// A doorbell: Alexa.DoorbellEventSource. It takes no directive and reports no state of the button;
// device.raise() says that somebody rang. Press Enter to ring.
//
// The event is published to <root>/event. Not tested with an Alexa account yet: whether the press reaches Alexa
// depends on the Alex2MQTT service relaying that topic. Alexa wants 30 seconds between two presses of one doorbell.
//
//   ALEX2MQTT_USERNAME=... ALEX2MQTT_PASSWORD=... ALEX2MQTT_ROOT_TOPIC=... node examples/doorbell.js
//
// "alex2node" is the installed package; inside this checkout it resolves to the built dist/.
const { Alex2MQTT, DoorbellEventSource } = require("alex2node");

const missing = ["ALEX2MQTT_USERNAME", "ALEX2MQTT_PASSWORD", "ALEX2MQTT_ROOT_TOPIC"].filter((name) => !process.env[name]);
if (missing.length > 0) {
  console.error(`${missing.join(", ")} not set. Set the MQTT user name, the password and the root topic of your Alex2MQTT account.`);
  process.exit(1);
}
const { ALEX2MQTT_USERNAME, ALEX2MQTT_PASSWORD, ALEX2MQTT_ROOT_TOPIC } = process.env;

const bridge = new Alex2MQTT(ALEX2MQTT_USERNAME, ALEX2MQTT_PASSWORD, ALEX2MQTT_ROOT_TOPIC);
bridge.on("connect", () => console.log("connected, discover the devices in the Alexa app"));
bridge.on("error", (err) => console.error("bridge:", err.message));

const device = bridge.addDevice({ endpointId: "front-doorbell", name: "Front Doorbell", categories: ["DOORBELL"] });
device.add(DoorbellEventSource);

device.state((s) => s.health("OK"));

let rangAt = 0;
process.stdin.on("data", async () => {
  if (Date.now() - rangAt < 30000) {
    console.log("not sent: the last press is less than 30 seconds ago");
    return;
  }
  rangAt = Date.now();
  // raise() throws for an event the device did not declare, and resolves with what became of the publish
  const result = await device.raise(DoorbellEventSource, "DoorbellPress");
  console.log(result.ok ? "the press was sent" : `not sent: ${result.error.message}`);
});

bridge.connect();