// 主题选择：深色 / 浅色 / 墨绿直接上屏；跟随系统只在深色与浅色之间解析。
export type ThemeChoice = 'dark' | 'light' | 'molv' | 'system'
export type PaintedTheme = 'dark' | 'light' | 'molv'

export function resolveTheme(choice: string, prefersDark: boolean): PaintedTheme {
  if (choice === 'system') return prefersDark ? 'dark' : 'light'
  if (choice === 'light' || choice === 'molv') return choice
  return 'dark'
}

export function isThemeChoice(value: string): value is ThemeChoice {
  return value === 'dark' || value === 'light' || value === 'molv' || value === 'system'
}