class WebSocketUtil {
    /**
     * 构造函数，初始化 WebSocket 连接参数
     * @param {string} url WebSocket 服务器地址
     */
    constructor(url) {
        this.url = url;
        this.websocket = null;
        this.onOpenCallback = null;
        this.onMessageCallback = null;
        this.onErrorCallback = null;
        this.onCloseCallback = null;
    }

    /**
     * 连接 WebSocket 服务器
     */
    connect() {
        if (this.websocket) {
            StaticLogger.info("WebSocket connect","WebSocket 已经初始化。")
            return;
        }
        this.websocket = new WebSocket(this.url);

        // 监听 WebSocket 连接成功事件
        this.websocket.onopen = (event) => {
            StaticLogger.info("WebSocket onopen","WebSocket 连接已打开。")
            if (this.onOpenCallback) this.onOpenCallback(event);
        };

        // 监听 WebSocket 接收到消息事件
        this.websocket.onmessage = (event) => {
            StaticLogger.info("WebSocket onmessage","WebSocket 接收到消息事件:"+ decodeMessage(event.data).realtimeText);
            if (this.onMessageCallback) this.onMessageCallback(event);
        };

        // 监听 WebSocket 发生错误事件
        this.websocket.onerror = (event) => {
            StaticLogger.error("WebSocket onerror","WebSocket 发生错误:")
            if (this.onErrorCallback) this.onErrorCallback(event);
        };

        // 监听 WebSocket 连接关闭事件
        this.websocket.onclose = (event) => {
            StaticLogger.info("WebSocket onclose","WebSocket 连接已关闭:")
            if (this.onCloseCallback) this.onCloseCallback(event);
        };
    }

    /**
     * 发送消息到 WebSocket 服务器
     * @param {string} message 需要发送的消息
     */
    send(message) {
        StaticLogger.info("WebSocket send","WebSocket 发送消息")
        if (this.websocket && this.websocket.readyState === WebSocket.OPEN) {
            this.websocket.send(message);
        } else {
            StaticLogger.warn("WebSocket send","WebSocket 连接未打开，无法发送消息。")
        }
    }

    /**
     * 关闭 WebSocket 连接
     */
    close() {
        if (this.websocket) {
            this.websocket.close();
        }
    }

    /**
     * 设置 WebSocket 连接成功时的回调函数
     * @param {function} callback 连接成功的回调函数
     */
    onOpen(callback) {
        this.onOpenCallback = callback;
    }

    /**
     * 设置 WebSocket 接收到消息时的回调函数
     * @param {function} callback 消息接收的回调函数
     */
    onMessage(callback) {
        this.onMessageCallback = callback;
    }

    /**
     * 设置 WebSocket 发生错误时的回调函数
     * @param {function} callback 发生错误的回调函数
     */
    onError(callback) {
        this.onErrorCallback = callback;
    }

    /**
     * 设置 WebSocket 连接关闭时的回调函数
     * @param {function} callback 连接关闭的回调函数
     */
    onClose(callback) {
        this.onCloseCallback = callback;
    }
}