<?php

/**
 * @class CommonClass
 * @brief Collection of some common function
 * @details
 */
class CommonClass
{
	/*
	 * @brief generate a random string
	*/
	public static function generateRandomString($length = 10) {
		$characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
		$randomString = '';
		for ($i = 0; $i < $length; $i++)
			$randomString .= $characters[rand(0, strlen($characters) - 1)];
		return $randomString;
	}

	/*
	 * @brief timestamp to DDTime conversion
	*/
	public static function timeStampToDDTime($timeStamp)
	{
		$y = date("Y",$timeStamp);
		$d = date("z",$timeStamp);
		if (strlen($d) == 0)
			$d = "000";
		else if (strlen($d) == 1)
			$d = "00".$d;
		else if (strlen($d) == 2)
			$d = "0".$d;
		$t = date("His",$timeStamp)."000";
		return $y.$d.$t;
	}
	/*
	 * @brief DDTime to timestamp conversion
	*/
	public static function DDTimeToTimeStamp($DDTime)
	{
	   date_default_timezone_set('UTC');
		$date = DateTime::createFromFormat('YzHisu', $DDTime);
		
		return strtotime($date->format("Y-m-d\TH:i:s"));
	}	
	
	/*
	 * @brief DDTime to ISO conversion
	*/
	public static function DDTimeToIso($DDTime)
	{
		$date = DateTime::createFromFormat('YzHisu', $DDTime);
		
		return $date->format("Y-m-d\TH:i:s");
	}
	
	/*
	 * @brief DDTime to ISO conversion
	*/
	public static function DDStartIntervalToStopIso($DDStart, $DDInterval)
	{		
		$startStamp = self::DDTimeToTimeStamp($DDStart);
		$intStamp = self::DDTimeToTimeStamp($DDInterval);
		
		return date("Y-m-d\TH:i:s", $startStamp + $intStamp);
	}
	
	public static function rrmdir($dir)
	{
		if (is_dir($dir)) 
		{
			$objects = scandir($dir);
			foreach ($objects as $object) 
			{ // Recursively delete a directory that is not empty and directorys in directory 
				if ($object != "." && $object != "..") 
				{  // If object isn't a directory recall recursively this function 
					if (filetype($dir."/".$object) == "dir")
						self::rrmdir($dir."/".$object);
					else
						unlink($dir."/".$object);
				}
			}
			reset($objects);
			rmdir($dir);
		}
	}
}

?>