import { h, ref, reactive, nextTick, inject, watch, provide, onMounted, onUnmounted } from 'vue'
import { defineVxeComponent } from '../../ui/src/comp'
import { setScrollTop, setScrollLeft, removeClass, addClass } from '../../ui/src/dom'
import { VxeUI } from '@vxe-ui/core'
import { getRefElem } from './util'
import XEUtils from 'xe-utils'
import GanttViewHeaderComponent from './gantt-header'
import GanttViewBodyComponent from './gantt-body'
import GanttViewFooterComponent from './gantt-footer'

import type { VxeGanttViewConstructor, GanttViewReactData, GanttViewPrivateRef, VxeGanttDefines, VxeGanttViewPrivateMethods, GanttViewInternalData, VxeGanttViewMethods, GanttViewPrivateComputed, VxeGanttConstructor, VxeGanttPrivateMethods } from '../../../types'

const { globalEvents } = VxeUI

function createInternalData (): GanttViewInternalData {
  return {
    xeTable: null,
    startMaps: {},
    endMaps: {},
    chartMaps: {},
    elemStore: {},
    // 存放横向 X 虚拟滚动相关的信息
    scrollXStore: {
      preloadSize: 0,
      offsetSize: 0,
      visibleSize: 0,
      visibleStartIndex: 0,
      visibleEndIndex: 0,
      startIndex: 0,
      endIndex: 0
    },
    // 存放纵向 Y 虚拟滚动相关信息
    scrollYStore: {
      preloadSize: 0,
      offsetSize: 0,
      visibleSize: 0,
      visibleStartIndex: 0,
      visibleEndIndex: 0,
      startIndex: 0,
      endIndex: 0
    }
  }
}

const maxYHeight = 5e6
// const maxXWidth = 5e6

export default defineVxeComponent({
  name: 'VxeGanttView',
  setup (props, context) {
    const xID = XEUtils.uniqueId()

    const $xeGantt = inject('$xeGantt', {} as (VxeGanttConstructor & VxeGanttPrivateMethods))

    const { computeTaskOpts, computeStartField, computeEndField, computeScrollbarOpts, computeScrollbarXToTop, computeScrollbarYToLeft } = $xeGantt.getComputeMaps()

    const refElem = ref<HTMLDivElement>()

    const refScrollXVirtualElem = ref<HTMLDivElement>()
    const refScrollYVirtualElem = ref<HTMLDivElement>()
    const refScrollXHandleElem = ref<HTMLDivElement>()
    const refScrollXLeftCornerElem = ref<HTMLDivElement>()
    const refScrollXRightCornerElem = ref<HTMLDivElement>()
    const refScrollYHandleElem = ref<HTMLDivElement>()
    const refScrollYTopCornerElem = ref<HTMLDivElement>()
    const refScrollXWrapperElem = ref<HTMLDivElement>()
    const refScrollYWrapperElem = ref<HTMLDivElement>()
    const refScrollYBottomCornerElem = ref<HTMLDivElement>()
    const refScrollXSpaceElem = ref<HTMLDivElement>()
    const refScrollYSpaceElem = ref<HTMLDivElement>()

    const refColInfoElem = ref<HTMLDivElement>()

    const reactData = reactive<GanttViewReactData>({
      // 是否启用了横向 X 可视渲染方式加载
      scrollXLoad: false,
      // 是否启用了纵向 Y 可视渲染方式加载
      scrollYLoad: false,
      // 是否存在纵向滚动条
      overflowY: true,
      // 是否存在横向滚动条
      overflowX: true,
      // 纵向滚动条的宽度
      scrollbarWidth: 0,
      // 横向滚动条的高度
      scrollbarHeight: 0,

      lazScrollLoading: false,

      scrollVMLoading: false,
      scrollYHeight: 0,
      scrollYTop: 0,
      isScrollYBig: false,
      scrollXLeft: 0,
      scrollXWidth: 0,
      isScrollXBig: false,

      minViewDate: null,
      maxViewDate: null,
      tableData: [],
      tableColumn: [],
      headerGroups: [],

      viewCellWidth: 20
    })

    const internalData = createInternalData()

    const refMaps: GanttViewPrivateRef = {
      refElem
    }

    const computeMaps: GanttViewPrivateComputed = {
    }

    const $xeGanttView = {
      xID,
      props,
      context,
      reactData,
      internalData,

      getRefMaps: () => refMaps,
      getComputeMaps: () => computeMaps
    } as unknown as VxeGanttViewConstructor & VxeGanttViewPrivateMethods

    const parseStringDate = (dateValue: any) => {
      const taskOpts = computeTaskOpts.value
      const { dateFormat } = taskOpts
      return XEUtils.toStringDate(dateValue, dateFormat || null)
    }

