/**
 * jQuery Galleriffic plugin
 *
 * Copyright (c) 2008 Trent Foley (http://trentacular.com)
 * Licensed under the MIT License:
 *   http://www.opensource.org/licenses/mit-license.php
 *
 * Much thanks to primary contributer Ponticlaro (http://www.ponticlaro.com)
 */
;(function($) {
	// Globally keep track of all images by their unique hash.  Each item is an image data object.
	var allImages = {};
	var imageCounter = 0;

	// Galleriffic static class
	$.galleriffic = {
		version: '2.0.1',

		// Strips invalid characters and any leading # characters
		normalizeHash: function(hash) {
			return hash.replace(/^.*#/, '').replace(/\?.*$/, '');
		},

		getImage: function(hash) {
			if (!hash)
				return undefined;

			hash = $.galleriffic.normalizeHash(hash);
			return allImages[hash];
		},

		// Global function that looks up an image by its hash and displays the image.
		// Returns false when an image is not found for the specified hash.
		// @param {String} hash This is the unique hash value assigned to an image.
		gotoImage: function(hash) {
			var imageData = $.galleriffic.getImage(hash);
			if (!imageData)
				return false;

			var gallery = imageData.gallery;
			gallery.gotoImage(imageData);
			
			return true;
		},

		// Removes an image from its respective gallery by its hash.
		// Returns false when an image is not found for the specified hash or the
		// specified owner gallery does match the located images gallery.
		// @param {String} hash This is the unique hash value assigned to an image.
		// @param {Object} ownerGallery (Optional) When supplied, the located images
		// gallery is verified to be the same as the specified owning gallery before
		// performing the remove operation.
		removeImageByHash: function(hash, ownerGallery) {
			var imageData = $.galleriffic.getImage(hash);
			if (!imageData)
				return false;

			var gallery = imageData.gallery;
			if (ownerGallery && ownerGallery != gallery)
				return false;

			return gallery.removeImageByIndex(imageData.index);
		}
	};

	var defaults = {
		delay:                     3000,
		numThumbs:                 20,
		preloadAhead:              40, // Set to -1 to preload all images
		enableTopPager:            false,
		enableBottomPager:         true,
		maxPagesToShow:            7,
		imageContainerSel:         '',
		captionContainerSel:       '',
		controlsContainerSel:      '',
		loadingContainerSel:       '',
		renderSSControls:          true,
		renderNavControls:         true,
		playLinkText:              'Play',
		pauseLinkText:             'Pause',
		prevLinkText:              'Previous',
		nextLinkText:              'Next',
		nextPageLinkText:          'Next ›',
		prevPageLinkText:          '‹ Prev',
		enableHistory:             false,
		enableKeyboardNavigation:  true,
		autoStart:                 false,
		syncTransitions:           false,
		defaultTransitionDuration: 1000,
		onSlideChange:             undefined, // accepts a delegate like such: function(prevIndex, nextIndex) { ... }
		onTransitionOut:           undefined, // accepts a delegate like such: function(slide, caption, isSync, callback) { ... }
		onTransitionIn:            undefined, // accepts a delegate like such: function(slide, caption, isSync) { ... }
		onPageTransitionOut:       undefined, // accepts a delegate like such: function(callback) { ... }
		onPageTransitionIn:        undefined, // accepts a delegate like such: function() { ... }
		onImageAdded:              undefined, // accepts a delegate like such: function(imageData, $li) { ... }
		onImageRemoved:            undefined  // accepts a delegate like such: function(imageData, $li) { ... }
	};

	// Primary Galleriffic initialization function that should be called on the thumbnail container.
	$.fn.galleriffic = function(settings) {
		//  Extend Gallery Object
		$.extend(this, {
			// Returns the version of the script
			version: $.galleriffic.version,

			// Current state of the slideshow
			isSlideshowRunning: false,
			slideshowTimeout: undefined,

			// This function is attached to the click event of generated hyperlinks within the gallery
			clickHandler: function(e, link) {
				this.pause();

				if (!this.enableHistory) {
					// The href attribute holds the unique hash for an image
					var hash = $.galleriffic.normalizeHash($(link).attr('href'));
					$.galleriffic.gotoImage(hash);
					e.preventDefault();
				}
			},

			// Appends an image to the end of the set of images.  Argument listItem can be either a jQuery DOM element or arbitrary html.
			// @param listItem Either a jQuery object or a string of html of the list item that is to be added to the gallery.
			appendImage: function(listItem) {
				this.addImage(listItem, false, false);
				return this;
			},

