/* global document */
/* eslint-disable complexity, max-statements */
/*!
 * Copyright (c) 2015-present, Okta, Inc. and/or its affiliates. All rights reserved.
 * The Okta software accompanied by this notice is provided pursuant to the Apache License, Version 2.0 (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 {
  addPostMessageListener,
  getAuthorizeUrl,
  getOAuthUrls,
  loadFrame,
  prepareTokenParams
} from './util';

import AuthSdkError from '../errors/AuthSdkError';

import {
  OktaAuthOAuthInterface,
  TokenParams,
  PopupParams,
  OAuthResponse,
} from './types';

import { handleOAuthResponse } from './handleOAuthResponse';
/*
 * Retrieve an idToken from an Okta or a third party idp
 *
 * Two main flows:
 *
 *  1) Exchange a sessionToken for a token
 *
 *    Required:
 *      clientId: passed via the OktaAuth constructor or into getToken
 *      sessionToken: 'yourtoken'
 *
 *    Optional:
 *      redirectUri: defaults to window.location.href
 *      scopes: defaults to ['openid', 'email']
 *
 *    Forced:
 *      prompt: 'none'
 *      responseMode: 'okta_post_message' (WIC/CIS) | 'web_message' (CIC)
 *      display: undefined
 *
 *  2) Get a token from an idp
 *
 *    Required:
 *      clientId: passed via the OktaAuth constructor or into getToken
 *
 *    Optional:
 *      redirectUri: defaults to window.location.href
 *      scopes: defaults to ['openid', 'email']
 *      idp: defaults to Okta as an idp
 *      prompt: no default. Pass 'none' to throw an error if user is not signed in
 *
 *    Forced:
 *      display: 'popup'
 *
 *  Only common optional params shown. Any OAuth parameters not explicitly forced are available to override
 *
 * @param {Object} oauthOptions
 * @param {String} [oauthOptions.clientId] ID of this client
 * @param {String} [oauthOptions.redirectUri] URI that the iframe or popup will go to once authenticated
 * @param {String[]} [oauthOptions.scopes] OAuth 2.0 scopes to request (openid must be specified)
 * @param {String} [oauthOptions.idp] ID of an external IdP to use for user authentication
 * @param {String} [oauthOptions.sessionToken] Bootstrap Session Token returned by the Okta Authentication API
 * @param {String} [oauthOptions.prompt] Determines whether the Okta login will be displayed on failure.
 *                                       Use 'none' to prevent this behavior
 *
 * @param {Object} options
 * @param {Integer} [options.timeout] Time in ms before the flow is automatically terminated. Defaults to 120000
 * @param {String} [options.popupTitle] Title dispayed in the popup.
 *                                      Defaults to 'External Identity Provider User Authentication'
 */
export async function getToken(sdk: OktaAuthOAuthInterface, options: TokenParams & PopupParams) {
  if (arguments.length > 2) {
    return Promise.reject(new AuthSdkError('As of version 3.0, "getToken" takes only a single set of options'));
  }

  options = options || {};

  // window object cannot be serialized, save for later use
  // TODO: move popup related params into a separate options object
  const popupWindow = options.popupWindow;
  options.popupWindow = undefined;

  const tokenParams = await prepareTokenParams(sdk, options);

  // Start overriding any options that don't make sense
  const sessionTokenOverrides = {
    prompt: 'none',
    responseMode: sdk?.options?.provider === 'okta-cic' ? 'web_message' : 'okta_post_message',
    display: null
  };

  const idpOverrides = {
    display: 'popup'
  };

  if (options.sessionToken) {
    Object.assign(tokenParams, sessionTokenOverrides);
  } else if (options.idp) {
    Object.assign(tokenParams, idpOverrides);
  }

  // Use the query params to build the authorize url
  // Get authorizeUrl and issuer
  const urls = getOAuthUrls(sdk, tokenParams);
  const endpoint = options.codeVerifier ? urls.tokenUrl : urls.authorizeUrl;

  const requestUrl = await getAuthorizeUrl(sdk, tokenParams, endpoint);

  // Determine the flow type
  var flowType: 'IFRAME' | 'POPUP' | 'IMPLICIT';

  if (tokenParams.sessionToken || tokenParams.display === null) {
    flowType = 'IFRAME';
  } else if (tokenParams.display === 'popup') {
    flowType = 'POPUP';
  } else {
    flowType = 'IMPLICIT';
  }

  // Execute the flow type
  switch (flowType) {
    case 'IFRAME':
      var iframePromise = addPostMessageListener(sdk, options.timeout, tokenParams.state);
      var iframeEl = loadFrame(requestUrl);
      return iframePromise
        .then(function (res) {
          if (!res) {

            throw new AuthSdkError('Did not receive a valid OAuthResponse');
          }
          return handleOAuthResponse(sdk, tokenParams, res as OAuthResponse, urls);
        })
        .finally(function () {
          if (document.body.contains(iframeEl)) {
            iframeEl.parentElement?.removeChild(iframeEl);
          }
        });

    case 'POPUP':
      var oauthPromise: Promise<OAuthResponse | undefined>; // resolves with OAuth response

      // Add listener on postMessage before window creation, so
      // postMessage isn't triggered before we're listening
      if (tokenParams?.responseMode && ['okta_post_message', 'web_message'].includes(tokenParams.responseMode)) {
        if (!sdk.features.isPopupPostMessageSupported()) {
          throw new AuthSdkError('This browser doesn\'t have full postMessage support');
        }
        oauthPromise = addPostMessageListener(sdk, options.timeout, tokenParams.state);
      }

      // Redirect for authorization
      // popupWindow can be null when popup is blocked
      if (popupWindow) {
        popupWindow.location.assign(requestUrl);
      }

      // The popup may be closed without receiving an OAuth response. Setup a poller to monitor the window.
      var popupPromise: Promise<OAuthResponse | undefined> = new Promise(function (resolve, reject) {
        var closePoller = setInterval(function () {
          if (!popupWindow || popupWindow.closed) {
            clearInterval(closePoller);
            reject(new AuthSdkError('Unable to parse OAuth flow response'));
          }
        }, 100);

        // Proxy the OAuth promise results
        oauthPromise
          .then(function (res) {
            clearInterval(closePoller);
            resolve(res);
          })
          .catch(function (err) {
            clearInterval(closePoller);
            reject(err);
          });
      });

      return popupPromise
        .then(function (res) {
          if (!res) {
            throw new AuthSdkError('Did not receive a valid OAuthResponse');
          }
          return handleOAuthResponse(sdk, tokenParams, res, urls);
        })
        .finally(function () {
          if (popupWindow && !popupWindow.closed) {
            popupWindow.close();
          }
        });

    default:
      throw new AuthSdkError('The full page redirect flow is not supported');
  }
}