    const handleParseColumn = () => {
      const ganttProps = $xeGantt.props
      const ganttReactData = $xeGantt.reactData
      const { treeConfig } = ganttProps
      const { taskScaleList } = ganttReactData
      const { minViewDate, maxViewDate } = reactData
      const minScale = XEUtils.last(taskScaleList)
      const fullCols: VxeGanttDefines.ViewColumn[] = []
      const groupCols: VxeGanttDefines.HeaderColumn[] = []
      if (minScale && minViewDate && maxViewDate) {
        const minSType = minScale.type
        const weekScale = taskScaleList.find(item => item.type === 'week')
        let gapTime = 1000 * 60 * 60 * 24
        switch (minScale.type) {
          case 'hour':
            gapTime = 1000 * 60 * 60
            break
          case 'minute':
            gapTime = 1000 * 60
            break
          case 'second':
            gapTime = 1000
            break
          default: {
            break
          }
        }
        const currTime = minViewDate.getTime()
        const diffDayNum = maxViewDate.getTime() - minViewDate.getTime()
        const countSize = Math.max(5, Math.floor(diffDayNum / gapTime) + 1)

        switch (minScale.type) {
          case 'day':
          case 'date':
            if (diffDayNum > (1000 * 60 * 60 * 24 * 366 * 3)) {
              reactData.tableColumn = []
              reactData.headerGroups = []
              return
            }
            break
          case 'hour':
            if (diffDayNum > (1000 * 60 * 60 * 24 * 31 * 3)) {
              reactData.tableColumn = []
              reactData.headerGroups = []
              return
            }
            break
          case 'minute':
            if (diffDayNum > (1000 * 60 * 60 * 24 * 3)) {
              reactData.tableColumn = []
              reactData.headerGroups = []
              return
            }
            break
          case 'second':
            if (diffDayNum > (1000 * 60 * 60 * 3)) {
              reactData.tableColumn = []
              reactData.headerGroups = []
              return
            }
            break
        }

        const renderListMaps: Record<VxeGanttDefines.ColumnScaleType, VxeGanttDefines.ViewColumn[]> = {
          year: [],
          quarter: [],
          month: [],
          week: [],
          day: [],
          date: [],
          hour: [],
          minute: [],
          second: []
        }

        const tempTypeMaps: Record<VxeGanttDefines.ColumnScaleType, Record<string, VxeGanttDefines.ViewColumn>> = {
          year: {},
          quarter: {},
          month: {},
          week: {},
          day: {},
          date: {},
          hour: {},
          minute: {},
          second: {}
        }

        const handleData = (type: VxeGanttDefines.ColumnScaleType, colMaps: Record<VxeGanttDefines.ColumnScaleType, VxeGanttDefines.ViewColumn>, minCol: VxeGanttDefines.ViewColumn) => {
          if (minSType === type) {
            return
          }
          const currCol = colMaps[type]
          const currKey = `${currCol.field}`
          let currGpCol = tempTypeMaps[type][currKey]
          if (!currGpCol) {
            currGpCol = currCol
            tempTypeMaps[type][currKey] = currGpCol
            renderListMaps[type].push(currGpCol)
          }
          if (currGpCol) {
            if (!currGpCol.children) {
              currGpCol.children = []
            }
            currGpCol.children.push(minCol)
          }
        }
        for (let i = 0; i < countSize; i++) {
          const itemDate = new Date(currTime + (i * gapTime))
          const [yyyy, MM, dd, HH, mm, ss] = XEUtils.toDateString(itemDate, 'yyyy-M-d-H-m-s').split('-')
          const e = itemDate.getDay()
          const E = e + 1
          const q = Math.ceil((itemDate.getMonth() + 1) / 3)
          const W = XEUtils.getYearWeek(itemDate, weekScale ? weekScale.startDay : undefined)
          const dateObj: VxeGanttDefines.ScaleDateObj = { yy: yyyy, M: MM, d: dd, H: HH, m: mm, s: ss, q, W, E, e }
          const colMaps: Record<VxeGanttDefines.ColumnScaleType, VxeGanttDefines.ViewColumn> = {
            year: {
              field: yyyy,
              title: yyyy,
              params: dateObj
            },
            quarter: {
              field: `${yyyy}_q${q}`,
              title: q,
              params: dateObj
            },
            month: {
              field: `${yyyy}_${MM}`,
              title: MM,
              params: dateObj
            },
            week: {
              field: `${yyyy}_W${W}`,
              title: W,
              params: dateObj
            },
            day: {
              field: `${yyyy}_${MM}_${dd}_E${E}`,
              title: E,
              params: dateObj
            },
            date: {
              field: `${yyyy}_${MM}_${dd}`,
              title: dd,
              params: dateObj
            },
            hour: {
              field: `${yyyy}_${MM}_${dd}_${HH}`,
              title: HH,
              params: dateObj
            },
            minute: {
              field: `${yyyy}_${MM}_${dd}_${HH}_${mm}`,
              title: mm,
              params: dateObj
            },
            second: {
              field: `${yyyy}_${MM}_${dd}_${HH}_${mm}_${ss}`,
              title: ss,
              params: dateObj
            }
          }
          const minCol = colMaps[minSType]
          if (minScale.level < 19) {
            handleData('year', colMaps, minCol)
          }
          if (minScale.level < 17) {
            handleData('quarter', colMaps, minCol)
          }
          if (minScale.level < 14) {
            handleData('month', colMaps, minCol)
          }
          if (minScale.level < 13) {
            handleData('week', colMaps, minCol)
          }
          if (minScale.level < 11) {
            handleData('day', colMaps, minCol)
          }
          if (minScale.level < 12) {
            handleData('date', colMaps, minCol)
          }
          if (minScale.level < 7) {
            handleData('hour', colMaps, minCol)
          }
          if (minScale.level < 5) {
            handleData('minute', colMaps, minCol)
          }

