import type { SimulationFunction } from '@x12i/api-simulator';
import type { Member } from '../data/members.js';

/**
 * GET /members/:memberId
 *
 * This handler never touches the ledger -- it reads straight from
 * `SimulationContext.data`, which is the same `data.members` array the
 * `members-api` was created with. Simple lookups don't need a separate store.
 */
export const getMember: SimulationFunction = ({ request, data }) => {
  const members = (data as { members?: Member[] }).members ?? [];
  const member = members.find((candidate) => candidate.id === request.params.memberId);

  if (!member) {
    return {
      status: 404,
      body: { error: 'MEMBER_NOT_FOUND', message: `No member with id ${request.params.memberId}.` }
    };
  }

  return { status: 200, body: member };
};