'use client'

import React, { useState, useEffect } from 'react'
import { useSession } from 'next-auth/react'
import { Dialog, DialogContent, DialogHeader, DialogTitle } from '@/components/ui/dialog'
import { Button } from '@/components/ui/button'
import { Tabs, TabsContent, TabsList, TabsTrigger } from '@/components/ui/tabs'
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card'
import { Badge } from '@/components/ui/badge'
import { Checkbox } from '@/components/ui/checkbox'
import { Label } from '@/components/ui/label'
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select'
import { Input } from '@/components/ui/input'
import { toast } from 'sonner'
import { 
  FileText, 
  Upload, 
  Eye, 
  Send, 
  CheckCircle, 
  Download,
  AlertCircle
} from 'lucide-react'
import { ContractDocuments } from './general-contract-documents'
import { getActiveContractTemplates } from '@/lib/bidding/service'
import { type BasicContractTemplate } from '@/db/schema'
import { 
  getBasicInfo,
  getContractItems,
  getCommunicationChannel, 
  getLocation, 
  getFieldServiceRate, 
  getOffsetDetails, 
  getSubcontractChecklist,
  uploadContractApprovalFile,
  sendContractApprovalRequest
} from '../service'

interface ContractApprovalRequestDialogProps {
  contract: Record<string, unknown>
  open: boolean
  onOpenChange: (open: boolean) => void
}

interface ContractSummary {
  basicInfo: Record<string, unknown>
  items: Record<string, unknown>[]
  communicationChannel: Record<string, unknown> | null
  location: Record<string, unknown> | null
  fieldServiceRate: Record<string, unknown> | null
  offsetDetails: Record<string, unknown> | null
  subcontractChecklist: Record<string, unknown> | null
}

export function ContractApprovalRequestDialog({ 
  contract, 
  open, 
  onOpenChange 
}: ContractApprovalRequestDialogProps) {
  const { data: session } = useSession()
  const [currentStep, setCurrentStep] = useState(1)
  const [contractSummary, setContractSummary] = useState<ContractSummary | null>(null)
  const [uploadedFile, setUploadedFile] = useState<File | null>(null)
  const [generatedPdfUrl, setGeneratedPdfUrl] = useState<string | null>(null)
  const [generatedPdfBuffer, setGeneratedPdfBuffer] = useState<Uint8Array | null>(null)
  const [isLoading, setIsLoading] = useState(false)
  const [pdfViewerInstance, setPdfViewerInstance] = useState<any>(null)
  const [isPdfPreviewVisible, setIsPdfPreviewVisible] = useState(false)

  // 기본계약 관련 상태
  const [selectedBasicContracts, setSelectedBasicContracts] = useState<Array<{
    type: string;
    templateName: string;
    checked: boolean;
  }>>([])
  const [isLoadingBasicContracts, setIsLoadingBasicContracts] = useState(false)

  const contractId = contract.id as number
  const userId = session?.user?.id || ''

  // LOI 템플릿용 변수 매핑 함수
  const mapContractSummaryToLOITemplate = (contractSummary: ContractSummary) => {
    const { basicInfo, items } = contractSummary
    const firstItem = items && items.length > 0 ? items[0] : {}

    // 날짜 포맷팅 헬퍼 함수
    const formatDate = (date: any) => {
      if (!date) return ''
      try {
        const d = new Date(date)
        return d.toLocaleDateString('ko-KR')
      } catch {
        return ''
      }
    }

    return {
      // 날짜 관련 (템플릿에서 {{todayDate}} 형식으로 사용)
      todayDate: new Date().toLocaleDateString('ko-KR'),

      // 벤더 정보
      vendorName: basicInfo?.vendorName || '',
      representativeName: '', // 벤더 대표자 이름 - 현재 데이터에 없음, 향후 확장 가능

      // 계약 기본 정보
      contractNumber: basicInfo?.contractNumber || '',

      // 프로젝트 정보
      projectNumber: '', // 프로젝트 코드 - 현재 데이터에 없음, 향후 확장 가능
      projectName: basicInfo?.projectName || '',
      project: basicInfo?.projectName || '',

      // 아이템 정보
      item: firstItem?.itemInfo || '',

      // 무역 조건
      incoterms: basicInfo?.deliveryTerm || '', // Incoterms 대신 deliveryTerm 사용
      shippingLocation: basicInfo?.shippingLocation || '',

      // 금액 및 통화
      contractCurrency: basicInfo?.currency || '',
      contractAmount: basicInfo?.contractAmount || '',
      totalAmount: basicInfo?.contractAmount || '', // totalAmount가 없으면 contractAmount 사용

      // 수량
      quantity: firstItem?.quantity || '',

      // 납기일
      contractDeliveryDate: formatDate(basicInfo?.contractDeliveryDate),

      // 지급 조건
      paymentTerm: basicInfo?.paymentTerm || '',

      // 유효기간
      validityEndDate: formatDate(basicInfo?.endDate), // validityEndDate 대신 endDate 사용
    }
  }

  // 기본계약 생성 함수 (최종 전송 시점에 호출)
  const generateBasicContractPdf = async (
    vendorId: number,
    contractType: string,
    templateName: string
  ): Promise<{ buffer: number[], fileName: string }> => {
    try {
      // 1. 템플릿 데이터 준비 (서버 액션 호출)
      const prepareResponse = await fetch("/api/contracts/prepare-template", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          templateName,
          vendorId,
        }),
      });

      if (!prepareResponse.ok) {
        const errorText = await prepareResponse.text();
        throw new Error(`템플릿 준비 실패 (${prepareResponse.status}): ${errorText}`);
      }

      const { template, templateData } = await prepareResponse.json();

