(function($){
    $.fn.Slider = function(params) {
        
        var speed = (params.speed !== undefined) ? params.speed : 500;
        var interval = (params.interval !== undefined) ? params.interval : 5000;
        var auto = (params.auto !== undefined) ? params.auto : 1;
        var effect = (params.effect !== undefined) ? params.effect : 'fade';
        var addcontrols = (params.addcontrols !== undefined) ? params.addcontrols : 1;
        var livecontrols = (params.livecontrols !== undefined) ? params.livecontrols : 1;
        var externalcontrols = (params.externalcontrols !== undefined) ? params.externalcontrols : 0;
        var addnextprev = (params.addnextprev !== undefined) ? params.addnextprev : 0;
        var livenextprev = (params.livenextprev !== undefined) ? params.livenextprev : 1;

        var obj = $(this);
        var count = $(obj).find('.item').size();
        var current = 1;
        var timer = 1;
        var ready = 1;
        
        function setupEffectFade() {
            $(obj).children('.item:not(:first-child)').hide();        
        }
        
        function setupEffectSlide() {
            var window_width = $(window).width();
            var item_width = $(obj).find('.item').width();
            var item_height = $(obj).find('.item').height();
            var holder_width = item_width*count;
            var holder_height = $(obj).height();
            
            $(obj).find('.item').wrapAll($("<div />", { "class": "holder"}));
            $(obj).find('.item').css('width',window_width);
            $(obj).find('.item').css('height',holder_height);
            $(obj).children('div.holder').css('width',holder_width);
        }
        
        function doEffectFade(id) {
            $(obj).children('.item').hide();
            $(obj).children('.slide'+id).fadeIn(speed, function() {
                ready = 1;
            });
        }
        
        function doEffectSlide(id) {
            var item_width = parseInt($(obj).find('.item').width());
            var pos_crnt = parseInt($(obj).children('.holder').css('left'));
            var step = Math.abs(current-id);

            if(id<current) {
                if(id == 1) {
                    pos_next = 0;
                } else {
                    pos_next = pos_crnt+item_width*step;
                }
            } else {
                if(id == count && current == 1) {
                    pos_next = pos_crnt-item_width*(count-1);
                } else {
                    pos_next = pos_crnt-item_width*step;
                }
            }

            $(obj).children('.holder').delay(100).animate({
                left: pos_next
            },speed,function(){
                ready = 1;
            });
        }

        function sliderEffect(id) {
            if(effect == 'fade') {
                doEffectFade(id);    
            }
            
            if(effect == 'slide') {
                doEffectSlide(id);
            }
        }

        function autoSlide() {
            clearInterval(timer);
            timer = setInterval(function(){
                if(auto == 1) {
                    if(current < count) {
                        goToSlide(parseInt(current) + 1);
                    } else {
                        goToSlide(1);
                    }
                }
            }, interval);
        }

        function goToSlide(id) {         
            ready = 0; 
            sliderEffect(id);
            if(externalcontrols == 1){
                $('ul.external-controls').find('a').removeClass('active');
                $('ul.external-controls').find('.ctr'+id).parent().addClass('active');
            } else {            
                $(obj).children('ul.controls').find('a').removeClass('active');
                $(obj).children('ul.controls').find('.ctr'+id).parent().addClass('active');
            }
            current = id;
            if(auto == 1) {
                autoSlide();
            }
        }

        function addControls() {
            $(obj).append($("<ul />", { "class": "controls" }));
            for (i=1; i<=count; i++) {
                $(obj).children('ul.controls').append($("<li />")).children().last().html($("<a />", { "href": "javascript:void(0)" })).children().html($("<span />", { "class": "num ctr"+i})).children().html(i);
            }
            $(obj).children('ul.controls').prepend($("<li />")).children().first().html($("<a />", { "class": "prevnext prev", "href": "javascript:void(0)" }));
            $(obj).children('ul.controls').append($("<li />")).children().last().html($("<a />", { "class": "prevnext next", "href": "javascript:void(0)" }));
        }
        
        function liveControls() {
            $(obj).children('ul.controls').find('.ctr1').parent().addClass('active');
            $(obj).children('ul.controls').find('span.num').parent().click(function() {
                auto = 0;
                id = $(this).find('span.num').html();
                goToSlide(id);
            });
        }

        function liveExternalControls() {
            $('ul.external-controls').find('.ctr1').parent().addClass('active');
            $('ul.external-controls').find('span.num').parent().click(function() {
                auto = 0;
                id = $(this).find('span.num').html();
                goToSlide(id);
            });
        }
        
        function addNextPrev() {
            $(obj).append($("<a />", { "class": "prevnext prev", "href": "javascript:void(0)" }));
            $(obj).append($("<a />", { "class": "prevnext next", "href": "javascript:void(0)" }));
        }
        
        function liveNextPrev() {
            $(obj).find('a.prevnext').click(function() {
                if(externalcontrols == 1){
                    id = $('ul.external-controls').find('a.active').find('span.num').html();
                } else {
                    id = $(obj).children('ul.controls').find('a.active').find('span.num').html();
                }
                console.log(id);
                if($(this).hasClass('next') && ready == 1) {
                    id++;
                    if (id > count) id = 1;
                    goToSlide(id);    
                }
                if($(this).hasClass('prev') && ready == 1) {
                    id--;
                    if (id < 1) id = count;
                    goToSlide(id);
                }   
            });
        }

        return this.each(function(){

            if(effect == 'fade') {
                setupEffectFade();    
            }
            
            if(effect == 'slide') {
                setupEffectSlide();
            }
            
            if(addcontrols == 1) {
                addControls();
                liveControls();
            }
            
            if(addcontrols == 0 && livecontrols == 1) {
                liveControls();
            }

            if(externalcontrols == 1) {
                liveExternalControls();
            }
            
            if(addnextprev == 1) {
                addNextPrev();
                liveNextPrev();
            }
            
            if(addnextprev == 0 && livenextprev == 1) {
                liveNextPrev();
            }
            
            if(auto == 1) {
                autoSlide();
            }

        });
    }
})(jQuery);