;(function($){
        
        $.fn.carousel = function(params){
                
                var params = $.extend({
                        direction: "horizontal",
                        loop: false,
                        dispItems: 1,
                        pagination: false,
                        paginationPosition: "inside",
                        nextBtn: "<span>Next</span>",
                        prevBtn: "<span>Previous</span>",
                        btnsPosition: "inside",
                        nextBtnInsert: "appendTo",
                        prevBtnInsert: "prependTo",
                        autoSlide: false,
                        autoSlideInterval: 3000,
                        delayAutoSlide: 3000,
                        combinedClasses: false,
                        effect: "slide",
                        slideEasing: "swing",
                        animSpeed: "normal",
                        equalWidths: "true",
                        callback: function(){}
                }, params);
                
                if (params.btnsPosition == "outside"){
                        params.prevBtnInsert = "insertBefore";
                        params.nextBtnInsert = "insertAfter";
                }
                
                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.find(">*").length // Items count
                        };
                        
                        // Last visible step
                        env.steps.last = env.steps.count - 1;
                        
                        // Next / Prev Buttons
                        env.$elts.prevBtn = $(params.prevBtn)[params.prevBtnInsert](env.$elts.carousel).addClass("carousel-control previous carousel-previous").data("firstStep", -(env.params.dispItems));
                        env.$elts.nextBtn = $(params.nextBtn)[params.nextBtnInsert](env.$elts.carousel).addClass("carousel-control next carousel-next").data("firstStep", env.params.dispItems);
                        
                        // Bind events on next / prev buttons
                        initButtonsEvents(env, function(e){
                                slide(e, this, env);
                        });
                        
                        // Pagination
                        if (env.params.pagination) initPagination(env);
                        
                        // On document+css load !
                        $(function(){
                                
                                // First item
                                var $firstItem = env.$elts.content.find(">*:eq(0)");
                                
                                // 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.find(">*").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});
                                }
                                
                                // 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(){
                                                        env.$elts.nextBtn.click();
                                                }, env.params.autoSlideInterval);
                                        }, env.params.delayAutoSlide);
                                }
                                
                        });
                        
                });
                
        };
        
        // Slide effect
        function slide(e, btn, env){
                var $btn = $(btn);
                var newFirstStep = $btn.data("firstStep");
                
                env.params.callback(newFirstStep);
                
                // Effect
                switch (env.params.effect){
                        
                        // No effect
                        case "no":
                                if (env.params.direction == "vertical"){
                                        env.$elts.content.css("top", -(env.itemHeight * newFirstStep) + "px");
                                } else {
                                        env.$elts.content.css("left", -(env.itemWidth * newFirstStep) + "px");
                                }
                                break;
                        
                        // Fade effect
                        case "fade":
                                if (env.params.direction == "vertical"){
                                        env.$elts.content.hide().css("top", -(env.itemHeight * newFirstStep) + "px").fadeIn(env.params.animSpeed);
                                } else {
                                        env.$elts.content.hide().css("left", -(env.itemWidth * newFirstStep) + "px").fadeIn(env.params.animSpeed);
                                }
                                break;
                        
                        // Slide effect
                        default:
                                if (env.params.direction == "vertical"){
                                        env.$elts.content.stop().animate({
                                                top : -(env.itemHeight * newFirstStep) + "px"
                                        }, env.params.animSpeed, env.params.slideEasing);
                                } else {
                                        env.$elts.content.stop().animate({
                                                left : -(env.itemWidth * newFirstStep) + "px"
                                        }, env.params.animSpeed, env.params.slideEasing);
                                }
                }
                
                env.steps.first = newFirstStep;
                
                updateButtonsState(env);
                
                // Stop autoslide
                if (!!e.clientX && env.autoSlideInterval){
                        window.clearInterval(env.autoSlideInterval);
                }
        };
        
        // Update all buttons state : disabled or not
        function updateButtonsState(env){
                
                env.$elts.prevBtn.data("firstStep", env.steps.first - env.params.dispItems);
                env.$elts.nextBtn.data("firstStep", env.steps.first + env.params.dispItems);
                
                if (env.$elts.prevBtn.data("firstStep") < 0) {
                        
                        if (env.params.loop && env.steps.count > env.params.dispItems) {
                                env.$elts.prevBtn.data("firstStep", env.steps.count - env.params.dispItems);
                                env.$elts.prevBtn.trigger("enable");
                        } else {
                                env.$elts.prevBtn.trigger("disable");
                        }
                        
                } else {
                        env.$elts.prevBtn.trigger("enable");
                }
                
                if (env.$elts.nextBtn.data("firstStep") >= env.steps.count) {
                        
                        if (env.params.loop && env.steps.count > env.params.dispItems) {
                                env.$elts.nextBtn.data("firstStep", 0);
                                env.$elts.nextBtn.trigger("enable");
                        } else {
                                env.$elts.nextBtn.trigger("disable");
                        }
                        
                } else {
                        env.$elts.nextBtn.trigger("enable");
                }
                
                if (env.params.pagination){
                        env.$elts.paginationBtns.removeClass("active")
                        .filter(function(){ return ($(this).data("firstStep") == env.steps.first) }).addClass("active");
                }
        };
        
        // Next / Prev buttons events only
        function initButtonsEvents(env, slideEvent){
                
                env.$elts.nextBtn.add(env.$elts.prevBtn)
                .bind("enable", function(){
                        var $this = $(this).bind("click", slideEvent).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");
                                        
                                }
                        }
                });
                
                env.$elts.nextBtn.add(env.$elts.prevBtn).hover(
                        function(){
                                $(this).addClass("hover");
                        },
                        function(){
                                $(this).removeClass("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){
                                slide( e, this, env);
                        });
                });
        };
        
})(jQuery);