using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Timers;
using System.Configuration;
using uPLibrary.Networking.M2Mqtt;
using uPLibrary.Networking.M2Mqtt.Messages;

namespace MQTTClientTest
{
    class M2MqttClient
    {
        private MqttClient _client = null;
        private Timer _timer = new Timer();
        private byte[] _buffer = null;

        string serverIP = ConfigurationManager.AppSettings["MQTTServer.Addr"];
        string serverPort = ConfigurationManager.AppSettings["MQTTServer.Port"];
        string serverClientId = ConfigurationManager.AppSettings["MQTTServer.ClientId"];
        string serverUserId = ConfigurationManager.AppSettings["MQTTServer.UserId"];
        string serverPasswd = ConfigurationManager.AppSettings["MQTTServer.Passwd"];
        string serverTopic = ConfigurationManager.AppSettings["MQTTServer.Topic"];

        public void start()
        {
            read_payload();

            _client = new MqttClient(serverIP, Convert.ToInt32(serverPort), false, null, null, MqttSslProtocols.None);
            string clientId = serverClientId; // Guid.NewGuid().ToString();

            int loop = 3;
            while (loop-- > 0)
            {
                try
                {
                    // 建立连接
                    byte con_ret = _client.Connect(clientId, serverUserId, serverPasswd);                    
                    if (con_ret == 0)
                    {
                        System.Console.WriteLine("Connect to MQTTSever ok!");

                        // 订阅
                        ushort sub_ret = _client.Subscribe(new string[] { serverTopic }, new byte[] { MqttMsgBase.QOS_LEVEL_AT_LEAST_ONCE });
                        break;
                    }
                }
                catch (Exception e)
                {
                    System.Console.WriteLine(e.Message);
                }
            }

            if (loop <= 0)
                return;

            // 回调
            _client.ConnectionClosed += client_ConnectionClosed;
            _client.MqttMsgSubscribed += client_MsgSubscribed;
            _client.MqttMsgPublishReceived += client_MsgPublishReceived;

            // 启动定时器
            _timer.Interval = 2 * 1000;
            _timer.Elapsed += new ElapsedEventHandler(timer_elapsed);
            _timer.Enabled = true;
        }

        public void stop()
        {
            if (_client != null)
            {
                _timer.Enabled = false;
                _client.Disconnect();
            }
        }

        private void read_payload()
        {
            string src = "d:\\1.txt";
            FileStream fs = new FileStream(src, FileMode.Open);

            //获取文件大小
            long size = fs.Length;

            _buffer = new byte[size];

            //将文件读到byte数组中
            fs.Read(_buffer, 0, _buffer.Length);

            fs.Close();        
        }

        private void client_MsgSubscribed(object sender, MqttMsgSubscribedEventArgs e)
        {
            System.Console.WriteLine("Subscribed " + e.MessageId);
        }

        private void client_ConnectionClosed(object sender, EventArgs e)
        {
            System.Console.WriteLine("Connection lost");
        }

        // 处理接收到的消息
        private void client_MsgPublishReceived(object sender, MqttMsgPublishEventArgs e)
        {
            string msg = System.Text.Encoding.Default.GetString(e.Message);
            System.Console.WriteLine("Message received, " + msg);
        }

        private void timer_elapsed(object sender, ElapsedEventArgs e)
        {
            string strPayload = DateTime.Now.ToString();
            //byte[] buffer = System.Text.Encoding.Default.GetBytes(strPayload);

            if (_buffer != null)
            {
                _client.Publish(serverTopic, _buffer, MqttMsgBase.QOS_LEVEL_AT_LEAST_ONCE, false);
            }
        }
    }
}