import { WEBSOCKET_BASE_URL } from '@/config/setting';

export default class WebSocketClient {

    constructor(path) {
        this.url = WEBSOCKET_BASE_URL + path;
        this.webSocket = null;
        this.heartbeatInterval = null; // Store the interval ID
        this.heartbeatFrequency = 30000; // Heartbeat every 30 seconds
    }

    connect() {
        if (!this.url) {
            console.error('WebSocketClient: Cannot connect without url.');
            return;
        }

        this.webSocket = new WebSocket(this.url);

        this.webSocket.onopen = (event) => {
            console.log('websocket connection opened.');
            // Start the heartbeat
            this.startHeartbeat();
        };

        this.webSocket.onmessage = (event) => {
            // console.log('websocket message received:', event.data);
            this.onMessage(event.data);
        };

        this.webSocket.onerror = (event) => {
            console.error('websocket error observed:', event);
        };

        this.webSocket.onclose = (event) => {
            console.log('websocket connection closed!');
            // Clear the heartbeat
            this.stopHeartbeat();   
            this.reconnect();
        };
    }

    sendMessage(message) {
        if (this.webSocket && this.webSocket.readyState === WebSocket.OPEN) {
            this.webSocket.send(message);
        } else {
            console.error('WebSocketClient: Cannot send message, WebSocket connection is not open.');
        }
    }

    // Override
    onMessage(data) {
    }

    close() {
        if (this.webSocket && this.webSocket.readyState === WebSocket.OPEN) {
            this.webSocket.close();
        }
    }

    reconnect() {
        setTimeout(() => {
            console.log('WebSocketClient: Attempting to reconnect...');
            this.connect();
        }, 3000);
    }

    startHeartbeat() {
        if(this.heartbeatInterval) {
            clearInterval(this.heartbeatInterval);
        }
        this.heartbeatInterval = setInterval(() => {
            this.sendMessage('1');
        }, this.heartbeatFrequency);
    }

    stopHeartbeat() {
        if (this.heartbeatInterval) {
            clearInterval(this.heartbeatInterval);
            this.heartbeatInterval = null;
        }
    }
}