          fullCols.push(minCol)
        }

        taskScaleList.forEach(scaleItem => {
          if (scaleItem.type === minSType) {
            groupCols.push({
              scaleItem,
              columns: fullCols
            })
            return
          }
          const list = renderListMaps[scaleItem.type] || []
          if (list) {
            list.forEach(item => {
              item.childCount = item.children ? item.children.length : 0
              item.children = undefined
            })
          }
          groupCols.push({
            scaleItem,
            columns: list
          })
        })

        const $xeTable = internalData.xeTable
        if ($xeTable) {
          const startField = computeStartField.value
          const endField = computeEndField.value
          const { computeTreeOpts } = $xeTable.getComputeMaps()
          const tableInternalData = $xeTable.internalData
          const { afterFullData, afterTreeFullData } = tableInternalData
          const treeOpts = computeTreeOpts.value
          const { transform } = treeOpts
          const childrenField = treeOpts.children || treeOpts.childrenField

          const ctMaps: Record<string, VxeGanttDefines.RowCacheItem> = {}
          const handleParseRender = (row: any) => {
            const rowid = $xeTable.getRowid(row)
            const startValue = XEUtils.get(row, startField)
            const endValue = XEUtils.get(row, endField)
            if (startValue && endValue) {
              const startDate = parseStringDate(startValue)
              const endDate = parseStringDate(endValue)
              const oLeftSize = Math.floor((startDate.getTime() - minViewDate.getTime()) / gapTime)
              const oWidthSize = Math.floor((endDate.getTime() - startDate.getTime()) / gapTime) + 1
              ctMaps[rowid] = {
                row,
                rowid,
                oLeftSize,
                oWidthSize
              }
            }
          }

          if (treeConfig) {
            XEUtils.eachTree(afterTreeFullData, handleParseRender, { children: transform ? treeOpts.mapChildrenField : childrenField })
          } else {
            afterFullData.forEach(handleParseRender)
          }
          internalData.chartMaps = ctMaps
        }
      }
      reactData.tableColumn = fullCols
      reactData.headerGroups = groupCols
    }

    const handleUpdateData = () => {
      const ganttProps = $xeGantt.props
      const { treeConfig } = ganttProps
      const $xeTable = internalData.xeTable
      const sdMaps: Record<string, any> = {}
      const edMaps: Record<string, any> = {}
      let minDate: Date | null = null
      let maxDate: Date | null = null
      if ($xeTable) {
        const startField = computeStartField.value
        const endField = computeEndField.value
        const { computeTreeOpts } = $xeTable.getComputeMaps()
        const tableInternalData = $xeTable.internalData
        const { afterFullData, afterTreeFullData } = tableInternalData
        const treeOpts = computeTreeOpts.value
        const { transform } = treeOpts
        const childrenField = treeOpts.children || treeOpts.childrenField

        const handleMinMaxData = (row: any) => {
          const startValue = XEUtils.get(row, startField)
          const endValue = XEUtils.get(row, endField)
          if (startValue && endValue) {
            const startDate = parseStringDate(startValue)
            if (!minDate || minDate.getTime() > startDate.getTime()) {
              minDate = startDate
            }
            const endDate = parseStringDate(endValue)
            if (!maxDate || maxDate.getTime() < endDate.getTime()) {
              maxDate = endDate
            }
          }
        }

