<?php

/** Logger class
 *
 * @author Laurent Giovannoni <dev@maarch.org>
 **/

class Logger4Php
{

    /**
     * Array of errors levels
     *
     * @protected
     **/
    protected $error_levels = array('DEBUG' => 0, 'INFO' => 1, 'NOTICE' => 2, 'WARNING' => 3, 'ERROR' => 4);

    /**
     * Maps each handler with its log threshold.
     *
     * @protected
     **/
    protected $mapping;

    /**
     * Minimum log level
     *
     * @protected
     **/
    protected $threshold_level;

    /**
     * Path to log4Php library
     *
     * @protected
     **/
    protected $log4PhpLibrary;

	/**
     * Name of the logger
     *
     * @protected
     **/
    protected $log4PhpLogger;

    /**
     * Name of the business code
     *
     * @protected
     **/
    protected $log4PhpBusinessCode;

    /**
     * Path of the param of log4php
     *
     * @protected
     **/
    protected $log4PhpConfigPath;

    /**
     * Name of the batch
     *
     * @protected
     **/
    protected $log4PhpBatchName;

    /** Class constructor
     *
     * Inits the threshold level
     *
     * @param $threshold_level (string) Threshold level (set to 'INFO' by default)
     **/
    function __construct($threshold_level = 'WARNING')
    {
        $this->threshold_level = $threshold_level;
        $this->mapping = array_fill(0, count($this->error_levels), array());
    }

    /** Writes error message in current handlers
     *
     * writes only if the error level is greater or equal the threshold level
     *
     * @param $msg (string) Error message
     * @param $error_level (string) Error level (set to 'INFO' by default)
     * @param $error_code (integer) Error code (set to 0 by default)
     **/
    public function write($msg, $error_level = 'INFO', $error_code = 0, $other_params = array())
    {
		if (!array_key_exists($error_level, $this->error_levels)) {
			$error_level = 'INFO';
		}
		$foundLogger = false;
		if ($this->error_levels[$error_level] >= $this->error_levels[$this->threshold_level]) {
			for ($i=$this->error_levels[$error_level];$i>=0;$i--) {
				foreach ($this->mapping[$i] as $handler) {
					$handler->write($msg, $error_level, $error_code, $other_params);
					if (
						get_class($handler) == 'FileHandler'
						&& (isset($this->log4PhpLibrary)
						&& !empty($this->log4PhpLibrary))
					) {
						if ($error_code == 0) {
							$result = 'OK';
						} else {
							$result = 'KO';
							$msg = '%error_code:' . $error_code . '% ' . $msg;
						}
						require_once($this->log4PhpLibrary);
						$remote_ip = '127.0.0.1';
						Logger::configure($this->log4PhpConfigPath);
						$logger = Logger::getLogger($this->log4PhpLogger);
						$searchPatterns = array('%ACCESS_METHOD%',
							'%RESULT%',
							'%BUSINESS_CODE%',
							'%HOW%',
							'%WHAT%',
							'%REMOTE_IP%',
							'%BATCH_NAME%'
						);
						$replacePatterns = array('Script',
							$result,
							$this->log4PhpBusinessCode,
							'UP',
							$msg,
							$remote_ip,
							$this->log4PhpBatchName
						);
						$logLine = str_replace($searchPatterns,
							$replacePatterns,
							'[%ACCESS_METHOD%][%RESULT%]'
							. '[%BUSINESS_CODE%][%HOW%][%WHAT%][%BATCH_NAME%]'
						);
						$this->writeLog4php($logger, $logLine, $error_level);
					}
				}
			}
		}
    }

	/**
	 *
	 * write a log entry with a specific log level
	 * @param object $logger Log4php logger
	 * @param string $logLine Line we want to trace
	 * @param enum $level Log level
	 */
	function writeLog4php($logger, $logLine, $level) {
		switch ($level) {
			case 'DEBUG':
				$logger->debug($logLine);
				break;
			case 'INFO':
				$logger->info($logLine);
				break;
			case 'WARNING':
				$logger->warn($logLine);
				break;
			case 'ERROR':
				$logger->error($logLine);
				break;
			case 'FATAL':
				$logger->fatal($logLine);
				break;
		}
	}

