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

export function useComponentState(
  { amount: amountStr }: Props,
  api: typeof wxApi,
): State {
  const amount = Amounts.parseOrThrow(amountStr)

  const [subject, setSubject] = useState("");
  const [talerUri, setTalerUri] = useState("")
  const [operationError, setOperationError] = useState<TalerErrorDetail | undefined>(undefined)


  if (talerUri) {
    return {
      status: "show-qr",
      talerUri,
      error: undefined,
      close: () => { null },
    }
  }


  async function accept(): Promise<string> {
    try {

      const resp = await api.initiatePeerPushPayment({
        amount: Amounts.stringify(amount),
        partialContractTerms: {
          summary: subject
        }
      })
      return resp.talerUri
    } catch (e) {
      if (e instanceof TalerError) {
        setOperationError(e.errorDetail)
      }
      console.error(e)
      throw Error("error trying to accept")
    }
  }
  return {
    status: "ready",
    invalid: !subject || Amounts.isZero(amount),
    subject: {
      value: subject,
      onInput: async (e) => setSubject(e)
    },
    copyToClipboard: {
      onClick: async () => {
        const uri = await accept();
        navigator.clipboard.writeText(uri || "");
      }
    },
    showQr: {
      onClick: async () => {
        const uri = await accept();
        setTalerUri(uri)
      }
    },
    chosenAmount: amount,
    toBeReceived: amount,
    error: undefined,
    operationError
  }
}