/*
 * 	exFixed 1.3.1 - jQuery plugin
 *	written by Cyokodog	
 *
 *	Copyright (c) 2010 Cyokodog (http://d.hatena.ne.jp/cyokodog/)
 *	Dual licensed under the MIT (MIT-LICENSE.txt)
 *	and GPL (GPL-LICENSE.txt) licenses.
 *
 *	Built for jQuery library
 *	http://jquery.com
 *
 */
(function($){

	var API = function(api){
		var api = $(api),api0 = api[0];
		for(var name in api0)
			(function(name){
				if($.isFunction( api0[name] ))
					api[ name ] = (/^get[^a-z]/.test(name)) ?
						function(){
							return api0[name].apply(api0,arguments);
						} : 
						function(){
							var arg = arguments;
							api.each(function(idx){
								var apix = api[idx];
								apix[name].apply(apix,arg);
							})
							return api;
						}
			})(name);
		return api;
	}

	var scrollEvent = function( target , config ){
		var o = this;
		if( typeof config == 'function') config = {
			callback : config
		}
		var c = o.config = $.extend({},scrollEvent.defaults,config,{
			target : target
		});
		c.status = 0;
		c.scroll = o.getPos();
		c.target.scroll(function( evt ){
			if (o.isMove()) {
				c.status = (c.status == 0 ? 1 : (c.status == 1 ? 2 : c.status) );
				c.callback( evt , c );
			}
			if(c.tm) clearTimeout(c.tm);
			c.tm = setTimeout(function(){
				o.isMove();
				c.status = 0;
				c.callback( evt , c );
			},c.delay);
		});
	}
	$.extend(scrollEvent.prototype,{
		isMove : function(){
			var o = this, c = o.config;
			var pos = o.getPos();
			var scrollY = (pos.top != c.scroll.top);
			var scrollX = (pos.left != c.scroll.left);
			if(scrollY || scrollX){
				c.scrollY = scrollY;
				c.scrollX = scrollX;
				c.prevScroll = c.scroll;
				c.scroll = pos;
				return true;
			}
			return false;
		},
		getPos : function(){
			var o = this, c = o.config;
			return {
				top : c.target.scrollTop(),
				left : c.target.scrollLeft()
			}		
		}
	});
	scrollEvent.defaults = {
		delay : 100
	}

	$.ex = $.ex || {};

	$.ex.fixed = function(idx , targets , option){
		var o = this,
		c = o.config = $.extend({} , $.ex.fixed.defaults , option);
		c.targets = targets;
		c.target = c.targets.eq(idx);
		c.index = idx;

		c = $.extend(c,{
			_hidePos : false,
			logicSize : {},
			rowSize : {},
			currentStyle : '',
			style : '',
			window : $(window),
			oldBrowser : $.browser.msie && ($.browser.version < 7.0 || !$.boxModel)
		});
		c.dynamicMode = c.baseNode || !c.fixedX || !c.fixedY;

		if (c.dynamicFixed || c.dynamicMode || c.oldBrowser){
			$('body').append(c.target);
		}

		if (c.baseNode) c.baseNode = $(c.baseNode);
		var size = o._cleanSize(c);

		if (c.dynamicFixed) {
			o._eachSizeSet(function(idx , at1 , cm1){
				c.dynamicFixed = c.dynamicFixed && 
					(size[at1.pos1] != undefined || size[at1.pos2] != undefined);
			});
		}

		if (c.dynamicMode) c.dynamicFixed = true;
		if (c.oldBrowser) o._padPos( size , o._cleanSize(c.target[0].currentStyle) );
		else if (!c.dynamicFixed) {
			c.target.css('position','fixed').css(size);
			return;
		}
//		c.container = $.boxModel && !$.browser.opera ? $('html') : $('body');
		c.container = $.boxModel ? $('html') : $('body');
		c.container.height(); //for IE Bug

		c.target.css('position',c.oldBrowser ? 'absolute' : 'fixed');
//		if (c.oldBrowser && !/hidden|scroll/i.test(c.target.css('overflow'))) {
		if (!/hidden|scroll/i.test(c.target.css('overflow'))) {
			c.target.css('overflow','hidden');
		}
		o._smoothPatch();

		o._fixed(size);

		c.window.resize( function(){
			if (c.oldBrowser || c.baseNode) {
				o._fixed();
			}
		});

