// import { EventDispatcher } from './dispatcher';

export class WebSocketClient extends EventDispatcher {
    // #socket链接
    url = '';
    // #socket实例
    socket = null;
    // #重连次数
    reconnectAttempts = 0;
    // #最大重连数
    maxReconnectAttempts = 5;
    // #重连间隔
    reconnectInterval = 10000; // 10 seconds
    // #发送心跳数据间隔
    heartbeatInterval = 1000 * 30;
    // #计时器id
    heartbeatTimer = undefined;
    // #彻底终止ws
    stopWs = false;
    // *构造函数
    constructor(url) {
        super();
        this.url = url;
    }
    // >生命周期钩子
    onopen(callBack) {
        this.addEventListener('open', callBack);
    }
    onmessage(callBack) {
        this.addEventListener('message', callBack);
    }
    onclose(callBack) {
        this.addEventListener('close', callBack);
    }
    onerror(callBack) {
        this.addEventListener('error', callBack);
    }
    // >消息发送
    send(message) {
        if (this.socket && this.socket.readyState === WebSocket.OPEN) {
            this.socket.send(message);
        } else {
            console.error('[WebSocket] 未连接');
        }
    }

    // !初始化连接
    connect() {
        if (this.reconnectAttempts === 0) {
            this.log('WebSocket', `初始化连接中...          ${this.url}`);
        }
        if (this.socket && this.socket.readyState === WebSocket.OPEN) {
            return;
        }
        this.socket = new WebSocket(this.url);

        // !websocket连接成功
        this.socket.onopen = event => {
            this.stopWs = false;
            // 重置重连尝试成功连接
            this.reconnectAttempts = 0;
            // 在连接成功时停止当前的心跳检测并重新启动
            this.startHeartbeat();
            this.log('WebSocket', `连接成功,等待服务端数据推送[onopen]...     ${this.url}`);
            this.dispatchEvent('open', event);
        };

        this.socket.onmessage = event => {
            this.dispatchEvent('message', event);
            this.startHeartbeat();
        };

        this.socket.onclose = event => {
            if (this.reconnectAttempts === 0) {
                this.log('WebSocket', `连接断开[onclose]...    ${this.url}`);
            }
            if (!this.stopWs) {
                this.handleReconnect();
            }
            this.dispatchEvent('close', event);
        };

        this.socket.onerror = event => {
            if (this.reconnectAttempts === 0) {
                this.log('WebSocket', `连接异常[onerror]...    ${this.url}`);
            }
            this.closeHeartbeat();
            this.dispatchEvent('error', event);
        };
    }

    // > 断网重连逻辑
    handleReconnect() {
        if (this.reconnectAttempts < this.maxReconnectAttempts) {
            this.reconnectAttempts++;
            this.log('WebSocket', `尝试重连... (${this.reconnectAttempts}/${this.maxReconnectAttempts})       ${this.url}`);
            setTimeout(() => {
                this.connect();
            }, this.reconnectInterval);
        } else {
            this.closeHeartbeat();
            this.log('WebSocket', `最大重连失败，终止重连: ${this.url}`);
        }
    }

    // >关闭连接
    close() {
        if (this.socket) {
            this.stopWs = true;
            this.socket.close();
            this.socket = null;
            this.removeEventListener('open');
            this.removeEventListener('message');
            this.removeEventListener('close');
            this.removeEventListener('error');
        }
        this.closeHeartbeat();
    }

    // >开始心跳检测 -> 定时发送心跳消息
    startHeartbeat() {
        if (this.stopWs) return;
        if (this.heartbeatTimer) {
            this.closeHeartbeat();
        }
        this.heartbeatTimer = setInterval(() => {
            if (this.socket) {
                this.socket.send(JSON.stringify({ type: 'heartBeat', data: {} }));
                this.log('WebSocket', '送心跳数据...');
            } else {
                console.error('[WebSocket] 未连接');
            }
        }, this.heartbeatInterval);
    }

    // >关闭心跳
    closeHeartbeat() {
        clearInterval(this.heartbeatTimer);
        this.heartbeatTimer = undefined;
    }
}