// What the events of several interfaces have in common.
import { CAUSES } from "./catalog.js";
import type { Cause } from "./catalog.js";
import { s } from "./schema.js";

/** The time of an event: now, unless the payload says when. */
export const timestamp = s.defaulted(s.dateTime(), () => new Date().toISOString());

/**
 * The payload of an event that happened at a time and for a reason: ActivationStarted, DoorbellPress. Both are
 * required by Alexa. The cause is the usual one of the event unless the payload names another.
 */
export const happened = (usually: Cause) => s.object({
  cause: s.defaulted(s.object({ type: s.enum(...CAUSES) }), () => ({ type: usually })),
  timestamp,
});