wallet-core/packages/taler-wallet-webextension/src/cta/InvoicePay/state.ts

/*
 This file is part of GNU Taler
 (C) 2022 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/>
 */

import { AbsoluteTime, Amounts, NotificationType, PreparePayResult, PreparePayResultType, TalerErrorDetail, TalerProtocolTimestamp } from "@gnu-taler/taler-util";
import { TalerError } from "@gnu-taler/taler-wallet-core";
import { useEffect, useState } from "preact/hooks";
import { useAsyncAsHook } from "../../hooks/useAsyncAsHook.js";
import * as wxApi from "../../wxApi.js";
import { Props, State } from "./index.js";

export function useComponentState(
  { talerPayPullUri, onClose, goToWalletManualWithdraw }: Props,
  api: typeof wxApi,
): State {
  const hook = useAsyncAsHook(async () => {
    const p2p = await api.checkPeerPullPayment({
      talerUri: talerPayPullUri
    })
    const balance = await api.getBalance();
    return { p2p, balance }
  })

  useEffect(() => {
    api.onUpdateNotification([NotificationType.CoinWithdrawn], () => {
      hook?.retry();
    });
  });

  const [operationError, setOperationError] = useState<TalerErrorDetail | undefined>(undefined)

  if (!hook) {
    return {
      status: "loading",
      error: undefined,
    }
  }
  if (hook.hasError) {
    return {
      status: "loading-uri",
      error: hook,
    };
  }

  // const { payStatus } = hook.response.p2p;

  const { amount: purseAmount, contractTerms, peerPullPaymentIncomingId } = hook.response.p2p


  const amountStr: string = contractTerms?.amount
  const amount = Amounts.parseOrThrow(amountStr)
  const summary: string | undefined = contractTerms?.summary
  const expiration: TalerProtocolTimestamp | undefined = contractTerms?.purse_expiration

  const foundBalance = hook.response.balance.balances.find(
    (b) => Amounts.parseOrThrow(b.available).currency === amount.currency,
  );

  const paymentPossible: PreparePayResult = {
    status: PreparePayResultType.PaymentPossible,
    proposalId: "fakeID",
    contractTerms: {
    } as any,
    contractTermsHash: "asd",
    amountRaw: hook.response.p2p.amount,
    amountEffective: hook.response.p2p.amount,
    noncePriv: "",
  } as PreparePayResult

  const insufficientBalance: PreparePayResult = {
    status: PreparePayResultType.InsufficientBalance,
    proposalId: "fakeID",
    contractTerms: {
    } as any,
    amountRaw: hook.response.p2p.amount,
    noncePriv: "",
  }


  const baseResult = {
    uri: talerPayPullUri,
    cancel: {
      onClick: onClose
    },
    amount,
    goToWalletManualWithdraw,
    summary,
    expiration: expiration ? AbsoluteTime.fromTimestamp(expiration) : undefined,
    operationError,
  }

  if (!foundBalance) {
    return {
      status: "no-balance-for-currency",
      error: undefined,
      balance: undefined,
      ...baseResult,
      payStatus: insufficientBalance,
    }
  }

  const foundAmount = Amounts.parseOrThrow(foundBalance.available);

  //FIXME: should use pay result type since it check for coins exceptions
  if (Amounts.cmp(foundAmount, amount) < 0) { //payStatus.status === PreparePayResultType.InsufficientBalance) {
    return {
      status: 'no-enough-balance',
      error: undefined,
      balance: foundAmount,
      ...baseResult,
      payStatus: insufficientBalance,
    }
  }

  // if (payStatus.status === PreparePayResultType.AlreadyConfirmed) {
  //   return {
  //     status: "confirmed",
  //     balance: foundAmount,
  //     ...baseResult,
  //   };
  // }

  async function accept(): Promise<void> {
    try {
      const resp = await api.acceptPeerPullPayment({
        peerPullPaymentIncomingId
      })
      await onClose()
    } catch (e) {
      if (e instanceof TalerError) {
        setOperationError(e.errorDetail)
      }
      console.error(e)
      throw Error("error trying to accept")
    }
  }


  return {
    status: "ready",
    error: undefined,
    ...baseResult,
    payStatus: paymentPossible,
    balance: foundAmount,
    accept: {
      onClick: accept
    },
  }
}