import Container from '@/components/shared/Container'
import { DX_CLASSNAMES } from '@/constants/app.constant'
import { GridDto, ListFormCustomizationTypeEnum } from '@/proxy/form/models'
import { useLocalization } from '@/utils/hooks/useLocalization'
import Gantt, {
  Column,
  ContextMenu,
  Editing,
  FilterRow,
  type GanttRef,
  HeaderFilter,
  Item,
  Sorting,
  Tasks,
  Toolbar,
  Validation,
} from 'devextreme-react/gantt'
import { useCallback, useEffect, useRef, useState } from 'react'
import PageTitle from '@/components/shared/PageTitle'
import { useStylesheet } from '@/utils/hooks/useStylesheet'
import { useListFormCustomDataSource } from './useListFormCustomDataSource'
import { layoutTypes } from '../admin/listForm/edit/types'
import WidgetGroup from '@/components/ui/Widget/WidgetGroup'
import { ROUTES_ENUM } from '@/routes/route.constant'
import { usePWA } from '@/utils/hooks/usePWA'
import type { ContentReadyEvent, GanttScaleType } from 'devextreme/ui/gantt'
import { useListFormColumns } from './useListFormColumns'
import CustomStore from 'devextreme/data/custom_store'
import { GridColumnData } from './GridColumnData'
import { Loading } from '@/components/shared'
import { usePermission } from '@/utils/hooks/usePermission'
import { useListFormStateStoring } from './useListFormStateStoring'
import TreeList from 'devextreme/ui/tree_list'
import { postListFormCustomization } from '@/services/list-form-customization.service'
import { useFilters } from './useFilters'
import {
  useListFormCustomSources,
  useListFormGridDto,
  useWidgetGroupHeight,
} from './shared/hooks'
import GridFilterDialogs from './GridFilterDialogs'

type GanttInstance = ReturnType<GanttRef['instance']>
type GanttTreeListInstance = {
  element: () => HTMLElement
  getVisibleColumns: () => Array<Record<string, any>>
  state: {
    (): Record<string, any>
    (value: Record<string, any> | null): void
  }
}

const getGanttTreeList = (gantt: GanttInstance) => {
  const element = (gantt.element() as HTMLElement).querySelector('.dx-treelist')
  return element
    ? (TreeList.getInstance(element as HTMLElement) as unknown as GanttTreeListInstance)
    : undefined
}

interface GanttViewProps {
  listFormCode: string
  searchParams?: URLSearchParams
  isSubForm?: boolean
  level?: number
  refreshData?: () => Promise<void>
  gridDto?: GridDto
}

const GanttView = (props: GanttViewProps) => {
  const { listFormCode, searchParams, isSubForm, gridDto: extGridDto } = props
  const { translate } = useLocalization()
  const isPwaMode = usePWA()

  // Eskiden Helmet'in <link> çocuğuydu; koşul aynen korunuyor.
  useStylesheet(isSubForm ? null : '/css/gantt/dx-gantt.min.css', 'dx-gantt-css')

  const gridRef = useRef<GanttRef | undefined>(undefined)
  const widgetGroupRef = useRef<HTMLDivElement>(null)
  const { checkPermission } = usePermission()

  const [ganttDataSource, setGanttDataSource] = useState<CustomStore<any, any>>()
  const [columnData, setColumnData] = useState<GridColumnData[]>()
  const gridDto = useListFormGridDto(listFormCode, extGridDto)
  const [scaleType, setScaleType] = useState<GanttScaleType>('weeks')
  const [taskListWidth, setTaskListWidth] = useState(500)
  const layout = layoutTypes.gantt || 'gantt'
  const pendingStateRef = useRef<Record<string, any> | undefined>(undefined)
  const loadedStateKeyRef = useRef('')

  const widgetGroupHeight = useWidgetGroupHeight(widgetGroupRef, gridDto?.widgets)
  useListFormCustomSources(gridDto)

  const { customSaveState, customLoadState, storageKey } = useListFormStateStoring({
    listFormCode,
    storageKey: gridDto?.gridOptions.stateStoringDto?.storageKey,
    filterPrefix: 'gantt',
  })
  const ganttFilterRef = useRef<any>({
    instance: () => {
      const gantt = gridRef.current?.instance()
      return gantt ? getGanttTreeList(gantt) : undefined
    },
  })
  const { filterToolbarData, ...filterData } = useFilters({
    gridDto,
    gridRef: ganttFilterRef,
    listFormCode,
  })
  const ganttFilterToolbarData = filterToolbarData.filter((item) =>
    ['saveActiveFilter', 'deleteFilter', 'clearFilter'].includes(item.name ?? ''),
  )

  useEffect(() => {
    setScaleType(gridDto?.gridOptions.ganttOptionDto?.scaleType || 'weeks')
  }, [gridDto])

