'use client'

import { useState, useEffect } from 'react'
import { Button } from '@/components/ui/button'
import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogTrigger } from '@/components/ui/dialog'
import { Input } from '@/components/ui/input'
import { Badge } from '@/components/ui/badge'
import { Search, Check } from 'lucide-react'
import { 
  ColumnDef,
  flexRender,
  getCoreRowModel,
  getFilteredRowModel,
  getPaginationRowModel,
  getSortedRowModel,
  useReactTable,
  SortingState,
  ColumnFiltersState,
  VisibilityState,
  RowSelectionState,
} from '@tanstack/react-table'
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from '@/components/ui/table'
import { Checkbox } from '@/components/ui/checkbox'
import { getItems } from '../actions/data-actions'
import { toast } from 'sonner'
import { Item } from '../types/item'

interface ItemSelectorProps {
  selectedItems: number[]
  onItemsSelect: (itemIds: number[], itemsData?: Item[]) => void
  disabled?: boolean
}

export function ItemSelector({ selectedItems, onItemsSelect, disabled }: ItemSelectorProps) {
  const [open, setOpen] = useState(false)
  const [items, setItems] = useState<Item[]>([])
  const [loading, setLoading] = useState(false)
  const [sorting, setSorting] = useState<SortingState>([])
  const [columnFilters, setColumnFilters] = useState<ColumnFiltersState>([])
  const [columnVisibility, setColumnVisibility] = useState<VisibilityState>({})
  const [rowSelection, setRowSelection] = useState<RowSelectionState>({})
  const [globalFilter, setGlobalFilter] = useState('')

  const columns: ColumnDef<Item>[] = [
    {
      id: 'select',
      header: ({ table }) => (
        <Checkbox
          checked={table.getIsAllPageRowsSelected()}
          onCheckedChange={(value) => table.toggleAllPageRowsSelected(!!value)}
          aria-label="Select all"
        />
      ),
      cell: ({ row }) => (
        <Checkbox
          checked={row.getIsSelected()}
          onCheckedChange={(value) => row.toggleSelected(!!value)}
          aria-label="Select row"
        />
      ),
      enableSorting: false,
      enableHiding: false,
    },
    // 현업 관심 필드들 (우선 순위)
    {
      accessorKey: 'ProjectNo',
      header: '프로젝트 번호',
      cell: ({ row }) => (
        <div className="font-mono text-sm font-medium">{row.getValue('ProjectNo')}</div>
      ),
    },
    {
      accessorKey: 'itemName',
      header: '아이템명',
      cell: ({ row }) => (
        <div className="font-medium max-w-[200px] truncate">{row.getValue('itemName')}</div>
      ),
    },
    {
      accessorKey: 'packageCode',
      header: '패키지 코드',
      cell: ({ row }) => (
        <div className="font-mono text-sm">{row.getValue('packageCode')}</div>
      ),
    },
    // 추가 필드들
    {
      accessorKey: 'itemCode',
      header: '아이템 코드',
      cell: ({ row }) => {
        const code = row.getValue('itemCode') as string | null
        return code ? (
          <div className="font-mono text-sm">{code}</div>
        ) : (
          <span className="text-muted-foreground">-</span>
        )
      },
    },
    {
      accessorKey: 'description',
      header: '설명',
      cell: ({ row }) => {
        const description = row.getValue('description') as string | null
        return description ? (
          <div className="max-w-[250px] truncate text-sm">{description}</div>
        ) : (
          <span className="text-muted-foreground">-</span>
        )
      },
    },
    {
      accessorKey: 'unitOfMeasure',
      header: '단위',
      cell: ({ row }) => {
        const unit = row.getValue('unitOfMeasure') as string | null
        return unit ? (
          <Badge variant="outline" className="text-xs">{unit}</Badge>
        ) : (
          <span className="text-muted-foreground">-</span>
        )
      },
    },
    {
      accessorKey: 'smCode',
      header: 'SM 코드',
      cell: ({ row }) => {
        const code = row.getValue('smCode') as string | null
        return code ? (
          <div className="font-mono text-xs">{code}</div>
        ) : (
          <span className="text-muted-foreground">-</span>
        )
      },
    },
    {
      accessorKey: 'steelType',
      header: '강종',
      cell: ({ row }) => {
        const steelType = row.getValue('steelType') as string | null
        return steelType ? (
          <Badge variant="secondary" className="text-xs">{steelType}</Badge>
        ) : (
          <span className="text-muted-foreground">-</span>
        )
      },
    },
    {
      accessorKey: 'itemLevel',
      header: '레벨',
      cell: ({ row }) => {
        const level = row.getValue('itemLevel') as number | null
        return level !== null ? (
          <div className="text-sm text-center">{level}</div>
        ) : (
          <span className="text-muted-foreground">-</span>
        )
      },
    },
  ]

  const table = useReactTable({
    data: items,
    columns,
    onSortingChange: setSorting,
    onColumnFiltersChange: setColumnFilters,
    onColumnVisibilityChange: setColumnVisibility,
    onRowSelectionChange: setRowSelection,
    onGlobalFilterChange: setGlobalFilter,
    getCoreRowModel: getCoreRowModel(),
    getPaginationRowModel: getPaginationRowModel(),
    getSortedRowModel: getSortedRowModel(),
    getFilteredRowModel: getFilteredRowModel(),
    state: {
      sorting,
      columnFilters,
      columnVisibility,
      rowSelection,
      globalFilter,
    },
    initialState: {
      pagination: {
        pageSize: 10,
      },
    },
  })

