<?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\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Doctrine\ORM\QueryBuilder;
use Chill\MainBundle\Pagination\PaginatorFactory;
use Symfony\Component\Form\FormInterface;
use Symfony\Component\Translation\TranslatorInterface;
use Symfony\Component\Form\Extension\Core\Type\SubmitType;
use Chill\MainBundle\Security\Authorization\AuthorizationHelper;
use Symfony\Component\Security\Core\Role\Role;
use Symfony\Component\EventDispatcher\EventDispatcherInterface;
use Chill\MainBundle\CRUD\Resolver\Resolver;
use Chill\MainBundle\Pagination\PaginatorInterface;

/**
 * 
 *
 */
class CRUDController extends AbstractController
{
    /**
     * The crud configuration 
     *
     * This configuration si defined by `chill_main['crud']`.
     *
     * @var array
     */
    protected $crudConfig;

    public function setCrudConfig(array $config)
    {
        $this->crudConfig = $config;
    }
    
    protected function processTemplateParameters($action): array
    {
        throw new Exception('is this method used ?');
        
        $configured = $this->getTemplateParameters($action);
        
        switch($action) {
            case 'index': 
                $default = [
                    'columns' => $this->getDoctrine()->getManager()
                        ->getClassMetadata($this->getEntity())
                        ->getIdentifierFieldNames(),
                    'actions' => ['edit', 'delete']
                ];
                break;
            default:
                throw new \LogicException("this action is not supported: $action");
        }
        
        $result = \array_merge($default, $configured);
        
        // add constants
        $result['class'] = $this->getEntity();
        
        return $result;
    }
    
    protected function orderQuery($action, QueryBuilder $query, Request $request, PaginatorInterface $paginator): QueryBuilder
    {
        return $query;
    }
    
    public function index(Request $request)
    {
        return $this->indexEntityAction('index', $request);
    }
    
    protected function indexEntityAction($action, Request $request)
    {
        $totalItems = $this->countEntities($action, $request);
        $paginator = $this->getPaginatorFactory()->create($totalItems);
        $query = $this->queryEntities($action, $request, $paginator);
        
        $entities = $query->getQuery()->getResult();
        
        $defaultTemplateParameters = [
            'entities'  => $entities,
            'crud_name' => $this->getCrudName(),
            'paginator' => $paginator
        ];
        
        return $this->render(
            $this->getTemplateFor($action, $entities, $request), 
            $this->generateTemplateParameter($action, $entities, $request, $defaultTemplateParameters)
            );
    }
    
    protected function queryEntities($action, Request $request, PaginatorInterface $paginator)
    {
        $query = $this->getDoctrine()->getManager()
            ->createQueryBuilder()
            ->select('e')
            ->from($this->getEntityClass(), 'e')
            ->setFirstResult($paginator->getCurrentPage()->getFirstItemNumber())
            ->setMaxResults($paginator->getItemsPerPage())
            ;
        
        $this->orderQuery($action, $query, $request, $paginator);
        
        return $query;
    }
    
    protected function countEntities($action, Request $request)
    {
        return $this->getDoctrine()->getManager()
            ->createQuery("SELECT COUNT(e) FROM ".$this->getEntityClass()." e")
            ->getSingleScalarResult()
            ;
    }
    
    public function edit(Request $request, $id): Response
    {
        return $this->formEditAction('edit', $request, $id);
    }
    
    public function new(Request $request): Response
    {
        return $this->formCreateAction('new', $request);
    }
    
    public function view(Request $request, $id): Response
    {
        return $this->viewAction('view', $request, $id);
    }
    
    protected function viewAction($action, Request $request, $id) 
    {
        $entity = $this->getEntity($action, $id, $request);
        
        $postFetch = $this->onPostFetchEntity($action, $request, $entity);
        
        if ($postFetch instanceof Response) {
            return $postFetch;
        }
        
        $this->checkACL($action, $entity);
        
        $postCheckACL = $this->onPostCheckACL($action, $request, $entity);
        
        if ($postCheckACL instanceof Response) {
            return $postCheckACL;
        }
        
        $defaultTemplateParameters = [
            'entity' => $entity,
            'crud_name' => $this->getCrudName()
        ];
        
        return $this->render(
            $this->getTemplateFor($action, $entity, $request), 
            $this->generateTemplateParameter($action, $entity, $request, $defaultTemplateParameters)
            );
    }
    
    protected function formEditAction($action, Request $request, $id, $formClass = null, $formOptions = []): Response
    {
        $entity = $this->getEntity($action, $id, $request);
        
        if (NULL === $entity) {
            throw $this->createNotFoundException(sprintf("The %s with id %s "
                . "is not found"), $this->getCrudName(), $id);
        }
        
        $this->checkACL($action, $entity);
        
