<?php
  /**
   * Copyright (c) 2013 Bart Visscher <bartv@thisnet.nl>
   * This file is licensed under the Affero General Public License version 3 or
   * later.
   * See the COPYING-README file.
   */
  
  namespace OC;

  use \OCP\ILogger;

  /**
   * logging utilities
   *
   * This is a stand in, this should be replaced by a Psr\Log\LoggerInterface
   * compatible logger. See https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-3-logger-interface.md
   * for the full interface specification.
   *
   * MonoLog is an example implementing this interface.
   */

  class Log implements ILogger {
  
  	private $logger;
  
  	/**
  	 * @param string $logger The logger that should be used
  	 */
  	public function __construct($logger=null) {
  		// FIXME: Add this for backwards compatibility, should be fixed at some point probably
  		if($logger === null) {
  			$this->logger = 'OC_Log_'.ucfirst(\OC_Config::getValue('log_type', 'owncloud'));
  			call_user_func(array($this->logger, 'init'));
  		} else {
  			$this->logger = $logger;
  		}
  
  	}

  
  	/**
  	 * System is unusable.
  	 *
  	 * @param string $message
  	 * @param array $context
  	 */
  	public function emergency($message, array $context = array()) {
  		$this->log(\OC_Log::FATAL, $message, $context);
  	}
  
  	/**
  	 * Action must be taken immediately.
  	 *
  	 * Example: Entire website down, database unavailable, etc. This should
  	 * trigger the SMS alerts and wake you up.
  	 *
  	 * @param string $message
  	 * @param array $context
  	 */
  	public function alert($message, array $context = array()) {
  		$this->log(\OC_Log::ERROR, $message, $context);
  	}
  
  	/**
  	 * Critical conditions.
  	 *
  	 * Example: Application component unavailable, unexpected exception.
  	 *
  	 * @param string $message
  	 * @param array $context
  	 */
  	public function critical($message, array $context = array()) {
  		$this->log(\OC_Log::ERROR, $message, $context);
  	}
  
  	/**
  	 * Runtime errors that do not require immediate action but should typically
  	 * be logged and monitored.
  	 *
  	 * @param string $message
  	 * @param array $context
  	 */
  	public function error($message, array $context = array()) {
  		$this->log(\OC_Log::ERROR, $message, $context);
  	}
  
  	/**
  	 * Exceptional occurrences that are not errors.
  	 *
  	 * Example: Use of deprecated APIs, poor use of an API, undesirable things
  	 * that are not necessarily wrong.
  	 *
  	 * @param string $message
  	 * @param array $context
  	 */
  	public function warning($message, array $context = array()) {
  		$this->log(\OC_Log::WARN, $message, $context);
  	}
  
  	/**
  	 * Normal but significant events.
  	 *
  	 * @param string $message
  	 * @param array $context
  	 */
  	public function notice($message, array $context = array()) {
  		$this->log(\OC_Log::INFO, $message, $context);
  	}
  
  	/**
  	 * Interesting events.
  	 *
  	 * Example: User logs in, SQL logs.
  	 *
  	 * @param string $message
  	 * @param array $context
  	 */
  	public function info($message, array $context = array()) {
  		$this->log(\OC_Log::INFO, $message, $context);
  	}
  
  	/**
  	 * Detailed debug information.
  	 *
  	 * @param string $message
  	 * @param array $context
  	 */
  	public function debug($message, array $context = array()) {
  		$this->log(\OC_Log::DEBUG, $message, $context);
  	}

  
  	/**
  	 * Logs with an arbitrary level.
  	 *
  	 * @param mixed $level
  	 * @param string $message
  	 * @param array $context
  	 */
  	public function log($level, $message, array $context = array()) {
  		if (isset($context['app'])) {
  			$app = $context['app'];
  		} else {
  			$app = 'no app in context';
  		}

  		// interpolate $message as defined in PSR-3
  		$replace = array();
  		foreach ($context as $key => $val) {
  			$replace['{' . $key . '}'] = $val;
  		}
  
  		// interpolate replacement values into the message and return
  		$message = strtr($message, $replace);
  
  		$logger = $this->logger;
  		call_user_func(array($logger, 'write'), $app, $message, $level);

  	}
  }