/*
 *    Easy Slider 1.7 - 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:         400,
                        auto:       false,
                        pause:         3000,
                        continuous:    false, 
                        numeric:       false,
                        numericId:     'controls'
                }; 

                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(); 
                        var clickable = true;
                        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.continuous){
                                $("ul", obj).prepend($("ul li:last-child", obj).clone().css("margin-left","-"+ w +"px"));
                                $("ul", obj).append($("ul li:nth-child(2)", obj).clone());
                                $("ul", obj).css('width',(s+1)*w);
                        };          

                        if(!options.vertical) $("li", obj).css('float','left');

                        if(options.controlsShow){
                                var html = options.controlsBefore;            
                                if(options.numeric){
                                        html += '<ol id="'+ options.numericId +'"></ol>';
                                } else {
                                        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);                              
                        };

                        if(options.numeric){                         
                                for(var i=0;i<s;i++){                
                                        $(document.createElement("li"))
                                                .attr('id',options.numericId + (i+1))
                                                .html('<a rel='+ i +' href=\"javascript:void(0);\">'+ (i+1) +'</a>')
                                                .appendTo($("#"+ options.numericId))
                                                .click(function(){                     
                                                        animate($("a",$(this)).attr('rel'),true);
                                                });                                    
                                };                    
                        } else {
                                $("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 setCurrent(i){
                                i = parseInt(i)+1;
                                $("li", "#" + options.numericId).removeClass("current");
                                $("li#" + options.numericId + i).addClass("current");
                        };

                        function adjust(){
                                if(t>ts) t=0;      
                                if(t<0) t=ts;   
                                if(!options.vertical) {
                                        $("ul",obj).css("margin-left",(t*w*-1));
                                } else {
                                        $("ul",obj).css("margin-left",(t*h*-1));
                                }
                                clickable = true;
                                if(options.numeric) setCurrent(t);
                        };

                        function animate(dir,clicked){
                                if (clickable){
                                        clickable = false;
                                        var ot = t;            
                                        switch(dir){
                                                case "next":
                                                        t = (ot>=ts) ? (options.continuous ? t+1 : ts) : t+1;                 
                                                        break; 
                                                case "prev":
                                                        t = (t<=0) ? (options.continuous ? t-1 : 0) : t-1;
                                                        break; 
                                                case "first":
                                                        t = 0;
                                                        break; 
                                                case "last":
                                                        t = ts;
                                                        break; 
                                                default:
                                                        t = dir;
                                                        break; 
                                        };   
                                        var diff = Math.abs(ot-t);
                                        var speed = diff*options.speed;                
                                        if(!options.vertical) {
                                                p = (t*w*-1);
                                                $("ul",obj).animate(
                                                        { marginLeft: p }, 
                                                        { queue:false, duration:speed, complete:adjust }
                                                );          
                                        } else {
                                                p = (t*h*-1);
                                                $("ul",obj).animate(
                                                        { marginTop: p }, 
                                                        { queue:false, duration:speed, complete:adjust }
                                                );             
                                        };

                                        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.numeric) setCurrent(0);

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

                });

        };

})(jQuery);