const express = require('express');
const cors = require('cors');
const { db } = require('./firebase');
const app = express();

app.use(cors());
app.use(express.json());

const PORT = process.env.PORT || 7860; // HF Spaces default port

// Health check
app.get('/', (req, res) => {
    res.send('Neon Echo Game Server is Running');
});

// Submit Score Endpoint
app.post('/api/score', async (req, res) => {
    try {
        const { score, name, photoURL, uid, token } = req.body;

        if (!uid || typeof score !== 'number') {
            return res.status(400).json({ error: 'Invalid data' });
        }

        const appId = 'neon-echo-default';

        // Write to Firestore securely via Admin SDK
        await db.collection('artifacts').doc(appId)
            .collection('public').doc('data')
            .collection('leaderboard').collection('scores')
            .add({
                name: name || 'Anonymous',
                score: score,
                photoURL: photoURL || null,
                uid: uid,
                timestamp: new Date() // Server-side timestamp
            });

        res.json({ success: true, message: 'Score saved' });
    } catch (error) {
        console.error('Error saving score:', error);
        res.status(500).json({ error: 'Internal Server Error' });
    }
});

// Get Leaderboard Endpoint
app.get('/api/leaderboard', async (req, res) => {
    try {
        const appId = 'neon-echo-default';
        const snapshot = await db.collection('artifacts').doc(appId)
            .collection('public').doc('data')
            .collection('leaderboard').collection('scores')
            .orderBy('score', 'desc')
            .limit(50)
            .get();

        const scores = [];
        snapshot.forEach(doc => scores.push(doc.data()));
        res.json(scores);
    } catch (error) {
        console.error(error);
        res.status(500).send('Error');
    }
});

app.listen(PORT, () => {
    console.log(`Server running on port ${PORT}`);
});