import { beforeEach, describe, expect, it } from "vitest";

import {
  getPreviousToolcraftStorageKey,
  readToolcraftLocalStorageEntry,
} from "./storage-key-migration";

beforeEach(() => {
  window.localStorage.clear();
});

describe("Toolcraft storage key migration", () => {
  it("prefers the current key", () => {
    const key = "toolcraft:example:state:v2";
    const previousKey = getPreviousToolcraftStorageKey(key)!;

    window.localStorage.setItem(key, "current");
    window.localStorage.setItem(previousKey, "previous");

    expect(readToolcraftLocalStorageEntry(key)).toEqual({
      storageKey: key,
      value: "current",
    });
  });

  it("reads a previous identity key without copying or deleting it", () => {
    const key = "toolcraft:example:state:v2";
    const previousKey = getPreviousToolcraftStorageKey(key)!;
    const newerPayload = JSON.stringify({ state: {}, version: 3 });

    window.localStorage.setItem(previousKey, newerPayload);

    expect(readToolcraftLocalStorageEntry(key)).toEqual({
      storageKey: previousKey,
      value: newerPayload,
    });
    expect(window.localStorage.getItem(key)).toBeNull();
    expect(window.localStorage.getItem(previousKey)).toBe(newerPayload);
  });
});