"use client"

import * as React from "react"
import { toast } from "sonner"
import { ArrowUpDown, CheckSquare, Plus, Search, Square, X, Loader2 } from "lucide-react"
import { Input } from "@/components/ui/input"
import { Calendar } from "@/components/ui/calendar"
import { Popover, PopoverContent, PopoverTrigger } from "@/components/ui/popover"
import { CalendarIcon } from "lucide-react"
import { format } from "date-fns"
import { ko } from "date-fns/locale"

import { Button } from "@/components/ui/button"
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
  DialogTrigger,
} from "@/components/ui/dialog"
import {
  Form,
  FormControl,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
  FormDescription,
} from "@/components/ui/form"
import { zodResolver } from "@hookform/resolvers/zod"
import { useForm } from "react-hook-form"
import * as z from "zod"
import { EstimateProjectSelector } from "@/components/BidProjectSelector"
import { type Project } from "@/lib/rfqs/service"
import { createTechSalesRfq } from "@/lib/techsales-rfq/service"
import { useSession } from "next-auth/react"
import { Separator } from "@/components/ui/separator"
import { Badge } from "@/components/ui/badge"
import {
  DropdownMenu,
  DropdownMenuCheckboxItem,
  DropdownMenuContent,
  DropdownMenuTrigger,
} from "@/components/ui/dropdown-menu"
import { cn } from "@/lib/utils"
import { ScrollArea } from "@/components/ui/scroll-area"

// 실제 데이터 서비스 import
import { 
  getShipbuildingItemsByWorkType, 
  searchShipbuildingItems, 
  getWorkTypes,
  type ShipbuildingItem,
  type WorkType 
} from "@/lib/items-tech/service"

// 유효성 검증 스키마 - 자재코드(item_code) 배열로 변경
const createRfqSchema = z.object({
  biddingProjectId: z.number({
    required_error: "프로젝트를 선택해주세요.",
  }),
  materialCodes: z.array(z.string()).min(1, {
    message: "적어도 하나의 자재코드를 선택해야 합니다.",
  }),
  dueDate: z.date({
    required_error: "마감일을 선택해주세요.",
  }),
})

// 폼 데이터 타입
type CreateRfqFormValues = z.infer<typeof createRfqSchema>

// 공종 타입 정의
interface WorkTypeOption {
  code: WorkType
  name: string
  description: string
}

interface CreateRfqDialogProps {
  onCreated?: () => void;
}

export function CreateRfqDialog({ onCreated }: CreateRfqDialogProps) {
  const { data: session } = useSession()
  const [isProcessing, setIsProcessing] = React.useState(false)
  const [isDialogOpen, setIsDialogOpen] = React.useState(false)
  const [selectedProject, setSelectedProject] = React.useState<Project | null>(null)
  
  // 검색 및 필터링 상태
  const [itemSearchQuery, setItemSearchQuery] = React.useState("")
  const [selectedWorkType, setSelectedWorkType] = React.useState<WorkType | null>(null)
  const [selectedItems, setSelectedItems] = React.useState<ShipbuildingItem[]>([])
  const [isSearchingItems, setIsSearchingItems] = React.useState(false)
  
  // 데이터 상태
  const [workTypes, setWorkTypes] = React.useState<WorkTypeOption[]>([])
  const [availableItems, setAvailableItems] = React.useState<ShipbuildingItem[]>([])
  const [isLoadingItems, setIsLoadingItems] = React.useState(false)

  // RFQ 생성 폼
  const form = useForm<CreateRfqFormValues>({
    resolver: zodResolver(createRfqSchema),
    defaultValues: {
      biddingProjectId: undefined,
      materialCodes: [],
      dueDate: new Date(Date.now() + 14 * 24 * 60 * 60 * 1000), // 14일 후
    }
  })

  // 공종 목록 로드
  React.useEffect(() => {
    const loadWorkTypes = async () => {
      const types = await getWorkTypes()
      setWorkTypes(types)
    }
    loadWorkTypes()
  }, [])

