import {afterEach, describe, expect, it, vi} from 'vitest';

import {
  clampVolume,
  DEFAULT_MUSIC_VOLUME,
  normalizePlatformTheme,
  readSavedSettings,
  writeSavedSettings,
} from './gameSettingsStorage';
import type {JsonStorage} from './storage';

function createMemoryStorage(): JsonStorage {
  const values = new Map<string, string>();

  return {
    getItem(key) {
      return values.has(key) ? values.get(key)! : null;
    },
    setItem(key, value) {
      values.set(key, value);
    },
    removeItem(key) {
      values.delete(key);
    },
  };
}

describe('gameSettingsStorage', () => {
  afterEach(() => {
    vi.unstubAllGlobals();
  });

  it('falls back to defaults when nothing has been saved', () => {
    vi.stubGlobal('window', {localStorage: createMemoryStorage()});

    expect(readSavedSettings()).toEqual({
      musicVolume: DEFAULT_MUSIC_VOLUME,
      platformTheme: 'light',
    });
  });

  it('reads legacy unversioned payloads and clamps the volume', () => {
    const storage = createMemoryStorage();
    storage.setItem('tavernrealms.settings.v1', JSON.stringify({musicVolume: 2}));
    vi.stubGlobal('window', {localStorage: storage});

    expect(readSavedSettings()).toEqual({
      musicVolume: 1,
      platformTheme: 'light',
    });
  });

  it('reads stored platform theme when available', () => {
    const storage = createMemoryStorage();
    storage.setItem(
      'tavernrealms.settings.v1',
      JSON.stringify({musicVolume: 0.5, platformTheme: 'dark'}),
    );
    vi.stubGlobal('window', {localStorage: storage});

    expect(readSavedSettings()).toEqual({
      musicVolume: 0.5,
      platformTheme: 'dark',
    });
    expect(normalizePlatformTheme('unknown')).toBe('light');
  });

  it('writes versioned settings payloads', () => {
    const storage = createMemoryStorage();
    vi.stubGlobal('window', {localStorage: storage});

    writeSavedSettings({
      musicVolume: clampVolume(0.6),
      platformTheme: 'dark',
    });

    expect(JSON.parse(storage.getItem('tavernrealms.settings.v1') ?? '{}')).toEqual({
      version: 1,
      musicVolume: 0.6,
      platformTheme: 'dark',
    });
  });
});