// @vitest-environment jsdom
//
// readSelectedId: the Playlists selected-id seed. Backfills the E4 deep-review's deferred ?pl guard
// coverage — a ?pl bookmark wins over the stored selection but only when it's a positive integer;
// anything else (empty / zero / negative / fractional / non-numeric) falls back to the stored id.
import { describe, it, expect, beforeEach, vi } from "vitest";

const { stored } = vi.hoisted(() => ({ stored: { v: null as string | null } }));
vi.mock("../lib/storage", async (importOriginal) => {
  const actual = await importOriginal<typeof import("../lib/storage")>();
  return { ...actual, getAccountRaw: () => stored.v };
});

import { readSelectedId } from "./playlistsInit";

const setUrl = (search: string) => window.history.replaceState(null, "", search || "/");

beforeEach(() => {
  setUrl("/");
  stored.v = null;
});

describe("readSelectedId ?pl guard", () => {
  it("accepts a positive-integer ?pl", () => {
    setUrl("?pl=5");
    expect(readSelectedId()).toBe(5);
  });

  it("a ?pl bookmark wins over the stored selection", () => {
    setUrl("?pl=5");
    stored.v = "7";
    expect(readSelectedId()).toBe(5);
  });

  it.each(["", "0", "-2", "1.5", "abc"])("rejects ?pl=%s and falls back to stored", (raw) => {
    setUrl(`?pl=${raw}`);
    stored.v = "7";
    expect(readSelectedId()).toBe(7);
  });

  it("rejects a bad ?pl and returns null when there is no stored selection", () => {
    setUrl("?pl=0");
    expect(readSelectedId()).toBeNull();
  });

  it("uses the stored selection when there is no ?pl", () => {
    stored.v = "9";
    expect(readSelectedId()).toBe(9);
  });

  it.each(["", "0", "-2", "1.5", "abc"])(
    "rejects a non-positive-integer STORED value %s (guarded like the URL)",
    (raw) => {
      stored.v = raw;
      expect(readSelectedId()).toBeNull();
    },
  );

  it("returns null when neither ?pl nor a stored selection is present", () => {
    expect(readSelectedId()).toBeNull();
  });
});