<?php

namespace BSR\Lib;

class Logger {
    const QUIET = 0;
    const NORMAL = 1;
    const VERBOSE = 2;

    private static $start;
    private static $data = array();
    private static $log = '';

    private static function ip() {
        if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
            return array_shift(
                array_map('trim', explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']))
            );
        } else if (isset($_SERVER['REMOTE_ADDR'])) {
            return $_SERVER['REMOTE_ADDR'];
        }

        return '(n-a)';
    }

    public static function start() {
        self::$start = microtime(true);

        self::$data = array(
            'ip' => self::ip(),
            'date' => date('d.m.Y H:m:s'),
            'func' => '(none)',
            'error' => ''
        );
    }

    public static function info($info, $key = null) {
        if(is_null($key)) {
            self::$data = array_merge(self::$data, $info);
        } else {
            self::$data[$key] = $info;
        }
    }

    /**
     * Log a message that will be displayed in the logs if the configuration
     * says so.
     *
     * @param string $message
     * @param int $verbosity
     */
    public static function log($message, $verbosity = Logger::VERBOSE) {
        if(Configuration::get('log.verbosity') < $verbosity) {
            return;
        }

        self::$log .= $message."\n";
    }

    public static function stop($data = null) {
        if(! is_null($data)) {
            self::info($data);
        }

        if(Configuration::get('log.verbosity') > Logger::QUIET) {
            $time = (microtime(true) - self::$start) * 1000;
            self::$data['time'] = round($time, 2).'ms';

            $format = Configuration::get('log.format');

            $patterns = array_map(function($p) { return "%$p%"; }, array_keys(self::$data));
            $msg = str_replace($patterns, array_values(self::$data), $format)."\n";

            if(strlen(self::$log) > 0) {
                $msg .= self::$log;
            }

            file_put_contents(Configuration::get('log.file'), $msg, FILE_APPEND | LOCK_EX);
        }
    }
}