import { describe, expect, it } from "vitest";
import { MAX_SAFE_NAME_BYTES, safeFileName } from "./names.js";

describe("safeFileName", () => {
  it("keeps ordinary names", () => {
    expect(safeFileName("Meeting notes.pdf")).toBe("Meeting notes.pdf");
  });

  it("strips directories and traversal", () => {
    expect(safeFileName("../../etc/passwd")).toBe("passwd");
    expect(safeFileName("C:\\Users\\x\\evil.exe")).toBe("evil.exe");
    expect(safeFileName("..")).toBe("attachment");
  });

  it("removes control/bidi characters and reserved punctuation", () => {
    expect(safeFileName("a\u0000b\u202ecod.exe")).toBe("abcod.exe");
    expect(safeFileName('we<ir>d:"na|me?*.txt')).toBe("we_ir_d_na_me_.txt");
    expect(safeFileName("   .hidden  ")).toBe("hidden");
  });

  it("NFKC-normalises and collapses whitespace", () => {
    expect(safeFileName("ｆｕｌｌ  \t width.PNG")).toBe("full width.png");
  });

  it("guards Windows device names", () => {
    expect(safeFileName("CON.txt")).toBe("_CON.txt");
  });

  it("appends the sniffed extension only when none exists", () => {
    expect(safeFileName("photo", "jpg")).toBe("photo.jpg");
    expect(safeFileName("photo.jpeg", "jpg")).toBe("photo.jpeg");
    expect(safeFileName("", "pdf")).toBe("attachment.pdf");
  });

  it("bounds length in UTF-8 bytes while preserving the extension", () => {
    const name = safeFileName(`${"ü".repeat(200)}.pdf`);
    expect(Buffer.byteLength(name, "utf8")).toBeLessThanOrEqual(MAX_SAFE_NAME_BYTES);
    expect(name.endsWith(".pdf")).toBe(true);
  });
});