/**
 * GET /api/print-agent/backup  (Bearer agent token) — latest /etc/cups backup of this agent,
 * or 404. Used by the agent's `restore-cups` step on a re-imaged / replacement box.
 */
import { createReadStream, existsSync, statSync } from 'node:fs'
import { requireAgent } from '../../utils/printAgentAuth'
import { backupPath } from './backup.post'

export default defineEventHandler(async (event) => {
  const agent = requireAgent(event)
  const file = backupPath(agent.id)
  if (!existsSync(file)) throw createError({ statusCode: 404, statusMessage: 'no backup stored for this agent' })
  const st = statSync(file)
  setResponseHeaders(event, {
    'Content-Type': 'application/gzip',
    'Content-Length': String(st.size),
    'Last-Modified': st.mtime.toUTCString(),
    'Cache-Control': 'no-store'
  })
  return sendStream(event, createReadStream(file))
})