/* - ++resource++easySlider.js - */

(function($) {

	$.fn.easySlider = function(options){

		var defaults = {			
			prevId: 		'prevBtn',
			prevText: 		'&nbsp',
			nextId: 		'nextBtn',	
			nextText: 		'&nbsp',
			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,
			goToButtonId:   'goToButton',
			goToRotateAmount:8,
			effect: 'Slide',
			navigation_type: 'Navigation Buttons'
		}; 
		
		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');
			
			
			//Navigation...
			if(options.navigation_type != "No Buttons"){
				var html = options.controlsBefore;
				if(options.navigation_type == "Navigation Buttons"){
				    html += "<div id='easySlider-goToButtons'>";
					html += ' <span id="leftb"><a class="leftright" href=\"javascript:void(0);\">'+ options.prevText +'</a></span>';
				    for(var i=0; i < ts+1; i++){ 
				        html += "<a id=\"" + options.goToButtonId + i + "\" href=\"javascript:void(0);\">" + (i+1) + "</a> ";
				    }
					html += ' <span id="rightb"><a class="leftright" href=\"javascript:void(0);\">'+ options.nextText +'</a></span>';
				    html += "</div>";
				}
				if(options.firstShow) html += '<span id="'+ options.firstId +'"><a href=\"javascript:void(0);\">'+ options.firstText +'</a></span>';
				if(options.navigation_type == "Big Arrows"){
				    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>';
		        }else if(options.navigation_type == "Small Arrows"){
		            html += "<div id='smallButtons'>";
				    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>';
		            html += "</div>";
		        }
				if(options.lastShow) html += ' <span id="'+ options.lastId +'"><a href=\"javascript:void(0);\">'+ options.lastText +'</a></span>';
				html += options.controlsAfter;			
				$(obj).after(html);										
			};
	        //end nav
	        
			$("a","#"+options.nextId).click(function(){		
				animate("next",true);
			});
			$("a","#"+options.prevId).click(function(){		
				animate("prev",true);				
			});	
			$("span#leftb a").click(function(){		
				animate("prev",true);				
			});
			$("span#rightb a").click(function(){		
				animate("next",true);				
			});
			$("a","#"+options.firstId).click(function(){		
				animate("first",true);
			});				
			$("a","#"+options.lastId).click(function(){		
				animate("last",true);				
			});	
			$("div#easySlider-goToButtons a:not(.leftright)").click(function(){
			    animate(parseInt($(this).attr('id').substring(options.goToButtonId.length)), true);
			});
			
			if(options.navigation_type == "Navigation Buttons") $("#" + options.goToButtonId + "0").addClass('active');
			
			function update_goToButtons(btns){
			    if(btns.size() > options.goToRotateAmount){
			        var min = Math.max(t - Math.floor(options.goToRotateAmount/2), 0);
			        var max = Math.min(t + Math.floor(options.goToRotateAmount/2), btns.size());
			        var diff = max - min;
			        if(diff != options.goToRotateAmount) min = Math.max(min - (options.goToRotateAmount - diff), 0);
			        diff = max - min;
			        if(diff != options.goToRotateAmount) max = Math.min(max + (options.goToRotateAmount - diff), btns.size());
			        for(var i = 0; i < min; i++) $("#" + options.goToButtonId + i).hide();
			        for(var i = min; i < max; i++) $("#" + options.goToButtonId + i).show();
			        for(var i = max; i < btns.size(); i++) $("#" + options.goToButtonId + i).hide();
			    }
			}
			
			update_goToButtons($("div#easySlider-goToButtons a:not(.leftright)"));
			
			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:
					    if(typeof(dir) == "number") t = dir;
						break; 
				};	
				
				if(options.navigation_type == "Navigation Buttons"){
				    var btns = $("div#easySlider-goToButtons a:not(.leftright)");
				    btns.removeClass("active");
				    $("#" + options.goToButtonId + t).addClass('active');
				    update_goToButtons(btns);
				}
				
				var diff = Math.abs(ot-t);
				//var speed = diff*options.speed; //don't like this... too slow for lots of slides
				var position = (t*w*-1);
				if(options.vertical){
				    position = (t*h*-1);
				}
				
				if(options.effect == "Slide"){
				    var speed = (diff*options.speed)/diff;
    				if(!options.vertical) {
    					$("ul",obj).animate(
    						{ marginLeft: position }, 
    						speed
    					);				
    				} else {
    					p = (t*h*-1);
    					$("ul",obj).animate(
    						{ marginTop: position }, 
    						speed
    					);					
    				};
				}else if(options.effect == "Fade"){
				    var margin = "marginLeft";
				    if(options.vertical){ margin = "marginTop"; }

			        $("ul", obj).fadeOut(Math.ceil(options.speed/2), function(){
			            $(this).css(margin, position).fadeIn(Math.ceil(options.speed/2));
                    });
				}
				
				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);