<template>
  <view class="uni-data-tree">
    <view class="uni-data-tree-input" @click="handleInput">
      <slot :options="options" :data="inputSelected" :error="errorMessage">
        <view class="input-value" :class="{'input-value-border': border}">
          <text v-if="errorMessage" class="selected-area error-text">{{errorMessage}}</text>
          <view v-else-if="loading && !isOpened" class="selected-area">
            <uni-load-more class="load-more" :contentText="loadMore" status="loading"></uni-load-more>
          </view>
          <scroll-view v-else-if="inputSelected.length" class="selected-area" scroll-x="true">
            <view class="selected-list">
              <view class="selected-item" v-for="(item,index) in inputSelected" :key="index">
                <text class="text-color">{{item.text}}</text><text v-if="index<inputSelected.length-1"
                  class="input-split-line">{{split}}</text>
              </view>
            </view>
          </scroll-view>
          <text v-else class="selected-area placeholder">{{placeholder}}</text>
          <view v-if="clearIcon && !readonly && inputSelected.length" class="icon-clear" @click.stop="clear">
            <uni-icons type="clear" color="#c0c4cc" size="24"></uni-icons>
          </view>
          <view class="arrow-area" v-if="(!clearIcon || !inputSelected.length) && !readonly ">
            <view class="input-arrow"></view>
          </view>
        </view>
      </slot>
    </view>
    <view class="uni-data-tree-cover" v-if="isOpened" @click="handleClose"></view>
    <view class="uni-data-tree-dialog" v-if="isOpened">
      <view class="uni-popper__arrow"></view>
      <view class="dialog-caption">
        <view class="title-area">
          <text class="dialog-title">{{popupTitle}}</text>
        </view>
        <view class="dialog-close" @click="handleClose">
          <view class="dialog-close-plus" data-id="close"></view>
          <view class="dialog-close-plus dialog-close-rotate" data-id="close"></view>
        </view>
      </view>
      <data-picker-view class="picker-view" ref="pickerView" v-model="dataValue" :localdata="localdata"
        :preload="preload" :collection="collection" :field="field" :orderby="orderby" :where="where"
        :step-searh="stepSearh" :self-field="selfField" :parent-field="parentField" :managed-mode="true" :map="map"
        :ellipsis="ellipsis" @change="onchange" @datachange="ondatachange" @nodeclick="onnodeclick">
      </data-picker-view>
    </view>
  </view>
</template>

<script>
  import dataPicker from "../uni-data-pickerview/uni-data-picker.js"
  import DataPickerView from "../uni-data-pickerview/uni-data-pickerview.vue"

  /**
   * DataPicker 级联选择
   * @description 支持单列、和多列级联选择。列数没有限制，如果屏幕显示不全，顶部tab区域会左右滚动。
   * @tutorial https://ext.dcloud.net.cn/plugin?id=3796
   * @property {String} popup-title 弹出窗口标题
   * @property {Array} localdata 本地数据，参考
   * @property {Boolean} border = [true|false] 是否有边框
   * @property {Boolean} readonly = [true|false] 是否仅读
   * @property {Boolean} preload = [true|false] 是否预加载数据
   * @value true 开启预加载数据，点击弹出窗口后显示已加载数据
   * @value false 关闭预加载数据，点击弹出窗口后开始加载数据
   * @property {Boolean} step-searh = [true|false] 是否分布查询
   * @value true 启用分布查询，仅查询当前选中节点
   * @value false 关闭分布查询，一次查询出所有数据
   * @property {String|DBFieldString} self-field 分布查询当前字段名称
   * @property {String|DBFieldString} parent-field 分布查询父字段名称
   * @property {String|DBCollectionString} collection 表名
   * @property {String|DBFieldString} field 查询字段，多个字段用 `,` 分割
   * @property {String} orderby 排序字段及正序倒叙设置
   * @property {String|JQLString} where 查询条件
   * @event {Function} popupshow 弹出的选择窗口打开时触发此事件
   * @event {Function} popuphide 弹出的选择窗口关闭时触发此事件
   */
  export default {
    name: 'UniDataPicker',
    emits: ['popupopened', 'popupclosed', 'nodeclick', 'input', 'change', 'update:modelValue','inputclick'],
    mixins: [dataPicker],
    components: {
      DataPickerView
    },
    props: {
      options: {
        type: [Object, Array],
        default () {
          return {}
        }
      },
      popupTitle: {
        type: String,
        default: '请选择'
      },
      placeholder: {
        type: String,
        default: '请选择'
      },
      heightMobile: {
        type: String,
        default: ''
      },
      readonly: {
        type: Boolean,
        default: false
      },
      clearIcon: {
        type: Boolean,
        default: true
      },
      border: {
        type: Boolean,
        default: true
      },
      split: {
        type: String,
        default: '/'
      },
      ellipsis: {
        type: Boolean,
        default: true
      }
    },
    data() {
      return {
        isOpened: false,
        inputSelected: []
      }
    },
    created() {
      this.$nextTick(() => {
        this.load();
      })
    },
    watch: {
			localdata: {
				handler() {
					this.load()
				},
        deep: true
			},
    },
    methods: {
      clear() {
        this._dispatchEvent([]);
      },
      onPropsChange() {
        this._treeData = [];
        this.selectedIndex = 0;

