/**
 * DBIS Core Banking client — STUB.
 *
 * The `d-bis/dbis_core` system is fully specified (707-line README describing
 * Global Ledger, Accounts, Payments, FX Engine, CBDC, Compliance, Settlement)
 * but it is not currently deployed at any resolvable hostname. `api.dbis-core.d-bis.org`
 * fails DNS.
 *
 * Every method here returns the existing sample data from `src/data/portalData.ts`
 * with a one-time console.warn so it's obvious the portal is not yet wired to
 * the real ledger. Flip `endpoints.dbisCore.mocked = false` (and implement the
 * fetch bodies below) when the core banking API is stood up.
 */

import type { Account, FinancialSummary, TreasuryPosition, CashForecast, SettlementRecord, ReportConfig } from '../types/portal';
import { sampleAccounts, financialSummary, treasuryPositions, cashForecasts, settlementRecords, reportConfigs } from '../data/portalData';
import { endpoints } from '../config/endpoints';

let warned = false;
function warnMock(method: string): void {
  if (warned) return;
  warned = true;
  // eslint-disable-next-line no-console
  console.warn(
    `[dbisCore] Using sample data for ${method}() — dbis_core API is not deployed. ` +
    `Set VITE_DBIS_CORE_API_BASE_URL and flip endpoints.dbisCore.mocked once available.`,
  );
}

function delay<T>(value: T, ms = 150): Promise<T> {
  return new Promise(resolve => setTimeout(() => resolve(value), ms));
}

export async function listAccounts(): Promise<Account[]> {
  if (endpoints.dbisCore.mocked) { warnMock('listAccounts'); return delay(sampleAccounts); }
  // TODO: fetch(`${endpoints.dbisCore.apiBaseUrl}/v1/accounts`)
  throw new Error('dbis_core live mode not implemented');
}

export async function getFinancialSummary(): Promise<FinancialSummary> {
  if (endpoints.dbisCore.mocked) { warnMock('getFinancialSummary'); return delay(financialSummary); }
  throw new Error('dbis_core live mode not implemented');
}

export async function listTreasuryPositions(): Promise<TreasuryPosition[]> {
  if (endpoints.dbisCore.mocked) { warnMock('listTreasuryPositions'); return delay(treasuryPositions); }
  throw new Error('dbis_core live mode not implemented');
}

export async function listCashForecasts(): Promise<CashForecast[]> {
  if (endpoints.dbisCore.mocked) { warnMock('listCashForecasts'); return delay(cashForecasts); }
  throw new Error('dbis_core live mode not implemented');
}

export async function listSettlements(): Promise<SettlementRecord[]> {
  if (endpoints.dbisCore.mocked) { warnMock('listSettlements'); return delay(settlementRecords); }
  throw new Error('dbis_core live mode not implemented');
}

export async function listReports(): Promise<ReportConfig[]> {
  if (endpoints.dbisCore.mocked) { warnMock('listReports'); return delay(reportConfigs); }
  throw new Error('dbis_core live mode not implemented');
}