<?php
declare(strict_types=1);

namespace Modules\FxRates\Infrastructure;

use App\PdoFactory;
use RuntimeException;
use PDO;

final class ConnectionFactory
{
    public static function make(SettingsStore $settingsStore): PDO
    {
        $settings = $settingsStore->load();
        $useSeparateDb = !empty($settings['use_separate_db']);

        if ($useSeparateDb) {
            $dbConfig = is_array($settings['db'] ?? null) ? $settings['db'] : [];
            if ($dbConfig === []) {
                throw new RuntimeException('Custom-Datenbank ist aktiviert, aber nicht vollstaendig konfiguriert.');
            }
            self::assertSupportedDriver($dbConfig);
            return PdoFactory::createFromArray($dbConfig);
        }

        $dbConfig = app()->config()->dbConfig;
        if ($dbConfig === []) {
            throw new RuntimeException('Projekt-Datenbankkonfiguration fehlt in config/db_settings_basic.php.');
        }

        self::assertSupportedDriver($dbConfig);
        return PdoFactory::createFromArray($dbConfig);
    }

    private static function assertSupportedDriver(array $dbConfig): void
    {
        $driver = strtolower((string) ($dbConfig['driver'] ?? ($dbConfig['dsn'] ?? '')));
        if ($driver !== '' && !in_array($driver, ['mysql', 'pgsql', 'sqlite'], true) && !str_starts_with($driver, 'mysql:') && !str_starts_with($driver, 'pgsql:') && !str_starts_with($driver, 'sqlite:')) {
            throw new RuntimeException('FX-Rates unterstuetzt aktuell MySQL/MariaDB, PostgreSQL und SQLite.');
        }
    }
}