  // 아이템 데이터 로드
  const loadItems = React.useCallback(async () => {
    setIsLoadingItems(true)
    try {
      let result
      if (itemSearchQuery.trim()) {
        result = await searchShipbuildingItems(itemSearchQuery, selectedWorkType || undefined)
      } else {
        result = await getShipbuildingItemsByWorkType(selectedWorkType || undefined)
      }
      
      if (result.error) {
        toast.error(`아이템 로드 오류: ${result.error}`)
        setAvailableItems([])
      } else {
        setAvailableItems(result.data || [])
      }
    } catch (error) {
      console.error("아이템 로드 오류:", error)
      toast.error("아이템을 불러오는 중 오류가 발생했습니다")
      setAvailableItems([])
    } finally {
      setIsLoadingItems(false)
    }
  }, [itemSearchQuery, selectedWorkType])

  // 아이템 검색 디바운스
  React.useEffect(() => {
    setIsSearchingItems(true)
    const timer = setTimeout(() => {
      loadItems()
      setIsSearchingItems(false)
    }, 300)

    return () => clearTimeout(timer)
  }, [loadItems])

  // 프로젝트 선택 처리
  const handleProjectSelect = (project: Project) => {
    setSelectedProject(project)
    form.setValue("biddingProjectId", project.id)
    // 선택 초기화
    setSelectedItems([])
    form.setValue("materialCodes", [])
  }

  // 아이템 선택/해제 처리
  const handleItemToggle = (item: ShipbuildingItem) => {
    const isSelected = selectedItems.some(selected => selected.id === item.id)
    
    if (isSelected) {
      // 아이템 선택 해제
      const newSelectedItems = selectedItems.filter(selected => selected.id !== item.id)
      setSelectedItems(newSelectedItems)
      form.setValue("materialCodes", newSelectedItems.map(item => item.itemCode))
    } else {
      // 아이템 선택 추가
      const newSelectedItems = [...selectedItems, item]
      setSelectedItems(newSelectedItems)
      form.setValue("materialCodes", newSelectedItems.map(item => item.itemCode))
    }
  }

  // 아이템 제거 처리
  const handleRemoveItem = (itemId: number) => {
    const newSelectedItems = selectedItems.filter(item => item.id !== itemId)
    setSelectedItems(newSelectedItems)
    form.setValue("materialCodes", newSelectedItems.map(item => item.itemCode))
  }

  // RFQ 생성 함수
  const handleCreateRfq = async (data: CreateRfqFormValues) => {
    try {
      setIsProcessing(true)
      
      // 사용자 인증 확인
      if (!session?.user?.id) {
        throw new Error("로그인이 필요합니다")
      }

      // 선택된 아이템들을 아이템명(itemList)으로 그룹핑
      const groupedItems = selectedItems.reduce((groups, item) => {
        const actualItemName = item.itemList // 실제 조선 아이템명
        if (!actualItemName) {
          throw new Error(`아이템 "${item.itemCode}"의 아이템명(itemList)이 없습니다.`)
        }
        if (!groups[actualItemName]) {
          groups[actualItemName] = []
        }
        groups[actualItemName].push(item)
        return groups
      }, {} as Record<string, typeof selectedItems>)

      const rfqGroups = Object.entries(groupedItems).map(([actualItemName, items]) => {
        const itemCodes = items.map(item => item.itemCode) // 자재그룹코드들
        const joinedItemCodes = itemCodes.join(',')
        return {
          actualItemName,
          items,
          itemCodes,
          joinedItemCodes,
          codeLength: joinedItemCodes.length,
          isOverLimit: joinedItemCodes.length > 255
        }
      })

      // 255자 초과 그룹 확인
      const overLimitGroups = rfqGroups.filter(group => group.isOverLimit)
      if (overLimitGroups.length > 0) {
        const groupNames = overLimitGroups.map(g => `"${g.actualItemName}" (${g.codeLength}자)`).join(', ')
        throw new Error(`다음 아이템 그룹의 자재코드가 255자를 초과합니다: ${groupNames}`)
      }

