<template>
  <view class="mpvue-picker">
    <view
      :class="{ pickerMask: showPicker }"
      @click="maskClick"
      catchtouchmove="true"
    ></view>
    <view
      class="mpvue-picker-content"
      :class="{ 'mpvue-picker-view-show': showPicker }"
    >
      <view class="mpvue-picker__hd" catchtouchmove="true">
        <view class="mpvue-picker__action" @click="pickerCancel">取消</view>
        <view
          class="mpvue-picker__action"
          :style="{ color: themeColor }"
          @click="pickerConfirm"
        >
          确定
        </view>
      </view>
      <picker-view
        indicator-style="height: 40px;"
        class="mpvue-picker-view"
        :value="pickerValue"
        @change="pickerChange"
      >
        <block>
          <picker-view-column>
            <view
              class="picker-item"
              v-for="(item, index) in provinceDataList"
              :key="index"
            >
              {{ item.label }}
            </view>
          </picker-view-column>
          <picker-view-column>
            <view
              class="picker-item"
              v-for="(item, index) in cityDataList"
              :key="index"
            >
              {{ item.label }}
            </view>
          </picker-view-column>
          <picker-view-column>
            <view
              class="picker-item"
              v-for="(item, index) in areaDataList"
              :key="index"
            >
              {{ item.label }}
            </view>
          </picker-view-column>
        </block>
      </picker-view>
    </view>
  </view>
</template>

<script>
import { GetAppDistrict } from "../../api/audit";
export default {
  data() {
    return {
      pickerValue: [0, 0, 0],
      provinceDataList: [],
      cityDataList: [],
      areaDataList: [],
      /* 是否显示控件 */
      showPicker: false,
      provinceData: [],
      cityData: [],
      areaData: [],
    };
  },
  created() {
    this.init();
  },
  props: {
    /* 默认值 */
    pickerValueDefault: {
      type: Array,
      default() {
        return [0, 0, 0];
      },
    },
    /* 主题色 */
    themeColor: String,
  },
  watch: {
    pickerValueDefault() {
      this.init();
    },
  },
  methods: {
    async init() {
   
      let that = this;
      // 读取地区数据 【为了不同项目的小程序包体大小考虑，这里不能直接把数据放前端，可以使用服务端缓存和浏览器与小程序的本地存储来优化】
      let district_data = uni.getStorageSync("district_data");
      if (!district_data) {
        let res = await GetAppDistrict();
        if (res && res.status == 200) {
          uni.setStorageSync("district_data", res.data);
          that.setDistrictData(res.data);
        }
      } else {
        that.setDistrictData(district_data);
      }
    },

    setDistrictData(district_data) {
      this.provinceData = district_data.provinceData;
      this.cityData = district_data.cityData;
      this.areaData = district_data.areaData;

      this.handPickValueDefault(); // 对 pickerValueDefault 做兼容处理

      this.provinceDataList = district_data.provinceData;
      this.cityDataList = district_data.cityData[this.pickerValueDefault[0]];

      this.areaDataList =
        district_data.areaData[this.pickerValueDefault[0]][
          this.pickerValueDefault[1]
        ];
      this.pickerValue = this.pickerValueDefault;
    },

    show() {
      setTimeout(() => {
        this.showPicker = true;
      }, 0);
    },
    maskClick() {
      this.pickerCancel();
    },
    pickerCancel() {
      this.showPicker = false;
      this._$emit("onCancel");
    },
    pickerConfirm(e) {
      this.showPicker = false;
      this._$emit("onConfirm");
    },
    showPickerView() {
      this.showPicker = true;
    },

    handPickValueDefault() {
      let that = this;

