/**
 * 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
 */
(function($) {                                          // Compliant with jquery.noConflict()

    var div, ul, tLi , tl , v, o, start;
    var firstTime = 1;
    $.fn.jCarouselLite = function(o) {
        o = $.extend({
            btnPrev: null,
            btnNext: null,
            btnGo: null,
            btnMove: null,
            mouseWheel: false,
            auto: null,

            speed: 200,
            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";
            div = $(this), ul = $("ul", div), tLi = $("li", ul), tl = tLi.size(), v = o.visible, start = o.start;
            div.data('v', o.visible);
            if(o.circular && firstTime == 1) {
                ul.prepend(tLi.slice(tl-v-1+1).clone(true))
                .append(tLi.slice(0,v).clone(true));
                start += v;
            }
            firstTime = 0
            var li = $("li", ul), itemLength = li.size(), curr = 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

            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() {
                    go(curr+o.scroll);
                }, o.auto+o.speed);

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

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

                    if(o.beforeStart)
                        o.beforeStart.call(this, vis());

                    if(o.circular) {            // If circular we are in first or last, then goto the other end
                        if(to<=start-v-1) {           // If first, then goto last
                            ul.css(animCss, -((itemLength-(v*2))*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==start-v-1 ? itemLength-(v*2)-1 : itemLength-(v*2)-o.scroll;
                        } else if(to>=itemLength-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-v+1 ? v+1 : v+o.scroll;
                        } 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() {
                            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;
            };

        });


    };

    $.fn.jCarouselLite.clean = function clean()
    {
        if(firstTime == 1)
            return;
        var firstClone = $("li", ul).slice(0,v);
        var lastClone = $("li", ul).slice(0+v+tl);
        for(i = 0; i <= firstClone.length; i++)
            $(firstClone[i]).remove();

        for(i = 0; i <= lastClone.length; i++)
            $(lastClone[i]).remove();
    };

    $.fn.jCarouselLite.renew = function renew()
    {
        if(firstTime != 0)
            return;
        ul.prepend(tLi.slice(tl-v-1+1).clone(true))
        .append(tLi.slice(0,v).clone(true));
        start = 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);