export const GUANGHU_THEME_STORAGE_KEY = 'guanghu-theme'

export const GUANGHU_THEMES = [
  'native',
  'guanghu-native-galaxy',
  'lake-light',
  'lake-dark',
  'aurora-dark',
  'ice-heart',
  'yaoming-purple',
  'starfield-indigo',
  'dawn-gold',
  'tundra-green',
  'peach-mist',
] as const
export type GuanghuTheme = typeof GUANGHU_THEMES[number]

export const GUANGHU_THEME_LABELS: Record<GuanghuTheme, string> = {
  native: '跟随原生',
  'guanghu-native-galaxy': '光湖原生星系',
  'lake-light': '湖光浅色（亮）',
  'lake-dark': '湖心深色（暗）',
  'aurora-dark': '极光深海',
  'ice-heart': '冰心蓝',
  'yaoming-purple': '曜冥紫',
  'starfield-indigo': '星野靛青',
  'dawn-gold': '晨曦金',
  'tundra-green': '苔原绿',
  'peach-mist': '桃雾晨光',
}

export function normalizeGuanghuTheme(value: unknown): GuanghuTheme {
  return typeof value === 'string' && (GUANGHU_THEMES as readonly string[]).includes(value)
    ? value as GuanghuTheme
    : 'native'
}

export function readGuanghuTheme(storage: Pick<Storage, 'getItem'>): GuanghuTheme {
  try {
    const storedTheme = storage.getItem(GUANGHU_THEME_STORAGE_KEY)
    return storedTheme === null
      ? 'guanghu-native-galaxy'
      : normalizeGuanghuTheme(storedTheme)
  } catch {
    return 'guanghu-native-galaxy'
  }
}

export function writeGuanghuTheme(storage: Pick<Storage, 'setItem'>, theme: GuanghuTheme): void {
  try {
    storage.setItem(GUANGHU_THEME_STORAGE_KEY, theme)
  } catch {
    // Storage may be unavailable in restricted browser contexts.
  }
}