import React, {
  Suspense,
  startTransition,
  useCallback,
  useEffect,
  useMemo,
  useRef,
  useState,
} from 'react'
import '@/utils/registerDevExtremeEditors'
import { useParams, useSearchParams } from 'react-router-dom'
import classNames from 'classnames'

import Container from '@/components/shared/Container'
import { Badge, Button, Dialog } from '@/components/ui'
import RichText from '@/components/shared/RichText'
import { useLocalization } from '@/utils/hooks/useLocalization'
import { useCurrentMenuIcon } from '@/utils/hooks/useCurrentMenuIcon'

import { useStoreActions, useStoreState } from '@/store/store'
import { GridDto } from '@/proxy/form/models'
import { getList } from '@/services/form.service'
import { ListViewLayoutType } from '../admin/listForm/edit/types'

import {
  FaChartArea,
  FaThLarge,
  FaList,
  FaSitemap,
  FaTable,
  FaCalendarAlt,
  FaProjectDiagram,
  FaTasks,
  FaInfoCircle,
} from 'react-icons/fa'

/* =======================
   🔥 LAZY VIEW IMPORTS
   ======================= */
const Grid = React.lazy(() => import('./Grid'))
const CardView = React.lazy(() => import('./CardView'))
const Pivot = React.lazy(() => import('./Pivot'))
const Tree = React.lazy(() => import('./Tree'))
const Chart = React.lazy(() => import('./Chart'))
const GanttView = React.lazy(() => import('./GanttView'))
const SchedulerView = React.lazy(() => import('./SchedulerView'))
const TodoBoard = React.lazy(() => import('./TodoBoard'))

function isLayoutValid(dto: GridDto, layout: ListViewLayoutType | undefined): boolean {
  if (!layout || layout === 'grid') return true
  if (layout === 'card') return true
  if (layout === 'pivot') return !!dto.gridOptions?.layoutDto?.pivot
  if (layout === 'chart') return !!dto.gridOptions?.layoutDto?.chart
  if (layout === 'tree')
    return !!(
      dto.gridOptions?.layoutDto?.tree &&
      dto.gridOptions?.treeOptionDto?.keyExpr &&
      dto.gridOptions?.treeOptionDto?.parentIdExpr
    )
  if (layout === 'gantt')
    return !!(
      dto.gridOptions?.layoutDto?.gantt &&
      dto.gridOptions?.ganttOptionDto?.keyExpr &&
      dto.gridOptions?.ganttOptionDto?.parentIdExpr &&
      dto.gridOptions?.ganttOptionDto?.titleExpr &&
      dto.gridOptions?.ganttOptionDto?.startExpr &&
      dto.gridOptions?.ganttOptionDto?.endExpr &&
      dto.gridOptions?.ganttOptionDto?.progressExpr
    )
  if (layout === 'scheduler')
    return !!(
      dto.gridOptions?.layoutDto?.scheduler &&
      dto.gridOptions?.schedulerOptionDto?.textExpr &&
      dto.gridOptions?.schedulerOptionDto?.startDateExpr &&
      dto.gridOptions?.schedulerOptionDto?.endDateExpr
    )
  if (layout === 'todo')
    return !!(
      dto.gridOptions?.layoutDto?.todo &&
      dto.gridOptions?.todoOptionDto?.titleExpr &&
      dto.gridOptions?.todoOptionDto?.statusExpr
    )
  return false
}

interface ListProps {
  listFormCode?: string
  gridDto?: GridDto
  isSubForm?: boolean
  onRefreshGridDto?: () => Promise<void> | void
  /**
   * Filter carrier of a list embedded in a page. A standalone list reads the
   * page address, but an embedded one is filtered by its host — the designer
   * builds these from static values, the URL or a Form record.
   */
  searchParams?: URLSearchParams
}

const List: React.FC<ListProps> = ({
  listFormCode: externalListFormCode,
  gridDto: externalGridDto,
  isSubForm = false,
  onRefreshGridDto,
  searchParams: externalSearchParams,
}) => {
  const { listFormCode: routeListFormCode = '' } = useParams()
  const listFormCode = externalListFormCode || routeListFormCode
  const [routeSearchParams] = useSearchParams()
  const searchParams = externalSearchParams ?? routeSearchParams

  const { translate } = useLocalization()
  const mode = useStoreState((state) => state.theme.mode)
  const MenuIcon = useCurrentMenuIcon('w-5 h-5')

  const { states } = useStoreState((state) => state.admin.lists)
  const { setStates } = useStoreActions((a) => a.admin.lists)

  const activeListFormCodeRef = useRef(listFormCode)
  activeListFormCodeRef.current = listFormCode

  const [gridDtoState, setGridDtoState] = useState<{
    listFormCode: string
    gridDto: GridDto | null
  }>({ listFormCode: '', gridDto: null })
  const gridDto =
    externalGridDto ??
    (gridDtoState.listFormCode === listFormCode ? gridDtoState.gridDto : null)

  const [viewModeState, setViewModeState] = useState<{
    listFormCode: string
    layoutType?: ListViewLayoutType
  }>({ listFormCode: '' })
  const viewMode = viewModeState.listFormCode === listFormCode ? viewModeState.layoutType : undefined

