'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 { getVendors } from '../actions/data-actions'
import { toast } from 'sonner'

interface Vendor {
  id: number
  vendorName: string
  vendorCode: string | null
  status: string
}

interface VendorSelectorProps {
  selectedVendor?: Vendor
  onVendorSelect: (vendor: Vendor) => void
  disabled?: boolean
}

export function VendorSelector({ selectedVendor, onVendorSelect, disabled }: VendorSelectorProps) {
  const [open, setOpen] = useState(false)
  const [vendors, setVendors] = useState<Vendor[]>([])
  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<Vendor>[] = [
    {
      accessorKey: 'vendorName',
      header: '벤더명',
      cell: ({ row }) => (
        <div className="font-medium">{row.getValue('vendorName')}</div>
      ),
    },
    {
      accessorKey: 'vendorCode',
      header: '벤더 코드',
      cell: ({ row }) => {
        const code = row.getValue('vendorCode') as string | null
        return code ? (
          <div className="font-mono text-sm">{code}</div>
        ) : (
          <span className="text-muted-foreground">-</span>
        )
      },
    },
    {
      accessorKey: 'status',
      header: '상태',
      cell: ({ row }) => {
        const status = row.getValue('status') as string
        const getStatusColor = (status: string) => {
          switch (status) {
            case 'ACTIVE': return 'bg-green-100 text-green-800'
            case 'APPROVED': return 'bg-blue-100 text-blue-800'
            case 'PENDING_REVIEW': return 'bg-yellow-100 text-yellow-800'
            case 'INACTIVE': return 'bg-gray-100 text-gray-800'
            default: return 'bg-gray-100 text-gray-800'
          }
        }
        return (
          <Badge className={getStatusColor(status)}>
            {status}
          </Badge>
        )
      },
    },
    {
      id: 'actions',
      header: '선택',
      cell: ({ row }) => (
        <Button
          variant="ghost"
          size="sm"
          onClick={() => handleVendorSelect(row.original)}
        >
          <Check className="h-4 w-4" />
        </Button>
      ),
    },
  ]

  const table = useReactTable({
    data: vendors,
    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,
    },
  })

  const loadVendors = async () => {
    setLoading(true)
    try {
      const result = await getVendors()
      if (result.success) {
        setVendors(result.data)
      } else {
        toast.error(result.error)
      }
    } catch (error) {
      toast.error('벤더를 불러오는 중 오류가 발생했습니다.')
    } finally {
      setLoading(false)
    }
  }

  const handleVendorSelect = (vendor: Vendor) => {
    onVendorSelect(vendor)
    setOpen(false)
  }

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

  return (
    <Dialog open={open} onOpenChange={setOpen}>
      <DialogTrigger asChild>
        <Button variant="outline" disabled={disabled} className="w-full justify-start">
          {selectedVendor ? (
            <div className="flex items-center gap-2">
              <span className="truncate">{selectedVendor.vendorName}</span>
              {selectedVendor.vendorCode && (
                <span className="font-mono text-sm text-muted-foreground">
                  ({selectedVendor.vendorCode})
                </span>
              )}
            </div>
          ) : (
            <span className="text-muted-foreground">벤더를 선택하세요</span>
          )}
        </Button>
      </DialogTrigger>
      <DialogContent className="max-w-4xl max-h-[80vh]">
        <DialogHeader>
          <DialogTitle>벤더 선택</DialogTitle>
        </DialogHeader>
        
        <div className="space-y-4">
          <div className="flex items-center space-x-2">
            <Search className="h-4 w-4" />
            <Input
              placeholder="벤더명, 벤더 코드로 검색..."
              value={globalFilter}
              onChange={(e) => setGlobalFilter(e.target.value)}
              className="flex-1"
            />
          </div>

          {loading ? (
            <div className="flex justify-center py-8">
              <div className="text-sm text-muted-foreground">벤더를 불러오는 중...</div>
            </div>
          ) : (
            <div className="border rounded-md">
              <Table>
                <TableHeader>
                  {table.getHeaderGroups().map((headerGroup) => (
                    <TableRow key={headerGroup.id}>
                      {headerGroup.headers.map((header) => (
                        <TableHead key={header.id}>
                          {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={() => handleVendorSelect(row.original)}
                      >
                        {row.getVisibleCells().map((cell) => (
                          <TableCell key={cell.id}>
                            {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 벤더
            </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>
      </DialogContent>
    </Dialog>
  )
}