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

import { NextResponse } from 'next/server'
import Groq from 'groq-sdk'
import { HttpsProxyAgent } from 'https-proxy-agent'
import { toFile } from 'groq-sdk/uploads'

const STT_MODEL = process.env.GROQ_STT_MODEL || 'whisper-large-v3-turbo'

let _client: Groq | null = null
function client(): Groq {
  if (_client) return _client
  const apiKey = process.env.GROQ_API_KEY
  if (!apiKey) throw new Error('GROQ_API_KEY not set')
  const proxy = process.env.GROQ_PROXY || process.env.HTTPS_PROXY || ''
  const httpAgent = proxy ? new HttpsProxyAgent(proxy) : undefined
  _client = new Groq({ apiKey, httpAgent })
  return _client
}

// Принимает либо multipart/form-data с полем "file",
// либо raw audio в теле (Content-Type: audio/* — например audio/webm).
// Возвращает {text: string}.
export async function POST(req: Request) {
  let audio: { name: string; data: Buffer; mime: string }

  const ct = req.headers.get('content-type') || ''

  try {
    if (ct.startsWith('multipart/form-data')) {
      const fd = await req.formData()
      const file = fd.get('file')
      if (!(file instanceof Blob)) {
        return NextResponse.json({ error: 'file field required' }, { status: 400 })
      }
      const ab = await file.arrayBuffer()
      audio = {
        name: (file as any).name || 'audio.webm',
        data: Buffer.from(ab),
        mime: file.type || 'audio/webm',
      }
    } else {
      const ab = await req.arrayBuffer()
      if (!ab.byteLength) {
        return NextResponse.json({ error: 'empty body' }, { status: 400 })
      }
      audio = {
        name: 'audio.webm',
        data: Buffer.from(ab),
        mime: ct || 'audio/webm',
      }
    }
  } catch (e) {
    return NextResponse.json({ error: 'failed_to_read_body' }, { status: 400 })
  }

  try {
    const file = await toFile(audio.data, audio.name, { type: audio.mime })
    const result = await client().audio.transcriptions.create({
      file,
      model: STT_MODEL,
      language: 'ru',
    })
    const text = (result as any).text || ''
    return NextResponse.json({ text })
  } catch (e: any) {
    console.error('[voice/stt] groq error:', e?.message || e)
    return NextResponse.json({ error: 'stt_failed', detail: String(e?.message || e) }, { status: 502 })
  }
}