/**
 * jQuery lightBox plugin
 * This jQuery plugin was inspired and based on Lightbox 2 by Lokesh Dhakar (http://www.huddletogether.com/projects/lightbox2/)
 * and adapted to me for use like a plugin from jQuery.
 * @name jquery-lightbox-0.5.js
 * @author Leandro Vieira Pinho - http://leandrovieira.com
 * @version 0.5
 * @date April 11, 2008
 * @category jQuery plugin
 * @copyright (c) 2008 Leandro Vieira Pinho (leandrovieira.com)
 * @license CC Attribution-No Derivative Works 2.5 Brazil - http://creativecommons.org/licenses/by-nd/2.5/br/deed.en_US
 * @example Visit http://leandrovieira.com/projects/jquery/lightbox/ for more informations about this jQuery plugin
 */
// Offering a Custom Alias suport - More info: http://docs.jquery.com/Plugins/Authoring#Custom_Alias
(function($){
	/** $ is an alias to jQuery object */
	$.fn.lightBox = function(settings){
		// Settings to configure the jQuery lightBox plugin how you like
		settings = jQuery.extend({
			// Configuration related to overlay
			overlayBgColor: 		'#000',		// (string) Background color to overlay; inform a hexadecimal value like: #RRGGBB. Where RR, GG, and BB are the hexadecimal values for the red, green, and blue values of the color.
			overlayOpacity:			0.8,		// (integer) Opacity value to overlay; inform: 0.X. Where X are number from 0 to 9
			// Configuration related to navigation
			fixedNavigation:		false,		// (boolean) Boolean that informs if the navigation (next and prev button) will be fixed or not in the interface.
			// Configuration related to images
			imageLoading:			'js/images/lightbox-ico-loading.gif',	// (string) Path and the name of the loading icon
			imageBtnPrev:			'js/images/lightbox-btn-prev.gif',		// (string) Path and the name of the prev button image
			imageBtnNext:			'js/images/lightbox-btn-next.gif',		// (string) Path and the name of the next button image
			imageBtnClose:			'js/images/lightbox-btn-close.gif',		// (string) Path and the name of the close btn
			imageBlank:				'js/images/lightbox-blank.gif',			// (string) Path and the name of a blank image (one pixel)
			// Configuration related to container image box
			containerBorderSize:	10,			// (integer) If you adjust the padding in the CSS for the container, #lightbox-container-image-box, you will need to update this value
			containerResizeSpeed:	400,		// (integer) Specify the resize duration of container image. These number are miliseconds. 400 is default.
			// Configuration related to texts in caption. For example: Image 2 of 8. You can alter either "Image" and "of" texts.
			txtImage:				'Imagem',	// (string) Specify text "Image"
			txtOf:					'de',		// (string) Specify text "of"
			// Configuration related to keyboard navigation
			keyToClose:				'c',		// (string) (c = close) Letter to close the jQuery lightBox interface. Beyond this letter, the letter X and the SCAPE key is used to.
			keyToPrev:				'p',		// (string) (p = previous) Letter to show the previous image
			keyToNext:				'n',		// (string) (n = next) Letter to show the next image.
			// Donīt alter these variables in any way
			imageArray:				[],
			activeImage:			0
		},settings);
		// Caching the jQuery object with all elements matched
		//var jQueryMatchedObj = this; // This, in this context, refer to jQuery object
		var jQueryMatchedObj = $('a[@rel*=lightbox]'); // This, in this context, refer to jQuery object
		/**
		 * Initializing the plugin calling the start function
		 * @return boolean false
		 */
		function _initialize(){
			_start(this,jQueryMatchedObj); // This, in this context, refer to object (link) which the user have clicked
			return false; // Avoid the browser following the link
		}
		/**
		 * Start the jQuery lightBox plugin
		 * @param object objClicked The object (link) whick the user have clicked
		 * @param object jQueryMatchedObj The jQuery object with all elements matched
		 */
		function _start(objClicked,jQueryMatchedObj){
			// Hime some elements to avoid conflict with overlay in IE. These elements appear above the overlay.
			$('embed, object, select').css({ 'visibility' : 'hidden' });
			// Call the function to create the markup structure; style some elements; assign events in some elements.
