/*
* 	loopedCarousel 0.5 - jQuery plugin
*	written by Nathan Searles, based on loopedSlider (http://github.com/nathansearles/loopedSlider)	
*	http://github.com/nathansearles/loopedCarousel
*
*	Copyright (c) 2009 Nathan Searles (http://nathansearles.com/)
*	Dual licensed under the MIT (MIT-LICENSE.txt)
*	and GPL (GPL-LICENSE.txt) licenses.
*
*	Built for jQuery library
*	http://jquery.com
*
*/

/*
*	markup example for $("#loopedCarousel").loopedCarousel();
*
*	<div id="loopedCarousel">	
*		<div class="container">
*			<div class="slides">
*				<div>1</div>
*				<div>2</div>
*				<div>3</div>
*				<div>4</div>
*				<div>5</div>
*				<div>6</div>
*				<div>7</div>
*				<div>8</div>
*				<div>9</div>
*				<div>10</div>
*				<div>11</div>
*				<div>12</div>
*				<div>13</div>
*				<div>14</div>
*				<div>15</div>
*			</div>
*		</div>
*		<a href="#" class="previous">previous</a>
*		<a href="#" class="next">next</a>	
*	</div>
*
*/

(function ($) {
    $.fn.loopedCarousel = function (options) {

        var defaults = {
            container: '.container',
            slides: '.slides',
            pagination: '.pagination',
            autoStart: 0, // Set to positive number for auto interval and interval time
            slidespeed: 300, // Speed of slide animation
            fadespeed: 300, // Speed of fade animation
            items: 3, // Items show
            padding: 0, // Padding between items
            showPagination: true, // Shows pagination links
            vertical: false
        };

        this.each(function () {
            var obj = $(this);
            var o = $.extend(defaults, options);
            var i = o.items;
            var m = 0;
            var t = 1;
            var s = $(o.slides, obj).children().size();
            var w = $(o.slides, obj).children().outerWidth() + o.padding;
            var h = $(o.slides, obj).children().outerHeight() + o.padding;
            var c = Math.ceil($(o.slides, obj).children().size() / i);
            var pd = o.padding / 2;
            var p = 0;
            var u = false;
            var n = 0;
            var pt = 0;
            var os = i * c - s;
            var params = {};

            if (o.vertical === true) { w = h; }

            if (o.showPagination) {
                var buttons = s / i;
                $(obj).append('<ul class="pagination">');
                $(o.slides, obj).children().each(function () {
                    if (n < buttons) {
                        $(o.pagination, obj).append('<li><a rel="' + (n + 1) + '" href="#" >' + (n + 1) + '</a></li>');
                        n = n + 1;
                    } else {
                        n = 0;
                        return false;
                    }
                    $(o.pagination + ' li a:eq(0)', obj).parent().addClass('active');
                });
            }

            if (o.vertical === true) {
                $(o.container, obj).css({ height: (w * i) });
                $(o.slides, obj).css({ height: (s * w) });
            } else {
                $(o.container, obj).css({ width: (w * i) });
                $(o.slides, obj).css({ width: (s * w) });
            }

            $(o.slides, obj).children().each(function () {
                if (o.vertical === true) {
                    $(this).css({ position: 'absolute', top: p + pd, display: 'block' });
                } else {
                    $(this).css({ position: 'absolute', left: p + pd, display: 'block' });
                }
                p = p + w;
            });

            $(o.slides, obj).children().each(function () {
                pt = pt + 1;
                if (pt < i + 1) {
                    params[o.vertical ? 'top' : 'left'] = (-w * pt) + pd - (w * os);
                    $(o.slides, obj).children(':eq(' + (s - pt) + ')').css(params);
                }
                if (pt === i + 2) {
                    pt = 0;
                    return false;
                }
            });

            $('.next', obj).click(function () {
                if (u === false) {
                    animate('next', true);
                    if (o.autoStart) { clearInterval(sliderIntervalID); }
                }
                return false;
            });

            $('.previous', obj).click(function () {
                if (u === false) {
                    animate('prev', true);
                    if (o.autoStart) { clearInterval(sliderIntervalID); }
                } return false;
            });

            $(o.pagination + ' li a', obj).click(function () {
                if ($(this).parent().hasClass('active')) { return false; }
                else {
                    t = $(this).attr('rel');
                    $(o.pagination + ' li a', obj).parent().siblings().removeClass('active');
                    $(this).parent().addClass('active');
                    animate('fade', t);
                    if (o.autoStart) { clearInterval(sliderIntervalID); }
                } return false;
            });

            if (o.autoStart) {
                sliderIntervalID = setInterval(function () {
                    if (u === false) { animate('next', true); }
                }, o.autoStart);
            }

            function current(t) {
                if (t === c + 1) { t = 1; }
                if (t === 0) { t = c; }
                $(o.pagination + ' li a', obj).parent().siblings().removeClass('active');
                $(o.pagination + ' li a[rel="' + (t) + '"]', obj).parent().addClass('active');
            }

