<template>
  <div class="container">
    <div class="left-board">
      <div class="logo-wrapper">
        <div class="logo"> Form Generator</div>
      </div>
      <el-scrollbar class="left-scrollbar">
        <div class="components-list">
          <div v-for="(item, listIndex) in leftComponents" :key="listIndex">
            <div class="components-title">
              <zy-svg-icon icon-class="component"/>
              {{ item.title }}
            </div>
            <draggable class="components-draggable" :list="item.list" :group="{ name: 'componentsGroup', pull: 'clone', put: false }"
                       :clone="cloneComponent" draggable=".components-item" :sort="false" @end="onEnd">
              <div v-for="(element, index) in item.list" :key="index" class="components-item" @click="addComponent(element)">
                <div class="components-body">
                  <zy-svg-icon :icon-class="element.__config__.tagIcon"/>
                  {{ element.__config__.label }}
                </div>
              </div>
            </draggable>
          </div>
        </div>
      </el-scrollbar>
    </div>
    <div class="center-board">
      <div class="action-bar">
        <el-button type="primary" @click="preview">
          预览
        </el-button>
        <el-button type="primary" @click="save">
          保存
        </el-button>
      </div>
      <el-scrollbar class="center-scrollbar" :view-style="{height: '100%'}">
        <el-row class="center-board-row" :gutter="formConf.gutter">
          <el-form :size="formConf.size" :label-position="formConf.labelPosition" :disabled="formConf.disabled" :label-width="formConf.labelWidth + 'px'">
            <draggable class="drawing-board" :list="drawingList" :animation="340" group="componentsGroup">
              <draggable-item v-for="(item, index) in drawingList" :key="item.renderKey" :drawing-list="drawingList" :current-item="item"
                              :index="index" :active-id="activeId" :form-conf="formConf" @activeItem="activeFormItem"
                              @copyItem="drawingItemCopy" @deleteItem="drawingItemDelete"/>
            </draggable>
            <div v-show="!drawingList.length" class="empty-info">
              从左侧拖入或点选组件进行表单设计
            </div>
          </el-form>
        </el-row>
      </el-scrollbar>
    </div>
    <right-panel :active-data="activeData" :form-conf="formConf" :show-field="!!drawingList.length" @tag-change="tagChange"
                 @fetch-data="fetchData"/>
    <input id="copyNode" type="hidden">
    <form-drawer :show.sync="drawerVisible" :form-config="formConf" :filters="drawingList"></form-drawer>
  </div>
</template>

<script>
  import Draggable from 'vuedraggable'
  import FormDrawer from './form-drawer'
  import drawingDefault from '../assets/drawingDefault'
  import {getDrawingList, saveDrawingList, getIdGlobal, saveIdGlobal, getFormConf} from '../assets/storage'
  import {debounce} from 'throttle-debounce'
  import {inputComponents, selectComponents, layoutComponents, formConf} from '../assets/config'
  import {titleCase, deepClone, isObjectObject} from '../assets/utils'
  import DraggableItem from './draggable-item'
  import RightPanel from "./right-panel";

