module.exports = function(context, cb) {
    'use strict';
    //telegram
    const TOKEN = context.secrets.bot_token;
    const TelegramBot = require('node-telegram-bot-api');
    const bot = new TelegramBot(TOKEN);
    //bot.setWebHook('https://wt-fb95a52ccc1baaa2f9876a683e6b1325-0.sandbox.auth0-extend.com/vong_inline');
    //apiai
    const apiai = require('apiai');
    const app = apiai(context.secrets.Dialogflow_APIKEY);
  
    //messages
    bot.on('message', function onMessage(msg) {
      let bild = msg.text.match(/\/bild (.+)/);
      let vong = msg.text.match(/\/vong (.+)/);
      if (bild !== null) {
        var request = app.textRequest('zeig mir das bild von ' + bild[1], {
          sessionId: Math.floor(Math.random() * 100000000)
        });
      } else if (vong !== null) {
        var request = app.textRequest('übersetze ' + vong[1], {
          sessionId: Math.floor(Math.random() * 100000000)
        });
      } else {
        //Dialoglfow
        var request = app.textRequest(msg.text, {
          sessionId: msg.chat.id
        });
      }
  
      request.on('response', function(response) {
        console.log(response);
        let txt = response.result.fulfillment.messages[0].speech,
          m = response.result.fulfillment.messages;
        if (m.length > 1) {
          return bot.sendPhoto(msg.chat.id, m[1].imageUrl);
        } else {
          if (txt !== '') {
            return bot.sendMessage(msg.chat.id, txt);
          }
        }
      });
  
      request.on('error', function(error) {
        console.error(error);
      });
  
      request.end();
    });
  
    //inline
    bot.on('inline_query', function(msg) {
      let answers = [];
      let query = msg.query;
  
      //Dialogflow - vong-bild
      const vong_bild = app.textRequest("zeige mir ein bild von " + query, {
        sessionId: Math.floor(Math.random() * 100000000)
      });
      vong_bild.on('response', dfSuccess);
      vong_bild.on('error', dfError);
      vong_bild.end();
  
      function dfSuccess(response) {
        let txt = response.result.fulfillment.messages[0].speech,
          m = response.result.fulfillment.messages;
        if (m.length > 1) {
          answers.push({
            type: 'photo',
            id: 'photo',
            photo_url: m[1].imageUrl,
            thumb_url: m[1].imageUrl
          });
        }
        answers.push({
          type: 'article',
          id: 'query',
          title: 'Übersetzung',
          description: txt,
          message_text: txt
        });
        return bot.answerInlineQuery(msg.id, answers);
      }
  
      function dfError(error) {
        console.error(error);
      }
    });
  
    bot.processUpdate(context.body);
    cb(null, null);
  };