      // 2. 템플릿 파일 다운로드
      const templateResponse = await fetch("/api/contracts/get-template", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ templatePath: template.filePath }),
      });

      const templateBlob = await templateResponse.blob();
      const templateFile = new window.File([templateBlob], "template.docx", {
        type: "application/vnd.openxmlformats-officedocument.wordprocessingml.document"
      });

      // 3. PDFTron WebViewer로 PDF 변환
      const { default: WebViewer } = await import("@pdftron/webviewer");

      const tempDiv = document.createElement('div');
      tempDiv.style.display = 'none';
      document.body.appendChild(tempDiv);

      try {
        const instance = await WebViewer(
          {
            path: "/pdftronWeb",
            licenseKey: process.env.NEXT_PUBLIC_PDFTRON_WEBVIEW_KEY,
            fullAPI: true,
            enableOfficeEditing: true,
          },
          tempDiv
        );

        const { Core } = instance;
        const { createDocument } = Core;

        const templateDoc = await createDocument(templateFile, {
          filename: templateFile.name,
          extension: 'docx',
        });

        // 변수 치환 적용
        await templateDoc.applyTemplateValues(templateData);
        await new Promise(resolve => setTimeout(resolve, 3000));

        const fileData = await templateDoc.getFileData();
        const pdfBuffer = await Core.officeToPDFBuffer(fileData, { extension: 'docx' });

        const fileName = `${contractType}_${contractSummary?.basicInfo?.vendorCode || vendorId}_${Date.now()}.pdf`;

        instance.UI.dispose();
        return {
          buffer: Array.from(pdfBuffer),
          fileName
        };

      } finally {
        if (tempDiv.parentNode) {
          document.body.removeChild(tempDiv);
        }
      }

    } catch (error) {
      console.error(`기본계약 PDF 생성 실패 (${contractType}):`, error);
      throw error;
    }
  };

  // 기본계약 생성 및 선택 초기화
  const initializeBasicContracts = React.useCallback(async () => {
    if (!contractSummary?.basicInfo) return;

    setIsLoadingBasicContracts(true);
    try {
      // 기본적으로 사용할 수 있는 계약서 타입들
      const availableContracts: Array<{
        type: string;
        templateName: string;
        checked: boolean;
      }> = [
        { type: "NDA", templateName: "비밀", checked: false },
        { type: "General_GTC", templateName: "General GTC", checked: false },
        { type: "기술자료", templateName: "기술", checked: false }
      ];

      // 프로젝트 코드가 있으면 Project GTC도 추가
      if (contractSummary.basicInfo.projectCode) {
        availableContracts.push({
          type: "Project_GTC",
          templateName: contractSummary.basicInfo.projectCode as string,
          checked: false
        });
      }

      setSelectedBasicContracts(availableContracts);
    } catch (error) {
      console.error('기본계약 초기화 실패:', error);
      toast.error('기본계약 초기화에 실패했습니다.');
    } finally {
      setIsLoadingBasicContracts(false);
    }
  }, [contractSummary]);

  // 기본계약 선택 토글
  const toggleBasicContract = (type: string) => {
    setSelectedBasicContracts(prev =>
      prev.map(contract =>
        contract.type === type
          ? { ...contract, checked: !contract.checked }
          : contract
      )
    );
  };


  // 1단계: 계약 현황 수집
  const collectContractSummary = React.useCallback(async () => {
    setIsLoading(true)
    try {
      // 각 컴포넌트에서 활성화된 데이터만 수집
      const summary: ContractSummary = {
        basicInfo: {},
        items: [],
        communicationChannel: null,
        location: null,
        fieldServiceRate: null,
        offsetDetails: null,
        subcontractChecklist: null
      }

      // Basic Info 확인 (항상 활성화)
      try {
        const basicInfoData = await getBasicInfo(contractId)
        if (basicInfoData && basicInfoData.success) {
          summary.basicInfo = basicInfoData.data || {}
        }
      } catch {
        console.log('Basic Info 데이터 없음')
      }

      // 품목 정보 확인
      try {
        const itemsData = await getContractItems(contractId)
        if (itemsData && itemsData.length > 0) {
          summary.items = itemsData
        }
      } catch {
        console.log('품목 정보 데이터 없음')
      }

      // 각 컴포넌트의 활성화 상태 및 데이터 확인
      try {
        // Communication Channel 확인
        const commData = await getCommunicationChannel(contractId)
        if (commData && commData.enabled) {
          summary.communicationChannel = commData
        }
      } catch {
        console.log('Communication Channel 데이터 없음')
      }

      try {
        // Location 확인
        const locationData = await getLocation(contractId)
        if (locationData && locationData.enabled) {
          summary.location = locationData
        }
      } catch {
        console.log('Location 데이터 없음')
      }

      try {
        // Field Service Rate 확인
        const fieldServiceData = await getFieldServiceRate(contractId)
        if (fieldServiceData && fieldServiceData.enabled) {
          summary.fieldServiceRate = fieldServiceData
        }
      } catch {
        console.log('Field Service Rate 데이터 없음')
      }

      try {
        // Offset Details 확인
        const offsetData = await getOffsetDetails(contractId)
        if (offsetData && offsetData.enabled) {
          summary.offsetDetails = offsetData
        }
      } catch {
        console.log('Offset Details 데이터 없음')
      }

      try {
        // Subcontract Checklist 확인
        const subcontractData = await getSubcontractChecklist(contractId)
        if (subcontractData && subcontractData.success && subcontractData.enabled) {
          summary.subcontractChecklist = subcontractData.data
        }
      } catch {
        console.log('Subcontract Checklist 데이터 없음')
      }
      
      console.log('contractSummary 구조:', summary)
      console.log('basicInfo 내용:', summary.basicInfo)
      setContractSummary(summary)
    } catch (error) {
      console.error('Error collecting contract summary:', error)
      toast.error('계약 정보를 수집하는 중 오류가 발생했습니다.')
    } finally {
      setIsLoading(false)
    }
  }, [contractId])

