/**
 * @file globalHistoryAutomat.js
 * @description Virtualized grid automat (`globalHistoryGridAutomat`) for
 * infinite-scrolling global audit/change history via `react-virtual-aggridautomat`.
 *
 * Upstream Triggers:
 * - `authAutomat`: Subscribes to auth state changes — calls `reload()` when
 *   status reaches `'authed'` with a `selectedCompanyId`.
 * - AG Grid: Triggers `fetchRows()` on viewport scroll, sort, or filter changes.
 */

import { createGridAutomat } from 'react-virtual-aggridautomat/createGridAutomat';
import { globalHistory } from '../api';
import authAutomat from './authAutomat';

export const globalHistoryGridAutomat = createGridAutomat({
  name: 'globalHistory',
  blockSize: 50,
  fetchRows: async ({ startRow, endRow, sortModel, filterModel }) => {
    try {
      const res = await globalHistory.list({
        startRow,
        endRow,
        sortModel,
        filterModel,
      });
      const rows = res?.rows ?? res?.history ?? res?.entries ?? (Array.isArray(res) ? res : []);
      const total = res?.total ?? res?.totalRows ?? res?.totalCount;
      const lastRow = total != null ? total : (rows.length < (endRow - startRow) ? startRow + rows.length : undefined);
      return { rows, lastRow };
    } catch (err) {
      console.warn('Failed to fetch global history (backend route pending):', err);
      return { rows: [], lastRow: 0 };
    }
  },
});

// Reload on company switch or auth change
authAutomat.subscribe((auth) => {
  if (auth.status === 'authed' && auth.user?.selectedCompanyId) {
    globalHistoryGridAutomat.actions.reload();
  }
});

export default globalHistoryGridAutomat;