<template>
  <div v-if="!item.hidden">
    <template v-if="hasOneShowingChild(item.children, item) && (!onlyOneChild.children || onlyOneChild.noShowingChildren) && !item.alwaysShow">
      <app-link v-if="onlyOneChild.meta" :to="resolvePath(onlyOneChild.path, onlyOneChild.query)">
        <el-menu-item :index="resolvePath(onlyOneChild.path)" :class="{ 'submenu-title-noDropdown': !isNest }">
          <svg-icon :icon-class="onlyOneChild.meta.icon || (item.meta && item.meta.icon)"/>
          <template #title><span class="menu-title" :title="hasTitle(getMenuTitleComputed(onlyOneChild.meta.title))">{{ getMenuTitleComputed(onlyOneChild.meta.title) }}</span></template>
        </el-menu-item>
      </app-link>
    </template>

    <el-sub-menu v-else ref="subMenu" :index="resolvePath(item.path)" teleported>
      <template v-if="item.meta" #title>
        <svg-icon :icon-class="item.meta && item.meta.icon" />
        <span class="menu-title" :title="hasTitle(getMenuTitleComputed(item.meta.title))">{{ getMenuTitleComputed(item.meta.title) }}</span>
      </template>

        <sidebar-item
          v-for="(child, index) in item.children"
          :key="`${child.path}-${index}-${locale.value}`"
          :is-nest="true"
          :item="child"
          :base-path="resolvePath(child.path)"
          class="nest-menu"
        />
    </el-sub-menu>
  </div>
</template>

<script setup>
import { computed, watchEffect } from 'vue'
import { isExternal } from '@/utils/validate'
import AppLink from './Link'
import { getNormalPath } from '@/utils/ruoyi'
import { useI18n } from '@/composables/useI18n'

const { t, locale } = useI18n()

const props = defineProps({
  // route object
  item: {
    type: Object,
    required: true
  },
  isNest: {
    type: Boolean,
    default: false
  },
  basePath: {
    type: String,
    default: ''
  }
})

const onlyOneChild = ref({})

function hasOneShowingChild(children = [], parent) {
  if (!children) {
    children = []
  }
  const showingChildren = children.filter(item => {
    if (item.hidden) {
      return false
    }
    onlyOneChild.value = item
    return true
  })

  // When there is only one child router, the child router is displayed by default
  if (showingChildren.length === 1) {
    return true
  }

  // Show parent if there are no child router to display
  if (showingChildren.length === 0) {
    onlyOneChild.value = { ...parent, path: '', noShowingChildren: true }
    return true
  }

  return false
}

function resolvePath(routePath, routeQuery) {
  if (isExternal(routePath)) {
    return routePath
  }
  if (isExternal(props.basePath)) {
    return props.basePath
  }
  if (routeQuery) {
    let query = JSON.parse(routeQuery)
    return { path: getNormalPath(props.basePath + '/' + routePath), query: query }
  }
  return getNormalPath(props.basePath + '/' + routePath)
}

function hasTitle(title){
  if (title && title.length > 5) {
    return title
  } else {
    return ""
  }
}

// 获取菜单标题，响应语言变化（参考 ruoyi-ui 的 generateTitle 实现）
function getMenuTitleComputed(title) {
  if (!title) return ''
  
  // 访问响应式的 locale.value 来建立依赖关系
  // 当 locale 变化时，由于 key 的变化会强制重新渲染，这个函数会被重新执行
  const currentLocale = locale.value
  
  // 如果是 i18n key（包含点号），使用翻译
  if (title.includes('.')) {
    return t(title)
  }
  // 否则直接返回原文本
  return title
}
</script>
