/*
 This file is part of GNU Taler
 (C) 2021-2024 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 { HttpStatusCode, TalerError, assertUnreachable } from "@gnu-taler/taler-util";
import { useMerchantApiContext, useTranslationContext } from "@gnu-taler/web-util/browser";
import { Fragment, VNode, h } from "preact";
import { useState } from "preact/hooks";
import { ErrorLoadingMerchant } from "../../../components/ErrorLoadingMerchant.js";
import { Loading } from "../../../components/exception/loading.js";
import { NotificationCard } from "../../../components/menu/index.js";
import { useSessionContext } from "../../../context/session.js";
import { useInstanceDetails } from "../../../hooks/instance.js";
import { Notification } from "../../../utils/types.js";
import { LoginPage } from "../../login/index.js";
import { DetailPage } from "./DetailPage.js";
import { NotFoundPageOrAdminCreate } from "../../notfound/index.js";

interface Props {
  onChange: () => void;
  onCancel: () => void;
}

export default function Token({
  onChange,
  onCancel,
}: Props): VNode {
  const { i18n } = useTranslationContext();
  const { lib } = useMerchantApiContext();
  const { logIn } = useSessionContext();
  const [notif, setNotif] = useState<Notification | undefined>(undefined);
  const result = useInstanceDetails()

  if (!result) return <Loading />
  if (result instanceof TalerError) {
    return <ErrorLoadingMerchant error={result} />
  }
  if (result.type === "fail") {
    switch(result.case) {
      case HttpStatusCode.Unauthorized: {
        return <LoginPage />
      }
      case HttpStatusCode.NotFound: {
        return <NotFoundPageOrAdminCreate />;
      }
      default: {
        assertUnreachable(result)
      }
    }
  }

  const hasToken = result.body.auth.method === "token"

  return (
    <Fragment>
      <NotificationCard notification={notif} />
      <DetailPage
        onBack={onCancel}
        hasToken={hasToken}
        onClearToken={async (currentToken): Promise<void> => {
          try {
            await lib.instance.updateCurrentInstanceAuthentication(currentToken, {
              method: "external",
            })
            onChange();
          } catch (error) {
            if (error instanceof Error) {
              setNotif({
                message: i18n.str`Failed to clear token`,
                type: "ERROR",
                description: error.message,
              });
            }
          }
        }}
        onNewToken={async (currentToken, newToken): Promise<void> => {
          try {
            await lib.instance.updateCurrentInstanceAuthentication(currentToken, {
              token: newToken,
              method: "token"
            })
            const resp = await lib.authenticate.createAccessTokenBearer(newToken, {
              scope: "write",
              duration: {
                d_us: "forever"
              },
              refreshable: true,
            })
            if (resp.type === "ok") {
              logIn({ token: resp.body.token })
              onChange();
            } else {
              setNotif({
                message: i18n.str`Failed to set new token`,
                type: "ERROR",
              });
            }
          } catch (error) {
            if (error instanceof Error) {
              setNotif({
                message: i18n.str`Failed to set new token`,
                type: "ERROR",
                description: error.message,
              });
            }
          }
        }}
      />
    </Fragment>
  );
}