/*
 * 	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: 		'btn_left',
			prevText: 		'Previous',
			nextId: 		'btn_right',	
			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
		}; 
		
		options = $.extend(defaults, options); 
		opt_sub = options;

		this.each(function() {  
			obj = $(this); 				
			s = $("li", obj).length;
			w = $("li", obj).width(); 
			h = $("li", obj).height(); 
			obj.width(w); 
			obj.height(h); 
			obj.css("overflow","hidden");
			ts = s-1;
			t = 0;
			$("ul", obj).css('width',s*w);			
			if(!options.vertical) $("li", obj).css('float','left');
			
			if(options.controlsShow && !init_s){
				//初期化フラグ消去
				init_s = true;
				var html = options.controlsBefore;
				if(options.firstShow) html += '<span id="'+ options.firstId +'"><a href=\"javascript:animate(\'first\',true);\">'+ options.firstText +'</a></span>';
				html += ' <span id="'+ options.prevId +'"><a href=\"javascript:animate(\'prev\',true);\">'+ options.prevText +'</a></span>';
				html += ' <span id="'+ options.nextId +'"><a href=\"javascript:animate(\'next\',true);\">'+ options.nextText +'</a></span>';
				if(options.lastShow) html += ' <span id="'+ options.lastId +'"><a href=\"javascript:animate(\'last\',true);\">'+ options.lastText +'</a></span>';
				html += options.controlsAfter;						
				$(obj).after(html);
								
			};
						
			// init
			slide_timeout = 0;
			if(options.auto){;
				slide_timeout = setTimeout(function(){
					animate("next",false);
				},options.pause);
			};		
		
			if(!options.continuous && options.controlsFade){					
				$("a","#"+options.prevId).hide();
				$("a","#"+options.firstId).hide();				
				if(ts>0){
					$("a","#"+options.nextId).show();
				}else{
					$("a","#"+options.nextId).hide();
				};
			};				
			
		});
	  
	};

})(jQuery);

function animate(dir,clicked){
	ot = t;	
	switch(dir){
		case "next":
			t = (ot>=ts) ? (opt_sub.continuous ? 0 : ts) : t+1;						
			break; 
		case "prev":
			t = (t<=0) ? (opt_sub.continuous ? ts : 0) : t-1;
			break; 
		case "first":
			t = 0;
			break; 
		case "last":
			t = ts;
			break; 
		case "1":
			t = 0;
			break;
		case "2":
			t = 1;
			break;
		case "3":
			t = 2;
			break;
		case "4":
			t = 3;
			break;
		case "5":
			t = 4;
			break;
		default:
			break; 
	};	
	
	diff = Math.abs(ot-t);
	speed = diff*opt_sub.speed;
	if(!opt_sub.vertical) {
		p = (t*w*-1);
		$("ul",obj).animate(
			{ marginLeft: p }, 
			speed
		);				
	} else {
		p = (t*h*-1);
		$("ul",obj).animate(
			{ marginTop: p }, 
			speed
		);					
	};
	
	if(!opt_sub.continuous && opt_sub.controlsFade){
		if(t==ts){
			$("a","#"+opt_sub.nextId).fadeOut("slow");
			$("a","#"+opt_sub.lastId).fadeOut("slow");
		} else {
			$("a","#"+opt_sub.nextId).fadeIn("slow");
			$("a","#"+opt_sub.lastId).fadeIn("slow");
		};
		if(t==0){
			$("a","#"+opt_sub.prevId).fadeOut("slow");
			$("a","#"+opt_sub.firstId).fadeOut("slow");
		} else {
			$("a","#"+opt_sub.prevId).fadeIn("slow");
			$("a","#"+opt_sub.firstId).fadeIn("slow");
		};					
	};
	if(clicked) clearTimeout(slide_timeout);
	if(opt_sub.auto && dir=="next" && !clicked){;
		slide_timeout = setTimeout(function(){
			animate("next",false);
		},diff*opt_sub.speed+opt_sub.pause);
	};
};