/**
 * Try to unlock the door with auth mode
 */

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

  let door = event.door;
  let pin = event.key;

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

  const ddbPath = Runtime.getFunctions()['common/ddb'].path;
  const ddb = require(ddbPath);
  const client = ddb.createDDBClient(context);

  const config = await client.send(ddb.getDoorConfigCommand(door));

  if (!config.Item) {
    response.setStatusCode(404);
    return callback(null, response);
  }

  let correctPin = config.Item.pin.S;

  if (correctPin !== pin) {
    response.setStatusCode(401);
    return callback(null, response);
  }

  const fingerprint = { 
    method: "PIN",
    userAgent: event.request.headers['user-agent'],
  };
  const timeout = config.Item.timeout.N;

  await client.send(ddb.setLockStatusCommand(door, timeout, fingerprint))
    .then(async (item) => {    
      response
        .setStatusCode(200)
        .appendHeader('Content-Type', 'application/json')
        .setBody({ msg: `Opened the door "${door}" for ${timeout}s` });
    }).catch((e) => {
      console.log(e);
      response
        .setStatusCode(500)
        .appendHeader('Content-Type', 'application/json')
        .setBody({ err: e });
    });
  await client.destroy();
  return callback(null, response);
};