<!--
 * @Description: 中间表单布局面板
 * https://github.com/SortableJS/vue.draggable.next/issues/138
-->
<script lang="ts" setup>
import draggable from 'vuedraggable'
import { computed } from 'vue'
import { cloneDeep } from 'lodash-es'
import { Empty, Form } from 'ant-design-vue'
import { useFormDesignState } from '../../../hooks/useFormDesignState'
import LayoutItem from '../components/LayoutItem.vue'

const emit = defineEmits(['handleSetSelectItem'])

const Draggable = draggable

const { formConfig } = useFormDesignState()

/**
 * 拖拽完成事件
 */
function addItem({ newIndex }: any) {
  formConfig.value.schemas = formConfig.value.schemas || []

  const schemas = formConfig.value.schemas
  schemas[newIndex] = cloneDeep(schemas[newIndex])
  emit('handleSetSelectItem', schemas[newIndex])
}

/**
 * 拖拽开始事件
 * @param e {Object} 事件对象
 */
function handleDragStart(e: any) {
  emit('handleSetSelectItem', formConfig.value.schemas[e.oldIndex])
}

// 获取祖先组件传递的currentItem

// 计算布局元素，水平模式下为ACol，非水平模式下为div
const layoutTag = computed(() => {
  return formConfig.value.layout === 'horizontal' ? 'Col' : 'div'
})
</script>

<template>
  <div class="v-form-container form-panel">
    <Empty v-show="formConfig.schemas.length === 0" class="empty-text" description="从左侧选择控件添加" />
    <Form v-bind="formConfig">
      <div class="draggable-box">
        <Draggable
          v-model="formConfig.schemas" class="list-main ant-row" group="form-draggable"
          :component-data="{ name: 'list', tag: 'div', type: 'transition-group' }" ghost-class="moving" :animation="180"
          handle=".drag-move" item-key="key" @add="addItem" @start="handleDragStart"
        >
          <template #item="{ element }">
            <LayoutItem
              class="drag-move" :schema="element" :data="formConfig"
              :current-item="formConfig.currentItem || {}"
            />
          </template>
        </Draggable>
      </div>
    </Form>
  </div>
</template>

<style lang="less" scoped>
@import url('../styles/variable.less');
@import url('../styles/drag.less');

.v-form-container {

  // 内联布局样式
  .ant-form-inline {
    .list-main {
      display: flex;
      flex-wrap: wrap;
      place-content: flex-start flex-start;

      .layout-width {
        width: 100%;
      }
    }

    .ant-form-item-control-wrapper {
      min-width: 175px !important;
    }
  }
}

.form-panel {
  position: relative;
  height: 100%;

  .empty-text {
    position: absolute;
    inset: -10% 0 0;
    z-index: 100;
    height: 150px;
    margin: auto;
    color: #aaa;
  }

  .draggable-box {
    height: calc(100vh - 200px);
    // width: 100%;
    overflow: auto;

    .drag-move {
      min-height: 62px;
      cursor: move;
    }

    .list-main {

      // 列表动画
      .list-enter-active {
        transition: all 0.5s;
      }

      .list-leave-active {
        transition: all 0.3s;
      }

      .list-enter,
      .list-leave-to {
        opacity: 0;
        transform: translateX(-100px);
      }

      .list-enter {
        height: 30px;
      }
    }
  }
}
</style>