  // listFormCode değişiminde eski veri kaynağını temizle.
  useEffect(() => {
    gridRef.current?.instance()?.option('dataSource', undefined)
  }, [listFormCode])

  const { createSelectDataSource } = useListFormCustomDataSource({ gridRef })
  const { getBandedColumns } = useListFormColumns({
    gridDto,
    listFormCode,
    isSubForm,
    gridRef,
  })

  useEffect(() => {
    if (!gridDto) return

    const cols = getBandedColumns()
    setColumnData(cols)

    const dataSource = createSelectDataSource(
      gridDto.gridOptions,
      listFormCode,
      searchParams,
      layout,
      undefined,
    )

    setGanttDataSource(dataSource)
  }, [createSelectDataSource, getBandedColumns, gridDto, layout, listFormCode, searchParams])

  const settingButtonClick = useCallback(() => {
    window.open(
      ROUTES_ENUM.protected.saas.listFormManagement.edit.replace(':listFormCode', listFormCode),
      isPwaMode ? '_self' : '_blank',
    )
  }, [isPwaMode, listFormCode])

  const getSettingButtonOptions = useCallback(
    () => ({
      icon: 'preferences',
      text: translate('::ListForms.ListForm.Manage'),
      hint: translate('::ListForms.ListForm.Manage'),
      stylingMode: 'icon',
      onClick: () => {
        settingButtonClick()
      },
    }),
    [settingButtonClick, translate],
  )

  const getRefreshButtonOptions = useCallback(
    () => ({
      icon: 'refresh',
      text: translate('::ListForms.ListForm.Refresh'),
      stylingMode: 'icon',
      onClick: () => {
        gridRef.current?.instance()?.refresh()
      },
    }),
    [translate],
  )

  const getCurrentState = useCallback((gantt: GanttInstance) => {
    const treeList = getGanttTreeList(gantt)
    const state = (treeList?.state() ?? {}) as Record<string, any>
    const visibleColumns = (treeList?.getVisibleColumns() ?? []) as Array<Record<string, any>>
    const headerCells = Array.from(
      (treeList?.element() as HTMLElement | undefined)?.querySelectorAll('.dx-header-row > td') ??
        [],
    )
    const widths = new Map(
      visibleColumns.map((column, index) => [
        column.dataField,
        headerCells[index]?.getBoundingClientRect().width,
      ]),
    )
    const taskListElement = (gantt.element() as HTMLElement).querySelector(
      '.dx-gantt-treelist-wrapper',
    )

    return {
      ...state,
      columns: state.columns?.map((column: Record<string, any>) => {
        const width = widths.get(column.dataField)
        return width ? { ...column, width: Math.round(width) } : column
      }),
      scaleType: gantt.option('scaleType'),
      showDependencies: gantt.option('showDependencies'),
      showResources: gantt.option('showResources'),
      taskListWidth: Math.round(
        taskListElement?.getBoundingClientRect().width ?? gantt.option('taskListWidth') ?? 500,
      ),
    }
  }, [])

  const applyState = useCallback((gantt: GanttInstance, state: Record<string, any>) => {
    const treeList = getGanttTreeList(gantt)
    if (!treeList) return

    const {
      scaleType: savedScaleType,
      showDependencies,
      showResources,
      taskListWidth: savedTaskListWidth,
      treeListState,
      ...treeState
    } = state

    treeList.state(treeListState ?? treeState)
    if (savedScaleType) setScaleType(savedScaleType)
    if (savedTaskListWidth) setTaskListWidth(savedTaskListWidth)
    gantt.option({
      ...(showDependencies !== undefined ? { showDependencies } : {}),
      ...(showResources !== undefined ? { showResources } : {}),
      ...(savedTaskListWidth ? { taskListWidth: savedTaskListWidth } : {}),
    })
  }, [])

  const handleGanttContentReady = useCallback(
    (event: ContentReadyEvent) => {
      if (!pendingStateRef.current) return

      const state = pendingStateRef.current
      pendingStateRef.current = undefined
      requestAnimationFrame(() => requestAnimationFrame(() => applyState(event.component, state)))
    },
    [applyState],
  )