  // 3단계: 파일 업로드 처리
  const handleFileUpload = async (file: File) => {
    // 파일 확장자 검증
    const allowedExtensions = ['.doc', '.docx']
    const fileExtension = file.name.toLowerCase().substring(file.name.lastIndexOf('.'))
    
    if (!allowedExtensions.includes(fileExtension)) {
      toast.error('Word 문서(.doc, .docx) 파일만 업로드 가능합니다.')
      return
    }

    if (!userId) {
      toast.error('로그인이 필요합니다.')
      return
    }

    setIsLoading(true)
    try {
      // 서버액션을 사용하여 파일 저장 (본 계약문서로 고정)
      const result = await uploadContractApprovalFile(
        contractId,
        file,
        userId
      )

      if (result.success) {
        setUploadedFile(file)
        toast.success('파일이 업로드되었습니다.')
      } else {
        throw new Error(result.error || '파일 업로드 실패')
      }
    } catch (error) {
      console.error('Error uploading file:', error)
      toast.error('파일 업로드 중 오류가 발생했습니다.')
    } finally {
      setIsLoading(false)
    }
  }

  // 4단계: PDF 생성 및 미리보기 (PDFTron 사용)
  const generatePdf = async () => {
    if (!uploadedFile || !contractSummary) {
      toast.error('업로드된 파일과 계약 정보가 필요합니다.')
      return
    }

    setIsLoading(true)
    try {
      // PDFTron을 사용해서 변수 치환 및 PDF 변환
      // @ts-ignore
      const WebViewer = await import("@pdftron/webviewer").then(({ default: WebViewer }) => WebViewer)
      
      // 임시 WebViewer 인스턴스 생성 (DOM에 추가하지 않음)
      const tempDiv = document.createElement('div')
      tempDiv.style.display = 'none'
      document.body.appendChild(tempDiv)

      const instance = await WebViewer(
        {
          path: "/pdftronWeb",
          licenseKey: process.env.NEXT_PUBLIC_PDFTRON_WEBVIEW_KEY,
          fullAPI: true,
        },
        tempDiv
      )

      try {
        const { Core } = instance
        const { createDocument } = Core

      // 템플릿 문서 생성 및 변수 치환
      const templateDoc = await createDocument(uploadedFile, {
        filename: uploadedFile.name,
        extension: 'docx',
      })

      // LOI 템플릿용 변수 매핑
      const mappedTemplateData = mapContractSummaryToLOITemplate(contractSummary)

      console.log("🔄 변수 치환 시작:", mappedTemplateData)
      await templateDoc.applyTemplateValues(mappedTemplateData as any)
      console.log("✅ 변수 치환 완료")

      // PDF 변환
      const fileData = await templateDoc.getFileData()
        const pdfBuffer = await (Core as any).officeToPDFBuffer(fileData, { extension: 'docx' })

      console.log(`✅ PDF 변환 완료: ${uploadedFile.name}`, `크기: ${pdfBuffer.byteLength} bytes`)

      // PDF 버퍼를 Blob URL로 변환하여 미리보기
      const pdfBlob = new Blob([pdfBuffer], { type: 'application/pdf' })
      const pdfUrl = URL.createObjectURL(pdfBlob)
      setGeneratedPdfUrl(pdfUrl)
      
      // PDF 버퍼를 상태에 저장 (최종 전송 시 사용)
      setGeneratedPdfBuffer(new Uint8Array(pdfBuffer))
      
      toast.success('PDF가 생성되었습니다.')

      } finally {
        // 임시 WebViewer 정리
        instance.UI.dispose()
        document.body.removeChild(tempDiv)
      }

    } catch (error) {
      console.error('❌ PDF 생성 실패:', error)
      toast.error('PDF 생성 중 오류가 발생했습니다.')
    } finally {
      setIsLoading(false)
    }
  }

  // PDF 미리보기 기능
  const openPdfPreview = async () => {
    if (!generatedPdfBuffer) {
      toast.error('생성된 PDF가 없습니다.')
      return
    }

    setIsLoading(true)
    try {
      // @ts-ignore
      const WebViewer = await import("@pdftron/webviewer").then(({ default: WebViewer }) => WebViewer)
      
      // 기존 인스턴스가 있다면 정리
      if (pdfViewerInstance) {
        console.log("🔄 기존 WebViewer 인스턴스 정리")
        try {
          pdfViewerInstance.UI.dispose()
        } catch (error) {
          console.warn('기존 WebViewer 정리 중 오류:', error)
        }
        setPdfViewerInstance(null)
      }

      // 미리보기용 컨테이너 확인
      let previewDiv = document.getElementById('pdf-preview-container')
      if (!previewDiv) {
        console.log("🔄 컨테이너 생성")
        previewDiv = document.createElement('div')
        previewDiv.id = 'pdf-preview-container'
        previewDiv.className = 'w-full h-full'
        previewDiv.style.width = '100%'
        previewDiv.style.height = '100%'
        
