"use client"

import * as React from "react"
import { Search, Loader2, CheckSquare, Square, ChevronDown, ChevronRight } from "lucide-react"
import { Button } from "@/components/ui/button"
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
  DialogTrigger,
} from "@/components/ui/dialog"
import { Input } from "@/components/ui/input"
import { Label } from "@/components/ui/label"
import { RadioGroup, RadioGroupItem } from "@/components/ui/radio-group"
import { ScrollArea } from "@/components/ui/scroll-area"
import { Separator } from "@/components/ui/separator"
import { toast } from "sonner"
import {
  searchShipbuildingItems,
  searchOffshoreTopItems,
  searchOffshoreHullItems,
  searchTechVendors,
  getTechVendorsContactsForMapping,
  addContactItemMapping,
} from "../service-add-mapping"

interface AddContactItemMappingDialogProps {
  trigger?: React.ReactNode
}

interface Item {
  id: number
  itemCode: string
  itemList: string
  workType: string | null
  shipTypes?: string | null
  subItemList?: string | null
}

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

interface Contact {
  id: number
  contactName: string
  contactPosition: string | null
  contactTitle: string | null
  contactEmail: string
  contactPhone: string | null
  isPrimary: boolean
}

export function AddContactItemMappingDialog({ trigger }: AddContactItemMappingDialogProps) {
  const [open, setOpen] = React.useState(false)
  const [isSubmitting, setIsSubmitting] = React.useState(false)

  const [selectedItemType, setSelectedItemType] = React.useState<'ship' | 'top' | 'hull'>('ship')
  const [itemSearch, setItemSearch] = React.useState("")
  const [items, setItems] = React.useState<Item[]>([])
  const [selectedItems, setSelectedItems] = React.useState<Set<number>>(new Set())
  const [isLoadingItems, setIsLoadingItems] = React.useState(false)
  
  // Section 2: 벤더 선택
  const [vendorSearch, setVendorSearch] = React.useState("")
  const [vendors, setVendors] = React.useState<Vendor[]>([])
  const [selectedVendors, setSelectedVendors] = React.useState<Set<number>>(new Set())
  const [isLoadingVendors, setIsLoadingVendors] = React.useState(false)

  // Section 3: 벤더별 담당자 선택
  const [vendorContacts, setVendorContacts] = React.useState<Record<number, Contact[]>>({})
  const [selectedContacts, setSelectedContacts] = React.useState<Record<number, Set<number>>>({})
  const [expandedVendors, setExpandedVendors] = React.useState<Set<number>>(new Set())
  const [isLoadingContacts, setIsLoadingContacts] = React.useState(false)

  // 아이템 타입 변경 시 아이템 로드
  React.useEffect(() => {
    loadItems()
  }, [selectedItemType, itemSearch])

  // 벤더 검색 디바운싱
  React.useEffect(() => {
    const timer = setTimeout(() => {
      loadVendors()
    }, 300)
    return () => clearTimeout(timer)
  }, [vendorSearch])

  // 선택된 벤더 변경 시 담당자 로드
  React.useEffect(() => {
    if (selectedVendors.size > 0) {
      loadContacts()
    }
  }, [selectedVendors])

  const loadItems = async () => {
    setIsLoadingItems(true)
    try {
      let result
      if (selectedItemType === 'ship') {
        result = await searchShipbuildingItems(itemSearch)
      } else if (selectedItemType === 'top') {
        result = await searchOffshoreTopItems(itemSearch)
      } else {
        result = await searchOffshoreHullItems(itemSearch)
      }
  
      setItems(result.data || [])
    } catch (err) {
      toast.error("아이템 로드 실패")
    } finally {
      setIsLoadingItems(false)
    }
  }

  const loadVendors = async () => {
    setIsLoadingVendors(true)
    try {
      const result = await searchTechVendors(vendorSearch)
      setVendors(result.data || [])
    } catch (err) {
      toast.error("벤더 로드 실패")
    } finally {
      setIsLoadingVendors(false)
    }
  }

  const loadContacts = async () => {
    setIsLoadingContacts(true)
    try {
      const vendorIds = Array.from(selectedVendors)
      const result = await getTechVendorsContactsForMapping(vendorIds)
      
      if (result.data) {
        const contacts: Record<number, Contact[]> = {}
        Object.entries(result.data).forEach(([vendorIdStr, vendorData]) => {
          const vendorId = parseInt(vendorIdStr)
          contacts[vendorId] = vendorData.contacts
        })
        setVendorContacts(contacts)
      }
    } catch (err) {
      toast.error("담당자 로드 실패")
    } finally {
      setIsLoadingContacts(false)
    }
  }
  const handleItemTypeChange = (type: 'ship' | 'top' | 'hull') => {
    setSelectedItemType(type)
    setSelectedItems(new Set()) // 타입 변경 시 선택 초기화
    setItemSearch("") // 검색어도 초기화
  }
  
