<?php
class Logger {
    protected string $logFile;
    protected int $logLevelThreshold;

    const LEVELS = [
        'DEBUG' => 0,
        'INFO' => 1,
        'WARNING' => 2,
        'ERROR' => 3,
        'NONE' => 999
    ];

    public function __construct(string $logFile, string $minLevel = 'DEBUG') {
        $this->logFile = $logFile;
        $minLevel = strtoupper($minLevel);
        $this->logLevelThreshold = self::LEVELS[$minLevel] ?? 0;
    }

    protected function log(string $level, string $message): void {
        $level = strtoupper($level);
        if (!isset(self::LEVELS[$level]) || self::LEVELS[$level] < $this->logLevelThreshold) {
            return;
        }

        $time = date('Y-m-d H:i:s');
        $ip = $_SERVER['REMOTE_ADDR'];
        $logEntry = "[$time] [$ip] [$level] $message" . PHP_EOL;

        file_put_contents($this->logFile, $logEntry, FILE_APPEND | LOCK_EX);
    }

    public function debug(string $msg): void {
        $this->log('DEBUG', $msg);
    }

    public function info(string $msg): void {
        $this->log('INFO', $msg);
    }

    public function warning(string $msg): void {
        $this->log('WARNING', $msg);
    }

    // Alias
    public function warn(string $msg): void {
        $this->log('WARNING', $msg);
    }

    public function error(string $msg): void {
        $this->log('ERROR', $msg);
    }
}