<?php

define('PROJECT_LOGS_DIR', $cwd. '/log');

class logger {

  private $handle;
 
  /**
   * Get Filename for writing to Log file
   * @param string $filename for log
   * @param int $max_count of lines before file wipe, to keep small logs.
   */
  public function __construct(string $filename = 'neato_Installer', int $max_count = 1000) {
    if (strpos($filename, "..") !== false) {
      $this->handle = false; // Too dangerious, so return false
    } else {
      
      if (! is_dir(PROJECT_LOGS_DIR)){
        //Directory does not exist, so lets create it.
        mkdir(PROJECT_LOGS_DIR, 0775);
      }
      
      $filename = preg_replace("|[^A-Za-z0-9_]|", "", $filename);
      $filename = escapeshellcmd($filename);
      $file = PROJECT_LOGS_DIR  . '/' . $filename . ".log.txt";
      
      if ($max_count > 1) {
        if ($this->get_lines($file) > $max_count) {
          unlink($file);
        }
      }
      
      $success = touch($file);
      if ($success === false) {
        $this->handle = false;
        return false;
      }
      chmod($file, 0660);
      if (! is_writable($file)) {
        $this->handle = false;
        return false;        
      }
      $this->handle = fopen($file, 'a');
    }
  }

  /**
   * Count number of lines in Log File
   * @param string $file
   * @return int line count
   */
  public function get_lines(string $file): int {
    // No such file, so return zero for length.
    if (! file_exists($file)) {
      return 0;
    }
    
    $f = fopen($file, 'rb');
    $lines = 0;
    
    if ($f === false || !is_resource($f)) {
      return 0;
    }

    while (!feof($f)) {
      $line = fread($f, 8192);
      if ($line === false) {
        return 0;
      }
      $lines += substr_count($line, "\n");
    }

    fclose($f);

    return $lines;
  }
  
  /**
   * Write to Log File
   * @param string $message to save
   * @return bool able to write to log file
   */
  public function write(string $message): bool {
    if ( $this->handle === false || ! is_resource($this->handle) ) {
      return false; 
    }
    $tz = configure::get('logger_time_zone');
    if ($tz !== false && !empty($tz)) {
      $tz_obj = new \DateTimeZone($tz);
      $dt = new \DateTime();
      $dt->setTimezone($tz_obj);
      $now = $dt->format('g:i A \o\n l jS F Y');
    } else {
      $dt = new \DateTime();
      $now = $dt->format('g:i A \o\n l jS F Y');
    }
    fwrite($this->handle, $now . ' - ' . print_r($message, true) . "\n");
    return true;
  }

  /**
   * Close Log File Handle
   */
  public function __destruct() {
    if ($this->handle !== false && is_resource($this->handle)) {
      fclose($this->handle);
    }
  }

} // end of Logger