        if (treeConfig) {
          XEUtils.eachTree(afterTreeFullData, handleMinMaxData, { children: transform ? treeOpts.mapChildrenField : childrenField })
        } else {
          afterFullData.forEach(handleMinMaxData)
        }
      }
      reactData.minViewDate = minDate
      reactData.maxViewDate = maxDate
      internalData.startMaps = sdMaps
      internalData.endMaps = edMaps
      handleParseColumn()
    }

    const calcScrollbar = () => {
      const { scrollXWidth, scrollYHeight } = reactData
      const { elemStore } = internalData
      const scrollbarOpts = computeScrollbarOpts.value
      const bodyWrapperElem = getRefElem(elemStore['main-body-wrapper'])
      const xHandleEl = refScrollXHandleElem.value
      const yHandleEl = refScrollYHandleElem.value
      let overflowY = false
      let overflowX = false
      if (bodyWrapperElem) {
        overflowY = scrollYHeight > bodyWrapperElem.clientHeight
        if (yHandleEl) {
          reactData.scrollbarWidth = scrollbarOpts.width || (yHandleEl.offsetWidth - yHandleEl.clientWidth) || 14
        }
        reactData.overflowY = overflowY

        overflowX = scrollXWidth > bodyWrapperElem.clientWidth
        if (xHandleEl) {
          reactData.scrollbarHeight = scrollbarOpts.height || (xHandleEl.offsetHeight - xHandleEl.clientHeight) || 14
        }

        reactData.overflowX = overflowX
      }
    }

    const updateChart = () => {
      const { viewCellWidth } = reactData
      const { elemStore, chartMaps } = internalData
      const chartWrapper = getRefElem(elemStore['main-chart-wrapper'])
      if (chartWrapper) {
        XEUtils.arrayEach(chartWrapper.children, (rowEl) => {
          const barEl = rowEl.children[0] as HTMLDivElement
          if (!barEl) {
            return
          }
          const rowid = rowEl.getAttribute('rowid')
          const rowRest = rowid ? chartMaps[rowid] : null
          if (rowRest) {
            barEl.style.left = `${viewCellWidth * rowRest.oLeftSize}px`
            barEl.style.width = `${viewCellWidth * rowRest.oWidthSize}px`
          }
        })
      }
      return nextTick()
    }

    const updateStyle = () => {
      const { scrollbarWidth, scrollbarHeight, tableColumn, headerGroups } = reactData
      const { elemStore } = internalData
      const $xeTable = internalData.xeTable

      const el = refElem.value
      if (!el || !el.clientHeight) {
        return
      }

      const scrollbarOpts = computeScrollbarOpts.value
      const scrollbarXToTop = computeScrollbarXToTop.value
      const scrollbarYToLeft = computeScrollbarYToLeft.value

      const xLeftCornerEl = refScrollXLeftCornerElem.value
      const xRightCornerEl = refScrollXRightCornerElem.value
      const scrollXVirtualEl = refScrollXVirtualElem.value

      let osbWidth = scrollbarWidth
      const osbHeight = scrollbarHeight

      let tbHeight = 0
      let tHeaderHeight = 0
      let tFooterHeight = 0
      if ($xeTable) {
        const tableInternalData = $xeTable.internalData
        tbHeight = tableInternalData.tBodyHeight
        tHeaderHeight = tableInternalData.tHeaderHeight
        tFooterHeight = tableInternalData.tFooterHeight
      }

      let yScrollbarVisible = 'visible'
      if (scrollbarYToLeft || (scrollbarOpts.y && scrollbarOpts.y.visible === false)) {
        osbWidth = 0
        yScrollbarVisible = 'hidden'
      }

      const headerScrollElem = getRefElem(elemStore['main-header-scroll'])
      if (headerScrollElem) {
        headerScrollElem.style.height = `${tHeaderHeight}px`
        headerScrollElem.style.setProperty('--vxe-ui-gantt-view-cell-height', `${tHeaderHeight / headerGroups.length}px`)
      }
      const bodyScrollElem = getRefElem(elemStore['main-body-scroll'])
      if (bodyScrollElem) {
        bodyScrollElem.style.height = `${tbHeight}px`
      }
      const footerScrollElem = getRefElem(elemStore['main-footer-scroll'])
      if (footerScrollElem) {
        footerScrollElem.style.height = `${tFooterHeight}px`
      }