  let oldActiveId
  let tempActiveData
  const drawingListInDB = getDrawingList()
  const formConfInDB = getFormConf()
  const idGlobal = getIdGlobal()
  export default {
    name: 'ZyFormDesigner',
    components: {Draggable, DraggableItem, RightPanel, FormDrawer},
    data() {
      return {
        logo: require('../assets/logo.png'),
        idGlobal,
        formConf,
        inputComponents,
        selectComponents,
        layoutComponents,
        labelWidth: 100,
        drawingList: drawingDefault,
        drawingData: {},
        activeId: drawingDefault[0].formId,
        drawerVisible: false,
        formData: {},
        dialogVisible: false,
        jsonDrawerVisible: false,
        generateConf: null,
        showFileName: false,
        activeData: drawingDefault[0],
        saveDrawingListDebounce: debounce(340, saveDrawingList),
        saveIdGlobalDebounce: debounce(340, saveIdGlobal),
        leftComponents: [
          {
            title: '输入型组件',
            list: inputComponents
          },
          {
            title: '选择型组件',
            list: selectComponents
          },
          {
            title: '布局型组件',
            list: layoutComponents
          }
        ]
      }
    },
    mounted() {
      if (Array.isArray(drawingListInDB) && drawingListInDB.length > 0) {
        this.drawingList = drawingListInDB
      } else {
        this.drawingList = drawingDefault
      }
      this.activeFormItem(this.drawingList[0])
      if (formConfInDB) {
        this.formConf = formConfInDB
      }
    },
    watch: {
      // eslint-disable-next-line func-names
      'activeData.__config__.label': function (val, oldVal) {
        if (
            this.activeData.placeholder === undefined
            || !this.activeData.__config__.tag
            || oldActiveId !== this.activeId
        ) {
          return
        }
        this.activeData.placeholder = this.activeData.placeholder.replace(oldVal, '') + val
      },
      activeId: {
        handler(val) {
          oldActiveId = val
        },
        immediate: true
      },
      drawingList: {
        handler(val) {
          console.log(val)
          this.saveDrawingListDebounce(val)
          if (val.length === 0) this.idGlobal = 100
        },
        deep: true
      },
      idGlobal: {
        handler(val) {
          this.saveIdGlobalDebounce(val)
        },
        immediate: true
      }
    },
    methods: {
      setObjectValueReduce(obj, strKeys, data) {
        const arr = strKeys.split('.')
        arr.reduce((pre, item, i) => {
          if (arr.length === i + 1) {
            pre[item] = data
          } else if (!isObjectObject(pre[item])) {
            pre[item] = {}
          }
          return pre[item]
        }, obj)
      },
      setRespData(component, resp) {
        const {dataPath, renderKey, dataConsumer} = component.__config__
        if (!dataPath || !dataConsumer) return
        const respData = dataPath.split('.').reduce((pre, item) => pre[item], resp)
        // 将请求回来的数据，赋值到指定属性。
        // 以el-tabel为例，根据Element文档，应该将数据赋值给el-tabel的data属性，所以dataConsumer的值应为'data';
        // 此时赋值代码可写成 component[dataConsumer] = respData；
        // 但为支持更深层级的赋值（如：dataConsumer的值为'options.data'）,使用setObjectValueReduce
        this.setObjectValueReduce(component, dataConsumer, respData)
        const i = this.drawingList.findIndex(item => item.__config__.renderKey === renderKey)
        if (i > -1) this.$set(this.drawingList, i, component)
      },
      fetchData(component) {
        const {dataType, method, url} = component.__config__
        if (dataType === 'dynamic' && method && url) {
          this.setLoading(component, true)
          this.$axios({
            method,
            url
          }).then(resp => {
            this.setLoading(component, false)
            this.setRespData(component, resp.data)
          })
        }
      },
      setLoading(component, val) {
        const {directives} = component
        if (Array.isArray(directives)) {
          const t = directives.find(d => d.name === 'loading')
          if (t) t.value = val
        }
      },
      activeFormItem(currentItem) {
        this.activeData = currentItem
        this.activeId = currentItem.__config__.formId
      },
      onEnd(obj) {
        if (obj.from !== obj.to) {
          this.fetchData(tempActiveData)
          this.activeData = tempActiveData
          this.activeId = this.idGlobal
        }
      },
      addComponent(item) {
        const clone = this.cloneComponent(item)
        this.fetchData(clone)
        this.drawingList.push(clone)
        this.activeFormItem(clone)
      },
      cloneComponent(origin) {
        const clone = deepClone(origin)
        const config = clone.__config__
        config.span = this.formConf.span // 生成代码时，会根据span做精简判断
        this.createIdAndKey(clone)
        clone.placeholder !== undefined && (clone.placeholder += config.label)
        tempActiveData = clone
        return tempActiveData
      },
      createIdAndKey(item) {
        const config = item.__config__
        config.formId = ++this.idGlobal
        config.renderKey = `${config.formId}${+new Date()}` // 改变renderKey后可以实现强制更新组件
        if (config.layout === 'colFormItem') {
          item.__vModel__ = `field${this.idGlobal}`
        } else if (config.layout === 'rowFormItem') {
          config.componentName = `row${this.idGlobal}`
          !Array.isArray(config.children) && (config.children = [])
          delete config.label // rowFormItem无需配置label属性
        }
        if (Array.isArray(config.children)) {
          config.children = config.children.map(childItem => this.createIdAndKey(childItem))
        }
        return item
      },
      generate(data) {
        const func = this[`exec${titleCase(this.operationType)}`]
        this.generateConf = data
        func && func(data)
      },
      empty() {
        this.$confirm('确定要清空所有组件吗？', '提示', {type: 'warning'}).then(
            () => {
              this.drawingList = []
              this.idGlobal = 100
            }
        )
      },
      drawingItemCopy(item, list) {
        let clone = deepClone(item)
        clone = this.createIdAndKey(clone)
        list.push(clone)
        this.activeFormItem(clone)
      },
      drawingItemDelete(index, list) {
        list.splice(index, 1)
        this.$nextTick(() => {
          const len = this.drawingList.length
          if (len) {
            this.activeFormItem(this.drawingList[len - 1])
          }
        })
      },
      download() {
        this.dialogVisible = true
        this.showFileName = true
        this.operationType = 'download'
      },
      assembleFormData() {
        this.formData = {
          filters: deepClone(this.drawingList),
          ...this.formConf
        }
      },
      preview() {
        this.drawerVisible = true;
      },
      save() {
      },
      tagChange(newTag) {
        newTag = this.cloneComponent(newTag)
        const config = newTag.__config__
        newTag.__vModel__ = this.activeData.__vModel__
        config.formId = this.activeId
        config.span = this.activeData.__config__.span
        this.activeData.__config__.tag = config.tag
        this.activeData.__config__.tagIcon = config.tagIcon
        this.activeData.__config__.document = config.document
        if (typeof this.activeData.__config__.defaultValue === typeof config.defaultValue) {
          config.defaultValue = this.activeData.__config__.defaultValue
        }
        Object.keys(newTag).forEach(key => {
          if (this.activeData[key] !== undefined) {
            newTag[key] = this.activeData[key]
          }
        })
        this.activeData = newTag
        this.updateDrawingList(newTag, this.drawingList)
      },
      updateDrawingList(newTag, list) {
        const index = list.findIndex(item => item.__config__.formId === this.activeId)
        if (index > -1) {
          list.splice(index, 1, newTag)
        } else {
          list.forEach(item => {
            if (Array.isArray(item.__config__.children)) this.updateDrawingList(newTag, item.__config__.children)
          })
        }
      },
    }
  }
</script>

<style lang="scss">
  @import "../assets/styles/home.scss";
  @import '../assets/styles/index.scss';

  #app {
    font-family: Avenir, Helvetica, Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    color: #2c3e50;
    padding: 10px 16px;
  }

</style>
