/*
 This file is part of GNU Taler
 (C) 2020 Taler Systems S.A.

 GNU Taler is free software; you can redistribute it and/or modify it under the
 terms of the GNU General Public License as published by the Free Software
 Foundation; either version 3, or (at your option) any later version.

 GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with
 GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
 */

/**
 * Imports.
 */
import {
  ExchangesListResponse,
  TalerCorebankApiClient,
  TalerErrorCode,
  URL,
  j2s,
} from "@gnu-taler/taler-util";
import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
import { defaultCoinConfig } from "../harness/denomStructures.js";
import {
  FaultInjectedExchangeService,
  FaultInjectionResponseContext,
} from "../harness/faultInjection.js";
import {
  BankService,
  ExchangeService,
  GlobalTestState,
  MerchantService,
  WalletCli,
  generateRandomPayto,
  setupDb,
} from "../harness/harness.js";

/**
 * Test if the wallet handles outdated exchange versions correctly.
 */
export async function runExchangeManagementFaultTest(
  t: GlobalTestState,
): Promise<void> {
  // Set up test environment

  const db = await setupDb(t);

  const bank = await BankService.create(t, {
    allowRegistrations: true,
    currency: "TESTKUDOS",
    database: db.connStr,
    httpPort: 8082,
  });

  const exchange = ExchangeService.create(t, {
    name: "testexchange-1",
    currency: "TESTKUDOS",
    httpPort: 8081,
    database: db.connStr,
  });

  const merchant = await MerchantService.create(t, {
    name: "testmerchant-1",
    currency: "TESTKUDOS",
    httpPort: 8083,
    database: db.connStr,
  });

  const exchangeBankAccount = await bank.createExchangeAccount(
    "myexchange",
    "x",
  );
  exchange.addBankAccount("1", exchangeBankAccount);

  const faultyExchange = new FaultInjectedExchangeService(t, exchange, 8091);
  // Base URL must contain port that the proxy is listening on.
  await exchange.modifyConfig(async (config) => {
    config.setString("exchange", "base_url", "http://localhost:8091/");
  });

  bank.setSuggestedExchange(
    faultyExchange,
    exchangeBankAccount.accountPaytoUri,
  );

  await bank.start();

  await bank.pingUntilAvailable();

  exchange.addOfferedCoins(defaultCoinConfig);

  await exchange.start();
  await exchange.pingUntilAvailable();

  merchant.addExchange(exchange);

  await merchant.start();
  await merchant.pingUntilAvailable();

  await merchant.addInstanceWithWireAccount({
    id: "default",
    name: "Default Instance",
    paytoUris: [generateRandomPayto("merchant-default")],
  });

  await merchant.addInstanceWithWireAccount({
    id: "minst1",
    name: "minst1",
    paytoUris: [generateRandomPayto("minst1")],
  });

  console.log("setup done!");

  /*
   * =========================================================================
   * Check that the exchange can be added to the wallet
   * (without any faults active).
   * =========================================================================
   */

  const wallet = new WalletCli(t);

  let exchangesList: ExchangesListResponse;

  exchangesList = await wallet.client.call(
    WalletApiOperation.ListExchanges,
    {},
  );
  console.log("exchanges list:", j2s(exchangesList));
  t.assertTrue(exchangesList.exchanges.length === 0);

  // Try before fault is injected
  await wallet.client.call(WalletApiOperation.AddExchange, {
    exchangeBaseUrl: faultyExchange.baseUrl,
  });

  exchangesList = await wallet.client.call(
    WalletApiOperation.ListExchanges,
    {},
  );
  t.assertTrue(exchangesList.exchanges.length === 1);

  await wallet.client.call(WalletApiOperation.ListExchanges, {});

  console.log("listing exchanges");

  exchangesList = await wallet.client.call(
    WalletApiOperation.ListExchanges,
    {},
  );
  t.assertTrue(exchangesList.exchanges.length === 1);

  console.log("got list", exchangesList);

