<template>
  <div class="org-tree-container">
    <div class="org-tree" :class="{horizontal, collapsable}">
      <org-tree-node
        :data="data"
        :expandAlias="expandAlias"
        :childrenAlias="childrenAlias"
        :horizontal="horizontal"
        :collapsable="collapsable"
        @on-expand="handleExpand"
      >
        <template slot-scope="{ renderData, parentData, renderIndex }">
          <slot :renderData="renderData" :parentData="parentData" :renderIndex="renderIndex"></slot>
        </template>
      </org-tree-node>
    </div>
  </div>
</template>

<script>
import OrgTreeNode from './OrgTreeNode'
export default {
  name: 'OrgTree',
  components: {
    OrgTreeNode
  },
  props: {
    data: {
      type: Object,
      required: true
    },
    expandAlias: {
      type: String,
      default: 'expand'
    },
    childrenAlias: {
      type: String,
      default: 'children'
    },
    horizontal: {
      type: Boolean,
      default: true
    },
    collapsable: {
      type: Boolean,
      default: false
    }
  },
  methods: {
    handleExpand (data) {
      // 展开或收起子节点
      this.$set(data, this.expandAlias, !data[this.expandAlias])
    }
  }
}
</script>

<style lang="less">
.org-tree-container {
  display: inline-block;
  padding: 15px;
  background-color: #fff;
}

.org-tree {
  // display: inline-block;
  display: table;
  text-align: center;

  &:before,
  &:after {
    content: '';
    display: table;
  }

  &:after {
    clear: both;
  }
}

.org-tree-node,
.org-tree-node-children {
  position: relative;
  margin: 0;
  padding: 0;
  list-style-type: none;

  &:before,
  &:after {
    transition: all 0.35s;
  }
}
.org-tree-node-label {
  position: relative;
  display: inline-block;

  .org-tree-node-label-inner {
    padding: 10px 15px;
    text-align: center;
    border-radius: 3px;
    box-shadow: 0 1px 5px rgba(0, 0, 0, 0.15);
  }
}
.org-tree-node-btn {
  position: absolute;
  top: 100%;
  left: 50%;
  width: 20px;
  height: 20px;
  z-index: 10;
  margin-left: -11px;
  margin-top: 9px;
  background-color: #fff;
  border: 1px solid #ccc;
  border-radius: 50%;
  box-shadow: 0 0 2px rgba(0, 0, 0, 0.15);
  cursor: pointer;
  transition: all 0.35s ease;

  &:hover {
    background-color: #e7e8e9;
    transform: scale(1.15);
  }

  &:before,
  &:after {
    content: '';
    position: absolute;
  }

  &:before {
    top: 50%;
    left: 4px;
    right: 4px;
    height: 0;
    border-top: 1px solid #ccc;
  }

  &:after {
    top: 4px;
    left: 50%;
    bottom: 4px;
    width: 0;
    border-left: 1px solid #ccc;
  }

  &.expanded:after {
    border: none;
  }
}
.org-tree-node {
  padding-top: 20px;
  display: table-cell;
  vertical-align: top;

  &.is-leaf,
  &.collapsed {
    padding-left: 10px;
    padding-right: 10px;
  }

  &:before,
  &:after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 50%;
    height: 19px;
  }

  &:after {
    left: 50%;
    border-left: 1px solid #ddd;
  }

  &:not(:first-child):before,
  &:not(:last-child):after {
    border-top: 1px solid #ddd;
  }
}
&.collapsable .org-tree-node.collapsed {
  padding-bottom: 30px;

  .org-tree-node-label:after {
    content: '';
    position: absolute;
    top: 100%;
    left: 0;
    width: 50%;
    height: 20px;
    border-right: 1px solid #ddd;
  }
}
&.collapsable .org-tree-node.collapsed-not-child {
  .org-tree-node-label:after {
    border-right: 0 !important;
  }
}
.org-tree > .org-tree-node {
  padding-top: 0;

  &:after {
    border-left: 0;
  }
}
.org-tree-node-children {
  padding-top: 20px;
  display: table;

  &:before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    width: 0;
    height: 20px;
    border-left: 1px solid #ddd;
  }

  &:after {
    content: '';
    display: table;
    clear: both;
  }
}

.horizontal {
  .org-tree-node {
    // display: flex;
    // flex-direction: row;
    // justify-content: flex-start;
    // align-items: center;
    display: table-cell;
    float: none;
    padding-top: 0;
    padding-left: 20px;

    &.is-leaf,
    &.collapsed {
      padding-top: 10px;
      padding-bottom: 10px;
    }

    &:before,
    &:after {
      width: 19px;
      height: 50%;
    }

    &:after {
      top: 50%;
      left: 0;
      border-left: 0;
    }

    &:only-child:before {
      top: 1px;
      border-bottom: 1px solid #ddd;
    }

    &:not(:first-child):before,
    &:not(:last-child):after {
      border-top: 0;
      border-left: 1px solid #ddd;
    }

    &:not(:only-child):after {
      border-top: 1px solid #ddd;
    }

    .org-tree-node-inner {
      display: table;
    }
  }

  .org-tree-node-label {
    display: table-cell;
    vertical-align: middle;
  }

  &.collapsable .org-tree-node.collapsed {
    padding-right: 30px;

    .org-tree-node-label:after {
      top: 0;
      left: 100%;
      width: 20px;
      height: 50%;
      border-right: 0;
      border-bottom: 1px solid #ddd;
    }
  }

  &.collapsable .org-tree-node.collapsed-not-child {
    .org-tree-node-label:after {
      border-bottom: 0px !important;
    }
  }

  .org-tree-node-btn {
    top: 50%;
    left: 100%;
    margin-top: -11px;
    margin-left: 9px;
  }

  & > .org-tree-node:only-child:before {
    border-bottom: 0;
  }

  .org-tree-node-children {
    // display: flex;
    // flex-direction: column;
    // justify-content: center;
    // align-items: flex-start;
    display: table-cell;
    padding-top: 0;
    padding-left: 20px;

    &:before {
      top: 50%;
      left: 0;
      width: 20px;
      height: 0;
      border-left: 0;
      border-top: 1px solid #ddd;
    }

    &:after {
      display: none;
    }

    & > .org-tree-node {
      display: block;
    }
  }
}
</style>
