'use client'

/**
 * 통화 단일 선택 다이얼로그
 * 
 * @description
 * - 통화를 하나만 선택할 수 있는 다이얼로그
 * - 트리거 버튼과 다이얼로그가 분리된 구조
 * - 외부에서 open 상태를 제어 가능
 */

import { useState, useCallback, useMemo, useTransition, useEffect } from 'react'
import { Button } from '@/components/ui/button'
import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogFooter } from '@/components/ui/dialog'
import { Input } from '@/components/ui/input'
import { Search, Check, X } 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 { 
  getCurrencies, 
  Currency
} from './currency-service'
import { toast } from 'sonner'

export interface CurrencySelectorSingleDialogProps {
  open: boolean
  onOpenChange: (open: boolean) => void
  selectedCurrency?: Currency
  onCurrencySelect: (currency: Currency) => void
  onConfirm?: (currency: Currency | undefined) => void
  onCancel?: () => void
  title?: string
  description?: string
  showConfirmButtons?: boolean
}

export function CurrencySelectorSingleDialog({ 
  open,
  onOpenChange,
  selectedCurrency, 
  onCurrencySelect, 
  onConfirm,
  onCancel,
  title = "통화 선택",
  description = "통화를 선택하세요",
  showConfirmButtons = false
}: CurrencySelectorSingleDialogProps) {
  const [currencies, setCurrencies] = useState<Currency[]>([])
  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 [isPending, startTransition] = useTransition()
  const [tempSelectedCurrency, setTempSelectedCurrency] = useState<Currency | undefined>(selectedCurrency)

  // 통화 선택 핸들러
  const handleCurrencySelect = useCallback((currency: Currency) => {
    if (showConfirmButtons) {
      setTempSelectedCurrency(currency)
    } else {
      onCurrencySelect(currency)
      onOpenChange(false)
    }
  }, [onCurrencySelect, onOpenChange, showConfirmButtons])

  // 확인 버튼 핸들러
  const handleConfirm = useCallback(() => {
    if (tempSelectedCurrency) {
      onCurrencySelect(tempSelectedCurrency)
    }
    onConfirm?.(tempSelectedCurrency)
    onOpenChange(false)
  }, [tempSelectedCurrency, onCurrencySelect, onConfirm, onOpenChange])

  // 취소 버튼 핸들러
  const handleCancel = useCallback(() => {
    setTempSelectedCurrency(selectedCurrency)
    onCancel?.()
    onOpenChange(false)
  }, [selectedCurrency, onCancel, onOpenChange])

  // 테이블 컬럼 정의
  const columns: ColumnDef<Currency>[] = useMemo(() => [
    {
      accessorKey: 'CURRENCY_CODE',
      header: '통화코드',
      cell: ({ row }) => (
        <div className="font-mono text-sm font-semibold">{row.getValue('CURRENCY_CODE')}</div>
      ),
    },
    {
      accessorKey: 'CURRENCY_NAME',
      header: '통화명',
      cell: ({ row }) => (
        <div>{row.getValue('CURRENCY_NAME')}</div>
      ),
    },
    {
      accessorKey: 'DECIMAL_PLACES',
      header: '소수점',
      cell: ({ row }) => (
        <div className="text-center text-sm text-muted-foreground">
          {row.getValue('DECIMAL_PLACES')}자리
        </div>
      ),
    },
    {
      id: 'actions',
      header: '선택',
      cell: ({ row }) => {
        const isSelected = showConfirmButtons 
          ? tempSelectedCurrency?.CURRENCY_CODE === row.original.CURRENCY_CODE
          : selectedCurrency?.CURRENCY_CODE === row.original.CURRENCY_CODE
        
        return (
          <Button
            variant={isSelected ? "default" : "ghost"}
            size="sm"
            onClick={(e) => {
              e.stopPropagation()
              handleCurrencySelect(row.original)
            }}
          >
            <Check className="h-4 w-4" />
          </Button>
        )
      },
    },
  ], [handleCurrencySelect, selectedCurrency, tempSelectedCurrency, showConfirmButtons])