      // 각 그룹별로 RFQ 생성
      const createPromises = rfqGroups.map(group => 
        createTechSalesRfq({
          biddingProjectId: data.biddingProjectId,
          materialGroupCodes: [group.joinedItemCodes], // 그룹화된 자재코드들
          createdBy: Number(session.user.id),
          dueDate: data.dueDate,
        })
      )

      const results = await Promise.all(createPromises)
      
      // 오류 확인
      const errors = results.filter(result => result.error)
      if (errors.length > 0) {
        throw new Error(errors.map(e => e.error).join(', '))
      }
      
      // 성공적으로 생성되면 다이얼로그 닫기 및 메시지 표시
      const totalRfqs = results.reduce((sum, result) => sum + (result.data?.length || 0), 0)
      toast.success(`${rfqGroups.length}개 아이템 그룹으로 총 ${totalRfqs}개의 RFQ가 성공적으로 생성되었습니다`)
      setIsDialogOpen(false)
      form.reset({
        biddingProjectId: undefined,
        materialCodes: [],
        dueDate: new Date(Date.now() + 14 * 24 * 60 * 60 * 1000), // 14일 후로 재설정
      })
      setSelectedProject(null)
      setItemSearchQuery("")
      setSelectedWorkType(null)
      setSelectedItems([])
      setAvailableItems([])
      
      // 생성 후 콜백 실행
      if (onCreated) {
        onCreated()
      }
      
    } catch (error) {
      console.error("RFQ 생성 오류:", error)
      toast.error(`RFQ 생성 중 오류가 발생했습니다: ${error instanceof Error ? error.message : '알 수 없는 오류'}`)
    } finally {
      setIsProcessing(false)
    }
  }

  return (
    <Dialog 
      open={isDialogOpen}
      onOpenChange={(open) => {
        setIsDialogOpen(open)
        if (!open) {
          form.reset({
            biddingProjectId: undefined,
            materialCodes: [],
            dueDate: new Date(Date.now() + 14 * 24 * 60 * 60 * 1000), // 14일 후로 재설정
          })
          setSelectedProject(null)
          setItemSearchQuery("")
          setSelectedWorkType(null)
          setSelectedItems([])
          setAvailableItems([])
        }
      }}
    >
      <DialogTrigger asChild>
        <Button
          variant="default"
          size="sm"
          className="gap-2"
          disabled={isProcessing}
        >
          <Plus className="size-4" aria-hidden="true" />
          <span className="hidden sm:inline">RFQ 생성</span>
        </Button>
      </DialogTrigger>
      <DialogContent className="max-w-4xl w-[90vw] h-[90vh] overflow-hidden flex flex-col">
        <DialogHeader>
          <DialogTitle>RFQ 생성</DialogTitle>
        </DialogHeader>
        
        <div className="flex-1 overflow-y-auto">
          <Form {...form}>
            <form onSubmit={form.handleSubmit(handleCreateRfq)} className="space-y-4">
              {/* 프로젝트 선택 */}
              <FormField
                control={form.control}
                name="biddingProjectId"
                render={({ field }) => (
                  <FormItem>
                    <FormLabel>입찰 프로젝트</FormLabel>
                    <FormControl>
                      <EstimateProjectSelector
                        selectedProjectId={field.value}
                        onProjectSelect={handleProjectSelect}
                        placeholder="입찰 프로젝트를 선택하세요"
                      />
                    </FormControl>
                    <FormMessage />
                  </FormItem>
                )}
              />
              
