//
//  ModalBox - The pop-up window thingie with AJAX, based on Prototype JS framework.
//
//  Created by Andrew Okonetchnikov
//  Copyright 2006-2010 okonet.ru. All rights reserved.
//
//  Licensed under MIT license.
//

if (Object.isUndefined(Prototype.Browser.IE6)) {
	Prototype.Browser.IE6 = (navigator.appName.indexOf("Microsoft Internet Explorer") != -1 && navigator.appVersion.indexOf("MSIE 6.0") != -1 && !window.XMLHttpRequest);
}

if (!window.Modalbox)
	var Modalbox = {};

Modalbox.Methods = {
	overrideAlert: false, // Override standard browser alert message with ModalBox
	focusableElements: [],
	currFocused: 0,
	initialized: false, // Modalbox is visible
	active: true, // Modalbox is visible and active
	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: 0.65, // Default overlay opacity
		overlayDuration: 0.25, // Default overlay fade in/out duration in seconds
		slideDownDuration: 0.5, // Default Modalbox appear slide down effect in seconds
		slideUpDuration: 0.5, // Default Modalbox hiding slide up effect in seconds
		resizeDuration: 0.25, // 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 true when using with ASP.NET controls. When true Modalbox window will be injected into the first form element.
		resizeCSSID: ''
	},
	_options: {},

	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.MBwindowwrapper = new Element("div", {id: "MB_windowwrapper"}).update(
			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.MBwindowwrapper});
		injectToEl.insert({'top':this.MBoverlay});

		var scrollOffsets = document.viewport.getScrollOffsets();
		if (scrollOffsets[1] > 0) {
			$('MB_window').setStyle({top:scrollOffsets[1] + 'px'});
		}

		Event.observe(window, 'scroll', function() {
			scrollOffsets = document.viewport.getScrollOffsets();
			$('MB_window').setStyle({top:scrollOffsets[1] + 'px'});
		});

		// 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.resizeObserver = this._setWidthAndPosition.bindAsEventListener(this);
		this._initObservers();

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

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

		this._cleanUpContentIDs();

		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 parameter
			if (options && !Object.isFunction(options.element))
				Object.extend(this.options, options);
			this.event("beforeHide"); // Passing beforeHide callback
			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();
			}
			Event.stopObserving(window, 'scroll');
		} else {
			throw("Modalbox is not initialized.");
		}
	},

	_hide: function(event) { // Internal hide method to use with overlay and close link
		event.stop(); // Stop event propagation for link elements
		// When 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.IE6) { // Preparing IE 6 for showing modalbox
			window.scrollTo(0,0);
			this._prepareIEHtml("100%", "hidden");
			this._prepareIESelects("hidden");
		}
		this._setWidth();
		if(this.options.transitions) {
			this.MBoverlay.setOpacity(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: this.loadContent.bind(this)
					});
				}).bind(this)
			});
		} else {
			this.MBoverlay.setOpacity(this.options.overlayOpacity);
			this.MBwindow.show();
			this.loadContent();
		}
		Event.observe(window, "resize", this.resizeObserver);
	},

	resize: function(byWidth, byHeight, options) { // Change size of MB without content reloading
		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 el = $(this.MBwindow);
		var contentEl = $(this.MBcontent);
		var windowBottomMargin = 10;
		newHeight += windowBottomMargin;
		var windowOffset = (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)) + windowBottomMargin;
		var contentPadding = (parseInt(contentEl.getStyle('padding-top')) + parseInt(contentEl.getStyle('padding-bottom')));

		if ((newHeight + windowOffset + contentPadding) > document.viewport.getHeight()) {
			// adjust window height to account for margins and border widths
			newHeight = document.viewport.getHeight() - windowOffset - windowBottomMargin;
			// calculate content height including header height and padding values
			newcHeight = newHeight - hHeight - parseInt($(this.MBframe).getStyle('padding-bottom'), 0) - parseInt($(this.MBcontent).getStyle('padding-bottom'), 0);
			$(this.MBcontent).setStyle({height:newcHeight + 'px'});
		} else if ($(this.MBcontent).getStyle('height')) {
			// release any MB_content height set prior to establish scrollbars in content area
			$(this.MBcontent).setStyle({height:''});
		}

