/*
 * 
 * Thumbnailer function by fluidByte (http://www.fluidbyte.net)
 * 
 * Example:
 * ------------------------------------------------------------------
 * buildThumbnail('/website/images/somefile.jpg','width',200,5,false);
 * 
 * 
 * Passed Variables:
 * ------------------------------------------------------------------
 * 1.) Path (from root) to the image
 * 2.) Type of resize - i.e. by 'width' or 'height'
 * 3.) Maximum size of thumbnail
 * 4.) Quality (1-10)
 * 5.) Square crop (true/false)
 * 
 * 
 * ------------------------------------------------------------------
 * 
 * NOTE: In order for this function to work you must have a folder
 * called "thumbs" inside the directory where your image resides.
 * This folder must have write permissions.
 * 
 * 
 */
 

function buildThumbnail($img,$type,$max,$quality,$square_crop){
	
	// Split image parts (path and file)
	$imgSplit = explode("/",$img);
	$sourceName = end($imgSplit);
	$imgpath = str_ireplace($sourceName, "", $img);
	
	// Paths
	$sourcePath = $_SERVER['DOCUMENT_ROOT'] . $imgpath;
	$sourceUrl = $imgpath;
	
	// Get extension
	$split = explode(".",$sourceName);
	$ext = strtolower($split[1]);
	
	
	$thumbUrl = $sourceUrl . 'thumbs/';
	$thumbName = "thm_$sourceName";
	$thumbPath = $sourcePath . 'thumbs';
	$thumbQuality = $quality;
		
	// If the thumbnail doesn't exist, create the mofo! #################################
	
	if(!file_exists("$thumbPath/$thumbName")){
	
		switch($ext){
			case('jpg'):
			$sourceImage = imagecreatefromjpeg("$sourcePath/$sourceName");
			break;
			case('jpeg'):
			$sourceImage = imagecreatefromjpeg("$sourcePath/$sourceName");
			break;
			case('png'):
			$sourceImage = imagecreatefrompng("$sourcePath/$sourceName");
			break;
			case('gif'):
			$sourceImage = imagecreatefromgif("$sourcePath/$sourceName");
			break;
		}
		
		$sourceWidth = imagesx($sourceImage);
		$sourceHeight = imagesy($sourceImage);
		
		// Determine specs based on type
		
		if(strtolower($type)=="width"){
			$thumbWidth = $max;
			$thumbHeight = $sourceHeight/($sourceWidth/$thumbWidth);
		}
		else{
			$thumbHeight = $max;
			$thumbWidth = $sourceWidth/($sourceHeight/$thumbHeight);
		}
		
		// Determine specs if crop applied
		
		$srcX = 0; $srcY = 0;
		$sourceNewWidth = $sourceWidth; $sourceNewHeight = $sourceHeight;
		$dest = $sourceImage;
		
		if($square_crop==true){
			$thumbWidth = $max;
			$thumbHeight = $max;
			
			if($sourceHeight>$sourceWidth){
				$srcX = 0;
				$srcY = floor(($sourceHeight-$sourceWidth)/2);
				$sourceNewHeight = $sourceWidth;
				$sourceNewWidth = $sourceWidth;
			}
			
			if($sourceWidth>$sourceHeight){
				$srcX = floor(($sourceWidth-$sourceHeight)/2);
				$srcY = 0;
				$sourceNewHeight = $sourceHeight;
				$sourceNewWidth = $sourceHeight;
			}
			// Create new image with a new width and height.
			$dest = imagecreatetruecolor($sourceNewWidth, $sourceNewHeight);
			
			// Copy new image to memory after cropping.
			imagecopy($dest, $sourceImage, 0, 0, $srcX, $srcY, $sourceNewWidth, $sourceNewHeight);
		}
		
		
		
		$targetImage = imagecreatetruecolor($thumbWidth,$thumbHeight);	
		imagecopyresampled($targetImage,$dest,0,0,0,0,$thumbWidth,$thumbHeight,$sourceNewWidth,$sourceNewHeight);
		
		switch($ext){
			case('jpg'):
				imagejpeg($targetImage, "$thumbPath/$thumbName", $thumbQuality * 10);
				break;
			case('jpeg'):
				imagejpeg($targetImage, "$thumbPath/$thumbName", $thumbQuality * 10);
				break;
			case('png'):
				imagepng($targetImage, "$thumbPath/$thumbName", $thumbQuality);
				break;
			case('gif'):
				imagegif($targetImage, "$thumbPath/$thumbName");
				break;
		}
		
	}
	
	// Return the thumbnail #############################################################
	return("<img src=\"$thumbUrl$thumbName\" />");
	
	imagedestroy($dest);
	imagedestroy($targetImage);
}