			// Inserts an image into the set of images.  Argument listItem can be either a jQuery DOM element or arbitrary html.
			// @param listItem Either a jQuery object or a string of html of the list item that is to be added to the gallery.
			// @param {Integer} position The index within the gallery where the item shouold be added.
			insertImage: function(listItem, position) {
				this.addImage(listItem, false, true, position);
				return this;
			},

			// Adds an image to the gallery and optionally inserts/appends it to the DOM (thumbExists)
			// @param listItem Either a jQuery object or a string of html of the list item that is to be added to the gallery.
			// @param {Boolean} thumbExists Specifies whether the thumbnail already exists in the DOM or if it needs to be added.
			// @param {Boolean} insert Specifies whether the the image is appended to the end or inserted into the gallery.
			// @param {Integer} position The index within the gallery where the item shouold be added.
			addImage: function(listItem, thumbExists, insert, position) {
				var $li = ( typeof listItem === "string" ) ? $(listItem) : listItem;				
				var $aThumb = $li.find('a.thumb');
				var slideUrl = $aThumb.attr('href');
				var title = $aThumb.attr('title');
				var $caption = $li.find('.caption').remove();
				var hash = $aThumb.attr('name');

				// Increment the image counter
				imageCounter++;

				// Autogenerate a hash value if none is present or if it is a duplicate
				if (!hash || allImages[''+hash]) {
					hash = imageCounter;
				}

				// Set position to end when not specified
				if (!insert)
					position = this.data.length;
				
				var imageData = {
					title:title,
					slideUrl:slideUrl,
					caption:$caption,
					hash:hash,
					gallery:this,
					index:position
				};

				// Add the imageData to this gallery's array of images
				if (insert) {
					this.data.splice(position, 0, imageData);

					// Reset index value on all imageData objects
					this.updateIndices(position);
				}
				else {
					this.data.push(imageData);
				}

				var gallery = this;

				// Add the element to the DOM
				if (!thumbExists) {
					// Update thumbs passing in addition post transition out handler
					this.updateThumbs(function() {
						var $thumbsUl = gallery.find('ul.thumbs');
						if (insert)
							$thumbsUl.children(':eq('+position+')').before($li);
						else
							$thumbsUl.append($li);
						
						if (gallery.onImageAdded)
							gallery.onImageAdded(imageData, $li);
					});
				}

				// Register the image globally
				allImages[''+hash] = imageData;

				// Setup attributes and click handler
				$aThumb.attr('rel', 'history')
					.attr('href', '#'+hash)
					.removeAttr('name')
					.click(function(e) {
						gallery.clickHandler(e, this);
					});

				return this;
			},

			// Removes an image from the gallery based on its index.
			// Returns false when the index is out of range.
			removeImageByIndex: function(index) {
				if (index < 0 || index >= this.data.length)
					return false;
				
				var imageData = this.data[index];
				if (!imageData)
					return false;
				
				this.removeImage(imageData);
				
				return true;
			},

			// Convenience method that simply calls the global removeImageByHash method.
			removeImageByHash: function(hash) {
				return $.galleriffic.removeImageByHash(hash, this);
			},

			// Removes an image from the gallery.
			removeImage: function(imageData) {
				var index = imageData.index;
				
				// Remove the image from the gallery data array
				this.data.splice(index, 1);
				
				// Remove the global registration
				delete allImages[''+imageData.hash];
				
				// Remove the image's list item from the DOM
				this.updateThumbs(function() {
					var $li = gallery.find('ul.thumbs')
						.children(':eq('+index+')')
						.remove();

					if (gallery.onImageRemoved)
						gallery.onImageRemoved(imageData, $li);
				});

				// Update each image objects index value
				this.updateIndices(index);

				return this;
			},

			// Updates the index values of the each of the images in the gallery after the specified index
			updateIndices: function(startIndex) {
				for (i = startIndex; i < this.data.length; i++) {
					this.data[i].index = i;
				}
				
				return this;
			},

			// Scraped the thumbnail container for thumbs and adds each to the gallery
			initializeThumbs: function() {
				this.data = [];
				var gallery = this;

				this.find('ul.thumbs > li').each(function(i) {
					gallery.addImage($(this), true, false);
				});

				return this;
			},

			isPreloadComplete: false,

			// Initalizes the image preloader
			preloadInit: function() {
				if (this.preloadAhead == 0) return this;
				
				this.preloadStartIndex = this.currentImage.index;
				var nextIndex = this.getNextIndex(this.preloadStartIndex);
				return this.preloadRecursive(this.preloadStartIndex, nextIndex);
			},

