<template>
  <view class="uni-combox" :class="border ? '' : 'uni-combox__no-border'">
    <view v-if="label" class="uni-combox__label" :style="labelStyle">
      <text>{{label}}</text>
    </view>
    <view class="uni-combox__input-box">
      <input class="uni-combox__input" type="text" :placeholder="placeholder" placeholder-class="uni-combox__input-plac"
        v-model="inputVal" @input="onInput" @focus="onFocus" @blur="onBlur" />
      <uni-icons :type="showSelector? 'top' : 'bottom'" size="14" color="#999" @click="toggleSelector">
      </uni-icons>
    </view>
    <view class="uni-combox__selector" v-if="showSelector">
      <view class="uni-popper__arrow"></view>
      <scroll-view scroll-y="true" class="uni-combox__selector-scroll" @scroll="onScroll">
        <view class="uni-combox__selector-empty" v-if="filterCandidatesLength === 0">
          <text>{{emptyTips}}</text>
        </view>
        <view class="uni-combox__selector-item" v-for="(item,index) in filterCandidates" :key="index"
          @click="onSelectorClick(index)">
          <text>{{item[`${labelKey}`]}}</text>
        </view>
      </scroll-view>
    </view>
    <uni-icons style="padding-left:20rpx;" class="content-clear-icon" type="clear" color="#c0c4cc" v-if="inputVal"
      @click="onClear"></uni-icons>
    <!-- :size="clearSize"
		:color="msg ? '#dd524d' : focusShow ? primaryColor : '#c0c4cc'" -->
    <!-- 新增蒙层，点击蒙层时关闭选项显示 -->
    <view class="uni-combox__mask" v-show="showSelector" @click="showSelector = false"></view>
  </view>
 
</template>
 
<script>
  import {
    nextTick
  } from 'vue'
  /**
   * Combox 组合输入框
   * @description 组合输入框一般用于既可以输入也可以选择的场景
   * @tutorial https://ext.dcloud.net.cn/plugin?id=1261
   * @property {String} label 左侧文字
   * @property {String} labelWidth 左侧内容宽度
   * @property {String} placeholder 输入框占位符
   * @property {Array} scorePeople 候选项列表
   * @property {String} emptyTips 筛选结果为空时显示的文字
   * @property {String} value 组合框的值
   */
  export default {
    name: 'uniCombox',
    emits: ['input', 'update:modelValue', 'change'],
    props: {
      border: {
        type: Boolean,
        default: true
      },
      label: {
        type: String,
        default: ''
      },
      labelWidth: {
        type: String,
        default: 'auto'
      },
      placeholder: {
        type: String,
        default: ''
      },
      scorePeople: {
        type: Array,
        default () {
          return []
        }
      },
      emptyTips: {
        type: String,
        default: '无匹配项'
      },
      labelKey: {
        type: String,
        default: 'dictName'
      },
      valueKey: {
        type: String,
        default: 'dictId'
      },
      // #ifndef VUE3
      value: {
        type: [String, Number],
        default: ''
      },
      // #endif
      // #ifdef VUE3
      modelValue: {
        type: [String, Number],
        default: ''
      },
      // #endif
    },
    data() {
      return {
        showSelector: false,
        inputVal: '',
        blurTimer: null,
        dictVal: "",
        filterCandidates: []
      }
    },
    computed: {
      labelStyle() {
        if (this.labelWidth === 'auto') {
          return ""
        }
        return `width: ${this.labelWidth}`
      },
 
      filterCandidatesLength() {
        console.log(this.filterCandidates)
        return this.filterCandidates.length
      }
    },
    watch: {
      // #ifndef VUE3
      value: {
        handler(newVal) {
          this.dictVal = newVal
        },
        immediate: true
      },
      // #endif
 
