import { describe, expect, test } from "bun:test";

import { normalizeDomain } from "../tools/network/domain-normalize.js";

describe("normalizeDomain", () => {
  // ── Basic hostname parsing ──────────────────────────────────────────

  test("parses simple hostname", () => {
    const result = normalizeDomain("example.com");
    expect(result).not.toBeNull();
    expect(result!.hostname).toBe("example.com");
    expect(result!.registrableDomain).toBe("example.com");
  });

  test("parses subdomain", () => {
    const result = normalizeDomain("login.example.com");
    expect(result).not.toBeNull();
    expect(result!.hostname).toBe("login.example.com");
    expect(result!.registrableDomain).toBe("example.com");
  });

  test("parses deep subdomain", () => {
    const result = normalizeDomain("foo.bar.example.co.uk");
    expect(result).not.toBeNull();
    expect(result!.hostname).toBe("foo.bar.example.co.uk");
    expect(result!.registrableDomain).toBe("example.co.uk");
  });

  // ── URL extraction ──────────────────────────────────────────────────

  test("extracts hostname from full URL", () => {
    const result = normalizeDomain("https://login.example.com/path?q=1");
    expect(result).not.toBeNull();
    expect(result!.hostname).toBe("login.example.com");
    expect(result!.registrableDomain).toBe("example.com");
  });

  test("extracts hostname from URL with port", () => {
    const result = normalizeDomain("https://example.com:8443/api");
    expect(result).not.toBeNull();
    expect(result!.hostname).toBe("example.com");
  });

  test("strips port from bare hostname", () => {
    const result = normalizeDomain("example.com:8080");
    expect(result).not.toBeNull();
    expect(result!.hostname).toBe("example.com");
    expect(result!.registrableDomain).toBe("example.com");
  });

  // ── Normalization ───────────────────────────────────────────────────

  test("lowercases hostname", () => {
    const result = normalizeDomain("Login.EXAMPLE.Com");
    expect(result).not.toBeNull();
    expect(result!.hostname).toBe("login.example.com");
    expect(result!.registrableDomain).toBe("example.com");
  });

  test("strips trailing dot", () => {
    const result = normalizeDomain("example.com.");
    expect(result).not.toBeNull();
    expect(result!.hostname).toBe("example.com");
    expect(result!.registrableDomain).toBe("example.com");
  });

  // ── Punycode / IDN ──────────────────────────────────────────────────

  test("handles punycode domain", () => {
    const result = normalizeDomain("xn--nxasmq6b.example.com");
    expect(result).not.toBeNull();
    expect(result!.hostname).toBe("xn--nxasmq6b.example.com");
    expect(result!.registrableDomain).toBe("example.com");
  });

  // ── Rejection cases ─────────────────────────────────────────────────

  test("returns null for IPv4 address", () => {
    expect(normalizeDomain("192.168.1.1")).toBeNull();
  });

  test("returns null for IPv6 address", () => {
    expect(normalizeDomain("[::1]")).toBeNull();
    expect(normalizeDomain("::1")).toBeNull();
  });

  test("returns null for localhost", () => {
    expect(normalizeDomain("localhost")).toBeNull();
  });

  test("returns null for empty string", () => {
    expect(normalizeDomain("")).toBeNull();
  });

  test("returns null for null-like input", () => {
    expect(normalizeDomain(null as unknown as string)).toBeNull();
    expect(normalizeDomain(undefined as unknown as string)).toBeNull();
  });

  // ── Co.uk / multi-part TLD ──────────────────────────────────────────

  test("handles co.uk correctly", () => {
    const result = normalizeDomain("www.bbc.co.uk");
    expect(result).not.toBeNull();
    expect(result!.registrableDomain).toBe("bbc.co.uk");
  });

  test("handles com.au correctly", () => {
    const result = normalizeDomain("shop.example.com.au");
    expect(result).not.toBeNull();
    expect(result!.registrableDomain).toBe("example.com.au");
  });
});