<?php
/**
 * Copyright 2009, 2010 AEGEE-Europe
 *
 * This file is part of AEGEE-Europe Online Membership System.
 *
 * AEGEE-Europe Online Membership System is free software: you can
 * redistribute it and/or modify it under the terms of the GNU General
 * Public License as published by the Free Software Foundation, either
 * version 3 of the License, or (at your option) any later version.
 *
 * AEGEE-Europe Online Membership System is distributed in the hope
 * that it will be useful, but WITHOUT ANY WARRANTY; without even the
 * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE.  See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with AEGEE-Europe Online Membership System.  If not, see
 * <http://www.gnu.org/licenses/>.
 */

/**
 * Provides a logger
 */

class Logger {
	private $logfile;
	private $messages;

	/**
	 * Constructor
	 *
	 * @param string logfile
	 */
	public function __construct($logfile) {
		$this->logfile = $logfile;
		$this->messages = array();
	}

	/**
	 * Log an error to file
	 *
	 * @param string error message to be logged
	 */
	public function error($msg) {
		$this->dolog("ERROR", $msg);
		$this->messages[] = array("Severity"=>"ERROR", "Message"=>$msg);
	}

	/**
	 * Log a warning to file
	 *
	 * @param string warning message to be logged
	 */
	public function warn($msg) {
		$this->dolog("WARN", $msg);
		$this->messages[] = array("Severity"=>"WARN", "Message"=>$msg);
	}

	/**
	 * Log an info message to file
	 *
	 * @param string info message to be logged
	 */
	public function info($msg) {
		$this->dolog("INFO", $msg);
		$this->messages[] = array("Severity"=>"INFO", "Message"=>$msg);
	}

	/**
	 * Get the logged messages
	 *
	 * @return array of logged messages. Each entry consists of an array with 'Severity' and 'Message' as key.
	 */
	public function getMessages() {
		return $this->messages;
	}

	/**
	 * Log a message
	 *
	 * @param string severity of the message
	 * @param string log message
	 */
	private function dolog($severity, $msg) {
		if( $this->logfile!=NULL ) {
			if( ($fp = @fopen($this->logfile, "a"))!==false ) {
				fwrite($fp, date("Y-m-d H:i:s")." ".$severity.": ".$msg." (in ".$_SERVER['REQUEST_URI']." requested from ".$_SERVER['REMOTE_ADDR']." by '".(isset($_SESSION['sess_uid'])?$_SESSION['sess_uid']:"*anonymous*")."')\n");
				fclose($fp);
			}else {
				$this->messages[] = array("Severity"=>"ERROR", "Message"=>"Failed opening log file: ".$this->logfile);
			}
		}
	}
	
	/**
	 * Log a message in the database (visible in admin pages)
	 * 
	 * @param string section where the log event is generated
	 * @param string message that should be logged
	 * @param string type of the message (debug|info|warning|error)
	 */
	public function eventLog($section, $message, $type="info") {
		if( isset($GLOBALS['sql']) ) {
			$query = "INSERT INTO `eventlog` SET ";
			if( defined("EVENT_ID") ) {
				$query .= "`event_id`=".$GLOBALS['sql']->escape(EVENT_ID).", ";
			}
			$query .= "`date`='".$GLOBALS['sql']->escape(date("Y-m-d H:i:s"))."', ";
			$query .= "`section`='".$GLOBALS['sql']->escape($section)."', ";
			$query .= "`message`='".$GLOBALS['sql']->escape($message)."', ";
			$query .= "`type`='".$GLOBALS['sql']->escape($type)."', ";
			$query .= "`sess_name`='".$GLOBALS['sql']->escape(isset($_SESSION['sess_name'])?$_SESSION['sess_name']:"anonymous")."';";
			if( !$GLOBALS['sql']->query($query) || !($GLOBALS['sql']->getInsertId()>0) ) {
				$this->error("Failed writing message to eventlog. MySQL error: ".$GLOBALS['sql']->getErrorMsg());
				$this->error("- Section: ".$section."; type: ".$type."; message: ".$message);
				$this->error("- query: ".$query);
			}
		}else {
			$this->warn("Trying to write a message to eventlog, but missing SQL connection. Section: ".$section."; type: ".$type."; message: ".$message);
		}
	}
}
?>