<?php

declare(strict_types=1);

/*
 * Chill is a software for social workers
 *
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 */

namespace Chill\TaskBundle\Controller;

use Chill\MainBundle\Pagination\PaginatorFactory;
use Chill\MainBundle\Security\Resolver\CenterResolverDispatcherInterface;
use Chill\MainBundle\Serializer\Model\Collection;
use Chill\MainBundle\Serializer\Model\Counter;
use Chill\MainBundle\Templating\Listing\FilterOrderHelper;
use Chill\MainBundle\Templating\Listing\FilterOrderHelperFactoryInterface;
use Chill\MainBundle\Timeline\TimelineBuilder;
use Chill\PersonBundle\Entity\AccompanyingPeriod;
use Chill\PersonBundle\Entity\Person;
use Chill\PersonBundle\Privacy\PrivacyEvent;
use Chill\TaskBundle\Entity\SingleTask;
use Chill\TaskBundle\Event\TaskEvent;
use Chill\TaskBundle\Event\UI\UIEvent;
use Chill\TaskBundle\Form\SingleTaskType;
use Chill\TaskBundle\Repository\SingleTaskAclAwareRepositoryInterface;
use Chill\TaskBundle\Security\Authorization\TaskVoter;
use LogicException;
use Psr\Log\LoggerInterface;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\EventDispatcher\EventDispatcherInterface;
use Symfony\Component\Form\Extension\Core\Type\SubmitType;
use Symfony\Component\Form\FormFactoryInterface;
use Symfony\Component\Form\FormInterface;
use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
use Symfony\Component\Routing\Annotation\Route;
use Symfony\Component\Security\Core\Role\Role;
use Symfony\Contracts\Translation\TranslatorInterface;

use function array_map;
use function array_merge;

final class SingleTaskController extends AbstractController
{
    private CenterResolverDispatcherInterface $centerResolverDispatcher;

    private EventDispatcherInterface $eventDispatcher;

    private FilterOrderHelperFactoryInterface $filterOrderHelperFactory;

    private LoggerInterface $logger;

    private PaginatorFactory $paginatorFactory;

    private SingleTaskAclAwareRepositoryInterface $singleTaskAclAwareRepository;

    private TimelineBuilder $timelineBuilder;

    private TranslatorInterface $translator;

    public function __construct(
        CenterResolverDispatcherInterface $centerResolverDispatcher,
        PaginatorFactory $paginatorFactory,
        SingleTaskAclAwareRepositoryInterface $singleTaskAclAwareRepository,
        TranslatorInterface $translator,
        EventDispatcherInterface $eventDispatcher,
        TimelineBuilder $timelineBuilder,
        LoggerInterface $logger,
        FilterOrderHelperFactoryInterface $filterOrderHelperFactory
    ) {
        $this->eventDispatcher = $eventDispatcher;
        $this->timelineBuilder = $timelineBuilder;
        $this->logger = $logger;
        $this->translator = $translator;
        $this->centerResolverDispatcher = $centerResolverDispatcher;
        $this->paginatorFactory = $paginatorFactory;
        $this->singleTaskAclAwareRepository = $singleTaskAclAwareRepository;
        $this->filterOrderHelperFactory = $filterOrderHelperFactory;
    }

    /**
     * @Route(
     *     "/{_locale}/task/single-task/{id}/delete",
     *     name="chill_task_single_task_delete"
     * )
     *
     * @param mixed $id
     */
    public function deleteAction(Request $request, $id)
    {
        $course = null;
        $em = $this->getDoctrine()->getManager();
        $task = $em->getRepository(SingleTask::class)->find($id);

        if (null === $task) {
            throw $this->createNotFoundException('Unable to find Task entity.');
        }

        if ($task->getPerson() !== null) {
            $personId = $task->getPerson()->getId();

            if (null === $personId) {
                return new Response('You must provide a person_id', Response::HTTP_BAD_REQUEST);
            }

            $person = $this->getDoctrine()->getManager()
                ->getRepository(Person::class)
                ->find($personId);

            if (null === $person) {
                throw $this->createNotFoundException('Invalid person id');
            }
        } else {
            $courseId = $task->getCourse()->getId();

            if (null === $courseId) {
                return new Response('You must provide a course_id', Response::HTTP_BAD_REQUEST);
            }

