using System;
using System.Collections.Concurrent;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;
using GraphQL.Client.Http;
using GraphQL.Transport;
using GraphQL.Client.Serializer.Newtonsoft;
using GraphQL.Client.Abstractions;
using MQTTnet;
using MQTTnet.Client;
using System.Net.Http.Headers;
using LY.App.Common.Redis;
using LY.App.Model;
using Newtonsoft.Json;
using StackExchange.Redis;
using LY.App.Common.HttpUtil;
using LY.App.Device.Command;
using LY.App.Service;

namespace LY.App.Device
{
    public enum ProtocolType
    {
        TCP,
        UDP,
        GraphQL,
        MQTT
    }

    public class Device
    {
        public long Id { get; set; }
        public ProtocolType Protocol { get; set; }
        public string IpAddress { get; set; }
        public int Port { get; set; }
        public string GraphQlEndpoint { get; set; }
        public bool IsConnected { get; set; }
        public string BrokerAddress { get; set; }  // MQTT Broker 地址
        public string Topic { get; set; }          // MQTT 主题
        public string username { get; set; }       // MQTT 用户名
        public string password { get; set; }       // MQTT 密码
        /// <summary>
        /// 数据接收事件
        /// </summary>
        public Action<string> DataReceived { get; set; }
    }

    public class DeviceManager
    {
        private readonly ConcurrentDictionary<long, Device> _devices = new();
        private readonly ConcurrentDictionary<long, IMqttClient> _mqttClients = new(); // 维护 MQTT 客户端
        private static DeviceManager _instance;
        private readonly RedisService _redis = ServiceLocator.Instance.GetService<RedisService>();
        private static readonly object _lock = new object();
        private readonly CancellationTokenSource _monitorCancellationTokenSource = new();
        private readonly LogService _log = ServiceLocator.Instance.GetService<LogService>();
        private DeviceManager()
        {

            Task.Run(() => MonitorDevices(_monitorCancellationTokenSource.Token));
        }
        public static DeviceManager Instance
        {
            get
            {
                lock (_lock)
                {
                    if (_instance == null)
                    {
                        _instance = new DeviceManager();
                    }
                    return _instance;
                }
            }
        }

        public void AddDevice(Device device)
        {
            if (_devices.TryAdd(device.Id, device))
            {
                switch (device.Protocol)
                {
                    case ProtocolType.TCP:
                        Task.Run(() => HandleTcpDevice(device));
                        break;
                    case ProtocolType.UDP:
                        Task.Run(() => HandleUdpDevice(device));
                        break;
                    case ProtocolType.GraphQL:
                        Task.Run(() => HandleGraphQLDevice(device));
                        break;
                    case ProtocolType.MQTT:
                        Task.Run(() => HandleMqttDevice(device));
                        break;
                }
            }
        }

        public async void RemoveDevice(long deviceId)
        {
            if (_devices.TryRemove(deviceId, out var device))
            {
                device.IsConnected = false; // 终止接收数据的循环

                // 对于 MQTT 协议，断开客户端连接并清理
                if (device.Protocol == ProtocolType.MQTT && _mqttClients.TryRemove(deviceId, out var mqttClient))
                {
                    try
                    {
                        if (mqttClient.IsConnected)
                        {
                            await mqttClient.DisconnectAsync();
                        }
                        mqttClient.Dispose();
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine($"设备 {deviceId} 断开 MQTT 连接时出错: {ex.Message}");
                    }
                }
            }
        }

        public ConcurrentDictionary<long, Device> GetAllDevices()
        {
            return _devices;
        }

        /// <summary>
        /// 下发命令
        /// </summary>
        /// <param name="deviceId"></param>
        /// <param name="command"></param>
        /// <returns></returns>
        /// <exception cref="Exception"></exception>
        public async Task SendCommand(long deviceId, string command)
        {
            if (_devices.TryGetValue(deviceId, out var device))
            {
                var data = Encoding.UTF8.GetBytes(command);
                switch (device.Protocol)
                {
                    case ProtocolType.TCP:
                        using (var client = new TcpClient())
                        {
                            await client.ConnectAsync(device.IpAddress, device.Port);
                            var stream = client.GetStream();
                            await stream.WriteAsync(data, 0, data.Length);
                        }
                        break;
                    case ProtocolType.UDP:
                        using (var udpClient = new UdpClient())
                        {
                            await udpClient.SendAsync(data, data.Length, device.IpAddress, device.Port);
                        }
                        break;
                    case ProtocolType.GraphQL:
                        using (var graphQLClient = new GraphQLHttpClient(device.GraphQlEndpoint, new NewtonsoftJsonSerializer()))
                        {
                            var token = await _redis.GetAsync<string>(RedisKeyList.DeviceTokenById(deviceId));
                            var response = await Send<dynamic>(device.GraphQlEndpoint, token, command);
                        }
                        break;
                    case ProtocolType.MQTT:
                        if (_mqttClients.TryGetValue(deviceId, out var mqttClient) && mqttClient.IsConnected)
                        {
                            var message = new MqttApplicationMessageBuilder()
                                .WithTopic(device.Topic)
                                .WithPayload(data)
                                .Build();
                            await mqttClient.PublishAsync(message);
                            Console.WriteLine($"设备 {deviceId} (MQTT) 发送命令 {command} 成功");
                        }
                        else
                        {
                            throw new Exception("MQTT 客户端未连接");
                        }
                        break;
                }
            }
        }

