/*
 *         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:                         800,
                        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(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){
                                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){
                                                $("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(){
                                                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();
                        };

                });

        };

})(jQuery);