<?php

declare(strict_types=1);

namespace App\Service\Exercise;

use DateTimeImmutable;

final readonly class ExerciseYearResolver
{
    /**
     * Convert a date to its leave/RTT exercise year.
     *
     * - Forfait: calendar year (Jan→Dec) — returns $date.Y.
     * - Non-forfait: leave year (Juin N-1 → Mai N) — returns $date.Y+1 if month >= 6, else $date.Y.
     */
    public function forDate(DateTimeImmutable $date, bool $isForfait = false): int
    {
        if ($isForfait) {
            return (int) $date->format('Y');
        }

        return (int) $date->format('n') >= 6
            ? (int) $date->format('Y') + 1
            : (int) $date->format('Y');
    }
}