Momento/memento-note/app/api/mobile/ai/transcribe/route.ts

import { NextRequest, NextResponse } from 'next/server'
import { getMobileUserId } from '@/lib/mobile-auth'
import { getSystemConfig } from '@/lib/config'
import { reserveUsageOrThrow, QuotaExceededError } from '@/lib/entitlements'

export async function POST(req: NextRequest) {
  const userId = await getMobileUserId(req)
  if (!userId) return NextResponse.json({ error: 'Non autorisé' }, { status: 401 })

  const formData = await req.formData().catch(() => null)
  if (!formData) return NextResponse.json({ error: 'Fichier audio requis' }, { status: 400 })

  const file = formData.get('audio')
  if (!file || !(file instanceof Blob)) {
    return NextResponse.json({ error: 'Fichier audio manquant' }, { status: 400 })
  }

  const config = await getSystemConfig()
  const apiKey = config.OPENAI_API_KEY
  if (!apiKey) return NextResponse.json({ error: 'Service non disponible' }, { status: 503 })

  try {
    await reserveUsageOrThrow(userId, 'voice_transcribe')
  } catch (err) {
    if (err instanceof QuotaExceededError) {
      return NextResponse.json(err.toJSON(), { status: 429 })
    }
    throw err
  }

  const whisperForm = new FormData()
  whisperForm.append('file', file, 'audio.m4a')
  whisperForm.append('model', 'whisper-1')
  whisperForm.append('response_format', 'json')

  const whisperRes = await fetch('https://api.openai.com/v1/audio/transcriptions', {
    method: 'POST',
    headers: { Authorization: `Bearer ${apiKey}` },
    body: whisperForm,
  })

  if (!whisperRes.ok) {
    const err = await whisperRes.text()
    console.error('[mobile/ai/transcribe] Whisper error:', err)
    return NextResponse.json({ error: 'Erreur transcription' }, { status: 500 })
  }

  const { text } = await whisperRes.json()
  return NextResponse.json({ text: text ?? '' })
}