        // 실제 컨테이너에 추가
        const actualContainer = document.querySelector('[data-pdf-container]')
        if (actualContainer) {
          actualContainer.appendChild(previewDiv)
        }
      }

      console.log("🔄 WebViewer 인스턴스 생성 시작")

      // WebViewer 인스턴스 생성 (문서 없이)
      const instance = await Promise.race([
        WebViewer(
          {
            path: "/pdftronWeb",
            licenseKey: process.env.NEXT_PUBLIC_PDFTRON_WEBVIEW_KEY,
            fullAPI: true,
          },
          previewDiv
        ),
        new Promise((_, reject) => 
          setTimeout(() => reject(new Error('WebViewer 초기화 타임아웃')), 30000)
        )
      ])

      console.log("🔄 WebViewer 인스턴스 생성 완료")
      setPdfViewerInstance(instance)

      // PDF 버퍼를 Blob으로 변환
      const pdfBlob = new Blob([generatedPdfBuffer], { type: 'application/pdf' })
      const pdfUrl = URL.createObjectURL(pdfBlob)
      console.log("🔄 PDF Blob URL 생성:", pdfUrl)

      // 문서 로드
      console.log("🔄 문서 로드 시작")
      const { documentViewer } = instance.Core
      
      // 문서 로드 이벤트 대기
      await new Promise((resolve, reject) => {
        const timeout = setTimeout(() => {
          reject(new Error('문서 로드 타임아웃'))
        }, 20000)

        const onDocumentLoaded = () => {
          clearTimeout(timeout)
          documentViewer.removeEventListener('documentLoaded', onDocumentLoaded)
          documentViewer.removeEventListener('documentError', onDocumentError)
          console.log("🔄 문서 로드 완료")
          resolve(true)
        }

        const onDocumentError = (error: any) => {
          clearTimeout(timeout)
          documentViewer.removeEventListener('documentLoaded', onDocumentLoaded)
          documentViewer.removeEventListener('documentError', onDocumentError)
          console.error('문서 로드 오류:', error)
          reject(error)
        }

        documentViewer.addEventListener('documentLoaded', onDocumentLoaded)
        documentViewer.addEventListener('documentError', onDocumentError)
        
        // 문서 로드 시작
        documentViewer.loadDocument(pdfUrl)
      })

      setIsPdfPreviewVisible(true)
      toast.success('PDF 미리보기가 준비되었습니다.')

    } catch (error) {
      console.error('PDF 미리보기 실패:', error)
      toast.error(`PDF 미리보기 중 오류가 발생했습니다: ${error.message}`)
    } finally {
      setIsLoading(false)
    }
  }

  // PDF 다운로드 기능
  const downloadPdf = () => {
    if (!generatedPdfBuffer) {
      toast.error('다운로드할 PDF가 없습니다.')
      return
    }

    const pdfBlob = new Blob([generatedPdfBuffer], { type: 'application/pdf' })
    const pdfUrl = URL.createObjectURL(pdfBlob)
    
    const link = document.createElement('a')
    link.href = pdfUrl
    link.download = `contract_${contractId}_${Date.now()}.pdf`
    document.body.appendChild(link)
    link.click()
    document.body.removeChild(link)
    
    URL.revokeObjectURL(pdfUrl)
    toast.success('PDF가 다운로드되었습니다.')
  }

  // PDF 미리보기 닫기
  const closePdfPreview = () => {
    console.log("🔄 PDF 미리보기 닫기 시작")
    if (pdfViewerInstance) {
      try {
        console.log("🔄 WebViewer 인스턴스 정리")
        pdfViewerInstance.UI.dispose()
      } catch (error) {
        console.warn('WebViewer 정리 중 오류:', error)
      }
      setPdfViewerInstance(null)
    }
    
    // 컨테이너 정리
    const previewDiv = document.getElementById('pdf-preview-container')
    if (previewDiv) {
      try {
        previewDiv.innerHTML = ''
      } catch (error) {
        console.warn('컨테이너 정리 중 오류:', error)
      }
    }
    
    setIsPdfPreviewVisible(false)
    console.log("🔄 PDF 미리보기 닫기 완료")
  }

  // 최종 전송
  const handleFinalSubmit = async () => {
    if (!generatedPdfUrl || !contractSummary || !generatedPdfBuffer) {
      toast.error('생성된 PDF가 필요합니다.')
      return
    }

    if (!userId) {
      toast.error('로그인이 필요합니다.')
      return
    }

    setIsLoading(true)
    try {
      // 기본계약서 생성 (최종 전송 시점에)
      let generatedBasicContractPdfs: Array<{ key: string; buffer: number[]; fileName: string }> = [];

      const contractsToGenerate = selectedBasicContracts.filter(c => c.checked);
      if (contractsToGenerate.length > 0) {
        // vendorId 조회
        let vendorId: number | undefined;
        try {
          const basicInfoData = await getBasicInfo(contractId);
          if (basicInfoData && basicInfoData.success && basicInfoData.data) {
            vendorId = basicInfoData.data.vendorId;
          }
        } catch (error) {
          console.error('vendorId 조회 실패:', error);
        }

        if (vendorId) {
          toast.info('기본계약서를 생성하는 중입니다...');

          for (const contract of contractsToGenerate) {
            try {
              const pdf = await generateBasicContractPdf(vendorId, contract.type, contract.templateName);
              generatedBasicContractPdfs.push({
                key: `${vendorId}_${contract.type}_${contract.templateName}`,
                ...pdf
              });
            } catch (error) {
              console.error(`${contract.type} 계약서 생성 실패:`, error);
              // 개별 실패는 전체를 중단하지 않음
            }
          }

          if (generatedBasicContractPdfs.length > 0) {
            toast.success(`${generatedBasicContractPdfs.length}개의 기본계약서가 생성되었습니다.`);
          }
        }
      }