      if (scrollXVirtualEl) {
        scrollXVirtualEl.style.height = `${osbHeight}px`
        scrollXVirtualEl.style.visibility = 'visible'
      }
      const xWrapperEl = refScrollXWrapperElem.value
      if (xWrapperEl) {
        xWrapperEl.style.left = scrollbarXToTop ? `${osbWidth}px` : ''
        xWrapperEl.style.width = `${el.clientWidth - osbWidth}px`
      }
      if (xLeftCornerEl) {
        xLeftCornerEl.style.width = scrollbarXToTop ? `${osbWidth}px` : ''
        xLeftCornerEl.style.display = scrollbarXToTop ? (osbHeight ? 'block' : '') : ''
      }
      if (xRightCornerEl) {
        xRightCornerEl.style.width = scrollbarXToTop ? '' : `${osbWidth}px`
        xRightCornerEl.style.display = scrollbarXToTop ? '' : (osbHeight ? 'block' : '')
      }

      const scrollYVirtualEl = refScrollYVirtualElem.value
      if (scrollYVirtualEl) {
        scrollYVirtualEl.style.width = `${osbWidth}px`
        scrollYVirtualEl.style.height = `${tbHeight + tHeaderHeight + tFooterHeight}px`
        scrollYVirtualEl.style.visibility = yScrollbarVisible
      }
      const yTopCornerEl = refScrollYTopCornerElem.value
      if (yTopCornerEl) {
        yTopCornerEl.style.height = `${tHeaderHeight}px`
        yTopCornerEl.style.display = tHeaderHeight ? 'block' : ''
      }
      const yWrapperEl = refScrollYWrapperElem.value
      if (yWrapperEl) {
        yWrapperEl.style.height = `${tbHeight}px`
        yWrapperEl.style.top = `${tHeaderHeight}px`
      }
      const yBottomCornerEl = refScrollYBottomCornerElem.value
      if (yBottomCornerEl) {
        yBottomCornerEl.style.height = `${tFooterHeight}px`
        yBottomCornerEl.style.top = `${tHeaderHeight + tbHeight}px`
        yBottomCornerEl.style.display = tFooterHeight ? 'block' : ''
      }

      const colInfoElem = refColInfoElem.value
      if (colInfoElem) {
        reactData.viewCellWidth = colInfoElem.clientWidth || 40
      }
      let viewTableWidth = reactData.viewCellWidth * tableColumn.length
      if (bodyScrollElem) {
        const viewWidth = bodyScrollElem.clientWidth
        const remainWidth = viewWidth - viewTableWidth
        if (remainWidth > 0) {
          reactData.viewCellWidth += Math.floor(remainWidth / tableColumn.length)
          viewTableWidth = viewWidth
        }
      }
      const headerTableElem = getRefElem(elemStore['main-header-table'])
      const bodyTableElem = getRefElem(elemStore['main-body-table'])
      if (headerTableElem) {
        headerTableElem.style.width = `${viewTableWidth}px`
      }
      if (bodyTableElem) {
        bodyTableElem.style.width = `${viewTableWidth}px`
      }

      reactData.scrollXWidth = viewTableWidth

      return updateChart()
    }

    const handleLazyRecalculate = () => {
      calcScrollbar()
      updateStyle()
      updateChart()
      return nextTick()
    }

    // const updateScrollXSpace = () => {

    // }

    const updateScrollYSpace = () => {
      const { elemStore } = internalData
      const $xeTable = internalData.xeTable
      const bodyScrollElem = getRefElem(elemStore['main-body-scroll'])
      const bodyTableElem = getRefElem(elemStore['main-body-table'])

      let ySpaceTop = 0
      let scrollYHeight = 0
      let isScrollYBig = false
      if ($xeTable) {
        const tableReactData = $xeTable.reactData
        ySpaceTop = tableReactData.scrollYTop
        scrollYHeight = tableReactData.scrollYHeight
        isScrollYBig = tableReactData.isScrollYBig
      }

      let ySpaceHeight = scrollYHeight
      let scrollYTop = ySpaceTop

      let clientHeight = 0
      if (bodyScrollElem) {
        clientHeight = bodyScrollElem.clientHeight
      }
      if (isScrollYBig) {
        // 触底
        if (bodyScrollElem && bodyTableElem && bodyScrollElem.scrollTop + clientHeight >= maxYHeight) {
          scrollYTop = maxYHeight - bodyTableElem.clientHeight
        } else {
          scrollYTop = (maxYHeight - clientHeight) * (ySpaceTop / (scrollYHeight - clientHeight))
        }
        ySpaceHeight = maxYHeight
      }

      const bodyChartWrapperElem = getRefElem(elemStore['main-chart-wrapper'])
      if (bodyTableElem) {
        bodyTableElem.style.transform = `translate(${reactData.scrollXLeft || 0}px, ${scrollYTop}px)`
      }
      if (bodyChartWrapperElem) {
        bodyChartWrapperElem.style.transform = `translate(${reactData.scrollXLeft || 0}px, ${scrollYTop}px)`
      }