              <Separator className="my-4" />
              
              {/* 마감일 설정 */}
              <FormField
                control={form.control}
                name="dueDate"
                render={({ field }) => (
                  <FormItem className="flex flex-col">
                    <FormLabel>마감일</FormLabel>
                    <Popover>
                      <PopoverTrigger asChild>
                        <FormControl>
                          <Button
                            variant="outline"
                            className={cn(
                              "w-full pl-3 text-left font-normal",
                              !field.value && "text-muted-foreground"
                            )}
                          >
                            {field.value ? (
                              format(field.value, "PPP", { locale: ko })
                            ) : (
                              <span>마감일을 선택하세요</span>
                            )}
                            <CalendarIcon className="ml-auto h-4 w-4 opacity-50" />
                          </Button>
                        </FormControl>
                      </PopoverTrigger>
                      <PopoverContent className="w-auto p-0" align="start">
                        <Calendar
                          mode="single"
                          selected={field.value}
                          onSelect={field.onChange}
                          disabled={(date) =>
                            date < new Date() || date < new Date("1900-01-01")
                          }
                          initialFocus
                        />
                      </PopoverContent>
                    </Popover>
                    <FormDescription>
                      벤더가 견적을 제출해야 하는 마감일입니다.
                    </FormDescription>
                    <FormMessage />
                  </FormItem>
                )}
              />
              
              <Separator className="my-4" />
              
              {!selectedProject ? (
                <div className="text-sm text-muted-foreground italic text-center py-8">
                  먼저 프로젝트를 선택해주세요
                </div>
              ) : (
                <div className="space-y-6">
                  {/* 아이템 선택 영역 */}
                  <div className="space-y-4">
                    <div>
                      <FormLabel>조선 아이템 선택</FormLabel>
                      <FormDescription>
                        공종별 아이템을 선택하세요
                      </FormDescription>
                    </div>
                    
                    {/* 아이템 검색 및 필터 */}
                    <div className="space-y-2">
                      <div className="flex space-x-2">
                        <div className="relative flex-1">
                          <Search className="absolute left-2 top-1/2 -translate-y-1/2 h-4 w-4 text-muted-foreground" />
                          <Input
                            placeholder="아이템 검색..."
                            value={itemSearchQuery}
                            onChange={(e) => setItemSearchQuery(e.target.value)}
                            className="pl-8 pr-8"
                          />
                          {itemSearchQuery && (
                            <Button
                              variant="ghost"
                              size="sm"
                              className="absolute right-0 top-0 h-full px-3"
                              onClick={() => setItemSearchQuery("")}
                            >
                              <X className="h-4 w-4" />
                            </Button>
                          )}
                          {isSearchingItems && (
                            <Loader2 className="absolute right-8 top-2.5 h-4 w-4 animate-spin text-muted-foreground" />
                          )}
                        </div>
                        
                        {/* 공종 필터 */}
                        <DropdownMenu>
                          <DropdownMenuTrigger asChild>
                            <Button variant="outline" className="gap-1">
                              {selectedWorkType ? workTypes.find(wt => wt.code === selectedWorkType)?.name : "전체 공종"}
                              <ArrowUpDown className="ml-2 h-4 w-4 opacity-50" />
                            </Button>
                          </DropdownMenuTrigger>
                          <DropdownMenuContent align="end">
                            <DropdownMenuCheckboxItem
                              checked={selectedWorkType === null}
                              onCheckedChange={() => setSelectedWorkType(null)}
                            >
                              전체 공종
                            </DropdownMenuCheckboxItem>
                            {workTypes.map(workType => (
                              <DropdownMenuCheckboxItem
                                key={workType.code}
                                checked={selectedWorkType === workType.code}
                                onCheckedChange={() => setSelectedWorkType(workType.code)}
                              >
                                {workType.name}
                              </DropdownMenuCheckboxItem>
                            ))}
                          </DropdownMenuContent>
                        </DropdownMenu>
                      </div>
                    </div>
                      
