import {
	ref,
	onMounted,
	onBeforeUnmount
} from 'vue';

const useWebSocket = (options = {}) => {
	const {
		heartbeatInterval = 10000, //心跳是10秒一次
			reconnectInterval = 3000, //重新连接间隔时间的一个参数
			maxReconnectAttempts = 3, //最大重连接次数
			initialReconnectInterval = 3000, // 初始重连间隔
			initMessage,
			initMessageRetryCount = 3, // 新增：初始化消息发送重试次数
			initMessageRetryInterval = 2000, // 新增：初始化消息重试间隔
			maxReconnectDuration = Infinity
	} = options;

	const autoReconnect = ref(true); //是否自动重新连接
	const socketTask = ref(null);
	const isConnected = ref(false); //表示是否已连接上。
	const heartbeatTimer = ref(null); //心跳定时器
	const reconnectTimer = ref(null); //重连定时器
	const reconnectAttempts = ref(0); //重连的尝试次数
	const isNetworkConnected = ref(true); //监听当前网络连接状态
	const isManuallyClosed = ref(false); //是否是被手动关闭的
	const receivedMessages = ref([]); //储从 WebSocket 服务器接收到的消息
	const initMessageSendAttempts = ref(0); //初始化连接多少次
	const reconnectStartTime = ref(0); //新增：记录重连开始时间

	// 关闭现有连接并清理资源
	const closeExistingConnection = () => {
		if (socketTask.value) {
			// 关闭 WebSocket 连接
			socketTask.value.close({
				success: () => {
					console.log('WebSocket 连接已关闭');
				},
				fail: (err) => {
					console.error('关闭 WebSocket 连接失败:', err);
				}
			});

			// 清除心跳定时器
			clearInterval(heartbeatTimer.value);
			heartbeatTimer.value = null;

			// 清除重连定时器
			clearTimeout(reconnectTimer.value);
			reconnectTimer.value = null;

			// 标记连接已断开
			isConnected.value = false;
		}
	};

	// 连接 WebSocket
	const connect = () => {

		if (!isNetworkConnected.value) {
			uni.showToast({
				title: '网络未连接...',
				icon: 'none'
			})
			setTimeout(() => {
				uni.navigateBack()
			}, 1000)
			console.log('网络未连接，暂不尝试连接 WebSocket');
			return;
		}

		// 关闭现有连接并清理资源
		closeExistingConnection();

		socketTask.value = uni.connectSocket({
			url: uni.conf.baseUrlwws,
			success: (res) => {
				isConnected.value = true;
				reconnectAttempts.value = 0;
				// 监听初始化成功在开启心跳
				startHeartbeat();
			},
			fail: () => {
				console.error('WebSocket 连接失败，尝试重连');
				if (autoReconnect.value) {
					handleReconnect();
				}
			}
		});

		if (socketTask.value) {
			socketTask.value.onOpen(() => {
				// 初始化 初始购物车
				sendMessage(initMessage)
			});
			socketTask.value.onMessage((res) => {
				let list = JSON.parse(res.data)
				console.log(list, 'receivedMessages.value')
				receivedMessages.value.push(list);
				if (res.msg == 'ok') {
					console.log('心跳响应正常');
					// 心跳正常，重置重连尝试次数
					reconnectAttempts.value = 0;
					clearTimeout(reconnectTimer.value);
				}
			});

			socketTask.value.onClose((res) => {
				console.log(res, 'WebSocket 连接已关闭，尝试重连');
				isConnected.value = false;
				clearInterval(heartbeatTimer.value); // 停止心跳定时器
				clearTimeout(reconnectTimer.value); // 清除重连定时器
				if (res.code == '1006') {
					console.log('服务器正常关闭，停止重连');
					uni.navigateBack()
					autoReconnect.value = false;
					return false;
				}
				if (autoReconnect.value && !isManuallyClosed.value) {
					handleReconnect();
				}
			});

			socketTask.value.onError((err) => {
				console.error('WebSocket 连接发生错误:', err);
				isConnected.value = false;
				clearInterval(heartbeatTimer.value);
				if (autoReconnect.value && !isManuallyClosed.value) {
					handleReconnect();
				}
			});
		} else {
			console.error('socketTask 未正确初始化');
		}
	};

