<?php namespace RVR\Controller;

use Container;
use DateTime;
use RVR\Finance\ExchangeRateCalculator;
use RVR\PersistentData\Model\Community;
use RVR\PersistentData\Model\CommunityMember;
use RVR\PersistentData\Model\Event;
use RVR\PersistentData\Model\User;
use RVR\Repository\CommunityMemberRepository;
use RVR\Repository\CommunityRepository;
use RVR\Repository\EventRepository;
use RVR\Repository\TransactionRepository;
use SokoWeb\Interfaces\Authentication\IAuthenticationRequired;
use SokoWeb\Interfaces\Authorization\ISecured;
use SokoWeb\Interfaces\Response\IContent;
use SokoWeb\Response\HtmlContent;
use SokoWeb\Response\JsonContent;

class EventController implements IAuthenticationRequired, ISecured
{
    private CommunityRepository $communityRepository;

    private CommunityMemberRepository $communityMemberRepository;

    private EventRepository $eventRepository;

    private TransactionRepository $transactionRepository;

    private ?Community $community;

    private ?CommunityMember $ownCommunityMember;

    public function __construct()
    {
        $this->communityRepository = new CommunityRepository();
        $this->communityMemberRepository = new CommunityMemberRepository();
        $this->eventRepository = new EventRepository();
        $this->transactionRepository = new TransactionRepository();
    }

    public function isAuthenticationRequired(): bool
    {
        return true;
    }

    public function authorize(): bool
    {
        $communitySlug = \Container::$request->query('communitySlug');
        $this->community = $this->communityRepository->getBySlug($communitySlug);
        if ($this->community === null) {
            return false;
        }

        /**
        * @var User $user
        */
        $user = \Container::$request->user();
        $this->ownCommunityMember = $this->communityMemberRepository->getByCommunityAndUser($this->community, $user);
        if ($this->ownCommunityMember === null) {
            return false;
        }

        return true;
    }

    public function getEvents(): IContent
    {
        $itemsPerPage = 10;
        $numberOfEvents = $this->eventRepository->countAllByCommunity($this->community);
        $currentPage = Container::$request->query('page') ?: 1;
        $events = $this->eventRepository->getPagedByCommunity(
            $this->community,
            $currentPage,
            $itemsPerPage
        );

        return new HtmlContent('events/events', [
            'community' => $this->community,
            'pages' => ceil($numberOfEvents / $itemsPerPage),
            'currentPage' => $currentPage,
            'numberOfEvents' => $numberOfEvents,
            'events' => $events
        ]);
    }

    public function searchEvent(): IContent
    {
        $events = iterator_to_array($this->eventRepository->searchByTitle($this->community, Container::$request->query('q')));
        $results = [];
        foreach ($events as $event) {
            $results[] = ['value' => $event->getId(), 'label' => $event->getTitle()];
        }

        return new JsonContent([
            'results' => $results
        ]);
    }

    public function getEvent(): ?IContent
    {
        $event = $this->eventRepository->getBySlug(Container::$request->query('eventSlug'));
        if (!$event) {
            return null;
        }
        Container::$persistentDataManager->loadRelationsFromDb($this->community, true, ['main_currency']);

        return new HtmlContent('events/event', [
            'community' => $this->community,
            'event' => $event,
            'totalCost' => $this->sumTransactions($event)
        ]);
    }

    public function getEventEdit(): ?IContent
    {
        $eventSlug = Container::$request->query('eventSlug');
        if ($eventSlug) {
            $event = $this->eventRepository->getBySlug($eventSlug);
            if ($event === null) {
                return null;
            }
        } else {
            $event = null;
        }

        return new HtmlContent('events/event_edit', [
            'community' => $this->community,
            'event' => $event
        ]);
    }

    public function saveEvent(): ?IContent
    {
        $eventSlug = Container::$request->query('eventSlug');
        if ($eventSlug) {
            $event = $this->eventRepository->getBySlug($eventSlug);
        } else {
            $event = new Event();
            $event->setCommunity($this->community);
        }

        $event->setTitle(Container::$request->post('title'));
        $event->setDescription(Container::$request->post('description'));
        $event->setStartDate(new DateTime(Container::$request->post('start')));
        $event->setEndDate(new DateTime(Container::$request->post('end')));
        Container::$persistentDataManager->saveToDb($event);

        return new JsonContent([
            'redirect' => ['target' => \Container::$routeCollection->getRoute('community.event')->generateLink(['communitySlug' => $this->community->getSlug(), 'eventSlug' => $event->getSlug()])]
        ]);
    }

    public function deleteEvent(): IContent
    {
        $event = $this->eventRepository->getBySlug(Container::$request->query('eventSlug'));

        foreach ($this->transactionRepository->getAllByEvent($event) as $transaction) {
            $transaction->setEventId(null);
            Container::$persistentDataManager->saveToDb($transaction);
        }

        Container::$persistentDataManager->deleteFromDb($event);

        return new JsonContent(['success' => true]);
    }

    private function sumTransactions(Event $event): float
    {
        $exchangeRateCalculator = new ExchangeRateCalculator($this->community->getMainCurrency());
        $transactions = $this->transactionRepository->getAllByEvent($event, true, ['currency']);
        $sum = 0.0;

        foreach ($transactions as $transaction) {
            $sum += $exchangeRateCalculator->calculate($transaction->getSum(), $transaction->getCurrency(), $transaction->getTimeDate());
        }

        return $sum;
    }
}