/*
 *      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);