/*!
 * jquery.scrollto
 * copyright (c) 2007-2012 ariel flesler - aflesler(at)gmail(dot)com | http://flesler.blogspot.com
 * dual licensed under mit and gpl.
 * date: 4/09/2012
 *
 * @projectdescription easy element scrolling using jquery.
 * http://flesler.blogspot.com/2007/10/jqueryscrollto.html
 * @author ariel flesler
 * @version 1.4.3.1
 *
 * @id jquery.scrollto
 * @id jquery.fn.scrollto
 * @param {string, number, domelement, jquery, object} target where to scroll the matched elements.
 *	  the different options for target are:
 *		- a number position (will be applied to all axes).
 *		- a string position ('44', '100px', '+=90', etc ) will be applied to all axes
 *		- a jquery/dom element ( logically, child of the element to scroll )
 *		- a string selector, that will be relative to the element to scroll ( 'li:eq(2)', etc )
 *		- a hash { top:x, left:y }, x and y can be any kind of number/string like above.
 *		- a percentage of the container's dimension/s, for example: 50% to go to the middle.
 *		- the string 'max' for go-to-end. 
 * @param {number, function} duration the overall length of the animation, this argument can be the settings object instead.
 * @param {object,function} settings optional set of settings or the onafter callback.
 *	 @option {string} axis which axis must be scrolled, use 'x', 'y', 'xy' or 'yx'.
 *	 @option {number, function} duration the overall length of the animation.
 *	 @option {string} easing the easing method for the animation.
 *	 @option {boolean} margin if true, the margin of the target element will be deducted from the final position.
 *	 @option {object, number} offset add/deduct from the end position. one number for both axes or { top:x, left:y }.
 *	 @option {object, number} over add/deduct the height/width multiplied by 'over', can be { top:x, left:y } when using both axes.
 *	 @option {boolean} queue if true, and both axis are given, the 2nd axis will only be animated after the first one ends.
 *	 @option {function} onafter function to be called after the scrolling ends. 
 *	 @option {function} onafterfirst if queuing is activated, this function will be called after the first scrolling ends.
 * @return {jquery} returns the same jquery object, for chaining.
 *
 * @desc scroll to a fixed position
 * @example $('div').scrollto( 340 );
 *
 * @desc scroll relatively to the actual position
 * @example $('div').scrollto( '+=340px', { axis:'y' } );
 *
 * @desc scroll using a selector (relative to the scrolled element)
 * @example $('div').scrollto( 'p.paragraph:eq(2)', 500, { easing:'swing', queue:true, axis:'xy' } );
 *
 * @desc scroll to a dom element (same for jquery object)
 * @example var second_child = document.getelementbyid('container').firstchild.nextsibling;
 *			$('#container').scrollto( second_child, { duration:500, axis:'x', onafter:function(){
 *				alert('scrolled!!');																   
 *			}});
 *
 * @desc scroll on both axes, to different values
 * @example $('div').scrollto( { top: 300, left:'+=200' }, { axis:'xy', offset:-20 } );
 */

;(function( $ ){
	
	var $scrollto = $.scrollto = function( target, duration, settings ){
		$(window).scrollto( target, duration, settings );
	};

	$scrollto.defaults = {
		axis:'xy',
		duration: parsefloat($.fn.jquery) >= 1.3 ? 0 : 1,
		limit:true
	};

	// returns the element that needs to be animated to scroll the window.
	// kept for backwards compatibility (specially for localscroll & serialscroll)
	$scrollto.window = function( scope ){
		return $(window)._scrollable();
	};

	// hack, hack, hack :)
	// returns the real elements to scroll (supports window/iframes, documents and regular nodes)
	$.fn._scrollable = function(){
		return this.map(function(){
			var elem = this,
				iswin = !elem.nodename || $.inarray( elem.nodename.tolowercase(), ['iframe','#document','html','body'] ) != -1;

				if( !iswin )
					return elem;

			var doc = (elem.contentwindow || elem).document || elem.ownerdocument || elem;
			
			return /webkit/i.test(navigator.useragent) || doc.compatmode == 'backcompat' ?
				doc.body : 
				doc.documentelement;
		});
	};

