stripScripts(), function(){
                                response.extractScripts().map(function(script) { 
                                    return eval(script.replace("<!--", "").replace("// -->", ""));
                                }.bind(window));
                            });
                        }.bind(this),
                        onException: function(instance, exception){
                            Modalbox.hide();
                            throw('Modalbox Loading Error: ' + exception);
                        }
                    });
                    
            } else if (typeof this.content == 'object') {// HTML Object is given
                this._insertContent(this.content);
            } else {
                Modalbox.hide();
                throw('Modalbox Parameters Error: Please specify correct URL or HTML element (plain HTML or object)');
            }
        }
    },

    _insertContent: function(content, callback){
        $(this.MBcontent).hide().update("");
        if(typeof content == 'string') { // Plain HTML is given
            this.MBcontent.update(new Element("div", { style: "display: none" }).update(content)).down().show();
        } else if (typeof content == 'object') { // HTML Object is given
            var _htmlObj = this._yCloneNode(content); // If node already a part of DOM we'll clone it
            // If clonable element has ID attribute defined, modifying it to prevent duplicates
            if(content.id) content.id = "MB_" + content.id;
            /* Add prefix for IDs on all elements inside the DOM node */
            $(content).select('*[id]').each(function(el){ el.id = "MB_" + el.id; });
            this.MBcontent.update(_htmlObj).down('div').show();
            if(Prototype.Browser.IE) // Toggling back visibility for hidden selects in IE
                $$("#MB_content select").invoke('setStyle', {'visibility': ''});
        }

        // Prepare and resize modal box for content
        if(this.options.height == this._options.height) {
            Modalbox.resize((this.options.width - $(this.MBwindow).getWidth()), $(this.MBcontent).getHeight() - $(this.MBwindow).getHeight() + $(this.MBheader).getHeight(), {
                afterResize: function(){
                    setTimeout(function(){ // MSIE fix
                        this._putContent(callback);
                    }.bind(this),1);
                }.bind(this)
            });
        } else { // Height is defined. Creating a scrollable window
            this._setWidth();
            this.MBcontent.setStyle({overflow: 'auto', height: $(this.MBwindow).getHeight() - $(this.MBheader).getHeight() - 13 + 'px'});
            setTimeout(function(){ // MSIE fix
                this._putContent(callback);
            }.bind(this),1);
        }
    },

    _putContent: function(callback){
        this.MBcontent.show();
        this.focusableElements = this._findFocusableElements();
        this._setFocus(); // Setting focus on first 'focusable' element in content (input, select, textarea, link or button)
        if(callback != undefined)
            callback(); // Executing internal JS from loaded content
        this.event("afterLoad"); // Passing callback
    },

    activate: function(options){
        this.setOptions(options);
        this.active = true;
        $(this.MBclose).observe("click", this.hideObserver);
        if(this.options.overlayClose)
            $(this.MBoverlay).observe("click", this.hideObserver);
        $(this.MBclose).show();
        if(this.options.transitions && this.options.inactiveFade)
            new Effect.Appear(this.MBwindow, {duration: this.options.slideUpDuration});
    },

    deactivate: function(options) {
        this.setOptions(options);
        this.active = false;
        $(this.MBclose).stopObserving("click", this.hideObserver);
        if(this.options.overlayClose)
            $(this.MBoverlay).stopObserving("click", this.hideObserver);
        $(this.MBclose).hide();
        if(this.options.transitions && this.options.inactiveFade)
            new Effect.Fade(this.MBwindow, {duration: this.options.slideUpDuration, to: .75});
    },

    _initObservers: function(){
        $(this.MBclose).observe("click", this.hideObserver);
        if(this.options.overlayClose)
            $(this.MBoverlay).observe("click", this.hideObserver);
        if(Prototype.Browser.Gecko)
            Event.observe(document, "keypress", this.kbdObserver); // Gecko is moving focus a way too fast
        else
            Event.observe(document, "keydown", this.kbdObserver); // All other browsers are okay with keydown
    },

    _removeObservers: function(){
        $(this.MBclose).stopObserving("click", this.hideObserver);
        if(this.options.overlayClose)
            $(this.MBoverlay).stopObserving("click", this.hideObserver);
        if(Prototype.Browser.Gecko)
            Event.stopObserving(document, "keypress", this.kbdObserver);
        else
            Event.stopObserving(document, "keydown", this.kbdObserver);
    },

    _setFocus: function() { 
        /* Setting focus to the first 'focusable' element which is one with tabindex = 1 or the first in the form loaded. */
        if(this.focusableElements.length > 0 && this.options.autoFocusing == true) {
            var firstEl = this.focusableElements.find(function (el){
                return el.tabIndex == 1;
            }) || this.focusableElements.first();
            this.currFocused = this.focusableElements.toArray().indexOf(firstEl);
            firstEl.focus(); // Focus on first focusable element except close button
        } else if($(this.MBclose).visible())
            $(this.MBclose).focus(); // If no focusable elements exist focus on close button
    },