		if (!(c.fixedX && c.fixedY)) {
			if (c.oldBrowser) {
				var tm;
				c.window.scroll(function(){
					if(tm) clearTimeout(tm);
					tm = setTimeout(function(){
						o._fixed();
					},0);
				});
			}
			else{
				new scrollEvent(c.window,function( evt , pa ){
					if ((pa.scrollX && !c.fixedX) || (pa.scrollY && !c.fixedY)) {
						if (pa.status == 1) {
							o._fixed(c.logicSize,{
								unfixed:true
							});
						}
						else
						if (pa.status == 0) {
							o._fixed();
						}
					}
				})
			}
		}
	}
	$.extend($.ex.fixed.prototype, {
		_attn :[
			{size:'height',pos1:'top',pos2:'bottom'},
			{size:'width',pos1:'left',pos2:'right'}
		],
		_camel :[
			{size:'Height',pos1:'Top',pos2:'Bottom'},
			{size:'Width',pos1:'Left',pos2:'Right'}
		],
		_smoothPatch : function(){
			var o = this , c = o.config;
			if( !c.oldBrowser ) return o;
			$.ex.fixed.config.smoothPatched = true;
			if(c.container.css('background-image') == 'none'){
				c.container.css({'background-image':'url(null)'});
			}
			c.container.css({'background-attachment':'fixed'});
			return o;
		},
		_eachSize : function( f ){
			var o = this , c = o.config;
			for (var i = 0; i < o._attn.length; i++) {
				var attn = o._attn[i];
				for (var j in attn) {
					var name = attn[j];
					f({
						idx : i,
						name : name,
						camel : name.slice(0,1).toUpperCase() + name.slice(1)
					});
				}
			}
		},
		_eachSizeSet : function( f ){
			var o = this , c = o.config;
			for (var i = 0; i < o._attn.length; i++) {
				f( i , o._attn[i] , o._camel[i] , o._attn[1-i] , o._camel[1-i]);
			}
		},
		_parseSize : function( val , xFlg ){
			var o = this , c = o.config;
			if( val == 'auto' ) return undefined;
			if((val + '').indexOf('%') < 0) return parseInt(val) || 0;
			var cSize = c.container.attr(xFlg ? 'clientWidth' : 'clientHeight');
			return Math.round(cSize * parseInt(val) / 100);
		},
		_parseIntSize : function( val , xFlg ){
			var o = this , c = o.config;
			return parseInt( o._parseSize( val , xFlg ) ) || 0;
		},
		_cleanSize : function(size){
			var o = this , c = o.config;
			var ret = {};
			o._eachSize( function( pa ){
				if(/undefined|auto/i.test(size[pa.name])){
					try{
						delete size[pa.name];
					}
					catch(e){}
				}
				else{
					ret[pa.name] = size[pa.name];
				}
			});
			return ret;	
		},
		_padPos : function( size , pad ){
			var o = this , c = o.config;
			var pos;
			o._eachSizeSet(function(idx , at1 , cm1){
				if (size[at1.pos1] == undefined && size[at1.pos2] == undefined) {
					if( (pos = pad[at1.pos1]) != undefined ) size[at1.pos1] = pos;
					else if( (pos = pad[at1.pos2]) != undefined ) size[at1.pos2] = pos;
					else size[at1.pos1] = 0;
				}
				if(size[at1.size] == undefined){
					if((size[at1.size] = pad[at1.size]) == undefined){
						size[at1.size] = c.target[at1.size]();
					}
				}
			});
			return size;
		},
		_calcRowSize : function( size , opt ){
			var o = this , c = o.config;
			var opt = $.extend({
				abs : false,
				base : c.baseNode,
				unfixed : false
			},opt);
			var ret = {};
			o._eachSize( function( pa ){
				var val = size[pa.name];
				if(!(/undefined/i.test( val ))){
					ret[pa.name] = o._parseIntSize(val,/width|left|right/i.test(pa.name));
					if (opt.abs && /top|left/i.test(pa.name)){
						ret[pa.name] += c.window['scroll'+pa.camel]();
					}
				}
			});
			if(opt.base){
				var basePos = c.baseNode.offset();
				o._eachSizeSet( function(idx , pa , cm ){
					basePos[pa.pos2] = c.container.attr('client'+cm.size)
						- (basePos[pa.pos1] + c.baseNode['outer'+cm.size]());
				});
				o._eachSize( function( pa ){
					if(!(/height|width/i.test(pa.name)) && ret[pa.name] == undefined
						&& ((!pa.idx && c.baseY) || (pa.idx && c.baseX)) ){