			_set_interface();
			// Unset total images in imageArray
			settings.imageArray.length = 0;
			// Unset image active information
			settings.activeImage = 0;
			// We have an image set? Or just an image? Letīs see it.
			if(jQueryMatchedObj.length == 1){
				settings.imageArray.push(new Array(objClicked.getAttribute('href'),objClicked.getAttribute('title')));
			}
			else{
				// Add an Array (as many as we have), with href and title atributes, inside the Array that storage the images references		
				for(var i=0; i<jQueryMatchedObj.length; i++){
					if(i == 0) settings.imageArray.push(new Array(jQueryMatchedObj[i].getAttribute('href'),jQueryMatchedObj[i].getAttribute('title')));
					else settings.imageArray.push(new Array(jQueryMatchedObj[i].getAttribute('title'),jQueryMatchedObj[i].getAttribute('alt')));
				}
			}
			while(settings.imageArray[settings.activeImage][0] != objClicked.getAttribute('href')){ settings.activeImage++; }
			// Call the function that prepares image exibition
			_set_image_to_view();
		}
		/** Create the jQuery lightBox plugin interface */
		function _set_interface(){
			// Apply the HTML markup into body tag
			$('body').append('<div id="jquery-overlay"></div><div id="jquery-lightbox"><div id="lightbox-container-image-box"><div id="lightbox-container-image"><img id="lightbox-image"><div style="" id="lightbox-nav"><a href="#" id="lightbox-nav-btnPrev"></a><a href="#" id="lightbox-nav-btnNext"></a></div><div id="lightbox-loading"><a href="#" id="lightbox-loading-link"><img src="' + settings.imageLoading + '"></a></div></div></div><div id="lightbox-container-image-data-box"><div id="lightbox-container-image-data"><div id="lightbox-image-details"><span id="lightbox-image-details-caption"></span><span id="lightbox-image-details-currentNumber"></span></div><div id="lightbox-secNav"><a href="#" id="lightbox-secNav-btnClose"><img src="' + settings.imageBtnClose + '"></a></div></div></div></div>');	
			// Get page sizes
			var arrPageSizes = ___getPageSize();
			// Style overlay and show it
			$('#jquery-overlay').css({
				backgroundColor:	settings.overlayBgColor,
				opacity:			settings.overlayOpacity,
				width:				arrPageSizes[0],
				height:				arrPageSizes[1]
			}).fadeIn();
			// Get page scroll
			var arrPageScroll = ___getPageScroll();
			// Calculate top and left offset for the jquery-lightbox div object and show it
			$('#jquery-lightbox').css({
				top:	arrPageScroll[1]+(arrPageSizes[3]/10),
				left:	arrPageScroll[0]
			}).show();
			// Assigning click events in elements to close overlay
			$('#jquery-overlay,#jquery-lightbox').click(function(){ _finish(); });
			// Assign the _finish function to lightbox-loading-link and lightbox-secNav-btnClose objects
			$('#lightbox-loading-link,#lightbox-secNav-btnClose').click(function(){
				_finish();
				return false;
			});
			// If window was resized, calculate the new overlay dimensions
			$(window).resize(function(){
				// Get page sizes
				var arrPageSizes = ___getPageSize();
				// Style overlay and show it
				$('#jquery-overlay').css({
					width:		arrPageSizes[0],
					height:		arrPageSizes[1]
				});
				// Get page scroll
				var arrPageScroll = ___getPageScroll();
				// Calculate top and left offset for the jquery-lightbox div object and show it
				$('#jquery-lightbox').css({
					top:	arrPageScroll[1]+(arrPageSizes[3]/10),
					left:	arrPageScroll[0]
				});
			});
		}
		/** Prepares image exibition; doing a imageīs preloader to calculate itīs size */
		function _set_image_to_view(){ // show the loading
			// Show the loading
			$('#lightbox-loading').show();
			if(settings.fixedNavigation){
				$('#lightbox-image,#lightbox-container-image-data-box,#lightbox-image-details-currentNumber').hide();
			}
			else{
				// Hide some elements
				$('#lightbox-image,#lightbox-nav,#lightbox-nav-btnPrev,#lightbox-nav-btnNext,#lightbox-container-image-data-box,#lightbox-image-details-currentNumber').hide();
			}
			// Image preload process
			var objImagePreloader = new Image();
			objImagePreloader.onload = function(){
				$('#lightbox-image').attr('src',settings.imageArray[settings.activeImage][0]);
				// Perfomance an effect in the image container resizing it
				_resize_container_image_box(objImagePreloader.width,objImagePreloader.height);
				//	clear onLoad, IE behaves irratically with animated gifs otherwise
				objImagePreloader.onload=function(){};
			};
			objImagePreloader.src = settings.imageArray[settings.activeImage][0];
		};
		/**
		 * Perfomance an effect in the image container resizing it
		 * @param integer intImageWidth The imageīs width that will be showed
		 * @param integer intImageHeight The imageīs height that will be showed
