import type { NextApiResponse } from 'next'
import type { UploadedFile } from './types'

export function handleProxyError(params: {
  res: NextApiResponse
  error: unknown
  targetEndpoint: string
  hostname: string
  file: UploadedFile
}): void {
  const errorMessage = params.error instanceof Error ? params.error.message : 'Unknown request error'
  const isDnsError = errorMessage.includes('DNS resolution failed') || errorMessage.includes('ENOTFOUND') || errorMessage.includes('EAI_AGAIN')

  console.error('NIP-95 proxy request error:', {
    targetEndpoint: params.targetEndpoint,
    hostname: params.hostname,
    error: errorMessage,
    isDnsError,
    fileSize: params.file.size,
    fileName: params.file.originalFilename,
    suggestion: isDnsError ? 'The server cannot resolve the domain name. Check DNS configuration and network connectivity.' : undefined,
  })

  if (isDnsError) {
    params.res.status(500).json({
      error: `DNS resolution failed for ${params.hostname}. The server cannot resolve the domain name. Please check DNS configuration and network connectivity.`,
    })
    return
  }

  params.res.status(500).json({ error: `Failed to connect to upload endpoint: ${errorMessage}` })
}