<template>

  <a-select
    v-if="async"
    showSearch
    labelInValue
    @search="loadData"
    :placeholder="placeholder"
    v-model="selectedAsyncValue"
    style="width: 100%"
    :filterOption="false"
    @change="handleAsyncChange"
    :notFoundContent="loading ? undefined : null"
  >
    <a-spin v-if="loading" slot="notFoundContent" size="small"/>
    <a-select-option v-for="d in options" :key="d.value" :value="d.value">{{ d.text }}</a-select-option>
  </a-select>

  <a-select
    v-else
    showSearch
    :placeholder="placeholder"
    optionFilterProp="children"
    style="width: 100%"
    @change="handleChange"
    :filterOption="filterOption"
    v-model="selectedValue"
    :notFoundContent="loading ? undefined : null">
    <a-spin v-if="loading" slot="notFoundContent" size="small"/>
    <a-select-option v-for="d in options" :key="d.value" :value="d.value">{{ d.text }}</a-select-option>
  </a-select>

</template>

<script>
  import { ajaxGetDictItems } from '@/api/api'
  import debounce from 'lodash/debounce';
  import { getAction } from '../../api/manage'

  export default {
    name: 'JSearchSelectTag',
    props:{
      triggerChange: Boolean,
      disabled: Boolean,
      value: String,
      dictCode: String,
      dictOptions: Array,
      async: Boolean,
      placeholder:{
        type:String,
        default:"请选择",
        required:false
      }
    },
    data(){
      this.loadData = debounce(this.loadData, 800);//消抖
      this.lastLoad = 0;
      return {
        loading:false,
        selectedValue:[],
        selectedAsyncValue:[],
        options: [],
      }
    },
    created(){
      this.initDictData();
    },
    watch:{
      "value":{
        immediate:true,
        handler(val){
          if(!val){
            this.selectedValue=[]
            this.selectedAsyncValue=[]
          }else{
            this.initSelectValue()
          }
        }
      }
    },
    methods:{
      initSelectValue(){
        if(this.async){
          if(!this.selectedAsyncValue || !this.selectedAsyncValue.key || this.selectedAsyncValue.key!=this.value){
            console.log("这才请求后台")
            getAction(`/sys/dict/loadDictItem/${this.dictCode}`,{key:this.value}).then(res=>{
              if(res.success){
                let obj = {
                  key:this.value,
                  label:res.result
                }
                this.selectedAsyncValue = {...obj}
              }
            })
          }
        }else{
          this.selectedValue = this.value
        }
      },
      loadData(value){
        console.log("数据加载",value)
        this.lastLoad +=1
        const currentLoad = this.lastLoad
        this.options = []
        this.loading=true
        // 字典code格式：table,text,code
        getAction(`/sys/dict/loadDict/${this.dictCode}`,{keyword:value}).then(res=>{
          this.loading=false
          if(res.success){
            if(currentLoad!=this.lastLoad){
              return
            }
            this.options = res.result
            console.log("我是第一个",res)
          }else{
            this.$message.warning(res.message)
          }

        })

      },
      initDictData(){
        if(!this.async){
          //如果字典项集合有数据
          if(this.dictOptions && this.dictOptions.length>0){
            this.options = [...this.dictOptions]
          }else{
            //根据字典Code, 初始化字典数组
            ajaxGetDictItems(this.dictCode, null).then((res) => {
              if (res.success) {
                this.options = res.result;
              }
            })
          }
        }
      },
      filterOption(input, option) {
        return option.componentOptions.children[0].text.toLowerCase().indexOf(input.toLowerCase()) >= 0
      },
      handleChange (selectedValue) {
        console.log("selectedValue",selectedValue)
        this.selectedValue = selectedValue
        this.callback()
      },
      handleAsyncChange(selectedObj){
        this.selectedAsyncValue = selectedObj
        this.selectedValue = selectedObj.key
        this.callback()
      },
      callback(){
        if(this.triggerChange){
          this.$emit('change', this.selectedValue);
        }else{
          this.$emit('input', this.selectedValue);
        }
      },
      setCurrentDictOptions(dictOptions){
        this.options = dictOptions
      },
      getCurrentDictOptions(){
        return this.options
      }

    }
  }
</script>

<style scoped>

</style>