<template>
  <el-menu :default-active="activeMenu" mode="horizontal" @select="handleSelect" :ellipsis="false">
    <template v-for="(item, index) in topMenus">
      <el-menu-item :style="{'--theme': theme}" :index="item.path" :key="index" v-if="index < visibleNumber">
        <svg-icon :icon-class="item.meta.icon" />
        &nbsp;{{ item.meta.title }}
      </el-menu-item>
    </template>

    <!-- 顶部菜单超出数量折叠 -->
    <el-sub-menu :style="{'--theme': theme}" index="more" v-if="topMenus.length > visibleNumber">
      <template #title>更多菜单</template>
      <template v-for="(item, index) in topMenus">
        <el-menu-item :index="item.path" :key="index" v-if="index >= visibleNumber">
          <svg-icon :icon-class="item.meta.icon" />
          {{ item.meta.title }}
        </el-menu-item>
      </template>
    </el-sub-menu>
  </el-menu>
</template>

<script setup>
import { constantRoutes } from '@/router'
import { isHttp } from '@/utils/validate'
import { useRouter } from 'vue-router'

// 顶部栏初始数
const visibleNumber = ref(5)
// 是否为首次加载
const isFrist = ref(false)
// 当前激活菜单的 index
const currentIndex = ref(undefined)

const store = useStore()
const route = useRoute()
const router = useRouter()

// 主题颜色
const theme = computed(() => store.state.settings.theme)
// 所有的路由信息
const routers = computed(() => store.state.permission.topbarRouters)

// 顶部显示菜单
const topMenus = computed(() => {
  let topMenus = []
  routers.value.map((menu) => {
    if (menu.hidden !== true) {
      // 兼容顶部栏一级菜单内部跳转
      if (menu.path === '/') {
        topMenus.push(menu.children[0])
      } else {
        topMenus.push(menu)
      }
    }
  })
  return topMenus
})

// 设置子路由
const childrenMenus = computed(() => {
  let childrenMenus = []
  routers.value.map((router) => {
    for (let item in router.children) {
      if (router.children[item].parentPath === undefined) {
        if (router.path === '/') {
          router.children[item].path = '/redirect/' + router.children[item].path
        } else {
          if (!isHttp(router.children[item].path)) {
            router.children[item].path =
              router.path + '/' + router.children[item].path
          }
        }
        router.children[item].parentPath = router.path
      }
      childrenMenus.push(router.children[item])
    }
  })
  return constantRoutes.concat(childrenMenus)
})

// 默认激活的菜单
const activeMenu = computed(() => {
  const path = route.path
  let activePath = defaultRouter.value
  if (path.lastIndexOf('/') > 0) {
    const tmpPath = path.substring(1, path.length)
    activePath = '/' + tmpPath.substring(0, tmpPath.indexOf('/'))
  } else if ('/index' == path || '' == path) {
    if (!isFrist.value) {
      isFrist.value = true
    } else {
      activePath = 'index'
    }
  }
  let routes = activeRoutes(activePath)
  if (routes.length === 0) {
    activePath = currentIndex.value || defaultRouter.value

    console.log('activePath', activePath)
    activeRoutes(activePath)
  }
  return activePath
})
// 默认激活的路由
const defaultRouter = computed(() => {
  let router
  Object.keys(routers.value).some((key) => {
    if (!routers.value[key].hidden) {
      router = routers.value[key].path
      return true
    }
  })

  return router
})
function setVisibleNumber() {
  const width = document.body.getBoundingClientRect().width / 3
  visibleNumber.value = parseInt(width / 85)
}
function handleSelect(key, keyPath) {
  currentIndex.value = key
  if (isHttp(key)) {
    // http(s):// 路径新窗口打开
    window.open(key, '_blank')
  } else if (key.indexOf('/redirect') !== -1) {
    // /redirect 路径内部打开
    router.push({ path: key.replace("/redirect", "") }).catch(err => {});
  } else {
    // 显示左侧联动菜单
    activeRoutes(key)
  }
}
// 当前激活的路由
function activeRoutes(key) {
  var routes = []
  if (childrenMenus.value && childrenMenus.value.length > 0) {
    childrenMenus.value.map((item) => {
      if (key == item.parentPath || (key == 'index' && '' == item.path)) {
        routes.push(item)
      }
    })
  }
  if (routes.length > 0) {
    store.commit('SET_SIDEBAR_ROUTERS', routes)
  }
  return routes
}

onMounted(() => {
  window.addEventListener('resize', setVisibleNumber)
})
onBeforeUnmount(() => {
  window.removeEventListener('resize', setVisibleNumber)
})

onMounted(() => {
  setVisibleNumber()
})
</script>

<style lang="scss">
// .topmenu-container.el-menu--horizontal > .el-menu-item {
//   float: left;
//   height: 50px !important;
//   line-height: 50px !important;
//   color: #999093 !important;
//   padding: 0 5px !important;
//   margin: 0 10px !important;
// }
.el-menu--horizontal {
  border-bottom: 0px !important;
}
// .topmenu-container.el-menu--horizontal > .el-menu-item.is-active,
// .el-menu--horizontal > .el-sub-menu.is-active .el-submenu__title {
//   border-bottom: 0px solid #{"var(--theme)"} !important;
//   color: #303133;
// }

/* sub-menu item */
// .topmenu-container.el-menu--horizontal > .el-sub-menu .el-submenu__title {
//   float: left;
//   height: 50px !important;
//   line-height: 50px !important;
//   color: #999093 !important;
//   padding: 0 5px !important;
//   margin: 0 10px !important;
// }
</style>