            function animate(dir, clicked) {
                u = true;
                switch (dir) {
                    case 'next':
                        t = t + 1;
                        m = (-(t * w - w) * i);
                        current(t);
                        params[o.vertical ? 'top' : 'left'] = m;
                        $(o.slides, obj).animate(params, o.slidespeed, function () {
                            if (t === c + 1) {
                                t = 1;
                                params[o.vertical ? 'top' : 'left'] = 0;
                                $(o.slides, obj).css(params, function () {
                                    $(o.slides, obj).animate(params);
                                });
                                $(o.slides, obj).children().each(function () {
                                    if (pt < i) {
                                        params[o.vertical ? 'top' : 'left'] = (w * pt) + pd;
                                        $(o.slides, obj).children(':eq(' + pt + ')').css(params);
                                        params[o.vertical ? 'top' : 'left'] = -(w * (pt + os + 1) - pd);
                                        $(o.slides, obj).children(':eq(' + (s - (pt + 1)) + ')').css(params);
                                    } else {
                                        pt = 0;
                                        return false;
                                    }
                                    pt = pt + 1;
                                });
                            }
                            if (t === c) {
                                $(o.slides, obj).children().each(function () {
                                    if (pt < i) {
                                        params[o.vertical ? 'top' : 'left'] = w * (s + pt + os) + pd;
                                        $(o.slides, obj).children(':eq(' + (pt) + ')').css(params);
                                    } else {
                                        pt = 0;
                                        return false;
                                    }
                                    pt = pt + 1;
                                });
                            }
                            if (t === 2) {
                                $(o.slides, obj).children().each(function () {
                                    pt = pt + 1;
                                    if (pt < i + 1) {
                                        params[o.vertical ? 'top' : 'left'] = ((w * s) + pd) - (w * pt);
                                        $(o.slides, obj).children(':eq(' + (s - pt) + ')').css(params);
                                    } else {
                                        pt = 0;
                                        return false;
                                    }
                                });
                            }
                            u = false;
                        });
                        break;
                    case 'prev':
                        t = t - 1;
                        m = (-(t * w - w) * i);
                        current(t);
                        params[o.vertical ? 'top' : 'left'] = m;
                        $(o.slides, obj).animate(params, o.slidespeed, function () {
                            if (t === 0) {
                                t = c;
                                params[o.vertical ? 'top' : 'left'] = -w * (s - i) - (w * os);
                                $(o.slides, obj).css(params);
                                $(o.slides, obj).children().each(function () {
                                    if (pt < i) {
                                        params[o.vertical ? 'top' : 'left'] = w * (s + pt + os) + pd;
                                        $(o.slides, obj).children(':eq(' + pt + ')').css(params);
                                        params[o.vertical ? 'top' : 'left'] = (s * w) + pd - (pt * w) - w;
                                        $(o.slides, obj).children(':eq(' + ((s - 1) - pt) + ')').css(params);
                                    } else {
                                        pt = 0;
                                        return false;
                                    }
                                    pt = pt + 1;
                                });
                            }
                            if (t === 2) {
                                $(o.slides, obj).children().each(function () {
                                    if (pt < i) {
                                        params[o.vertical ? 'top' : 'left'] = (w * pt) + pd;
                                        $(o.slides, obj).children(':eq(' + pt + ')').css(params);
                                    } else {
                                        pt = 0;
                                        return false;
                                    }
                                    pt = pt + 1;
                                });
                            }
                            if (t === 1) {
                                $(o.slides, obj).children().each(function () {
                                    if (pt < i) {
                                        params[o.vertical ? 'top' : 'left'] = -(w * pt) - w + pd - (w * os);
                                        $(o.slides, obj).children(':eq(' + ((s - 1) - pt) + ')').css(params);
                                    } else {
                                        pt = 0;
                                        return false;
                                    }
                                    pt = pt + 1;
                                });
                            }

                            u = false;
                        });
                        break;
                    case 'fade':
                        t = [t] * 1;
                        m = (-(t * w - w) * i);
                        current(t);
                        $(o.slides, obj).children().fadeOut(o.fadespeed, function () {
                            params[o.vertical ? 'top' : 'left'] = m;
                            $(o.slides, obj).css(params);
                            $(o.slides, obj).children().each(function () {
                                if (pt < i) {
                                    params[o.vertical ? 'top' : 'left'] = (pt * w) + pd;
                                    $(o.slides, obj).children(':eq(' + pt + ')').css(params);
                                    params[o.vertical ? 'top' : 'left'] = w * (s - pt) - w + pd;
                                    $(o.slides, obj).children(':eq(' + ((s - 1) - pt) + ')').css(params);
                                } else {
                                    pt = 0;
                                    return false;
                                }
                                pt = pt + 1;
                            });

                            if (t === c) {
                                $(o.slides, obj).children().each(function () {
                                    if (pt < i) {
                                        params[o.vertical ? 'top' : 'left'] = w * (s + pt + os) + pd;
                                        $(o.slides, obj).children(':eq(' + (pt) + ')').css(params);
                                    } else {
                                        pt = 0;
                                        return false;
                                    }
                                    pt = pt + 1;
                                });
                            }
                            if (t === 1) {
                                $(o.slides, obj).children().each(function () {
                                    pt = pt + 1;
                                    if (pt < i + 1) {
                                        params[o.vertical ? 'top' : 'left'] = -(w * pt) + pd - (w * os);
                                        $(o.slides, obj).children(':eq(' + (s - pt) + ')').css(params);
                                    } else {
                                        pt = 0;
                                        return false;
                                    }
                                });
                            }
                            $(o.slides, obj).children().fadeIn(o.fadespeed);
                            u = false;
                        });
                        break;
                    default:
                        break;
                }
            }
        });
    };
})(jQuery);