/*

	Background Stretcher jQuery Plugin

	© 2009 ajaxBlender.com

	For any questions please visit www.ajaxblender.com 

	or email us at support@ajaxblender.com

	

	Version: 1.2

*/



;(function($){

	/*  Variables  */

	var container = null;

	var allImgs = '', allLIs = '', containerStr = '';

	

	var element = this;

	var _bgStretcherPause = false;

	var _bgStretcherTm = null;

	

	$.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){

				_bgStretcherTm = setTimeout('$.fn.bgStretcher.slideShow()', settings.nextSlideDelay);

			}

			_resize();

		};

		

		function _resize(){

			var winW = $(window).width();

			var winH = $(window).height();

			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.play = function(){

       _bgStretcherPause = false;

       $.fn.bgStretcher._clearTimeout();

       $.fn.bgStretcher.slideShow();

       

	};

	

	$.fn.bgStretcher._clearTimeout = function(){

       if(_bgStretcherTm != null){

           clearTimeout(_bgStretcherTm);

           _bgStretcherTm = null;

       }

	}

	

	$.fn.bgStretcher.pause = function(){

	   _bgStretcherPause = true;

	   $.fn.bgStretcher._clearTimeout();

	};

	

	$.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 );

		

		if(!_bgStretcherPause){

		  _bgStretcherTm = setTimeout('$.fn.bgStretcher.slideShow()', $.fn.bgStretcher.settings.nextSlideDelay);

		}

	};

	

	/*  Default Settings  */

	$.fn.bgStretcher.defaults = {

		imageContainer:             'bgstretcher',

		resizeProportionally:       true,

		resizeAnimate:              false,

		images:                     [],

		imageWidth:                 1024,

		imageHeight:                768,

		nextSlideDelay:             5000,

		slideShowSpeed:             'normal',

		slideShow:                  true

	};

	$.fn.bgStretcher.settings = {};

})(jQuery);