<?php

namespace App\Repository;

use App\Entity\Application;
use App\Entity\Assignment;
use App\Entity\Teamer;
use App\Model\ApplicationFilterDto;
use App\Model\AssignmentFilterDto;
use App\Repository\Filter\SeasonPeriodFilter;
use App\Repository\Traits\QueryHelperTrait;
use Carbon\CarbonPeriodImmutable;
use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
use Doctrine\ORM\Query;
use Doctrine\Persistence\ManagerRegistry;

/**
 * @extends ServiceEntityRepository<Application>
 *
 * @method Application|null find($id, $lockMode = null, $lockVersion = null)
 * @method Application|null findOneBy(array $criteria, array $orderBy = null)
 * @method Application[]    findAll()
 * @method Application[]    findBy(array $criteria, array $orderBy = null, $limit = null, $offset = null)
 */
class ApplicationRepository extends ServiceEntityRepository
{
    use QueryHelperTrait;

    public function __construct(ManagerRegistry $registry)
    {
        parent::__construct($registry, Application::class);
    }

    public function getPendingQuery(ApplicationFilterDto $filterDto): Query
    {
        $qb = $this->createQueryBuilder('application');

        $qb
            ->select('application', 'assignment', 'job_profile', 'destination', 'teamer', 'user')
            ->innerJoin('application.assignment', 'assignment')
            ->innerJoin('assignment.destination', 'destination')
            ->innerJoin('assignment.jobProfile', 'job_profile')
            ->innerJoin('application.teamer', 'teamer')
            ->innerJoin('teamer.user', 'user')
            ->where($qb->expr()->neq('application.status', ':status'))
            ->setParameter('status', Application::STATUS_REJECTED)
        ;

        if (false === $filterDto->isIncludePast()) {
            $qb
                ->andWhere($qb->expr()->gte('destination.dateFrom', ':now'))
                ->setParameter('now', new \DateTimeImmutable())
            ;
        }
        if (null !== $dateFrom = $filterDto->getDateFrom()) {
            $qb
                ->andWhere($qb->expr()->gte('destination.dateFrom', ':dateFrom'))
                ->setParameter('dateFrom', $dateFrom)
            ;
        }

        if (null !== $dateTo = $filterDto->getDateTo()) {
            $qb
                ->andWhere($qb->expr()->lte('destination.dateTo', ':dateTo'))
                ->setParameter('dateTo', $dateTo)
            ;
        }

        if ($jobProfiles = $filterDto->getJobProfiles()) {
            $qb
                ->andWhere($qb->expr()->in('assignment.jobProfile', ':jobProfiles'))
                ->setParameter('jobProfiles', $jobProfiles)
            ;
        }

        if (0 < count($filterDto->getHotels())) {
            $constraints = [];
            foreach ($filterDto->getHotels() as $index => $hotel) {
                $constraints[] = $qb->expr()->like('destination.hotel', ':hotel'.$index);
            }
            $qb->andWhere($qb->expr()->orX(...$constraints));
            foreach ($filterDto->getHotels() as $index => $hotel) {
                $qb->setParameter('hotel'.$index, '%'.$hotel.'%');
            }
        }

        if (null !== $duration = $filterDto->getDuration()) {
            $days = match ($duration) {
                AssignmentFilterDto::DURATION_WEEKEND => [2, 4],
                AssignmentFilterDto::DURATION_MID_WEEK => [5, 6],
                AssignmentFilterDto::DURATION_FULL_WEEK => [7, 7],
                default => [8, 0],
            };

            [$minDays, $maxDays] = $days;

            $qb
                ->andWhere($qb->expr()->gte('DATEDIFF(destination.dateTo, destination.dateFrom)', ':minDays'))
                ->setParameter('minDays', $minDays)
            ;

            if (0 < $maxDays) {
                $qb
                    ->andWhere($qb->expr()->lte('DATEDIFF(destination.dateTo, destination.dateFrom)', ':maxDays'))
                    ->setParameter('maxDays', $maxDays)
                ;
            }
        }

        if (null !== $country = $filterDto->getCountry()) {
            $qb
                ->andWhere($qb->expr()->eq('destination.country', ':country'))
                ->setParameter('country', $country)
            ;
        }

        $teamerName = $filterDto->getTeamerName();
        if (null !== $teamerName && '' !== trim($teamerName)) {
            $qb
                ->andWhere($qb->expr()->orX(
                    $qb->expr()->like('user.firstName', ':teamerName'),
                    $qb->expr()->like('user.lastName', ':teamerName')
                ))
                ->setParameter('teamerName', '%'.$this->escapeLikeWildcards($teamerName).'%')
            ;
        }

        return $qb->getQuery();
    }

    public function getPendingForTeamerQuery(Teamer $teamer): Query
    {
        $qb = $this->createQueryBuilder('application');

        return $qb
            ->select('application', 'assignment', 'destination', 'job_profile')
            ->innerJoin('application.assignment', 'assignment')
            ->innerJoin('assignment.destination', 'destination')
            ->innerJoin('assignment.jobProfile', 'job_profile')
            ->where($qb->expr()->andX(
                $qb->expr()->eq('application.teamer', ':teamer'),
                $qb->expr()->orX(
                    $qb->expr()->neq('application.status', ':status'),
                    $qb->expr()->andX(
                        $qb->expr()->eq('application.status', ':status'),
                        $qb->expr()->gt('destination.dateFrom', ':today')
                    )
                )
            ))
            ->setParameter('teamer', $teamer)
            ->setParameter('status', Application::STATUS_REJECTED)
            ->setParameter('today', new \DateTime())
            ->getQuery()
        ;
    }

    public function getPendingForTeamer(Teamer $teamer, int $limit = 5): array
    {
        return $this
            ->getPendingForTeamerQuery($teamer)
            ->setMaxResults($limit)
            ->getResult()
        ;
    }

