import { expect } from "chai";
import { ONLINE_TESTING } from "test/helper/Supports";
import { Ticker } from "./Ticker";

describe("Ticker", () => {

	function empty(): void {
		// do nothing
	}

	it("can be created and disposed", () => {
		const ticker = new Ticker(empty, "offline", 1);
		ticker.dispose();
	});

	it("can adjust the type", () => {
		const ticker = new Ticker(empty, "worker", 0.1);
		expect(ticker.type).to.equal("worker");
		ticker.type = "timeout";
		expect(ticker.type).to.equal("timeout");
		ticker.type = "offline";
		expect(ticker.type).to.equal("offline");
		ticker.dispose();
	});

	it("can get/set the updateInterval", () => {
		const ticker = new Ticker(empty, "worker", 0.1);
		expect(ticker.updateInterval).to.equal(0.1);
		ticker.updateInterval = 0.5;
		expect(ticker.updateInterval).to.equal(0.5);
		ticker.dispose();
	});

	if (ONLINE_TESTING) {

		context("timeout", () => {

			it("provides a callback when set to timeout", done => {
				const ticker = new Ticker(() => {
					ticker.dispose();
					done();
				}, "timeout", 0.01);
			});

			it("can adjust the interval when set to timeout", (done) => {
				const ticker = new Ticker(() => {
					ticker.dispose();
					done();
				}, "timeout", 0.01);
				ticker.updateInterval = 0.1;
			});
		});
	}

	context("worker", () => {

		it("provides a callback when set to worker", done => {
			const ticker = new Ticker(() => {
				ticker.dispose();
				done();
			}, "worker", 0.01);
		});

		it("falls back to timeout if the constructor throws an error", done => {
			const URL = window.URL;
			// @ts-ignore
			window.URL = null;
			const ticker = new Ticker(() => {
				expect(ticker.type).to.equal("timeout");
				ticker.dispose();
				window.URL = URL;
				done();
			}, "worker", 0.01);

		});

		it("can adjust the interval when set to worker", (done) => {
			const ticker = new Ticker(() => {
				ticker.dispose();
				done();
			}, "worker", 0.01);
			ticker.updateInterval = 0.1;
		});

	});
});