/**
 * Say — минимальная версия (только Whisper).
 * Работает: загрузка аудио → транскрибация → текст.
 */

const express = require('express');
const multer  = require('multer');
const fetch   = require('node-fetch');
const FormData = require('form-data');
const path    = require('path');

const PORT = parseInt(process.env.PORT, 10) || 3000;

// --- Конфигурация Whisper ---
const WHISPER_URL   = process.env.WHISPER_URL   || 'https://api.aillm.ru/v1/audio/transcriptions';
const WHISPER_MODEL = process.env.WHISPER_MODEL || 'whisper-large-v3';
const API_KEY       = process.env.API_KEY       || '';

const upload = multer({ storage: multer.memoryStorage() });
const app = express();

// --- Статика ---
app.use(express.static(path.join(__dirname, 'public')));

// --- Роуты ---

// Главная
app.get('/', (_req, res) => {
  res.sendFile(path.join(__dirname, 'public', 'index.html'));
});

// Health
app.get('/health', (_req, res) => {
  res.json({ status: 'ok' });
});

// Whisper: аудио → текст
app.post('/api/speech', upload.single('audio'), async (req, res) => {
  try {
    if (!req.file || !req.file.buffer || req.file.size === 0) {
      return res.status(400).json({ error: 'Нет аудио' });
    }

    const form = new FormData();
    form.append('file', req.file.buffer, {
      filename: 'audio.webm',
      contentType: req.file.mimetype || 'audio/webm',
    });
    form.append('model', WHISPER_MODEL);
    form.append('language', 'ru');

    console.log(`Whisper: отправка ${req.file.size} байт`);

    const resp = await fetch(WHISPER_URL, {
      method: 'POST',
      headers: { Authorization: `Bearer ${API_KEY}` },
      body: form,
    });

    if (!resp.ok) {
      const errText = await resp.text();
      console.error(`Whisper error ${resp.status}: ${errText}`);
      return res.status(500).json({ error: `Whisper: ${resp.status}` });
    }

    const data = await resp.json();
    const text = (data.text || '').trim();

    console.log(`Whisper: распознано "${text}"`);
    res.json({ transcription: text });

  } catch (err) {
    console.error('ERROR:', err.message);
    res.status(500).json({ error: err.message });
  }
});

// --- Запуск ---
app.listen(PORT, () => {
  console.log(`Say (Whisper only) listening on :${PORT}`);
});