// Simple server-side event receiver (Node.js example)
// Save as: server/index.js

const express = require('express');
const crypto = require('crypto');

const app = express();
app.use(express.json());

// In-memory store (use Redis/DB in production)
const events = [];
const routers = new Map();

// Authentication middleware
function authenticate(req, res, next) {
    const token = req.headers.authorization?.replace('Bearer ', '');
    
    if (!token || token !== process.env.EVENT_TOKEN) {
        return res.status(401).json({ error: 'Unauthorized' });
    }
    next();
}

// Event endpoint
app.post('/api/events', authenticate, (req, res) => {
    const event = {
        id: crypto.randomUUID(),
        ...req.body,
        received_at: new Date().toISOString()
    };
    
    // Store
    events.push(event);
    if (events.length > 10000) events.shift();
    
    // Track router
    routers.set(event.router_id, {
        last_seen: new Date(),
        last_event: event.event_type
    });
    
    // Log
    console.log(`[${event.router_id}] ${event.event_type}`, event.payload);
    
    // Emit real-time (WebSocket)
    // io.emit('event', event);
    
    res.json({ success: true, event_id: event.id });
});

// routers endpoint
app.get('/api/routers', (req, res) => {
    const online = Array.from(routers.entries()).map(([id, data]) => ({
        id,
        ...data,
        online: (Date.now() - data.last_seen < 300000) // 5 min
    }));
    res.json({ routers: online });
});

// events endpoint
app.get('/api/events', (req, res) => {
    const limit = parseInt(req.query.limit) || 100;
    const type = req.query.type;
    
    let filtered = events;
    if (type) filtered = events.filter(e => e.event_type === type);
    
    res.json({ 
        events: filtered.slice(-limit),
        total: filtered.length
    });
});

// Health check
app.get('/health', (req, res) => {
    res.json({ 
        status: 'ok', 
        events: events.length,
        routers: routers.size 
    });
});

const PORT = process.env.PORT || 3000;
app.listen(PORT, () => {
    console.log(`📡 Event server listening on port ${PORT}`);
});