/*
 *     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:         '',
            nextId:         'nextBtn',
            nextText:         '',
            controlsShow:    true,
            controlsBefore:    '',
            controlsAfter:    '',
            controlsFade:    true,
            firstId:         'firstBtn',
            firstText:         'First',
            firstShow:        false,
            lastId:         'lastBtn',
            lastText:         'Last',
            lastShow:        false,
            vertical:        false,
            speed:             1000,
            auto:            false,
            pause:            2000,
            continuous:        false
        };

        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.width(3*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 +'_gray"><a>&nbsp;</a></span>';
                html += ' <span id="'+ options.nextId +'_gray"><a>&nbsp;</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){
                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) {
                    p = (t*w*-1);
                    $("ul",obj).animate(
                        { marginLeft: p },
                        speed
                    );
                } else {
                    p = (t*h*-1);
                    $("ul",obj).animate(
                        { marginTop: p },
                        speed
                    );
                };

                if(!options.continuous && options.controlsFade){
                    if(t==ts-2){
                        $("a","#"+options.nextId).hide();
                        $("a","#"+options.lastId).hide();
                        $("a","#"+options.nextId+'_gray').show();
                    } else {
                        $("a","#"+options.nextId).show();
                        $("a","#"+options.lastId).show();
                        $("a","#"+options.nextId+'_gray').hide();
                    };
                    if(t==0){
                        $("a","#"+options.prevId).hide();
                        $("a","#"+options.firstId).hide();
                        $("a","#"+options.prevId+'_gray').show();
                    } else {
                        $("a","#"+options.prevId).show();
                        $("a","#"+options.firstId).show();
                        $("a","#"+options.prevId+'_gray').hide();
                    };
                };

                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.continuous && options.controlsFade){
                $("a","#"+options.prevId).hide();
                $("a","#"+options.firstId).hide();
                $("a","#"+options.prevId+'_gray').show();
                $("a","#"+options.nextId+'_gray').hide();
            };

        });

    };

})(jQuery);