<template>
  <div class="d-form-field d-select">
    <van-field
      readonly
      :value="displayValue"
      :label="label"
      :name="name"
      :class="{
        'field-border': border,
        'field-large': size == 'large',
        'field-small': size == 'small',
      }"
      :placeholder="placeholder"
      right-icon="arrow"
      :required="_required"
      :sfield="sfield"
      :disabled="disabled"
      :rules="rules"
      @click="showPicker = !disabled && true"
    />
    <van-popup :get-container="getContainer" round position="bottom" v-model="showPicker">
      <van-picker
        show-toolbar
        :title="'选择' + label"
        :columns="columns"
        :value-key="valueKey"
        @confirm="confirm"
        @cancel="showPicker = false"
      />
    </van-popup>
  </div>
</template>

<script lang="ts">
import { Component, Vue, Prop, Watch } from "vue-property-decorator";
import DictService from "@/services/dict.service";
/**
 * @Description 下拉选择器
 * @Author ZPFly
 * @Date 2021/11/3 10:19
 */
@Component({
  name: "DSelect",
})
export default class DSelect extends Vue {
  @Prop({ default: "" }) value: string | undefined; // 当前选择器的值
  @Prop({ default: "" }) label: string | undefined; // 输入框左侧文本
  @Prop({ default: "" }) sfield: string | undefined; // 下拉框选择
  @Prop({ default: "" }) placeholder: string | undefined; // 输入框占位提示文字
  @Prop({ default: "" }) name: string | undefined; // 名称，提交表单的标识符
  @Prop({ default: "" }) size: string | undefined; // 大小，可选值为 large small
  @Prop({ default: false }) disabled: boolean | undefined; //是否禁用输入框
  @Prop({ default: false }) required: boolean | undefined; //是否显示表单必填星号
  @Prop({ default: true }) isLink: boolean | undefined; //是否展示右侧箭头并开启点击反馈
  // @Prop({ default: () => [] }) columns: any[] | undefined; //选项列表
  @Prop({ default: () => [] }) options!: any[]; //选项列表
  @Prop({ default: "text" }) valueKey: string | undefined; //选项对象中，选项文字对应的键名
  @Prop({ default: false }) border: false | undefined; // 显示边框
  @Prop({ default: () => [] }) rules: any[] | undefined; // 校验规则
  @Prop({ default: ""}) getContainer: string | undefined; // 校验规则

  _value: any = ""; // 选择器的值
  _valueKey: any = ""; // 选项对象中，选项文字对应的键名
  showPicker = false; // 显示选择器
  displayValue = ""; // 选中对象的文字
  columns:any[] = this.options;// //选项列表
  tmpIndex = 0;

  // 是否必输项
  get _required() {
    const rules = this.rules || [];
    let required = this.required || false;
    for (const item in rules) {
      required = required || rules[item].required;
    }
    return required;
  }
  /**
   * @Description 获取表单展示文本
   * @Author ZPFly
   * @Date 2021/11/3 9:38
   */
  upDateDisplayValue() {
    const cols: any = this.columns;
    if (cols.length) {
      if (typeof cols[0] == "string") {
        this.displayValue = this._value;
      } else {
        // 根据选项值，找到选项
        const obj = this.columns?.find((item) => {
          return item.value == this._value;
        });
        this.displayValue = obj ? obj[this._valueKey] : "";
      }
    } else {
      this.displayValue = "";
    }
  }
  @Watch("columns")
  updateDisplay() {
    this.upDateDisplayValue();
  }
  @Watch("value")
  reBuildvalue(val:String) {
    this.setValue(val);
  }
  /**
   * @Description 生命周期
   * @Author ZPFly
   * @Date 2021/11/3 9:57
   */
  mounted() {
    this._value = this.value;
    this._valueKey = this.valueKey;
    this.upDateDisplayValue();
    if (this.sfield && this.sfield != "") {
      this.initOptions();
    }
  }

  setValue(value: any) {
    const opts = this.columns || [];
    if (value == '') {
      this.displayValue = '';
      return;
    }
    for (let i = 0; i < opts.length; i++) {
      if (this.value == opts[i].value) {
        this.displayValue = opts[i].text;
        this.tmpIndex = i;
        return;
      }
    }
  }
  //数据字典
  // @Watch("sfield")
  initOptions() {
    if (this.sfield && this.sfield != "") {
      this.sfield = this.sfield + "";
      const options = DictService.getOptions(this.sfield);
      console.log(options);
      this.columns = options;
      // if (!this.options) {
      //   var me = this,
      //     dataDics = me.dataDics.getOptions(me.sfield);
      //   console.log(dataDics);
      //   me.columns = dataDics[me.sfield] || dataDics;
      // } else {
      //   this.columns = this.options;
      // }
      this.setValue(this.value);
    }
  }
  /**
   * @Description 点击完成按钮时触发
   * @Author ZPFly
   * @Date 2021/11/3 9:57
   */
  confirm(val: any) {
    if (typeof val == "object") {
      this.displayValue = val[this._valueKey];
      this.$emit("input", val.value);
    } else {
      this.displayValue = val;
      this.$emit("input", val);
    }
    this.showPicker = false;
  }
  /**
   * @Description 根据索引获取选项
   * @Author ZPFly
   * @Date 2021/11/3 9:54
   */
  getItemByIndex(index: number) {
    const columns = this.columns || [];
    return columns.length > index ? columns[index] : null;
  }
}
</script>

<style scoped lang="scss"></style>