/*
 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, TalerErrorDetail, TalerProtocolTimestamp } from "@gnu-taler/taler-util";
import { TalerError } from "@gnu-taler/taler-wallet-core";
import { 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 }: Props,
  api: typeof wxApi,
): State {
  const hook = useAsyncAsHook(async () => {
    return await api.checkPeerPullPayment({
      talerUri: talerPayPullUri
    })
  }, [])
  const [operationError, setOperationError] = useState<TalerErrorDetail | undefined>(undefined)

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

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

  const amount: string = contractTerms?.amount
  const summary: string | undefined = contractTerms?.summary
  const expiration: TalerProtocolTimestamp | undefined = contractTerms?.purse_expiration

  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",
    amount: Amounts.parseOrThrow(amount),
    error: undefined,
    accept: {
      onClick: accept
    },
    summary,
    expiration: expiration ? AbsoluteTime.fromTimestamp(expiration) : undefined,
    cancel: {
      onClick: onClose
    },
    operationError
  }
}