<?php

declare(strict_types=1);

namespace App\Infrastructure;

use PDO;
use PDOException;
use RuntimeException;

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

    public static function get(): PDO
    {
        if (self::$pdo instanceof PDO) {
            return self::$pdo;
        }

        $get = static function (string $k, ?string $default = null): ?string {
            $v = getenv($k);
            if ($v !== false && $v !== '') {
                return (string)$v;
            }
            return $_ENV[$k] ?? $default;
        };

        $dsn  = $get('DB_DSN');
        $user = $get('DB_USER');
        $pass = $get('DB_PASS');

        if (!$dsn) {
            $host = $get('DB_HOST', 'localhost');
            $port = $get('DB_PORT', '5432');
            $name = $get('DB_NAME');
            if ($name) {
                $dsn = sprintf('pgsql:host=%s;port=%s;dbname=%s', $host, $port, $name);
            }
        }

        if (!$dsn) {
            throw new RuntimeException('DB_DSN manquant (ni DB_DSN ni DB_HOST/DB_PORT/DB_NAME).');
        }

        try {
            $pdo = new PDO($dsn, (string)($user ?? ''), (string)($pass ?? ''), [
                PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
                PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
                PDO::ATTR_EMULATE_PREPARES   => false,
            ]);
            return self::$pdo = $pdo;
        } catch (PDOException $e) {
            throw new RuntimeException('Connexion BDD échouée.', previous: $e);
        }
    }

    /** @deprecated Utiliser Database::get() */
    public static function pdo(): PDO
    {
        @trigger_error(__METHOD__.' est déprécié. Utiliser Database::get()', E_USER_DEPRECATED);
        return self::get();
    }

    /** @deprecated Utiliser Database::get() */
    public static function getPdo(): PDO
    {
        @trigger_error(__METHOD__.' est déprécié. Utiliser Database::get()', E_USER_DEPRECATED);
        return self::get();
    }

    /** @deprecated Utiliser Database::get() */
    public static function getInstance(): PDO
    {
        @trigger_error(__METHOD__.' est déprécié. Utiliser Database::get()', E_USER_DEPRECATED);
        return self::get();
    }

    public static function transactional(callable $fn)
    {
        $pdo = self::get();
        try {
            $pdo->beginTransaction();
            $ret = $fn($pdo);
            $pdo->commit();
            return $ret;
        } catch (\Throwable $e) {
            if ($pdo->inTransaction()) {
                $pdo->rollBack();
            }
            throw $e;
        }
    }
}