        $form = $this->createFormFor($action, $entity, $formClass, $formOptions);
        
        $form->handleRequest($request);
        
        if ($form->isSubmitted() && $form->isValid()) {
            $this->onFormValid($entity, $form, $request);
            $em = $this->getDoctrine()->getManager();
            
            $this->onPreFlush($action, $entity, $form, $request);
            $em->flush();
            $this->onPostFlush($action, $entity, $form, $request);
            
            $this->addFlash('success', $this->generateFormSuccessMessage($action, $entity));
            
            $result = $this->onBeforeRedirectAfterSubmission($action, $entity, $form, $request);
            
            if ($result instanceof Response) {
                return $result;
            }
            
            return $this->redirectToRoute('chill_crud_'.$this->getCrudName().'_index');
            
        } elseif ($form->isSubmitted()) {
            $this->addFlash('error', $this->generateFormErrorMessage($action, $form));
        }
        
        $defaultTemplateParameters = [
            'form' => $form->createView(),
            'entity' => $entity,
            'crud_name' => $this->getCrudName()
        ];
        
        return $this->render(
            $this->getTemplateFor($action, $entity, $request), 
            $this->generateTemplateParameter($action, $entity, $request, $defaultTemplateParameters)
            );
    }
    
    protected function formCreateAction($action, Request $request, $formClass = null): Response
    {
        if ($request->query->has('duplicate')) {
            $entity = $this->duplicateEntity($action, $request);
        } else {
            $entity = $this->createEntity($action, $request);
        }
        
        $this->checkACL($action, $entity);
        
        $form = $this->createFormFor($action, $entity, $formClass);
        
        $form->handleRequest($request);
        
        if ($form->isSubmitted() && $form->isValid()) {
            $this->onFormValid($entity, $form, $request);
            $em = $this->getDoctrine()->getManager();
            
            $this->onPrePersist($action, $entity, $form, $request);
            $em->persist($entity);
            $this->onPostPersist($action, $entity, $form, $request);
            
            $this->onPreFlush($action, $entity, $form, $request);
            $em->flush();
            $this->onPostFlush($action, $entity, $form, $request);
            $this->getPaginatorFactory();
            $this->addFlash('success', $this->generateFormSuccessMessage($action, $entity));
            
            $result = $this->onBeforeRedirectAfterSubmission($action, $entity, $form, $request);
            
            if ($result instanceof Response) {
                return $result;
            }
            
            return $this->redirectToRoute('chill_crud_'.$this->getCrudName().'_view', ['id' => $entity->getId()]);
            
        } elseif ($form->isSubmitted()) {
            $this->addFlash('error', $this->generateFormErrorMessage($action, $form));
        }
        
        $defaultTemplateParameters = [
            'form' => $form->createView(),
            'entity' => $entity,
            'crud_name' => $this->getCrudName()
        ];
        
        return $this->render(
            $this->getTemplateFor($action, $entity, $request), 
            $this->generateTemplateParameter($action, $entity, $request, $defaultTemplateParameters)
            );
    }
    
    /**
     * get the instance of the entity with the given id
     * 
     * @param string $id
     * @return object
     */
    protected function getEntity($action, $id, Request $request): ?object
    {
        return $this->getDoctrine()
            ->getRepository($this->getEntityClass())
            ->find($id);
    }
    
    protected function duplicateEntity(string $action, Request $request)
    {
        $id = $request->query->get('duplicate_id', 0);
        $originalEntity = $this->getEntity($action, $id, $request);
        
        $this->getDoctrine()->getManager()
            ->detach($originalEntity);
        
        return $originalEntity;
    }
    
    protected function getEntityClass(): string
    {
        return $this->crudConfig['class'];
    }
    
    protected function getCrudName(): string
    {
        return $this->crudConfig['name'];
    }

    protected function checkACL($action, $entity)
    {
        $this->denyAccessUnlessGranted($this->getRoleFor($action), $entity);
    }
    
    protected function getRoleFor($action)
    {
        if (NULL !== ($this->getActionConfig($action)['role'])) {
            return $this->getActionConfig($action)['role'];
        }
        
        return $this->buildDefaultRole($action);
    }

    protected function buildDefaultRole($action)
    {
        return $this->getCrudResolver()->buildDefaultRole($this->getCrudName(), 
            $action);
    }
    
    protected function getFormClassFor($action)
    {
        return $this->crudConfig[$action]['form_class']
            ?? $this->crudConfig['form_class'];
    }
    
    protected function createFormFor($action, $entity, $formClass = null, $formOptions = [])
    {
        $formClass = $formClass ?? $this->getFormClassFor($action);
        
        $form = $this->createForm($formClass, $entity, $formOptions);
        
