require('dotenv').config();
const express = require('express');
const { OpenAI } = require('openai');
const multer = require('multer');
const path = require('path');
const fs = require('fs');

const app = express();
const port = process.env.PORT || 3000;

// Configuration OpenAI
const openai = new OpenAI({
    apiKey: process.env.OPENAI_API_KEY
});

// Middleware
app.use(express.json());
app.use(express.static('public'));
// Middleware CORS (pour développement)
app.use((req, res, next) => {
  res.header('Access-Control-Allow-Origin', '*');
  res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');
  next();
});

// Routes API
app.post('/api/chat', async (req, res) => {
try {
        const completion = await openai.chat.completions.create({
            model: "gpt-4",
            messages: [
                { 
                    role: "system", 
                    content: "Tu es Rosalinda, une assistante IA spécialisée en développement logiciel. Sois concise, technique et utile." 
                },
                { role: "user", content: req.body.message }
            ],
            temperature: 0.7
        });
        res.json({ reply: completion.choices[0].message.content });
    } catch (error) {
        console.error('OpenAI Error:', error);
        res.status(500).json({ error: error.message });
    }
});
app.post('/api/image', async (req, res) => {
try {
        const response = await openai.images.generate({
            prompt: req.body.prompt,
            n: 1,
            size: "1024x1024"
        });
        res.json({ imageUrl: response.data[0].url });
    } catch (error) {
        console.error('DALL-E Error:', error);
        res.status(500).json({ error: error.message });
    }
});

// Configuration pour l'audio
const upload = multer({ dest: 'uploads/' });
app.post('/api/whisper', upload.single('audio'), async (req, res) => {
try {
        const transcription = await openai.audio.transcriptions.create({
            file: fs.createReadStream(req.file.path),
            model: "whisper-1"
        });
        fs.unlinkSync(req.file.path); // Nettoyage
        res.json({ text: transcription.text });
    } catch (error) {
        console.error('Whisper Error:', error);
        res.status(500).json({ error: error.message });
    }
});

// Démarrer le serveur
// Gestion des erreurs 404
app.use((req, res) => {
  res.status(404).json({ error: 'Endpoint non trouvé' });
});

// Gestion des erreurs globales
app.use((err, req, res, next) => {
  console.error(err.stack);
  res.status(500).json({ error: 'Erreur interne du serveur' });
});

app.listen(port, () => {
  console.log(`Serveur backend démarré sur http://localhost:${port}`);
  console.log(`Endpoints disponibles:`);
  console.log(`- POST /api/chat`);
  console.log(`- POST /api/image`); 
  console.log(`- POST /api/whisper`);
});