import { batched, EventBus, markup } from "../src/runtime/utils";
import { nextMicroTick } from "./helpers";

describe("event bus behaviour", () => {
  test("can subscribe and be notified", () => {
    const bus = new EventBus();
    let notified = false;
    bus.addEventListener("event", () => {
      notified = true;
    });
    expect(notified).toBe(false);
    bus.trigger("event");
    expect(notified).toBe(true);
  });

  test("can unsubscribe", () => {
    const bus = new EventBus();
    let n = 0;
    let cb = () => n++;
    bus.addEventListener("event", cb);
    expect(n).toBe(0);
    bus.trigger("event");
    expect(n).toBe(1);
    bus.removeEventListener("event", cb);
    expect(n).toBe(1);
    bus.trigger("event");
    expect(n).toBe(1);
  });

  test("arguments are properly propagated", () => {
    expect.assertions(1);
    const bus = new EventBus();
    bus.addEventListener("event", (ev: any) => expect(ev.detail).toBe("hello world"));
    bus.trigger("event", "hello world");
  });
});

describe("batched", () => {
  test("callback is called only once after operations", async () => {
    let n = 0;
    let fn = batched(() => n++);

    expect(n).toBe(0);
    fn();
    fn();
    expect(n).toBe(0);

    await nextMicroTick();
    expect(n).toBe(1);
    await nextMicroTick();
    expect(n).toBe(1);
  });

  test("calling batched function from within the callback is not treated as part of the original batch", async () => {
    let n = 0;
    let fn = batched(() => {
      n++;
      if (n === 1) {
        fn();
      }
    });

    expect(n).toBe(0);
    fn();
    expect(n).toBe(0);
    await nextMicroTick(); // First batch
    expect(n).toBe(1);
    await nextMicroTick(); // Second batch initiated from within the callback
    expect(n).toBe(2);
    await nextMicroTick();
    expect(n).toBe(2);
  });
});

const Markup = markup("").constructor;
describe("markup", () => {
  test("string is flagged as safe", () => {
    const html = markup("<blink>Hello</blink>");
    expect(html).toBeInstanceOf(Markup);
  });
  describe("tag function", () => {
    test("interpolated values are escaped", () => {
      const maliciousInput = "<script>alert('💥💥')</script>";
      const html = markup`<b>${maliciousInput}</b>`;
      expect(html.toString()).toBe("<b>&lt;script&gt;alert(&#x27;💥💥&#x27;)&lt;/script&gt;</b>");
      expect(html).toBeInstanceOf(Markup);
    });
    test("interpolated markups aren't escaped", () => {
      const shouldBeEscaped = "<script>alert('should be escaped')</script>";
      const shouldnt = markup("<b>this is safe</b>");
      const html = markup`<div>${shouldBeEscaped} ${shouldnt}</div>`;
      expect(html.toString()).toBe(
        "<div>&lt;script&gt;alert(&#x27;should be escaped&#x27;)&lt;/script&gt; <b>this is safe</b></div>"
      );
      expect(html).toBeInstanceOf(Markup);
    });
    test("quotes in interpolated values are escaped", () => {
      const imgUrl = `lol" onerror="alert('xss')`;
      const html = markup`<img src="${imgUrl}">`;
      expect(html.toString()).toBe(`<img src="lol&quot; onerror=&quot;alert(&#x27;xss&#x27;)">`);
    });
  });
});