<?php

declare(strict_types=1);

namespace App\Dashboard\Widget;

use App\Dashboard\Contract\DashboardWidgetProviderInterface;
use App\Entity\BookingEditDraft;
use App\Model\DashboardWidget;
use App\Model\DashboardWidgetEntry;
use App\Repository\BookingEditDraftRepository;
use App\Security\Role;
use Symfony\Component\Routing\Generator\UrlGeneratorInterface;

/**
 * Customers whose changes cannot be saved.
 *
 * A draft is deleted as soon as an update succeeds, so one that has been around for days belongs to
 * somebody BusPro keeps refusing — and nothing else tells anyone. One booking accumulated
 * thirty-seven failed attempts across two months before it was noticed by accident; the customer
 * had entered seventy-nine participants, none of which ever reached BusPro. The point of this card
 * is that the next one gets noticed in the first week instead.
 *
 * Each entry links to the draft, since the age alone does not say what is going wrong.
 */
class StuckBookingDraftsWidgetProvider implements DashboardWidgetProviderInterface
{
    /**
     * How long a draft must have survived to be worth reporting.
     *
     * Short enough to catch a customer inside their first week of trying, long enough that an edit
     * somebody merely abandoned over a weekend does not fill the card.
     */
    private const MIN_AGE_DAYS = 7;

    private const LIMIT = 10;

    public function __construct(
        private readonly BookingEditDraftRepository $draftRepository,
        private readonly UrlGeneratorInterface $urlGenerator,
    ) {
    }

    public function getRequiredRole(): string
    {
        return Role::CUSTOMER_EXPERT;
    }

    public function getPriority(): int
    {
        return 95;
    }

    public function build(): ?DashboardWidget
    {
        $drafts = $this->draftRepository->findStuck(self::MIN_AGE_DAYS, self::LIMIT);

        return new DashboardWidget(
            'Festhängende Buchungsänderungen',
            array_map(fn (BookingEditDraft $draft): DashboardWidgetEntry => new DashboardWidgetEntry(
                $this->label($draft),
                $this->urlGenerator->generate('app_admin_bookingeditdraft_show', ['id' => $draft->getId()]),
                'edit',
            ), $drafts),
            'Keine festhängenden Buchungsänderungen.',
            $this->urlGenerator->generate('app_admin_bookingeditdraft'),
            'Alle Buchungsentwürfe',
        );
    }

    /**
     * Names the booking, how long it has been stuck, and when the customer last tried.
     *
     * The gap between the two is what distinguishes an abandoned edit from somebody still trying
     * every few days and getting nowhere.
     */
    private function label(BookingEditDraft $draft): string
    {
        $days = $draft->getCreatedAt()->diff(new \DateTimeImmutable())->days ?? 0;

        return sprintf(
            'Vorgang %s (%s) — seit %d Tagen, zuletzt %s',
            $draft->getBookingNumber() ?? $draft->getBookingId(),
            (string) $draft->getUser()->getEmail(),
            $days,
            $draft->getUpdatedAt()->format('d.m.Y'),
        );
    }
}