dojo.require("dojo.lfx.*");
questia.Package( "coreweb.common" );

coreweb.common.ImageUtils = {};
coreweb.common.ImageUtils.divid = null;
coreweb.common.ImageUtils.imageid = null;
coreweb.common.ImageUtils.lastImage = null;
coreweb.common.ImageUtils.imageIndex = 0;
coreweb.common.ImageUtils.bannerImages = null;
coreweb.common.ImageUtils.ROTATE_DELAY = 9000;
coreweb.common.ImageUtils.blendImage = function( divid, imageid, imagefile, lastImage, imageIndex, bannerImages ) {
	  
	  if ( lastImage != null ) {
    	  var imageel = document.getElementById(imageid);
	      imageel.src = lastImage;  
    	  imageel.style.opacity = .99;
	      imageel.style.MozOpacity = .99;
		  imageel.style.KhtmlOpacity = .99;
	      imageel.style.filter = "alpha(opacity=" + 100 + ")"; 
	  }
	  document.getElementById(divid).style.background = "url(" + imagefile + ") no-repeat";
	  dojo.lfx.html.fadeOut(imageid, 2000).play();
	  coreweb.common.ImageUtils.lastImage = imagefile;
	  var nextIndex = imageIndex + 1;
	  if ( nextIndex >= bannerImages.length ) {
	      nextIndex = 0;
	  }
	  if ( !bannerImages[nextIndex].src  ) {
	     preloadImg = new Image();
         preloadImg.src = bannerImages[nextIndex];
	     bannerImages[nextIndex] = preloadImg;
	  }
}

coreweb.common.ImageUtils.getImagePath = function( index, bannerImages ) {
	  if ( coreweb.common.ImageUtils.bannerImages[index].src  ) {
	       return coreweb.common.ImageUtils.bannerImages[index].src;
	  } else {
		   return coreweb.common.ImageUtils.bannerImages[index];
	  }
}

coreweb.common.ImageUtils.doBlend = function(divid, imageid, lastImage, imageIndex, bannerImages, rotateDelay ) {		
		
	if ( rotateDelay != null ) {
		coreweb.common.ImageUtils.ROTATE_DELAY = rotateDelay;
	}
	
	if(coreweb.common.ImageUtils.divid == null) {
		coreweb.common.ImageUtils.divid = divid;
	}
	
	if(coreweb.common.ImageUtils.imageid == null) {
		coreweb.common.ImageUtils.imageid = imageid;
	}
	
	if(coreweb.common.ImageUtils.bannerImages == null) {
		coreweb.common.ImageUtils.bannerImages = bannerImages;
	}
	
	coreweb.common.ImageUtils.lastImage = lastImage;
	coreweb.common.ImageUtils.imageIndex = imageIndex;
	
	coreweb.common.ImageUtils.imageIndex++;
	
    if ( coreweb.common.ImageUtils.imageIndex >= coreweb.common.ImageUtils.bannerImages.length ) {
    	coreweb.common.ImageUtils.imageIndex = 0;
    }
    
    coreweb.common.ImageUtils.blendImage(coreweb.common.ImageUtils.divid, 
    		                             coreweb.common.ImageUtils.imageid, 
    		                             coreweb.common.ImageUtils.getImagePath(
    		                            		 coreweb.common.ImageUtils.imageIndex, 
    		                            		 coreweb.common.ImageUtils.bannerImages), 
	                            		 coreweb.common.ImageUtils.lastImage, 
	                            		 coreweb.common.ImageUtils.imageIndex, 
	                            		 coreweb.common.ImageUtils.bannerImages );
    
    setTimeout( 'coreweb.common.ImageUtils.doAutoBlend()', coreweb.common.ImageUtils.ROTATE_DELAY );
}

coreweb.common.ImageUtils.doAutoBlend = function() {
	
	if ( questia.Dictionary.loginSubmitted == true ) {
		   return;
	}
	
    coreweb.common.ImageUtils.imageIndex++;
	
    if ( coreweb.common.ImageUtils.imageIndex >= coreweb.common.ImageUtils.bannerImages.length ) {
    	coreweb.common.ImageUtils.imageIndex = 0;
    }
    
    coreweb.common.ImageUtils.blendImage(coreweb.common.ImageUtils.divid, 
    		                             coreweb.common.ImageUtils.imageid, 
    		                             coreweb.common.ImageUtils.getImagePath(
    		                            		 coreweb.common.ImageUtils.imageIndex, 
    		                            		 coreweb.common.ImageUtils.bannerImages), 
	                            		 coreweb.common.ImageUtils.lastImage, 
	                            		 coreweb.common.ImageUtils.imageIndex, 
	                            		 coreweb.common.ImageUtils.bannerImages );
    
	setTimeout( 'coreweb.common.ImageUtils.doAutoBlend()', coreweb.common.ImageUtils.ROTATE_DELAY );
}