<?php
/*
 * Chill is a software for social workers
 *
 * Copyright (C) 2019, Champs Libres Cooperative SCRLFS, <http://www.champs-libres.coop>
 *
 * This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

namespace Chill\MainBundle\CRUD\Routing;

use Symfony\Component\Config\Loader\Loader;
use Symfony\Component\Routing\Route;
use Symfony\Component\Routing\RouteCollection;
use Symfony\Component\HttpFoundation\Request;
use Chill\MainBundle\CRUD\Controller\ApiController;
use Chill\MainBundle\CRUD\Controller\CRUDController;

/**
 * Class CRUDRoutesLoader
 * Load the route for CRUD
 *
 * @package Chill\MainBundle\CRUD\Routing
 */
class CRUDRoutesLoader extends Loader
{
    protected array $crudConfig = [];

    protected array $apiCrudConfig = [];
    
    /**
     * @var bool
     */
    private $isLoaded = false;

    private const ALL_SINGLE_METHODS = [
        Request::METHOD_GET,
        Request::METHOD_POST,
        Request::METHOD_PUT,
        Request::METHOD_DELETE
    ];

    private const ALL_INDEX_METHODS = [ Request::METHOD_GET, Request::METHOD_HEAD ];
    
    /**
     * CRUDRoutesLoader constructor.
     *
     * @param $crudConfig the config from cruds
     * @param $apicrudConfig the config from api_crud
     */
    public function __construct(array $crudConfig, array $apiConfig)
    {
        $this->crudConfig = $crudConfig;
        $this->apiConfig = $apiConfig;
    }
    
    /**
     * @param mixed $resource
     * @param null $type
     * @return bool
     */
    public function supports($resource, $type = null)
    {
        return 'CRUD' === $type;
    }
    
    /**
     * Load routes for CRUD and CRUD Api
     */
    public function load($resource, $type = null): RouteCollection
    {
        if (true === $this->isLoaded) {
            throw new \RuntimeException('Do not add the "CRUD" loader twice');
        }

        $collection = new RouteCollection();
        
        foreach ($this->crudConfig as $crudConfig) {
            $collection->addCollection($this->loadCrudConfig($crudConfig));
        }
        foreach ($this->apiConfig as $crudConfig) {
            $collection->addCollection($this->loadApi($crudConfig));
        }

        return $collection;
    }
    
    /**
     * Load routes for CRUD (without api)
     *
     * @param $crudConfig
     * @return RouteCollection
     */
    protected function loadCrudConfig($crudConfig): RouteCollection
    {
        $collection = new RouteCollection();
        $controller ='cscrud_'.$crudConfig['name'].'_controller';

        foreach ($crudConfig['actions'] as $name => $action) {
            // defaults (controller name)
            $defaults = [
                '_controller' => $controller.':'.($action['controller_action'] ?? $name)
            ];
            
            if ($name === 'index') {
                $path = "{_locale}".$crudConfig['base_path'];
                $route = new Route($path, $defaults);
            } elseif ($name === 'new') {
                $path = "{_locale}".$crudConfig['base_path'].'/'.$name;
                $route = new Route($path, $defaults);
            } else {
                $path = "{_locale}".$crudConfig['base_path'].($action['path'] ?? '/{id}/'.$name);
                $requirements = $action['requirements'] ?? [
                    '{id}' => '\d+'
                ];
                $route = new Route($path, $defaults, $requirements);
            }
            
            $collection->add('chill_crud_'.$crudConfig['name'].'_'.$name, $route);
        }
        
        return $collection;
    }

    /**
     * Load routes for api single
     *
     * @param $crudConfig
     * @return RouteCollection
     */
    protected function loadApi(array $crudConfig): RouteCollection
    {
        $collection = new RouteCollection();
        $controller = 'csapi_'.$crudConfig['name'].'_controller';

        foreach ($crudConfig['actions'] as $name => $action) {
            // filter only on single actions
            $singleCollection = $action['single_collection'] ?? $name === '_entity' ? 'single' : NULL;
            if ('collection' === $singleCollection) {
//                continue;
            }

            // compute default action
            switch ($name) {
                case '_entity':
                    $controllerAction = 'entityApi';
                    break;
                case '_index':
                    $controllerAction = 'indexApi';
                    break;
                default:
                    $controllerAction = $name.'Api';
                    break;
            }

            $defaults = [
                '_controller' => $controller.':'.($action['controller_action'] ?? $controllerAction)
            ];

            // path are rewritten
            // if name === 'default', we rewrite it to nothing :-)
            $localName = \in_array($name, [ '_entity', '_index' ]) ? '' : '/'.$name;
            if ('collection' === $action['single_collection'] || '_index' === $name) {
                $localPath = $action['path'] ?? $localName.'.{_format}';
            } else {
                $localPath = $action['path'] ?? '/{id}'.$localName.'.{_format}';
            }
            $path = $crudConfig['base_path'].$localPath;

            $requirements = $action['requirements'] ?? [ '{id}' => '\d+' ];

            $methods = \array_keys(\array_filter($action['methods'], function($value, $key) { return $value; },
                ARRAY_FILTER_USE_BOTH));

            if (count($methods) === 0) {
                throw new \RuntimeException("The api configuration named \"{$crudConfig['name']}\", action \"{$name}\", ".
                    "does not have any allowed methods. You should remove this action from the config ".
                    "or allow, at least, one method"); 
            }

            if ('_entity' === $name && \in_array(Request::METHOD_POST, $methods)) {
                unset($methods[\array_search(Request::METHOD_POST, $methods)]);
                $entityPostRoute = $this->createEntityPostRoute($name, $crudConfig, $action, 
                    $controller);
                $collection->add("chill_api_single_{$crudConfig['name']}_{$name}_create", 
                    $entityPostRoute);
            }

            if (count($methods) === 0) {
                // the only method was POST,
                // continue to next
                continue;
            }

            $route = new Route($path, $defaults, $requirements);
            $route->setMethods($methods);
            
            $collection->add('chill_api_single_'.$crudConfig['name'].'_'.$name, $route);
        }

        return $collection;
    }

    private function createEntityPostRoute(string $name, $crudConfig, array $action, $controller): Route
    {
        $localPath = $action['path'].'.{_format}';
        $defaults = [
            '_controller' => $controller.':'.($action['controller_action'] ?? 'entityPost')
        ];
        $path = $crudConfig['base_path'].$localPath;
        $requirements = $action['requirements'] ?? [];
        $route = new Route($path, $defaults, $requirements);
        $route->setMethods([ Request::METHOD_POST ]);

        return $route;
    }
}