<?php
 /**
  * Simple logger 
  *
  **/     
class PHPLogger{
    /**
     * log_file - the log file to write to
     *  
     * @var string
     **/        
    private $log_file;
    
    /**
     * Constructor
     * @param String logfile - [optional] Absolute file name/path. Defaults to ubuntu apache log.
     * @return void
     **/        
    function __construct($log_file = "/var/log/apache2/error.log") {
        $this->log_file = $log_file;

        if(!file_exists($log_file)){ //Attempt to create log file                
            touch($log_file);
        }

        //Make sure we'ge got permissions
        if(!(is_writable($log_file) || $this->win_is_writable($log_file))){   
            //Cant write to file,
            throw new Exception("LOGGER ERROR: Can't write to log", 1);
        }
    }
    
    /**
     * d - Log Debug
     * @param String tag - Log Tag
     * @param String message - message to spit out
     * @return void
     **/        
    public function d($tag, $message){
        $this->writeToLog("DEBUG", $tag, $message);
    }

    /**
     * e - Log Error
     * @param String tag - Log Tag
     * @param String message - message to spit out
     * @author 
     **/        
    public function e($tag, $message){
        $this->writeToLog("ERROR", $tag, $message);            
    }

    /**
     * w - Log Warning
     * @param String tag - Log Tag
     * @param String message - message to spit out
     * @author 
     **/        
    public function w($tag, $message){
        $this->writeToLog("WARNING", $tag, $message);            
    }

    /**
     * i - Log Info
     * @param String tag - Log Tag
     * @param String message - message to spit out
     * @return void
     **/        
    public function i($tag, $message){
        $this->writeToLog("INFO", $tag, $message);            
    }

    public function log($message) {            
        $date = date('[Y-m-d H:i:s]');
        $msg = "$date: - $message" . PHP_EOL;
        file_put_contents($this->log_file, $msg, FILE_APPEND);
    }

    /**
     * writeToLog - writes out timestamped message to the log file as 
     * defined by the $log_file class variable.
     *
     * @param String status - "INFO"/"DEBUG"/"ERROR" e.t.c.
     * @param String tag - "Small tag to help find log entries"
     * @param String message - The message you want to output.
     * @return void
     **/        
    private function writeToLog($status, $tag, $message) {            
        $date = date('[Y-m-d H:i:s]');
        $msg = "$date: [$tag][$status] - $message" . PHP_EOL;
        file_put_contents($this->log_file, $msg, FILE_APPEND);
    }

    private function win_is_writable( $path ) {
        /* will work in despite of Windows ACLs bug
         * NOTE: use a trailing slash for folders!!!
         * see http://bugs.php.net/bug.php?id=27609
         * see http://bugs.php.net/bug.php?id=30931
         */
        if ( $path[strlen( $path ) - 1] == '/' ) // recursively return a temporary file path
            return win_is_writable( $path . uniqid( mt_rand() ) . '.tmp');
        else if ( is_dir( $path ) )
            return win_is_writable( $path . '/' . uniqid( mt_rand() ) . '.tmp' );
        
        // check tmp file for read/write capabilities
        $should_delete_tmp_file = !file_exists( $path );
        $f = @fopen( $path, 'a' );
        if ( $f === false )
            return false;
        
        fclose( $f );

        if ( $should_delete_tmp_file )
            unlink( $path );

        return true;
    }        
}
?>