  const handleItemSelect = (itemId: number) => {
    setSelectedItems(prev => {
      const newSet = new Set(prev)
      if (newSet.has(itemId)) {
        newSet.delete(itemId)
      } else {
        newSet.add(itemId)
      }
      return newSet
    })
  }

  const handleVendorSelect = (vendorId: number) => {
    setSelectedVendors(prev => {
      const newSet = new Set(prev)
      if (newSet.has(vendorId)) {
        newSet.delete(vendorId)
        // 벤더 선택 해제 시 해당 벤더의 담당자 선택도 초기화
        setSelectedContacts(prev => {
          const newContacts = { ...prev }
          delete newContacts[vendorId]
          return newContacts
        })
      } else {
        newSet.add(vendorId)
      }
      return newSet
    })
  }

  const handleContactSelect = (vendorId: number, contactId: number) => {
    setSelectedContacts(prev => {
      const vendorContacts = prev[vendorId] || new Set()
      const newSet = new Set(vendorContacts)
      if (newSet.has(contactId)) {
        newSet.delete(contactId)
      } else {
        newSet.add(contactId)
      }
      return { ...prev, [vendorId]: newSet }
    })
  }

  const toggleVendorExpand = (vendorId: number) => {
    setExpandedVendors(prev => {
      const newSet = new Set(prev)
      if (newSet.has(vendorId)) {
        newSet.delete(vendorId)
      } else {
        newSet.add(vendorId)
      }
      return newSet
    })
  }
  const handleSubmit = async () => {
    // 검증
    if (selectedItems.size === 0) {
      toast.error("최소 1개 이상의 아이템을 선택해주세요.")
      return
    }
  
    if (selectedVendors.size === 0) {
      toast.error("최소 1개 이상의 벤더를 선택해주세요.")
      return
    }
  
    const hasSelectedContacts = Object.values(selectedContacts).some(contacts => contacts.size > 0)
    if (!hasSelectedContacts) {
      toast.error("최소 1개 이상의 담당자를 선택해주세요.")
      return
    }
  
    setIsSubmitting(true)
    try {
      // 선택된 아이템 변환
      const itemType = selectedItemType === 'ship' ? 'SHIP' : selectedItemType === 'top' ? 'TOP' : 'HULL'
      const itemsToAdd: { id: number; type: 'SHIP' | 'TOP' | 'HULL' }[] = []
      selectedItems.forEach(id => itemsToAdd.push({ id, type: itemType }))
  

      // 벤더별 담당자 ID를 객체로 변환
      const contactsByVendor: Record<number, number[]> = {}
      Object.entries(selectedContacts).forEach(([vendorIdStr, contacts]) => {
        contactsByVendor[parseInt(vendorIdStr)] = Array.from(contacts)
      })

      const result = await addContactItemMapping({
        items: itemsToAdd,
        vendors: Array.from(selectedVendors),
        contactsByVendor,
      })

      if (result.error) {
        toast.error(result.error)
      } else {
        toast.success("담당자-아이템 매핑이 추가되었습니다.")
        setOpen(false)
        // 초기화
        resetForm()
      }
    } catch (err) {
      toast.error("매핑 추가 중 오류가 발생했습니다.")
    } finally {
      setIsSubmitting(false)
    }
  }

  const resetForm = () => {
    setSelectedItemType('ship')
    setItemSearch("")
    setSelectedItems(new Set())
    setVendorSearch("")
    setSelectedVendors(new Set())
    setSelectedContacts({})
    setExpandedVendors(new Set())
  }

  const getTotalSelectedContacts = () => {
    return Object.values(selectedContacts).reduce((sum, contacts) => sum + contacts.size, 0)
  }

  // 매핑 추가 버튼 활성화 조건
  const canSubmit = selectedItems.size > 0 && selectedVendors.size > 0 && getTotalSelectedContacts() > 0

  return (
    <Dialog open={open} onOpenChange={setOpen}>
      <DialogTrigger asChild>
        {trigger || (
          <Button variant="outline" size="sm">
            담당자-아이템 매핑 추가
          </Button>
        )}
      </DialogTrigger>
      <DialogContent className="max-w-6xl h-[90vh] flex flex-col overflow-hidden">
        <DialogHeader className="flex-shrink-0">
          <DialogTitle>아이템별 협력업체별 담당자 설정</DialogTitle>
          <DialogDescription>
            아이템, 협력업체, 담당자를 선택하여 매핑을 추가합니다.
          </DialogDescription>
        </DialogHeader>