  const loadItems = async () => {
    setLoading(true)
    try {
      const result = await getItems()
      if (result.success && result.data) {
        setItems(result.data)
      } else {
        toast.error(result.error)
      }
    } catch {
      toast.error('아이템을 불러오는 중 오류가 발생했습니다.')
    } finally {
      setLoading(false)
    }
  }

  const handleConfirmSelection = () => {
    const selectedRows = table.getFilteredSelectedRowModel().rows
    const selectedItemIds = selectedRows.map(row => row.original.id)
    const selectedItemsData = selectedRows.map(row => row.original)
    onItemsSelect(selectedItemIds, selectedItemsData)
    setOpen(false)
  }

  // 선택된 아이템 수 계산
  const selectedCount = Object.keys(rowSelection).length

  useEffect(() => {
    if (open && items.length === 0) {
      loadItems()
    }
  }, [open])

  // 기존 선택 상태를 rowSelection에 반영
  useEffect(() => {
    if (items.length > 0 && selectedItems.length > 0) {
      const newRowSelection: RowSelectionState = {}
      items.forEach((item, index) => {
        if (selectedItems.includes(item.id)) {
          newRowSelection[index] = true
        }
      })
      setRowSelection(newRowSelection)
    }
  }, [items, selectedItems])

  return (
    <Dialog open={open} onOpenChange={setOpen}>
      <DialogTrigger asChild>
        <Button variant="outline" disabled={disabled} className="w-full justify-start">
          {selectedItems.length > 0 ? (
            <span>{selectedItems.length}개 아이템 선택됨</span>
          ) : (
            <span className="text-muted-foreground">아이템을 선택하세요</span>
          )}
        </Button>
      </DialogTrigger>
      <DialogContent className="max-w-7xl max-h-[90vh]">
        <DialogHeader>
          <DialogTitle>아이템 선택</DialogTitle>
        </DialogHeader>
        
        <div className="space-y-4">
          <div className="flex items-center justify-between">
            <div className="flex items-center space-x-2 flex-1">
              <Search className="h-4 w-4" />
              <Input
                placeholder="프로젝트 번호, 아이템명, 패키지 코드, 설명으로 검색..."
                value={globalFilter}
                onChange={(e) => setGlobalFilter(e.target.value)}
                className="flex-1"
              />
            </div>
            <div className="text-sm text-muted-foreground ml-4">
              {selectedCount}개 선택됨
            </div>
          </div>

          {loading ? (
            <div className="flex justify-center py-8">
              <div className="text-sm text-muted-foreground">아이템을 불러오는 중...</div>
            </div>
          ) : (
            <div className="border rounded-md max-h-[60vh] overflow-auto">
              <Table>
                <TableHeader>
                  {table.getHeaderGroups().map((headerGroup) => (
                    <TableRow key={headerGroup.id}>
                      {headerGroup.headers.map((header) => (
                        <TableHead key={header.id} className="sticky top-0 bg-background">
                          {header.isPlaceholder
                            ? null
                            : flexRender(
                                header.column.columnDef.header,
                                header.getContext()
                              )}
                        </TableHead>
                      ))}
                    </TableRow>
                  ))}
                </TableHeader>
                <TableBody>
                  {table.getRowModel().rows?.length ? (
                    table.getRowModel().rows.map((row) => (
                      <TableRow
                        key={row.id}
                        data-state={row.getIsSelected() && "selected"}
                        className="cursor-pointer hover:bg-muted/50"
                        onClick={() => row.toggleSelected()}
                      >
                        {row.getVisibleCells().map((cell) => (
                          <TableCell key={cell.id} className="py-2">
                            {flexRender(
                              cell.column.columnDef.cell,
                              cell.getContext()
                            )}
                          </TableCell>
                        ))}
                      </TableRow>
                    ))
                  ) : (
                    <TableRow>
                      <TableCell
                        colSpan={columns.length}
                        className="h-24 text-center"
                      >
                        검색 결과가 없습니다.
                      </TableCell>
                    </TableRow>
                  )}
                </TableBody>
              </Table>
            </div>
          )}

          <div className="flex items-center justify-between">
            <div className="text-sm text-muted-foreground">
              총 {table.getFilteredRowModel().rows.length}개 아이템
            </div>
            <div className="flex items-center space-x-2">
              <Button
                variant="outline"
                size="sm"
                onClick={() => table.previousPage()}
                disabled={!table.getCanPreviousPage()}
              >
                이전
              </Button>
              <div className="text-sm">
                {table.getState().pagination.pageIndex + 1} / {table.getPageCount()}
              </div>
              <Button
                variant="outline"
                size="sm"
                onClick={() => table.nextPage()}
                disabled={!table.getCanNextPage()}
              >
                다음
              </Button>
            </div>
          </div>

          <div className="flex justify-end space-x-2 pt-4 border-t">
            <Button variant="outline" onClick={() => setOpen(false)}>
              취소
            </Button>
            <Button onClick={handleConfirmSelection} disabled={selectedCount === 0}>
              {selectedCount}개 아이템 선택 확인
            </Button>
          </div>
        </div>
      </DialogContent>
    </Dialog>
  )
}