	// 启动心跳机制
	const startHeartbeat = () => {
		if (!isNetworkConnected.value) {
			console.log('网络未连接，暂停心跳');
			uni.showToast({
				title: '网络未连接...',
				icon: 'none'
			})
			setTimeout(() => {
				uni.navigateBack()
			}, 1000)
			return;
		}
		heartbeatTimer.value = setInterval(() => {
			if (isConnected.value) {
				socketTask.value.send({
					data: JSON.stringify({
						type: 'ping_interval'
					}),
					success: () => {
						console.log('心跳消息发送成功');
						const pongTimer = setTimeout(() => {
							console.error('心跳超时，未收到响应，尝试重连');
							clearInterval(heartbeatTimer.value);
							if (autoReconnect) {
								handleReconnect();
							}
						}, heartbeatInterval * 1.2);

						socketTask.value.onMessage((res) => {
							if (res.msg == 'ok') {
								clearTimeout(pongTimer);
							}
						});
					},
					fail: () => {
						console.error('心跳消息发送失败，尝试重连');
						clearInterval(heartbeatTimer.value);
						if (autoReconnect) {
							handleReconnect();
						}
					}
				});
			}
		}, heartbeatInterval);
	};

	// 手动关闭连接
	const closeSocket = () => {
		isManuallyClosed.value = true;
		uni.navigateBack()
		closeExistingConnection();
	};

	// 发送消息
	const sendMessage = async (data) => {
		if (isConnected.value) {
			await socketTask.value.send({
				data: JSON.stringify(data),
				success: () => {
					// console.log('消息发送成功');
				},
				fail: () => {
					// console.error('消息发送失败');
				}
			});
		} else {
			console.error('WebSocket 未连接，无法发送消息');
		}
	};

	// 处理重连逻辑
	const handleReconnect = () => {
		if (!isNetworkConnected.value) {
			console.log('网络未连接，暂停重连');
			return;
		}
		if (isManuallyClosed.value) {
			console.log('手动关闭连接，不进行重连');
			return;
		}

		if (reconnectAttempts.value < maxReconnectAttempts) {
			reconnectAttempts.value++;
			const reconnectInterval = initialReconnectInterval * Math.pow(2, reconnectAttempts.value - 1);
			const randomizedInterval = reconnectInterval + Math.floor(Math.random() * 1000);
			console.log(`尝试第 ${reconnectAttempts.value} 次重连，重连间隔: ${randomizedInterval}ms...`);
			reconnectTimer.value = setTimeout(() => {
				connect();
			}, randomizedInterval);
		} else {
			console.error('重连次数达到上限，停止重连');
			uni.showToast({
				title: '重连次数达到上限，停止重连',
				icon: 'none'
			});
			uni.navigateBack()
		}
	};

	// 发送初始化消息
	const sendInitMessage = async () => {
		if (initMessageSendAttempts.value < initMessageRetryCount) {
			initMessageSendAttempts.value++;
			await socketTask.value.send({
				data: JSON.stringify(initMessage),
				success: () => {
					console.log('初始化消息发送成功');
					initMessageSendAttempts.value = 0; // 重置尝试次数
				},
				fail: () => {
					console.log(
						`初始化消息发送失败，第 ${initMessageSendAttempts.value} 次尝试，将在 ${initMessageRetryInterval} 后重试`
					);
					setTimeout(() => {
						sendInitMessage();
					}, initMessageRetryInterval);
				}
			});
		} else {
			console.error('初始化消息发送失败，已达到最大重试次数');
			// initMessageSendAttempts.value = 0; // 重置尝试次数
		}
	};


	// 网络状态监听
	const initNetworkListener = () => {
		uni.getSystemInfo({
			success: (res) => {
				if (res.platform !== 'devtools') {
					uni.onNetworkStatusChange((statusRes) => {
						isNetworkConnected.value = statusRes.isConnected;
						if (statusRes.isConnected && !isManuallyClosed.value) {
							console.log('网络已连接，尝试重新连接 WebSocket');
							if (!isConnected.value && autoReconnect.value) {
								connect();
							}
						} else if (!statusRes.isConnected) {
							console.log('网络已断开，暂停 WebSocket 操作');
							clearInterval(heartbeatTimer.value);
							clearTimeout(reconnectTimer.value);
							if (socketTask.value) {
								socketTask.value.close();
								isConnected.value = false;
							}
						}
					});
				}
			},
			fail: (err) => {
				console.error('获取系统信息失败:', err);
			}
		});

		uni.getNetworkType({
			success: (res) => {
				isNetworkConnected.value = res.networkType !== 'none';
				if (!isNetworkConnected.value) {
					console.log('初始网络未连接，暂不尝试连接 WebSocket');
				}
			}
		});
	};

	onMounted(() => {
		initNetworkListener();
		connect();
	});

	onBeforeUnmount(() => {
		closeSocket();
	});

	return {
		isConnected,
		sendMessage,
		closeSocket,
		receivedMessages
	};
};

export default useWebSocket;