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

// This dialog prompts the user for a phone number. 
// It will re-prompt the user if the input does not match a pattern for phone number.
bot.dialog('phonePrompt', [
    function (session, args) {
        if (args && args.reprompt) {
            builder.Prompts.text(session, "Enter the number using a format of either: '(555) 123-4567' or '555-123-4567' or '5551234567'")
        } else {
            builder.Prompts.text(session, "What's your phone number?");
        }
    },
    function (session, results) {
        var matched = results.response.match(/\d+/g);
        var number = matched ? matched.join('') : '';
        if (number.length == 10 || number.length == 11) {
            session.userData.phoneNumber = number; // Save the number.
            session.endDialogWithResult({ response: number });
        } else {
            // Repeat the dialog
            session.replaceDialog('phonePrompt', { reprompt: true });
        }
    }
]);