        <div className="grid grid-cols-3 gap-4 flex-1 min-h-0 overflow-hidden">
          {/* Section 1: 아이템 선택 */}
          <div className="flex flex-col border rounded-lg p-3 min-h-0">
            <div className="space-y-2 flex-shrink-0">
              <Label className="text-sm font-semibold">
                1. 아이템 선택 ({selectedItems.size}개 선택)
              </Label>
              
              {/* 아이템 타입 필터 */}
              <RadioGroup value={selectedItemType} onValueChange={(value) => handleItemTypeChange(value as 'ship' | 'top' | 'hull')}>
                <div className="flex gap-3 text-sm">
                  <div className="flex items-center space-x-1">
                    <RadioGroupItem value="ship" id="type-ship" />
                    <Label htmlFor="type-ship" className="cursor-pointer font-normal">조선</Label>
                  </div>
                  <div className="flex items-center space-x-1">
                    <RadioGroupItem value="top" id="type-top" />
                    <Label htmlFor="type-top" className="cursor-pointer font-normal">해양 TOP</Label>
                  </div>
                  <div className="flex items-center space-x-1">
                    <RadioGroupItem value="hull" id="type-hull" />
                    <Label htmlFor="type-hull" className="cursor-pointer font-normal">해양 HULL</Label>
                  </div>
                </div>
              </RadioGroup>

              {/* 검색 */}
              <div className="relative">
                <Search className="absolute left-2 top-2.5 h-4 w-4 text-muted-foreground" />
                <Input
                  placeholder="아이템코드, 이름, 공종, 선종 검색..."
                  className="pl-8 h-9 text-sm"
                  value={itemSearch}
                  onChange={(e) => setItemSearch(e.target.value)}
                />
              </div>
            </div>

            {/* 아이템 리스트 */}
            <ScrollArea className="flex-1 min-h-0 mt-2 -mx-3 px-3">
              {isLoadingItems ? (
                <div className="flex items-center justify-center py-8">
                  <Loader2 className="h-6 w-6 animate-spin" />
                </div>
              ) : (
                <div className="space-y-1">
                  {items.length > 0 && items.map(item => (
                    <div
                      key={item.id}
                      className="flex items-start space-x-2 p-2 rounded hover:bg-accent cursor-pointer text-sm"
                      onClick={() => handleItemSelect(item.id)}
                    >
                      {selectedItems.has(item.id) ? (
                        <CheckSquare className="h-4 w-4 text-primary flex-shrink-0 mt-0.5" />
                      ) : (
                        <Square className="h-4 w-4 flex-shrink-0 mt-0.5" />
                      )}
                      <div className="flex-1 min-w-0 overflow-hidden">
                        <div className="font-medium break-words">{item.itemCode}</div>
                        <div className="text-xs text-muted-foreground break-words">{item.itemList}</div>
                        <div className="text-xs text-muted-foreground break-words">
                          {item.workType}
                          {item.shipTypes && ` • ${item.shipTypes}`}
                          {item.subItemList && ` • ${item.subItemList}`}
                        </div>
                      </div>
                    </div>
                  ))}
                </div>
              )}
            </ScrollArea>
          </div>

          {/* Section 2: 벤더 선택 */}
          <div className="flex flex-col border rounded-lg p-3 min-h-0">
            <div className="space-y-2 flex-shrink-0">
              <Label className="text-sm font-semibold">
                2. 협력업체 선택 ({selectedVendors.size}개 선택)
              </Label>
              
              {/* 검색 */}
              <div className="relative">
                <Search className="absolute left-2 top-2.5 h-4 w-4 text-muted-foreground" />
                <Input
                  placeholder="벤더코드, 벤더명, 이메일 검색..."
                  className="pl-8 h-9 text-sm"
                  value={vendorSearch}
                  onChange={(e) => setVendorSearch(e.target.value)}
                />
              </div>
            </div>