		 */
		function _resize_container_image_box(intImageWidth,intImageHeight){
			// Get current width and height
			var intCurrentWidth = $('#lightbox-container-image-box').width();
			var intCurrentHeight = $('#lightbox-container-image-box').height();
			// Get the width and height of the selected image plus the padding
			var intWidth = (intImageWidth+(settings.containerBorderSize * 2)); // Plus the imageīs width and the left and right padding value
			var intHeight = (intImageHeight+(settings.containerBorderSize * 2)); // Plus the imageīs height and the left and right padding value
			// Diferences
			var intDiffW = intCurrentWidth - intWidth;
			var intDiffH = intCurrentHeight - intHeight;
			// Perfomance the effect
			$('#lightbox-container-image-box').animate({ width: intWidth, height: intHeight },settings.containerResizeSpeed,function(){ _show_image(); });
			if((intDiffW == 0)&&(intDiffH == 0)){
				if($.browser.msie){ ___pause(250); }
				else{ ___pause(100); }
			} 
			$('#lightbox-container-image-data-box').css({ width: intImageWidth });
			$('#lightbox-nav-btnPrev,#lightbox-nav-btnNext').css({ height: intImageHeight + (settings.containerBorderSize * 2) });
		};
		/** Show the prepared image */
		function _show_image(){
			$('#lightbox-loading').hide();
			$('#lightbox-image').fadeIn(function(){
				_show_image_data();
				_set_navigation();
			});
			_preload_neighbor_images();
		};
		/** Show the image information */
		function _show_image_data(){
			$('#lightbox-container-image-data-box').slideDown('fast');
			$('#lightbox-image-details-caption').hide();
			if(settings.imageArray[settings.activeImage][1]){
				$('#lightbox-image-details-caption').html(settings.imageArray[settings.activeImage][1]).show();
			}
			// If we have a image set, display 'Image X of X'
			if(settings.imageArray.length > 1){
				$('#lightbox-image-details-currentNumber').html(settings.txtImage+' '+(settings.activeImage+1)+' '+settings.txtOf+' '+settings.imageArray.length).show();
			}		
 		}
		/** Display the button navigations */
		function _set_navigation(){
			$('#lightbox-nav').show();
			// Instead to define this configuration in CSS file, we define here. And itīs need to IE. Just.
			$('#lightbox-nav-btnPrev,#lightbox-nav-btnNext').css({ 'background' : 'transparent url('+settings.imageBlank+') no-repeat' });
			// Show the prev button, if not the first image in set
			if(settings.activeImage != 0){
				if(settings.fixedNavigation){
					$('#lightbox-nav-btnPrev').css({ 'background' : 'url('+settings.imageBtnPrev+') left 15% no-repeat' })
						.unbind()
						.bind('click',function(){
							settings.activeImage = settings.activeImage-1;
							_set_image_to_view();
							return false;
						});
				}
				else{
					// Show the images button for Next buttons
					$('#lightbox-nav-btnPrev').unbind().hover(function(){
						$(this).css({ 'background' : 'url('+settings.imageBtnPrev+') left 15% no-repeat' });
					},function(){
						$(this).css({ 'background' : 'transparent url('+settings.imageBlank+') no-repeat' });
					}).show().bind('click',function(){
						settings.activeImage = settings.activeImage-1;
						_set_image_to_view();
						return false;
					});
				}
			}
			// Show the next button, if not the last image in set
			if(settings.activeImage != (settings.imageArray.length-1)){
				if(settings.fixedNavigation){
					$('#lightbox-nav-btnNext').css({ 'background' : 'url('+settings.imageBtnNext+') right 15% no-repeat' })
						.unbind()
						.bind('click',function(){
							settings.activeImage = settings.activeImage+1;
							_set_image_to_view();
							return false;
						});
				}
				else{
					// Show the images button for Next buttons
					$('#lightbox-nav-btnNext').unbind().hover(function(){
						$(this).css({ 'background' : 'url('+settings.imageBtnNext+') right 15% no-repeat' });
					},function(){
						$(this).css({ 'background' : 'transparent url('+settings.imageBlank+') no-repeat' });
					}).show().bind('click',function(){
						settings.activeImage = settings.activeImage+1;
						_set_image_to_view();
						return false;
					});
				}
			}
			// Enable keyboard navigation
			_enable_keyboard_navigation();
		}
		/** Enable a support to keyboard navigation */
		function _enable_keyboard_navigation(){
			$(document).keydown(function(objEvent){ _keyboard_action(objEvent); });
		}
		/** Disable the support to keyboard navigation */
		function _disable_keyboard_navigation(){ $(document).unbind(); }
		/** Perform the keyboard actions*/
		function _keyboard_action(objEvent) {
			// To ie
			if(objEvent == null){
				keycode = event.keyCode;
				escapeKey = 27;