                    {/* 아이템 목록 */}
                    <div className="border rounded-md">
                      <ScrollArea className="h-[300px]">
                        <div className="p-2 space-y-1">
                          {isLoadingItems ? (
                            <div className="text-center py-8 text-muted-foreground">
                              <Loader2 className="h-6 w-6 animate-spin mx-auto mb-2" />
                              아이템을 불러오는 중...
                            </div>
                          ) : availableItems.length > 0 ? (
                            [...availableItems]
                              .sort((a, b) => {
                                // itemList 기준으로 정렬 (없는 경우 itemName 사용, 둘 다 없으면 맨 뒤로)
                                const aName = a.itemList || a.itemName || 'zzz'
                                const bName = b.itemList || b.itemName || 'zzz'
                                return aName.localeCompare(bName, 'ko', { numeric: true })
                              })
                              .map((item) => {
                                const isSelected = selectedItems.some(selected => selected.id === item.id)
                                return (
                                  <div
                                    key={item.id}
                                    className={cn(
                                      "flex items-center space-x-2 p-2 rounded-md cursor-pointer hover:bg-muted",
                                      isSelected && "bg-muted"
                                    )}
                                    onClick={() => handleItemToggle(item)}
                                  >
                                    <div className="flex items-center space-x-2 flex-1">
                                      {isSelected ? (
                                        <CheckSquare className="h-4 w-4" />
                                      ) : (
                                        <Square className="h-4 w-4" />
                                      )}
                                      <div className="flex-1">
                                        <div className="font-medium">
                                          {item.itemList || item.itemName || '아이템명 없음'}
                                        </div>
                                        <div className="text-sm text-muted-foreground">
                                          {item.itemCode} • {item.description || '설명 없음'}
                                        </div>
                                        <div className="text-xs text-muted-foreground">
                                          공종: {item.workType} • 선종: {item.shipTypes}
                                        </div>
                                      </div>
                                    </div>
                                  </div>
                                )
                              })
                          ) : (
                            <div className="text-center py-8 text-muted-foreground">
                              {itemSearchQuery ? "검색 결과가 없습니다" : "아이템이 없습니다"}
                            </div>
                          )}
                        </div>
                      </ScrollArea>
                    </div>
                    
                    {/* 선택된 아이템 목록 */}
                    <FormField
                      control={form.control}
                      name="materialCodes"
                      render={() => (
                        <FormItem>
                          <FormLabel>선택된 아이템 ({selectedItems.length}개)</FormLabel>
                          <div className="min-h-[80px] p-3 border rounded-md bg-muted/50">
                            {selectedItems.length > 0 ? (
                              <div className="flex flex-wrap gap-2">
                                {selectedItems.map((item) => (
                                  <Badge
                                    key={item.id}
                                    variant="secondary"
                                    className="flex items-center gap-1"
                                  >
                                    {item.itemList || item.itemName || '아이템명 없음'} ({item.itemCode})
                                    <X
                                      className="h-3 w-3 cursor-pointer hover:text-destructive"
                                      onClick={() => handleRemoveItem(item.id)}
                                    />
                                  </Badge>
                                ))}
                              </div>
                            ) : (
                              <div className="flex items-center justify-center h-full text-sm text-muted-foreground">
                                선택된 아이템이 없습니다
                              </div>
                            )}
                          </div>
                          <FormMessage />
                        </FormItem>
                      )}
                    />

                    {/* RFQ 그룹핑 미리보기 */}
                    {selectedItems.length > 0 && (
                      <div className="space-y-3">
                        <FormLabel>생성될 RFQ 그룹 미리보기</FormLabel>
                        <div className="border rounded-md p-3 bg-background">
                          {(() => {
                            // 아이템명(itemList)으로 그룹핑
                            const groupedItems = selectedItems.reduce((groups, item) => {
                              const actualItemName = item.itemList // 실제 조선 아이템명
                              if (!actualItemName) {
                                return groups // itemList가 없는 경우 제외
                              }
                              if (!groups[actualItemName]) {
                                groups[actualItemName] = []
                              }
                              groups[actualItemName].push(item)
                              return groups
                            }, {} as Record<string, typeof selectedItems>)

                            const rfqGroups = Object.entries(groupedItems).map(([actualItemName, items]) => {
                              const itemCodes = items.map(item => item.itemCode) // 자재그룹코드들
                              const joinedItemCodes = itemCodes.join(',')
                              return {
                                actualItemName,
                                items,
                                itemCodes,
                                joinedItemCodes,
                                codeLength: joinedItemCodes.length,
                                isOverLimit: joinedItemCodes.length > 255
                              }
                            })

