<?php

/**
 * 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; under version 2
 * of the License (non-upgradable).
 *
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright (c) 2018 (original work) Open Assessment Technologies SA;
 *
 */

namespace oat\tao\model\routing;

use Psr\Http\Message\ServerRequestInterface;

/**
 * Class AbstractApiRoute
 * Route for RestApi controllers
 * @package oat\tao\model\routing
 * @author Aleh Hutnikau, <hutnikau@1pt.com>
 */
abstract class AbstractApiRoute extends AbstractRoute
{
    /**
     * @param ServerRequestInterface $request
     * @return null|string
     * @throws \ResolverException
     */
    public function resolve(ServerRequestInterface $request)
    {
        $relativeUrl = \tao_helpers_Request::getRelativeUrl($request->getRequestTarget());
        try {
            return $this->getController($relativeUrl) . '@' . $this->getAction($request->getMethod());
        } catch (RouterException $e) {
            return null;
        }
    }

    /**
     * @param $relativeUrl
     * @return string
     * @throws RouterException
     */
    protected function getController($relativeUrl)
    {
        $parts = explode('/', $relativeUrl);
        $prefix = $this->getControllerPrefix();
        if (strpos($relativeUrl, $this->getId()) !== 0) {
            throw new RouterException('Path does not match');
        }

        if (!isset($parts[2])) {
            throw new RouterException('Missed controller name in uri: ' . $relativeUrl);
        }

        if (!class_exists($prefix . ucfirst($parts[2]))) {
            throw new RouterException('Controller ' . $parts[2] . ' does not exists');
        }

        return $prefix . ucfirst($parts[2]);
    }

    /**
     * @param $method
     * @return string
     * @throws RouterException
     */
    protected function getAction($method)
    {
        switch ($method) {
            case 'GET':
                $action = 'get';
                break;
            case 'PUT':
                $action = 'put';
                break;
            case 'POST':
                $action = 'post';
                break;
            case 'DELETE':
                $action = 'delete';
                break;
            default:
                throw new RouterException('Method `' . $method . ' is not supported');
        }

        return $action;
    }
}