			// To Mozilla
			}
			else{
				keycode = objEvent.keyCode;
				escapeKey = objEvent.DOM_VK_ESCAPE;
			}
			// Get the key in lower case form
			key = String.fromCharCode(keycode).toLowerCase();
			// Verify the keys to close the ligthBox
			if((key == settings.keyToClose)||(key == 'x')||(keycode == escapeKey)){ _finish(); }
			// Verify the key to show the previous image
			if((key == settings.keyToPrev)||(keycode == 37)){
				// If weīre not showing the first image, call the previous
				if(settings.activeImage != 0){
					settings.activeImage = settings.activeImage-1;
					_set_image_to_view();
					_disable_keyboard_navigation();
				}
			}
			// Verify the key to show the next image
			if((key == settings.keyToNext)||(keycode == 39)){
				// If weīre not showing the last image, call the next
				if(settings.activeImage != (settings.imageArray.length-1)){
					settings.activeImage = settings.activeImage+1;
					_set_image_to_view();
					_disable_keyboard_navigation();
				}
			}
		}
		/** Preload prev and next images being showed */
		function _preload_neighbor_images(){
			if((settings.imageArray.length -1) > settings.activeImage){
				objNext = new Image();
				objNext.src = settings.imageArray[settings.activeImage+1][0];
			}
			if(settings.activeImage > 0){
				objPrev = new Image();
				objPrev.src = settings.imageArray[settings.activeImage-1][0];
			}
		}
		/** Remove jQuery lightBox plugin HTML markup */
		function _finish(){
			$('#jquery-lightbox').remove();
			$('#jquery-overlay').fadeOut(function(){ $('#jquery-overlay').remove(); });
			// Show some elements to avoid conflict with overlay in IE. These elements appear above the overlay.
			$('embed, object, select').css({ 'visibility' : 'visible' });
		}
		/**
		 / THIRD FUNCTION
		 * getPageSize() by quirksmode.com
		 * @return Array Return an array with page width, height and window width, height
		 */
		function ___getPageSize(){
			var xScroll, yScroll;
			if(window.innerHeight && window.scrollMaxY){
				xScroll = window.innerWidth + window.scrollMaxX;
				yScroll = window.innerHeight + window.scrollMaxY;
			}
			else if(document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
				xScroll = document.body.scrollWidth;
				yScroll = document.body.scrollHeight;
			}
			else{ // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
				xScroll = document.body.offsetWidth;
				yScroll = document.body.offsetHeight;
			}
			var windowWidth, windowHeight;
			if(self.innerHeight){	// all except Explorer
				if(document.documentElement.clientWidth){ windowWidth = document.documentElement.clientWidth; }
				else{ windowWidth = self.innerWidth; }
				windowHeight = self.innerHeight;
			}
			else if(document.documentElement && document.documentElement.clientHeight){ // Explorer 6 Strict Mode
				windowWidth = document.documentElement.clientWidth;
				windowHeight = document.documentElement.clientHeight;
			}
			else if(document.body){ // other Explorers
				windowWidth = document.body.clientWidth;
				windowHeight = document.body.clientHeight;
			}	
			// for small pages with total height less then height of the viewport
			if(yScroll < windowHeight){ pageHeight = windowHeight; }
			else{ pageHeight = yScroll; }
			// for small pages with total width less then width of the viewport
			if(xScroll < windowWidth){ pageWidth = xScroll; }
			else{ pageWidth = windowWidth; }
			arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight);
			return arrayPageSize;
		};
		/**
		 / THIRD FUNCTION
		 * getPageScroll() by quirksmode.com
		 * @return Array Return an array with x,y page scroll values.
		 */
		function ___getPageScroll(){
			var xScroll, yScroll;
			if(self.pageYOffset){
				yScroll = self.pageYOffset;
				xScroll = self.pageXOffset;
			}
			else if(document.documentElement && document.documentElement.scrollTop){	 // Explorer 6 Strict
				yScroll = document.documentElement.scrollTop;
				xScroll = document.documentElement.scrollLeft;
			}
			else if(document.body){// all other Explorers
				yScroll = document.body.scrollTop;
				xScroll = document.body.scrollLeft;	
			}
			arrayPageScroll = new Array(xScroll,yScroll);
			return arrayPageScroll;
		};
		/** Stop the code execution from a escified time in milisecond */
		 function ___pause(ms){
			var date = new Date(); 
			curDate = null;
			do{ var curDate = new Date(); }
			while(curDate - date < ms);
		 };
		// Return the jQuery object for chaining. The unbind method is used to avoid click conflict when the plugin is called more than once
		return this.unbind('click').click(_initialize);
	};
})(jQuery); // Call and execute the function immediately passing the jQuery object