        $this->customizeForm($action, $form);
        
        return $form;
    }
    
    protected function customizeForm($action, FormInterface $form)
    {

    }
    
    protected function generateLabelForButton($action, $formName, $form)
    {
        return sprintf("crud.%s.button_action_form", $action);
    }
    
    protected function generateFormErrorMessage($action, FormInterface $form): string
    {
        $msg = 'This form contains errors';
        
        return $this->getTranslator()->trans($msg);
    }
    
    protected function generateFormSuccessMessage($action, $entity): string
    {
        switch ($action) {
            case 'edit':
                $msg = "crud.edit.success";
                break;
            case 'new':
                $msg = "crud.new.success";
                break;
            default:
                $msg = "crud.default.success";
        }
        
        return $this->getTranslator()->trans($msg);
    }
    
    protected function generateTemplateParameter(
        $action, 
        $entity, 
        Request $request, 
        array $defaultTemplateParameters = []
    ) {
        return $defaultTemplateParameters;
    }

    protected function createEntity($action, Request $request): object
    {
        $type = $this->getEntityClass();
        
        return new $type;
    }
    
    /**
     * 
     * @param string $action
     * @param mixed $entity the entity for the current request, or an array of entities
     * @param Request $request
     * @return string
     * @throws \LogicException
     */
    protected function getTemplateFor($action, $entity, Request $request)
    {
        if ($this->hasCustomTemplate($action, $entity, $request)) {
            return $this->getActionConfig($action)['template'];
        }
        
        switch ($action) {
            case 'new':
                return '@ChillMain/CRUD/new.html.twig';
            case 'edit': 
                return '@ChillMain/CRUD/edit.html.twig';
            case 'index':
                return '@ChillMain/CRUD/index.html.twig';
            case 'view':
                return '@ChillMain/CRUD/view.html.twig';
            default:
                throw new \LogicException("the view for action $action is not "
                    . "defined. You should override ".__METHOD__." to add this "
                    . "action");
        }
    }
    
    protected function hasCustomTemplate($action, $entity, Request $request): bool
    {
        return !empty($this->getActionConfig($action)['template']);
    }
    
    protected function onPreFlush(string $action, $entity, FormInterface $form, Request $request)
    {
    }

    protected function onPostFlush(string $action, $entity, FormInterface $form, Request $request)
    {
    }

    protected function onPrePersist(string $action, $entity, FormInterface $form, Request $request)
    {
    }
    
    protected function onPostPersist(string $action, $entity, FormInterface $form, Request $request)
    {
    }
    
    protected function onPostFetchEntity($action, Request $request, $entity): ?Response
    {
        return null;
    }
    
    protected function onPostCheckACL($action, Request $request, $entity): ?Response
    {
        return null;
    }
    
    protected function onFormValid(object $entity, FormInterface $form, Request $request)
    {
    }
    
    protected function onBeforeRedirectAfterSubmission(string $action, $entity, FormInterface $form, Request $request)
    {
        $next = $request->request->get("submit", "save-and-close");
        
        switch ($next) {
            case "save-and-close":
                return $this->redirectToRoute('chill_crud_'.$this->getCrudName().'_index');
            case "save-and-new":
                return $this->redirectToRoute('chill_crud_'.$this->getCrudName().'_new');
            default:
                return $this->redirectToRoute('chill_crud_'.$this->getCrudName().'_view', [
                    'id' => $entity->getId()
                    ]);
        }
    }
    
    protected function getActionConfig(string $action)
    {
        return $this->crudConfig['actions'][$action];
    }

    protected function getPaginatorFactory(): PaginatorFactory
    {
        return $this->get(PaginatorFactory::class);
    }
    
    protected function getTranslator(): TranslatorInterface
    {
        return $this->container->get('translator');
    }
    
    protected function getAuthorizationHelper(): AuthorizationHelper
    {
        return $this->container->get(AuthorizationHelper::class);
    }
    
    protected function getReachableCenters(Role $role, Scope $scope = null) 
    {
        return $this->getAuthorizationHelper()
            ->getReachableCenters($this->getUser(), $role, $scope)
            ;
    }
    
    protected function getEventDispatcher(): EventDispatcherInterface
    {
        return $this->get(EventDispatcherInterface::class);
    }
    
    protected function getCrudResolver(): Resolver
    {
        return $this->get(Resolver::class);
    }
    
    public static function getSubscribedServices()
    {
        return \array_merge(
            parent::getSubscribedServices(),
            [
                PaginatorFactory::class => PaginatorFactory::class,
                'translator' => TranslatorInterface::class,
                AuthorizationHelper::class => AuthorizationHelper::class,
                EventDispatcherInterface::class => EventDispatcherInterface::class,
                Resolver::class => Resolver::class,
            ]
        );
    }
}