import {
  cloneElement,
  isValidElement,
  useEffect,
  useState,
  type ReactElement,
  type ReactNode,
} from 'react'
import {
  useTable,
  type ColumnDef,
  type ColumnVisibilityState,
  type ExpandedState,
  type OnChangeFn,
  type PaginationState,
  type RowSelectionState,
  type SortingState,
} from '@tanstack/react-table'
import { Columns3Icon } from 'lucide-react'

import { Button } from '@evobgp/ui/components/button'
import { Separator } from '@evobgp/ui/components/separator'
import { cn } from '@evobgp/ui/lib/utils'
import {
  DataGrid,
  dataGridFeatures,
  type DataGridFeatures,
  type DataGridTableInstance,
} from '@/components/reui/data-grid/data-grid'
import { DataGridColumnHeader } from '@/components/reui/data-grid/data-grid-column-header'
import { DataGridColumnVisibility } from '@/components/reui/data-grid/data-grid-column-visibility'
import { DataGridPagination } from '@/components/reui/data-grid/data-grid-pagination'
import { DataGridScrollArea } from '@/components/reui/data-grid/data-grid-scroll-area'
import {
  DataGridTable,
  DataGridTableRowExpand,
  DataGridTableRowSelect,
  DataGridTableRowSelectAll,
} from '@/components/reui/data-grid/data-grid-table'
import { DataGridTableVirtual } from '@/components/reui/data-grid/data-grid-table-virtual'
import {
  Frame,
  FrameDescription,
  FrameFooter,
  FrameHeader,
  FramePanel,
  FrameTitle,
} from '@/components/reui/frame'
import { EmptyState } from '@/components/empty-state'
import { DATA_GRID_PAGINATION_RU } from '@/lib/data-grid-defaults'

export type DataGridColumnDef<TData extends object> = ColumnDef<DataGridFeatures, TData>

/**
 * Единый tableLayout для всех ops-гридов.
 * Visual SoT: установленный data-grid-filtering-2 (`dense: true`, без zebra).
 * Preview: https://reui.io/preview/base/data-grid-filtering-2
 * Docs: https://reui.io/docs/components/base/data-grid
 */
export function kitDataGridTableLayout(
  opts: {
    dense?: boolean
    width?: 'fixed' | 'auto'
    columnsPinnable?: boolean
    columnsVisibility?: boolean
  } = {},
) {
  return {
    dense: opts.dense ?? true,
    rowBorder: true,
    headerSticky: false,
    headerBackground: false,
    headerBorder: true,
    width: opts.width ?? ('fixed' as const),
    columnsVisibility: opts.columnsVisibility ?? false,
    columnsResizable: false,
    columnsPinnable: opts.columnsPinnable ?? false,
    columnsMovable: false,
    rowsDraggable: false,
    rowsPinnable: false,
  }
}

/** filtering-2 edge inset + Frame-surface pinned cells (not page --background). */
export const kitDataGridTableClassNames = {
  base: '[&_[data-pinned]]:bg-(--frame-panel-bg)',
  edgeCell: 'first:ps-3 last:pe-3',
} as const

/**
 * Compact action column size from data-grid-filtering-2.
 * Preview: https://reui.io/preview/base/data-grid-filtering-2
 */
export const KIT_ACTION_COLUMN_SIZE = 56

const ACTION_CELL_ALIGN = 'flex items-center justify-end'

function lastColumnId<T extends object>(columns: DataGridColumnDef<T>[]): string {
  const last = columns[columns.length - 1]
  if (!last) return ''
  if (last.id) return last.id
  if ('accessorKey' in last && typeof last.accessorKey === 'string') return last.accessorKey
  return ''
}

function wrapActionCell<T extends object>(
  cell: DataGridColumnDef<T>['cell'],
): DataGridColumnDef<T>['cell'] {
  if (typeof cell !== 'function') {
    return () => <div className={ACTION_CELL_ALIGN}>{cell as ReactNode}</div>
  }
  return (ctx) => <div className={ACTION_CELL_ALIGN}>{cell(ctx)}</div>
}

