class WebSocketClient {
	constructor() {
		this.ws = null;
		this.isConnected = false;
		this.reconnectAttempts = 0;
		this.maxReconnectAttempts = 5;
		this.reconnectInterval = 3000;
		this.messageQueue = [];
		this.onMessageCallback = null;
		this.onErrorCallback = null;
		this.onCloseCallback = null;
		this.onOpenCallback = null;
		this.url = null;
		this.heartbeatTimer = null;
		this.heartbeatInterval = 20000;
		this.heartbeatMessage = 'PING';
		this.lastHeartbeatTime = 0;
		this.heartbeatTimeout = 30000;
		this.connectionPromise = null;
	}

	connect(url, params = {}) {
		// 如果已经有正在进行的连接，返回该连接的Promise
		if (this.connectionPromise) {
			return this.connectionPromise;
		}

		this.connectionPromise = new Promise((resolve, reject) => {
			try {
				const queryString = Object.keys(params)
					.map(key => `${encodeURIComponent(key)}=${encodeURIComponent(params[key])}`)
					.join('&');
				console.log(url,);
				
				const fullUrl = `${url}${queryString ? '?' + queryString : ''}`;
				this.url = fullUrl;
				
				this.ws = uni.connectSocket({
					url: fullUrl,
					success: () => {
						console.log('WebSocket连接成功');
					},
					fail: (error) => {
						console.error('WebSocket连接失败:', error);
						this.connectionPromise = null;
						reject(error);
					}
				});

				this.ws.onOpen(() => {
					console.log('WebSocket已打开');
					this.isConnected = true;
					this.reconnectAttempts = 0;
					this.startHeartbeat();
					// 发送队列中的消息
					while (this.messageQueue.length > 0) {
						const message = this.messageQueue.shift();
						this.send(message);
					}
					resolve();
					if (this.onOpenCallback) {
						this.onOpenCallback();
					}
				});

				this.ws.onMessage((res) => {
					if (res.data === 'PONG'||res.data === 'PING') {
						this.lastHeartbeatTime = Date.now();
						return;
					}
					if (this.onMessageCallback) {
						this.onMessageCallback(res.data);
					}
				});

				this.ws.onError((error) => {
					console.error('WebSocket错误:', error);
					this.isConnected = false;
					this.stopHeartbeat();
					if (this.onErrorCallback) {
						this.onErrorCallback(error);
					}
					this.connectionPromise = null;
					this.reconnect();
				});

				this.ws.onClose(() => {
					console.log('WebSocket已关闭');
					this.isConnected = false;
					this.stopHeartbeat();
					if (this.onCloseCallback) {
						this.onCloseCallback();
					}
					this.connectionPromise = null;
					this.reconnect();
				});

			} catch (error) {
				console.error('WebSocket初始化错误:', error);
				this.connectionPromise = null;
				reject(error);
			}
		});

		return this.connectionPromise;
	}

	startHeartbeat() {
		this.stopHeartbeat();
		this.lastHeartbeatTime = Date.now();
		this.heartbeatTimer = setInterval(() => {
			if (this.isConnected) {
				// 检查上次心跳响应时间
				if (Date.now() - this.lastHeartbeatTime > this.heartbeatTimeout) {
					console.log('心跳超时，准备重连');
					this.reconnect();
					return;
				}
				// 发送心跳
				this.send(this.heartbeatMessage);
			} else {
				this.stopHeartbeat();
			}
		}, this.heartbeatInterval);
	}

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

	reconnect() {
		if (this.reconnectAttempts < this.maxReconnectAttempts) {
			this.reconnectAttempts++;
			console.log(`尝试重新连接 (${this.reconnectAttempts}/${this.maxReconnectAttempts})`);
			setTimeout(() => {
				this.connect(this.url); // 使用保存的URL进行重新连接
			}, this.reconnectInterval);
		}
	}

	async send(message) {
		// 如果未连接，将消息加入队列并尝试连接
		if (!this.isConnected) {
			this.messageQueue.push(message);
			if (!this.connectionPromise) {
				try {
					await this.connect(this.url);
				} catch (error) {
					console.error('发送消息时连接失败:', error);
					return;
				}
			}
			return;
		}

		// 确保连接已建立
		if (this.connectionPromise) {
			try {
				await this.connectionPromise;
			} catch (error) {
				console.error('等待连接建立失败:', error);
				return;
			}
		}

		// 发送消息
		this.ws.send({
			data: message,
			fail: (error) => {
				console.error('发送消息失败:', error);
				this.messageQueue.push(message);
				// 如果发送失败，可能是连接已断开，尝试重连
				if (!this.isConnected) {
					this.reconnect();
				}
			}
		});
	}

	close() {
		this.stopHeartbeat();
		if (this.ws) {
			this.ws.close();
			this.ws = null;
			this.isConnected = false;
		}
	}

	onMessage(callback) {
		this.onMessageCallback = callback;
	}

	onError(callback) {
		this.onErrorCallback = callback;
	}

	onClose(callback) {
		this.onCloseCallback = callback;
	}

	onOpen(callback) { 
		this.onOpenCallback = callback;
	}
}

export default new WebSocketClient();