      // 因为获取列表是个异步的过程，需要对列表进行监听
      scorePeople: {
         handler(arr) {
           if (arr.length > 0 && this.dictVal) {
             let obj = arr.find((item, index) => {
               return this.dictVal == item[`${this.valueKey}`]
             })
             this.inputVal = obj[`${this.labelKey}`]
              this.$forceUpdate(); // 强制更新 DOM
           }
           this.filterCandidates = arr.filter((item) => {
             return item[`${this.labelKey}`].toString().indexOf(this.inputVal) > -1
           })
         },
         immediate: true,
         deep: true
       },
      // #ifdef VUE3
      modelValue: {
        handler(newVal) {
          // this.inputVal = newVal
          this.dictVal = newVal
          if (this.scorePeople.length > 0 && newVal) {
            let obj = this.scorePeople.find((item, index) => {
              return newVal == item[`${this.valueKey}`]
            })
            // 兼容当传入错误的id在待选列表找不到时候的错误
            if (obj) {
              this.inputVal = obj[`${this.labelKey}`]
            } else {
              this.inputVal = ''
            }
          } else if (!newVal) { //当传入的是空值时直接将上一次回填数据清空
            this.inputVal = ''
          }
        },
        immediate: true,
        deep: true,
      },
      // #endif
    },
    methods: {
      toggleSelector() {
        this.showSelector = !this.showSelector
      },
      onFocus() {
        this.filterCandidates = this.scorePeople
        this.showSelector = true
      },
      onBlur() {
        this.blurTimer = setTimeout(() => {
          this.showSelector = false
        }, 153)
      },
      onScroll() { // 滚动时将blur的定时器关掉
        if (this.blurTimer) {
          clearTimeout(this.blurTimer)
          this.blurTimer = null
        }
      },
      onSelectorClick(index) {
        // this.inputVal = this.filterCandidates[index]
        this.dictVal = this.filterCandidates[index][`${this.valueKey}`]
        //this.dictVal 的赋值一定要在this.inputVal前执行，
        //因为this.filterCandidates会监听this.inputVal的变化被重新赋值
        //这样在选择列表中非第一个选项会报错
        this.inputVal = this.filterCandidates[index][`${this.labelKey}`]
        this.showSelector = false
        this.$emit('input', this.dictVal)
        this.$emit('change', this.dictVal)
        this.$emit('update:modelValue', this.dictVal)
      },
      onInput() {
        this.filterCandidates = this.scorePeople.filter((item) => {
          console.log(item, this.labelKey)
          return item[`${this.labelKey}`].toString().indexOf(this.inputVal) > -1
        })
        setTimeout(() => {
          this.$emit('input', this.dictVal)
          this.$emit('update:modelValue', this.dictVal)
        })
      },
      /**
       * 清理内容
       * @param {Object} event
       */
      onClear(event) {
        this.inputVal = '';
      },
    }
  }
</script>
 
<style lang="scss">
  .uni-combox {
    font-size: 14px;
    border: 1px solid #DCDFE6;
    border-radius: 4px;
    // padding: 6px 10px;
    padding: 10px 6px 10px 0;
    position: relative;
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    // height: 40px;
    flex-direction: row;
    align-items: center;
    // border-bottom: solid 1px #DDDDDD;
  }
 
  .uni-combox__label {
    font-size: 16px;
    line-height: 22px;
    padding-right: 10px;
    color: #999999;
  }
 
  .uni-combox__input-box {
    padding-left: 10px;
    position: relative;
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    flex: 1;
    flex-direction: row;
    align-items: center;
  }
 
  .uni-combox__input {
    flex: 1;
    font-size: 14px;
    height: 22px;
    line-height: 22px;
  }
 
  .uni-combox__input-plac {
    font-size: 14px;
    color: #999;
  }
 
  .uni-combox__selector {
    /* #ifndef APP-NVUE */
    box-sizing: border-box;
    /* #endif */
    position: absolute;
    top: calc(100% + 12px);
    left: 0;
    width: 100%;
    background-color: #FFFFFF;
    border: 1px solid #EBEEF5;
    border-radius: 6px;
    box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
    z-index: 3;
    padding: 4px 0;
  }
 
  .uni-combox__selector-scroll {
    /* #ifndef APP-NVUE */
    max-height: 200px;
    box-sizing: border-box;
    /* #endif */
  }
 
  .uni-combox__selector-empty,
  .uni-combox__selector-item {
    /* #ifndef APP-NVUE */
    display: flex;
    cursor: pointer;
    /* #endif */
    line-height: 36px;
    font-size: 14px;
    text-align: center;
    // border-bottom: solid 1px #DDDDDD;
    padding: 0px 10px;
    white-space: nowrap;
    overflow: auto;
  }
 
  .uni-combox__selector-item::-webkit-scrollbar {
    width: 0;
    height: 0;
  }
 
  .uni-combox__selector-item:hover {
    background-color: #f9f9f9;
  }
 
  .uni-combox__selector-empty:last-child,
  .uni-combox__selector-item:last-child {
    /* #ifndef APP-NVUE */
    border-bottom: none;
    /* #endif */
  }
 
  // picker 弹出层通用的指示小三角
  .uni-popper__arrow,
  .uni-popper__arrow::after {
    position: absolute;
    display: block;
    width: 0;
    height: 0;
    border-color: transparent;
    border-style: solid;
    border-width: 6px;
  }
 
  .uni-popper__arrow {
    filter: drop-shadow(0 2px 12px rgba(0, 0, 0, 0.03));
    top: -6px;
    left: 10%;
    margin-right: 3px;
    border-top-width: 0;
    border-bottom-color: #EBEEF5;
  }
 
  .uni-popper__arrow::after {
    content: " ";
    top: 1px;
    margin-left: -6px;
    border-top-width: 0;
    border-bottom-color: #fff;
  }
 
  .uni-combox__no-border {
    border: none;
  }
 
  .uni-combox__mask {
    width: 100%;
    height: 100%;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1;
  }
</style>