import { describe, expect, it } from "vitest";
import { isFavorite, readFavorites, toggleFavorite } from "./favorites";

describe("favorites localStorage helpers", () => {
  it("returns an empty list for missing, invalid, or non-array values", () => {
    expect(readFavorites()).toEqual([]);

    localStorage.setItem("ark_favorites", "not-json");
    expect(readFavorites()).toEqual([]);

    localStorage.setItem("ark_favorites", JSON.stringify({ id: "r1" }));
    expect(readFavorites()).toEqual([]);
  });

  it("filters non-string entries and toggles favorite ids", () => {
    localStorage.setItem("ark_favorites", JSON.stringify(["r1", 123, "r2"]));
    expect(readFavorites()).toEqual(["r1", "r2"]);

    expect(toggleFavorite("r3")).toBe(true);
    expect(isFavorite("r3")).toBe(true);
    expect(readFavorites()).toEqual(["r1", "r2", "r3"]);

    expect(toggleFavorite("r1")).toBe(false);
    expect(isFavorite("r1")).toBe(false);
    expect(readFavorites()).toEqual(["r2", "r3"]);
  });
});