      // 서버액션을 사용하여 계약승인요청 전송
      const result = await sendContractApprovalRequest(
        contractSummary,
        generatedPdfBuffer,
        'contractDocument',
        userId,
        generatedBasicContractPdfs
      )

      if (result.success) {
        toast.success('계약승인요청이 전송되었습니다.')
        onOpenChange(false)
      } else {
        // 서버에서 이미 처리된 에러 메시지 표시
        toast.error(result.error || '계약승인요청 전송 실패')
        return
      }
    } catch (error: any) {
      console.error('Error submitting approval request:', error)

      // 데이터베이스 중복 키 오류 처리
      if (error.message && error.message.includes('duplicate key value violates unique constraint')) {
        toast.error('이미 존재하는 계약번호입니다. 다른 계약번호를 사용해주세요.')
        return
      }

      // 다른 오류에 대한 일반적인 처리
      toast.error('계약승인요청 전송 중 오류가 발생했습니다.')
    } finally {
      setIsLoading(false)
    }
  }

  // 다이얼로그가 열릴 때 1단계 데이터 수집
  useEffect(() => {
    if (open && currentStep === 1) {
      collectContractSummary()
    }
  }, [open, currentStep, collectContractSummary])

  // 계약 요약이 준비되면 기본계약 초기화
  useEffect(() => {
    if (contractSummary && currentStep === 2) {
      const loadBasicContracts = async () => {
        await initializeBasicContracts()
      }
      loadBasicContracts()
    }
  }, [contractSummary, currentStep, initializeBasicContracts])

  // 다이얼로그가 닫힐 때 PDF 뷰어 정리
  useEffect(() => {
    if (!open) {
      closePdfPreview()
    }
  }, [open])


  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="max-w-6xl max-h-[90vh] overflow-y-auto">
        <DialogHeader>
          <DialogTitle className="flex items-center gap-2">
            <FileText className="h-5 w-5" />
            계약승인요청
          </DialogTitle>
        </DialogHeader>

        <Tabs value={currentStep.toString()} className="w-full">
          <TabsList className="grid w-full grid-cols-4">
            <TabsTrigger value="1" disabled={currentStep < 1}>
              1. 계약 현황 정리
            </TabsTrigger>
            <TabsTrigger value="2" disabled={currentStep < 2}>
              2. 기본계약 체크
            </TabsTrigger>
            <TabsTrigger value="3" disabled={currentStep < 3}>
              3. 문서 업로드
            </TabsTrigger>
            <TabsTrigger value="4" disabled={currentStep < 4}>
              4. PDF 미리보기
            </TabsTrigger>
          </TabsList>

          {/* 1단계: 계약 현황 정리 */}
          <TabsContent value="1" className="space-y-4">
            <Card>
              <CardHeader>
                <CardTitle className="flex items-center gap-2">
                  <CheckCircle className="h-5 w-5 text-green-600" />
                  작성된 계약 현황
                </CardTitle>
              </CardHeader>
              <CardContent className="space-y-4">
                {isLoading ? (
                  <div className="text-center py-4">
                    <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-blue-600 mx-auto"></div>
                    <p className="mt-2 text-sm text-muted-foreground">계약 정보를 수집하는 중...</p>
                  </div>
                ) : (
                  <div className="space-y-4">
                    {/* 기본 정보 (필수) */}
                    <div className="border rounded-lg p-4">
                      <div className="flex items-center gap-2 mb-3">
                        <CheckCircle className="h-4 w-4 text-green-600" />
                        <Label className="font-medium">기본 정보</Label>
                        <Badge variant="secondary">필수</Badge>
                      </div>
                      <div className="grid grid-cols-2 gap-4 text-sm">
                        <div>
                          <span className="font-medium">계약번호:</span> {String(contractSummary?.basicInfo?.contractNumber || '')}
                        </div>
                        <div>
                          <span className="font-medium">계약명:</span> {String(contractSummary?.basicInfo?.contractName || '')}
                        </div>
                        <div>
                          <span className="font-medium">벤더:</span> {String(contractSummary?.basicInfo?.vendorName || '')}
                        </div>
                        <div>
                          <span className="font-medium">프로젝트:</span> {String(contractSummary?.basicInfo?.projectName || '')}
                        </div>
                        <div>
                          <span className="font-medium">계약유형:</span> {String(contractSummary?.basicInfo?.contractType || '')}
                        </div>
                        <div>
                          <span className="font-medium">계약상태:</span> {String(contractSummary?.basicInfo?.contractStatus || '')}
                        </div>
                        <div>
                          <span className="font-medium">계약금액:</span> {String(contractSummary?.basicInfo?.contractAmount || '')} {String(contractSummary?.basicInfo?.currency || '')}
                        </div>
                        <div>
                          <span className="font-medium">계약기간:</span> {String(contractSummary?.basicInfo?.startDate || '')} ~ {String(contractSummary?.basicInfo?.endDate || '')}
                        </div>
                        <div>
                          <span className="font-medium">사양서 유형:</span> {String(contractSummary?.basicInfo?.specificationType || '')}
                        </div>
                        <div>
                          <span className="font-medium">단가 유형:</span> {String(contractSummary?.basicInfo?.unitPriceType || '')}
                        </div>
                        <div>
                          <span className="font-medium">연결 PO번호:</span> {String(contractSummary?.basicInfo?.linkedPoNumber || '')}
                        </div>
                        <div>
                          <span className="font-medium">연결 입찰번호:</span> {String(contractSummary?.basicInfo?.linkedBidNumber || '')}
                        </div>
                      </div>
                    </div>

