import { NextRequest, NextResponse } from 'next/server'
import { v4 as uuidv4 } from 'uuid'

/**
 * POST /api/sdk/v1/vendor-compliance/export
 *
 * Generate and export reports in various formats.
 * Currently returns mock data - integrate with actual report generation service.
 */

interface ExportConfig {
  reportType: 'VVT_EXPORT' | 'VENDOR_AUDIT' | 'ROPA' | 'MANAGEMENT_SUMMARY' | 'DPIA_INPUT'
  format: 'PDF' | 'DOCX' | 'XLSX' | 'JSON'
  scope: {
    vendorIds: string[]
    processingActivityIds: string[]
    includeFindings: boolean
    includeControls: boolean
    includeRiskAssessment: boolean
    dateRange?: {
      from: string
      to: string
    }
  }
}

const REPORT_TYPE_NAMES: Record<ExportConfig['reportType'], string> = {
  VVT_EXPORT: 'Verarbeitungsverzeichnis',
  VENDOR_AUDIT: 'Vendor-Audit-Pack',
  ROPA: 'RoPA',
  MANAGEMENT_SUMMARY: 'Management-Summary',
  DPIA_INPUT: 'DSFA-Input',
}

const FORMAT_EXTENSIONS: Record<ExportConfig['format'], string> = {
  PDF: 'pdf',
  DOCX: 'docx',
  XLSX: 'xlsx',
  JSON: 'json',
}

export async function POST(request: NextRequest) {
  try {
    const config = (await request.json()) as ExportConfig

    // Validate request
    if (!config.reportType || !config.format) {
      return NextResponse.json(
        { error: 'reportType and format are required' },
        { status: 400 }
      )
    }

    // Generate report ID and filename
    const reportId = uuidv4()
    const timestamp = new Date().toISOString().slice(0, 10).replace(/-/g, '')
    const filename = `${REPORT_TYPE_NAMES[config.reportType]}_${timestamp}.${FORMAT_EXTENSIONS[config.format]}`

    // TODO: Implement actual report generation
    // This would typically:
    // 1. Fetch data from database based on scope
    // 2. Generate report using template engine (e.g., docx-templates, pdfkit)
    // 3. Store in MinIO/S3
    // 4. Return download URL

    // Mock implementation - simulate processing time
    await new Promise((resolve) => setTimeout(resolve, 500))

    // In production, this would be a signed URL to MinIO/S3
    const downloadUrl = `/api/sdk/v1/vendor-compliance/export/${reportId}/download`

    // Log export for audit trail
    console.log('Export generated:', {
      reportId,
      reportType: config.reportType,
      format: config.format,
      scope: config.scope,
      filename,
      generatedAt: new Date().toISOString(),
    })

    return NextResponse.json({
      id: reportId,
      reportType: config.reportType,
      format: config.format,
      filename,
      downloadUrl,
      generatedAt: new Date().toISOString(),
      scope: {
        vendorCount: config.scope.vendorIds?.length || 0,
        activityCount: config.scope.processingActivityIds?.length || 0,
        includesFindings: config.scope.includeFindings,
        includesControls: config.scope.includeControls,
        includesRiskAssessment: config.scope.includeRiskAssessment,
      },
    })
  } catch (error) {
    console.error('Export error:', error)
    return NextResponse.json(
      { error: 'Failed to generate export' },
      { status: 500 }
    )
  }
}

/**
 * GET /api/sdk/v1/vendor-compliance/export
 *
 * List recent exports for the current tenant.
 */
export async function GET() {
  // TODO: Implement fetching recent exports from database
  // For now, return empty list
  return NextResponse.json({
    exports: [],
    totalCount: 0,
  })
}
