<?php
/**
 * @author Daniel J. Summers <daniel@bitbadger.solutions>
 * @license MIT
 */

declare(strict_types=1);

namespace BitBadger\PDODocument;

/**
 * The mode for queries generated by the library
 */
enum Mode
{
    /** Storing documents in a PostgreSQL database */
    case PgSQL;

    /** Storing documents in a SQLite database */
    case SQLite;

    /**
     * Derive the mode from the Data Source Name (DSN)
     *
     * @return Mode The database mode based on the DSN
     * @throws DocumentException If the DSN does not start with `pgsql:` or `sqlite:`
     */
    public static function deriveFromDSN(string $dsn): Mode
    {
        return match (true) {
            str_starts_with($dsn, 'pgsql:')  => Mode::PgSQL,
            str_starts_with($dsn, 'sqlite:') => Mode::SQLite,
            default => throw new DocumentException('This library currently supports PostgreSQL and SQLite'),
        };
    }
}