			// Changes the location in the gallery the preloader should work
			// @param {Integer} index The index of the image where the preloader should restart at.
			preloadRelocate: function(index) {
				// By changing this startIndex, the current preload script will restart
				this.preloadStartIndex = index;
				return this;
			},

			// Recursive function that performs the image preloading
			// @param {Integer} startIndex The index of the first image the current preloader started on.
			// @param {Integer} currentIndex The index of the current image to preload.
			preloadRecursive: function(startIndex, currentIndex) {
				// Check if startIndex has been relocated
				if (startIndex != this.preloadStartIndex) {
					var nextIndex = this.getNextIndex(this.preloadStartIndex);
					return this.preloadRecursive(this.preloadStartIndex, nextIndex);
				}

				var gallery = this;

				// Now check for preloadAhead count
				var preloadCount = currentIndex - startIndex;
				if (preloadCount < 0)
					preloadCount = this.data.length-1-startIndex+currentIndex;
				if (this.preloadAhead >= 0 && preloadCount > this.preloadAhead) {
					// Do this in order to keep checking for relocated start index
					setTimeout(function() { gallery.preloadRecursive(startIndex, currentIndex); }, 500);
					return this;
				}

				var imageData = this.data[currentIndex];
				if (!imageData)
					return this;

				// If already loaded, continue
				if (imageData.image)
					return this.preloadNext(startIndex, currentIndex); 
				
				// Preload the image
				var image = new Image();
				
				image.onload = function() {
					imageData.image = this;
					gallery.preloadNext(startIndex, currentIndex);
				};

				image.alt = imageData.title;
				image.src = imageData.slideUrl;

				return this;
			},
			
			// Called by preloadRecursive in order to preload the next image after the previous has loaded.
			// @param {Integer} startIndex The index of the first image the current preloader started on.
			// @param {Integer} currentIndex The index of the current image to preload.
			preloadNext: function(startIndex, currentIndex) {
				var nextIndex = this.getNextIndex(currentIndex);
				if (nextIndex == startIndex) {
					this.isPreloadComplete = true;
				} else {
					// Use setTimeout to free up thread
					var gallery = this;
					setTimeout(function() { gallery.preloadRecursive(startIndex, nextIndex); }, 100);
				}

				return this;
			},

			// Safe way to get the next image index relative to the current image.
			// If the current image is the last, returns 0
			getNextIndex: function(index) {
				var nextIndex = index+1;
				if (nextIndex >= this.data.length)
					nextIndex = 0;
				return nextIndex;
			},

			// Safe way to get the previous image index relative to the current image.
			// If the current image is the first, return the index of the last image in the gallery.
			getPrevIndex: function(index) {
				var prevIndex = index-1;
				if (prevIndex < 0)
					prevIndex = this.data.length-1;
				return prevIndex;
			},

			// Pauses the slideshow
			pause: function() {
				this.isSlideshowRunning = false;
				if (this.slideshowTimeout) {
					clearTimeout(this.slideshowTimeout);
					this.slideshowTimeout = undefined;
				}

				if (this.$controlsContainer) {
					this.$controlsContainer
						.find('div.ss-controls a').removeClass().addClass('play')
						.attr('title', this.playLinkText)
						.attr('href', '#play')
						.html(this.playLinkText);
				}
				
				return this;
			},

			// Plays the slideshow
			play: function() {
				this.isSlideshowRunning = true;

				if (this.$controlsContainer) {
					this.$controlsContainer
						.find('div.ss-controls a').removeClass().addClass('pause')
						.attr('title', this.pauseLinkText)
						.attr('href', '#pause')
						.html(this.pauseLinkText);
				}

				if (!this.slideshowTimeout) {
					var gallery = this;
					this.slideshowTimeout = setTimeout(function() { gallery.ssAdvance(); }, this.delay);
				}

				return this;
			},

			// Toggles the state of the slideshow (playing/paused)
			toggleSlideshow: function() {
				if (this.isSlideshowRunning)
					this.pause();
				else
					this.play();

				return this;
			},

			// Advances the slideshow to the next