            {/* 벤더 리스트 */}
            <ScrollArea className="flex-1 min-h-0 mt-2 -mx-3 px-3">
              {isLoadingVendors ? (
                <div className="flex items-center justify-center py-8">
                  <Loader2 className="h-6 w-6 animate-spin" />
                </div>
              ) : (
                <div className="space-y-1">
                  {vendors.map(vendor => (
                    <div
                      key={vendor.id}
                      className="flex items-start space-x-2 p-2 rounded hover:bg-accent cursor-pointer text-sm"
                      onClick={() => handleVendorSelect(vendor.id)}
                    >
                      {selectedVendors.has(vendor.id) ? (
                        <CheckSquare className="h-4 w-4 text-primary flex-shrink-0 mt-0.5" />
                      ) : (
                        <Square className="h-4 w-4 flex-shrink-0 mt-0.5" />
                      )}
                      <div className="flex-1 min-w-0 overflow-hidden">
                        <div className="font-medium break-words">{vendor.vendorName}</div>
                        {vendor.vendorCode && (
                          <div className="text-xs text-muted-foreground break-words">{vendor.vendorCode}</div>
                        )}
                        <div className="text-xs text-muted-foreground break-words">
                          {vendor.techVendorType} • {vendor.status}
                        </div>
                      </div>
                    </div>
                  ))}
                </div>
              )}
            </ScrollArea>
          </div>

          {/* Section 3: 벤더별 담당자 선택 */}
          <div className="flex flex-col border rounded-lg p-3 min-h-0">
            <Label className="text-sm font-semibold flex-shrink-0">
              3. 담당자 선택 ({getTotalSelectedContacts()}명 선택)
            </Label>

            <ScrollArea className="flex-1 min-h-0 mt-2 -mx-3 px-3">
              {isLoadingContacts ? (
                <div className="flex items-center justify-center py-8">
                  <Loader2 className="h-6 w-6 animate-spin" />
                </div>
              ) : selectedVendors.size === 0 ? (
                <div className="flex items-center justify-center py-8 text-sm text-muted-foreground">
                  협력업체를 먼저 선택해주세요
                </div>
              ) : (
                <div className="space-y-1">
                  {Array.from(selectedVendors).map(vendorId => {
                    const contacts = vendorContacts[vendorId] || []
                    const vendor = vendors.find(v => v.id === vendorId)
                    const isExpanded = expandedVendors.has(vendorId)

                    return (
                      <div key={vendorId} className="border rounded">
                        {/* 벤더 헤더 */}
                        <div
                          className="flex items-center space-x-2 p-2 cursor-pointer hover:bg-accent"
                          onClick={() => toggleVendorExpand(vendorId)}
                        >
                          {isExpanded ? (
                            <ChevronDown className="h-4 w-4 flex-shrink-0" />
                          ) : (
                            <ChevronRight className="h-4 w-4 flex-shrink-0" />
                          )}
                          <div className="flex-1 min-w-0">
                            <div className="text-sm font-medium truncate">{vendor?.vendorName}</div>
                            <div className="text-xs text-muted-foreground">
                              담당자 {contacts.length}명 • {selectedContacts[vendorId]?.size || 0}명 선택
                            </div>
                          </div>
                        </div>

                        {/* 담당자 리스트 */}
                        {isExpanded && (
                          <div className="border-t bg-muted/30">
                            {contacts.length === 0 ? (
                              <div className="p-2 text-xs text-muted-foreground text-center">
                                등록된 담당자가 없습니다
                              </div>
                            ) : (
                              contacts.map(contact => (
                                <div
                                  key={contact.id}
                                  className="flex items-start space-x-2 p-2 hover:bg-accent cursor-pointer text-sm"
                                  onClick={() => handleContactSelect(vendorId, contact.id)}
                                >
                                  {selectedContacts[vendorId]?.has(contact.id) ? (
                                    <CheckSquare className="h-4 w-4 text-primary flex-shrink-0 mt-0.5" />
                                  ) : (
                                    <Square className="h-4 w-4 flex-shrink-0 mt-0.5" />
                                  )}
                                  <div className="flex-1 min-w-0">
                                    <div className="font-medium truncate">
                                      {contact.contactName}
                                      {contact.isPrimary && (
                                        <span className="ml-1 text-xs text-primary">(주담당)</span>
                                      )}
                                    </div>
                                    <div className="text-xs text-muted-foreground truncate">
                                      {contact.contactPosition}
                                    </div>
                                    <div className="text-xs text-muted-foreground truncate">
                                      {contact.contactEmail}
                                    </div>
                                  </div>
                                </div>
                              ))
                            )}
                          </div>
                        )}
                      </div>
                    )
                  })}
                </div>
              )}
            </ScrollArea>
          </div>
        </div>

        <DialogFooter className="flex-shrink-0 mt-4">
          <Button variant="outline" onClick={() => setOpen(false)} disabled={isSubmitting}>
            취소
          </Button>
          <Button 
            onClick={handleSubmit} 
            disabled={!canSubmit || isSubmitting}
          >
            {isSubmitting ? (
              <>
                <Loader2 className="mr-2 h-4 w-4 animate-spin" />
                추가 중...
              </>
            ) : (
              "매핑 추가"
            )}
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  )
}