import type { InvitationListView } from '@dorfteich/shared';
import { useQuery, useQueryClient } from '@tanstack/react-query';
import { useState } from 'react';
import { useTranslation } from 'react-i18next';

import { Field, FormError } from '../components/forms';
import { apiDelete, apiGet, apiPost } from '../lib/api';

const INVITATIONS_QUERY_KEY = ['users', 'me', 'invitations'] as const;

/**
 * Peer invitations in the user settings (issue #332): invite an e-mail
 * address, see your invitations with their status, revoke open ones. The
 * quota line shows how many of the instance-wide per-user allowance are
 * in use; with a quota of 0 the section explains that inviting is off.
 */
export function InvitationsSection(): React.JSX.Element {
  const { t } = useTranslation('invitations');
  const queryClient = useQueryClient();
  const [email, setEmail] = useState('');
  const [sent, setSent] = useState(false);
  const [error, setError] = useState<unknown>(null);
  const [busy, setBusy] = useState(false);

  const list = useQuery({
    queryKey: INVITATIONS_QUERY_KEY,
    queryFn: () => apiGet<InvitationListView>('/invitations'),
  });

  const submit = async (event: React.FormEvent): Promise<void> => {
    event.preventDefault();
    setError(null);
    setSent(false);
    setBusy(true);
    try {
      await apiPost('/invitations', { email });
      setEmail('');
      setSent(true);
      await queryClient.invalidateQueries({ queryKey: INVITATIONS_QUERY_KEY });
    } catch (err) {
      setError(err);
    } finally {
      setBusy(false);
    }
  };

  const revoke = async (id: string): Promise<void> => {
    setError(null);
    await apiDelete(`/invitations/${id}`);
    await queryClient.invalidateQueries({ queryKey: INVITATIONS_QUERY_KEY });
  };

  const data = list.data;
  const disabled = data?.maxOpen === 0;

  return (
    <section className="settings-section invitations">
      <h2>{t('section.title')}</h2>
      {disabled ? (
        <p>{t('section.disabled')}</p>
      ) : (
        <>
          <p className="invitations__intro">{t('section.intro')}</p>
          {data && (
            <p className="invitations__quota">
              {t('section.quota', { open: data.open, max: data.maxOpen })}
            </p>
          )}
          <form onSubmit={(e) => void submit(e)} noValidate className="invitations__form">
            <FormError error={error} />
            {/* Scoped status region: a bare getByRole('status') must stay
                unambiguous for other specs (lesson from #304/legal). */}
            <p className="invitations__sent" role="status">
              {sent ? t('form.sent') : ''}
            </p>
            <Field label={t('form.email')}>
              <input
                type="email"
                value={email}
                required
                onChange={(e) => setEmail(e.target.value)}
              />
            </Field>
            <button type="submit" className="button" disabled={busy || email.length === 0}>
              {t('form.submit')}
            </button>
          </form>
          {data && data.invitations.length === 0 && <p>{t('section.empty')}</p>}
          {data && data.invitations.length > 0 && (
            <div
              className="table-scroll"
              // A scroll container is only operable by keyboard once it is
              // focusable; role+name keep it from being an unlabelled stop.
              tabIndex={0}
              role="region"
              aria-label={t('section.title')}
            >
              <table className="table invitations__table">
                <thead>
                  <tr>
                    <th>{t('columns.email')}</th>
                    <th>{t('columns.status')}</th>
                    <th>{t('columns.created')}</th>
                    <th>{t('columns.expires')}</th>
                    <th>{t('columns.actions')}</th>
                  </tr>
                </thead>
                <tbody>
                  {data.invitations.map((invitation) => (
                    <tr
                      key={invitation.id}
                      className="invitation-row"
                      data-email={invitation.email}
                    >
                      <td>{invitation.email}</td>
                      <td className="invitation-row__status">{t(`status.${invitation.status}`)}</td>
                      <td>{new Date(invitation.createdAt).toLocaleDateString()}</td>
                      <td>{new Date(invitation.expiresAt).toLocaleDateString()}</td>
                      <td>
                        {invitation.status === 'pending' && (
                          <button
                            type="button"
                            className="linklike invitation-row__revoke"
                            onClick={() => void revoke(invitation.id)}
                          >
                            {t('actions.revoke')}
                          </button>
                        )}
                      </td>
                    </tr>
                  ))}
                </tbody>
              </table>
            </div>
          )}
        </>
      )}
    </section>
  );
}