<?php

declare(strict_types=1);

final class Database
{
    private static ?PDO $pdo = null;

    public static function connect(): PDO
    {
        if (self::$pdo !== null) {
            return self::$pdo;
        }

        $root = dirname(__DIR__);
        $dsn  = 'sqlite:' . $root . '/database/api_tube.sqlite';

        self::$pdo = new PDO($dsn);
        self::$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        self::$pdo->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
        self::$pdo->exec('PRAGMA foreign_keys = ON');

        $schema = file_get_contents($root . '/database/schema.sql');
        self::$pdo->exec($schema);

        return self::$pdo;
    }
}