	$.fn.scrollto = function( target, duration, settings ){
		if( typeof duration == 'object' ){
			settings = duration;
			duration = 0;
		}
		if( typeof settings == 'function' )
			settings = { onafter:settings };
			
		if( target == 'max' )
			target = 9e9;
			
		settings = $.extend( {}, $scrollto.defaults, settings );
		// speed is still recognized for backwards compatibility
		duration = duration || settings.duration;
		// make sure the settings are given right
		settings.queue = settings.queue && settings.axis.length > 1;
		
		if( settings.queue )
			// let's keep the overall duration
			duration /= 2;
		settings.offset = both( settings.offset );
		settings.over = both( settings.over );

		return this._scrollable().each(function(){
			// null target yields nothing, just like jquery does
			if (target == null) return;

			var elem = this,
				$elem = $(elem),
				targ = target, toff, attr = {},
				win = $elem.is('html,body');

			switch( typeof targ ){
				// a number will pass the regex
				case 'number':
				case 'string':
					if( /^([+-]=)?\d+(\.\d+)?(px|%)?$/.test(targ) ){
						targ = both( targ );
						// we are done
						break;
					}
					// relative selector, no break!
					targ = $(targ,this);
					if (!targ.length) return;
				case 'object':
					// domelement / jquery
					if( targ.is || targ.style )
						// get the real position of the target 
						toff = (targ = $(targ)).offset();
			}
			$.each( settings.axis.split(''), function( i, axis ){
				var pos	= axis == 'x' ? 'left' : 'top',
					pos = pos.tolowercase(),
					key = 'scroll' + pos,
					old = elem[key],
					max = $scrollto.max(elem, axis);

				if( toff ){// jquery / domelement
					attr[key] = toff[pos] + ( win ? 0 : old - $elem.offset()[pos] );

					// if it's a dom element, reduce the margin
					if( settings.margin ){
						attr[key] -= parseint(targ.css('margin'+pos)) || 0;
						attr[key] -= parseint(targ.css('border'+pos+'width')) || 0;
					}
					
					attr[key] += settings.offset[pos] || 0;
					
					if( settings.over[pos] )
						// scroll to a fraction of its width/height
						attr[key] += targ[axis=='x'?'width':'height']() * settings.over[pos];
				}else{ 
					var val = targ[pos];
					// handle percentage values
					attr[key] = val.slice && val.slice(-1) == '%' ? 
						parsefloat(val) / 100 * max
						: val;
				}

				// number or 'number'
				if( settings.limit && /^\d+$/.test(attr[key]) )
					// check the limits
					attr[key] = attr[key] <= 0 ? 0 : math.min( attr[key], max );

				// queueing axes
				if( !i && settings.queue ){
					// don't waste time animating, if there's no need.
					if( old != attr[key] )
						// intermediate animation
						animate( settings.onafterfirst );
					// don't animate this axis again in the next iteration.
					delete attr[key];
				}
			});

			animate( settings.onafter );			

			function animate( callback ){
				$elem.animate( attr, duration, settings.easing, callback && function(){
					callback.call(this, target, settings);
				});
			};

		}).end();
	};
	
	// max scrolling position, works on quirks mode
	// it only fails (not too badly) on ie, quirks mode.
	$scrollto.max = function( elem, axis ){
		var dim = axis == 'x' ? 'width' : 'height',
			scroll = 'scroll'+dim;
		
		if( !$(elem).is('html,body') )
			return elem[scroll] - $(elem)[dim.tolowercase()]();
		
		var size = 'client' + dim,
			html = elem.ownerdocument.documentelement,
			body = elem.ownerdocument.body;

		return math.max( html[scroll], body[scroll] ) 
			 - math.min( html[size]  , body[size]   );
	};

	function both( val ){
		return typeof val == 'object' ? val : { top:val, left:val };
	};

})( jquery );