<?php

class Logger
{
    const INFO    = 'INFO';
    const WARNING = 'WARNING';
    const ERROR   = 'ERROR';

    private string $logDir;
    private string $context;

    public function __construct(string $context = 'app')
    {
        $this->logDir  = __DIR__ . '/../../storage/logs';
        $this->context = $context;

        if (!is_dir($this->logDir)) {
            mkdir($this->logDir, 0755, true);
        }
    }

    public function info(string $message, array $extra = []): void
    {
        $this->write(self::INFO, $message, $extra);
    }

    public function warning(string $message, array $extra = []): void
    {
        $this->write(self::WARNING, $message, $extra);
    }

    public function error(string $message, array $extra = []): void
    {
        $this->write(self::ERROR, $message, $extra);
    }

    private function write(string $level, string $message, array $extra = []): void
    {
        $date     = date('Y-m-d');
        $file     = "{$this->logDir}/{$date}.log";
        $time     = date('Y-m-d H:i:s');
        $ip       = $this->getClientIp();
        $extraStr = empty($extra) ? '' : ' ' . json_encode($extra, JSON_UNESCAPED_UNICODE);

        $line = "[{$time}] [{$level}] [{$this->context}] [{$ip}] {$message}{$extraStr}" . PHP_EOL;

        file_put_contents($file, $line, FILE_APPEND | LOCK_EX);
    }

    private function getClientIp(): string
    {
        foreach (['HTTP_X_FORWARDED_FOR', 'HTTP_X_REAL_IP', 'REMOTE_ADDR'] as $key) {
            if (!empty($_SERVER[$key])) {
                $ip = trim(explode(',', $_SERVER[$key])[0]);
                if (filter_var($ip, FILTER_VALIDATE_IP)) {
                    return $ip;
                }
            }
        }
        return 'unknown';
    }

    public static function cleanOldLogs(int $keepDays = 30): void
    {
        $logDir = __DIR__ . '/../../storage/logs';
        if (!is_dir($logDir)) {
            return;
        }

        foreach (glob("{$logDir}/*.log") as $file) {
            if (filemtime($file) < time() - ($keepDays * 86400)) {
                unlink($file);
            }
        }
    }
}