const express = require('express');
const cors = require('cors');
const morgan = require('morgan');
const fs = require('fs');
const path = require('path');

const app = express();
const PORT = 3000;
const LOG_FILE = path.join(__dirname, 'detections.json');

// Middleware
app.use(cors());
app.use(morgan('dev'));
app.use(express.json());
app.use(express.static('public'));

// Helper to read/write logs
const getLogs = () => {
    if (!fs.existsSync(LOG_FILE)) return [];
    const data = fs.readFileSync(LOG_FILE);
    return JSON.parse(data);
};

const saveLog = (log) => {
    const logs = getLogs();
    logs.push({ ...log, id: Date.now(), timestamp: new Date() });
    fs.writeFileSync(LOG_FILE, JSON.stringify(logs, null, 2));
};

// API Routes
app.get('/api/detections', (req, res) => {
    res.json(getLogs());
});

app.post('/api/detections', (req, res) => {
    const { label, confidence } = req.body;
    if (!label || !confidence) {
        return res.status(400).json({ error: 'Faltan datos de clasificación' });
    }
    saveLog({ label, confidence });
    res.status(201).json({ message: 'Detección guardada correctamente' });
});

app.listen(PORT, () => {
    console.log(`Servidor Backend ejecutándose en http://localhost:${PORT}`);
});