        this.load();
      },
      load() {
        if (this.readonly) {
          this._processReadonly(this.localdata, this.dataValue);
          return;
        }

        // 回显本地数据
        if (this.isLocalData) {
          this.loadData();
          this.inputSelected = this.selected.slice(0);
        } else if (this.isCloudDataList || this.isCloudDataTree) { // 回显 Cloud 数据
          this.loading = true;
          this.getCloudDataValue().then((res) => {
            this.loading = false;
            this.inputSelected = res;
          }).catch((err) => {
            this.loading = false;
            this.errorMessage = err;
          })
        }
      },
      show() {
        this.isOpened = true
        setTimeout(() => {
          this.$refs.pickerView.updateData({
            treeData: this._treeData,
            selected: this.selected,
            selectedIndex: this.selectedIndex
          })
        }, 200)
        this.$emit('popupopened')
      },
      hide() {
        this.isOpened = false
        this.$emit('popupclosed')
      },
      handleInput() {
        if (this.readonly) {
					this.$emit('inputclick')
          return
        }
        this.show()
      },
      handleClose(e) {
        this.hide()
      },
      onnodeclick(e) {
        this.$emit('nodeclick', e)
      },
      ondatachange(e) {
        this._treeData = this.$refs.pickerView._treeData
      },
      onchange(e) {
        this.hide()
        this.$nextTick(() => {
          this.inputSelected = e;
        })
        this._dispatchEvent(e)
      },
      _processReadonly(dataList, value) {
        var isTree = dataList.findIndex((item) => {
          return item.children
        })
        if (isTree > -1) {
          let inputValue
          if (Array.isArray(value)) {
            inputValue = value[value.length - 1]
            if (typeof inputValue === 'object' && inputValue.value) {
              inputValue = inputValue.value
            }
          } else {
            inputValue = value
          }
          this.inputSelected = this._findNodePath(inputValue, this.localdata)
          return
        }

        if (!this.hasValue) {
          this.inputSelected = []
          return
        }

        let result = []
        for (let i = 0; i < value.length; i++) {
          var val = value[i]
          var item = dataList.find((v) => {
            return v.value == val
          })
          if (item) {
            result.push(item)
          }
        }
        if (result.length) {
          this.inputSelected = result
        }
      },
      _filterForArray(data, valueArray) {
        var result = []
        for (let i = 0; i < valueArray.length; i++) {
          var value = valueArray[i]
          var found = data.find((item) => {
            return item.value == value
          })
          if (found) {
            result.push(found)
          }
        }
        return result
      },
      _dispatchEvent(selected) {
        let item = {}
        if (selected.length) {
          var value = new Array(selected.length)
          for (var i = 0; i < selected.length; i++) {
            value[i] = selected[i].value
          }
          item = selected[selected.length - 1]
        } else {
          item.value = ''
        }
        if (this.formItem) {
          this.formItem.setValue(item.value)
        }

        this.$emit('input', item.value)
        this.$emit('update:modelValue', item.value)
        this.$emit('change', {
          detail: {
            value: selected
          }
        })
      }
    }
  }
</script>

