<?php

declare(strict_types=1);

function db(): PDO
{
    static $pdo = null;

    if ($pdo instanceof PDO) {
        return $pdo;
    }

    $config = require __DIR__ . '/config.php';
    $dsn = sprintf(
        'mysql:host=%s;port=%s;dbname=%s;charset=utf8mb4',
        $config['db_host'],
        $config['db_port'],
        $config['db_name']
    );

    $pdo = new PDO(
        $dsn,
        $config['db_user'],
        $config['db_pass'],
        [
            PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
            PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
        ]
    );

    return $pdo;
}