      const bodyYSpaceElem = getRefElem(elemStore['main-body-ySpace'])
      if (bodyYSpaceElem) {
        bodyYSpaceElem.style.height = ySpaceHeight ? `${ySpaceHeight}px` : ''
      }

      const scrollYSpaceEl = refScrollYSpaceElem.value
      if (scrollYSpaceEl) {
        scrollYSpaceEl.style.height = ySpaceHeight ? `${ySpaceHeight}px` : ''
      }
      reactData.scrollYTop = scrollYTop
      reactData.scrollYHeight = scrollYHeight
      reactData.isScrollYBig = isScrollYBig

      calcScrollbar()
      return nextTick().then(() => {
        updateStyle()
      })
    }

    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    const checkLastSyncScroll = (isRollX: boolean, isRollY: boolean) => {
      const { lcsTimeout } = internalData
      reactData.lazScrollLoading = true
      if (lcsTimeout) {
        clearTimeout(lcsTimeout)
      }
      internalData.lcsTimeout = setTimeout(() => {
        internalData.lcsRunTime = Date.now()
        internalData.lcsTimeout = undefined
        internalData.intoRunScroll = false
        internalData.inVirtualScroll = false
        internalData.inWheelScroll = false
        internalData.inHeaderScroll = false
        internalData.inBodyScroll = false
        internalData.inFooterScroll = false
        reactData.lazScrollLoading = false
      }, 200)
    }

    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    const handleScrollEvent = (evnt: Event, isRollY: boolean, isRollX: boolean, scrollTop: number, scrollLeft: number) => {
      checkLastSyncScroll(isRollX, isRollY)
    }

    const ganttViewMethods: VxeGanttViewMethods = {
      refreshData () {
        handleUpdateData()
        return handleLazyRecalculate()
      },
      updateViewData () {
        const $xeTable = internalData.xeTable
        if ($xeTable) {
          const tableReactData = $xeTable.reactData
          const { tableData } = tableReactData
          reactData.tableData = tableData
        }
        return nextTick()
      },
      connectUpdate ({ $table }) {
        if ($table) {
          internalData.xeTable = $table
        }
        return nextTick()
      }
    }

    /**
     * 同步表格滚动
     */
    const syncTableScrollTop = (scrollTop: number) => {
      const $xeTable = internalData.xeTable
      if ($xeTable) {
        const tableInternalData = $xeTable.internalData
        const { elemStore: tableElemStore } = tableInternalData
        const tableBodyScrollElem = getRefElem(tableElemStore['main-body-scroll'])
        if (tableBodyScrollElem) {
          tableBodyScrollElem.scrollTop = scrollTop
        }
      }
    }

