/**
 * @file splitViewStorage.test.ts
 * @description Tests for the splitViewStorage module.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

import { describe, it, expect, beforeEach } from "vitest";
import {
  readSplitViewState,
  writeSplitViewState,
  defaultSplitViewState,
} from "../splitViewStorage";

describe("splitViewStorage", () => {
  beforeEach(() => {
    localStorage.clear();
  });

  it("returns the default state when nothing is stored", () => {
    expect(readSplitViewState()).toEqual(defaultSplitViewState());
  });

  it("defaults to a single unselected pane", () => {
    expect(defaultSplitViewState()).toEqual({ layout: 1, paneLaneIds: [null] });
  });

  it("round-trips a written state", () => {
    writeSplitViewState({ layout: 4, paneLaneIds: [1, 2, null, null] });
    expect(readSplitViewState()).toEqual({ layout: 4, paneLaneIds: [1, 2, null, null] });
  });

  it("falls back to the default when stored JSON is malformed", () => {
    localStorage.setItem("ccam.workspace.splitView", "{not json");
    expect(readSplitViewState()).toEqual(defaultSplitViewState());
  });

  it("falls back to the default when the stored layout is not 1, 2, or 4", () => {
    localStorage.setItem(
      "ccam.workspace.splitView",
      JSON.stringify({ layout: 3, paneLaneIds: [] })
    );
    expect(readSplitViewState()).toEqual(defaultSplitViewState());
  });
});