import { ionDarkClass } from '~/constants'

/**
 * 手动切换暗色时，浏览器状态栏颜色跟随应用而不是系统
 */
function syncThemeColor(color: string) {
  document.querySelectorAll<HTMLMetaElement>('meta[name="theme-color"]').forEach(meta => (meta.content = color))
}

export const useDarkMode = createSharedComposable(() => {
  const color = useColorMode()
  const isDark = computed(() => color.value === 'dark')

  function setLightMode() {
    document.documentElement.classList.remove(ionDarkClass)
    syncThemeColor('#f2f2f6')
  }

  function setDarkMode() {
    document.documentElement.classList.add(ionDarkClass)
    syncThemeColor('#000000')
  }

  return {
    color,
    isDark,
    setLightMode,
    setDarkMode,

    toggleDark() {
      const targetMode = color.value === 'dark' ? 'light' : 'dark'
      color.preference = targetMode

      if (targetMode === 'dark') {
        setDarkMode()
      }
      else {
        setLightMode()
      }
    },
  }
})