    /** Adds a new handler in the current handlers array
     *
     * @param $handler (object) Handler object
     **/
    public function add_handler(&$handler, $error_level = NULL)
    {
        if(!isset($handler))
            return false;

        if(!isset($error_level) || !array_key_exists($error_level, $this->error_levels))
        {
            $error_level = $this->threshold_level;
        }

        $this->mapping[$this->error_levels[$error_level]][] = $handler;
        return true;
    }

    /** Adds a new handler in the current handlers array
     *
     * @param $handler (object) Handler object
     **/
    public function change_handler_log_level(&$handler, $log_level )
    {
        if (!isset($handler) || !isset($log_level))
            return false;

        if (!array_key_exists($log_level, $this->error_levels)) {
           return false;
        }

        for ($i=0; $i<count($this->mapping);$i++) {
            for($j=0;$j<count($this->mapping[$i]);$j++) {
                if($handler == $this->mapping[$i][$j]) {
                    unset($this->mapping[$i][$j]);
                }
            }
        }
        $this->mapping = array_values($this->mapping);
        $this->mapping[$this->error_levels[$log_level]][] = $handler;
        return true;
    }

	/** Sets treshold level
     *
     * @param $treshold (string) treshold level
     **/
    public function set_threshold_level($treshold)
    {
        if (isset($treshold) && array_key_exists($treshold, $this->error_levels)) {
            $this->threshold_level = $treshold;
            return true;
        }
        $this->threshold_level = 'WARNING';
        return false;
    }

	/** Sets log4Php library path
     *
     * @param $log4PhpLibrary (string) path
     **/
    public function set_log4PhpLibrary($log4PhpLibrary)
    {
        if (isset($log4PhpLibrary) && !empty($log4PhpLibrary)) {
            if (file_exists($log4PhpLibrary)) {
				$this->log4PhpLibrary = $log4PhpLibrary;
				return true;
			} else {
				return false;
			}
        }
        return false;
    }

    /** Sets log4php logger name
     *
     * @param $log4PhpLogger (string) logger name
     **/
    public function set_log4PhpLogger($log4PhpLogger)
    {
        if (isset($log4PhpLogger) && !empty($log4PhpLogger)) {
            $this->log4PhpLogger = $log4PhpLogger;
            return true;
        }
        $this->log4PhpLogger = 'loggerTechnique';
        return false;
    }

	/** Sets log4php path to log4php xml config
     *
     * @param $log4PhpPath (string) path to log4php xml config
     **/
    public function set_log4PhpConfigPath($log4PhpConfigPath)
    {
        if (isset($log4PhpConfigPath) && !empty($log4PhpConfigPath)) {
            if (file_exists($log4PhpConfigPath)) {
				$this->log4PhpConfigPath = $log4PhpConfigPath;
				return true;
			} else {
				return false;
			}
        }
        return false;
    }

	/** Sets log4php business code
     *
     * @param $log4PhpBusinessCode (string) business code
     **/
    public function set_log4PhpBusinessCode($log4PhpBusinessCode)
    {
        if (isset($log4PhpBusinessCode) && !empty($log4PhpBusinessCode)) {
			$this->log4PhpBusinessCode = $log4PhpBusinessCode;
			return true;
        }
        $this->log4PhpBusinessCode = 'Maarch';
        return false;
    }

    /** Sets log4php batch name
     *
     * @param $log4PhpBatchName (string) BatchName
     **/
    public function set_log4PhpBatchName($log4PhpBatchName)
    {
        if (isset($log4PhpBatchName) && !empty($log4PhpBatchName)) {
			$this->log4PhpBatchName = $log4PhpBatchName;
			return true;
        }
        $this->log4PhpBatchName = 'MaarchBatch';
        return false;
    }

    /** Class destructor
     *
     * Calls handlers destructors
     **/
    function __destruct()
    {
        for($i=0; $i<count($this->mapping);$i++)
        {
            foreach($this->mapping[$i] as $handler)
            {
                unset($handler);
            }
        }
    }
}