		var newWidth = wWidth + byWidth;
		//var newStyle = {width: newWidth + "px", height: newHeight + "px", left: (o.width - newWidth)/2 + "px"};
		var newStyle = {width: newWidth + "px", height: newHeight + "px"};
		this.options.width = newWidth;
		if (options) this.setOptions(options); // Passing callbacks
		if (this.options.transitions && !Modalbox.animating) {
			Modalbox.animating = true;
			new Effect.Morph(this.MBwindow, {
				style: newStyle,
				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
					Modalbox.animating = false;
				}).bind(this)
			});
		} else {
			this.MBwindow.setStyle(newStyle);
			(function() {
				this.event("_afterResize"); // Passing internal callback
				this.event("afterResize"); // Passing callback
			}).bind(this).defer();
		}
	},

	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 content height.

		if (typeof options == "undefined") {
			options = {};
		}

		// check to see if MB_content includes any images
		var mbimages = $('MB_content').select('img');
		var totalimages = mbimages.length;
		if (mbimages[0]) {
			if (typeof options.imagesloaded == "undefined") {

				var loadedImages = $A();
				var loadedImageTotal = 0;
				mbimages.each(function(o,idx) {
					loadedImages[idx] = new Image();
					loadedImages[idx].src = o.src;
					loadedImages[idx].onload = function() {
						loadedImageTotal++;
						if (loadedImageTotal == totalimages) {
							// make sure all images have been rendered by checking their height
							var imageincomplete = false;
							mbimages.each(function(i) {
								if (i.height == 0) {
									imageincomplete = true;
								}
							});
							if (imageincomplete || Modalbox.animating) {
								// some image hasn't been rendered yet, trigger resize loop until it is
								Modalbox.resizeToContent();
							} else {
								// trigger one final resize, but set imagesloaded option to skip inspection of images
								options.imagesloaded = true;
								Modalbox.resizeToContent(options);
							}
						}
					}
				})
			}
		}

		var byWidth = 0, byHeight = this.options.height - this.MBwindow.getHeight();
		if (options.resizeCSSID && $(options.resizeCSSID)) {
			// byWidth is the amount of pixels needed to increase/decrease window to meet width of options.resizeCSSID
			// plus a 10 pixel margin to accommodate scrollbars
			byWidth = $(options.resizeCSSID).getWidth() - $(this.MBwindow).getWidth() + (parseInt($(this.MBcontent).getStyle('padding-left'), 0) + parseInt($(this.MBcontent).getStyle('padding-right'), 0)) + 15;
		}
		if (byHeight != 0) {
			this.resize(byWidth, byHeight, options);
		}
	},

	resizeToInclude: function(element, options){
		// Resizes the modalbox window to the cumulative 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) {
			this.resize(0, elHeight, options);
		}
	},

	_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._processContent(this.content);
				} 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,
						onComplete: (function(response) {
							this._processContent(response.responseText);
						}).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 {
				this.hide();
				throw('Modalbox Parameters Error: Please specify correct URL or HTML element (plain HTML or object)');
			}
		}
	},

	_processContent: function(content) {
		var html = content.stripScripts(), scripts = content.extractScripts();
		this._insertContent(html, function() {
			scripts.map(function(script) {
				return eval(script.replace("//<![CDATA[", "").replace("//]]>", ""));
			}, window);
		});
	},

	_insertContent: function(content, callback) {
		this.MBcontent.hide().update();

		if (typeof content == 'string') { // Plain HTML is given
			this.MBcontent.insert(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 is already a part of DOM we'll clone it
			// If cloneable element has ID attribute defined, modify 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.insert(_htmlObj).down('div').show();
			if (Prototype.Browser.IE6) { // Toggling back visibility for hidden selects in IE
				this._prepareIESelects("", "#MB_content ");
			}
		}

		// Prepare and resize modal box for content
		if (this.options.height == this._options.height) {
			this.resize((this.options.width - $(this.MBwindow).getWidth()), this.MBcontent.getHeight() - $(this.MBwindow).getHeight() + this.MBheader.getHeight(), {
				afterResize: (function() {
					this._putContent.bind(this, callback).defer(); // MSIE fix
				}).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'
			});
			this._putContent.bind(this, callback).defer(); // MSIE fix
		}
	},

