/**
 * Try to update door status
 */

const redis = require('redis');

function doorStatusKey(id) {
  return concatKeys("doors", id, 'open');
}

function concatKeys(...keys) {
  return keys.join(':');
}

exports.handler = function(context, event, callback) {
  const response = new Twilio.Response();

  let door = event.door;

  if (!door) {
    response.setStatusCode(400);
    return callback(null, response);
  }

  let client = redis.createClient({ url: context.REDIS_CONNECT_URL });
  client.connect()
    .then(async () => {
      const isOpen = await client.get(doorStatusKey(door));

      if (isOpen) {
        const fingerprint = JSON.parse(isOpen);

        response
          .setStatusCode(200)
          .appendHeader('Content-Type', 'application/json')
          .setBody({
            status: "OPEN",
            fingerprint,
          });
        await client.getDel(doorStatusKey(door));
        await client.quit();

        return callback(null, response);
      }

      response
        .setStatusCode(401)
        .appendHeader('Content-Type', 'application/json')
        .setBody({
          status: "CLOSED", 
        });

      return callback(null, response);
    }).catch((e) => {
      console.log(e);
      response
        .setStatusCode(500)
        .appendHeader('Content-Type', 'application/json')
        .setBody({ err: e });
    });;
};