import { expect, test } from "bun:test";
import { readFileSync } from "node:fs";

const source = new Bun.Transpiler({ loader: "ts" }).transformSync(readFileSync(new URL("../src/download.ts", import.meta.url), "utf8")).replace("export function", "function");

test("download keeps direct link after blocked automatic click and releases replaced/detached blobs", () => {
  const revoked: string[] = [], observers: Array<{ callback(): void; disconnect(): void }> = [];
  let sequence = 0, clicks = 0, disconnected = 0;
  const links: any[] = [];
  const outlet = { replaceChildren: (link: unknown) => { links.splice(0, links.length, link); } };
  const host = { isConnected: true, querySelector: () => outlet, ownerDocument: { documentElement: {}, createElement: () => ({ href: "", download: "", textContent: "", click() { clicks++; throw new Error("blocked"); }, remove() { const index = links.indexOf(this); if (index >= 0) links.splice(index, 1); } }) } };
  const offer = new Function("URL", "Blob", "MutationObserver", source + ";return offerBuilderDownload;")(
    { createObjectURL: () => `blob:${++sequence}`, revokeObjectURL: (url: string) => revoked.push(url) }, Blob,
    class { constructor(public callback: () => void) { observers.push(this); } observe() {} disconnect() { disconnected++; } },
  );
  offer(host, "html", "text/html", "draft.html");
  expect(links[0].href).toBe("blob:1"); expect(links[0].download).toBe("draft.html");
  expect(revoked).toEqual([]); expect(clicks).toBe(1);
  offer(host, "text", "text/plain", "draft.txt");
  expect(revoked).toEqual(["blob:1"]); expect(links[0].download).toBe("draft.txt");
  host.isConnected = false; observers[1]!.callback(); observers[1]!.callback();
  expect(revoked).toEqual(["blob:1", "blob:2"]); expect(links).toEqual([]); expect(disconnected).toBe(2);
});