<?php
declare(strict_types=1);

/**
 * CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
 * Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
 *
 * Licensed under The MIT License
 * For full copyright and license information, please see the LICENSE.txt
 * Redistributions of files must retain the above copyright notice.
 *
 * @copyright     Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
 * @link          https://cakephp.org CakePHP(tm) Project
 * @since         3.3.0
 * @license       https://opensource.org/licenses/mit-license.php MIT License
 */
namespace Cake\Routing\Middleware;

use Cake\Core\ContainerApplicationInterface;
use Cake\Core\PluginApplicationInterface;
use Cake\Http\Exception\RedirectException;
use Cake\Http\MiddlewareQueue;
use Cake\Http\Runner;
use Cake\Http\ServerRequest;
use Cake\Routing\Router;
use Cake\Routing\RoutingApplicationInterface;
use Laminas\Diactoros\Response\RedirectResponse;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\MiddlewareInterface;
use Psr\Http\Server\RequestHandlerInterface;

/**
 * Applies routing rules to the request and creates the controller
 * instance if possible.
 */
class RoutingMiddleware implements MiddlewareInterface
{
    /**
     * Key used to store the route collection in the cache engine
     *
     * @var string
     */
    public const ROUTE_COLLECTION_CACHE_KEY = 'routeCollection';

    /**
     * The application that will have its routing hook invoked.
     *
     * @var \Cake\Routing\RoutingApplicationInterface
     */
    protected RoutingApplicationInterface $app;

    /**
     * Constructor
     *
     * @param \Cake\Routing\RoutingApplicationInterface $app The application instance that routes are defined on.
     */
    public function __construct(RoutingApplicationInterface $app)
    {
        $this->app = $app;
    }

    /**
     * Trigger the application's and plugin's routes() hook.
     *
     * @return void
     */
    protected function loadRoutes(): void
    {
        $builder = Router::createRouteBuilder('/');
        $this->app->routes($builder);
        if ($this->app instanceof PluginApplicationInterface) {
            $this->app->pluginRoutes($builder);
        }
    }

    /**
     * Apply routing and update the request.
     *
     * Any route/path specific middleware will be wrapped around $next and then the new middleware stack will be
     * invoked.
     *
     * @param \Psr\Http\Message\ServerRequestInterface $request The request.
     * @param \Psr\Http\Server\RequestHandlerInterface $handler The request handler.
     * @return \Psr\Http\Message\ResponseInterface A response.
     */
    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
    {
        $this->loadRoutes();
        try {
            assert($request instanceof ServerRequest);
            Router::setRequest($request);
            $params = (array)$request->getAttribute('params', []);
            $middleware = [];
            if (empty($params['controller'])) {
                $params = Router::parseRequest($request) + $params;
                if (isset($params['_middleware'])) {
                    $middleware = $params['_middleware'];
                }
                $route = $params['_route'];
                unset($params['_middleware'], $params['_route']);

                $request = $request->withAttribute('route', $route);
                $request = $request->withAttribute('params', $params);

                assert($request instanceof ServerRequest);
                Router::setRequest($request);
            }
        } catch (RedirectException $e) {
            return new RedirectResponse(
                $e->getMessage(),
                $e->getCode(),
                $e->getHeaders(),
            );
        }
        $matching = Router::getRouteCollection()->getMiddleware($middleware);
        if (!$matching) {
            return $handler->handle($request);
        }

        $container = $this->app instanceof ContainerApplicationInterface
            ? $this->app->getContainer()
            : null;
        $middleware = new MiddlewareQueue($matching, $container);
        $runner = new Runner();

        return $runner->run($middleware, $request, $handler);
    }
}