        private async Task HandleTcpDevice(Device device)
        {
            try
            {
                using var client = new TcpClient();
                await client.ConnectAsync(device.IpAddress, device.Port);
                device.IsConnected = true;
                var buffer = new byte[1024];
                var stream = client.GetStream();

                while (device.IsConnected)
                {
                    var bytesRead = await stream.ReadAsync(buffer, 0, buffer.Length);
                    if (bytesRead > 0)
                    {
                        var data = Encoding.UTF8.GetString(buffer, 0, bytesRead);
                        device.DataReceived?.Invoke(data);
                    }
                }
            }
            catch (Exception)
            {
                device.IsConnected = false;
            }
        }

        private async Task HandleUdpDevice(Device device)
        {
            using var udpClient = new UdpClient(device.Port);
            device.IsConnected = true;

            while (device.IsConnected)
            {
                var result = await udpClient.ReceiveAsync();
                var data = Encoding.UTF8.GetString(result.Buffer);
                device.DataReceived?.Invoke(data);
            }
        }

        private async Task HandleGraphQLDevice(Device device)
        {
            try
            {
                var user = new
                {
                    device.username,
                    device.password
                };
                var jsonstr = JsonConvert.SerializeObject(user);
                //登陆 历正设备，获取token
                var loginUrl = $"https://{device.IpAddress}/login";
                var req = await RequestUtil.PostAsync(loginUrl, jsonstr);
                if (req != null)
                {
                    var userinfo = JsonConvert.DeserializeObject<Dto.LoginModel>(req);
                    if (userinfo != null)
                    {
                        Console.WriteLine($"设备 {device.Id} 连接成功");
                        string token = userinfo.token;
                        device.IsConnected = true;
                        await _redis.SetAsync<string>(RedisKeyList.DeviceTokenById(device.Id), token);
                        device.GraphQlEndpoint = $"https://{device.IpAddress}/rf/graphql";//更新graphql地址
                        using var graphQLClient = new GraphQLHttpClient(device.GraphQlEndpoint, new NewtonsoftJsonSerializer());
                        while (device.IsConnected)
                        {
                            var response = await Send<dynamic>(device.GraphQlEndpoint, token, GraphCommand.GetFindTarget());
                            device.DataReceived?.Invoke(response.ToString());
                            await Task.Delay(1000);
                        }
                    }
                }
                Console.WriteLine("登录失败");
            }
            catch (Exception)
            {
                device.IsConnected = false;
            }
        }
        private async Task<T> Send<T>(string url, string token, string cmd)
        {
            try
            {
                var httpClientHandle = new HttpClientHandler();
                httpClientHandle.ServerCertificateCustomValidationCallback = HttpClientHandler.DangerousAcceptAnyServerCertificateValidator;
                var client = new HttpClient(httpClientHandle);
                var opt = new GraphQLHttpClientOptions() { EndPoint = new Uri(url) };
                var graphQLClient = new GraphQLHttpClient(opt, new NewtonsoftJsonSerializer(), client);
                var request = new GraphQL.GraphQLRequest
                {
                    Query = cmd
                };

                graphQLClient.HttpClient.DefaultRequestHeaders.UserAgent.Add(new ProductInfoHeaderValue("Safari", "537.36"));
                graphQLClient.HttpClient.DefaultRequestHeaders.Add("Authorization", "Bearer " + token);
                graphQLClient.HttpClient.DefaultRequestHeaders.Add("ContentType", "application/json");
                var graphQLResponse = await graphQLClient.SendQueryAsync<T>(request);
                return graphQLResponse.Data;
            }
            catch { }
            return default;
        }
        private async Task HandleMqttDevice(Device device)
        {
            try
            {
                var factory = new MqttFactory();
                var mqttClient = factory.CreateMqttClient();

                var options = new MqttClientOptionsBuilder()
                    .WithTcpServer(device.IpAddress, device.Port)
                    .WithCredentials(device.username, device.password)
                    .WithClientId(Guid.NewGuid().ToString())
                    .Build();

                mqttClient.ConnectedAsync += async e =>
                {
                    Console.WriteLine($"设备 {device.Id} 连接成功");
                    await mqttClient.SubscribeAsync(new MqttTopicFilterBuilder().WithTopic(device.Topic).Build());
                };