                    {/* 지급/인도 조건 */}
                    <div className="border rounded-lg p-4">
                      <div className="flex items-center gap-2 mb-3">
                        <CheckCircle className="h-4 w-4 text-green-600" />
                        <Label className="font-medium">지급/인도 조건</Label>
                        <Badge variant="secondary">필수</Badge>
                      </div>
                      <div className="grid grid-cols-2 gap-4 text-sm">
                        <div>
                          <span className="font-medium">지급조건:</span> {String(contractSummary?.basicInfo?.paymentTerm || '')}
                        </div>
                        <div>
                          <span className="font-medium">세금 유형:</span> {String(contractSummary?.basicInfo?.taxType || '')}
                        </div>
                        <div>
                          <span className="font-medium">인도조건:</span> {String(contractSummary?.basicInfo?.deliveryTerm || '')}
                        </div>
                        <div>
                          <span className="font-medium">인도유형:</span> {String(contractSummary?.basicInfo?.deliveryType || '')}
                        </div>
                        <div>
                          <span className="font-medium">선적지:</span> {String(contractSummary?.basicInfo?.shippingLocation || '')}
                        </div>
                        <div>
                          <span className="font-medium">하역지:</span> {String(contractSummary?.basicInfo?.dischargeLocation || '')}
                        </div>
                        <div>
                          <span className="font-medium">계약납기:</span> {String(contractSummary?.basicInfo?.contractDeliveryDate || '')}
                        </div>
                        <div>
                          <span className="font-medium">위약금:</span> {contractSummary?.basicInfo?.liquidatedDamages ? '적용' : '미적용'}
                        </div>
                      </div>
                    </div>

                    {/* 추가 조건 */}
                    <div className="border rounded-lg p-4">
                      <div className="flex items-center gap-2 mb-3">
                        <CheckCircle className="h-4 w-4 text-green-600" />
                        <Label className="font-medium">추가 조건</Label>
                        <Badge variant="secondary">필수</Badge>
                      </div>
                      <div className="grid grid-cols-2 gap-4 text-sm">
                        <div>
                          <span className="font-medium">연동제 정보:</span> {String(contractSummary?.basicInfo?.interlockingSystem || '')}
                        </div>
                        <div>
                          <span className="font-medium">계약성립조건:</span> 
                          {contractSummary?.basicInfo?.contractEstablishmentConditions && 
                            Object.entries(contractSummary.basicInfo.contractEstablishmentConditions)
                              .filter(([, value]) => value === true)
                              .map(([key]) => key)
                              .join(', ') || '없음'}
                        </div>
                        <div>
                          <span className="font-medium">계약해지조건:</span>
                          {contractSummary?.basicInfo?.contractTerminationConditions && 
                            Object.entries(contractSummary.basicInfo.contractTerminationConditions)
                              .filter(([, value]) => value === true)
                              .map(([key]) => key)
                              .join(', ') || '없음'}
                        </div>
                      </div>
                    </div>

                    {/* 품목 정보 */}
                    <div className="border rounded-lg p-4">
                      <div className="flex items-center gap-2 mb-3">
                        <Checkbox 
                          id="items-enabled" 
                          checked={contractSummary?.items && contractSummary.items.length > 0}
                          disabled
                        />
                        <Label htmlFor="items-enabled" className="font-medium">품목 정보</Label>
                        <Badge variant="outline">선택</Badge>
                      </div>
                      {contractSummary?.items && contractSummary.items.length > 0 ? (
                        <div className="space-y-2">
                          <p className="text-sm text-muted-foreground">
                            총 {contractSummary.items.length}개 품목이 입력되어 있습니다.
                          </p>
                          <div className="max-h-32 overflow-y-auto">
                            {contractSummary.items.slice(0, 3).map((item: Record<string, unknown>, index: number) => (
                              <div key={index} className="text-xs bg-gray-50 p-2 rounded">
                                <div className="font-medium">{item.itemInfo || item.description || `품목 ${index + 1}`}</div>
                                <div className="text-muted-foreground">
                                  수량: {item.quantity || 0} | 단가: {item.contractUnitPrice || item.unitPrice || 0}
                                </div>
                              </div>
                            ))}
                            {contractSummary.items.length > 3 && (
                              <div className="text-xs text-muted-foreground text-center">
                                ... 외 {contractSummary.items.length - 3}개 품목
                              </div>
                            )}
                          </div>
                        </div>
                      ) : (
                        <p className="text-sm text-muted-foreground">
                          품목 정보가 입력되지 않았습니다.
                        </p>
                      )}
                    </div>

                    {/* 커뮤니케이션 채널 */}
                    <div className="border rounded-lg p-4">
                      <div className="flex items-center gap-2 mb-3">
                        <Checkbox 
                          id="communication-enabled" 
                          checked={!!contractSummary?.communicationChannel}
                          disabled
                        />
                        <Label htmlFor="communication-enabled" className="font-medium">
                          커뮤니케이션 채널
                        </Label>
                        <Badge variant="outline">선택</Badge>
                      </div>
                      <p className="text-sm text-muted-foreground">
                        {contractSummary?.communicationChannel 
                          ? '정보가 입력되어 있습니다.' 
                          : '정보가 입력되지 않았습니다.'}
                      </p>
                    </div>

