/**
 * Copyright since 2025 Mifos Initiative
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

import { Observable, forkJoin, of } from 'rxjs';
import { catchError, map } from 'rxjs/operators';
import { ClientsService } from 'app/clients/clients.service';

/**
 * Finds clients by name whatever case the officer types it in.
 *
 * The platform's name filter matches anywhere in the name but only in the exact case typed, so
 * "sneha" finds nobody while "Sneha" finds Ms. Sneha Iyer. Names are stored capitalised, so the term
 * is tried as typed, capitalised word by word, and in upper and lower case, and the results merged.
 * Done here rather than by changing the platform's search, which every other screen relies on.
 */
export function searchClientsAnyCase(clientsService: ClientsService, term: string, officeId?: any): Observable<any[]> {
  const variants = Array.from(
    new Set([
      term,
      term.toLowerCase().replace(/(^|[\s.])(\p{L})/gu, (_match, lead, letter) => lead + letter.toUpperCase()),
      term.toUpperCase(),
      term.toLowerCase()
    ])
  );
  return forkJoin(
    variants.map((variant) =>
      clientsService.getFilteredClients('displayName', 'ASC', false, variant, officeId).pipe(
        map((response: any) => {
          const found = response?.pageItems || response || [];
          return Array.isArray(found) ? found : [];
        }),
        catchError(() => of([]))
      )
    )
  ).pipe(
    map((lists: any[][]) => {
      const byId = new Map<number, any>();
      for (const client of lists.flat()) {
        byId.set(client.id, client);
      }
      return Array.from(byId.values()).sort((a, b) => String(a.displayName).localeCompare(String(b.displayName)));
    })
  );
}