const express = require('express');
const cors = require('cors');
const app = express();

app.use(cors());

let requestCount = 0;
let lastResponseTime = 0;

app.use((req, res, next) => {
    requestCount++;
    const start = Date.now();
    res.on('finish', () => {
        lastResponseTime = Date.now() - start;
    });
    next();
});

app.get('/health', (req, res) => {
    res.json({
        status: 'Online',
        uptime_seconds: process.uptime(),
        request_count: requestCount,
        response_time_ms: lastResponseTime
    });
});

app.get('/', (req, res) => {
    res.send('Welcome to the Backend API!');
});

const PORT = process.env.PORT || 3000;
app.listen(PORT, () => {
    console.log(`API is running on port ${PORT}`);
});