  const saveGanttState = useCallback(() => {
    const gantt = gridRef.current?.instance()
    if (gantt) customSaveState(getCurrentState(gantt)).catch(() => undefined)
  }, [customSaveState, getCurrentState])

  const resetGanttState = useCallback(async () => {
    const gantt = gridRef.current?.instance()
    if (!gantt || !storageKey) return

    await postListFormCustomization({
      listFormCode,
      customizationType: ListFormCustomizationTypeEnum.GridState,
      filterName: `gantt-${storageKey}`,
      customizationData: '',
    })
    getGanttTreeList(gantt)?.state(null)
    setTaskListWidth(500)
  }, [listFormCode, storageKey])

  useEffect(() => {
    if (
      !gridDto?.gridOptions.stateStoringDto?.enabled ||
      !ganttDataSource ||
      !columnData ||
      !storageKey
    )
      return

    const key = `${listFormCode}-${storageKey}`
    if (loadedStateKeyRef.current === key) return
    loadedStateKeyRef.current = key

    customLoadState()
      .then((state) => {
        pendingStateRef.current = state ?? undefined
        const gantt = gridRef.current?.instance()
        if (gantt && state) handleGanttContentReady({ component: gantt } as ContentReadyEvent)
      })
      .catch(() => {
        loadedStateKeyRef.current = ''
      })
  }, [
    columnData,
    customLoadState,
    ganttDataSource,
    gridDto,
    handleGanttContentReady,
    listFormCode,
    storageKey,
  ])

  return (
    <>
      <div ref={widgetGroupRef} className={(gridDto?.widgets?.length ?? 0) > 0 ? 'mt-2' : ''}>
        <WidgetGroup widgetGroups={gridDto?.widgets ?? []} />
      </div>

      <Container className={DX_CLASSNAMES}>
        {!isSubForm && <PageTitle title={translate('::' + gridDto?.gridOptions.title)} />}
        {!gridDto && (
          <div className="p-4">
            <Loading loading>Loading gantt configuration...</Loading>
          </div>
        )}
        {gridDto && !ganttDataSource && (
          <div className="p-4">
            <Loading loading>Loading data source...</Loading>
          </div>
        )}
        {gridDto && columnData && ganttDataSource && (
          <>
            <div className="p-1">
              <Gantt
                ref={gridRef as any}
                key={`Gantt-${listFormCode}-${ganttDataSource ? 'loaded' : 'loading'}`}
                id={'Gantt-' + listFormCode}
                className="list-view-toolbar-host"
                taskListWidth={taskListWidth}
                scaleType={scaleType}
                rootValue={
                  gridDto.gridOptions.ganttOptionDto?.rootValue === '' ||
                  gridDto.gridOptions.ganttOptionDto?.rootValue === undefined
                    ? null
                    : gridDto.gridOptions.ganttOptionDto?.rootValue
                }
                height={
                  gridDto.gridOptions.height > 0
                    ? gridDto.gridOptions.height
                    : gridDto.gridOptions.fullHeight
                      ? `calc(100vh - ${170 + widgetGroupHeight}px)`
                      : undefined
                }
                onContentReady={handleGanttContentReady}
              >
                <Tasks
                  dataSource={ganttDataSource}
                  keyExpr={gridDto.gridOptions.ganttOptionDto?.keyExpr}
                  parentIdExpr={gridDto.gridOptions.ganttOptionDto?.parentIdExpr}
                  titleExpr={gridDto.gridOptions.ganttOptionDto?.titleExpr}
                  startExpr={gridDto.gridOptions.ganttOptionDto?.startExpr}
                  endExpr={gridDto.gridOptions.ganttOptionDto?.endExpr}
                  progressExpr={gridDto.gridOptions.ganttOptionDto?.progressExpr}
                />

