// author: simon-pierre boucher <contact@spboucher.ai>
import { describe, expect, it } from "vitest";
import { normalizeUrl } from "./url.js";

function norm(raw: string, base?: string): string {
  const r = normalizeUrl(raw, base);
  if (!r.ok) throw new Error(`expected ok, got ${r.error.code}`);
  return r.value;
}

describe("normalizeUrl", () => {
  it("lowercases the host but not the path", () => {
    expect(norm("https://EXAMPLE.com/Path")).toBe("https://example.com/Path");
  });

  it("strips default ports", () => {
    expect(norm("http://example.com:80/a")).toBe("http://example.com/a");
    expect(norm("https://example.com:443/a")).toBe("https://example.com/a");
  });

  it("keeps non-default ports", () => {
    expect(norm("https://example.com:8443/a")).toBe("https://example.com:8443/a");
  });

  it("removes tracking params but keeps real ones", () => {
    expect(norm("https://e.com/?utm_source=x&q=1&fbclid=z&_ga=2")).toBe("https://e.com/?q=1");
  });

  it("sorts query params deterministically", () => {
    expect(norm("https://e.com/?b=2&a=1&a=0")).toBe("https://e.com/?a=0&a=1&b=2");
  });

  it("drops the fragment unless hashbang", () => {
    expect(norm("https://e.com/p#section")).toBe("https://e.com/p");
    expect(norm("https://e.com/p#!/route")).toBe("https://e.com/p#!/route");
  });

  it("removes trailing slash except at root", () => {
    expect(norm("https://e.com/foo/")).toBe("https://e.com/foo");
    expect(norm("https://e.com/")).toBe("https://e.com/");
  });

  it("resolves dot segments", () => {
    expect(norm("https://e.com/a/b/../c")).toBe("https://e.com/a/c");
  });

  it("punycodes international hosts", () => {
    expect(norm("https://münchen.de/")).toBe("https://xn--mnchen-3ya.de/");
  });

  it("resolves relative URLs against a base", () => {
    expect(norm("../x", "https://e.com/a/b")).toBe("https://e.com/x");
  });

  it("rejects non-http schemes", () => {
    const r = normalizeUrl("ftp://e.com/x");
    expect(r.ok).toBe(false);
    if (!r.ok) expect(r.error.code).toBe("ERR_INVALID_URL");
  });

  it("rejects malformed input", () => {
    const r = normalizeUrl("not a url");
    expect(r.ok).toBe(false);
  });

  it("produces identical output for equivalent URLs", () => {
    expect(norm("https://E.com:443/a/../b/?utm_x=1&z=9#frag")).toBe(norm("https://e.com/b?z=9"));
  });
});