/*
 * 	Easy Slider 1.5 - jQuery plugin
 *	written by Alen Grakalic	
 *	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)
    {
        jQuery.easing.def = 'easeOutQuad';


        // default configuration properties
        var defaults = {
            prevId: 'prevBtn',
            prevText: 'Previous',
            nextId: 'nextBtn',
            nextText: 'Next',
            controlsShow: false,
            controlsBefore: '',
            controlsAfter: '',
            controlsFade: true,
            firstId: 'firstBtn',
            firstText: 'First',
            firstShow: false,
            lastId: 'lastBtn',
            lastText: 'Last',
            lastShow: false,
            vertical: false,
            speed: 1000,
            auto: false,
            pause: 3000,
            continuous: false,
            finishSlideCallback: function () { },
            slideShowEndedCallback: function () { },
            hasEndingCallback: false
        };

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

        this.each(function ()
        {
            var obj = $(this);
            var s = $("li", obj).length;
            var w = $("li", obj).width();
            var h = $("li", obj).height();
            obj.width(w);
            obj.height(h);
            obj.css("overflow", "hidden");
            var ts = s - 1;
            var t = 0;
            $("ul", obj).css('width', s * w);
            if (!options.vertical) $("li", obj).css('float', 'left');

            if (options.controlsShow)
            {
                var html = options.controlsBefore;
                if (options.firstShow) html += '<span id="' + options.firstId + '"><a href=\"javascript:void(0);\">' + options.firstText + '</a></span>';
                html += ' <span id="' + options.prevId + '"><a href=\"javascript:void(0);\">' + options.prevText + '</a></span>';
                html += ' <span id="' + options.nextId + '"><a href=\"javascript:void(0);\">' + options.nextText + '</a></span>';
                if (options.lastShow) html += ' <span id="' + options.lastId + '"><a href=\"javascript:void(0);\">' + options.lastText + '</a></span>';
                html += options.controlsAfter;
                $(obj).after(html);
            };

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

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

                    var diff = Math.abs(ot - t);
                    var speed = diff * options.speed;
                    if (!options.vertical)
                    {
                        if (t == 0)
                            speed = 0;
                        p = (t * w * -1);
                        $("ul", obj).animate(
						{ marginLeft: p },
						speed,
                        options.finishSlideCallback
					);
                    } else
                    {
                        p = (t * h * -1);
                        $("ul", obj).animate(
						{ marginTop: p },
						speed,
                        options.finishSlideCallback
					);
                    };

                    if (!options.continuous && options.controlsFade)
                    {
                        if (t == ts)
                        {
                            $("a", "#" + options.nextId).hide();
                            $("a", "#" + options.lastId).hide();
                            if (options.hasEndingCallback)
                            {
                                ended = true;
                            }
                        } else
                        {
                            $("a", "#" + options.nextId).show();
                            $("a", "#" + options.lastId).show();
                        };
                        if (t == 0)
                        {
                            $("a", "#" + options.prevId).hide();
                            $("a", "#" + options.firstId).hide();
                        } else
                        {
                            $("a", "#" + options.prevId).show();
                            $("a", "#" + options.firstId).show();
                        };
                    };

                    if (clicked) clearTimeout(timeout);
                    if (options.auto && dir == "next" && !clicked)
                    {
                        timers.push(window.setTimeout(
                            function ()
                            {
                                animate("next", false);
                            },
                            diff * options.speed + options.pause));
                        timeout = timers[timers.length - 1];
                    };
                }
                else
                {
                    options.auto = false;
                    clearAllTimers();
                    if (options.hasEndingCallback && ended)
                    {
                        options.slideShowEndedCallback.call(this, '');
                    }
                }

            };
            // init
            var timeout;
            if (options.auto)
            {
                timers.push(window.setTimeout(function ()
                {
                    animate("next", false);
                }, options.pause));
                timeout = timers[timers.length - 1];
            };

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

        });

    };

})(jQuery);