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//See: https://github.com/stevengum97/LoopPrompt_Example
//Demonstration of session.replaceDialog() to incorporate a looping aspect when delivering an unspecified number of Prompts to the user.

var builder = require('botbuilder');
var restify = require('restify');

var server = restify.createServer();

server.listen(process.env.port || process.env.PORT || 3978, function () {
    console.log('%s listening to %s', server.name, server.url);

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https://github.com/pveller/ecommerce-chatbot

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// Anytime the major version is incremented any existing conversations will be restarted.
bot.use(builder.Middleware.dialogVersion({ version: 1.0, resetCommand: /^reset/i }));

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//See: https://github.com/DanielEgan/botstarter

SAMPLE CODE FROM: botstarter/server.js
...
let fs = require('fs');
let path = require('path');
let readdir = require('readdir-enhanced');
...
let bot = new builder.UniversalBot(connector, function (session) {
    session.beginDialog('/default');

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// See: https://github.com/Microsoft/BotBuilder/issues/2456

// Install a custom recognizer to look for user saying 'help' or 'goodbye'.

// Set the recognizeOrder to 'series', use RegExpRecognizers and the LuisRecognizer
// Using 'series' stops the service checking Luis if the Hello or Hi recognizers return a positive
// Without 'series', all of the recognizers including Luis are checked

var recognizer = new builder.LuisRecognizer(model);
var regExHi = new builder.RegExpRecognizer('Hi', /^hi$/i); 

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// See: http://www.pveller.com/smarter-conversations-part-2-open-dialogs/#Trigger-Actions
// You can define your own dialog’s behaviors by overwriting begin, replyReceived, and even recognize on your dialogs:
bot.dialog('custom', Object.assign(new builder.Dialog(), {
    begin: (session) => {
        session.send('I am built custom');
    },
    replyReceived: (session) => {
        session.endDialog();
    }
}));

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//See: https://stackoverflow.com/questions/40437773/how-do-i-define-the-default-behaviors-of-a-bot-in-node-js

To change the default error messages, we can simply add a file called 'BotBuilder.json' inside the folder

BotProject/locale/<languageCode>/BotBuilder.json
So the file contains the text message which override the default error as follows:

{
    "default_text": "I didn't understand. Please try again.",
    "default_number": "I didn't recognize that as a number. Please enter a number.",

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HELPERS.JS

module.exports = function () {

     /**
     * Returns a random integer between min (inclusive) and max (inclusive)
     * Using Math.round() will give you a non-uniform distribution!
     */
    global.getRandomInt = function (min, max) {
        return Math.floor(Math.random() * (max - min + 1)) + min;

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//See: https://docs.microsoft.com/en-us/bot-framework/nodejs/bot-builder-nodejs-dialog-actions

// Order dinner.
bot.dialog('orderDinner', [
    //...waterfall steps...
])
// Once triggered, will restart the dialog.
.reloadAction('startOver', 'Ok, starting over.', {
    matches: /^start over$/i
});

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// See:https://github.com/Microsoft/BotBuilder-Samples/blob/master/Node/core-MultiDialogs/README.md
// also: https://github.com/Microsoft/BotBuilder/issues/1710

Handling dialog errors

Errors can be signaled from child dialogs using session.error. This will signal the error via an on('error', err) event, for both the bot object and the session object. In flights.js we are signalling an error which the parent dialog handles using session.on('error'), as shown in app.js:

session.on('error', function (err) {
    session.send('Failed with message: %s', err.message);
    session.endDialog();