<template>
  <el-switch
    v-if="'technology' != theme.themeName && 'plain' != theme.themeName && route.path !== '/goods/posterDesign'"
    v-model="mode"
    :active-icon="Moon"
    active-value="dark"
    class="vab-dark"
    :inactive-icon="Sunny"
    inactive-value="light"
    inline-prompt
    @click="_toggleDark($event)"
  />
</template>

<script setup>
// 

import { Moon, Sunny } from '@element-plus/icons-vue'
import { useSettingsStore } from '/@/store/modules/settings'

defineOptions({
  name: 'VabDark',
})

const route = useRoute()
const settingsStore = useSettingsStore()
const { theme, mode } = storeToRefs(settingsStore)
const { updateMode } = settingsStore

const _toggleDark = async (event) => {
  if (typeof document.startViewTransition === 'function') {
    const x = event.clientX
    const y = event.clientY
    const endRadius = Math.hypot(Math.max(x, innerWidth - x), Math.max(y, innerHeight - y))
    let isDark
    const transition = document.startViewTransition(() => {
      const root = document.documentElement
      isDark = root.classList.contains('dark')
      root.classList.remove(isDark ? 'dark' : 'light')
      root.classList.add(isDark ? 'light' : 'dark')
      handleSetScheme(isDark ? 'light' : 'dark')
    })
    await transition.ready.then(() => {
      const clipPath = [`circle(0px at ${x}px ${y}px)`, `circle(${endRadius}px at ${x}px ${y}px)`]
      document.documentElement.animate(
        {
          clipPath: isDark ? [...clipPath].reverse() : clipPath,
        },
        {
          duration: 500,
          easing: 'ease-in',
          pseudoElement: isDark ? '::view-transition-old(root)' : '::view-transition-new(root)',
        }
      )
    })
  } else {
    const toggleDark = useToggle(handleUseDark())
    await toggleDark()
  }
  await updateMode(localStorage.getItem('vueuse-color-scheme'))
}

const handleUseDark = () => {
  return useDark()
}

const handleGetScheme = () => {
  return localStorage.getItem('vueuse-color-scheme')
}

const handleSetScheme = (value) => {
  return localStorage.setItem('vueuse-color-scheme', value)
}

onBeforeMount(() => {
  // 还原默认
  $sub('shop-vite-reset-dark', () => {
    mode.value = handleGetScheme()
    if (handleGetScheme() === 'dark') {
      handleSetScheme('light')
      handleUseDark()
      mode.value = 'light'
    }
  })

  handleUseDark()
  if (handleGetScheme() === 'auto') handleSetScheme('light')
  mode.value = handleGetScheme()
})
</script>

<style lang="scss">
::view-transition-old(root),
::view-transition-new(root) {
  mix-blend-mode: normal;
  animation: none;
}

::view-transition-old(root) {
  z-index: 999;
}

::view-transition-new(root) {
  z-index: 1;
}

.dark {
  &::view-transition-old(root) {
    z-index: 1;
  }

  &::view-transition-new(root) {
    z-index: 999;
  }
}

.vab-dark {
  margin-left: var(--el-margin);
}
</style>
