// A lamp that switches and dims: Alexa.PowerController and Alexa.BrightnessController.
//
//   ALEX2MQTT_USERNAME=... ALEX2MQTT_PASSWORD=... ALEX2MQTT_ROOT_TOPIC=... node examples/lamp.js
//
// "alex2node" is the installed package; inside this checkout it resolves to the built dist/.
const { Alex2MQTT, PowerController, BrightnessController } = 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));

// The lamp itself. Replace it with what drives yours.
const lamp = { on: false, brightness: 100 };

const device = bridge.addDevice({ endpointId: "desk-lamp", name: "Desk Lamp", categories: ["LIGHT"] });
const power = device.add(PowerController);
const brightness = device.add(BrightnessController);

// The whole state: the answer to ReportState, and the context of every ctx.respond()
device.state((s) => s
  .set(power, "powerState", lamp.on ? "ON" : "OFF")
  .set(brightness, "brightness", lamp.brightness)
  .health("OK"));

power.on("TurnOn", (ctx) => {
  lamp.on = true;
  return ctx.respond();
});
power.on("TurnOff", (ctx) => {
  lamp.on = false;
  return ctx.respond();
});
// Both brightness directives turn a lamp on that is off
brightness.on("SetBrightness", (ctx) => {
  lamp.brightness = ctx.payload.brightness;
  lamp.on = true;
  return ctx.respond();
});
brightness.on("AdjustBrightness", (ctx) => {
  lamp.brightness = Math.min(100, Math.max(0, lamp.brightness + ctx.payload.brightnessDelta));
  lamp.on = true;
  return ctx.respond();
});

bridge.connect();