app.js

// --- Core Modules ---
const express = require("express");
const cors = require("cors");
const { Pool } = require('pg'); 
const dotenv = require("dotenv");
dotenv.config();

// --- Third-Party Integrations ---
const stripe = require("stripe")(process.env.STRIPE_KEY); 

// ------------------------------------------------------------------
// ⭐ 1. MOVE THIS SECTION UP! - App Setup and Middleware must come first
// ------------------------------------------------------------------
const app = express();
app.use(express.json());


// --- CORS Configuration (IMPORTANT) ---
const allowedOrigins = process.env.CORS_ORIGIN ? process.env.CORS_ORIGIN.split(',') : ['http://localhost:3000'];

app.use(cors({
    origin: function (origin, callback) {
        if (!origin) return callback(null, true);
        if (allowedOrigins.indexOf(origin) === -1) {
            const msg = 'The CORS policy for this site does not allow access from the specified Origin.';
            return callback(new Error(msg), false);
        }
        return callback(null, true);
    }
}));


// ------------------------------------------------------------------
// ⭐ 2. Database Connection - Can stay here or move up/down slightly
// ------------------------------------------------------------------
const pool = new Pool({
    connectionString: process.env.DATABASE_URL, 
    ssl: {
        rejectUnauthorized: false 
    }
});

// Test the connection on startup
pool.connect()
    .then(client => {
        console.log('PostgreSQL connected successfully!');
        client.release(); 
    })
    .catch(err => console.error('PostgreSQL connection error:', err.stack));


// --- Test Route ---
app.get("/", (req, res) => {
    res.status(200).json({
        message: "Successfuly loaded! The server is running and database is connected.",
    });
});


// --- Your Existing Stripe Payment Route ---
app.post("/payment/create", async (req, res) => {
    const total = parseInt(req.query.total);
    if (total > 0) {
        const paymentIntent = await stripe.paymentIntents.create({
            amount: total,
            currency: "usd",
        });

        res.status(201).json({
            clientSecret: paymentIntent.client_secret,
        });
    } else {
        res.status(403).json({ 
            message: "Total payment must be greater than zero" 
        });
    }
});


// --- App Listen ---
const PORT = process.env.PORT || 3000;
app.listen(PORT, (err) => {
    if (err) throw err;
    console.log(`Server is running on http://localhost:${PORT}`);
});