var dialogflow = require('dialogflow');
var nodemailer = require('nodemailer');

var mailPassword = 'ksystem15';
var mailSMTPSever = 'mail.cloud13.de';
var transporter = nodemailer.createTransport({
    host: mailSMTPSever,
    port: 587,
    secure: false,
    auth: {
        user: mailAccountName,
        pass: mailPassword
    },
    tls: {
        // do not fail on invalid certs
        rejectUnauthorized: false
    }
});

//Google
var sessionId = 1;
const projectId = 'accelerator-chatbot';
const languageCode = 'de-DE';

const chatBotError = "\n WARNING: Chatbot not working because no GOOGLE_APPLICATION_CREDENTIALS env variable set! To fix it, run this in your command line:\n Win: set GOOGLE_APPLICATION_CREDENTIALS=Accelerator-Chatbot-b863bdff37fd.json\n Linux: GOOGLE_APPLICATION_CREDENTIALS=Accelerator-Chatbot-b863bdff37fd.json\n";
if(!process.env.GOOGLE_APPLICATION_CREDENTIALS) {
        console.log(chatBotError);
}

module.exports = {
        chat1 : function(msg, username, callback) {
                if(!process.env.GOOGLE_APPLICATION_CREDENTIALS) {
                        console.log(chatBotError);
                        return;
                }
                chtext = msg.split("/cb ")[1];
                if(chtext && chtext != "") {
                        var sessionId = username+(sessionId++);
                        const sessionClient = new dialogflow.SessionsClient();
                        var session = sessionClient.sessionPath(projectId, sessionId);

                        // The text query request.
                        const request = {
                          session: session,
                          queryInput: {
                            text: {
                              text: chtext,
                              languageCode: languageCode,
                            },
                          },
                        };

                        // Send request and log result
                        sessionClient
                          .detectIntent(request)
                          .then(responses => {
                            console.log('Detected intent');
                            const result = responses[0].queryResult;
                            console.log(`  Query: ${result.queryText}`);
                            console.log(`  Response: ${result.fulfillmentText}`);
                            if(result.intent.displayName=="Email...") {
                                    transporter.sendMail({
                            from: mailAccountName,
                            to:   chtext.split("/cb ")[1],
                            subject: "Accelerator Invitation",
                            text: SENDMESSAGETEXT
                        },
                        function(err,response){
                            if(err){
                                callback("ERROR","chatbot", username, result.intent.displayName);
                            }
                            callback(result.fulfillmentText,"chatbot", username, result.intent.displayName);
                        });
                            } else {
                                    callback(result.fulfillmentText,"chatbot", username, result.intent.displayName);
                            }

                            if (result.intent) {
                              console.log(`  Intent: ${result.intent.displayName}`);
                            } else {
                              console.log(`  No intent matched.`);
                            }
                          })
                          .catch(err => {
                            console.error('ERROR:', err);
                          });
                }
        }
}