                    {/* 위치 정보 */}
                    <div className="border rounded-lg p-4">
                      <div className="flex items-center gap-2 mb-3">
                        <Checkbox 
                          id="location-enabled" 
                          checked={!!contractSummary?.location}
                          disabled
                        />
                        <Label htmlFor="location-enabled" className="font-medium">
                          위치 정보
                        </Label>
                        <Badge variant="outline">선택</Badge>
                      </div>
                      <p className="text-sm text-muted-foreground">
                        {contractSummary?.location 
                          ? '정보가 입력되어 있습니다.' 
                          : '정보가 입력되지 않았습니다.'}
                      </p>
                    </div>

                    {/* 현장 서비스 요율 */}
                    <div className="border rounded-lg p-4">
                      <div className="flex items-center gap-2 mb-3">
                        <Checkbox 
                          id="fieldService-enabled" 
                          checked={!!contractSummary?.fieldServiceRate}
                          disabled
                        />
                        <Label htmlFor="fieldService-enabled" className="font-medium">
                          현장 서비스 요율
                        </Label>
                        <Badge variant="outline">선택</Badge>
                      </div>
                      <p className="text-sm text-muted-foreground">
                        {contractSummary?.fieldServiceRate 
                          ? '정보가 입력되어 있습니다.' 
                          : '정보가 입력되지 않았습니다.'}
                      </p>
                    </div>

                    {/* 오프셋 세부사항 */}
                    <div className="border rounded-lg p-4">
                      <div className="flex items-center gap-2 mb-3">
                        <Checkbox 
                          id="offset-enabled" 
                          checked={!!contractSummary?.offsetDetails}
                          disabled
                        />
                        <Label htmlFor="offset-enabled" className="font-medium">
                          오프셋 세부사항
                        </Label>
                        <Badge variant="outline">선택</Badge>
                      </div>
                      <p className="text-sm text-muted-foreground">
                        {contractSummary?.offsetDetails 
                          ? '정보가 입력되어 있습니다.' 
                          : '정보가 입력되지 않았습니다.'}
                      </p>
                    </div>

                    {/* 하도급 체크리스트 */}
                    <div className="border rounded-lg p-4">
                      <div className="flex items-center gap-2 mb-3">
                        <Checkbox 
                          id="subcontract-enabled" 
                          checked={!!contractSummary?.subcontractChecklist}
                          disabled
                        />
                        <Label htmlFor="subcontract-enabled" className="font-medium">
                          하도급 체크리스트
                        </Label>
                        <Badge variant="outline">선택</Badge>
                      </div>
                      <p className="text-sm text-muted-foreground">
                        {contractSummary?.subcontractChecklist 
                          ? '정보가 입력되어 있습니다.' 
                          : '정보가 입력되지 않았습니다.'}
                      </p>
                    </div>
                  </div>
                )}
              </CardContent>
            </Card>

            <div className="flex justify-end">
              <Button 
                onClick={() => setCurrentStep(2)}
                disabled={isLoading}
              >
                다음 단계
              </Button>
            </div>
          </TabsContent>

          {/* 2단계: 기본계약 체크 */}
          <TabsContent value="2" className="space-y-4">
            <Card>
              <CardHeader>
                <CardTitle className="flex items-center gap-2">
                  <FileText className="h-5 w-5 text-blue-600" />
                  기본계약서 선택
                </CardTitle>
                <p className="text-sm text-muted-foreground">
                  벤더에게 발송할 기본계약서를 선택해주세요. (템플릿이 있는 계약서만 선택 가능합니다.)
                </p>
              </CardHeader>
              <CardContent className="space-y-4">
                {isLoadingBasicContracts ? (
                  <div className="text-center py-8">
                    <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-blue-600 mx-auto"></div>
                    <p className="mt-2 text-sm text-muted-foreground">기본계약 템플릿을 불러오는 중...</p>
                  </div>
                ) : (
                  <div className="space-y-4">
                    {selectedBasicContracts.length > 0 ? (
                      <div className="space-y-3">
                        <div className="flex items-center justify-between">
                          <h4 className="font-medium">필요한 기본계약서</h4>
                          <Badge variant="outline">
                            {selectedBasicContracts.filter(c => c.checked).length}개 선택됨
                          </Badge>
                        </div>

                        <div className="grid gap-3">
                          {selectedBasicContracts.map((contract) => (
                            <div
                              key={contract.type}
                              className="flex items-center justify-between p-3 border rounded-lg hover:bg-muted/50"
                            >
                              <div className="flex items-center gap-3">
                                <Checkbox
                                  id={`contract-${contract.type}`}
                                  checked={contract.checked}
                                  onCheckedChange={() => toggleBasicContract(contract.type)}
                                />
                                <div>
                                  <Label
                                    htmlFor={`contract-${contract.type}`}
                                    className="font-medium cursor-pointer"
                                  >
                                    {contract.type}
                                  </Label>
                                  <p className="text-sm text-muted-foreground">
                                    템플릿: {contract.templateName}
                                  </p>
                                </div>
                              </div>
                              <Badge
                                variant="secondary"
                                className="text-xs"
                              >
                                {contract.checked ? "선택됨" : "미선택"}
                              </Badge>
                            </div>
                          ))}
                        </div>

                      </div>
                    ) : (
                      <div className="text-center py-8 text-muted-foreground">
                        <FileText className="h-12 w-12 mx-auto mb-4 opacity-50" />
                        <p>기본계약서 목록을 불러올 수 없습니다.</p>
                        <p className="text-sm">잠시 후 다시 시도해주세요.</p>
                      </div>
                    )}

