<?php
/**
* For future use in conjuction with Flashservice to handle multi user chats.
*
* @filesource
* @package General classes
* @author Henrik Sarvell
*/
class FileDirExt{
  	/**
  	* Opens a directory and stores the filenames in the array, has a directory object as parameter.
  	*/
  	static function dirAsArr(&$d){
      $arr = array();
      for($i = 0; false !== ($entry = $d->read()); $i++){
        if($entry != "." && $entry != "..") 	
          array_push($arr,$entry);
      }
      return $arr;
	}
	
   /**
	 * Same functionality as dirAsArr() but accepts a string representing the
	 * directory name.
	 *
	 * @uses FileDirExt::dirAsArr()
	 * @param string $strDir the directory path
	 * @return array the array with filenames
	 */
	static function list_dir($strDir){
		$d = dir($strDir);
		return self::dirAsArr($d);
	}
	
	/**
	 * Lists all the files in a directory, ignores subdirectories.
	 * 
	 * @uses FileDirExt::dirAsArr() To get the filenames in an array
	 * @param string $strDir The directory path to look in, must have trailing /
	 */
	static function list_files_in_dir($strDir){
		$d = dir($strDir);
		$temp = self::dirAsArr($d);
		$rarr = array();
		foreach($temp as $item){
			if(is_file("$strDir/$item")){
				$rarr[] = $item;
			}
		}
		return $rarr;
	} 
	
	static function clearDir($strDir){
		$files = self::list_files_in_dir($strDir);
		foreach($files as $file){
			unlink("$strDir/$file");
		}
	}
	
	/**
	* Searches a file for needle and replaces with replacement
	*/
	static function replaceInFile($fileName, $needle, $replacement){
	  	$lines = file($fileName);
	  	foreach($lines as &$line){
		    $line = str_replace($needle, $replacement, $line);
		}
		return $lines;
	}
	
	/**
	* Gets the number of times the needle occurs in a file
	*/
	static function searchCountInFile($fileName, $needle){
	  	$lines = file($fileName);
	  	if($lines === false)
	  		return 0;
	  	$count = 0;
	  	foreach($lines as &$line){
	  	  	$count += substr_count($line, $needle);
		}
		
		return $count;
	}
	
	
	/**
	* Writes an array to file
	*/
	static function emptyWrite2D(&$arr, $fileName){
	  	$handle = fopen($fileName, "w+");
	  	foreach($arr as $line){
		    fwrite($handle, $line);
		}
		fclose($handle);
	}
	
	/**
	* Replaces a needle in a whole directory
	*/
	static function replaceInDir(&$dir, $needle, $replacement){
	  	$fileNames = self::dirAsArr($dir);
	  	foreach($fileNames as $fileName){
	  	  	$fileName = $dir->path."/".$fileName;
		    $fileAsArr = self::replaceInFile($fileName, $needle, $replacement);
		    self::emptyWrite2D($fileAsArr, $fileName);
		}
	}
	
	/**
	* Returns an array with all the files where the needle occurs
	*/
	static function getTargetsInDir(&$dir, $needle){
	  	$fileNames = self::dirAsArr($dir);
	  	$files = array();
	  	foreach($fileNames as $fileName){
	  	  	$fileName = $dir->path."/".$fileName;
		    if(self::searchCountInFile($fileName, $needle) > 0)
		    	array_push($files, $fileName);
		}
		
		return $files;
	}
	
	/**
	* Creates a download.
	*/
	static function download_file($filename, $ctype){
		header("Pragma: public"); // required
		header("Expires: 0");
		header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
		header("Cache-Control: private",false); // required for certain browsers 
		header("Content-Type: $ctype");
		header("Content-Disposition: attachment; filename=\"".basename($filename)."\";" );
		header("Content-Transfer-Encoding: binary");
		header("Content-Length: ".filesize($filename));
		readfile("$filename");
	}
}
?>