    const ganttViewPrivateMethods: VxeGanttViewPrivateMethods = {
      handleUpdateStyle: updateStyle,
      handleLazyRecalculate,
      handleUpdateCurrentRow (row) {
        const $xeTable = internalData.xeTable
        const el = refElem.value
        if ($xeTable && el) {
          if (row) {
            const tableProps = $xeTable.props
            const { highlightCurrentRow } = tableProps
            const { computeRowOpts } = $xeTable.getComputeMaps()
            const rowOpts = computeRowOpts.value
            if (rowOpts.isCurrent || highlightCurrentRow) {
              XEUtils.arrayEach(el.querySelectorAll(`.vxe-gantt-view--body-row[rowid="${$xeTable.getRowid(row)}"]`), elem => addClass(elem, 'row--current'))
            }
          } else {
            XEUtils.arrayEach(el.querySelectorAll('.vxe-gantt-view--body-row.row--current'), elem => removeClass(elem, 'row--current'))
          }
        }
      },
      handleUpdateHoverRow (row) {
        const $xeTable = internalData.xeTable
        const el = refElem.value
        if ($xeTable && el) {
          if (row) {
            XEUtils.arrayEach(el.querySelectorAll(`.vxe-gantt-view--body-row[rowid="${$xeTable.getRowid(row)}"]`), elem => addClass(elem, 'row--hover'))
          } else {
            XEUtils.arrayEach(el.querySelectorAll('.vxe-gantt-view--body-row.row--hover'), elem => removeClass(elem, 'row--hover'))
          }
        }
      },
      triggerHeaderScrollEvent (evnt) {
        const { elemStore, inVirtualScroll, inBodyScroll, inFooterScroll } = internalData
        if (inVirtualScroll) {
          return
        }
        if (inBodyScroll || inFooterScroll) {
          return
        }
        const wrapperEl = evnt.currentTarget as HTMLDivElement
        const bodyScrollElem = getRefElem(elemStore['main-body-scroll'])
        const xHandleEl = refScrollXHandleElem.value
        if (bodyScrollElem && wrapperEl) {
          const isRollX = true
          const isRollY = false
          const currLeftNum = wrapperEl.scrollLeft
          internalData.inHeaderScroll = true
          setScrollLeft(xHandleEl, currLeftNum)
          setScrollLeft(bodyScrollElem, currLeftNum)
          handleScrollEvent(evnt, isRollY, isRollX, wrapperEl.scrollTop, currLeftNum)
        }
      },
      triggerBodyScrollEvent (evnt) {
        const { elemStore, inVirtualScroll, inHeaderScroll, inFooterScroll } = internalData
        if (inVirtualScroll) {
          return
        }
        if (inHeaderScroll || inFooterScroll) {
          return
        }
        const wrapperEl = evnt.currentTarget as HTMLDivElement
        const headerScrollElem = getRefElem(elemStore['main-header-scroll'])
        const xHandleEl = refScrollXHandleElem.value
        const yHandleEl = refScrollYHandleElem.value
        if (headerScrollElem && wrapperEl) {
          const isRollX = true
          const isRollY = true
          const currLeftNum = wrapperEl.scrollLeft
          const currTopNum = wrapperEl.scrollTop
          internalData.inBodyScroll = true
          setScrollLeft(xHandleEl, currLeftNum)
          setScrollLeft(headerScrollElem, currLeftNum)
          setScrollTop(yHandleEl, currTopNum)
          syncTableScrollTop(currTopNum)
          handleScrollEvent(evnt, isRollY, isRollX, wrapperEl.scrollTop, currLeftNum)
        }
      },
      triggerFooterScrollEvent (evnt) {
        const { inVirtualScroll, inHeaderScroll, inBodyScroll } = internalData
        if (inVirtualScroll) {
          return
        }
        if (inHeaderScroll || inBodyScroll) {
          return
        }
        const wrapperEl = evnt.currentTarget as HTMLDivElement
        if (wrapperEl) {
          const isRollX = true
          const isRollY = false
          const currLeftNum = wrapperEl.scrollLeft
          handleScrollEvent(evnt, isRollY, isRollX, wrapperEl.scrollTop, currLeftNum)
        }
      },
      triggerVirtualScrollXEvent (evnt) {
        const { elemStore, inHeaderScroll, inBodyScroll } = internalData
        if (inHeaderScroll || inBodyScroll) {
          return
        }
        const wrapperEl = evnt.currentTarget as HTMLDivElement
        const headerScrollElem = getRefElem(elemStore['main-header-scroll'])
        const bodyScrollElem = getRefElem(elemStore['main-body-scroll'])
        if (wrapperEl) {
          const isRollY = false
          const isRollX = true
          const currLeftNum = wrapperEl.scrollLeft
          internalData.inVirtualScroll = true
          setScrollLeft(headerScrollElem, currLeftNum)
          setScrollLeft(bodyScrollElem, currLeftNum)
          handleScrollEvent(evnt, isRollY, isRollX, wrapperEl.scrollTop, currLeftNum)
        }
      },
      triggerVirtualScrollYEvent (evnt) {
        const { elemStore, inHeaderScroll, inBodyScroll } = internalData
        if (inHeaderScroll || inBodyScroll) {
          return
        }
        const wrapperEl = evnt.currentTarget as HTMLDivElement
        const bodyScrollElem = getRefElem(elemStore['main-body-scroll'])
        if (wrapperEl) {
          const isRollY = true
          const isRollX = false
          const currTopNum = wrapperEl.scrollTop
          internalData.inVirtualScroll = true
          setScrollTop(bodyScrollElem, currTopNum)
          syncTableScrollTop(currTopNum)
          handleScrollEvent(evnt, isRollY, isRollX, currTopNum, wrapperEl.scrollLeft)
        }
      },
      handleUpdateSXSpace () {
        const { scrollXLoad, scrollXWidth } = reactData
        const { elemStore } = internalData

        const layoutList = ['header', 'body', 'footer']
        layoutList.forEach(layout => {
          const xSpaceElem = getRefElem(elemStore[`main-${layout}-xSpace`])
          if (xSpaceElem) {
            xSpaceElem.style.width = scrollXLoad ? `${scrollXWidth}px` : ''
          }
        })

        const scrollXSpaceEl = refScrollXSpaceElem.value
        if (scrollXSpaceEl) {
          scrollXSpaceEl.style.width = `${scrollXWidth}px`
        }

