/**
 * AI问答WebSocket工具函数
 */

// AI WebSocket配置
const AI_WS_CONFIG = {
	baseURL: 'ws://116.62.47.88:5003',
	timeout: 30000, // 30秒超时
	reconnectInterval: 3000, // 重连间隔
	maxReconnectAttempts: 3 // 最大重连次数
};

class AIWebSocket {
	constructor() {
		this.ws = null;
		this.url = '';
		this.connected = false;
		this.connecting = false;
		this.reconnectCount = 0;
		this.lockReconnect = false;
		this.messageCallback = null;
		this.errorCallback = null;
		this.closeCallback = null;
		this.reconnectTimer = null;
		this.heartbeatTimer = null;
		// 最近一次连接的参数，用于必要时重连
		this.lastQuestion = '';
		this.lastOnMessage = null;
		this.lastOnError = null;
		// 是否允许自动重连（默认不重连，避免重复消息）
		this.shouldReconnect = false;
	}

	/**
	 * 连接WebSocket
	 * @param {string} question - 用户问题
	 * @param {Function} onMessage - 消息回调函数
	 * @param {Function} onError - 错误回调函数
	 */
	connect(question, onMessage, onError, onClose) {
		if (this.connecting || this.connected) {
			console.log('WebSocket已连接或正在连接中');
			return;
		}

		// 记录本次连接参数
		this.messageCallback = onMessage;
		this.errorCallback = onError;
		this.lastQuestion = question;
		this.lastOnMessage = onMessage;
		this.lastOnError = onError;
		this.closeCallback = onClose;
		// 默认不自动重连，除非调用方显式开启
		this.shouldReconnect = false;
		this.url = `${AI_WS_CONFIG.baseURL}/ws`;

		try {
			this.connecting = true;
			
			// 创建WebSocket连接
			this.ws = uni.connectSocket({
				url: this.url,
				success: (data) => {
					console.log('AI WebSocket连接创建成功');
				},
				fail: (error) => {
					console.error('AI WebSocket连接创建失败:', error);
					this.handleError('连接创建失败');
				}
			});

			// 监听连接打开
			this.ws.onOpen((res) => {
				console.log('AI WebSocket连接已打开');
				this.connecting = false;
				this.connected = true;
				this.reconnectCount = 0;
				
				// 发送问题
				this.sendQuestion(question);
				
				// 开始心跳检测
				this.startHeartbeat();
			});

			// 监听消息
			this.ws.onMessage((res) => {
				console.log('AI WebSocket收到消息:', res.data);
				
				try {
					const data = JSON.parse(res.data);
					if (this.messageCallback) {
						this.messageCallback(data);
					}
				} catch (error) {
					console.error('解析WebSocket消息失败:', error);
				}
			});

			// 监听错误
			this.ws.onError((res) => {
				console.error('AI WebSocket连接错误:', res);
				this.handleError('连接错误');
			});

			// 监听连接关闭
			this.ws.onClose((res) => {
				console.log('AI WebSocket连接已关闭');
				this.connected = false;
				this.connecting = false;
				this.ws = null;
				
				// 停止心跳
				this.stopHeartbeat();
				
				// 通知外部关闭事件
				if (this.closeCallback) {
					try { this.closeCallback(res); } catch (e) { console.error('关闭回调执行失败', e); }
				}
				
				// 仅在允许时才尝试重连
				if (this.shouldReconnect) {
					this.reconnect();
				}
			});

		} catch (error) {
			console.error('创建AI WebSocket失败:', error);
			this.handleError('创建连接失败');
		}
	}

	/**
	 * 发送问题
	 * @param {string} question - 用户问题
	 */
	sendQuestion(question) {
		if (!this.connected || !this.ws) {
			console.error('WebSocket未连接，无法发送问题');
			return;
		}

		const message = {
			question: question
		};

		this.ws.send({
			data: JSON.stringify(message),
			success: () => {
				console.log('问题发送成功');
			},
			fail: (error) => {
				console.error('问题发送失败:', error);
				this.handleError('发送问题失败');
			}
		});
	}

	/**
	 * 开始心跳检测
	 */
	startHeartbeat() {
		this.heartbeatTimer = setInterval(() => {
			if (this.connected && this.ws) {
				this.ws.send({
					data: JSON.stringify({ type: 'ping' }),
					fail: (error) => {
						console.error('心跳发送失败:', error);
						this.reconnect();
					}
				});
			}
		}, 10000); // 每10秒发送一次心跳
	}

	/**
	 * 停止心跳检测
	 */
	stopHeartbeat() {
		if (this.heartbeatTimer) {
			clearInterval(this.heartbeatTimer);
			this.heartbeatTimer = null;
		}
	}

	/**
	 * 重连
	 */
	reconnect() {
		if (this.lockReconnect || this.reconnectCount >= AI_WS_CONFIG.maxReconnectAttempts) {
			console.log('达到最大重连次数或重连被锁定');
			return;
		}

		this.lockReconnect = true;
		this.reconnectCount++;

		console.log(`尝试重连 (${this.reconnectCount}/${AI_WS_CONFIG.maxReconnectAttempts})`);

		this.reconnectTimer = setTimeout(() => {
			this.lockReconnect = false;
			if (!this.connected) {
				// 使用最近一次的参数重连
				this.connect(this.lastQuestion, this.lastOnMessage, this.lastOnError);
			}
		}, AI_WS_CONFIG.reconnectInterval);
	}

	/**
	 * 处理错误
	 * @param {string} error - 错误信息
	 */
	handleError(error) {
		console.error('AI WebSocket错误:', error);
		if (this.errorCallback) {
			this.errorCallback(error);
		}
	}

	/**
	 * 关闭连接
	 */
	close() {
		console.log('关闭AI WebSocket连接');
		
		// 停止重连
		if (this.reconnectTimer) {
			clearTimeout(this.reconnectTimer);
			this.reconnectTimer = null;
		}
		
		// 主动关闭时不再重连
		this.shouldReconnect = false;
		
		// 停止心跳
		this.stopHeartbeat();
		
		// 关闭WebSocket
		if (this.ws && this.connected) {
			this.ws.close();
		}
		
		// 重置状态
		this.connected = false;
		this.connecting = false;
		this.ws = null;
		this.lockReconnect = false;
		this.reconnectCount = 0;
		this.messageCallback = null;
		this.errorCallback = null;
	}

	/**
	 * 启用或禁用自动重连
	 * @param {boolean} enable 是否启用
	 */
	setAutoReconnect(enable) {
		this.shouldReconnect = !!enable;
	}

	/**
	 * 检查连接状态
	 * @returns {boolean} 是否已连接
	 */
	isConnected() {
		return this.connected;
	}
}

// 创建单例实例
const aiWebSocket = new AIWebSocket();

export default aiWebSocket;