/**
 * @author Bojan Mihelac/bmihelac[AT]mihelac.org
 */

(function($) {                                          // Compliant with jquery.noConflict()
$.fn.aCarousel = function(o) {
    o = $.extend({
        speed: 20,
        easing: null,

        vertical: false,
        circular: true,
        visible: 3,
        start: 0,
        scroll: 1,

        beforeStart: null,
        afterEnd: null
    }, o || {});

    return this.each(function() {                           // Returns the element collection. Chainable.

        var running = false, animCss=o.vertical?"top":"left", sizeCss=o.vertical?"height":"width";
        var div = $(this), ul = $("ul", div), tLi = $("li", ul), tl = tLi.size(), v = o.visible;
        var direction = 0;
        var speed = 1;

        ul.prepend(tLi.slice(tl-v-1+1).clone())
          .append(tLi.slice(0).clone());
        o.start += v;

        var li = $("li", ul), itemLength = li.size(), curr = o.start;
        div.css("visibility", "visible");

        li.css({overflow: "hidden", float: o.vertical ? "none" : "left"});
        ul.css({margin: "0", padding: "0", position: "relative", "list-style-type": "none", "z-index": "1"});
        div.css({overflow: "hidden", position: "relative", "z-index": "2", left: "0px"});

        var liSize = o.vertical ? height(li) : width(li);   // Full li size(incl margin)-Used for animation
        var ulSize = liSize * itemLength;                   // size of full ul(total length, not just for the visible items)
        var divSize = liSize * v;                           // size of entire div(total length for just the visible items)

        li.css({width: li.width(), height: li.height()});
        ul.css(sizeCss, ulSize+"px").css(animCss, -(curr*liSize));

        div.css(sizeCss, divSize+"px");                     // Width of the DIV. length of visible images
        
        $(this).mousemove(function(e) {
          var clientCoords = "( " + e.clientX + ", " + e.clientY + " )";
          var w = this.clientWidth;
          x_pos = e.pageX - $(div).position().left;
          dist = w / 2 - x_pos;
          if (Math.abs(dist) < 75) {
            direction = 0;
          } else {
            speed = Math.abs(Math.round(dist / (w/2) * o.speed));
            direction = (w / 2 - x_pos) > 0 ? 1 : -1;
          }
        });
        
        $(this).hover(
          function(e) {},
          function(e) {
          direction = 0;
        });

        setInterval(function() {
          if (direction == 0) {
            return;
          }
          if (ul.position().left >= speed) {
            ul.css('left', -tl*liSize + speed);
          } else if (ul.position().left < (-tl*liSize - (tl)*liSize + speed)) {
            ul.css('left', -tl*liSize - speed);
          }
          ul.css('left', ul.position().left + direction * speed);
        }, 10);
        

        function vis() {
            return li.slice(curr).slice(0,v);
        };
        
    });
};

function css(el, prop) {
    return parseInt($.css(el[0], prop)) || 0;
};
function width(el) {
    return  el[0].offsetWidth + css(el, 'marginLeft') + css(el, 'marginRight');
};
function height(el) {
    return el[0].offsetHeight + css(el, 'marginTop') + css(el, 'marginBottom');
};

})(jQuery);