/**
 * cutover-readiness-poll unit tests (node:test).
 *
 * Run from apps/web:
 *   node --experimental-strip-types --test src/lib/cutover-readiness-poll.test.ts
 */
import assert from "node:assert/strict";
import { describe, it } from "node:test";

import {
	CUTOVER_READINESS_POLL_MS,
	shouldRunCutoverReadinessFetch
} from "./cutover-readiness-poll.ts";

describe("cutover-readiness-poll", () => {
	it("exports a 60s poll interval", () => {
		assert.equal(CUTOVER_READINESS_POLL_MS, 60_000);
	});

	it("allows the first attempt when visible and idle", () => {
		assert.equal(
			shouldRunCutoverReadinessFetch({
				nowMs: 1_000,
				lastAttemptAtMs: 0,
				minIntervalMs: CUTOVER_READINESS_POLL_MS,
				documentVisible: true,
				inFlight: false
			}),
			true
		);
	});

	it("blocks while a request is in flight", () => {
		assert.equal(
			shouldRunCutoverReadinessFetch({
				nowMs: 1_000,
				lastAttemptAtMs: 0,
				minIntervalMs: CUTOVER_READINESS_POLL_MS,
				documentVisible: true,
				inFlight: true
			}),
			false
		);
	});

	it("blocks when the document is hidden", () => {
		assert.equal(
			shouldRunCutoverReadinessFetch({
				nowMs: 1_000,
				lastAttemptAtMs: 0,
				minIntervalMs: CUTOVER_READINESS_POLL_MS,
				documentVisible: false,
				inFlight: false
			}),
			false
		);
	});

	it("throttles repeats inside the min interval", () => {
		assert.equal(
			shouldRunCutoverReadinessFetch({
				nowMs: 30_000,
				lastAttemptAtMs: 1_000,
				minIntervalMs: CUTOVER_READINESS_POLL_MS,
				documentVisible: true,
				inFlight: false
			}),
			false
		);
	});

	it("allows a repeat after the min interval", () => {
		assert.equal(
			shouldRunCutoverReadinessFetch({
				nowMs: 61_000,
				lastAttemptAtMs: 1_000,
				minIntervalMs: CUTOVER_READINESS_POLL_MS,
				documentVisible: true,
				inFlight: false
			}),
			true
		);
	});

	it("force bypasses the min interval but not hidden/in-flight", () => {
		assert.equal(
			shouldRunCutoverReadinessFetch({
				nowMs: 2_000,
				lastAttemptAtMs: 1_000,
				minIntervalMs: CUTOVER_READINESS_POLL_MS,
				documentVisible: true,
				inFlight: false,
				force: true
			}),
			true
		);
		assert.equal(
			shouldRunCutoverReadinessFetch({
				nowMs: 2_000,
				lastAttemptAtMs: 1_000,
				minIntervalMs: CUTOVER_READINESS_POLL_MS,
				documentVisible: false,
				inFlight: false,
				force: true
			}),
			false
		);
		assert.equal(
			shouldRunCutoverReadinessFetch({
				nowMs: 2_000,
				lastAttemptAtMs: 1_000,
				minIntervalMs: CUTOVER_READINESS_POLL_MS,
				documentVisible: true,
				inFlight: true,
				force: true
			}),
			false
		);
	});
});