            $course = $this->getDoctrine()->getManager()
                ->getRepository(AccompanyingPeriod::class)
                ->find($courseId);

            if (null === $course) {
                throw $this->createNotFoundException('Invalid accompanying period id');
            }
        }

        // TODO: reactivate right to delete

        // $this->denyAccessUnlessGranted(TaskVoter::DELETE, $task, 'You are not '
        //     . 'allowed to delete this task');

        $form = $this->createDeleteForm($id);

        if ($request->getMethod() === Request::METHOD_DELETE) {
            $form->handleRequest($request);

            if ($form->isValid()) {
                $this->logger->notice('A task has been removed', [
                    'by_user' => $this->getUser()->getUsername(),
                    'task_id' => $task->getId(),
                    'description' => $task->getDescription(),
                    'assignee' => $task->getAssignee(),
                    //    TODO reimplement scope
                    //    'scope_id' => $task->getScope()->getId(),
                ]);

                $em = $this->getDoctrine()->getManager();
                $em->remove($task);
                $em->flush();

                $this->addFlash('success', $this->translator
                    ->trans('The task has been successfully removed.'));

                if ($task->getContext() instanceof Person) {
                    return $this->redirect($this->generateUrl(
                        'chill_task_singletask_by-person_list',
                        ['id' => $task->getPerson()->getId()]
                    ));
                }

                return $this->redirect($this->generateUrl(
                    'chill_task_singletask_by-course_list',
                    ['id' => $task->getCourse()->getId()]
                ));
            }
        }

        if ($task->getContext() instanceof Person) {
            return $this->render(
                '@ChillTask/SingleTask/Person/confirm_delete.html.twig',
                [
                    'task' => $task,
                    'delete_form' => $form->createView(),
                ]
            );
        }

        return $this->render(
            '@ChillTask/SingleTask/AccompanyingCourse/confirm_delete.html.twig',
            [
                'task' => $task,
                'delete_form' => $form->createView(),
                'accompanyingCourse' => $course,
            ]
        );
    }

    /**
     * @Route(
     *     "/{_locale}/task/single-task/{id}/edit",
     *     name="chill_task_single_task_edit"
     * )
     */
    public function editAction(
        SingleTask $task,
        Request $request
    ) {
        $this->denyAccessUnlessGranted(TaskVoter::UPDATE, $task, 'You are not '
            . 'allowed to edit this task');

        $event = (new UIEvent('single-task', $task))
            ->setForm($this->setCreateForm($task, TaskVoter::UPDATE));
        $this->eventDispatcher->dispatch(UIEvent::EDIT_FORM, $event);

        $form = $event->getForm();

        $form->handleRequest($request);

        if ($form->isSubmitted()) {
            if ($form->isValid()) {
                $em = $this->getDoctrine()->getManager();
                $em->persist($task);

                $em->flush();

                $this->addFlash('success', $this->translator
                    ->trans('The task has been updated'));

                if ($task->getContext() instanceof Person) {
                    $event = new PrivacyEvent($task->getPerson(), [
                        'element_class' => SingleTask::class,
                        'element_id' => $task->getId(),
                        'action' => 'update',
                    ]);
                    $this->eventDispatcher->dispatch(PrivacyEvent::PERSON_PRIVACY_EVENT, $event);

                    if ($request->query->has('returnPath')) {
                        return $this->redirect($request->query->get('returnPath'));
                    }

                    return $this->redirectToRoute(
                        'chill_task_singletask_list',
                    );
                }

                if ($request->query->has('returnPath')) {
                    return $this->redirect($request->query->get('returnPath'));
                }

                return $this->redirectToRoute(
                    'chill_task_singletask_by-course_list',
                    ['id' => $task->getCourse()->getId()]
                );
            }
            $this->addFlash('error', $this->translator->trans('This form contains errors'));
        }

