'use client'

import { useState, useEffect, useCallback, useMemo } 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 { searchUnifiedProjects, UnifiedProject, ProjectSearchOptions } from './project-service'
import { toast } from 'sonner'

export interface UnifiedProjectSelectorProps {
  selectedProject?: UnifiedProject
  onProjectSelect: (project: UnifiedProject) => void
  disabled?: boolean
  searchOptions?: Partial<ProjectSearchOptions>
  placeholder?: string
  className?: string
}

export function UnifiedProjectSelector({ 
  selectedProject, 
  onProjectSelect, 
  disabled,
  searchOptions = {},
  placeholder = "프로젝트를 선택하세요",
  className
}: UnifiedProjectSelectorProps) {
  const [open, setOpen] = useState(false)
  const [projects, setProjects] = useState<UnifiedProject[]>([])
  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('')

  // 기본 검색 옵션 설정
  const finalSearchOptions: ProjectSearchOptions = useMemo(() => ({
    searchFrom: 'both',
    limit: 100,
    ...searchOptions
  }), [searchOptions])

  // 테이블 컬럼 정의
  const columns: ColumnDef<UnifiedProject>[] = useMemo(() => [
    {
      accessorKey: 'code',
      header: '프로젝트 코드',
      cell: ({ row }) => (
        <div className="font-mono text-sm">{row.getValue('code')}</div>
      ),
    },
    {
      accessorKey: 'name',
      header: '프로젝트명',
      cell: ({ row }) => (
        <div className="max-w-[200px] truncate">{row.getValue('name')}</div>
      ),
    },
    {
      accessorKey: 'type',
      header: '타입',
      cell: ({ row }) => (
        <Badge variant="outline">{row.getValue('type')}</Badge>
      ),
    },
    {
      accessorKey: 'source',
      header: '출처',
      cell: ({ row }) => {
        const source = row.getValue('source') as string
        return (
          <Badge variant={source === 'projects' ? 'default' : 'secondary'}>
            {source === 'projects' ? '프로젝트' : '견적프로젝트'}
          </Badge>
        )
      },
    },
    {
      id: 'actions',
      header: '선택',
      cell: ({ row }) => (
        <Button
          variant="ghost"
          size="sm"
          onClick={(e) => {
            e.stopPropagation()
            handleProjectSelect(row.original)
          }}
        >
          <Check className="h-4 w-4" />
        </Button>
      ),
    },
  ], [])

  // 프로젝트 테이블 설정
  const table = useReactTable({
    data: projects,
    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,
    },
  })

  // 프로젝트 목록 로드
  const loadProjects = useCallback(async (searchTerm?: string) => {
    setLoading(true)
    try {
      const result = await searchUnifiedProjects({
        ...finalSearchOptions,
        searchTerm: searchTerm || globalFilter
      })
      
      if (result.success) {
        setProjects(result.data)
      } else {
        toast.error(result.error || '프로젝트를 불러오는데 실패했습니다.')
        setProjects([])
      }
    } catch (error) {
      console.error('프로젝트 목록 로드 실패:', error)
      toast.error('프로젝트를 불러오는 중 오류가 발생했습니다.')
      setProjects([])
    } finally {
      setLoading(false)
    }
  }, [finalSearchOptions, globalFilter])

  // 프로젝트 선택 핸들러
  const handleProjectSelect = useCallback((project: UnifiedProject) => {
    onProjectSelect(project)
    setOpen(false)
  }, [onProjectSelect])

  // 다이얼로그 열릴 때 프로젝트 목록 로드
  useEffect(() => {
    if (open && projects.length === 0) {
      loadProjects()
    }
  }, [open, projects.length, loadProjects])

  // 검색어 변경 시 디바운스된 검색
  useEffect(() => {
    if (!open) return

    const timeoutId = setTimeout(() => {
      loadProjects(globalFilter)
    }, 300)

    return () => clearTimeout(timeoutId)
  }, [globalFilter, open, loadProjects])

  return (
    <Dialog open={open} onOpenChange={setOpen}>
      <DialogTrigger asChild>
        <Button 
          variant="outline" 
          disabled={disabled} 
          className={`w-full justify-start ${className || ''}`}
        >
          {selectedProject ? (
            <div className="flex items-center gap-2 w-full">
              <span className="font-mono text-sm">[{selectedProject.code}]</span>
              <span className="truncate flex-1 text-left">{selectedProject.name}</span>
              <Badge variant={selectedProject.source === 'projects' ? 'default' : 'secondary'} className="text-xs">
                {selectedProject.source === 'projects' ? 'P' : 'B'}
              </Badge>
            </div>
          ) : (
            <span className="text-muted-foreground">{placeholder}</span>
          )}
        </Button>
      </DialogTrigger>
      <DialogContent className="max-w-4xl max-h-[80vh]">
        <DialogHeader>
          <DialogTitle>프로젝트 선택</DialogTitle>
          <div className="text-sm text-muted-foreground">
            {finalSearchOptions.searchFrom === 'both' && '프로젝트 및 견적프로젝트에서 검색'}
            {finalSearchOptions.searchFrom === 'projects' && '프로젝트에서 검색'}
            {finalSearchOptions.searchFrom === 'biddingProjects' && '견적프로젝트에서 검색'}
          </div>
        </DialogHeader>
        
        <div className="space-y-4">
          <div className="flex items-center space-x-2">
            <Search className="h-4 w-4" />
            <Input
              placeholder="프로젝트 코드, 이름으로 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">프로젝트를 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={() => handleProjectSelect(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 프로젝트
            </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>
  )
}