import { describe, expect, it } from "vitest";
import { browserPreviewActivity } from "./browser-preview-context";

describe("browserPreviewActivity", () => {
  it("publishes cursors to subscribers and drops cleared ids", () => {
    for (const id of browserPreviewActivity.snapshot().keys()) browserPreviewActivity.clear(id);

    const seen: string[][] = [];
    const unsubscribe = browserPreviewActivity.subscribe((activities) => {
      seen.push([...activities.keys()]);
    });

    try {
      browserPreviewActivity.set("bot-a", 50, 40, "Ada");
      browserPreviewActivity.set("bot-a", 50, 40, "Ada");
      browserPreviewActivity.set("bot-b", 10, 20, "Bob");
      expect(browserPreviewActivity.snapshot().get("bot-a")).toEqual({
        x: 50,
        y: 40,
        label: "Ada",
      });

      browserPreviewActivity.clear("bot-a");
      browserPreviewActivity.clear("missing");

      expect(seen).toEqual([[], ["bot-a"], ["bot-a", "bot-b"], ["bot-b"]]);
    } finally {
      unsubscribe();
      for (const id of [...browserPreviewActivity.snapshot().keys()]) {
        browserPreviewActivity.clear(id);
      }
    }

    expect(browserPreviewActivity.snapshot().size).toBe(0);
  });
});