<style>
  .uni-data-tree {
    flex: 1;
    position: relative;
    font-size: 14px;
  }

  .error-text {
    color: #DD524D;
  }

  .input-value {
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    flex-direction: row;
    align-items: center;
    flex-wrap: nowrap;
    font-size: 14px;
    /* line-height: 35px; */
    padding: 0 10px;
    padding-right: 5px;
    overflow: hidden;
    height: 35px;
    /* #ifndef APP-NVUE */
    box-sizing: border-box;
    /* #endif */
  }

  .input-value-border {
    border: 1px solid #e5e5e5;
    border-radius: 5px;
  }

  .selected-area {
    flex: 1;
    overflow: hidden;
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    flex-direction: row;
  }

  .load-more {
    /* #ifndef APP-NVUE */
    margin-right: auto;
    /* #endif */
    /* #ifdef APP-NVUE */
    width: 40px;
    /* #endif */
  }

  .selected-list {
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    flex-direction: row;
    flex-wrap: nowrap;
    /* padding: 0 5px; */
  }

  .selected-item {
    flex-direction: row;
    /* padding: 0 1px; */
    /* #ifndef APP-NVUE */
    white-space: nowrap;
    /* #endif */
  }

  .text-color {
    color: #333;
  }

  .placeholder {
    color: grey;
    font-size: 12px;
  }

  .input-split-line {
    opacity: .5;
  }

  .arrow-area {
    position: relative;
    width: 20px;
    /* #ifndef APP-NVUE */
    margin-bottom: 5px;
    margin-left: auto;
    display: flex;
    /* #endif */
    justify-content: center;
    transform: rotate(-45deg);
    transform-origin: center;
  }

  .input-arrow {
    width: 7px;
    height: 7px;
    border-left: 1px solid #999;
    border-bottom: 1px solid #999;
  }

  .uni-data-tree-cover {
    position: fixed;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, .4);
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    flex-direction: column;
    z-index: 100;
  }

  .uni-data-tree-dialog {
    position: fixed;
    left: 0;
    /* #ifndef APP-NVUE */
    top: 20%;
    /* #endif */
    /* #ifdef APP-NVUE */
    top: 200px;
    /* #endif */
    right: 0;
    bottom: 0;
    background-color: #FFFFFF;
    border-top-left-radius: 10px;
    border-top-right-radius: 10px;
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    flex-direction: column;
    z-index: 102;
    overflow: hidden;
    /* #ifdef APP-NVUE */
    width: 750rpx;
    /* #endif */
  }

  .dialog-caption {
    position: relative;
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    flex-direction: row;
    /* border-bottom: 1px solid #f0f0f0; */
  }

  .title-area {
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    align-items: center;
    /* #ifndef APP-NVUE */
    margin: auto;
    /* #endif */
    padding: 0 10px;
  }

  .dialog-title {
    /* font-weight: bold; */
    line-height: 44px;
  }

  .dialog-close {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    flex-direction: row;
    align-items: center;
    padding: 0 15px;
  }

  .dialog-close-plus {
    width: 16px;
    height: 2px;
    background-color: #666;
    border-radius: 2px;
    transform: rotate(45deg);
  }

  .dialog-close-rotate {
    position: absolute;
    transform: rotate(-45deg);
  }

  .picker-view {
    flex: 1;
    overflow: hidden;
  }

  .icon-clear {
    display: flex;
    align-items: center;
  }

  /* #ifdef H5 */
  @media all and (min-width: 768px) {
    .uni-data-tree-cover {
      background-color: transparent;
    }

    .uni-data-tree-dialog {
      position: absolute;
      top: 55px;
      height: auto;
      min-height: 400px;
      max-height: 50vh;
      background-color: #fff;
      border: 1px solid #EBEEF5;
      box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
      border-radius: 4px;
      overflow: unset;
    }

    .dialog-caption {
      display: none;
    }

    .icon-clear {
      /* margin-right: 5px; */
    }
  }

  /* #endif */

  /* picker 弹出层通用的指示小三角, todo：扩展至上下左右方向定位 */
  /* #ifndef APP-NVUE */
  .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;
  }

  /* #endif */
</style>
