<template>
  <div :class="{ 'show': show }"
    class="header-search">
    <svg-icon class-name="search-icon"
      icon-class="search"
      @click.stop="click" />
    <el-select ref="headerSearchSelectRef"
      v-model="search"
      :remote-method="querySearch"
      filterable
      default-first-option
      remote
      placeholder="Search"
      class="header-search-select"
      @change="change">
      <el-option v-for="option in options"
        :key="option.item.path"
        :value="option.item"
        :label="option.item.title.join(' > ')" />
    </el-select>
  </div>
</template>

<script setup>
import Fuse from 'fuse.js'
import { routesFlat } from '@/utils'

import usePermissionStore from '@/store/modules/permission'

const search = ref('');
const options = ref([]);
const searchPool = ref([]);
const show = ref(false);
const fuse = ref(undefined);
const headerSearchSelectRef = ref(null);
const router = useRouter();
const routes = computed(() => usePermissionStore().routes);

function click() {
  show.value = !show.value
  if (show.value) {
    headerSearchSelectRef.value && headerSearchSelectRef.value.focus()
  }
};
function close() {
  headerSearchSelectRef.value && headerSearchSelectRef.value.blur()
  options.value = []
  show.value = false
}
function change(val) {
  const path = val.path;
  const query = val.query;
  if (isHttp(path)) {
    // http(s):// 路径新窗口打开
    const pindex = path.indexOf("http");
    window.open(path.substr(pindex, path.length), "_blank");
  } else {
    if (query) {
      router.push({ path: path, query: JSON.parse(query) });
    } else {
      router.push(path)
    }
  }

  search.value = ''
  options.value = []
  nextTick(() => {
    show.value = false
  })
}
function initFuse(list) {
  fuse.value = new Fuse(list, {
    shouldSort: true,
    threshold: 0.4,
    location: 0,
    distance: 100,
    minMatchCharLength: 1,
    keys: [{
      name: 'title',
      weight: 0.7
    }, {
      name: 'path',
      weight: 0.3
    }]
  })
}

function querySearch(query) {
  if (query !== '') {
    options.value = fuse.value.search(query)
  } else {
    options.value = []
  }
}

onMounted(() => {
  searchPool.value = routesFlat(routes.value);
})

watchEffect(() => {
  searchPool.value = routesFlat(routes.value)
})

watch(show, (value) => {
  if (value) {
    document.body.addEventListener('click', close)
  } else {
    document.body.removeEventListener('click', close)
  }
})

watch(searchPool, (list) => {
  initFuse(list)
})
</script>

<style lang='scss'
  scoped>
  .header-search {
    font-size: 0 !important;

    .search-icon {
      cursor: pointer;
      font-size: 18px;
      vertical-align: middle;
    }

    .header-search-select {
      font-size: 18px;
      transition: width 0.2s;
      width: 0;
      overflow: hidden;
      background: transparent;
      border-radius: 0;
      display: inline-block;
      vertical-align: middle;

      :deep(.el-input__inner) {
        border-radius: 0;
        border: 0;
        padding-left: 0;
        padding-right: 0;
        box-shadow: none !important;
        border-bottom: 1px solid #d9d9d9;
        vertical-align: middle;
      }
    }

    &.show {
      .header-search-select {
        width: 210px;
        margin-left: 10px;
      }
    }
  }
</style>