  // 통화 테이블 설정
  const table = useReactTable({
    data: currencies,
    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,
    },
  })

  // 서버에서 통화 전체 목록 로드 (한 번만)
  const loadCurrencies = useCallback(async () => {
    startTransition(async () => {
      try {
        const result = await getCurrencies()
        
        if (result.success) {
          setCurrencies(result.data)
          
          // 폴백 데이터를 사용하는 경우 알림
          if (result.isUsingFallback) {
            toast.info('Oracle 연결 실패', {
              description: '테스트 데이터를 사용합니다.',
              duration: 4000,
            })
          }
        } else {
          toast.error(result.error || '통화 목록을 불러오는데 실패했습니다.')
          setCurrencies([])
        }
      } catch (error) {
        console.error('통화 목록 로드 실패:', error)
        toast.error('통화 목록을 불러오는 중 오류가 발생했습니다.')
        setCurrencies([])
      }
    })
  }, [])

  // 다이얼로그 열릴 때 통화 로드 (open prop 변화 감지)
  useEffect(() => {
    if (open) {
      setTempSelectedCurrency(selectedCurrency)
      if (currencies.length === 0) {
        console.log('🚀 [CurrencySelectorSingleDialog] 다이얼로그 열림 - loadCurrencies 호출')
        loadCurrencies()
      } else {
        console.log('📦 [CurrencySelectorSingleDialog] 다이얼로그 열림 - 기존 데이터 사용 (' + currencies.length + '건)')
      }
    }
  }, [open, selectedCurrency, loadCurrencies, currencies.length])

  // 검색어 변경 핸들러 (클라이언트 사이드 필터링)
  const handleSearchChange = useCallback((value: string) => {
    setGlobalFilter(value)
  }, [])

  const currentSelectedCurrency = showConfirmButtons ? tempSelectedCurrency : selectedCurrency

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="max-w-4xl max-h-[80vh]">
        <DialogHeader>
          <DialogTitle>{title}</DialogTitle>
          <div className="text-sm text-muted-foreground">
            {description}
          </div>
        </DialogHeader>
        
        <div className="space-y-4">
          {/* 현재 선택된 통화 표시 */}
          {currentSelectedCurrency && (
            <div className="p-3 bg-muted rounded-md">
              <div className="text-sm font-medium">선택된 통화:</div>
              <div className="flex items-center gap-2 mt-1">
                <span className="font-mono text-sm font-semibold">[{currentSelectedCurrency.CURRENCY_CODE}]</span>
                <span>{currentSelectedCurrency.CURRENCY_NAME}</span>
                <span className="text-xs text-muted-foreground">
                  (소수점 {currentSelectedCurrency.DECIMAL_PLACES}자리)
                </span>
              </div>
            </div>
          )}

          <div className="flex items-center space-x-2">
            <Search className="h-4 w-4" />
            <Input
              placeholder="통화 코드 또는 이름으로 검색..."
              value={globalFilter}
              onChange={(e) => handleSearchChange(e.target.value)}
              className="flex-1"
            />
          </div>

          {isPending ? (
            <div className="flex justify-center py-8">
              <div className="text-sm text-muted-foreground">통화 목록을 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) => {
                      const isRowSelected = currentSelectedCurrency?.CURRENCY_CODE === row.original.CURRENCY_CODE
                      return (
                        <TableRow
                          key={row.id}
                          data-state={isRowSelected && "selected"}
                          className={`cursor-pointer hover:bg-muted/50 ${
                            isRowSelected ? 'bg-muted' : ''
                          }`}
                          onClick={() => handleCurrencySelect(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 통화
            </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>

        {showConfirmButtons && (
          <DialogFooter>
            <Button variant="outline" onClick={handleCancel}>
              <X className="h-4 w-4 mr-2" />
              취소
            </Button>
            <Button onClick={handleConfirm} disabled={!tempSelectedCurrency}>
              <Check className="h-4 w-4 mr-2" />
              확인
            </Button>
          </DialogFooter>
        )}
      </DialogContent>
    </Dialog>
  )
}

