<template>
  <date-picker
    :class="['app-date-range', 'app-date-range--' + type]"
    :type="rangeType"
    :value="realVal"
    :placeholder="placeholder"
    :disabled="disabled"
    transfer
    @on-change="onChange"
    @on-open-change="onOpenChange"
  ></date-picker>
</template>

<script lang="ts">
import { Vue, Component, Prop, Watch } from "vue-property-decorator";
@Component({})
export default class AppDateRange extends Vue {
  /**
   * 是否禁用
   *
   * @type {string}
   * @memberof AppDateRange
   */
  @Prop({ default: false }) public disabled?: boolean;

  /**
   * placeholder
   *
   * @type {string}
   * @memberof AppDateRange
   */
  @Prop({ default: "请选择时间" }) public placeholder?: string;

  /**
   * 日期值格式化
   *
   * @type {string}
   * @memberof AppDateRange
   */
  @Prop() public valueFormat?: string;

  /**
   * 数据类型
   *
   * @type {string}
   * @memberof AppDateRange
   */
  @Prop({ default: "datetime" }) public type?: "datetime" | "date";

  /**
   * 开始属性名称
   *
   * @type {string}
   * @memberof AppDateRange
   */
  @Prop() public startField?: string;

  /**
   * 结束属性名称
   *
   * @type {string}
   * @memberof AppDateRange
   */
  @Prop() public endField?: string;

  /**
   * 传入表单数据
   *
   * @type {*}
   * @memberof AppDateRange
   */
  @Prop() public data?: any;

  /**
   * 实际组件维护的值
   *
   * @type {*}
   * @memberof AppDateRange
   */
  public realVal: any[] = [];

  /**
   * 是否修改过数据
   * @type {boolean}
   * @memberof AppDateRange
   */
  public modified: boolean = false;

  /**
   * iview组件类型`
   *
   * @type {string}
   * @memberof AppDateRange
   */
  get rangeType() {
    switch (this.type) {
      case "date":
        return "daterange";
      default:
        return "datetimerange";
    }
  }

  /**
   * 生命周期
   *
   * @type {string}
   * @memberof AppDateRange
   */
  created() {
    if (!this.startField) {
      this.$Notice.error({
        title: this.$t("app.commonWords.wrong") as string,
        desc: "没有配置开始属性",
      });
    }
    if (!this.endField) {
      this.$Notice.error({
        title: this.$t("app.commonWords.wrong") as string,
        desc: "没有配置结束属性",
      });
    }
  }

  /**
   * 监控表单属性 data 值
   *
   * @memberof AppDateRange
   */
  @Watch("data", { deep: true, immediate: true })
  onDataChange(newVal: any, oldVal: any) {
    if (newVal && this.startField && this.endField) {
      this.realVal = [newVal[this.startField], newVal[this.endField]];
      this.modified = false;
      console.log(this.realVal);
    }
  }

  /**
   * iview组件值变更事件（只更新realVal,不抛出）
   *
   * @memberof AppDateRange
   */
  onChange(values: any[]) {
    this.realVal = values;
    this.modified = true;
    if(values[0]==='' && values[1] === ''){
      //清空的情况，直接抛值，openChange会先触发，或不触发。
      this.$emit("change", this.startField!, null);
      this.$emit("change", this.endField!, null);
    }
  }

  /**
   * iview组件值关闭事件（如果数据有变更，则抛出change事件）
   *
   * @memberof AppDateRange
   */
  onOpenChange(isOpen: boolean) {
    if (!isOpen && this.modified) {
      const [start, end] = this.realVal;
      this.$emit("change", this.startField!, start);
      this.$emit("change", this.endField!, end);
    }
  }
}
</script>

<style lang="scss">
@import "./app-date-range.scss";
</style>