<?php
namespace SyslogDash;

use PDO;
use PDOException;

class Database
{
    private static ?PDO $instance = null;

    public static function getInstance(): PDO
    {
        if (self::$instance === null) {
            $config = self::getConfig();
            try {
                self::$instance = new PDO(
                    $config['dsn'],
                    $config['username'],
                    $config['password'],
                    [
                        PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
                        PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
                        PDO::ATTR_EMULATE_PREPARES   => false,
                    ]
                );
            } catch (PDOException $e) {
                throw new \RuntimeException('Database verbinding mislukt: ' . $e->getMessage());
            }
        }
        return self::$instance;
    }

    private static function getConfig(): array
    {
        $cfg = require __DIR__ . '/../config.php';
        return $cfg['db'];
    }

    public static function table(): string
    {
        $cfg = require __DIR__ . '/../config.php';
        return $cfg['syslog']['table'] ?? 'SystemEvents';
    }

    public static function getHostToIp(): array
    {
        $cfg = require __DIR__ . '/../config.php';
        return $cfg['syslog']['host_to_ip'] ?? [];
    }

    public static function resolveHostnames(): bool
    {
        $cfg = require __DIR__ . '/../config.php';
        return $cfg['syslog']['resolve_hostnames'] ?? true;
    }
}