        $this->eventDispatcher->dispatch(UIEvent::EDIT_PAGE, $event);

        if ($event->hasResponse()) {
            return $event->getResponse();
        }

        if ($task->getContext() instanceof Person) {
            $event = new PrivacyEvent($task->getPerson(), [
                'element_class' => SingleTask::class,
                'element_id' => $task->getId(),
                'action' => 'edit',
            ]);
            $this->eventDispatcher->dispatch(PrivacyEvent::PERSON_PRIVACY_EVENT, $event);

            return $this->render('@ChillTask/SingleTask/Person/edit.html.twig', [
                'task' => $task,
                'form' => $form->createView(),
            ]);
        }

        return $this->render('@ChillTask/SingleTask/AccompanyingCourse/edit.html.twig', [
            'task' => $task,
            'form' => $form->createView(),
            'accompanyingCourse' => $task->getCourse(),
        ]);
    }

    /**
     * Arguments:
     *  - user_id
     *  - scope_id
     *  - s
     *  - person_id
     *  - hide_form (hide the form to filter the tasks)
     *  - status: date state, amongst SingleTaskRepository::DATE_STATUSES, or 'closed'.
     *
     * @Route(
     *     "/{_locale}/task/single-task/list",
     *     name="chill_task_singletask_list"
     * )
     */
    public function listAction(
        Request $request
    ) {
        $this->denyAccessUnlessGranted(TaskVoter::SHOW, null);

        $filterOrder = $this->buildFilterOrder();

        $flags = array_merge(
            $filterOrder->getCheckboxData('status'),
            array_map(static fn ($i) => 'state_' . $i, $filterOrder->getCheckboxData('states'))
        );
        $nb = $this->singleTaskAclAwareRepository->countByAllViewable(
            $filterOrder->getQueryString(),
            $flags
        );
        $paginator = $this->paginatorFactory->create($nb);

        if (0 < $nb) {
            $tasks = $this->singleTaskAclAwareRepository->findByAllViewable(
                $filterOrder->getQueryString(),
                $flags,
                $paginator->getCurrentPageFirstItemNumber(),
                $paginator->getItemsPerPage(),
                [
                    'startDate' => 'DESC',
                    'endDate' => 'DESC',
                ]
            );
        } else {
            $tasks = [];
        }

        return $this->render('@ChillTask/SingleTask/List/index.html.twig', [
            'tasks' => $tasks,
            'paginator' => $paginator,
            'filter_order' => $filterOrder,
        ]);
    }

    /**
     * @Route(
     *     "/{_locale}/task/single-task/by-course/{id}",
     * name="chill_task_singletask_by-course_list")
     */
    public function listCourseTasks(
        AccompanyingPeriod $course,
        FormFactoryInterface $formFactory,
        Request $request
    ): Response {
        $this->denyAccessUnlessGranted(TaskVoter::SHOW, $course);

        $filterOrder = $this->buildFilterOrder();
        $flags = array_merge(
            $filterOrder->getCheckboxData('status'),
            array_map(static fn ($i) => 'state_' . $i, $filterOrder->getCheckboxData('states'))
        );
        $nb = $this->singleTaskAclAwareRepository->countByCourse(
            $course,
            $filterOrder->getQueryString(),
            $flags
        );
        $paginator = $this->paginatorFactory->create($nb);

        if (0 < $nb) {
            $tasks = $this->singleTaskAclAwareRepository->findByCourse(
                $course,
                $filterOrder->getQueryString(),
                $flags,
                $paginator->getCurrentPageFirstItemNumber(),
                $paginator->getItemsPerPage(),
                [
                    'startDate' => 'DESC',
                    'endDate' => 'DESC',
                ]
            );
        } else {
            $tasks = [];
        }

        return $this->render(
            '@ChillTask/SingleTask/AccompanyingCourse/list.html.twig',
            [
                'tasks' => $tasks,
                'accompanyingCourse' => $course,
                'paginator' => $paginator,
                'filter_order' => $filterOrder,
            ]
        );
    }

    /**
     * @Route(
     *     "/{_locale}/task/single-task/by-person/{id}",
     * name="chill_task_singletask_by-person_list")
     */
    public function listPersonTasks(
        Person $person
    ): Response {
        $this->denyAccessUnlessGranted(TaskVoter::SHOW, $person);

