/*
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
  },
  
  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;
    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 = content.cloneNode(true); // 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;