import hass from 'homeassistant-ws';

async function main() {
  // Assuming hass running in `localhost`, under the default `8321` port:
  const client = await hass({
    token: 'my-secret-token',
  });
}

hass({
  protocol: 'ws',
  host: 'localhost',
  port: 8123,
  path: '/api/websocket',

  // Must be set if HA expects authentication:
  token: null,

  // Used to serialize outgoing messages:
  messageSerializer: (outgoingMessage) => JSON.stringify(outgoingMessage),

  // Used to parse incoming messages. Receives the entire Websocket message object:
  messageParser: (incomingMessage) => JSON.parse(incomingMessage.data),

  // Should return a WebSocket instance
  ws: (opts) => {
    return new WebSocket(
      `${opts.protocol}://${opts.host}:${opts.port}${opts.path}`
    );
  },
});

import hass from 'hass';

async function main() {
  // Establishes a connection, and authenticates if necessary:
  const client = await hass({ token: 'my-token' });

  // Get a list of all available states, panels or services:
  await client.getStates();
  await client.getServices();
  await client.getPanels();

  // Get hass configuration:
  await client.getConfig();

  // Get a Buffer containing the current thumbnail for the given media player
  await client.getMediaPlayerThumbnail('media_player.my_player');
  // { content_type: 'image/jpeg', content: Buffer<...>}

  // Get a Buffer containing a thumbnail for the given camera
  await client.getCameraThumbnail('camera.front_yard');
  // { content_type: 'image/jpeg', content: Buffer<...>}

  // Call a service, by its domain and name. The third argument is optional.
  await client.callService('lights', 'turn_on', {
    entity_id: 'light.my_light',
  });

  // Listen for all HASS events - the 'message' event is a homeassistant-ws event triggered for
  // all messages received through the websocket connection with HASS:
  //
  // See https://developers.home-assistant.io/docs/api/websocket/ for details on HASS events:
  client.on('message', (rawMessageData) => {
    console.log(rawMessageData);
  });

  // Listen only for state changes:
  client.on('state_changed', (stateChangedEvent) => {
    console.log(stateChangedEvent.data.new_state.state);
  });
}