                  </div>
                )}
              </CardContent>
            </Card>

            <div className="flex justify-between">
              <Button variant="outline" onClick={() => setCurrentStep(1)}>
                이전 단계
              </Button>
              <Button
                onClick={() => setCurrentStep(3)}
                disabled={isLoadingBasicContracts}
              >
                다음 단계
              </Button>
            </div>
          </TabsContent>

          {/* 3단계: 문서 업로드 */}
          <TabsContent value="3" className="space-y-4">
            <Card>
              <CardHeader>
                <CardTitle className="flex items-center gap-2">
                  <Upload className="h-5 w-5 text-blue-600" />
                  계약서 업로드
                </CardTitle>
              </CardHeader>
              <CardContent className="space-y-4">
                <div className="space-y-4">
                <p className="text-lg text-muted-foreground">일반계약 표준문서 관리 페이지에 접속하여, 원하는 양식의 계약서를 다운받아 수정 후 업로드하세요.</p>
                  <div>
                    <Label htmlFor="file-upload">파일 업로드</Label>
                    <Input
                      id="file-upload"
                      type="file"
                      accept=".doc,.docx"
                      onChange={(e) => {
                        const file = e.target.files?.[0]
                        if (file) handleFileUpload(file)
                      }}
                    />
                    <p className="text-sm text-muted-foreground mt-1">
                      Word 문서(.doc, .docx) 파일만 업로드 가능합니다.
                    </p>
                  </div>

                  {/* ContractDocuments 컴포넌트 사용 */}
                  {/* <div className="mt-4">
                    <Label>업로드된 문서</Label>
                    <ContractDocuments 
                      contractId={contractId} 
                      userId={userId}
                      readOnly={false}
                    />
                  </div> */}

                  {uploadedFile && (
                    <div className="border rounded-lg p-4 bg-green-50">
                      <div className="flex items-center gap-2">
                        <CheckCircle className="h-4 w-4 text-green-600" />
                        <span className="font-medium text-green-900">업로드 완료</span>
                      </div>
                      <p className="text-sm text-green-800 mt-1">{uploadedFile.name}</p>
                    </div>
                  )}
                </div>
              </CardContent>
            </Card>

            <div className="flex justify-between">
              <Button variant="outline" onClick={() => setCurrentStep(2)}>
                이전 단계
              </Button>
              <Button
                onClick={() => setCurrentStep(4)}
                disabled={!uploadedFile}
              >
                다음 단계
              </Button>
            </div>
          </TabsContent>

          {/* 4단계: PDF 미리보기 */}
          <TabsContent value="4" className="space-y-4">
            <Card>
              <CardHeader>
                <CardTitle className="flex items-center gap-2">
                  <Eye className="h-5 w-5 text-purple-600" />
                  PDF 미리보기
                </CardTitle>
              </CardHeader>
              <CardContent className="space-y-4">
                {!generatedPdfUrl ? (
                  <div className="text-center py-8">
                    <Button onClick={generatePdf} disabled={isLoading}>
                      {isLoading ? 'PDF 생성 중...' : 'PDF 생성하기'}
                    </Button>
                  </div>
                ) : (
                  <div className="space-y-4">
                    <div className="border rounded-lg p-4 bg-green-50">
                      <div className="flex items-center gap-2">
                        <CheckCircle className="h-4 w-4 text-green-600" />
                        <span className="font-medium text-green-900">PDF 생성 완료</span>
                      </div>
                    </div>

                    <div className="border rounded-lg p-4">
                      <div className="flex items-center justify-between mb-4">
                        <h4 className="font-medium">생성된 PDF</h4>
                        <div className="flex gap-2">
                          <Button 
                            variant="outline" 
                            size="sm"
                            onClick={downloadPdf}
                            disabled={isLoading}
                          >
                            <Download className="h-4 w-4 mr-2" />
                            다운로드
                          </Button>
                          <Button 
                            variant="outline" 
                            size="sm"
                            onClick={openPdfPreview}
                            disabled={isLoading}
                          >
                            <Eye className="h-4 w-4 mr-2" />
                            미리보기
                          </Button>
                        </div>
                      </div>
                      
                      {/* PDF 미리보기 영역 */}
                      <div className="border rounded-lg h-96 bg-gray-50 relative" data-pdf-container>
                        {isPdfPreviewVisible ? (
                          <>
                            <div className="absolute top-2 right-2 z-10">
                              <Button 
                                variant="outline" 
                                size="sm"
                                onClick={closePdfPreview}
                                className="bg-white/90 hover:bg-white"
                              >
                                ✕ 닫기
                              </Button>
                            </div>
                            <div id="pdf-preview-container" className="w-full h-full" />
                          </>
                        ) : (
                          <div className="flex items-center justify-center h-full">
                            <div className="text-center text-muted-foreground">
                              <FileText className="h-12 w-12 mx-auto mb-2" />
                              <p>미리보기 버튼을 클릭하여 PDF를 확인하세요</p>
                            </div>
                          </div>
                        )}
                      </div>
                    </div>
                  </div>
                )}
              </CardContent>
            </Card>

            <div className="flex justify-between">
              <Button variant="outline" onClick={() => setCurrentStep(3)}>
                이전 단계
              </Button>
              <Button
                onClick={handleFinalSubmit}
                disabled={!generatedPdfUrl || isLoading}
                className="bg-green-600 hover:bg-green-700"
              >
                <Send className="h-4 w-4 mr-2" />
                {isLoading ? '전송 중...' : '최종 전송'}
              </Button>
            </div>
          </TabsContent>
        </Tabs>
      </DialogContent>
    </Dialog>
  )}