<?php
require_once 'vendor/autoload.php'; // Install ReactPHP via Composer

use React\Socket\Server;
use React\Http\Server as HttpServer;
use React\Stream\WritableResourceStream;

$loop = React\EventLoop\Loop::get();

// Database connection
$pdo = new PDO("mysql:host=192.168.0.13;dbname=history", "opce", "opcelasuca");

// WebSocket connections
$connections = [];

// Create WebSocket server
$server = new HttpServer($loop, function ($request) use (&$connections, $pdo) {
    // Handle WebSocket upgrade
    if ($request->getHeaderLine('Upgrade') === 'websocket') {
        $connection = new WebSocketConnection();
        $connections[] = $connection;
        
        // Send initial data
        $connection->send(json_encode([
            'type' => 'welcome',
            'message' => 'Connected to real-time data stream'
        ]));
        
        return $connection;
    }
    
    return new React\Http\Response(404, [], 'WebSocket endpoint only');
});

// Periodic data broadcast
$loop->addPeriodicTimer(1.0, function() use (&$connections, $pdo) {
    if (empty($connections)) return;
    
    try {
        // Get latest data for all active tags
        $stmt = $pdo->prepare("
            SELECT h.TimeStamp, h.Value, n.name 
            FROM historicaldata h 
            LEFT JOIN id_names n ON h.ID = n.idnumber 
            WHERE h.TimeStamp >= NOW() - INTERVAL 5 SECOND
            ORDER BY h.TimeStamp DESC
        ");
        $stmt->execute();
        $data = $stmt->fetchAll(PDO::FETCH_ASSOC);
        
        if (!empty($data)) {
            $message = json_encode([
                'type' => 'data_update',
                'timestamp' => date('c'),
                'data' => $data
            ]);
            
            // Broadcast to all connections
            foreach ($connections as $key => $connection) {
                if ($connection->isConnected()) {
                    $connection->send($message);
                } else {
                    unset($connections[$key]);
                }
            }
        }
        
    } catch (Exception $e) {
        error_log("WebSocket error: " . $e->getMessage());
    }
});

$socket = new Server('0.0.0.0:8080', $loop);
$server->listen($socket);

echo "WebSocket server running on port 8080\n";
$loop->run();
?>