import { describe, it, expect } from "vitest";
import { cleanUtm, parseUtmCookie, pickUtm } from "../utm-cookie";

describe("utm-cookie", () => {
  it("разбирает сырую строку запроса из cookie", () => {
    expect(parseUtmCookie("utm_source=youtube&utm_medium=video&utm_campaign=test-20261103&fbclid=x")).toEqual({
      utmSource: "youtube",
      utmMedium: "video",
      utmCampaign: "test-20261103",
    });
  });

  it("понимает percent-кодирование", () => {
    expect(parseUtmCookie("utm_campaign=a%2Db_c.d").utmCampaign).toBe("a-b_c.d");
  });

  it("пустая и битая cookie — пустые метки", () => {
    expect(parseUtmCookie(undefined)).toEqual({ utmSource: "", utmMedium: "", utmCampaign: "" });
    expect(parseUtmCookie("")).toEqual({ utmSource: "", utmMedium: "", utmCampaign: "" });
    expect(parseUtmCookie("%%%")).toEqual({ utmSource: "", utmMedium: "", utmCampaign: "" });
  });

  it("отбрасывает значения не из белого списка символов и слишком длинные", () => {
    expect(cleanUtm("ok-1")).toBe("ok-1");
    expect(cleanUtm("<script>")).toBe("");
    expect(cleanUtm("с пробелом")).toBe("");
    expect(cleanUtm("a".repeat(150))).toBe("a".repeat(100));
    expect(parseUtmCookie("utm_source=x;Domain=evil").utmSource).toBe("");
  });

  it("метки из адреса важнее cookie, поля не смешиваются", () => {
    const cookie = { utmSource: "vk", utmMedium: "video", utmCampaign: "old" };
    expect(pickUtm({ utmSource: "", utmMedium: "", utmCampaign: "new" }, cookie)).toEqual({
      utmSource: "",
      utmMedium: "",
      utmCampaign: "new",
    });
    expect(pickUtm({ utmSource: "", utmMedium: "", utmCampaign: "" }, cookie)).toEqual(cookie);
  });
});