/**
 * filtering-2 action column DNA: locked width, no sort/resize, inner justify-end
 * (flex on the cell wrapper, never on `td` — that breaks rowBorder alignment).
 * Preview: https://reui.io/preview/base/data-grid-filtering-2
 */
export function applyKitActionColumn<T extends object>(
  columns: DataGridColumnDef<T>[],
  opts: { pinLastColumn?: boolean } = {},
): DataGridColumnDef<T>[] {
  if (columns.length === 0) return columns
  const last = columns[columns.length - 1]
  const lastId = lastColumnId(columns)
  if (lastId !== 'actions' && !opts.pinLastColumn) return columns

  const size = last.size ?? KIT_ACTION_COLUMN_SIZE
  return [
    ...columns.slice(0, -1),
    {
      ...last,
      size,
      minSize: last.minSize ?? size,
      maxSize: last.maxSize ?? size,
      enableSorting: false,
      enableResizing: false,
      cell: last.cell ? wrapActionCell(last.cell) : last.cell,
    },
  ]
}

/** End-pin only when the grid actually scrolls horizontally (not for action columns). */
export function kitColumnPinning(opts: {
  pinLastColumn?: boolean
  horizontalScroll?: boolean
  lastColId: string
  pinLeftColumnIds?: string[]
}): {
  enablePinning: boolean
  columnPinning: { start: string[]; end: string[] }
} {
  const pinLeft = opts.pinLeftColumnIds ?? []
  const pinEnd = Boolean(opts.pinLastColumn && opts.horizontalScroll && opts.lastColId)
  return {
    enablePinning: pinEnd || pinLeft.length > 0,
    columnPinning: {
      start: pinLeft,
      end: pinEnd ? [opts.lastColId] : [],
    },
  }
}

function loadStoredColumnVisibility(key: string): ColumnVisibilityState | undefined {
  try {
    const raw = localStorage.getItem(key)
    if (!raw) return undefined
    return JSON.parse(raw) as ColumnVisibilityState
  } catch {
    return undefined
  }
}

export { loadStoredColumnVisibility }

function applyColumnPinControls<T extends object>(
  columns: DataGridColumnDef<T>[],
  columnPinControls: boolean,
): DataGridColumnDef<T>[] {
  return columns.map((col) => {
    const origHeader = col.header
    if (typeof origHeader !== 'function') return col
    return {
      ...col,
      header: (ctx) => {
        const node = origHeader(ctx)
        if (isValidElement(node) && node.type === DataGridColumnHeader) {
          return cloneElement(node as ReactElement<{ pinnable?: boolean }>, {
            pinnable: columnPinControls,
          })
        }
        return node
      },
    } as DataGridColumnDef<T>
  })
}

export interface FrameDataGridProps<TData extends object> {
  title?: ReactNode
  description?: ReactNode
  actions?: ReactNode
  columns: DataGridColumnDef<TData>[]
  data: TData[]
  rowId?: (row: TData, index: number) => string
  emptyTitle?: string
  emptyDescription?: string
  emptyAction?: ReactNode
  onRowClick?: (row: TData) => void
  pagination?: boolean
  pageSize?: number
  footerContent?: ReactNode
  dense?: boolean
  pinLastColumn?: boolean
  initialSorting?: SortingState
  virtualization?: boolean
  height?: number
  enableRowSelection?: boolean
  onRowSelectionChange?: (selectedIds: string[]) => void
  enableColumnVisibility?: boolean
  columnVisibility?: ColumnVisibilityState
  onColumnVisibilityChange?: OnChangeFn<ColumnVisibilityState>
  columnVisibilityTrigger?: boolean
  columnVisibilityStorageKey?: string
  initialColumnVisibility?: ColumnVisibilityState
  className?: string
  expandedContent?: (row: TData) => ReactNode
  getRowCanExpand?: (row: TData) => boolean
  pinLeftColumnIds?: string[]
  horizontalScroll?: boolean
  tableWidth?: 'fixed' | 'auto'
  columnPinControls?: boolean
  isLoading?: boolean
}

function DataGridSectionHeader({
  title,
  description,
  actions,
}: {
  title?: ReactNode
  description?: ReactNode
  actions?: ReactNode
}) {
  if (!title && !description && !actions) return null

  return (
    <FrameHeader className="flex-row items-start justify-between gap-3">
      <div className="flex min-w-0 flex-col gap-px">
        {title ? <FrameTitle className="text-balance">{title}</FrameTitle> : null}
        {description ? (
          <FrameDescription className="text-xs text-pretty">{description}</FrameDescription>
        ) : null}
      </div>
      {actions ? (
        <div className="flex shrink-0 flex-wrap items-center justify-end gap-2">{actions}</div>
      ) : null}
    </FrameHeader>
  )
}

