// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License. See License.txt in the project root for license information.

import { TokenCredentialsBase } from "./tokenCredentialsBase";
import { Environment } from "@azure/ms-rest-azure-env";
import { AuthConstants, TokenAudience } from "../util/authConstants";
import { TokenResponse, TokenCache } from "adal-node";

export class DeviceTokenCredentials extends TokenCredentialsBase {
  readonly username: string;

  /**
   * Creates a new DeviceTokenCredentials object that gets a new access token using userCodeInfo (contains user_code, device_code)
   * for authenticating user on device.
   *
   * When this credential is used, the script will provide a url and code. The user needs to copy the url and the code, paste it
   * in a browser and authenticate over there. If successful, the script will get the access token.
   *
   *
   * @param clientId - The active directory application client id.
   * @param domain - The domain or tenant id containing this application. Default value is "common"
   * @param username - The user name for account in the form: "user@example.com".
   * @param tokenAudience - The audience for which the token is requested. Valid values are 'graph', 'batch', or any other resource like 'https://vault.azure.net/'.
   * If tokenAudience is 'graph' then domain should also be provided and its value should not be the default 'common' tenant. It must be a string (preferrably in a guid format).
   * See {@link https://azure.microsoft.com/en-us/documentation/articles/active-directory-devquickstarts-dotnet/ Active Directory Quickstart for .Net}
   * for an example.
   * @param environment - The azure environment to authenticate with. Default environment is "Azure" popularly known as "Public Azure Cloud".
   * @param tokenCache - The token cache. Default value is the MemoryCache object from adal.
   */
  public constructor(
    clientId?: string,
    domain?: string,
    username?: string,
    tokenAudience?: TokenAudience,
    environment?: Environment,
    tokenCache?: TokenCache
  ) {
    if (!username) {
      username = "user@example.com";
    }

    if (!domain) {
      domain = AuthConstants.AAD_COMMON_TENANT;
    }

    if (!clientId) {
      clientId = AuthConstants.DEFAULT_ADAL_CLIENT_ID;
    }

    super(clientId, domain, tokenAudience, environment, tokenCache);

    this.username = username;
  }

  public getToken(): Promise<TokenResponse> {
    // For device auth, this is just getTokenFromCache.
    return this.getTokenFromCache(this.username);
  }
}