<?php

namespace Middlewares;

use Libs\ResponseLib;
use Models\ApplicationModel;
use Psr\Http\Message\ServerRequestInterface;
use Middlewares\JwtAuthMiddleware;
use Middlewares\HmacAuthMiddleware;
use Middlewares\ExternalJwtAuthMiddleware;

class ExternalAuthMiddleware
{
    private ApplicationModel $apps;
    private string $appIdHeader;

    public function __construct()
    {
        $this->apps = new ApplicationModel();
        $this->appIdHeader = $_ENV['APP_ID_HEADER'] ?? 'x-app-id';
    }

    public function __invoke(ServerRequestInterface $request, callable $next)
    {
        // 1) Discover application by ID header (or default)
        $idHeaderVal = $request->getHeaderLine($this->appIdHeader);
        $id = $idHeaderVal !== '' ? (int)$idHeaderVal : (int)($_ENV['DEFAULT_APPLICATION_ID'] ?? 0);
        if ($id <= 0) {
            return ResponseLib::sendFail('Unauthorized: Missing application id', [], 'E_VALIDATE')->withStatus(401);
        }

        $app = $this->apps->getById($id);
        if (!$app) {
            return ResponseLib::sendFail('Unauthorized: Application not found', [], 'E_VALIDATE')->withStatus(401);
        }
        // must be active
        if (($app['aplication_flag'] ?? '') !== 'a') {
            return ResponseLib::sendFail('Unauthorized: Inactive application', [], 'E_VALIDATE')->withStatus(401);
        }

        $method = strtolower($app['aplication_auth_method'] ?? 'external_jwt');
        
        // 2) Route based on method
        if ($method === 'jwt') {
            $jwt = new JwtAuthMiddleware();
            return $jwt($request, $next);
        }
        if ($method === 'hmac') {
            $hmac = new HmacAuthMiddleware();
            return $hmac($request, $next);
        }

        // Default: external_jwt
        if (empty($app['aplication_url'])) {
            return ResponseLib::sendFail('Unauthorized: Application URL not configured for external auth', [], 'E_VALIDATE')->withStatus(401);
        }
        $external = new ExternalJwtAuthMiddleware($app['aplication_url']);
        return $external($request, $next);
    }
}