// lib/vendor-document-list/workflow-service.ts
class WorkflowService {
  /**
   * 워크플로우 상태 조회
   */
  async getWorkflowStatus(
    contractId: number,
    targetSystem: string = 'SWP'
  ): Promise<any> {
    try {
      // 워크플로우 상태를 DB나 외부 시스템에서 조회
      // 실제 구현에서는 workflow_states 테이블이나 외부 API를 사용
      
      const mockStatus = {
        status: 'IDLE',
        lastUpdatedAt: new Date().toISOString(),
        pendingActions: ['SUBMIT_LIST'],
        confirmationData: null,
        revisionComments: [],
        approvalData: null
      }

      return mockStatus

    } catch (error) {
      console.error('Failed to get workflow status:', error)
      throw error
    }
  }

  /**
   * 워크플로우 액션 실행
   */
  async executeWorkflowAction(
    contractId: number,
    targetSystem: string,
    action: string,
    documents: any[],
    userId: number,
    userName: string
  ): Promise<any> {
    try {
      console.log(`Executing workflow action: ${action} for contract ${contractId}`)

      switch (action) {
        case 'SUBMIT_LIST':
          return await this.submitDocumentList(contractId, targetSystem, documents, userId, userName)
        
        case 'CHECK_CONFIRMATION':
          return await this.checkConfirmation(contractId, targetSystem)
        
        case 'RESUBMIT_REVISED':
          return await this.resubmitRevisedList(contractId, targetSystem, documents, userId, userName)
        
        case 'CHECK_APPROVAL':
          return await this.checkApproval(contractId, targetSystem)
        
        default:
          throw new Error(`Unknown workflow action: ${action}`)
      }

    } catch (error) {
      console.error('Workflow action failed:', error)
      throw error
    }
  }

  /**
   * 문서 목록 전송
   */
  private async submitDocumentList(
    contractId: number,
    targetSystem: string,
    documents: any[],
    userId: number,
    userName: string
  ): Promise<any> {
    // SWP 시스템으로 문서 목록 전송
    const endpoint = process.env.SWP_SUBMIT_URL
    if (!endpoint) {
      throw new Error('SWP submit endpoint not configured')
    }

    const payload = {
      contractId,
      documents: documents.map(doc => ({
        documentNo: doc.documentNo,
        documentName: doc.documentName,
        documentType: doc.documentType,
        status: doc.documentStatus
      })),
      submittedBy: userName,
      submittedAt: new Date().toISOString()
    }

    const response = await fetch(endpoint, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Authorization': `Basic ${Buffer.from(`${process.env.SWP_USER}:${process.env.SWP_PASSWORD}`).toString('base64')}`
      },
      body: JSON.stringify(payload)
    })

    if (!response.ok) {
      const errorText = await response.text()
      throw new Error(`SWP submit failed: HTTP ${response.status} - ${errorText}`)
    }

    const result = await response.json()
    
    // 워크플로우 상태 업데이트 (DB 저장)
    // await this.updateWorkflowStatus(contractId, targetSystem, 'SUBMITTED', result)

    return {
      success: true,
      message: '문서 목록이 성공적으로 전송되었습니다.',
      submissionId: result.submissionId
    }
  }

  /**
   * 컨펌 상태 확인
   */
  private async checkConfirmation(
    contractId: number,
    targetSystem: string
  ): Promise<any> {
    // SWP 시스템에서 컨펌 상태 조회
    const endpoint = process.env.SWP_STATUS_URL
    if (!endpoint) {
      throw new Error('SWP status endpoint not configured')
    }

    const response = await fetch(`${endpoint}?contractId=${contractId}`, {
      method: 'GET',
      headers: {
        'Authorization': `Basic ${Buffer.from(`${process.env.SWP_USER}:${process.env.SWP_PASSWORD}`).toString('base64')}`
      }
    })

    if (!response.ok) {
      const errorText = await response.text()
      throw new Error(`SWP status check failed: HTTP ${response.status} - ${errorText}`)
    }

    const result = await response.json()
    
    // 상태에 따른 다음 액션 결정
    let nextStatus = 'UNDER_REVIEW'
    let message = '검토가 진행 중입니다.'

    if (result.status === 'CONFIRMED') {
      nextStatus = 'CONFIRMED'
      message = '문서 목록이 컨펌되었습니다.'
    } else if (result.status === 'REVISION_REQUIRED') {
      nextStatus = 'REVISION_REQUIRED'
      message = '수정이 요청되었습니다.'
    }

    return {
      success: true,
      message,
      status: nextStatus,
      confirmationData: result
    }
  }

  /**
   * 수정된 목록 재전송
   */
  private async resubmitRevisedList(
    contractId: number,
    targetSystem: string,
    documents: any[],
    userId: number,
    userName: string
  ): Promise<any> {
    // 수정된 문서 목록 재전송 로직
    return await this.submitDocumentList(contractId, targetSystem, documents, userId, userName)
  }

  /**
   * 최종 승인 확인
   */
  private async checkApproval(
    contractId: number,
    targetSystem: string
  ): Promise<any> {
    // 최종 승인 상태 확인 로직
    return await this.checkConfirmation(contractId, targetSystem)
  }
}

export const workflowService = new WorkflowService()