  /*
   * =========================================================================
   * Check what happens if the exchange returns something totally
   * bogus for /keys.
   * =========================================================================
   */

  wallet.deleteDatabase();

  exchangesList = await wallet.client.call(
    WalletApiOperation.ListExchanges,
    {},
  );
  t.assertTrue(exchangesList.exchanges.length === 0);

  faultyExchange.faultProxy.addFault({
    async modifyResponse(ctx: FaultInjectionResponseContext) {
      const url = new URL(ctx.request.requestUrl);
      if (url.pathname === "/keys") {
        const body = {
          version: "whaaat",
        };
        ctx.responseBody = Buffer.from(JSON.stringify(body), "utf-8");
      }
    },
  });

  const err1 = await t.assertThrowsTalerErrorAsync(async () => {
    await wallet.client.call(WalletApiOperation.AddExchange, {
      exchangeBaseUrl: faultyExchange.baseUrl,
    });
  });

  console.log("got error", err1);

  // Response is malformed, since it didn't even contain a version code
  // in a format the wallet can understand.
  t.assertTrue(
    err1.errorDetail.code === TalerErrorCode.WALLET_EXCHANGE_UNAVAILABLE,
  );

  exchangesList = await wallet.client.call(
    WalletApiOperation.ListExchanges,
    {},
  );
  console.log("exchanges list", j2s(exchangesList));
  t.assertTrue(exchangesList.exchanges.length === 1);
  t.assertTrue(
    exchangesList.exchanges[0].lastUpdateErrorInfo?.error.code ===
      TalerErrorCode.WALLET_RECEIVED_MALFORMED_RESPONSE,
  );

  /*
   * =========================================================================
   * Check what happens if the exchange returns an old, unsupported
   * version for /keys
   * =========================================================================
   */

  wallet.deleteDatabase();
  faultyExchange.faultProxy.clearAllFaults();

  faultyExchange.faultProxy.addFault({
    async modifyResponse(ctx: FaultInjectionResponseContext) {
      const url = new URL(ctx.request.requestUrl);
      if (url.pathname === "/keys") {
        const keys = ctx.responseBody?.toString("utf-8");
        t.assertTrue(keys != null);
        const keysJson = JSON.parse(keys);
        keysJson["version"] = "2:0:0";
        ctx.responseBody = Buffer.from(JSON.stringify(keysJson), "utf-8");
      }
    },
  });

  const err2 = await t.assertThrowsTalerErrorAsync(async () => {
    await wallet.client.call(WalletApiOperation.AddExchange, {
      exchangeBaseUrl: faultyExchange.baseUrl,
    });
  });

  t.assertTrue(err2.hasErrorCode(TalerErrorCode.WALLET_EXCHANGE_UNAVAILABLE));

  exchangesList = await wallet.client.call(
    WalletApiOperation.ListExchanges,
    {},
  );
  t.assertTrue(exchangesList.exchanges.length === 1);
  t.assertTrue(
    exchangesList.exchanges[0].lastUpdateErrorInfo?.error.code ===
      TalerErrorCode.WALLET_EXCHANGE_PROTOCOL_VERSION_INCOMPATIBLE,
  );

  /*
   * =========================================================================
   * Check that the exchange version is also checked when
   * the exchange is implicitly added via the suggested
   * exchange of a bank-integrated withdrawal.
   * =========================================================================
   */

  // Fault from above is still active!

  // Create withdrawal operation

  const bankClient = new TalerCorebankApiClient(bank.corebankApiBaseUrl);

  const user = await bankClient.createRandomBankUser();
  const wop = await bankClient.createWithdrawalOperation(
    user.username,
    "TESTKUDOS:10",
  );

  // Hand it to the wallet

  const wd = await wallet.client.call(
    WalletApiOperation.GetWithdrawalDetailsForUri,
    {
      talerWithdrawUri: wop.taler_withdraw_uri,
    },
  );

  // Make sure the faulty exchange isn't used for the suggestion.
  t.assertTrue(wd.possibleExchanges.length === 0);
}

runExchangeManagementFaultTest.suites = ["wallet", "exchange"];