// A fan that says no: the error types of Alexa as answers. A handler throws an AlexaError of AlexaErrors, or
// answers with ctx.error(). Anything else a handler throws is answered with INTERNAL_ERROR, and a directive without
// a handler with INVALID_DIRECTIVE.
//
//   ALEX2MQTT_USERNAME=... ALEX2MQTT_PASSWORD=... ALEX2MQTT_ROOT_TOPIC=... node examples/errors.js
//
// "alex2node" is the installed package; inside this checkout it resolves to the built dist/.
const { Alex2MQTT, AlexaErrors, PowerController, RangeController, text } = 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 SPEEDS = { min: 1, max: 3 };
const fan = { on: false, speed: 1 };

const device = bridge.addDevice({ endpointId: "attic-fan", name: "Attic Fan", categories: ["FAN"] });
const power = device.add(PowerController);
const speed = device.add(RangeController, {
  instance: "Fan.Speed",
  friendlyNames: [text("Speed", "en-US")],
  range: { min: SPEEDS.min, max: SPEEDS.max, precision: 1 },
});

device.state((s) => s
  .set(power, "powerState", fan.on ? "ON" : "OFF")
  .set(speed, "rangeValue", fan.speed)
  .health("OK"));

power.on("TurnOn", (ctx) => {
  fan.on = true;
  return ctx.respond();
});
power.on("TurnOff", (ctx) => {
  fan.on = false;
  return ctx.respond();
});
speed.on("SetRangeValue", (ctx) => {
  const { rangeValue } = ctx.payload;
  // Without a throw: the type and the message
  if (!fan.on) return ctx.error("NOT_IN_OPERATION", "The fan is off");
  // With a throw: every type has a helper, and the helper of a type with fields of its own takes them
  if (!Number.isInteger(rangeValue) || rangeValue < SPEEDS.min || rangeValue > SPEEDS.max) {
    throw AlexaErrors.valueOutOfRange(
      `The fan has the speeds ${SPEEDS.min} to ${SPEEDS.max}`,
      { minimumValue: SPEEDS.min, maximumValue: SPEEDS.max }
    );
  }
  fan.speed = rangeValue;
  return ctx.respond();
});
// AdjustRangeValue has no handler: the bridge answers it with INVALID_DIRECTIVE

bridge.connect();