						var name = pa.name == 'top' ? 'bottom' : pa.name == 'bottom' ? 'top' : pa.name == 'left' ? 'right' : 'left';
						ret[name] += basePos[name];
					}
				});
			}
			var fg = opt.unfixed && !c.fixedX ? -1 : 1;
			if(fg == -1|| (!opt.unfixed && !c.fixedY)){
				if(ret.top != undefined)ret.top -= (c.window.scrollTop()*fg);
				if(ret.bottom != undefined)ret.bottom += (c.window.scrollTop()*fg);
			}
			var fg = !opt.unfixed && !c.fixedX ? -1 : 1;
			if(fg == -1|| (opt.unfixed && !c.fixedY) ){
				if(ret.left != undefined )ret.left += (c.window.scrollLeft()*fg);
				if(ret.right != undefined )ret.right -= (c.window.scrollLeft()*fg);
			}
			return ret;
		},
		_fixed : function( size , opt ){
			var o = this , c = o.config;
			var opt = $.extend({
				unfixed : false
			},opt);
			if(size) c.logicSize = o._padPos(o._cleanSize(size),c.logicSize);
			if(!c.oldBrowser){
				c.target.css( 
					$.extend(
						c.baseNode || !(c.fixedX && c.fixedY) ? o._calcRowSize( c.logicSize , opt ) : c.logicSize,
						{position:opt.unfixed?'absolute':'fixed'}
					)
				);
			}
			else{
				var rowSize = o._calcRowSize( c.logicSize );
				var hide = false;
				if (c.target.is(':hidden')) {
					if (!c._hidePos) hide = true;
					c.target.show();
				}
				c._hidePos = false;
				o._eachSizeSet( function( idx , pa , cm ){
					c.target.css( pa.size , rowSize[ pa.size ] );
					var pos1 = rowSize[ pa.pos1 ];
					if( pos1 == undefined ){ //right,bottom based
						pos1 = c.container.attr( 'client' + cm.size ) - rowSize[ pa.pos2 ] - c.target[ 'outer' + cm.size ]();
					}
					var over = (pos1 + c.target['outer'+cm.size]()) - c.container.attr('client'+cm.size);
					if (over > 0) {
						over = c.target[pa.size]() - over;
						if (over > 0) {
							c.target[pa.size](over);
						}
						else {
							if (!hide) c._hidePos = true;
						}
					}
					if(!hide && !c._hidePos){
						c.target[0].style.setExpression( pa.pos1 ,
							pos1 +
							(	(!idx && !c.fixedY) || (idx && !c.fixedX) ? 
								c.window['scroll'+cm.pos1]() : 
								'+eval(document.body.scroll'+cm.pos1+'||document.documentElement.scroll'+cm.pos1+')'
							)
						);
					}
				});
				if(hide || c._hidePos) {
					c.target.hide();
				}
			}
		},
		getTarget : function(){
			return this.config.target;
		},
		fixedOpen : function( f ){
			var o = this , c = o.config;
			if (!c.dynamicFixed) return;
			c.target.css(o.getFixedSize(c.logicSize));
			if (c.oldBrowser) {
				c.target[0].style.removeExpression('top');
				c.target[0].style.removeExpression('left');
			}
			if( f ) setTimeout(function(){ // for window.scrollTop()
				if (c.oldBrowser) {
					c.target.css({top:'auto',left:'auto'});
					c.target.css(o._calcRowSize(c.logicSize , {
						abs : true
					}));
				}
				f();
			},100);
			return o;
		},
		fixedClose : function( size ){
			var o = this , c = o.config;
			if (!c.dynamicFixed) return;
			o._fixed( size );
			return o;
		},
		getFixedSize : function( size ){
			var o = this , c = o.config;
			return o._calcRowSize(o._padPos(size,c.logicSize),{
				abs : c.oldBrowser
			});
		},
		resize : function( size ){
			var o = this , c = o.config;
			o.fixedOpen(function(){
				o.fixedClose( size );
			})	
			return o;
		}
	});
	$.ex.fixed.config = {
		smoothPatched : false
	};
	$.ex.fixed.defaults = {
	//	top : ,
	//	right : ,
	//	bottom : ,
	//	left : ,
	//	width : ,
	//	height : ,
		api : false,
		dynamicFixed : false,		
		baseNode : '',
		baseX : true,
		baseY : true,
		fixedX : true,
		fixedY : true
	}
	$.fn.exFixed = function(option){
		var targets = this,api = [];
		targets.each(function(idx) {
			var target = targets.eq(idx);
			var obj = target.data('ex-fixed') || new $.ex.fixed( idx , targets , option);
			api.push(obj);
			target.data('ex-fixed',obj);
		});
		return option && option.api ? API(api) : targets;
	}
})(jQuery);