hado/core/app/Scheduling/WindowResolver.php

<?php

namespace App\Scheduling;

use App\Enums\EventState;
use App\Models\User;
use Carbon\CarbonImmutable;

final class WindowResolver
{
    /** @param list<int> $fallbackHours */
    public function __construct(
        private readonly int $dayMarginMinutes,
        private readonly int $hourMarginMinutes,
        private readonly array $fallbackHours,
    ) {}

    /** Окно, открытое в момент $now, или null (тихие часы / срок прошёл / состояние не напоминает). */
    public function current(EventState $state, User $user, Due $due, CarbonImmutable $now): ?Window
    {
        $activeStart = $user->activeStart($now);
        $activeEnd = $user->activeEnd($now);
        if ($now->lt($activeStart) || $now->gte($activeEnd)) {
            return null;
        }

        return match ($state) {
            EventState::Preparing, EventState::Overdue => new Window(
                $activeStart, $activeEnd, true, $activeEnd->subMinutes($this->dayMarginMinutes),
            ),
            EventState::Today => $this->hourly($due, $now, $activeEnd),
            default => null,
        };
    }

    private function hourly(Due $due, CarbonImmutable $now, CarbonImmutable $activeEnd): ?Window
    {
        $start = $now->startOfHour();
        $end = $start->addHour()->min($activeEnd);

        $truncated = false;
        if ($due->moment->gt($start) && $due->moment->lt($end)) {
            $end = $due->moment;
            $truncated = true;
        }

        if ($now->gte($end)) {
            return null;
        }

        $fallbackAllowed = $truncated || in_array((int) $start->format('G'), $this->fallbackHours, true);

        return new Window($start, $end, $fallbackAllowed, $end->subMinutes($this->hourMarginMinutes));
    }
}