<template>
  <div class="autoComplete">
    <el-form style="margin:30px" label-width="180px" label-position="right">
      <el-form-item label="后端進行搜索并匹配：">
        <el-autocomplete placeholder="請輸入匹配內容" v-model="matchName" :fetch-suggestions="querySearchAsync"></el-autocomplete>
      </el-form-item>
      <el-form-item label="前端自行匹配：">
        <el-autocomplete placeholder="請輸入匹配內容" v-model="searchName" :fetch-suggestions="querySearch" @select="handleSelect"></el-autocomplete>
      </el-form-item>
    </el-form>
  </div>
</template>

<script>
import { getCurrentInstance, onMounted, reactive, ref } from 'vue'

export default {
  setup () {
    const { proxy } = getCurrentInstance()
    const searchName = ref('')
    const matchName = ref('')
    const totalData = ref([])
    let timeOut = reactive()

    /**獲取總查詢表信息 */
    const getList = () => {
      try {
        // 這里應該請求接口
        totalData.value = list
      } catch (error) {
        proxy.$message.error(error.message)
      }
    }

    /**搜索結果 */
    const querySearch = (querySearch, cb) => {
      let results = []
      if (querySearch) {
        const findout = totalData.value.filter((x) => nameFilter(x, querySearch))
        results = findout.map(x => ({ ...x, value: x.label }))
      } else {
        results = totalData.value.map(x => ({ ...x, value: x.label }))
      }

      console.log(results, '結果')
      clearTimeout(timeOut)
      timeOut = setTimeout(() => {
        cb(results)
      }, 1000);
    }

    /**選擇的結果 */
    const handleSelect = (item) => {
      console.log(item, '選擇結果')
      searchName.value = "[label：" + item.label + "； name：" + item.name + "]"
    }

    /**模糊匹配方法 */
    const nameFilter = (item, querySearch) => {
      return item.label.toLowerCase().match(querySearch.toLowerCase()) ? true : false
    }

    /**首字母匹配法 */
    const firstCharFilter = (item, querySearch) =>
      item.label.toLowerCase().indexOf(querySearch.toLowerCase()) === 0


    /**請求后端接口檢索 */
    const querySearchAsync = (querySearch, cb) => {
      let results = []
      if (querySearch === '') {
        cb(results)
      } else {
        try {
          // 請求接口
          const res = []
          results = res
          cb(results)
        } catch (error) {
          proxy.$message.error(error.message)
        }
      }
    }

    onMounted(() => {
      getList()
    })

    const list = [
      { id: 101, label: "angle", name: "角；角度" },
      { id: 102, label: "ant", name: "螞蟻" },
      { id: 103, label: "apple", name: "蘋果" },
      { id: 104, label: "arch", name: "拱形；弧形" },
      { id: 105, label: "arm", name: "臂" },
      { id: 106, label: "army", name: "軍隊" },
      { id: 107, label: "baby", name: "嬰兒" },
      { id: 108, label: "bag", name: "袋" },
      { id: 109, label: "ball", name: "球" },
      { id: 122, label: "bone", name: "骨" },
      { id: 123, label: "book", name: "書" },
      { id: 124, label: "boot", name: "靴" },
      { id: 125, label: "bottle", name: "瓶子" },
      { id: 126, label: "box", name: "箱；盒" },
      { id: 127, label: "boy", name: "男孩" },
      { id: 128, label: "brain", name: "腦" },
      { id: 129, label: "brake", name: "煞車" },
      { id: 130, label: "branch", name: "樹枝" },
      { id: 131, label: "brick", name: "磚" },
      { id: 132, label: "bridge", name: "橋" },
      { id: 133, label: "brush", name: "刷子" },
      { id: 134, label: "bucket", name: "水桶" },
      { id: 135, label: "bulb", name: "球莖；燈泡" },
      { id: 136, label: "button", name: "紐扣" },
      { id: 150, label: "clock", name: "時鐘" },
      { id: 151, label: "cloud", name: "云" },
      { id: 152, label: "coat", name: "外套，大衣" },
      { id: 153, label: "collar", name: "衣領" },
      { id: 154, label: "comb", name: "梳子" },
      { id: 155, label: "cord", name: "繩子" },
      { id: 156, label: "cow", name: "母牛" },
      { id: 157, label: "cup", name: "杯子" },
      { id: 158, label: "curtain", name: "簾；幕" },
      { id: 159, label: "cushion", name: "墊子" },
      { id: 160, label: "dog", name: "狗" },
      { id: 169, label: "eye", name: "眼睛" },
    ]

    return {
      searchName,
      matchName,
      querySearch,
      handleSelect,
      querySearchAsync

    }
  }
}

</script>