function FrameDataGridBody<TData extends object>({
  table,
  data,
  emptyTitle,
  onRowClick,
  dense,
  virtualization,
  height,
  footerContent,
  showPagination,
  enableColumnVisibility,
  columnsPinnable,
  tableWidth,
}: {
  table: DataGridTableInstance<TData>
  data: TData[]
  emptyTitle: string
  onRowClick?: (row: TData) => void
  dense: boolean
  virtualization: boolean
  height: number
  footerContent?: ReactNode
  showPagination: boolean
  enableColumnVisibility: boolean
  columnsPinnable: boolean
  tableWidth: 'fixed' | 'auto'
}) {
  const tableNode = virtualization ? (
    <DataGridTableVirtual height={height} footerContent={footerContent} />
  ) : (
    <DataGridTable footerContent={footerContent} />
  )

  return (
    <DataGrid
      table={table}
      recordCount={data.length}
      onRowClick={onRowClick}
      emptyMessage={emptyTitle}
      tableLayout={kitDataGridTableLayout({
        dense,
        width: tableWidth,
        columnsPinnable,
        columnsVisibility: enableColumnVisibility,
      })}
      tableClassNames={kitDataGridTableClassNames}
    >
      {virtualization ? (
        <DataGridScrollArea orientation="vertical" style={{ height }}>
          {tableNode}
        </DataGridScrollArea>
      ) : (
        <DataGridScrollArea>{tableNode}</DataGridScrollArea>
      )}
      {showPagination ? (
        <>
          <Separator />
          <FrameFooter>
            <DataGridPagination {...DATA_GRID_PAGINATION_RU} />
          </FrameFooter>
        </>
      ) : null}
    </DataGrid>
  )
}

export function FrameDataGrid<TData extends object>({
  title,
  description,
  actions,
  columns,
  data,
  rowId,
  emptyTitle = 'Нет записей',
  emptyDescription,
  emptyAction,
  onRowClick,
  pagination,
  pageSize = 10,
  footerContent,
  dense = true,
  pinLastColumn = false,
  initialSorting,
  virtualization = false,
  height = 480,
  enableRowSelection = false,
  onRowSelectionChange,
  enableColumnVisibility = false,
  columnVisibility: columnVisibilityProp,
  onColumnVisibilityChange,
  columnVisibilityTrigger,
  columnVisibilityStorageKey,
  initialColumnVisibility,
  className,
  expandedContent,
  getRowCanExpand,
  pinLeftColumnIds,
  horizontalScroll = false,
  tableWidth = 'fixed',
  columnPinControls = false,
}: FrameDataGridProps<TData>) {
  const showPagination = pagination ?? true
  const [sorting, setSorting] = useState<SortingState>(initialSorting ?? [])
  const [rowSelection, setRowSelection] = useState<RowSelectionState>({})
  const [expanded, setExpanded] = useState<ExpandedState>({})
  const [paginationState, setPaginationState] = useState<PaginationState>({
    pageIndex: 0,
    pageSize: showPagination ? pageSize : Number.POSITIVE_INFINITY,
  })
  const [internalColumnVisibility, setInternalColumnVisibility] = useState<ColumnVisibilityState>(
    () => {
      const stored = columnVisibilityStorageKey
        ? loadStoredColumnVisibility(columnVisibilityStorageKey)
        : undefined
      return { ...initialColumnVisibility, ...stored }
    },
  )

  const isColumnVisibilityControlled = columnVisibilityProp !== undefined
  const columnVisibility = isColumnVisibilityControlled
    ? columnVisibilityProp
    : internalColumnVisibility
  const setColumnVisibility: OnChangeFn<ColumnVisibilityState> = isColumnVisibilityControlled
    ? (onColumnVisibilityChange ?? (() => undefined))
    : setInternalColumnVisibility

  useEffect(() => {
    setPaginationState((current) => ({
      pageIndex: showPagination ? current.pageIndex : 0,
      pageSize: showPagination ? pageSize : Number.POSITIVE_INFINITY,
    }))
  }, [pageSize, showPagination])

  useEffect(() => {
    if (isColumnVisibilityControlled || !columnVisibilityStorageKey) return
    localStorage.setItem(columnVisibilityStorageKey, JSON.stringify(columnVisibility))
  }, [columnVisibility, columnVisibilityStorageKey, isColumnVisibilityControlled])