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

	activate: function(options) {
		this.setOptions(options);
		this.active = true;
		if (this.options.overlayClose)
			this.MBoverlay.observe("click", this.hideObserver);
		this.MBclose.observe("click", this.hideObserver).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;
		if (this.options.overlayClose)
			this.MBoverlay.stopObserving("click", this.hideObserver);
		this.MBclose.stopObserving("click", this.hideObserver).hide();
		if (this.options.transitions && this.options.inactiveFade)
			new Effect.Fade(this.MBwindow, {duration: this.options.slideUpDuration, to: 0.75});
	},

	_initObservers: function() {
		this.MBclose.observe("click", this.hideObserver);
		if (this.options.overlayClose)
			this.MBoverlay.observe("click", this.hideObserver);
		// Gecko and Opera are moving focus a way too fast, all other browsers are okay with keydown
		var kbdEvent = (Prototype.Browser.Gecko || Prototype.Browser.Opera) ? "keypress" : "keydown";
		Event.observe(document, kbdEvent, this.kbdObserver);
	},

	_removeObservers: function() {
		this.MBclose.stopObserving("click", this.hideObserver);
		if (this.options.overlayClose)
			this.MBoverlay.stopObserving("click", this.hideObserver);
		var kbdEvent = (Prototype.Browser.Gecko || Prototype.Browser.Opera) ? "keypress" : "keydown";
		Event.stopObserving(document, kbdEvent, 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.options.autoFocusing) { // autoFocusing should is enabled in options. Fixes #30
			if (this.focusableElements.length) {
				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 and links from MB content
		// TODO maybe add :enabled to select and textarea elements
		this.focusableElements = this.MBcontent.select('input:not([type=hidden]):enabled, select, textarea, button, a[href]');
	},

	_kbdHandler: function(event) {
		var node = event.element();
		switch(event.keyCode) {
			case Event.KEY_TAB:
				event.stop();
				this._findFocusableElements();
				if (!this.focusableElements.length) return false; // Do nothing if there is no elements to gain focus

				// 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.indexOf(node);

				if (!event.shiftKey) { // Focusing in direct order
					if (this.currFocused >= this.focusableElements.length - 1) {
						this.currFocused = 0;
					} else {
						this.currFocused++;
					}
				} else { // Shift key is pressed. Focusing in reverse order
					if (this.currFocused <= 0) {
						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:
				var tagName = node.tagName.toLowerCase();
				// Safari operates in slightly different way. This realization is still buggy in Safari.
				if (Prototype.Browser.WebKit && !["textarea", "select"].include(tagName)) {
					event.stop();
				} else if ((tagName == "input" && ["submit", "button"].include(node.type)) || (tagName == "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.resizeObserver);
		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: ''});
	},

	_cleanUpContentIDs: function() {
		// Replace 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_/, "");
			});
		}
	},

	_removeElements: function() {
		if (Prototype.Browser.Opera) { // Remove overlay after-effects in Opera
			window.scrollBy(0, 0);
		}
		this.MBoverlay.remove();
		$(this.MBwindowwrapper).remove();
		if (Prototype.Browser.IE6) {
			this._prepareIEHtml("", ""); // If set to auto MSIE will show horizontal scrolling
			this._prepareIESelects("");
			window.scrollTo(this.initScrollX, this.initScrollY);
		}

		this._cleanUpContentIDs();

		// Initialized will be set to false
		this.initialized = false;
		this.event("afterHide"); // Passing afterHide callback
		this.setOptions(this._options); // Settings options object into initial state
	},

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

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

	_prepareIEHtml: function(height, overflow) {
		// IE6 requires width and height set to 100% and overflow hidden
		$$('html, body').invoke('setStyle', {
			width: height,
			height: height,
			overflow: overflow
		});
	},

	_prepareIESelects: function(visibility, prefix) {
		// Toggle visibility for select elements
		$$((prefix || "") + "select").invoke('setStyle', {
			'visibility': visibility
		});
	},

	event: function(eventName) {
		var r = true;
		if (this.options[eventName]) {
			var returnValue = this.options[eventName](); // Executing callback
			this.options[eventName] = null; // Removing callback after execution
			if (!Object.isUndefined(returnValue))
				r = returnValue;
		}
		return r;
	}
};

Object.extend(Modalbox, Modalbox.Methods);

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