/*
	Background Stretcher jQuery Plugin
	(c) 2009 ajaxBlender.com
*/

;(function($){
	/*  Variables  */
	var container = null;
	var allImgs = '', allLIs = '', containerStr = '';

	var element = this;

	$.fn.bgStretcher = function(settings){
		settings = $.extend({}, $.fn.bgStretcher.defaults, settings);
		$.fn.bgStretcher.settings = settings;

		function _build(){
			if(!settings.images.length){ return; }

			_genHtml();

			containerStr = '#' + settings.imageContainer;
			container = $(containerStr);
			allImgs = '#' + settings.imageContainer + ' IMG';
			allLIs = '#' + settings.imageContainer + ' LI';

			$(allLIs).hide();
			$(allLIs + ':first').show().addClass('bgs-current');

			if(!container.length){ return; }
			$(window).resize(_resize);

			if(settings.slideShow && $(allImgs).length > 1){
				setTimeout('jQuery.fn.bgStretcher.slideShow()', settings.nextSlideDelay);
			}
			_resize();
		};

		function _resize(){
			var winH = winW = $(window).width() / 2;  // HACK
			//var winH = $(window).height(); // HACK
			var imgW = 0, imgH = 0;

			//	Update container's height
			container.width(winW);
			container.height(winH);

			//	Non-proportional resize
			if(!settings.resizeProportionally){
				imgW = winW;
				imgH = winH;
			} else {
				var initW = settings.imageWidth, initH = settings.imageHeight;
				var ratio = initH / initW;

				imgW = winW;
				imgH = winW * ratio;

				if(imgH < winH){
					imgH = winH;
					imgW = imgH / ratio;
				}
			}

			//	Apply new size for images
			if(!settings.resizeAnimate){
				$(allImgs).width(imgW).height(imgH);
			} else {
				$(allImgs).animate({width: imgW, height: imgH}, 'normal');
			}
		};

		function _genHtml(){
			var code = '<div id="' + settings.imageContainer + '" class="bgstretcher"><ul>';
			for(i = 0; i < settings.images.length; i++){
				code += '<li><img src="' + settings.images[i] + '" alt="" /></li>';
			}
			code += '</ul></div>';
			$(code).appendTo('body');
		};

		/*  Start bgStretcher  */
		_build();
	};

	$.fn.bgStretcher.slideShow = function(){
		var current = $(containerStr + ' LI.bgs-current');
		var next = current.next();
		if(!next.length){
			next = $(containerStr + ' LI:first');
		}

		$(containerStr + ' LI').removeClass('bgs-current');
		next.addClass('bgs-current');

		next.fadeIn( $.fn.bgStretcher.settings.slideShowSpeed );
		current.fadeOut( $.fn.bgStretcher.settings.slideShowSpeed );

		setTimeout('jQuery.fn.bgStretcher.slideShow()', jQuery.fn.bgStretcher.settings.nextSlideDelay);
	};

	/*  Default Settings  */
	$.fn.bgStretcher.defaults = {
		imageContainer:             'bgstretcher',
		resizeProportionally:       true,
		resizeAnimate:              false,
		images:                     [],
		imageWidth:                 1024,
		imageHeight:                768,
		nextSlideDelay:             3000,
		slideShowSpeed:             'normal',
		slideShow:                  false
	};
	$.fn.bgStretcher.settings = {};
})(jQuery);