        $filterOrder = $this->buildFilterOrder();
        $flags = array_merge(
            $filterOrder->getCheckboxData('status'),
            array_map(static fn ($i) => 'state_' . $i, $filterOrder->getCheckboxData('states'))
        );
        $nb = $this->singleTaskAclAwareRepository->countByPerson(
            $person,
            $filterOrder->getQueryString(),
            $flags
        );
        $paginator = $this->paginatorFactory->create($nb);

        if (0 < $nb) {
            $tasks = $this->singleTaskAclAwareRepository->findByPerson(
                $person,
                $filterOrder->getQueryString(),
                $flags,
                $paginator->getCurrentPageFirstItemNumber(),
                $paginator->getItemsPerPage(),
                [
                    'startDate' => 'DESC',
                    'endDate' => 'DESC',
                ]
            );
        } else {
            $tasks = [];
        }

        return $this->render(
            '@ChillTask/SingleTask/Person/list.html.twig',
            [
                'tasks' => $tasks,
                'person' => $person,
                'paginator' => $paginator,
                'filter_order' => $filterOrder,
            ]
        );
    }

    /**
     * @return Response
     * @Route(
     *     "/{_locale}/task/single-task/list/my",
     *     name="chill_task_singletask_my_tasks",
     *     defaults={"_format": "html"}
     * )
     * @Route(
     *     "/api/1.0/task/single-task/list/my",
     *     defaults={"_format": "json"}
     * )
     */
    public function myTasksAction(string $_format, Request $request)
    {
        $this->denyAccessUnlessGranted('ROLE_USER');

        $filterOrder = $this->buildFilterOrder();
        $flags = array_merge(
            $filterOrder->getCheckboxData('status'),
            array_map(static fn ($i) => 'state_' . $i, $filterOrder->getCheckboxData('states'))
        );
        $nb = $this->singleTaskAclAwareRepository->countByCurrentUsersTasks(
            $filterOrder->getQueryString(),
            $flags
        );

        if ('json' === $_format && $request->query->getBoolean('countOnly')) {
            return $this->json(
                new Counter($nb),
            );
        }

        $paginator = $this->paginatorFactory->create($nb);
        $tasks = $this->singleTaskAclAwareRepository->findByCurrentUsersTasks(
            $filterOrder->getQueryString(),
            $flags,
            $paginator->getCurrentPageFirstItemNumber(),
            $paginator->getItemsPerPage(),
            [
                'startDate' => 'DESC',
                'endDate' => 'DESC',
            ]
        );

        switch ($_format) {
            case 'html':
                return $this->render('@ChillTask/SingleTask/List/index_my_tasks.html.twig', [
                    'tasks' => $tasks,
                    'paginator' => $paginator,
                    'filter_order' => $filterOrder,
                ]);

            case 'json':
                $collection = new Collection($tasks, $paginator);

                return $this->json(
                    $collection,
                    JsonResponse::HTTP_OK,
                    [],
                    ['groups' => ['read']]
                );

            default:
                throw new BadRequestHttpException("format not supported: {$_format}");
        }
    }

    /**
     * @Route(
     *     "/{_locale}/task/single-task/new",
     *     name="chill_task_single_task_new"
     * )
     */
    public function newAction(Request $request)
    {
        $task = (new SingleTask())
            ->setAssignee($this->getUser())
            ->setType('task_default');

        $entityType = $this->getEntityContext($request);

        if (null === $entityType) {
            throw new BadRequestHttpException('You must provide a entity_type');
        }

        $entityId = $request->query->getInt("{$entityType}_id", 0);

        if (null === $entityId) {
            return new BadRequestHttpException("You must provide a {$entityType}_id");
        }

        switch ($entityType) {
            case 'person':
                $person = $this->getDoctrine()->getManager()
                    ->getRepository(Person::class)
                    ->find($entityId);

                if (null === $person) {
                    $this->createNotFoundException('Invalid person id');
                }

                $task->setPerson($person);
                $role = TaskVoter::CREATE_PERSON;

                break;

            case 'course':
                $course = $this->getDoctrine()->getManager()
                    ->getRepository(AccompanyingPeriod::class)
                    ->find($entityId);

                if (null === $course) {
                    $this->createNotFoundException('Invalid accompanying course id');
                }

                $task->setCourse($course);
                $role = TaskVoter::CREATE_COURSE;

                break;

            default:
                return new BadRequestHttpException("context with {$entityType} is not supported");
        }

        $this->denyAccessUnlessGranted($role, $task, 'You are not '
             . 'allowed to create this task');

        $form = $this->setCreateForm($task, $role);

