/*
 This file is part of GNU Taler
 (C) 2022-2024 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 { AmountJson, Amounts, TalerExchangeApi } from "@gnu-taler/taler-util";
import { StringConverter } from "@gnu-taler/web-util/browser";

export const amlStateConverter = {
  toStringUI: stringifyAmlState,
  fromStringUI: parseAmlState,
};

function stringifyAmlState(s: TalerExchangeApi.AmlState | undefined): string {
  if (s === undefined) return "";
  switch (s) {
    case TalerExchangeApi.AmlState.normal:
      return "normal";
    case TalerExchangeApi.AmlState.pending:
      return "pending";
    case TalerExchangeApi.AmlState.frozen:
      return "frozen";
  }
}

function parseAmlState(s: string | undefined): TalerExchangeApi.AmlState {
  switch (s) {
    case "normal":
      return TalerExchangeApi.AmlState.normal;
    case "pending":
      return TalerExchangeApi.AmlState.pending;
    case "frozen":
      return TalerExchangeApi.AmlState.frozen;
    default:
      throw Error(`unknown AML state: ${s}`);
  }
}

const amountConverter: StringConverter<AmountJson> = {
  fromStringUI(v: string | undefined): AmountJson {
    // FIXME: requires currency
    return Amounts.parse(`NETZBON:${v}`) ?? Amounts.zeroOfCurrency("NETZBON");
  },
  toStringUI(v: unknown): string {
    return v === undefined ? "" : Amounts.stringifyValue(v as AmountJson);
  },
};

export function getConverterById(id: string | undefined): StringConverter<unknown> {
  if (id === "Taler.Amount") {
    // @ts-expect-error check this
    return amountConverter;
  }
  if (id === "TalerExchangeApi.AmlState") {
    // @ts-expect-error check this
    return amlStateConverter;
  }
  return undefined!;
}