<?php
/**
 * @file
 * Trivial logger for easier debug.
 */

namespace OSInet\Class_Grapher;

class Logger {
  public $fDebugLevel;

  public function __construct($debugLevel = LOG_WARNING) {
    $this->debugLevel($debugLevel);
  }

  /**
   * Get or Set the current debug level.
   *
   * @param int $level
   *   LOG_EMERG to LOG_DEBUG. If NULL, do not set it.
   *
   * @return
   *   The value of the debug level before this function was called.
   */
  public function debugLevel($level = NULL) {
    $ret = $this->fDebugLevel;

    if (isset($level)) {
      if ($level < LOG_EMERG) {
        $level = LOG_EMERG;
      }
      if ($level > LOG_DEBUG) {
        $level = LOG_DEBUG;
      }
      $this->fDebugLevel = $level;
    }

    return $ret;
  }

  /**
   * Output a message on STDERR if its relevance is above minimum level.
   *
   * @param string $message
   * @param int $level
   *   Defined in RFC 3164, section 4.1.1 "Severity". But compare with Drupal 7
   *   WATCHDOG_* constants in includes/bootstrap.inc for an explanation about
   *   syslog constants in PHP.
   */
  public function debug($message = "\n", $level = LOG_INFO) {
    if ($level <= $this->fDebugLevel) {
      fputs(STDERR, $message);
      fflush(STDERR);
    }
  }
}