/*
* 	Easy Slider 1.8 - jQuery plugin
*	written by Alen Grakalic (modified by Kyle Florence - kyle.florence@gmail.com)
*	http://cssglobe.com/post/4004/easy-slider-15-the-easiest-jquery-plugin-for-sliding
*
*	Copyright (c) 2009 Alen Grakalic (http://cssglobe.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 $("#slider").easySlider();
*
* 	<div id="slider">
*		<ul>
*			<li><img src="images/01.jpg" alt="" /></li>
*			<li><img src="images/02.jpg" alt="" /></li>
*			<li><img src="images/03.jpg" alt="" /></li>
*			<li><img src="images/04.jpg" alt="" /></li>
*			<li><img src="images/05.jpg" alt="" /></li>
*		</ul>
*	</div>
*
*/

(function ($) {
    $.fn.easySlider = function (options) {
        // default configuration properties
        var defaults = {
            prevId: 'prevBtn',
            prevText: 'Previous',
            nextId: 'nextBtn',
            nextText: 'Next',
            controlsShow: true,
            controlsBefore: '',
            controlsAfter: '',
            controlsFade: true,
            insertAfter: true,
            firstId: 'firstBtn',
            firstText: 'First',
            firstShow: false,
            lastId: 'lastBtn',
            lastText: 'Last',
            lastShow: false,
            vertical: false,
            speed: 800,
            ease: 'swing',
            auto: false,
            pause: 2000,
            continuous: false,
            prevNext: true,
            numeric: false,
            numericId: 'controls'
        };

        var options = $.extend(defaults, options);

        this.each(function () {
            var obj = $(this);

            // Fix for nested list items
            var ul = obj.children("ul");
            var li = ul.children("li");

            var s = li.length;
            var w = obj.width();
            var h = obj.height();

            var t = 0;
            var ts = s - 1;
            var clickable = true;

            // Set obj overflow to hidden
            obj.css("overflow", "hidden");

            // Set width/height of list items based on width/height of obj
            li.each(function () {
                if (options.vertical) $(this).height(h);
                else $(this).width(w);
            });

            // Float items to the left
            li.css('float', 'left');

            // Set width/height of ul
            if (options.vertical) ul.height(s * w);
            else ul.width(s * h);

            // Clone elements for continuous scrolling
            if (options.continuous) {
                if (options.vertical) {
                    ul.prepend(li.filter(":last-child").clone().css("margin-top", "-" + h + "px"));
                    ul.append(li.filter(":nth-child(2)").clone());
                    ul.height((s + 1) * h);
                } else {
                    ul.prepend(li.filter(":last-child").clone().css("margin-left", "-" + w + "px"));
                    ul.append(li.filter(":nth-child(2)").clone());
                    ul.width((s + 1) * w);
                }
            };

            if (options.controlsShow) {
                var html = options.controlsBefore;
                if (options.numeric) {
                    html += '<ol id="' + options.numericId + '"></ol>';
                }
                if (options.firstShow) {
                    html += '<span id="' + options.firstId + '"><a href="#">' + options.firstText + '</a></span>';
                }
                if (options.prevNext) {
                    html += '<span id="' + options.prevId + '"><a href="#">' + options.prevText + '</a></span>';
                    html += '<span id="' + options.nextId + '"><a href="#">' + options.nextText + '</a></span>';
                }
                if (options.lastShow) {
                    html += '<span id="' + options.lastId + '"><a href="#">' + options.lastText + '</a></span>';
                }
                html += options.controlsAfter;

                if (options.insertAfter) $(obj).after(html);
                else $(obj).before(html);
            };

            if (options.numeric) {
                for (var i = 0; i < s; i++) {
                    $(document.createElement("li"))
                        .attr('id', options.numericId + (i + 1))
                        .html('<a rel="' + i + '" href="#"><span>' + (i + 1) + '</span></a>')
                        .appendTo($("#" + options.numericId))
                        .click(function () {
                            animate($("a", $(this)).attr('rel'), true);
                            return false;
                        });
                };
            }

            if (options.prevNext) {
                $("a", "#" + options.nextId).click(function () {
                    animate("next", true); return false;
                });
                $("a", "#" + options.prevId).click(function () {
                    animate("prev", true); return false;
                });
                $("a", "#" + options.firstId).click(function () {
                    animate("first", true); return false;
                });
                $("a", "#" + options.lastId).click(function () {
                    animate("last", true); return false;
                });
            };

            function setCurrent(i) {
                i = parseInt(i) + 1;
                $("li", "#" + options.numericId).removeClass("current");
                $("li#" + options.numericId + i).addClass("current");
            };

            function adjust() {
                if (t > ts) t = 0;
                if (t < 0) t = ts;
                if (!options.vertical) {
                    ul.css("margin-left", (t * w * -1));
                } else {
                    ul.css("margin-top", (t * h * -1));
                }
                clickable = true;
                if (options.numeric) setCurrent(t);
            };

            function animate(dir, clicked) {
                if (clickable) {
                    clickable = false;
                    var ot = t;
                    switch (dir) {
                        case "next":
                            t = (ot >= ts) ? (options.continuous ? t + 1 : ts) : t + 1;
                            break;
                        case "prev":
                            t = (t <= 0) ? (options.continuous ? t - 1 : 0) : t - 1;
                            break;
                        case "first":
                            t = 0;
                            break;
                        case "last":
                            t = ts;
                            break;
                        default:
                            t = parseInt(dir);
                            break;
                    };

                    var diff = Math.abs(ot - t);
                    var speed = diff * options.speed;
                    if (!options.vertical) {
                        p = (t * w * -1);
                        ul.animate(
                            { marginLeft: p },
                            {
                                queue: false,
                                duration: speed,
                                easing: options.ease,
                                complete: adjust
                            }
                        );
                    } else {
                        p = (t * h * -1);
                        ul.animate(
                            { marginTop: p },
                            {
                                queue: false,
                                duration: speed,
                                easing: options.ease,
                                complete: adjust
                            }
                        );
                    };

                    if (!options.continuous && options.controlsFade) {
                        if (t == 0) {
                            $("a", "#" + options.prevId).fadeOut('slow');
                            $("a", "#" + options.firstId).fadeOut('slow');
                        } else if (t == ts) {
                            $("a", "#" + options.nextId).fadeOut('slow');
                            $("a", "#" + options.lastId).fadeOut('slow');
                        } else {
                            $("a", "#" + options.prevId).fadeIn('slow');
                            $("a", "#" + options.firstId).fadeIn('slow');
                            $("a", "#" + options.nextId).fadeIn('slow');
                            $("a", "#" + options.lastId).fadeIn('slow');
                        };
                    };

                    if (clicked) clearTimeout(timeout);
                    if (options.auto && dir == "next" && !clicked) {
                        ;
                        timeout = setTimeout(function () {
                            animate("next", false);
                        }, diff * options.speed + options.pause);
                    };

                };
            };
            // init
            var timeout;
            if (options.auto) {
                ;
                timeout = setTimeout(function () {
                    animate("next", false);
                }, options.pause);
            };

            if (options.numeric) setCurrent(0);

            if (!options.continuous && options.controlsFade) {
                $("a", "#" + options.prevId).hide();
                $("a", "#" + options.firstId).hide();
            };

        });

    };
})(jQuery);