"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 { createTechSalesTopRfq } from "@/lib/techsales-rfq/service"
import { useSession } from "next-auth/react"
import { Separator } from "@/components/ui/separator"
import {
  DropdownMenu,
  DropdownMenuCheckboxItem,
  DropdownMenuContent,
  DropdownMenuTrigger,
} from "@/components/ui/dropdown-menu"
import { cn } from "@/lib/utils"
import { ScrollArea } from "@/components/ui/scroll-area"

// 공종 타입 import
import { 
  getOffshoreTopWorkTypes,
  getAllOffshoreTopItemsForCache,
  type OffshoreTopWorkType,
  type OffshoreTopTechItem
} from "@/lib/items-tech/service"

// 해양 TOP 아이템 타입 정의 (이미 service에서 import하므로 제거)

// 유효성 검증 스키마
const createTopRfqSchema = z.object({
  biddingProjectId: z.number({
    required_error: "프로젝트를 선택해주세요.",
  }),
  itemIds: z.array(z.number()).min(1, {
    message: "적어도 하나의 아이템을 선택해야 합니다.",
  }),
  dueDate: z.date({
    required_error: "마감일을 선택해주세요.",
  }),
  description: z.string().optional(),
})

// 폼 데이터 타입
type CreateTopRfqFormValues = z.infer<typeof createTopRfqSchema>

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

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

export function CreateTopRfqDialog({ onCreated }: CreateTopRfqDialogProps) { 
  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<OffshoreTopWorkType | null>(null)
  const [selectedItems, setSelectedItems] = React.useState<OffshoreTopTechItem[]>([])
  
  // 데이터 상태
  const [workTypes, setWorkTypes] = React.useState<WorkTypeOption[]>([])
  const [allItems, setAllItems] = React.useState<OffshoreTopTechItem[]>([])
  const [isLoadingItems, setIsLoadingItems] = React.useState(false)
  const [dataLoadError, setDataLoadError] = React.useState<string | null>(null)
  const [retryCount, setRetryCount] = React.useState(0)

  // 데이터 로딩 함수
  const loadData = React.useCallback(async (isRetry = false) => {
    try {
      if (!isRetry) {
        setIsLoadingItems(true)
        setDataLoadError(null)
      }
      
      console.log(`해양 TOP RFQ 데이터 로딩 시작... ${isRetry ? `(재시도 ${retryCount + 1}회)` : ''}`)
      
      const [workTypesResult, topItemsResult] = await Promise.all([
        getOffshoreTopWorkTypes(),
        getAllOffshoreTopItemsForCache()
      ])
      
      console.log("TOP - WorkTypes 결과:", workTypesResult)
      console.log("TOP - Items 결과:", topItemsResult)
      
      // WorkTypes 설정
      if (Array.isArray(workTypesResult)) {
        setWorkTypes(workTypesResult)
      } else {
        throw new Error("공종 데이터를 불러올 수 없습니다.")
      }
      
      // TOP Items 설정
      if (topItemsResult.data && Array.isArray(topItemsResult.data)) {
        setAllItems(topItemsResult.data as OffshoreTopTechItem[])
        console.log("TOP 아이템 설정 완료:", topItemsResult.data.length, "개")
      } else {
        throw new Error("TOP 아이템 데이터를 불러올 수 없습니다.")
      }
      
      // 성공 시 재시도 카운터 리셋
      setRetryCount(0)
      setDataLoadError(null)
      console.log("해양 TOP RFQ 데이터 로딩 완료")
      
    } catch (error) {
      const errorMessage = error instanceof Error ? error.message : '알 수 없는 오류가 발생했습니다.'
      console.error("해양 TOP RFQ 데이터 로딩 오류:", errorMessage)
      
      setDataLoadError(errorMessage)
      
      // 3회까지 자동 재시도 (500ms 간격)
      if (retryCount < 2) {
        console.log(`${500 * (retryCount + 1)}ms 후 재시도...`)
        setTimeout(() => {
          setRetryCount(prev => prev + 1)
          loadData(true)
        }, 500 * (retryCount + 1))
      } else {
        // 재시도 실패 시 사용자에게 알림
        toast.error(`데이터 로딩에 실패했습니다: ${errorMessage}`)
      }
    } finally {
      if (!isRetry) {
        setIsLoadingItems(false)
      }
    }
  }, [retryCount])

