/*
 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 {
  KnownBankAccountsInfo,
  parsePaytoUri,
  stringifyPaytoUri,
} from "@gnu-taler/taler-util";
import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
import { useState } from "preact/hooks";
import { alertFromError, useAlertContext } from "../../context/alert.js";
import { useBackendContext } from "../../context/backend.js";
import { useTranslationContext } from "@gnu-taler/web-util/browser";
import { useAsyncAsHook } from "../../hooks/useAsyncAsHook.js";
import { AccountByType, Props, State } from "./index.js";
import { useSettings } from "../../hooks/useSettings.js";

export function useComponentState({
  currency,
  onAccountAdded,
  onCancel,
}: Props): State {
  const api = useBackendContext();
  const { pushAlertOnError } = useAlertContext();
  const { i18n } = useTranslationContext();
  const hook = useAsyncAsHook(() =>
    api.wallet.call(WalletApiOperation.ListKnownBankAccounts, { currency }),
  );
  const accountType: Record<string, string> = {
    iban: "IBAN",
  };
  const [settings] = useSettings();
  if (settings.extendedAccountTypes) {
    accountType["bitcoin"] = "Bitcoin";
    accountType["x-taler-bank"] = "Taler Bank";
  }

  const [payto, setPayto] = useState("");
  const [alias, setAlias] = useState("");
  const [type, setType] = useState("iban");

  if (!hook) {
    return {
      status: "loading",
      error: undefined,
    };
  }
  if (hook.hasError) {
    return {
      status: "error",
      error: alertFromError(
        i18n,
        i18n.str`Could not load known bank accounts`,
        hook),
    };
  }

  const uri = parsePaytoUri(payto);
  const found =
    hook.response.accounts.findIndex(
      (a) => stringifyPaytoUri(a.uri) === payto,
    ) !== -1;

  async function addAccount(): Promise<void> {
    if (!uri || found) return;

    const normalizedPayto = stringifyPaytoUri(uri);
    await api.wallet.call(WalletApiOperation.AddKnownBankAccounts, {
      alias,
      currency,
      payto: normalizedPayto,
    });
    onAccountAdded(payto);
  }

  const paytoUriError = found ? "that account is already present" : undefined;

  const unableToAdd =
    !type || !alias || paytoUriError !== undefined || uri === undefined;

  const accountByType: AccountByType = {
    iban: [],
    bitcoin: [],
    "x-taler-bank": [],
  };

  hook.response.accounts.forEach((acc) => {
    accountByType[acc.uri.targetType].push(acc);
  });

  async function deleteAccount(account: KnownBankAccountsInfo): Promise<void> {
    const payto = stringifyPaytoUri(account.uri);
    await api.wallet.call(WalletApiOperation.ForgetKnownBankAccounts, {
      payto,
    });
    hook?.retry();
  }

  return {
    status: "ready",
    error: undefined,
    currency,
    accountType: {
      list: accountType,
      value: type,
      onChange: pushAlertOnError(async (v) => {
        setType(v);
      }),
    },
    alias: {
      value: alias,
      onInput: pushAlertOnError(async (v) => {
        setAlias(v);
      }),
    },
    uri: {
      value: payto,
      error: paytoUriError,
      onInput: pushAlertOnError(async (v) => {
        setPayto(v);
      }),
    },
    accountByType,
    deleteAccount: pushAlertOnError(deleteAccount),
    onAccountAdded: {
      onClick: unableToAdd ? undefined : pushAlertOnError(addAccount),
    },
    onCancel: {
      onClick: pushAlertOnError(async () => onCancel()),
    },
  };
}