/**
 * @author Stéphane Roucheray 
 * @extends jquery
 */


jQuery.fn.carousel = function(options){
	
	defaults = {
		next:'#next',
		previous:'#previous',
		autoscroll:true,
		time:5000
	};

	jQuery.extend(defaults, options);
	var setting = defaults;
	//alert(setting.autoscrol
	var sliderList = jQuery(this).children()[0];
	if (sliderList) {
		var increment = jQuery(sliderList).children().outerWidth("true"),
		elmnts = jQuery(sliderList).children(),
		numElmts = elmnts.length,
		sizeFirstElmnt = increment,
		shownInViewport = Math.round(jQuery(this).width() / sizeFirstElmnt),
		firstElementOnViewPort = 1,
		isAnimating = false,
		isHover = false;

		jQuery(this).mouseenter(function(){
			isHover = true;
		});
		jQuery(this).mouseleave(function(){
			isHover = false;
		});
		for (i = 0; i < shownInViewport; i++) {
			jQuery(sliderList).css('width',(numElmts+shownInViewport)*increment + increment + "px");
			jQuery(sliderList).append(jQuery(elmnts[i]).clone());
		}
		$(this).find('a.post_title').css('opacity',1).stop(true,false).animate({opacity:'0'}, 500);
		jQuery(sliderList).find('.item').bind('mouseenter', function(){
			$(this).find('a.post_title').css('opacity',0).stop(true,false).animate({opacity:'1'}, 200);
		});
		jQuery(sliderList).find('.item').bind('mouseleave', function(){
			$(this).find('a.post_title').css('opacity',1).stop(true,false).animate({opacity:'0'}, 500);
		});		
		
		jQuery(setting.previous).click(function(event){
			if (!isAnimating) {
				if (firstElementOnViewPort == 1) {
					jQuery(sliderList).css('left', "-" + numElmts * sizeFirstElmnt + "px");
					firstElementOnViewPort = numElmts;
				}
				else {
					firstElementOnViewPort--;
				}
				
				jQuery(sliderList).animate({
					left: "+=" + increment,
					y: 0,
					queue: true
				}, "swing", function(){isAnimating = false;});
				isAnimating = true;
			}
			
		});
		
		jQuery(setting.next).click(function(event){
			if (!isAnimating) {
				if (firstElementOnViewPort > numElmts) {
					firstElementOnViewPort = 2;
					jQuery(sliderList).css('left', "0px");
				}
				else {
					firstElementOnViewPort++;
				}
				jQuery(sliderList).animate({
					left: "-=" + increment,
					y: 0,
					queue: true
				}, "swing", function(){isAnimating = false;});
				isAnimating = true;
			}
		});
		//jQuery(next).click(moveNext);
		moveNext =  function(){
			//alert('tesd');
			if (!isAnimating && !isHover  && setting.autoscroll) {
				if (firstElementOnViewPort > numElmts) {
					firstElementOnViewPort = 2;
					jQuery(sliderList).css('left', "0px");
				}
				else {
					firstElementOnViewPort++;
				}
				jQuery(sliderList).animate({
					left: "-=" + increment,
					y: 0,
					queue: true
				}, "swing", function(){isAnimating = false;});
				isAnimating = true;
			}										  
		}
		if ( setting.autoscroll ){
			timer = setInterval(moveNext, setting.time);
		}
	}
};