  // 다이얼로그가 열릴 때마다 데이터 로딩
  React.useEffect(() => {
    if (isDialogOpen) {
      setDataLoadError(null)
      setRetryCount(0)
      loadData()
    }
  }, [isDialogOpen, loadData])

  // 수동 새로고침 함수
  const handleRefreshData = React.useCallback(() => {
    setDataLoadError(null)
    setRetryCount(0)
    loadData()
  }, [loadData])

  // RFQ 생성 폼
  const form = useForm<CreateTopRfqFormValues>({
    resolver: zodResolver(createTopRfqSchema),
    defaultValues: {
      biddingProjectId: undefined,
      itemIds: [],
      dueDate: undefined,
      description: "",
    }
  })

  // 필터링된 아이템 목록 가져오기
  const availableItems = React.useMemo(() => {
    let filtered = [...allItems]

    // 공종 필터  
    if (selectedWorkType) {
      filtered = filtered.filter(item => item.workType === selectedWorkType as OffshoreTopTechItem['workType'])
    }

    // 검색어 필터
    if (itemSearchQuery && itemSearchQuery.trim()) {
      const query = itemSearchQuery.toLowerCase().trim()
      filtered = filtered.filter(item => 
        item.itemCode.toLowerCase().includes(query) ||
        (item.itemList && item.itemList.toLowerCase().includes(query)) ||
        (item.subItemList && item.subItemList.toLowerCase().includes(query))
      )
    }

    return filtered
  }, [allItems, itemSearchQuery, selectedWorkType])

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

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

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

      // 해양 TOP RFQ 생성 - 1:N 관계로 한 번에 생성
      const result = await createTechSalesTopRfq({
        biddingProjectId: data.biddingProjectId,
        itemIds: data.itemIds,
        dueDate: data.dueDate,
        description: data.description,
        createdBy: Number(session.user.id),
      })
      
      if (result.error) {
        throw new Error(result.error)
      }
      
      // 성공적으로 생성되면 다이얼로그 닫기 및 메시지 표시
      toast.success(`${selectedItems.length}개 아이템으로 해양 TOP RFQ가 성공적으로 생성되었습니다`)
      
      setIsDialogOpen(false)
      form.reset({
        biddingProjectId: undefined,
        itemIds: [],
        dueDate: undefined,
        description: "",
      })
      setSelectedProject(null)
      setItemSearchQuery("")
      setSelectedWorkType(null)
      setSelectedItems([])
      setDataLoadError(null)
      setRetryCount(0)
      
      // 생성 후 콜백 실행
      if (onCreated) {
        onCreated()
      }
      
    } catch (error) {
      console.error("해양 TOP RFQ 생성 오류:", error)
      toast.error(`해양 TOP 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,
            itemIds: [],
            dueDate: undefined,
            description: "",
          })
          setSelectedProject(null)
          setItemSearchQuery("")
          setSelectedWorkType(null)
          setSelectedItems([])
          setDataLoadError(null)
          setRetryCount(0)
        }
      }}
    >
      <DialogTrigger asChild>
        <Button
          variant="default"
          size="sm"
          className="gap-2"
          disabled={isProcessing}
        >
          <Plus className="size-4" aria-hidden="true" />
          <span className="hidden sm:inline">해양 TOP RFQ 생성</span>
        </Button>
      </DialogTrigger>
      <DialogContent 
        className="max-w-none h-[90vh] overflow-y-auto flex flex-col"
        style={{ width: '1200px' }}
      >
        <DialogHeader className="border-b pb-4">
          <DialogTitle>해양 TOP RFQ 생성</DialogTitle>
        </DialogHeader>
        
        <div className="space-y-6 p-1 overflow-y-auto">
          <Form {...form}>
            <form onSubmit={form.handleSubmit(handleCreateRfq)} className="space-y-6">
              {/* 프로젝트 선택 */}
              <div className="space-y-4">
                <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>
                      <FormMessage />
                    </FormItem>
                  )}
                />
                