        calcScrollbar()
        return nextTick()
      },
      handleUpdateSYSpace: updateScrollYSpace,
      handleUpdateSYStatus (sYLoad) {
        reactData.scrollYLoad = sYLoad
      }
    }

    const handleGlobalResizeEvent = () => {
      handleLazyRecalculate()
    }

    Object.assign($xeGanttView, ganttViewMethods, ganttViewPrivateMethods)

    const renderScrollX = () => {
      return h('div', {
        key: 'vsx',
        ref: refScrollXVirtualElem,
        class: 'vxe-gantt-view--scroll-x-virtual'
      }, [
        h('div', {
          ref: refScrollXLeftCornerElem,
          class: 'vxe-gantt-view--scroll-x-left-corner'
        }),
        h('div', {
          ref: refScrollXWrapperElem,
          class: 'vxe-gantt-view--scroll-x-wrapper'
        }, [
          h('div', {
            ref: refScrollXHandleElem,
            class: 'vxe-gantt-view--scroll-x-handle',
            onScroll: $xeGanttView.triggerVirtualScrollXEvent
          }, [
            h('div', {
              ref: refScrollXSpaceElem,
              class: 'vxe-gantt-view--scroll-x-space'
            })
          ])
        ]),
        h('div', {
          ref: refScrollXRightCornerElem,
          class: 'vxe-gantt-view--scroll-x-right-corner'
        })
      ])
    }

    const renderScrollY = () => {
      return h('div', {
        ref: refScrollYVirtualElem,
        class: 'vxe-gantt-view--scroll-y-virtual'
      }, [
        h('div', {
          ref: refScrollYTopCornerElem,
          class: 'vxe-gantt-view--scroll-y-top-corner'
        }),
        h('div', {
          ref: refScrollYWrapperElem,
          class: 'vxe-gantt-view--scroll-y-wrapper'
        }, [
          h('div', {
            ref: refScrollYHandleElem,
            class: 'vxe-gantt-view--scroll-y-handle',
            onScroll: $xeGanttView.triggerVirtualScrollYEvent
          }, [
            h('div', {
              ref: refScrollYSpaceElem,
              class: 'vxe-gantt-view--scroll-y-space'
            })
          ])
        ]),
        h('div', {
          ref: refScrollYBottomCornerElem,
          class: 'vxe-gantt-view--scroll-y-bottom-corner'
        })
      ])
    }

    const renderViewport = () => {
      return h('div', {
        class: 'vxe-gantt-view--viewport-wrapper'
      }, [
        h(GanttViewHeaderComponent),
        h(GanttViewBodyComponent),
        h(GanttViewFooterComponent)
      ])
    }

    const renderBody = () => {
      const scrollbarYToLeft = computeScrollbarYToLeft.value
      return h('div', {
        class: 'vxe-gantt-view--layout-wrapper'
      }, scrollbarYToLeft
        ? [
            renderScrollY(),
            renderViewport()
          ]
        : [
            renderViewport(),
            renderScrollY()
          ])
    }

    const renderVN = () => {
      const { overflowX, overflowY, scrollXLoad, scrollYLoad } = reactData
      const scrollbarXToTop = computeScrollbarXToTop.value
      return h('div', {
        ref: refElem,
        class: ['vxe-gantt-view', {
          'is--scroll-y': overflowY,
          'is--scroll-x': overflowX,
          'is--virtual-x': scrollXLoad,
          'is--virtual-y': scrollYLoad
        }]
      }, [
        h('div', {
          class: 'vxe-gantt-view--render-wrapper'
        }, scrollbarXToTop
          ? [
              renderScrollX(),
              renderBody()
            ]
          : [
              renderBody(),
              renderScrollX()
            ]),
        h('div', {
          class: 'vxe-gantt-view--render-vars'
        }, [
          h('div', {
            ref: refColInfoElem,
            class: 'vxe-gantt-view--column-info'
          })
        ])
      ])
    }

    const tdFlag = ref(0)
    watch(() => reactData.tableData, () => {
      tdFlag.value++
    })
    watch(() => reactData.tableData.length, () => {
      tdFlag.value++
    })
    watch(tdFlag, () => {
      handleUpdateData()
    })

    onMounted(() => {
      globalEvents.on($xeGanttView, 'resize', handleGlobalResizeEvent)
    })

    onUnmounted(() => {
      globalEvents.off($xeGanttView, 'keydown')
      XEUtils.assign(internalData, createInternalData())
    })

    $xeGanttView.renderVN = renderVN

    provide('$xeGanttView', $xeGanttView)

    return $xeGanttView
  },
  render () {
    return this.renderVN()
  }
})