/* jQuery Carousel 0.9.5
Copyright 2008-2009 Thomas Lanciaux and Pierre Bertet.
This software is licensed under the CC-GNU LGPL <http://creativecommons.org/licenses/LGPL/2.1/>
*/
; (function ($) {

	$.fn.carousel = function (params) {

		var params = $.extend({
			direction: "horizontal",
			loop: false,
			dispItems: 1,
			pagination: false,
			paginationPosition: "inside",
			nextBtn: '<a role="button">Next</a>',
			prevBtn: '<a role="button">Previous</a>',
			btnsPosition: "inside",
			nextBtnInsert: "appendTo",
			prevBtnInsert: "prependTo",
			nextBtnInsertFn: false,
			prevBtnInsertFn: false,
			autoSlide: false,
			autoSlideInterval: 3000,
			delayAutoSlide: false,
			combinedClasses: false,
			effect: "slide",
			slideEasing: "swing",
			animSpeed: "normal",
			equalWidths: "true",
			verticalMargin: 0,
			callback: function () { },
			useAddress: false,
			adressIdentifier: "carousel",
			tabLabel: function (tabNum) {
				return tabNum;
			},
			showEmptyItems: true
		}, params);
					  

		// Buttons position
		if (params.btnsPosition == "outside") {
			params.prevBtnInsert = "insertBefore";
			params.nextBtnInsert = "insertAfter";
		}

		
		// Slide delay
		params.delayAutoSlide = params.delayAutoSlide || params.autoSlideInterval;

		return this.each(function () {

			// Env object
			var env = {
				$elts: {},
				params: params,
				launchOnLoad: []
			};

                        
			// Carousel main container
			env.$elts.carousel = $(this).addClass("js");

			// Carousel content
			env.$elts.content = $(this).children().css({ position: "absolute", "top": 0 });
           
			// Content wrapper
			env.$elts.wrap = env.$elts.content.wrap('<div class="carousel-wrap"></div>').parent().css({ overflow: "hidden", position: "relative" });

			// env.steps object
			env.steps = {
				first: 0, // First step
				count: env.$elts.content.children().length // Items count
			};

			// Last visible step
			env.steps.last = env.steps.count - 1;

			// Prev Button
			if ($.isFunction(env.params.prevBtnInsertFn)) {
				env.$elts.prevBtn = env.params.prevBtnInsertFn(env.$elts);

			} else {
				env.$elts.prevBtn = $(params.prevBtn)[params.prevBtnInsert](env.$elts.carousel);
			}

			// Next Button
			if ($.isFunction(env.params.nextBtnInsertFn)) {
				env.$elts.nextBtn = env.params.nextBtnInsertFn(env.$elts);

			} else {
				env.$elts.nextBtn = $(params.nextBtn)[params.nextBtnInsert](env.$elts.carousel);
			}

			// Add buttons classes / data
			env.$elts.nextBtn.addClass("carousel-control next carousel-next disabled");
			env.$elts.prevBtn.addClass("carousel-control previous carousel-previous disabled");

			// Bind events on next / prev buttons
			initButtonsEvents(env);

			// Pagination
			if (env.params.pagination) {
				initPagination(env);
			}

			// Address plugin
			initAddress(env);

			// On document load...
			$(function () {

				//Set max Height with the highest element
				var $items = env.$elts.content.children();
				var $maxHeight = 0;

				$items.each(function () {
					$item = $(this);
                    
					$itemHeight = $item.outerHeight();
					if ($itemHeight > $maxHeight) {
						$maxHeight = $itemHeight;
					}
				});
				if (env.params.verticalMargin > 0) {
					$maxHeight = $maxHeight + env.params.verticalMargin;
				}

				$items.height($maxHeight);
				// First item
				var $firstItem = env.$elts.content.children(":first");

				// Width 1/1 : Get default item width
				env.itemWidth = $firstItem.outerWidth();

				// Width 2/3 : Define content width
				if (params.direction == "vertical") {
					env.contentWidth = env.itemWidth;

				} else {

					if (params.equalWidths) {
						env.contentWidth = env.itemWidth * env.steps.count;

					} else {
						env.contentWidth = (function () {
							var totalWidth = 0;

							env.$elts.content.children().each(function () {
								totalWidth += $(this).outerWidth();
							});

							return totalWidth;
						})();
					}
				}

       
				// Width 3/3 : Set content width to container
				env.$elts.content.width(env.contentWidth);

				// Height 1/2 : Get default item height
				env.itemHeight = $maxHeight;

				// Height 2/2 : Set content height to container
				if (params.direction == "vertical") {
					env.$elts.content.css({
						height: env.itemHeight * env.steps.count + "px"
					});
					env.$elts.content.parent().css({
						height: env.itemHeight * env.params.dispItems + "px"
					});
				} else {
					env.$elts.content.parent().css({
						height: env.itemHeight + "px"
					});
				}

                

				// Update Next / Prev buttons state
				updateButtonsState(env);

				// Launch function added to "document ready" event
				$.each(env.launchOnLoad, function (i, fn) {
					fn();
				});

				// Launch autoslide
				if (env.params.autoSlide) {
					window.setTimeout(function () {
						env.autoSlideInterval = window.setInterval(function () {
							goToStep(env, getRelativeStep(env, "next"));
						}, env.params.autoSlideInterval);
					}, env.params.delayAutoSlide);
				}

			});

		});

	};

	// Next / Prev buttons events only
	function initButtonsEvents(env) {

		env.$elts.nextBtn.add(env.$elts.prevBtn)

			.bind("enable", function () {

				var $this = $(this)
					.unbind("click")
					.bind("click", function () {
						goToStep(env, getRelativeStep(env, ($this.is(".next") ? "next" : "prev")));
						stopAutoSlide(env);
					})
					.removeClass("disabled");