                <Separator className="my-4" />
                
                <div className="space-y-6">
                  {/* 아이템 선택 영역 */}
                  <div className="space-y-4">
                    <div>
                      <FormLabel>아이템 선택</FormLabel>
                      <FormDescription>
                        해양 TOP RFQ를 생성하려면 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"
                            disabled={isLoadingItems || dataLoadError !== null}
                          />
                          {itemSearchQuery && (
                            <Button
                              variant="ghost"
                              size="sm"
                              className="absolute right-0 top-0 h-full px-3"
                              onClick={() => setItemSearchQuery("")}
                              disabled={isLoadingItems || dataLoadError !== null}
                            >
                              <X className="h-4 w-4" />
                            </Button>
                          )}
                        </div>
                        
                        {/* 공종 필터 */}
                        <DropdownMenu>
                          <DropdownMenuTrigger asChild>
                            <Button 
                              variant="outline" 
                              className="gap-1"
                              disabled={isLoadingItems || dataLoadError !== null}
                            >
                              {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">
                          {dataLoadError ? (
                            <div className="text-center py-8">
                              <div className="p-4 bg-destructive/10 border border-destructive/20 rounded-md mx-4">
                                <div className="flex flex-col items-center gap-3">
                                  <X className="h-8 w-8 text-destructive" />
                                  <div className="text-center">
                                    <p className="text-sm text-destructive font-medium">데이터 로딩에 실패했습니다</p>
                                    <p className="text-xs text-muted-foreground mt-1">{dataLoadError}</p>
                                  </div>
                                  <Button
                                    variant="outline"
                                    size="sm"
                                    onClick={handleRefreshData}
                                    disabled={isLoadingItems}
                                    className="h-8"
                                  >
                                    {isLoadingItems ? (
                                      <>
                                        <Loader2 className="h-3 w-3 animate-spin mr-1" />
                                        재시도 중...
                                      </>
                                    ) : (
                                      "다시 시도"
                                    )}
                                  </Button>
                                </div>
                              </div>
                            </div>
                          ) : 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...
                              {retryCount > 0 && (
                                <p className="text-xs mt-1">재시도 {retryCount}회</p>
                              )}
                            </div>
                          ) : availableItems.length > 0 ? (
                            [...availableItems]
                              .sort((a, b) => {
                                const aName = a.itemList || 'zzz'
                                const bName = b.itemList || '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 || '아이템명 없음'}
                                          {item.subItemList && ` / ${item.subItemList}`}
                                        </div>
                                        <div className="text-sm text-muted-foreground">
                                          {item.itemCode || '아이템코드 없음'}
                                        </div>
                                        <div className="text-xs text-muted-foreground">
                                          공종: {item.workType}
                                        </div>
                                      </div>
                                    </div>
                                  </div>
                                )
                              })
                          ) : (
                            <div className="text-center py-8 text-muted-foreground">
                              {itemSearchQuery ? "검색 결과가 없습니다" : "아이템이 없습니다"}
                            </div>
                          )}
                        </div>
                      </ScrollArea>
                    </div>
                  </div>
                </div>
              </div>
            </form>
          </Form>
        </div>
        
        {/* Footer - Sticky 버튼 영역 */}
        <div className="sticky bottom-0 left-0 z-20 bg-background border-t pt-4 mt-4">
          <div className="flex justify-end space-x-2">
            <Button
              type="button"
              variant="outline"
              onClick={() => setIsDialogOpen(false)}
              disabled={isProcessing}
            >
              취소
            </Button>
            <Button 
              type="button"
              onClick={form.handleSubmit(handleCreateRfq)}
              disabled={
                isProcessing || 
                !selectedProject || 
                selectedItems.length === 0
              }
            >
              {isProcessing ? "처리 중..." : `${selectedItems.length}개 아이템으로 해양 TOP RFQ 생성하기`}
            </Button>
          </div>
        </div>
      </DialogContent>
    </Dialog>
  )
}