/** The sizes the dividers were dragged to, kept in the browser: what is written, read back and refused. */
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import { keepPanelSize, panelSize, resetPanelSizes } from '../../src/editor/panelSizes';

const STORAGE_KEY = 'feuerwerk.panel-sizes';

function memoryStore(initial: Record<string, string> = {}) {
  const items = new Map(Object.entries(initial));
  return {
    items,
    getItem: (key: string) => items.get(key) ?? null,
    setItem: (key: string, value: string) => void items.set(key, value),
  };
}

describe('the memory of panel sizes', () => {
  beforeEach(() => resetPanelSizes());
  afterEach(() => {
    vi.unstubAllGlobals();
    resetPanelSizes();
  });

  it('starts a panel at its own size where nothing was kept', () => {
    vi.stubGlobal('window', { localStorage: memoryStore() });
    expect(panelSize('left', 250, 160, 500)).toBe(250);
  });

  it('writes a size to the browser and reads it back on a new page', () => {
    const store = memoryStore();
    vi.stubGlobal('window', { localStorage: store });
    keepPanelSize('left', 320);
    expect(panelSize('left', 250, 160, 500)).toBe(320);
    resetPanelSizes();
    expect(panelSize('left', 250, 160, 500)).toBe(320);
    expect(JSON.parse(store.items.get(STORAGE_KEY) ?? '')).toEqual({ left: 320 });
  });

  it('keeps every panel under its own name', () => {
    const store = memoryStore();
    vi.stubGlobal('window', { localStorage: store });
    keepPanelSize('right', 410);
    keepPanelSize('console', 120);
    keepPanelSize('right', 430);
    resetPanelSizes();
    expect(panelSize('right', 350, 200, 600)).toBe(430);
    expect(panelSize('console', 300, 28, 600)).toBe(120);
    expect(panelSize('left', 250, 160, 500)).toBe(250);
    expect(JSON.parse(store.items.get(STORAGE_KEY) ?? '')).toEqual({ console: 120, right: 430 });
  });

  it('holds a kept size to the bounds the divider keeps today', () => {
    vi.stubGlobal('window', {
      localStorage: memoryStore({ [STORAGE_KEY]: JSON.stringify({ left: 9000, right: 3, share: 0.5 }) }),
    });
    expect(panelSize('left', 250, 160, 500)).toBe(500);
    expect(panelSize('right', 350, 200, 600)).toBe(200);
    expect(panelSize('share', 0.6, 0.15, 0.85)).toBe(0.5);
  });

  it('reads rubbish as nothing', () => {
    for (const rubbish of ['{broken', '[300]', '"wide"', 'null', '{"left":"300","right":null}']) {
      resetPanelSizes();
      vi.stubGlobal('window', { localStorage: memoryStore({ [STORAGE_KEY]: rubbish }) });
      expect(panelSize('left', 250, 160, 500), rubbish).toBe(250);
      expect(panelSize('right', 350, 200, 600), rubbish).toBe(350);
    }
  });

  it('remembers for the page where the browser gives no storage', () => {
    keepPanelSize('left', 300);
    expect(panelSize('left', 250, 160, 500)).toBe(300);
    resetPanelSizes();
    expect(panelSize('left', 250, 160, 500)).toBe(250);
  });

  it('remembers for the page where the browser refuses to write', () => {
    vi.stubGlobal('window', {
      localStorage: {
        getItem: () => null,
        setItem: () => {
          throw new Error('quota');
        },
      },
    });
    expect(() => keepPanelSize('left', 300)).not.toThrow();
    expect(panelSize('left', 250, 160, 500)).toBe(300);
  });
});