// @vitest-environment jsdom
//
// useAccountRehydrate re-reads per-account state when the tab's account is pinned after mount (first
// load). useActiveAccountId is mocked with a plain variable so the transition can be driven by hand.
import { describe, it, expect, beforeEach, vi } from "vitest";
import { renderHook, act } from "@testing-library/react";

let account: number | null = null;
vi.mock("./activeAccount", () => ({
  useActiveAccountId: () => account,
}));

import { useAccountRehydrate } from "./useAccountRehydrate";

describe("useAccountRehydrate", () => {
  beforeEach(() => {
    account = null;
  });

  it("runs rehydrate when the account transitions from null to a value", () => {
    const rehydrate = vi.fn();
    const { rerender } = renderHook(() => useAccountRehydrate(rehydrate));
    expect(rehydrate).not.toHaveBeenCalled(); // mount with no account: no transition
    account = 1;
    act(() => rerender());
    expect(rehydrate).toHaveBeenCalledTimes(1);
  });

  it("does not run when the account id is already known and stable", () => {
    account = 1;
    const rehydrate = vi.fn();
    const { rerender } = renderHook(() => useAccountRehydrate(rehydrate));
    act(() => rerender());
    expect(rehydrate).not.toHaveBeenCalled();
  });

  it("skips rehydrate when marked dirty before the account pins (no clobber of a user edit)", () => {
    const rehydrate = vi.fn();
    const { result, rerender } = renderHook(() => useAccountRehydrate(rehydrate));
    act(() => result.current()); // markDirty — the owning setter ran pre-pin
    account = 1;
    act(() => rerender());
    expect(rehydrate).not.toHaveBeenCalled();
  });
});