/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 *
 * Any modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

/*
 * Licensed to Elasticsearch B.V. under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch B.V. licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import { AppMountParameters } from 'opensearch-dashboards/public';
import ReactDOM from 'react-dom';
import React from 'react';
import { createHashHistory } from 'history';
import { TodoAppPage } from './todo';

export interface AppOptions {
  appInstanceId: string;
  appTitle: string;
  historyType: History;
}

export enum History {
  Browser,
  Hash,
}

export const renderApp = (
  { appBasePath, element, history: platformHistory }: AppMountParameters,
  { appInstanceId, appTitle, historyType }: AppOptions
) => {
  const history = historyType === History.Browser ? platformHistory : createHashHistory();
  ReactDOM.render(
    <TodoAppPage
      history={history}
      appInstanceId={appInstanceId}
      appTitle={appTitle}
      appBasePath={appBasePath}
      isInitialRoute={() => {
        const stripTrailingSlash = (path: string) =>
          path.charAt(path.length - 1) === '/' ? path.substr(0, path.length - 1) : path;
        const currentAppUrl = stripTrailingSlash(history.createHref(history.location));
        if (historyType === History.Browser) {
          // browser history
          return currentAppUrl === '' && !history.location.search && !history.location.hash;
        } else {
          // hashed history
          return currentAppUrl === '#' && !history.location.search;
        }
      }}
    />,
    element
  );

  return () => ReactDOM.unmountComponentAtNode(element);
};