  const selectColumn: DataGridColumnDef<TData> = {
    id: 'select',
    header: () => <DataGridTableRowSelectAll />,
    cell: ({ row }) => <DataGridTableRowSelect row={row} />,
    enableSorting: false,
    enableHiding: false,
    size: 40,
    meta: { cellClassName: 'w-10' },
  }

  const expandColumn: DataGridColumnDef<TData> = {
    id: 'expand',
    header: () => null,
    cell: ({ row }) => <DataGridTableRowExpand row={row} />,
    enableSorting: false,
    enableHiding: false,
    size: 40,
    meta: {
      cellClassName: 'w-10',
      expandedContent,
    },
  }

  const tableColumns: DataGridColumnDef<TData>[] = applyColumnPinControls(
    applyKitActionColumn(
      [
        ...(expandedContent ? [expandColumn] : []),
        ...(enableRowSelection ? [selectColumn] : []),
        ...columns,
      ],
      { pinLastColumn },
    ),
    columnPinControls,
  )

  const { enablePinning, columnPinning } = kitColumnPinning({
    pinLastColumn,
    horizontalScroll,
    lastColId: lastColumnId(tableColumns),
    pinLeftColumnIds,
  })

  const table = useTable({
    features: dataGridFeatures,
    data,
    columns: tableColumns,
    state: {
      sorting,
      pagination: paginationState,
      columnVisibility,
      expanded,
      ...(enablePinning ? { columnPinning } : {}),
      ...(enableRowSelection ? { rowSelection } : {}),
    },
    onSortingChange: setSorting,
    onPaginationChange: setPaginationState,
    onExpandedChange: setExpanded,
    onColumnVisibilityChange: setColumnVisibility,
    onRowSelectionChange: enableRowSelection
      ? (updater) => {
          setRowSelection((prev) => {
            const next = typeof updater === 'function' ? updater(prev) : updater
            if (onRowSelectionChange && rowId) {
              const ids = Object.keys(next).filter((k) => next[k])
              onRowSelectionChange(ids)
            }
            return next
          })
        }
      : undefined,
    initialState: enablePinning ? { columnPinning } : undefined,
    getRowId: rowId ? (row, index) => rowId(row, index) : undefined,
    getRowCanExpand: expandedContent
      ? (row) => (getRowCanExpand ? getRowCanExpand(row.original) : true)
      : undefined,
    enableRowSelection,
    enableHiding: enableColumnVisibility,
  })

  const showColumnVisibilityTrigger =
    enableColumnVisibility && (columnVisibilityTrigger ?? true)

  const columnVisibilityAction = showColumnVisibilityTrigger ? (
    <DataGridColumnVisibility
      table={table}
      trigger={
        <Button variant="ghost" size="sm">
          <Columns3Icon data-icon="inline-start" />
          Колонки
        </Button>
      }
    />
  ) : null

  const headerActions = actions ? (
    <div className="flex items-center gap-2">
      {columnVisibilityAction}
      {actions}
    </div>
  ) : (
    columnVisibilityAction
  )

  const hasHeader = Boolean(title || description || actions || showColumnVisibilityTrigger)

  if (data.length === 0) {
    return (
      <Frame dense variant="default" spacing="sm" className={cn('w-full', className)}>
        {hasHeader ? (
          <DataGridSectionHeader title={title} description={description} actions={headerActions} />
        ) : null}
        <FramePanel className="flex min-h-72 w-full flex-col items-center justify-center">
          <EmptyState title={emptyTitle} description={emptyDescription} action={emptyAction} />
        </FramePanel>
      </Frame>
    )
  }

  return (
    <Frame dense variant="default" spacing="sm" className={cn('w-full', className)}>
      {hasHeader ? (
        <DataGridSectionHeader title={title} description={description} actions={headerActions} />
      ) : null}
      <FramePanel className="p-0 shadow-none!">
        <FrameDataGridBody
          table={table}
          data={data}
          emptyTitle={emptyTitle}
          onRowClick={onRowClick}
          dense={dense}
          virtualization={virtualization}
          height={height}
          footerContent={footerContent}
          showPagination={showPagination}
          enableColumnVisibility={enableColumnVisibility}
          columnsPinnable={enablePinning}
          tableWidth={tableWidth}
        />
      </FramePanel>
    </Frame>
  )
}