<?php

declare(strict_types=1);

namespace App\Service;

use App\Email\Mailer;
use App\Entity\Booking;
use App\Enum\ResourceType;
use App\Model\SeriesResult;
use App\Repository\ResourceTypeSettingsRepository;

/**
 * Tells whoever an administrator named that something was booked.
 *
 * Recipients are configured per ResourceType rather than per resource or per group, because that
 * is the level the admin screen groups by and the only one every resource is guaranteed to have:
 * a resource's group is optional, and a kind that is not split into groups -- rooms, cars --
 * would otherwise never notify anybody.
 *
 * **Nothing here may break a booking.** It runs after the transaction has committed, so a
 * failure cannot roll anything back -- and Mailer never throws, so the person who booked is not
 * shown an error about somebody else's mail server.
 */
final readonly class BookingNotifier
{
    public function __construct(
        private Mailer $mailer,
        private ResourceTypeSettingsRepository $settings,
    ) {
    }

    public function bookingCreated(Booking $booking): void
    {
        $resource = $booking->getResource();

        $this->send(
            $resource->getType(),
            \sprintf('Neue Buchung: %s am %s', $resource->getLabel(), $booking->getDate()->format('d.m.Y')),
            'email/booking_created',
            ['booking' => $booking],
        );
    }

    /**
     * One mail for a whole series, not one per occurrence.
     *
     * A year of weekly bookings is the same act and would otherwise arrive as fifty-two mails in
     * one second -- the same reason AuditLogger records a series once rather than per day.
     */
    public function seriesCreated(SeriesResult $result): void
    {
        if ($result->isCompletelyBlocked()) {
            return;
        }

        $series = $result->series;
        $resource = $series->getResource();

        $this->send(
            $resource->getType(),
            \sprintf('Neue Serienbuchung: %s ab %s', $resource->getLabel(), $series->getStartDate()->format('d.m.Y')),
            'email/series_created',
            ['result' => $result, 'series' => $series],
        );
    }

    /**
     * @param array<string, mixed> $context
     */
    private function send(ResourceType $type, string $subject, string $template, array $context): void
    {
        $this->mailer->send($this->settings->recipientsFor($type), $subject, $template, $context);
    }
}