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

describe("buildHeaders", () => {
  it("emits headers in Safari order", () => {
    const keys = Object.keys(buildHeaders("example.com"));
    expect(keys).toEqual([
      "Host",
      "Accept",
      "Accept-Language",
      "Accept-Encoding",
      "User-Agent",
      "Connection",
      "Sec-Fetch-Dest",
      "Sec-Fetch-Mode",
      "Sec-Fetch-Site",
      "Sec-Fetch-User",
      "Upgrade-Insecure-Requests",
    ]);
  });

  it("always appends the bot suffix to the UA (§26)", () => {
    expect(buildHeaders("example.com")["User-Agent"]).toContain(BOT_SUFFIX);
    expect(buildHeaders("example.com", {}, "Custom/9")["User-Agent"]).toBe("Custom/9" + BOT_SUFFIX);
  });

  it("sets the Host header from the argument", () => {
    expect(buildHeaders("shop.example")["Host"]).toBe("shop.example");
  });

  it("merges overrides over defaults without reordering base keys", () => {
    const h = buildHeaders("example.com", { "Accept-Language": "fr-CA,fr;q=0.9", "X-Extra": "1" });
    expect(h["Accept-Language"]).toBe("fr-CA,fr;q=0.9");
    expect(h["X-Extra"]).toBe("1");
  });
});