// Author: Dr Hamid MADANI <drmdh@msn.com>
//
// POST /api/record/audio/done — finalise the session (no-op for append-only writes).
// Returns the URL where the recorded file can be fetched.

import { NextRequest, NextResponse } from 'next/server'
import { promises as fs } from 'fs'
import path from 'path'

export const runtime = 'nodejs'
export const dynamic = 'force-dynamic'

const ROOT = path.join(process.cwd(), 'data', 'records')
const SAFE = /^[a-zA-Z0-9_-]{1,128}$/

export async function POST(req: NextRequest) {
  const sessionId = req.headers.get('x-session-id')
  if (!sessionId || !SAFE.test(sessionId)) {
    return NextResponse.json({ error: 'invalid X-Session-Id' }, { status: 400 })
  }
  // Detect which extension was actually written
  let ext: 'webm' | 'ogg' = 'webm'
  try { await fs.access(path.join(ROOT, `${sessionId}.ogg`)); ext = 'ogg' } catch {}
  return NextResponse.json({ ok: true, url: `/api/record/audio/${sessionId}?ext=${ext}` })
}