                mqttClient.DisconnectedAsync += async e =>
                {
                    Console.WriteLine($"设备 {device.Id} 掉线，尝试重连...");
                    device.IsConnected = false;
                };

                mqttClient.ApplicationMessageReceivedAsync += e =>
                {
                    // 接收到 MQTT 消息后，处理数据
                    var message = Encoding.UTF8.GetString(e.ApplicationMessage.PayloadSegment.Array);
                    device.DataReceived?.Invoke(message);
                    return Task.CompletedTask;
                };

                await mqttClient.ConnectAsync(options);
                if (mqttClient.IsConnected)
                {
                    _mqttClients[device.Id] = mqttClient; // 保存 MQTT 客户端实例
                    device.IsConnected = true;
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine($"设备 {device.Id} 连接失败: {ex.Message}");
                device.IsConnected = false;
            }
        }

        private async Task HandleDeviceConnection(Device device)
        {
            int retryDelay = 1000; // 初始重连间隔（1秒）
            int maxDelay = 30000;  // 最大重连间隔（30秒）
            await _log.AddLog(new AddLog { Message = $"设备 {device.Id} 掉线，重新连接中...", Parameters = "", StackTrace = "", url = "" });
            while (!device.IsConnected)
            {
                try
                {
                    switch (device.Protocol)
                    {
                        case ProtocolType.TCP:
                            await HandleTcpDevice(device);
                            break;
                        case ProtocolType.UDP:
                            await HandleUdpDevice(device);
                            break;
                        case ProtocolType.GraphQL:
                            await HandleGraphQLDevice(device);
                            break;
                        case ProtocolType.MQTT:
                            await HandleMqttDevice(device);
                            break;
                    }

                    if (device.IsConnected)
                    {
                        retryDelay = 1000; // 连接成功后重置重连间隔
                        Console.WriteLine($"设备 {device.Id} 重新连接成功");
                        await _log.AddLog(new AddLog { Message = $"设备 {device.Id} 重新连接成功", Parameters = "", StackTrace = "", url = "" });
                    }
                }
                catch (Exception ex)
                {
                    Console.WriteLine($"设备 {device.Id} 连接失败，{retryDelay}ms 后重试... 错误: {ex.Message}");
                }

                await Task.Delay(retryDelay);
                retryDelay = Math.Min(retryDelay * 2, maxDelay); // 指数退避算法，避免频繁重试
            }
        }
        /// <summary>
        /// 监控设备状态
        /// </summary>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        private async Task MonitorDevices(CancellationToken cancellationToken)
        {
            while (!cancellationToken.IsCancellationRequested)
            {
                foreach (var device in _devices.Values)
                {
                    if (!device.IsConnected)
                    {
                        Console.WriteLine($"设备 {device.Id} 掉线，尝试重新连接...");
                        _ = Task.Run(() => HandleDeviceConnection(device)); // 异步执行设备重连
                    }
                }
                await Task.Delay(10000, cancellationToken); // 每 10 秒检查一次设备状态
            }
        }
        /// <summary>
        /// 测试设备连接
        /// </summary>
        /// <param name="deviceId"></param>
        /// <returns></returns>
        public async Task<bool> TestConnection(long deviceId)
        {
            if (_devices.TryGetValue(deviceId, out var device))
            {
                try
                {
                    switch (device.Protocol)
                    {
                        case ProtocolType.TCP:
                            using (TcpClient client = new TcpClient())
                            {
                                await client.ConnectAsync(device.IpAddress, device.Port);
                                return true;
                            }
                        case ProtocolType.UDP:
                            using (var udpClient = new UdpClient())
                            {
                                await udpClient.SendAsync(new byte[] { 0 }, 1, device.IpAddress, device.Port);
                                return true;
                            }
                        case ProtocolType.GraphQL:
                            using (var graphQLClient = new GraphQLHttpClient(device.GraphQlEndpoint, new NewtonsoftJsonSerializer()))
                            {
                                var request = new GraphQL.GraphQLRequest { Query = "{ deviceStatus { id status } }" };
                                var response = await graphQLClient.SendQueryAsync<dynamic>(request);
                                return response.Data != null;
                            }
                        case ProtocolType.MQTT:
                            var factory = new MqttFactory();
                            var mqttClient = factory.CreateMqttClient();
                            var options = new MqttClientOptionsBuilder()
                                .WithTcpServer(device.BrokerAddress)
                                .WithClientId(Guid.NewGuid().ToString())
                                .Build();
                            await mqttClient.ConnectAsync(options);
                            await mqttClient.DisconnectAsync();
                            return true;
                        default:
                            return false;
                    }
                }
                catch (Exception)
                {
                    return false;
                }
            }
            return false;
        }

        public Device GetDevice(long deviceId)
        {
            _devices.TryGetValue(deviceId, out var device);
            return device;
        }
    }
}