    _findFocusableElements: function(){ // Collect form elements or links from MB content
        this.MBcontent.select('input:not([type~=hidden]), select, textarea, button, a[href]').invoke('addClassName', 'MB_focusable');
        return this.MBcontent.select('.MB_focusable');
    },

    _kbdHandler: function(event) {
        var node = event.element();
        switch(event.keyCode) {
            case Event.KEY_TAB:
                event.stop();

                /* Switching currFocused to the element which was focused by mouse instead of TAB-key. Fix for #134 */ 
                if(node != this.focusableElements[this.currFocused])
                    this.currFocused = this.focusableElements.toArray().indexOf(node);

                if(!event.shiftKey) { //Focusing in direct order
                    if(this.currFocused == this.focusableElements.length - 1) {
                        this.focusableElements.first().focus();
                        this.currFocused = 0;
                    } else {
                        this.currFocused++;
                        this.focusableElements[this.currFocused].focus();
                    }
                } else { // Shift key is pressed. Focusing in reverse order
                    if(this.currFocused == 0) {
                        this.focusableElements.last().focus();
                        this.currFocused = this.focusableElements.length - 1;
                    } else {
                        this.currFocused--;
                        this.focusableElements[this.currFocused].focus();
                    }
                }
                break;            
            case Event.KEY_ESC:
                if(this.active) this._hide(event);
                break;
            case 32:
                this._preventScroll(event);
                break;
            case 0: // For Gecko browsers compatibility
                if(event.which == 32) this._preventScroll(event);
                break;
            case Event.KEY_UP:
            case Event.KEY_DOWN:
            case Event.KEY_PAGEDOWN:
            case Event.KEY_PAGEUP:
            case Event.KEY_HOME:
            case Event.KEY_END:
                // Safari operates in slightly different way. This realization is still buggy in Safari.
                if(Prototype.Browser.WebKit && !["textarea", "select"].include(node.tagName.toLowerCase()))
                    event.stop();
                else if( (node.tagName.toLowerCase() == "input" && ["submit", "button"].include(node.type)) || (node.tagName.toLowerCase() == "a") )
                    event.stop();
                break;
        }
    },

    _preventScroll: function(event) { // Disabling scrolling by "space" key
        if(!["input", "textarea", "select", "button"].include(event.element().tagName.toLowerCase())) 
            event.stop();
    },

    _deinit: function()
    {
        this._removeObservers();
        Event.stopObserving(window, "resize", this._setWidthAndPosition );
        if(this.options.transitions) {
            Effect.toggle(this.MBoverlay, 'appear', {duration: this.options.overlayDuration, afterFinish: this._removeElements.bind(this) });
        } else {
            this.MBoverlay.hide();
            this._removeElements();
        }
        $(this.MBcontent).setStyle({overflow: '', height: ''});
    },

    _removeElements: function () {
        $(this.MBoverlay).remove();
        $(this.MBwindow).remove();
        if(Prototype.Browser.IE && !navigator.appVersion.match(/\b7.0\b/)) {
            this._prepareIE("", ""); // If set to auto MSIE will show horizontal scrolling
            window.scrollTo(this.initScrollX, this.initScrollY);
        }

        /* Replacing prefixes 'MB_' in IDs for the original content */
        if(typeof this.content == 'object') {
            if(this.content.id && this.content.id.match(/MB_/)) {
                this.content.id = this.content.id.replace(/MB_/, "");
            }
            this.content.select('*[id]').each(function(el){ el.id = el.id.replace(/MB_/, ""); });
        }
        /* Initialized will be set to false */
        this.initialized = false;
        this.event("afterHide"); // Passing afterHide callback
        this.setOptions(this._options); //Settings options object into intial state
    },

    _setWidth: function () { //Set size
        $(this.MBwindow).setStyle({width: this.options.width + "px", height: this.options.height + "px"});
    },

    _setPosition: function () {
        $(this.MBwindow).setStyle({left: (($(this.MBoverlay).getWidth() - $(this.MBwindow).getWidth()) / 2 ) + "px"});
    },

    _setWidthAndPosition: function () {
        $(this.MBwindow).setStyle({width: this.options.width + "px"});
        this._setPosition();
    },

    _getScrollTop: function () { //From: http://www.quirksmode.org/js/doctypes.html
        var theTop;
        if (document.documentElement && document.documentElement.scrollTop)
            theTop = document.documentElement.scrollTop;
        else if (document.body)
            theTop = document.body.scrollTop;
        return theTop;
    },
    _prepareIE: function(height, overflow){
        $$('html, body').invoke('setStyle', {width: height, height: height, overflow: overflow}); // IE requires width and height set to 100% and overflow hidden
        $$("select").invoke('setStyle', {'visibility': overflow}); // Toggle visibility for all selects in the common document
    },
    event: function(eventName) {
        if(this.options[eventName]) {
            var returnValue = this.options[eventName](); // Executing callback
            this.options[eventName] = null; // Removing callback after execution
            if(returnValue != undefined) 
                return returnValue;
            else 
                return true;
        }
        return true;
    }
};

Object.extend(Modalbox, Modalbox.Methods);

if(Modalbox.overrideAlert) window.alert = Modalbox.alert;