                            return (
                              <div className="space-y-3">
                                <div className="text-sm text-muted-foreground">
                                  총 {rfqGroups.length}개의 RFQ가 생성됩니다 (아이템명별로 그룹핑)
                                </div>
                                {rfqGroups.map((group, index) => (
                                  <div 
                                    key={group.actualItemName}
                                    className={cn(
                                      "p-3 border rounded-md space-y-2",
                                      group.isOverLimit && "border-destructive bg-destructive/5"
                                    )}
                                  >
                                    <div className="flex items-center justify-between">
                                      <div className="font-medium">
                                        RFQ #{index + 1}: {group.actualItemName}
                                      </div>
                                      <Badge variant={group.isOverLimit ? "destructive" : "secondary"}>
                                        {group.itemCodes.length}개 자재코드 ({group.codeLength}/255자)
                                      </Badge>
                                    </div>
                                    <div className="text-sm text-muted-foreground">
                                      자재코드: {group.joinedItemCodes}
                                    </div>
                                    {group.isOverLimit && (
                                      <div className="text-sm text-destructive">
                                        ⚠️ 자재코드 길이가 255자를 초과합니다. 일부 아이템을 제거해주세요.
                                      </div>
                                    )}
                                    <div className="text-xs text-muted-foreground">
                                      포함된 아이템: {group.items.map(item => `${item.itemCode}`).join(', ')}
                                    </div>
                                  </div>
                                ))}
                              </div>
                            )
                          })()}
                        </div>
                      </div>
                    )}
                  </div>
                </div>
              )}
              
              {/* 안내 메시지 */}
              {/* {selectedProject && (
                <div className="text-sm text-muted-foreground bg-muted p-3 rounded-md">
                  <p>• 공종별 조선 아이템을 선택하세요.</p>
                  <p>• <strong>같은 아이템명의 다른 자재코드들은 하나의 RFQ로 그룹핑됩니다.</strong></p>
                  <p>• 그룹핑된 자재코드들은 comma로 구분되어 저장됩니다.</p>
                  <p>• 자재코드 길이는 최대 255자까지 가능합니다.</p>
                  <p>• 마감일은 벤더가 견적을 제출해야 하는 날짜입니다.</p>
                </div>
              )} */}
               
              <div className="flex justify-end space-x-2 pt-4">
                <Button
                  type="button"
                  variant="outline"
                  onClick={() => setIsDialogOpen(false)}
                  disabled={isProcessing}
                >
                  취소
                </Button>
                <Button 
                  type="submit" 
                  disabled={
                    isProcessing || 
                    !selectedProject || 
                    selectedItems.length === 0 ||
                    // 255자 초과 그룹이 있는지 확인
                    (() => {
                      const groupedItems = selectedItems.reduce((groups, item) => {
                        const actualItemName = item.itemList // 실제 조선 아이템명
                        if (!actualItemName) {
                          return groups // itemList가 없는 경우 제외
                        }
                        if (!groups[actualItemName]) {
                          groups[actualItemName] = []
                        }
                        groups[actualItemName].push(item.itemCode)
                        return groups
                      }, {} as Record<string, string[]>)
                      
                      return Object.values(groupedItems).some(itemCodes => itemCodes.join(',').length > 255)
                    })()
                  }
                >
                  {isProcessing ? "처리 중..." : (() => {
                    const groupedItems = selectedItems.reduce((groups, item) => {
                      const actualItemName = item.itemList // 실제 조선 아이템명
                      if (!actualItemName) {
                        return groups // itemList가 없는 경우 제외
                      }
                      if (!groups[actualItemName]) {
                        groups[actualItemName] = []
                      }
                      groups[actualItemName].push(item.itemCode)
                      return groups
                    }, {} as Record<string, string[]>)
                    
                    const groupCount = Object.keys(groupedItems).length
                    return `${groupCount}개 아이템 그룹으로 생성하기`
                  })()}
                </Button>
              </div>
            </form>
          </Form>
        </div>
      </DialogContent>
    </Dialog>
  )
}