/*
 This file is part of GNU Taler
 (C) 2021 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/>
 */

/**
*
* @author Sebastian Javier Marchano (sebasjm)
*/

import { h, VNode } from 'preact';
import { route } from 'preact-router';
import { useMemo } from "preact/hooks";
import { ApplicationReadyRoutes } from "./ApplicationReadyRoutes.js";
import { Loading } from "./components/exception/loading.js";
import { NotificationCard, NotYetReadyAppMenu } from "./components/menu/index.js";
import { BackendContextProvider, useBackendContext } from './context/backend.js';
import { ConfigContextProvider } from './context/config.js';
import { TranslationProvider } from './context/translation.js';
import { useBackendConfig } from "./hooks/backend.js";
import { useTranslator } from './i18n/index.js';
import LoginPage from './paths/login/index.js';
import "./scss/main.scss";

export default function Application(): VNode {
  return (
    // <FetchContextProvider>
      <BackendContextProvider>
        <TranslationProvider>
          <ApplicationStatusRoutes />
        </TranslationProvider>
      </BackendContextProvider>
    // </FetchContextProvider>
  );
}

function ApplicationStatusRoutes(): VNode {
  const { updateLoginStatus, triedToLog } = useBackendContext()
  const result = useBackendConfig();
  const i18n = useTranslator()

  const updateLoginInfoAndGoToRoot = (url: string, token?: string) => {
    updateLoginStatus(url, token)
    route('/')
  }

  const { currency, version } = result.ok ? result.data : { currency: 'unknown', version: 'unknown' }
  const ctx = useMemo(() => ({ currency, version }), [currency, version])

  if (!triedToLog) {
    return <div id="app">
      <NotYetReadyAppMenu title="Welcome!" />
      <LoginPage onConfirm={updateLoginInfoAndGoToRoot} />
    </div>
  }

  if (result.clientError && result.isUnauthorized) return <div id="app">
    <NotYetReadyAppMenu title="Login" />
    <LoginPage onConfirm={updateLoginInfoAndGoToRoot} />
  </div>

  if (result.clientError && result.isNotfound) return <div id="app">
    <NotYetReadyAppMenu title="Error" />
    <NotificationCard notification={{
      message: i18n`Server not found`,
      type: 'ERROR',
      description: `Check your url`,
    }} />
    <LoginPage onConfirm={updateLoginInfoAndGoToRoot} />
  </div>

  if (result.serverError) return <div id="app">
    <NotYetReadyAppMenu title="Error" />
    <NotificationCard notification={{
      message: i18n`Couldn't access the server`,
      type: 'ERROR',
      description: i18n`Got message ${result.message} from ${result.info?.url}`,
    }} />
    <LoginPage onConfirm={updateLoginInfoAndGoToRoot} />
  </div>

  if (result.loading) return <Loading />

  if (!result.ok) return <div id="app">
    <NotYetReadyAppMenu title="Error" />
    <NotificationCard notification={{
      message: i18n`Unexpected Error`,
      type: 'ERROR',
      description: i18n`Got message ${result.message} from ${result.info?.url}`,
    }} />
    <LoginPage onConfirm={updateLoginInfoAndGoToRoot} />
  </div>

  return <div id="app" class="has-navbar-fixed-top">
    <ConfigContextProvider value={ctx}>
      <ApplicationReadyRoutes />
    </ConfigContextProvider>
  </div>
}