                <Toolbar>
                  <Item name="undo" locateInMenu="auto" />
                  <Item name="redo" locateInMenu="auto" />
                  <Item name="separator" locateInMenu="auto" />
                  <Item name="collapseAll" locateInMenu="auto" />
                  <Item name="expandAll" locateInMenu="auto" />
                  {gridDto.gridOptions.ganttOptionDto?.allowTaskAdding && (
                    <Item name="addTask" locateInMenu="auto" />
                  )}
                  {gridDto.gridOptions.ganttOptionDto?.allowTaskDeleting && (
                    <Item name="deleteTask" locateInMenu="auto" />
                  )}
                  <Item name="separator" locateInMenu="auto" />
                  <Item name="zoomIn" locateInMenu="auto" />
                  <Item name="zoomOut" locateInMenu="auto" />
                  <Item name="separator" locateInMenu="auto" />
                  <Item
                    location="after"
                    widget="dxSelectBox"
                    locateInMenu="auto"
                    options={{
                      width: 150,
                      items: [
                        { value: 'auto', text: translate('::Auto') },
                        { value: 'minutes', text: translate('::Minutes') },
                        { value: 'hours', text: translate('::Hours') },
                        { value: 'days', text: translate('::Days') },
                        { value: 'weeks', text: translate('::Weeks') },
                        { value: 'months', text: translate('::Months') },
                        { value: 'quarters', text: translate('::Quarters') },
                        { value: 'years', text: translate('::Years') },
                      ],
                      displayExpr: 'text',
                      valueExpr: 'value',
                      value: scaleType,
                      onValueChanged: (e: any) => setScaleType(e.value),
                    }}
                  />
                  <Item
                    location="after"
                    widget="dxButton"
                    locateInMenu="auto"
                    showText="always"
                    options={getRefreshButtonOptions()}
                  />
                  {ganttFilterToolbarData.map((item) => (
                    <Item
                      key={item.name}
                      name={item.name}
                      location="after"
                      widget="dxButton"
                      locateInMenu="never"
                      showText="always"
                      options={item.options}
                    />
                  ))}
                  {gridDto.gridOptions.stateStoringDto?.enabled && (
                    <Item
                      location="after"
                      widget="dxButton"
                      locateInMenu="auto"
                      showText="always"
                      options={{
                        icon: 'save',
                        text: translate('::ListForms.ListForm.SaveGridState'),
                        hint: translate('::ListForms.ListForm.SaveGridState'),
                        onClick: saveGanttState,
                      }}
                    />
                  )}
                  {gridDto.gridOptions.stateStoringDto?.enabled && (
                    <Item
                      location="after"
                      widget="dxButton"
                      locateInMenu="auto"
                      showText="always"
                      options={{
                        icon: 'revert',
                        text: translate('::ListForms.ListForm.ResetGridState'),
                        hint: translate('::ListForms.ListForm.ResetGridState'),
                        onClick: resetGanttState,
                      }}
                    />
                  )}
                  {checkPermission('App.Listforms.Listform.Update') && (
                    <Item
                      location="after"
                      widget="dxButton"
                      locateInMenu="auto"
                      showText="always"
                      options={getSettingButtonOptions()}
                    />
                  )}
                </Toolbar>

                <Editing
                  enabled={gridDto.gridOptions.ganttOptionDto?.allowEditing}
                  allowTaskAdding={gridDto.gridOptions.ganttOptionDto?.allowTaskAdding}
                  allowTaskUpdating={gridDto.gridOptions.ganttOptionDto?.allowTaskUpdating}
                  allowTaskDeleting={gridDto.gridOptions.ganttOptionDto?.allowTaskDeleting}
                  allowTaskResourceUpdating={
                    gridDto.gridOptions.ganttOptionDto?.allowTaskResourceUpdating
                  }
                  allowDependencyAdding={gridDto.gridOptions.ganttOptionDto?.allowDependencyAdding}
                  allowDependencyDeleting={
                    gridDto.gridOptions.ganttOptionDto?.allowDependencyDeleting
                  }
                  allowResourceAdding={gridDto.gridOptions.ganttOptionDto?.allowResourceAdding}
                  allowResourceDeleting={gridDto.gridOptions.ganttOptionDto?.allowResourceDeleting}
                  allowResourceUpdating={gridDto.gridOptions.ganttOptionDto?.allowResourceUpdating}
                />

                <FilterRow visible={gridDto.gridOptions.filterRowDto?.visible}></FilterRow>
                <HeaderFilter visible={gridDto.gridOptions.headerFilterDto.visible}></HeaderFilter>
                <Sorting mode={gridDto.gridOptions?.sortMode}></Sorting>
                <Validation autoUpdateParentTasks={true} />
                <ContextMenu enabled={false} />

                {columnData
                  .filter((col) => col.type != 'buttons')
                  .map((col: any) => (
                    <Column key={col.dataField} {...col} />
                  ))}
              </Gantt>
              <GridFilterDialogs
                gridRef={ganttFilterRef}
                listFormCode={listFormCode}
                {...filterData}
              />
            </div>
          </>
        )}
      </Container>
    </>
  )
}

export default GanttView