/*
        * 	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) {

        // default configuration properties
        var defaults = {
            prevId: 'prevBtn',
            prevText: 'Previous',
            nextId: 'nextBtn',
            nextText: 'Next',
            controlsShow: true,
            controlsBefore: '',
            controlsAfter: '',
            controlsFade: true,
            firstId: 'firstBtn',
            firstText: 'First',
            firstShow: false,
            lastId: 'lastBtn',
            lastText: 'Last',
            lastShow: false,
            vertical: false,
            speed: 200,
            auto: false,
            pause: 2000,
            continuous: false,
            isSeamlessly: true, //是否无缝滚动
            sliderCount: 1
        };

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

        this.each(function() {
            var obj = $(this);
            var s = $("li", obj).length;
            var w = $("li", obj).width();
            var h = $("li", obj).height();

            obj.css("overflow", "hidden");
            var ts = s - 1;
            var t = 0;

            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() {
                animate1("next", true);
            });
            $("a", "#" + options.prevId).click(function() {
                animate1("prev", true);
            });
            $("a", "#" + options.firstId).click(function() {
                animate1("first", true);
            });
            $("a", "#" + options.lastId).click(function() {
                animate1("last", true);
            });

            function animate1(dir, clicked) {
                var ot = t;
                switch (dir) {
                    case "next":
                        t = (ot >= ts) ? (options.continuous ? 0 : ts) : t + options.sliderCount;
                        break;
                    case "prev":
                        t = (t <= 0) ? (options.continuous ? ts : 0) : t - options.sliderCount;
                        break;
                    case "first":
                        t = 0;
                        break;
                    case "last":
                        t = ts;
                        break;
                    default:
                        break;
                };

                var diff = Math.abs(ot - t);

                var speed = diff * options.speed;

                speed = options.speed;

                if (!options.isSeamlessly) {

                    if (!options.vertical) {

                        p = (t * w * -1);

                        $("ul", obj).animate({ marginLeft: p }, speed);
                    } else {
                        p = (t * h * -1);

                        $("ul", obj).animate({ marginTop: p }, speed);
                    }
                }
                else {

                    if (!options.vertical) {
                        p = w * -1; //(t * w * -1);
                        $("li:lt(" + options.sliderCount + ")", obj).clone().appendTo($("ul", obj)).fadeIn('fast');
                        $("li:lt(" + options.sliderCount + ")", obj).animate({ marginLeft: p }, speed);
                        setTimeout(function() { $("li:lt(" + options.sliderCount + ")", obj).remove(); }, speed);
                    } else {
                        p = h * -1; // (t * h * -1);
                        $("li:lt(" + options.sliderCount + ")", obj).clone().appendTo($("ul", obj)).fadeIn('fast');
                        $("li:lt(" + options.sliderCount + ")", obj).animate({ marginTop: p }, speed);
                        setTimeout(function() { $("li:lt(" + options.sliderCount + ")", obj).remove() }, speed);
                    }
                }
                if (!options.continuous && options.controlsFade) {
                    if (t >= ts) {
                        $("a", "#" + options.nextId).hide();
                        $("a", "#" + options.lastId).hide();
                    } 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) {
                    ;
                    timeout = setTimeout(function() {
                        animate1("next", false);
                    }, diff * options.speed + options.pause);
                };

            };
            // init
            var timeout;
            if (options.auto) {
                ;
                timeout = setTimeout(function() {
                    animate1("next", false);
                }, options.pause);
            };
            $(this).mouseover(function() { clearTimeout(timeout) });
            $(this).mouseout(function() { timeout = setTimeout(function() { animate1("next", false); }, options.pause); });


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

        });

    };

})(jQuery);