import { expect, test } from "bun:test";
import { handlePreviewClipboard } from "../src/preview-clipboard.ts";

test("clipboard broker accepts only current preview frames and bounded user-initiated text", async () => {
  const results: unknown[] = [];
  const source = { postMessage: (value: unknown) => results.push(value) } as unknown as Window;
  const frames = [{ contentWindow: source, src: "https://example.test/preview/current" }];
  const event = {
    source,
    data: {
      type: "wrn-studio-copy",
      id: "copy-1",
      path: "/preview/current",
      text: "npm install @wrnexus/ui",
    },
  };
  const copied: string[] = [];
  const write = async (text: string) => {
    copied.push(text);
  };
  expect(await handlePreviewClipboard(event, frames, write)).toBe(true);
  expect(copied).toEqual(["npm install @wrnexus/ui"]);
  expect(results).toEqual([{ type: "wrn-studio-copy-result", id: "copy-1", ok: true }]);
  expect(await handlePreviewClipboard({ ...event, source: null }, frames, write)).toBe(false);
  expect(
    await handlePreviewClipboard(
      { ...event, data: { ...event.data, path: "/preview/old" } },
      frames,
      write,
    ),
  ).toBe(false);
  expect(
    await handlePreviewClipboard(
      { ...event, data: { ...event.data, text: "x".repeat(16385) } },
      frames,
      write,
    ),
  ).toBe(false);
  expect(await handlePreviewClipboard(event, frames, write, false)).toBe(true);
  expect(copied).toHaveLength(1);
  expect(results.at(-1)).toEqual({ type: "wrn-studio-copy-result", id: "copy-1", ok: false });
});

test("clipboard denial reports failure rather than claiming a copy succeeded", async () => {
  let result: any;
  const source = {
    postMessage: (value: unknown) => {
      result = value;
    },
  } as unknown as Window;
  await handlePreviewClipboard(
    {
      source,
      data: { type: "wrn-studio-copy", id: "copy-2", path: "/preview/current", text: "test" },
    },
    [{ contentWindow: source, src: "https://example.test/preview/current" }],
    async () => {
      throw Error("denied");
    },
  );
  expect(result.ok).toBe(false);
});