				// Combined classes (IE6 compatibility)
				if (env.params.combinedClasses) {
					$this.removeClass("next-disabled previous-disabled");
				}
			})
			.bind("disable", function () {

				var $this = $(this).unbind("click").addClass("disabled");

				// Combined classes (IE6 compatibility)
				if (env.params.combinedClasses) {

					if ($this.is(".next")) {
						$this.addClass("next-disabled");

					} else if ($this.is(".previous")) {
						$this.addClass("previous-disabled");

					}
				}
			})
			.hover(function () {
				$(this).toggleClass("hover");
			});
	};

	// Pagination
	function initPagination(env) {
		env.$elts.pagination = $('<div class="center-wrap"><div class="carousel-pagination"><p></p></div></div>')[((env.params.paginationPosition == "outside") ? "insertAfter" : "appendTo")](env.$elts.carousel).find("p");
		env.$elts.paginationBtns = $([]);
		env.$elts.content.find("li").each(function (i) {
			if (i % env.params.dispItems == 0) {
				env.$elts.paginationBtns = env.$elts.paginationBtns.add($('<a role="button"><span>' + env.params.tabLabel(env.$elts.paginationBtns.length + 1) + '</span></a>').data("firstStep", i));
			}
		});
		env.$elts.paginationBtns.each(function () { $(this).appendTo(env.$elts.pagination); });
		env.$elts.paginationBtns.slice(0, 1).addClass("active");
		env.launchOnLoad.push(function () {
			env.$elts.paginationBtns.click(function (e) {
				goToStep(env, $(this).data("firstStep"));
				stopAutoSlide(env);
			});
		});
	};

	// Address plugin
	function initAddress(env) {

		if (env.params.useAddress && $.isFunction($.fn.address)) {

			$.address
				.init(function (e) {
					var pathNames = $.address.pathNames();
					if (pathNames[0] === env.params.adressIdentifier && !!pathNames[1]) {
						goToStep(env, pathNames[1] - 1);
					} else {
						$.address.value('/' + env.params.adressIdentifier + '/1');
					}
				})
				.change(function (e) {
					var pathNames = $.address.pathNames();
					if (pathNames[0] === env.params.adressIdentifier && !!pathNames[1]) {
						goToStep(env, pathNames[1] - 1);
					}
				});
		} else {
			env.params.useAddress = false;
		}
	};

	function goToStep(env, step) {

		// Callback
		env.params.callback(step);

		// Launch animation
		transition(env, step);

		// Update first step
		env.steps.first = step;

		// Update buttons status
		updateButtonsState(env);

		// Update address (jQuery Address plugin)
		if (env.params.useAddress) {
			$.address.value('/' + env.params.adressIdentifier + '/' + (step + 1));
		}

	};

	// Get next/prev step, useful for autoSlide
	function getRelativeStep(env, position) {
		if (position == "prev") {
			if (!env.params.showEmptyItems) {
				if (env.steps.first == 0) {
					return ((env.params.loop) ? (env.steps.count - env.params.dispItems) : false);
				} else {
					return Math.max(0, env.steps.first - env.params.dispItems);
				}
			} else {
				if ((env.steps.first - env.params.dispItems) >= 0) {
					return env.steps.first - env.params.dispItems;
				} else {
					return ((env.params.loop) ? (env.steps.count - env.params.dispItems) : false);
				}
			}
		} else if (position == "next") {
			if ((env.steps.first + env.params.dispItems) < env.steps.count) {
				if (!env.params.showEmptyItems) {
					return Math.min(env.steps.first + env.params.dispItems, env.steps.count - env.params.dispItems);
				} else {
					return env.steps.first + env.params.dispItems;
				}
			} else {
				return ((env.params.loop) ? 0 : false);
			}
		}
	};

	// Animation
	function transition(env, step) {

		// Effect
		switch (env.params.effect) {

			// No effect 
			case "no":
				if (env.params.direction == "vertical") {
					env.$elts.content.css("top", -(env.itemHeight * step) + "px");
				} else {
					env.$elts.content.css("left", -(env.itemWidth * step) + "px");
				}
				break;

			// Fade effect 
			case "fade":
				if (env.params.direction == "vertical") {
					env.$elts.content.hide().css("top", -(env.itemHeight * step) + "px").fadeIn(env.params.animSpeed);
				} else {
					env.$elts.content.hide().css("left", -(env.itemWidth * step) + "px").fadeIn(env.params.animSpeed);
				}
				break;

			// Slide effect 
			default:
				if (env.params.direction == "vertical") {
					env.$elts.content.stop().animate({
						top: -(env.itemHeight * step) + "px"
					}, env.params.animSpeed, env.params.slideEasing);
				} else {
					env.$elts.content.stop().animate({
						left: -(env.itemWidth * step) + "px"
					}, env.params.animSpeed, env.params.slideEasing);
				}
				break;
		}

	};

	// Update all buttons state : disabled or not
	function updateButtonsState(env) {

		if (getRelativeStep(env, "prev") !== false) {
			env.$elts.prevBtn.trigger("enable");

		} else {
			env.$elts.prevBtn.trigger("disable");
		}

		if (getRelativeStep(env, "next") !== false) {
			env.$elts.nextBtn.trigger("enable");

		} else {
			env.$elts.nextBtn.trigger("disable");
		}

		if (env.params.pagination) {
			env.$elts.paginationBtns.removeClass("active")
			.filter(function () { return ($(this).data("firstStep") == env.steps.first) }).addClass("active");
		}
	};

	// Stop autoslide
	function stopAutoSlide(env) {
		if (!!env.autoSlideInterval) {
			window.clearInterval(env.autoSlideInterval);
		}
	};

})(jQuery);