<?php

namespace Middlewares;

use Firebase\JWT\JWT;
use Firebase\JWT\Key;
use Libs\Database;
use Libs\Logger;
use Libs\Payload;
use Psr\Http\Message\ServerRequestInterface;

class JwtAuthMiddleware
{
    private string $jwtSecret;

    public function __construct()
    {
        // Sem fallback: a chave precisa estar configurada no ambiente.
        $this->jwtSecret = $_ENV['JWT_SECRET'] ?? '';
    }

    public function __invoke(ServerRequestInterface $request, callable $next)
    {
        if ($this->jwtSecret === '') {
            // Configuração ausente é erro de servidor, não de autenticação.
            Logger::error('JWT_SECRET is not configured; rejecting authenticated request');
            return Payload::fail('Internal server error', [], 'E_GENERIC', 500);
        }

        $authHeader = $request->getHeaderLine('Authorization');
        if (empty($authHeader) || !preg_match('/Bearer\s+(.*)/', $authHeader, $matches)) {
            return Payload::fail('Unauthorized', [], 'E_VALIDATE', 401);
        }

        $token = $matches[1];

        try {
            $decoded = JWT::decode($token, new Key($this->jwtSecret, 'HS256'));
            $userId = $decoded->sub ?? null;
            $userEmail = $decoded->email ?? $decoded->username ?? null;

            if (empty($userId) || empty($userEmail)) {
                return Payload::fail('Unauthorized', [], 'E_VALIDATE', 401);
            }

            $pdo = Database::pdo();

            $stmt = $pdo->prepare("SELECT user_id, user_email FROM \"user\" WHERE user_id = :user_id AND user_email = :user_email AND user_deleted_at = 'infinity'");
            $stmt->execute(['user_id' => $userId, 'user_email' => mb_strtolower(trim($userEmail))]);
            $user = $stmt->fetch(\PDO::FETCH_ASSOC);

            if (!$user) {
                return Payload::fail('Unauthorized', [], 'E_VALIDATE', 401);
            }

            $request = $request
                ->withAttribute('api_user', $user['user_email'])
                ->withAttribute('api_user_id', $user['user_id'])
                ->withAttribute('user_email', $user['user_email'])
                ->withAttribute('user_id', $user['user_id']);

            return $next($request);

        } catch (\Exception $e) {
            // Detalhe do erro vai só para o log; cliente recebe mensagem genérica.
            Logger::warning('JWT authentication failed', ['error' => $e->getMessage()]);
            return Payload::fail('Unauthorized', [], 'E_VALIDATE', 401);
        }
    }
}