/**
 * jCarouselLite - jQuery plugin to navigate images/any content in a carousel style widget.
 * @requires jQuery v1.2 or above
 *
 * http://gmarwaha.com/jquery/jcarousellite/
 *
 * Copyright (c) 2007 Ganeshji Marwaha (gmarwaha.com)
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 *
 * Version: 1.0.1
 * Note: Requires jquery 1.2 or above from version 1.0.1
 *
 * Modded by Aidan Taylor
 * http://www.aidantaylor.net
 */

(function($) { // Compliant with jquery.noConflict()
    $.fn.jCarouselLite = function(o) {
        o = $.extend({
            btnPrev: null,
            btnNext: null,
            btnGo: null,
            mouseWheel: false,
            auto: null,

            speed: 300,
            easing: null,

            vertical: false,
            circular: false,
            visible: 2,
            start: 0.5,
            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",
				hover = false;
            var div = $(this),
                ul = $("ul", div),
                tLi = $("li", ul),
                tl = tLi.size(),
                v = o.visible;
			
			$(div).hover(function() {
				hover = true;
			}, function() {
				hover = false;
			});
			
            if (o.circular) {
                ul.prepend(tLi.slice(tl - v - 1 + 1).clone()).append(tLi.slice(0, v + 1).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"
            });
			
			$(".selected").removeClass("selected");
			temp = li.slice(curr).slice(0, v);
			$(temp[1]).addClass("selected");
			
            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
            if (o.btnPrev) {
                $(o.btnPrev).click(function() {
                    return go(curr - o.scroll);
                });
            }

            if (o.btnNext) {
                $(o.btnNext).click(function() {
                    return go(curr + o.scroll);
                });
            }

            if (o.btnGo) {
                $.each(o.btnGo, function(i, val) {
                    $(val).click(function() {
                        return go(o.circular ? o.visible + i : i);
                    });
                });
            }

            if (o.mouseWheel && div.mousewheel) {
                div.mousewheel(function(e, d) {
                    return d > 0 ? go(curr - o.scroll) : go(curr + o.scroll);
                });
            }

            if (o.auto) {
                setInterval(function() {
					if (hover != true){
						go(curr + o.scroll);
					}
                }, o.auto);
            }

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


            function go(to) {
                if (!running) {

                    if (o.beforeStart) {
                        o.beforeStart.call(this, vis());
                    }
                    if (to < 0) {
                        to = o.start;
                    }
                    if (o.circular) { // If circular we are in first or last, then goto the other end
                        if (to <= o.start - v - 1) { // If first, then goto last
                            ul.css(animCss, -((itemLength - (v * v)) * liSize) + "px");
                            // If "scroll" > 1, then the "to" might not be equal to the condition; it can be lesser depending on the number of elements.
                            curr = (to == o.start - v - 1) ? itemLength - (v * v) - 1 : itemLength - (v * v) - o.scroll + 0.5;
                        } else if (to >= itemLength - 1 - v + 1) { // If last, then goto first
                            ul.css(animCss, -((v) * liSize) + "px");
                            // If "scroll" > 1, then the "to" might not be equal to the condition; it can be greater depending on the number of elements.
                            curr = (to == itemLength - 1 - v) ? v + 1 : v + o.scroll + 0.5;
                        } else {
                            curr = to;
                        }
                    } else { // If non-circular and to points to first or last, we just return.
                        if (to < 0 || to > itemLength - v) {
                            return;
                        } else {
                            curr = to;
                        }
                    } // If neither overrides it, the curr will still be "to" and we can proceed.
                    running = true;
                    ul.animate(animCss == "left" ? {
                        left: -(curr * liSize)
                    } : {
                        top: -(curr * liSize)
                    }, o.speed, o.easing, function() {
						
						$(".selected").removeClass("selected");
						temp = li.slice(curr).slice(0, v);
						$(temp[1]).addClass("selected");
						
                        if (o.afterEnd) {
                            o.afterEnd.call(this, vis());
                        }
						
                        running = false;
                    });
                    // Disable buttons when the carousel reaches the last/first, and enable when not
                    if (!o.circular) {
                        $(o.btnPrev + "," + o.btnNext).removeClass("disabled");
                        $((curr - o.scroll < 0 && o.btnPrev) || (curr + o.scroll > itemLength - v && o.btnNext) || []).addClass("disabled");
                    }
                }
                return false;
            }
        });
    };

    function css(el, prop) {
        return parseInt($.css(el[0], prop), 0) || 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);