<?php
/**
  * crontab Class
  * @param  string  $script full crontab script as passed
  * @param  string  $taskName hashed/ commentred task name
  * @param  string  $taskDesc hashed/ commentred task description - can be null
  * @param  string  $cronPattern crontab time pattern
  */
class crontab {
	
    public function __construct($script, $taskName, $taskDesc = null, $cronPattern) 
    {
		require_once("ADLog.class.php");
		$this->log = ADLog::getInstance();

		// Set some variables for file and folder creation
		$this->script = $script;
		$this->taskName = $taskName;
		$this->taskDesc = $taskDesc;
		$this->cronPattern = $cronPattern;
        $this->crontabContent = $this->taskName . PHP_EOL . $this->taskDesc . PHP_EOL . $this->cronPattern . $this->script;

		/* File and DIR variables for global use */
		$this->cronFolder = "/home/rconfig/cronfeed";
		$this->filename   = "cronfeed.txt";
		$this->fullpath   = $this->cronFolder . "/" . $this->filename ;
		
	}

/**
  * addCron method
  * @return boolean returns true if all tasks pass
  */		
	public function addCron () 
	{
		// Type your code here
		if($this->_createCronDir() && $this->_createCronFile()) {
			$this->_chmodCronFile($this->fullpath, 0666);
			$this->_appendToCronFile($this->fullpath, $this->crontabContent);
			$this->_updateCronTab($this->fullpath);
			$this->_chmodCronFile($this->fullpath, 0444);
			$ret = true;
		} else {
			$ret = false;
		}
		return $ret;
	}

/**
  * addCron method
  * @return boolean returns true if all tasks pass
  */		
	public function removeCron($delTaskName, $delTaskDesc, $delCronJob) 
	{
		$fileOutput = $this->_readCronFromFile($this->fullpath);
		// unset taskName, taskDesc, and Task from array
		if (is_array($fileOutput)) {
			$newArray = array();
			$newArray = $this->_arraySearchUnset($delTaskName, $fileOutput);
			$newArray = $this->_arraySearchUnset($delTaskDesc, $newArray);
			$newArray = $this->_arraySearchUnset($delCronJob, $newArray);
			$this->_chmodCronFile($this->fullpath, 0666);
			if($this->_overwriteCronFile($this->fullpath, $newArray) == true);
			$this->_updateCronTab($this->fullpath);
			$this->_chmodCronFile($this->fullpath, 0444);
			$ret = true;
		} else {
			$ret = false;
		}
		return $ret;
	}	
	
/**
  * _chmodCronFile method
  */	
	private function _chmodCronFile($file, $value)
	{
		chmod($file, $value);
	}

/**
  * _appendToCronFile method
  */		
	private function _appendToCronFile($file, $content)
	{
		file_put_contents($file, $content . PHP_EOL, FILE_APPEND); // append file with new task
	}

/**
  * _overwriteCronFile method
  */		
	private function _overwriteCronFile($file, $content)
	{
		if($fh = fopen($file, 'w+')){
			$string = '';
			foreach ($content as $key => $val) {
				$string .= "$val\n";
			}
			file_put_contents($file, $string);
			fclose($fh);
			return true;
		} else {
		 return false;
		}
	}
	
/**
  * _appendToCronFile method
  * @desc read cronfeed.txt into array
  */		
	private function _readCronFromFile($file)
	{
		$arr = file($file, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);	
		return $arr;
	}
	
/**
  * _updateCronTab method
  */		
	private function _updateCronTab($file)
	{
		echo shell_exec('sudo -u apache /usr/bin/crontab ' . $file . '  2>&1');
		/* to check crontab -l on the server directly you must sudo to apache
         *  i.e. sudo -u apache /usr/bin/crontab -l */
	}

/**
  * _arraySearchUnset method
  */		
	private function _arraySearchUnset($item, $array)
	{
		$taskNameindex = array_search($item, $array);
		if ($taskNameindex !== FALSE) {
			unset($array[$taskNameindex]);
		}
	return $array;
	}
	
/**
  * _createCronDir method
  * @return boolean returns true if all tasks pass
  */
	private function _createCronDir() 
	{
		// create hostname dir based on hostname if not already present
		if (!is_dir($this->cronFolder)) {
			if (mkdir($this->cronFolder, 0777)) {
				$this->log->Info("Success: Created " . $this->cronFolder . " Directory (File: " . $_SERVER['PHP_SELF'] . ")");
				return true;
			} else {
				$errors['cronFolder'] = "Could not create " . $this->cronFolder; // throw an error
				$this->log->Warn("Failure: Could not create " . $this->cronFolder . " (File: " . $_SERVER['PHP_SELF'] . ")");
				return false;
			}
		} else {
			return true;
		}
	}
	
/**
  * _createCronFile method
  * @return boolean returns true if all tasks pass
  */
	private function _createCronFile()
	{   
        // check if cronfeed.txt exists and create it if NOT
        if (!file_exists($this->fullpath)) {
            $handle = fopen($this->fullpath, 'w'); // create cronfeed.txt if not 
            if (file_exists($this->fullpath)) {
                $this->log->Info("Success: Created " . $this->fullpath . " file (File: " . $_SERVER['PHP_SELF'] . ")");
				return true;
            } else {
                $errors['fileCreateError'] = "Could not create " . $this->fullpath; // throw an error
                $this->log->Warn("Failure: Could not create " . $this->fullpath . " file (File: " . $_SERVER['PHP_SELF'] . ")");
				return false;
            }
            fclose($handle); // close handle that created the file
        } else {
			return true;
		}
	}
	
} // end class
?>