<?php

namespace App\Service\Teamer;

use App\Entity\Disposition;
use App\Entity\SeasonAssignment;
use App\Entity\Teamer;
use App\Repository\DispositionRepository;
use App\Repository\SeasonAssignmentRepository;

/**
 * A teamer's upcoming placements as one list, earliest first.
 *
 * "Placement" covers both ways a teamer is placed: a Disposition on an Assignment, or a
 * SeasonAssignment. It is not an entity, only the name for the two together.
 *
 * The two live in separate tables, so no single query can sort or page across both. A teamer
 * has a few dozen upcoming dispositions at most, so both are loaded in full and merged here;
 * callers page or slice the result. Each row carries exactly one of the two records.
 */
class UpcomingPlacementCollector
{
    public function __construct(
        private readonly DispositionRepository $dispositionRepository,
        private readonly SeasonAssignmentRepository $seasonAssignmentRepository,
    ) {
    }

    /**
     * @return list<array{dateFrom: ?\DateTimeImmutable, dateTo: ?\DateTimeImmutable, disposition: ?Disposition, seasonAssignment: ?SeasonAssignment}>
     */
    public function collect(Teamer $teamer): array
    {
        $rows = [];

        // season assignments first: the sort is stable, so on the same start day the season,
        // which frames the dispositions inside it, comes before them
        foreach ($this->seasonAssignmentRepository->findUpcomingByTeamer($teamer) as $seasonAssignment) {
            $rows[] = [
                'dateFrom' => $seasonAssignment->getDateFrom(),
                'dateTo' => $seasonAssignment->getDateTo(),
                'disposition' => null,
                'seasonAssignment' => $seasonAssignment,
            ];
        }

        foreach ($this->dispositionRepository->findAllUpcomingByTeamer($teamer) as $disposition) {
            $destination = $disposition->getAssignment()?->getDestination();

            $rows[] = [
                'dateFrom' => $destination?->getDateFrom(),
                'dateTo' => $destination?->getDateTo(),
                'disposition' => $disposition,
                'seasonAssignment' => null,
            ];
        }

        usort($rows, static fn (array $a, array $b): int => $a['dateFrom'] <=> $b['dateFrom']);

        return $rows;
    }
}