const engines = require('../engines');

let systemConnection;
let storedConnection;

async function handleFullRefresh() {
  const driver = engines(storedConnection);
  const structure = await driver.analyseFull(systemConnection);
  console.log('SENDING STRUCTURE', structure);
  process.send({ msgtype: 'structure', structure });
}

async function handleConnect(connection, database) {
  storedConnection = connection;

  const driver = engines(storedConnection);
  systemConnection = await driver.connect({ ...storedConnection, database });
  handleFullRefresh();
  setInterval(handleFullRefresh, 30 * 1000);
}

const messageHandlers = {
  connect: handleConnect,
};

async function handleMessage({ msgtype, database, ...other }) {
  const handler = messageHandlers[msgtype];
  await handler(other, database);
}

process.on('message', async message => {
  try {
    await handleMessage(message);
  } catch (e) {
    process.send({ msgtype: 'error', error: e.message });
  }
});