text: // Copyright (c) Microsoft Corporation. All rights reserved.
  // Licensed under the MIT License.
  
  // index.js is used to setup and configure your bot
  
  // Import required pckages
  const path = require('path');
  
  // Read botFilePath and botFileSecret from .env file.
  const ENV_FILE = path.join(__dirname, '.env');
  require('dotenv').config({ path: ENV_FILE });
  
  const restify = require('restify');
  
  // Import required bot services.
  // See https://aka.ms/bot-services to learn more about the different parts of a bot.
  const {
      CloudAdapter,
      ConfigurationServiceClientCredentialFactory,
      createBotFrameworkAuthenticationFromConfiguration
  } = require('botbuilder');
  const { TeamsMessagingExtensionsActionPreviewBot } = require('./bots/teamsMessagingExtensionsActionPreviewBot');
  
  const credentialsFactory = new ConfigurationServiceClientCredentialFactory({
      MicrosoftAppId: process.env.MicrosoftAppId,
      MicrosoftAppPassword: process.env.MicrosoftAppPassword,
      MicrosoftAppType: process.env.MicrosoftAppType,
      MicrosoftAppTenantId: process.env.MicrosoftAppTenantId
  });
  
  const botFrameworkAuthentication = createBotFrameworkAuthenticationFromConfiguration(null, credentialsFactory);
  
  // Create adapter.
  // See https://aka.ms/about-bot-adapter to learn more about how bots work.
  const adapter = new CloudAdapter(botFrameworkAuthentication);
  
  adapter.onTurnError = async (context, error) => {
      // This check writes out errors to console log .vs. app insights.
      // NOTE: In production environment, you should consider logging this to Azure
      //       application insights. See https://aka.ms/bottelemetry for telemetry
      //       configuration instructions.
      console.error(`\n [onTurnError] unhandled error: ${ error }`);
  
      // Send a trace activity, which will be displayed in Bot Framework Emulator
      await context.sendTraceActivity(
          'OnTurnError Trace',
          `${ error }`,
          'https://www.botframework.com/schemas/error',
          'TurnError'
      );
  
      // Send a message to the user
      await context.sendActivity('The bot encountered an error or bug.');
      await context.sendActivity('To continue to run this bot, please fix the bot source code.');
  };
  
  // Create the bot that will handle incoming messages.
  const bot = new TeamsMessagingExtensionsActionPreviewBot();
  
  // Create HTTP server.
  const server = restify.createServer();
  server.use(restify.plugins.bodyParser());
  
  server.listen(process.env.port || process.env.PORT || 3978, function() {
      console.log(`\n${ server.name } listening to ${ server.url }`);
  });
  
  // Listen for incoming requests.
  server.post('/api/messages', async (req, res) => {
      // Route received a request to adapter for processing
      await adapter.process(req, res, (context) => bot.run(context));
  });
  