<?php

/**
 * webtrees: online genealogy
 * Copyright (C) 2020 webtrees development team
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

declare(strict_types=1);

namespace Fisharebest\Webtrees\Http\Middleware;

use Aura\Router\RouterContainer;
use Fisharebest\Webtrees\Services\ModuleService;
use Fisharebest\Webtrees\Services\TreeService;
use Fisharebest\Webtrees\Tree;
use Middleland\Dispatcher;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\MiddlewareInterface;
use Psr\Http\Server\RequestHandlerInterface;

use function app;
use function array_map;

/**
 * Simple class to help migrate to a third-party routing library.
 */
class Router implements MiddlewareInterface
{
    /** @var ModuleService */
    private $module_service;

    /** @var RouterContainer */
    private $router_container;

    /** @var TreeService */
    private $tree_service;

    /**
     * Router constructor.
     *
     * @param ModuleService   $module_service
     * @param RouterContainer $router_container
     * @param TreeService     $tree_service
     */
    public function __construct(ModuleService $module_service, RouterContainer $router_container, TreeService $tree_service)
    {
        $this->module_service   = $module_service;
        $this->router_container = $router_container;
        $this->tree_service     = $tree_service;
    }

    /**
     * @param ServerRequestInterface  $request
     * @param RequestHandlerInterface $handler
     *
     * @return ResponseInterface
     */
    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
    {
        // Turn the ugly URL into a pretty one, so the router can parse it.
        $pretty = $request;

        if ($request->getAttribute('rewrite_urls') !== '1') {
            // Ugly URLs store the path in a query parameter.
            $url_route = $request->getQueryParams()['route'] ?? '';
            $uri       = $request->getUri()->withPath($url_route);
            $pretty    = $request->withUri($uri);
        }

        // Match the request to a route.
        $route = $this->router_container->getMatcher()->match($pretty);

        // No route matched? Let the default handler take care of it
        if ($route === false) {
            return $handler->handle($request);
        }

        // Add the route as attribute of the request
        $request = $request->withAttribute('route', $route);

        // This middleware cannot run until after the routing, as it needs to know the route.
        $post_routing_middleware = [CheckCsrf::class];
        $post_routing_middleware = array_map('app', $post_routing_middleware);

        // Firstly, apply the route middleware
        $route_middleware = $route->extras['middleware'] ?? [];
        $route_middleware = array_map('app', $route_middleware);

        // Secondly, apply any module middleware
        $module_middleware = $this->module_service->findByInterface(MiddlewareInterface::class)->all();

        // Finally, run the handler using middleware
        $handler_middleware = [new WrapHandler($route->handler)];

        $middleware = array_merge(
            $post_routing_middleware,
            $route_middleware,
            $module_middleware,
            $handler_middleware
        );

        // Add the matched attributes to the request.
        foreach ($route->attributes as $key => $value) {
            if ($key === 'tree') {
                $value = $this->tree_service->all()->get($value);
                app()->instance(Tree::class, $value);

                // Missing mandatory parameter? Let the default handler take care of it.
                if ($value === null && strpos($route->path, '{tree}') !== false) {
                    return $handler->handle($request);
                }
            }

            $request = $request->withAttribute((string) $key, $value);
        }

        // Bind the request into the container
        app()->instance(ServerRequestInterface::class, $request);

        $dispatcher = new Dispatcher($middleware, app());

        return $dispatcher->dispatch($request);
    }
}