/*
	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).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:             3000,
    slideShowSpeed:             'normal',
    slideShow:                  true
  };
  $.fn.bgStretcher.settings = {};
})(jQuery);