function getCookie(name) {
    const value = `; ${document.cookie}`;
    const parts = value.split(`; ${name}=`);
    if (parts.length === 2) return parts.pop().split(';').shift();
    return '';
}

function getScreenCoordinates(clientX, clientY, canvas, screenWidth, screenHeight) {
    const rect = canvas.getBoundingClientRect();
    const canvasX = clientX - rect.left;
    const canvasY = clientY - rect.top;
    
    const scaleX = screenWidth / rect.width;
    const scaleY = screenHeight / rect.height;
    
    const screenX = Math.floor(canvasX * scaleX);
    const screenY = Math.floor(canvasY * scaleY);
    
    return { x: screenX, y: screenY };
}

function createReconnectingWebSocket(url, options = {}) {
    const {
        onOpen = () => {},
        onClose = () => {},
        onMessage = () => {},
        onError = () => {},
        maxDelay = 30000
    } = options;
    
    let ws = null;
    let reconnectDelay = 1000;
    let reconnectTimer = null;
    let isManualClose = false;
    
    function connect() {
        ws = new WebSocket(url);
        
        ws.onopen = () => {
            reconnectDelay = 1000;
            onOpen(ws);
        };
        
        ws.onmessage = (e) => {
            onMessage(e, ws);
        };
        
        ws.onclose = () => {
            onClose();
            if (!isManualClose) {
                reconnectTimer = setTimeout(() => {
                    reconnectDelay = Math.min(reconnectDelay * 2, maxDelay);
                    connect();
                }, reconnectDelay);
            }
        };
        
        ws.onerror = (err) => {
            onError(err);
        };
    }
    
    function close() {
        isManualClose = true;
        if (reconnectTimer) {
            clearTimeout(reconnectTimer);
        }
        if (ws) {
            ws.close();
        }
    }
    
    function getWebSocket() {
        return ws;
    }
    
    function isReady() {
        return ws && ws.readyState === WebSocket.OPEN;
    }
    
    connect();
    
    return {
        getWebSocket,
        isReady,
        close
    };
}