      /*
				//索引才是， 修正数据。

				for (let i = 0; i < provinceData; i++) {
					if (provinceData[i].value == this.pickerValueDefault[0]) {
						this.pickerValueDefault[0] = i;
						break;
					}
				}


				for (let i = 0; i < that.cityData[this.pickerValueDefault[0]]; i++) {
					if (cityData[this.pickerValueDefault[0]][i].value == this.pickerValueDefault[1]) {
						this.pickerValueDefault[1] = i;
						break;
					}
				}

				for (let i = 0; i < that.areaData[this.pickerValueDefault[0]][this.pickerValueDefault[1]]; i++) {
					if (areaData[this.pickerValueDefault[0]][this.pickerValueDefault[1]][i].value == this.pickerValueDefault[2]) {
						this.pickerValueDefault[2] = i;
						break;
					}
				}
        */

      if (this.pickerValueDefault !== [0, 0, 0]) {
        if (this.pickerValueDefault[0] > that.provinceData.length - 1) {
          this.pickerValueDefault[0] = that.provinceData.length - 1;
        }
        if (
          this.pickerValueDefault[1] >
          that.cityData[this.pickerValueDefault[0]].length - 1
        ) {
          this.pickerValueDefault[1] =
            that.cityData[this.pickerValueDefault[0]].length - 1;
        }
        if (
          this.pickerValueDefault[2] >
          that.areaData[this.pickerValueDefault[0]][this.pickerValueDefault[1]]
            .length -
            1
        ) {
          this.pickerValueDefault[2] =
            that.areaData[this.pickerValueDefault[0]][
              this.pickerValueDefault[1]
            ].length - 1;
        }
      }
    },
    pickerChange(e) {
      let that = this;
      let changePickerValue = e.mp.detail.value;
      if (this.pickerValue[0] !== changePickerValue[0]) {
        // 第一级发生滚动
        this.cityDataList = that.cityData[changePickerValue[0]];
        this.areaDataList = that.areaData[changePickerValue[0]][0];
        changePickerValue[1] = 0;
        changePickerValue[2] = 0;
      } else if (this.pickerValue[1] !== changePickerValue[1]) {
        // 第二级滚动
        this.areaDataList =
          that.areaData[changePickerValue[0]][changePickerValue[1]];
        changePickerValue[2] = 0;
      }
      this.pickerValue = changePickerValue;
      this._$emit("onChange");
    },
    _$emit(emitName) {
      let pickObj = {
        label: this._getLabel(),
        value: this._getVale(),
        cityCode: this._getCityCode(),
      };
      this.$emit(emitName, pickObj);
    },
    _getLabel() {
      let pcikerLabel = [
        this.provinceDataList[this.pickerValue[0]].label,
        this.cityDataList[this.pickerValue[1]].label,
        this.areaDataList[this.pickerValue[2]].label,
      ];

      return pcikerLabel;
    },
    _getVale() {
      let pcikerValue = [
        this.provinceDataList[this.pickerValue[0]].value,
        this.cityDataList[this.pickerValue[1]].value,
        this.areaDataList[this.pickerValue[2]].value,
      ];

      return pcikerValue;
    },
    _getCityCode() {
      return this.areaDataList[this.pickerValue[2]].value;
    },
  },
};
</script>

<style>
.pickerMask {
  position: fixed;
  z-index: 1000;
  top: 0;
  right: 0;
  left: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
}

.mpvue-picker-content {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  transition: all 0.3s ease;
  transform: translateY(100%);
  z-index: 3000;
}

.mpvue-picker-view-show {
  transform: translateY(0);
}

.mpvue-picker__hd {
  display: flex;
  padding: 9px 15px;
  background-color: #fff;
  position: relative;
  text-align: center;
  font-size: 17px;
}

.mpvue-picker__hd:after {
  content: " ";
  position: absolute;
  left: 0;
  bottom: 0;
  right: 0;
  height: 1px;
  border-bottom: 1px solid #e5e5e5;
  color: #e5e5e5;
  transform-origin: 0 100%;
  transform: scaleY(0.5);
}

.mpvue-picker__action {
  display: block;
  flex: 1;
  color: #1aad19;
}

.mpvue-picker__action:first-child {
  text-align: left;
  color: #888;
}

.mpvue-picker__action:last-child {
  text-align: right;
}

.picker-item {
  text-align: center;
  line-height: 40px;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 16px;
}

.mpvue-picker-view {
  position: relative;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 238px;
  background-color: rgba(255, 255, 255, 1);
}
</style>
