/* jQuery Carousel 0.9.1
   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: '<span role="button"></span>',
            prevBtn: '<span role="button"></span>',
            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",
            callback: function() { },
            useAddress: false,
            adressIdentifier: "carousel"
        }, 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.$elts.nextBtn.addClass("carousel-control next carousel-next");
            env.$elts.prevBtn.addClass("carousel-control previous carousel-previous");

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

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

            // Address plugin
            initAddress(env);

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

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

                // Width 1/3 : 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 = $firstItem.outerHeight();

                // 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.$elts.paginationBtns.length + 1) + '</span></a>').data("firstStep", i));
            }
        });

        env.$elts.paginationBtns.appendTo(env.$elts.pagination);

        env.$elts.paginationBtns.slice(0, 1).addClass("active");

        // Events
        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.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) {
                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);