import type { components } from '@pipu/api-client';
import { unwrap } from '@pipu/core';
import { useInfiniteQuery } from '@tanstack/react-query';
import { useTranslation } from 'react-i18next';

import { useSession } from '../../app/session';
import { useErrorText } from '../../shared/lib/errors';
import { formatDateTime } from '../../shared/lib/format';
import { Button, EmptyState, FormError, PageSkeleton } from '../../shared/ui/ui';
import s from '../page.module.css';

type Entry = components['schemas']['AuditEntry'];

/** Краткое описание полезной нагрузки записи: «user → moderator», «anna (user)». */
function details(e: Entry, roleName: (r: string) => string): string {
  const p = e.payload ?? {};
  if (e.action === 'user.role_change') return `${roleName(String(p.from))} → ${roleName(String(p.to))}`;
  if (e.action === 'user.username_change') return `${String(p.from)} → ${String(p.to)}`;
  const parts = [p.username, p.role && roleName(String(p.role)), p.display_name].filter(
    (v): v is string => typeof v === 'string' && v !== '',
  );
  return parts.join(' · ');
}

export function AuditPage() {
  const { t, i18n } = useTranslation(['admin', 'common']);
  const session = useSession();
  const errorText = useErrorText();
  const list = useInfiniteQuery({
    queryKey: ['admin-audit'],
    initialPageParam: undefined as string | undefined,
    queryFn: async ({ pageParam }) =>
      unwrap(await session.client.GET('/api/v1/admin/audit', { params: { query: { cursor: pageParam, limit: 50 } } })),
    getNextPageParam: (page) => page.next_cursor ?? undefined,
  });
  const entries = list.data?.pages.flatMap((p) => p.items) ?? [];
  const tr = t as unknown as (key: string, opts?: Record<string, unknown>) => string;
  const roleName = (r: string) => tr(`common:roles.${r}`, { defaultValue: r });

  return (
    <div className={s.page}>
      <div className={s.head}>
        <div>
          <h1>{t('audit.title')}</h1>
          <p className={s.subtitle}>{t('audit.subtitle')}</p>
        </div>
      </div>
      <FormError>{list.error ? errorText(list.error) : null}</FormError>
      <div className={s.tableWrap}>
        <table className={s.table}>
          <thead>
            <tr>
              <th>{t('audit.col_when')}</th>
              <th>{t('audit.col_who')}</th>
              <th>{t('audit.col_action')}</th>
              <th>{t('audit.col_details')}</th>
            </tr>
          </thead>
          <tbody>
            {entries.map((e) => (
              <tr key={e.id}>
                <td className={s.muted}>{formatDateTime(e.created_at, i18n.language)}</td>
                <td>{e.actor ? `@${e.actor.username}` : <span className={s.muted}>{t('audit.system')}</span>}</td>
                <td>{tr(`admin:audit.actions.${e.action}`, { defaultValue: e.action })}</td>
                <td className={s.muted}>{details(e, roleName)}</td>
              </tr>
            ))}
          </tbody>
        </table>
        {list.isSuccess && entries.length === 0 && <EmptyState>{t('audit.empty')}</EmptyState>}
        {list.isPending && <PageSkeleton />}
      </div>
      {list.hasNextPage && (
        <Button className={s.more} busy={list.isFetchingNextPage} onClick={() => void list.fetchNextPage()}>
          {t('audit.more')}
        </Button>
      )}
    </div>
  );
}