/**
 *  Simple call box routine
 * 
 *  This function is meant for the apartment building callbox
 *  It gives the user a couple of seconds to produce the password
 * 	Then dials all the residents to grant manual entry
 */
const fetch = require('node-fetch');

exports.handler = async function(context, event, callback) {
  let twiml = new Twilio.twiml.VoiceResponse();

  let config = await fetch(context.DOORMAN_URL + `/api/door/info?buzzer=${event.From}`)
    .then(res => res.json())
    .catch(err => {
      return undefined;
    });

  // reject the call if this is not configured
  if (!config || !config.door) {
    twiml.reject();
    callback(null, twiml);
    return;
  }

  let configQuery = `config=${encodeURIComponent(JSON.stringify(config))}`;

  // let user know someone is currently buzzing, and allow unlock by discord user
  let msg = `🔔 Someone is dialing right now @ Door "${config.door}" [Click to unlock](${context.DOORMAN_URL}/api/door/auth?door=${config.door}&key=`;
  config.discordUsers.forEach((u) => {
    // unlock me by discord userid
    fetch(context.DOORMAN_URL + `/api/door/notify?discordUser=${u}&msg=${encodeURIComponent(msg + u + ')')}`);
  });

  // poll Doorman, to see if we should unlock
  const interval = setInterval(() => {
    fetch(context.DOORMAN_URL + `/api/door/status?door=${config.door}`)
      .then(async res => {
        // handle the case where doorman is explictly rejecting the buzzer
        if (res.status === 410) {
          clearInterval(interval);
          twiml.redirect(`/text-me?method=doorman-time-lock&${configQuery}`);
          callback(null, twiml);
        } 
        
        // we got the successful unlock
        else if (res.status === 200) {
          clearInterval(interval);
          const body = await res.json();
          twiml.redirect(`/door-open?fingerprint=${encodeURIComponent(JSON.stringify(body))}&${configQuery}`);
          callback(null, twiml);
        }
      })
      .catch(err => console.log(err));
  }, 500);

  // redirect to call after 6s
  setTimeout(() => {
    twiml.redirect(`/call-residents?${configQuery}`);
    callback(null, twiml);
  }, 6000);
};