interactive.ts

import readline = require("readline");
import handlers = require("./handlers");
import open = require("open");

let instance: Interactive = null;

class Interactive {
  currentVolunteer: number;
  interface: readline.ReadLine;
  buttons: Array<any>; // TODO: create type definitions for messenger-bot

  constructor() {
    if (!instance) {
      instance = this;
    }
    this.currentVolunteer = (process.env.FBID || 1);
    this.interface = readline.createInterface({
      input: process.stdin,
      output: process.stdout,
    });
    this.setPrompt();
    this.buttons = [];

    return instance;
  }

  sendMessage(id, message) {
    let text = message.text;
    if (!text && message.attachment && message.attachment.payload) {
      text = message.attachment.payload.text;
      if (message.attachment.payload.template_type === "button") {
        const buttons = message.attachment.payload.buttons;
        let i = this.buttons.length;
        buttons.forEach((b) => text = text + `\n\t${i++}. ${b.title}`);
        this.buttons.push(...buttons);
        text = text + "\n\tYou can choose a button with the command '/but <button number>'.";
      }
    }
    console.log(`to: (${id}) < ${text}`);
    this.interface.prompt();
  }

  setPrompt() {
    this.interface.setPrompt(`(${this.currentVolunteer}) > `);
  }

  startListening() {
    console.log(`Welcome to the interactive test mode.
You are currently impersonating volunteer ${this.currentVolunteer}.
You can switch volunteer ids with the command '/vol <id>'.`);
    this.interface.on("line", (line) => {
      const values = line.trim().split(" ");
      const reply = this.sendMessage.bind(this, this.currentVolunteer);
      if (values.length === 2 && values[0] === "/vol") {
        this.currentVolunteer = parseInt(values[1], 10);
        this.setPrompt();
        this.interface.prompt();
      } else if (values.length === 2 && values[0] === "/but") {
        const buttonIndex = parseInt(values[1], 10);
        if (!(buttonIndex in this.buttons)) {
          console.log(`Button ${buttonIndex} not found.`);
          return this.interface.prompt();
        }
        if (this.buttons[buttonIndex].type === "postback") {
          const payload = {
            sender: {
            id: this.currentVolunteer,
            profile: {
              first_name: "John",
              last_name: "Smith"
            }
          },
          postback: {payload: this.buttons[buttonIndex].payload}
        };
          handlers.dispatchPostback(payload, reply);
        } else if (this.buttons[buttonIndex].type === "web_url") {
          open(this.buttons[buttonIndex].url);
          console.log(`\topening url: ${this.buttons[buttonIndex].url}`);
          this.interface.prompt();
        }
      } else {
        const payload = {
          sender: {
            id: this.currentVolunteer,
            profile: {
              first_name: "John",
              last_name: "Smith"
            }
          },
          message: {
            text: line.trim()
          }
        };
        handlers.dispatchMessage(payload, reply);
      }
  }).on("close", () => {
       console.log("Bot shutdown.");
       process.exit(0);
  });
  this.interface.prompt();
   }
}

module.exports.instance = new Interactive();