    /**
     * Finds all applications of a teamer whose assignment period overlaps the given period.
     *
     * The assignment period is the date range of its destination. Boundaries count as an
     * overlap: a teamer cannot end one assignment on the same day another one begins.
     *
     * @return array<Application>
     */
    public function findOverlappingForTeamer(Teamer $teamer, CarbonPeriodImmutable $period): array
    {
        return $this
            ->getOverlappingForTeamerQuery($teamer, $period)
            ->getResult()
        ;
    }

    public function getOverlappingForTeamerQuery(Teamer $teamer, CarbonPeriodImmutable $period): Query
    {
        $qb = $this->createQueryBuilder('application');

        return $qb
            ->innerJoin('application.assignment', 'assignment')
            ->innerJoin('assignment.destination', 'destination')
            ->where($qb->expr()->andX(
                $qb->expr()->eq('application.teamer', ':teamer'),
                $qb->expr()->neq('application.status', ':application_rejected'),
                $qb->expr()->neq('assignment.status', ':assignment_called_off'),
                $qb->expr()->isNull('assignment.deletedAt'),
                $qb->expr()->isNull('destination.deletedAt'),
                $qb->expr()->lte('destination.dateFrom', ':dateTo'),
                $qb->expr()->gte('destination.dateTo', ':dateFrom')
            ))
            ->setParameter('teamer', $teamer)
            ->setParameter('application_rejected', Application::STATUS_REJECTED)
            ->setParameter('assignment_called_off', Assignment::STATUS_CALLED_OFF)
            ->setParameter('dateFrom', $period->start->toDateTimeImmutable())
            ->setParameter('dateTo', $period->end->toDateTimeImmutable())
            ->getQuery()
        ;
    }

    public function getCurrentByAssignment(Assignment $assignment): array
    {
        $qb = $this->createQueryBuilder('application');

        return $qb
            ->select('application', 'teamer', 'feedback')
            ->innerJoin('application.teamer', 'teamer')
            ->leftJoin('teamer.feedback', 'feedback')
            ->where($qb->expr()->eq('application.assignment', ':assignment'))
            ->setParameter('assignment', $assignment)
            ->getQuery()
            ->getResult()
        ;
    }

    public function getNew(int $limit = 5): array
    {
        $qb = $this->createQueryBuilder('application');

        return $qb
            ->select('application', 'assignment', 'destination', 'job_profile', 'teamer', 'user')
            ->innerJoin('application.assignment', 'assignment')
            ->innerJoin('assignment.destination', 'destination')
            ->innerJoin('assignment.jobProfile', 'job_profile')
            ->innerJoin('application.teamer', 'teamer')
            ->innerJoin('teamer.user', 'user')
            ->where($qb->expr()->neq('application.status', ':status'))
            ->orderBy('application.createdAt', \SortDirection::Descending)
            ->setParameter('status', Application::STATUS_REJECTED)
            ->setMaxResults($limit)
            ->getQuery()
            ->getResult()
        ;
    }

    public function getCountByStatus(string $status): ?int
    {
        $qb = $this->createQueryBuilder('application');

        return $qb
            ->select($qb->expr()->count('application'))
            ->where($qb->expr()->eq('application.status', ':status'))
            ->setParameter('status', $status)
            ->getQuery()
            ->getSingleScalarResult()
        ;
    }

    /**
     * The raw application tally grouped by normalized hotel code.
     *
     * Mirrors DispositionRepository::getFeedbackStatisticsByNormalizedHotelCodeQuery() - the
     * "Bewerbungen pro Destination" screen sits next to "Feedback pro Destination" and means the
     * same thing by a destination and a season, so the normalization and the date filter are the
     * shared ones.
     *
     * Status is deliberately not broken out: an application's status moves over its lifetime, so a
     * snapshot of the current status is not a meaningful figure for a past period.
     */
    public function getApplicationsByDestinationQuery(
        ?\DateTimeImmutable $dateFrom = null,
        ?\DateTimeImmutable $dateTo = null,
    ): Query {
        $qb = $this->createQueryBuilder('application');

        // Normalize hotel code: strip SER prefix to get base 3-char code
        $normalizedHotelCode = "CASE WHEN destination.hotelCode LIKE 'SER%' THEN SUBSTRING(destination.hotelCode, 4, 3) ELSE SUBSTRING(destination.hotelCode, 1, 3) END";

        $qb
            ->select(
                $normalizedHotelCode.' AS hotelCode',
                'COUNT(application.id) AS totalCount'
            )
            ->innerJoin('application.assignment', 'assignment')
            ->innerJoin('assignment.destination', 'destination')
            ->groupBy('hotelCode')
            ->orderBy('totalCount', \SortDirection::Descending)
            ->addOrderBy('hotelCode', \SortDirection::Ascending)
        ;

        SeasonPeriodFilter::apply($qb, $dateFrom, $dateTo);

        return $qb->getQuery();
    }

    /**
     * Returns the application count grouped by normalized hotel code (base 3-char code).
     *
     * @return array<int, array{
     *     hotelCode: string,
     *     total: int
     * }>
     */
    public function getApplicationsByDestination(
        ?\DateTimeImmutable $dateFrom = null,
        ?\DateTimeImmutable $dateTo = null,
    ): array {
        return array_map(static fn (array $row): array => [
            'hotelCode' => $row['hotelCode'],
            'total' => (int) $row['totalCount'],
        ], $this->getApplicationsByDestinationQuery($dateFrom, $dateTo)->getResult());
    }
}