        $form->handleRequest($request);

        if ($form->isSubmitted()) {
            if ($form->isValid()) {
                $em = $this->getDoctrine()->getManager();
                $em->persist($task);

                $this->eventDispatcher->dispatch(TaskEvent::PERSIST, new TaskEvent($task));

                $em->flush();

                $this->addFlash('success', $this->translator->trans('The task is created'));

                if ($request->query->has('returnPath')) {
                    return $this->redirect($request->query->get('returnPath'));
                }

                if ('person' === $entityType) {
                    return $this->redirectToRoute('chill_task_singletask_by-person_list', [
                        'id' => $task->getPerson()->getId(),
                    ]);
                }

                if ('course' === $entityType) {
                    return $this->redirectToRoute('chill_task_singletask_by-course_list', [
                        'id' => $task->getCourse()->getId(),
                    ]);
                }
            } else {
                $this->addFlash('error', $this->translator->trans('This form contains errors'));
            }
        }

        switch ($entityType) {
            case 'person':
                return $this->render('@ChillTask/SingleTask/Person/new.html.twig', [
                    'form' => $form->createView(),
                    'task' => $task,
                    'person' => $task->getPerson(),
                ]);

            case 'course':
                return $this->render('@ChillTask/SingleTask/AccompanyingCourse/new.html.twig', [
                    'form' => $form->createView(),
                    'task' => $task,
                    'accompanyingCourse' => $task->getCourse(),
                ]);

            default:
                throw new LogicException('entity context not supported');
        }
    }

    /**
     * @Route(
     *     "/{_locale}/task/single-task/{id}/show",
     *     name="chill_task_single_task_show"
     * )
     */
    public function showAction(SingleTask $task, Request $request)
    {
        $this->denyAccessUnlessGranted(TaskVoter::SHOW, $task);

        if ($task->getContext() instanceof Person) {
            $event = new PrivacyEvent($task->getContext(), [
                'element_class' => SingleTask::class,
                'element_id' => $task->getId(),
                'action' => 'show',
            ]);
            $this->eventDispatcher->dispatch(PrivacyEvent::PERSON_PRIVACY_EVENT, $event);
        }

        $timeline = $this->timelineBuilder
            ->getTimelineHTML('task', ['task' => $task]);

        if ($task->getContext() instanceof Person) {
            return $this->render('@ChillTask/SingleTask/Person/show.html.twig', [
                'task' => $task,
                'timeline' => $timeline,
            ]);
        }

        return $this->render('@ChillTask/SingleTask/AccompanyingCourse/show.html.twig', [
            'task' => $task,
            'timeline' => $timeline,
        ]);
    }

    /**
     * @return \Symfony\Component\Form\FormInterface
     */
    protected function setCreateForm(SingleTask $task, string $role)
    {
        $form = $this->createForm(SingleTaskType::class, $task, [
            'role' => $role,
        ]);

        $form->add('submit', SubmitType::class);

        return $form;
    }

    private function buildFilterOrder(): FilterOrderHelper
    {
        $statuses = ['no-alert', 'warning', 'alert'];
        $statusTrans = [
            'Tasks without alert',
            'Tasks near deadline',
            'Tasks over deadline',
        ];
        $states = [
            // todo: get a list of possible states dynamically
            'new', 'in_progress', 'closed', 'canceled',
        ];

        return $this->filterOrderHelperFactory
            ->create(self::class)
            ->addSearchBox()
            ->addCheckbox('status', $statuses, $statuses, $statusTrans)
            ->addCheckbox('states', $states, ['new', 'in_progress'])
            ->addUserPickers('userPicker', 'userPicker', ['multiple' => True])
            ->build();
    }

    /**
     * Creates a form to delete a Task entity by id.
     * @param mixed $id
     */
    private function createDeleteForm($id): FormInterface
    {
        return $this->createFormBuilder()
            ->setAction($this->generateUrl(
                'chill_task_single_task_delete',
                ['id' => $id]
            ))
            ->setMethod('DELETE')
            ->add('submit', SubmitType::class, ['label' => 'Delete'])
            ->getForm();
    }

    private function getEntityContext(Request $request)
    {
        if ($request->query->has('person_id')) {
            return 'person';
        }

        if ($request->query->has('course_id')) {
            return 'course';
        }

        return null;
    }
}