/**
 * @file clipboard.test.ts
 * @description `writeClipboard` / `copyText`: the async Clipboard API when the
 * origin has one, else the hidden-textarea `execCommand("copy")` — the only
 * path on `http://<lan-ip>`, where a terminal selection must still reach the
 * user's clipboard — and the focus goes back to where it was.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */
import { afterEach, describe, expect, it, vi } from "vitest";
import { copyText, writeClipboard } from "../clipboard";

const original = Object.getOwnPropertyDescriptor(navigator, "clipboard");
const setClipboard = (value: unknown) =>
  Object.defineProperty(navigator, "clipboard", { value, configurable: true });

afterEach(() => {
  if (original) Object.defineProperty(navigator, "clipboard", original);
  else delete (navigator as { clipboard?: unknown }).clipboard;
  vi.restoreAllMocks();
});

describe("writeClipboard", () => {
  it("uses the Clipboard API when the origin has one", async () => {
    const writeText = vi.fn().mockResolvedValue(undefined);
    setClipboard({ writeText });
    expect(await writeClipboard("hello")).toBe(true);
    expect(writeText).toHaveBeenCalledWith("hello");
  });

  it("falls back to execCommand on a non-secure origin, and gives the focus back", async () => {
    setClipboard(undefined);
    const input = document.createElement("input");
    document.body.appendChild(input);
    input.focus();
    let copied = "";
    const exec = vi.fn((cmd: string) => {
      copied = document.querySelector("textarea")?.value ?? "";
      return cmd === "copy";
    });
    Object.defineProperty(document, "execCommand", { value: exec, configurable: true });
    expect(await writeClipboard("from tmux")).toBe(true);
    expect(exec).toHaveBeenCalledWith("copy");
    expect(copied).toBe("from tmux");
    expect(document.activeElement).toBe(input);
    expect(document.querySelector("textarea")).toBeNull();
    input.remove();
  });

  it("copyText reports a failed copy", async () => {
    setClipboard(undefined);
    Object.defineProperty(document, "execCommand", {
      value: vi.fn(() => false),
      configurable: true,
    });
    expect(await copyText("x", true)).toBe(false);
  });
});