using MQTTnet;
using MQTTnet.Client;
using MQTTnet.Client.Options;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using HBLConsole.GVL;
using HBLConsole.Service;

namespace HBLConsole.Communication
{
    public class MqttHelper
    {

        private volatile static MqttHelper _Instance;
        public static MqttHelper GetInstance => _Instance ?? (_Instance = new MqttHelper());
        private MqttHelper() { }

        private IMqttClient client;
        IMqttClientOptions options;

        /// <summary>
        /// MQTT 接收消息
        /// </summary>
        public Action<MqttApplicationMessageReceivedEventArgs> MqttReceive { get; set; }

        /// <summary>
        /// MQTT 连接成功
        /// </summary>
        public Action ConnectOk { get; set; }

        /// <summary>
        /// 重连成功
        /// </summary>
        public Action Reconnection { get; set; }

        Action UseDisconnectedAction;


        public async void MqttInitAsync(string UserName, string pass, string IP, int port, string clientID)
        {
            options = new MqttClientOptionsBuilder().WithTcpServer(IP, port).WithClientId(clientID).WithCredentials(UserName, pass).Build();
            client = new MqttFactory().CreateMqttClient();
            client.UseDisconnectedHandler(c =>
            {
                if (UseDisconnectedAction == null)
                {
                    Reconnect();
                    UseDisconnectedAction();
                }

            }).UseApplicationMessageReceivedHandler(c =>
            {
                MqttReceive(c);
            }).UseConnectedHandler((e) =>
            {
                MessageLog.GetInstance.Show($"连接成功");
            });

            try
            {
                await client.ConnectAsync(options);
            }
            catch (Exception ex)
            {
                MessageLog.GetInstance.ShowEx(ex.Message);
                MessageLog.GetInstance.Show("mqtt连接失败！重连执行中");
            }

            if (client.IsConnected)
            {
                MessageLog.GetInstance.Show("MQTT连接成功！");
                if (ConnectOk != null) ConnectOk();
            }

        }

        private void Reconnect()
        {
            UseDisconnectedAction = new Action(() =>
            {
                Thread.Sleep(2000);
                while (!InternetInfo.NetworkConnectState)
                {
                    Thread.Sleep(2000);
                }
                MessageLog.GetInstance.Show($"断开连接");
                bool ErrorFlag = false;
                while (!client.IsConnected)
                {
                    try
                    {
                        MessageLog.GetInstance.Show($"重连中");
                        client.ConnectAsync(options).Wait();
                    }
                    catch (Exception ex)
                    {
                        if (!ErrorFlag)
                        {
                            MessageLog.GetInstance.ShowEx(ex.ToString());
                            ErrorFlag = true;
                        }
                    }
                    Thread.Sleep(3000);
                }

                if (client.IsConnected)
                {
                    MessageLog.GetInstance.Show("MQTT重连成功！");
                    if (Reconnection != null) Reconnection();
                }
                UseDisconnectedAction = null;
            });
        }

        /// <summary>
        /// Mqtt 订阅
        /// </summary>
        /// <param name="topic">需要订阅的主题</param>
        public async void MqttSubscriptionAsync(string topic)
        {
            if (client != null)
            {
                if (client.IsConnected)
                {
                    try
                    {
                        var result = await client.SubscribeAsync(new MqttTopicFilterBuilder().WithTopic(topic).WithExactlyOnceQoS().Build());
                    }
                    catch { }
                }
            }
        }

        /// <summary>
        /// Mqtt 订阅
        /// </summary>
        /// <param name="topic">需要订阅的主题</param>
        public async void MqttSubscriptionAsync(string[] topic)
        {
            if (client != null)
            {
                if (client.IsConnected)
                {
                    try
                    {
                        foreach (var item in topic)
                        {
                            var result = await client.SubscribeAsync(new MqttTopicFilterBuilder().WithTopic(item).WithExactlyOnceQoS().Build());
                        }

                    }
                    catch { }
                }
            }
        }

        /// <summary>
        /// Mqtt 发布
        /// </summary>
        /// <param name="topic">需要发布的主题</param>
        /// <param name="content">需要发布的内容</param>
        public async void MqttPublishAsync(string topic, string content)
        {
            if (client != null)
            {
                if (client.IsConnected)
                {

                    var msg = new MqttApplicationMessageBuilder().WithTopic(topic).WithPayload(content).WithExactlyOnceQoS().Build();
                    try
                    {
                        var result = await client.PublishAsync(msg);
                    }
                    catch { }
                }
            }
        }




    }
}