  /* =======================
     🔹 GRID DTO FETCH
     ======================= */
  const refreshGridDto = useCallback(async () => {
    if (!listFormCode) return

    if (onRefreshGridDto) {
      await onRefreshGridDto()
      return
    }

    const requestedListFormCode = listFormCode
    try {
      const response = await getList({ listFormCode: requestedListFormCode })
      if (activeListFormCodeRef.current !== requestedListFormCode) return
      setGridDtoState({ listFormCode: requestedListFormCode, gridDto: response.data })
    } catch (err) {
      console.error('GridDto load error:', err)
    }
  }, [listFormCode, onRefreshGridDto])

  useEffect(() => {
    if (!externalGridDto) void refreshGridDto()
  }, [externalGridDto, refreshGridDto])

  /* =======================
     🔹 INITIAL VIEW MODE
     ======================= */
  useEffect(() => {
    if (!gridDto) return

    const savedLayout = states.find((s) => s.listFormCode === listFormCode)?.layout
    const defaultLayout = gridDto.gridOptions?.layoutDto?.defaultLayout
    const candidate = savedLayout ?? defaultLayout

    setViewModeState({
      listFormCode,
      layoutType: isLayoutValid(gridDto, candidate) ? candidate : 'grid',
    })
  }, [gridDto, states, listFormCode])

  /* =======================
     🔹 VIEW SWITCH HANDLER
     ======================= */
  const setLayout = useCallback(
    (layout: ListViewLayoutType) => {
      startTransition(() => {
        setViewModeState({ listFormCode, layoutType: layout })
      })
      setStates({ listFormCode, layout })
    },
    [listFormCode, setStates],
  )

  /* =======================
     🔹 PRELOAD MAP (HOVER)
     ======================= */
  const preload = useMemo(
    () => ({
      grid: () => import('./Grid'),
      card: () => import('./CardView'),
      pivot: () => import('./Pivot'),
      tree: () => import('./Tree'),
      chart: () => import('./Chart'),
      gantt: () => import('./GanttView'),
      scheduler: () => import('./SchedulerView'),
      todo: () => import('./TodoBoard'),
    }),
    [],
  )

  /* =======================
     🔹 HEADER DESCRIPTION (LISTFORM DESCRIPTION)
     ======================= */
  // Description bir dil anahtarıdır; karşılığı yoksa translate anahtarı geri döndürür,
  // o durumda kullanıcıya anahtar gösterilmez.
  const [descriptionOpen, setDescriptionOpen] = useState(false)
  const description = useMemo(() => {
    const key = gridDto?.gridOptions?.description
    if (!key) return null
    const text = translate('::' + key)
    return text && text !== key ? text : null
  }, [gridDto?.gridOptions?.description, translate])

  if (!listFormCode || !gridDto || !viewMode) {
    return null
  }

  return (
    <Container>
      {/* =======================
          HEADER
         ======================= */}
      <div
        className={classNames(
          'flex items-center gap-2 pb-1 border-b',
          mode === 'light' ? 'border-gray-200' : 'border-neutral-700',
        )}
      >
        {MenuIcon}
        {description ? (
          <button
            className="flex items-center gap-1 text-sm font-medium hover:underline"
            title={translate('::App.Platform.ShowDescription')}
            type="button"
            onClick={() => setDescriptionOpen(true)}
          >
            <h4 className="text-sm font-medium">{translate('::' + gridDto.gridOptions.title)}</h4>
            <FaInfoCircle className="text-xs opacity-60" />
          </button>
        ) : (
          <h4 className="text-sm font-medium">{translate('::' + gridDto.gridOptions.title)}</h4>
        )}
        <Badge content={viewMode} />

        {/* =======================
            VIEW BUTTONS
           ======================= */}
        <div className="flex gap-1 ml-auto">
          {gridDto?.gridOptions?.layoutDto.todo &&
            gridDto?.gridOptions?.todoOptionDto?.titleExpr &&
            gridDto?.gridOptions?.todoOptionDto?.statusExpr && (
              <Button
                size="sm"
                icon={<FaTasks />}
                variant={viewMode === 'todo' ? 'solid' : 'default'}
                onClick={() => setLayout('todo')}
                onMouseEnter={() => preload.todo()}
                title={translate('::App.Platform.TabTodo')}
              />
            )}
          {gridDto?.gridOptions?.layoutDto.scheduler &&
            gridDto?.gridOptions?.schedulerOptionDto?.textExpr &&
            gridDto?.gridOptions?.schedulerOptionDto?.startDateExpr && (
              <Button
                size="sm"
                icon={<FaCalendarAlt />}
                variant={viewMode === 'scheduler' ? 'solid' : 'default'}
                onClick={() => setLayout('scheduler')}
                onMouseEnter={() => preload.scheduler()}
                title={translate('::App.Platform.TabScheduler')}
              ></Button>
            )}

