app.js

// Import required modules
// require("dotenv").config();
const express = require("express");
const twilio = require("twilio");
const VoiceResponse = twilio.twiml.VoiceResponse;

// Set up Express app and Twilio client
const app = express();
const apiBaseUrl = process.env.API_BASE_URL;
const accountSid = process.env.TWILIO_ACCOUNT_SID;
const authToken = process.env.TWILIO_AUTH_TOKEN;
const fromPhone = process.env.TWILIO_PHONE_NUMBER;
const client = new twilio(accountSid, authToken);

// Configure Express middleware to parse URL-encoded body
app.use(express.urlencoded({ extended: false }));

const voicePool = [
  "Polly.Seoyeon",
  "Google.ko-KR-Standard-A",
  "Google.ko-KR-Standard-B",
  "Google.ko-KR-Standard-C",
  "Google.ko-KR-Standard-D",
];

/**
 * Initiates a phone call to the given phone number.
 * @param {string} toPhone - The phone number to call.
 */
function makeCall(toPhone) {
  client.calls
    .create({
      url: `${apiBaseUrl}/voice?to=${encodeURIComponent(toPhone)}`,
      to: `+82${toPhone}`,
      from: fromPhone,
    })
    .then((call) => console.log(`Call initiated with ID: ${call.sid}`))
    .catch((err) => console.error(err));
}

// Handle the voice call with user input
app.post("/voice", (req, res) => {
  const pressedKey = req.body.Digits;
  const toPhone = req.query.to;
  const response = new VoiceResponse();

  // If no key is pressed, prompt the user for input
  if (!pressedKey) {
    const gather = response.gather({
      input: "dtmf",
      timeout: 10,
      numDigits: 1,
      action: `/voice?to=${encodeURIComponent(toPhone)}`,
    });
    gather.say(
      "산업기능요원 퇴근 기록은 하셨나요? 기록했다면 1번, 찍는 날이 아니라면 2번, 잠시 후 찍겠다면 3번을 눌러주세요.",
      {
        language: "ko-KR",
        voice: voicePool[Math.floor(Math.random() * voicePool.length)],
      }
    );
  } else {
    handleKeyPress(response, pressedKey, toPhone);
  }

  res.type("text/xml");
  res.send(response.toString());
});

/**
 * Handles the user's key press during the phone call.
 * @param {VoiceResponse} response - The TwiML response.
 * @param {string} pressedKey - The key the user pressed.
 * @param {string} toPhone - The phone number that received the call.
 */
function handleKeyPress(response, pressedKey, toPhone) {
  if (!["1", "2", "3"].includes(pressedKey)) {
    response.say("잠시 후에 다시 확인하겠습니다.", {
      language: "ko-KR",
      voice: voicePool[Math.floor(Math.random() * voicePool.length)],
    });
    response.hangup();
    setTimeout(() => makeCall(toPhone), 3 * 60 * 1000);
  } else if (pressedKey === "3") {
    response.say("잠시 후에 다시 확인하겠습니다.", {
      language: "ko-KR",
      voice: voicePool[Math.floor(Math.random() * voicePool.length)],
    });
    response.hangup();
    setTimeout(() => makeCall(toPhone), 5 * 60 * 1000);
  } else {
    response.say("확인되었습니다.", {
      language: "ko-KR",
      voice: voicePool[Math.floor(Math.random() * voicePool.length)],
    });
    response.hangup();
  }
}

// Initiates a phone call when the /call endpoint is requested
app.post("/call", (req, res) => {
  const toPhone = req.query.to;
  if (!toPhone) {
    res.status(400).send('Missing "to" parameter');
    return;
  }

  makeCall(toPhone);
  res.status(200).send("Phone call initiated");
});

app.get("/health", (req, res) => {
  res.status(200).send("OK");
});

// Start the server
app.listen(3008, () => {
  console.log("Server listening on port 3008");
});