/**
* jQuery lightBox plugin
* @author Leandro Vieira Pinho - http://leandrovieira.com
* @version 0.5
* @copyright 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
*/
(function($) {
	$.fn.lightBox = function(settings) {
		// Configuration
		settings = jQuery.extend({
      // Variables set by user
			overlayBgColor: '#000',	// (string) Hex BG colour
			overlayOpacity:	0.6, // (integer) Opacity value to overlay: 0.X. Where X is integer from 0 to 9
			fixedNavigation: false,	// (boolean) Boolean that informs if the navigation (next and prev button) will be fixed or not in the interface.
			imageLoading: 'images/icons/loading.gif', // (string) Path of the loading icon
			imageBtnClose: 'images/buttons/close.gif', // (string) Path of the close btn
			imageBlank:	'images/icons/blank.gif', // (string) Path of blank image (one pixel)
			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.
      // Variables set by script
			imageArray:	[],
			activeImage: 0
		},settings);
		// Caching the jQuery object with all elements matched
		var jQueryMatchedObj = this; // 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) {
			$('embed, object, select').css({ 'visibility' : 'hidden' }); // Hide some elements to avoid conflict with overlay in IE
			_set_interface(); // Call the function to create the markup structure; style some elements; assign events in some elements
			settings.imageArray.length = 0; // Unset total images in imageArray
			settings.activeImage = 0; // Unset image active information
			if(jQueryMatchedObj.length == 1) {
				settings.imageArray.push(new Array(objClicked.getAttribute('href'),objClicked.getAttribute('title')));
			} else {
				for(var i=0;i<jQueryMatchedObj.length;i++) {
					settings.imageArray.push(new Array(jQueryMatchedObj[i].getAttribute('href'),jQueryMatchedObj[i].getAttribute('title')));
				}
			}
			while(settings.imageArray[settings.activeImage][0] != objClicked.getAttribute('href')) {
				settings.activeImage++;
			}
			_set_image_to_view(); // Call the function that prepares image display
		}
		/* 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 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 image?s preloader to calculate its size */
		function _set_image_to_view() { // show 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
			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 image width that will be showed
		* @param integer intImageHeight The image 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)); // Add the image width and the left and right padding value
			var intHeight = (intImageHeight + (settings.containerBorderSize * 2)); // Add the image height and the left and right padding value
			// Differences
			var intDiffW = intCurrentWidth - intWidth;
			var intDiffH = intCurrentHeight - intHeight;
			// Initialise 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 image */
		function _show_image() {
			$('#lightbox-loading').hide();
			$('#lightbox-image').fadeIn(function() {
				_show_image_data();
			});
		};
		/* 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();
			}
		}
		/* 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' });
		}
		/* 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;
		};
		/* 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 for a specified time in milliseconds */
		function ___pause(ms) {
		  var date = new Date(); 
			curDate = null;
			do { var curDate = new Date(); } while(curDate - date < ms);
		};
		return this.unbind('click').click(_initialize); // Return the jQuery object for chaining. The unbind method is used to avoid click conflicts when the plugin is called more than once
	};
})(jQuery);

$(function() { $('a[@rel*=overlay]').lightBox(); });