          {gridDto?.gridOptions?.layoutDto.gantt &&
            gridDto?.gridOptions?.ganttOptionDto?.parentIdExpr &&
            gridDto?.gridOptions?.ganttOptionDto?.titleExpr && (
              <Button
                size="sm"
                icon={<FaProjectDiagram />}
                variant={viewMode === 'gantt' ? 'solid' : 'default'}
                onClick={() => setLayout('gantt')}
                onMouseEnter={() => preload.gantt()}
                title={translate('::App.Platform.TabGantt')}
              ></Button>
            )}

          {gridDto?.gridOptions?.layoutDto.tree &&
            gridDto?.gridOptions?.treeOptionDto?.parentIdExpr && (
              <Button
                size="sm"
                icon={<FaSitemap />}
                variant={viewMode === 'tree' ? 'solid' : 'default'}
                onClick={() => setLayout('tree')}
                onMouseEnter={() => preload.tree()}
                title={translate('::App.Platform.TabTree')}
              ></Button>
            )}

          <Button
            size="sm"
            icon={<FaList />}
            variant={viewMode === 'grid' ? 'solid' : 'default'}
            onClick={() => setLayout('grid')}
            onMouseEnter={() => preload.grid()}
            title={translate('::App.ListFormEdit.TabGrid')}
          ></Button>

          {gridDto.gridOptions.layoutDto.card && (
            <Button
              size="sm"
              icon={<FaThLarge />}
              variant={viewMode === 'card' ? 'solid' : 'default'}
              onClick={() => setLayout('card')}
              onMouseEnter={() => preload.card()}
              title={translate('::App.ListFormEdit.TabCard')}
            ></Button>
          )}

          {gridDto.gridOptions.layoutDto.pivot && (
            <Button
              size="sm"
              icon={<FaTable />}
              variant={viewMode === 'pivot' ? 'solid' : 'default'}
              onClick={() => setLayout('pivot')}
              onMouseEnter={() => preload.pivot()}
              title={translate('::App.Platform.TabPivot')}
            ></Button>
          )}

          {gridDto.gridOptions.layoutDto.chart && (
            <Button
              size="sm"
              icon={<FaChartArea />}
              variant={viewMode === 'chart' ? 'solid' : 'default'}
              onClick={() => setLayout('chart')}
              onMouseEnter={() => preload.chart()}
              title={translate('::App.Platform.Chart')}
            ></Button>
          )}
        </div>
      </div>

      {/* =======================
          VIEW RENDER
         ======================= */}
      <Suspense fallback={<div className="p-4 text-sm">{translate('::App.Platform.LoadingWithThreeDot')}</div>}>
        {viewMode === 'grid' && (
          <Grid
            listFormCode={listFormCode}
            searchParams={searchParams}
            isSubForm={isSubForm}
            gridDto={gridDto}
          />
        )}

        {viewMode === 'card' && (
          <CardView
            listFormCode={listFormCode}
            searchParams={searchParams}
            isSubForm={isSubForm}
            gridDto={gridDto}
          />
        )}

        {viewMode === 'pivot' && (
          <Pivot
            listFormCode={listFormCode}
            searchParams={searchParams}
            isSubForm={isSubForm}
            gridDto={gridDto}
            refreshGridDto={refreshGridDto}
          />
        )}

        {viewMode === 'tree' && (
          <Tree
            listFormCode={listFormCode}
            searchParams={searchParams}
            isSubForm={isSubForm}
            gridDto={gridDto}
          />
        )}

        {viewMode === 'scheduler' && (
          <SchedulerView
            listFormCode={listFormCode}
            searchParams={searchParams}
            isSubForm={isSubForm}
            gridDto={gridDto}
          />
        )}

        {viewMode === 'gantt' && (
          <GanttView
            listFormCode={listFormCode}
            searchParams={searchParams}
            isSubForm={isSubForm}
            gridDto={gridDto}
          />
        )}

        {viewMode === 'todo' && (
          <TodoBoard
            listFormCode={listFormCode}
            searchParams={searchParams}
            isSubForm={isSubForm}
            gridDto={gridDto}
          />
        )}

        {viewMode === 'chart' && (
          <Chart
            id={gridDto?.gridOptions.id as string}
            listFormCode={listFormCode}
            filter={searchParams.toString()}
            isSubForm={true}
            gridDto={gridDto}
            refreshGridDto={refreshGridDto}
          />
        )}
      </Suspense>

      {description && (
        <Dialog
          isOpen={descriptionOpen}
          width={860}
          onClose={() => setDescriptionOpen(false)}
          onRequestClose={() => setDescriptionOpen(false)}
        >
          <Dialog.Header className="-mt-5 p-2 border-b border-gray-200 dark:border-gray-700">
            <h2 className="text-lg font-semibold text-gray-800 dark:text-gray-100">
              {translate('::' + gridDto.gridOptions.title)}
            </h2>
          </Dialog.Header>
          <Dialog.Body className="mt-2 max-h-[70vh] select-text overflow-y-auto pr-1">
            <RichText text={description} />
          </Dialog.Body>
        </Dialog>
      )}
    </Container>
  )
}

export default List