// @vitest-environment jsdom
//
// A store is read from React through `useValue()`, a name the React Compiler knows as a hook. Its
// old name, `use()`, it did not: the call was compiled as an ordinary one and memoized, so it ran
// on the first render alone. Read straight from a component, Back to top never re-rendered;
// read inside a hook that compiles memo scopes around it, usePlaylistActions rendered fewer hooks
// on its second render and threw (the moment that hook started to compile). Vitest builds
// with the same compiler as the app (reactPlugin), so this renders the compiled code.
import { describe, it, expect, afterEach } from "vitest";
import { render, screen, act, cleanup } from "@testing-library/react";
import { useState } from "react";
import { createStore } from "./store";

afterEach(cleanup);

const count = createStore(0);

// A hook shaped like usePlaylistActions: other hooks around the read, and a callback built from it.
function useCountLabel(prefix: string) {
  const [step] = useState(1);
  const value = count.useValue();
  const next = () => count.set(value + step);
  return { label: `${prefix}${value}`, next };
}

function Counter() {
  const { label, next } = useCountLabel("n=");
  return <button onClick={next}>{label}</button>;
}

function Bare() {
  return <span>{`bare=${count.useValue()}`}</span>;
}

describe("a store read from React", () => {
  it("re-renders a compiled hook and a compiled component on every change", () => {
    act(() => count.set(0));
    render(
      <>
        <Counter />
        <Bare />
      </>,
    );
    act(() => count.set(1));
    expect(screen.getByRole("button").textContent).toBe("n=1");
    expect(screen.getByText("bare=1")).toBeTruthy();
    act(() => screen.getByRole("button").click());
    expect(screen.getByRole("button").textContent).toBe("n=2");
    expect(screen.getByText("bare=2")).toBeTruthy();
  });
});