using DefaultEdit.Enums;
using System;
using System.Collections.Generic;
using System.IO.Ports;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using TouchSocket.Core;
using TouchSocket.SerialPorts;
using TouchSocket.Sockets;

namespace DefaultEdit.Communication
{
    public class SerialCommunication : IDisposable
    {

        /// <summary>
        /// 串口名称
        /// </summary>
        public string PortName { get; private set; }

        /// <summary>
        /// 波特率
        /// </summary>
        public int BaudRate { get; private set; }

        /// <summary>
        /// 奇偶校验位
        /// </summary>
        public Parity Parity { get; private set; }

        /// <summary>
        /// 停止位
        /// </summary>
        public StopBits StopBits { get; private set; }

        /// <summary>
        /// 数据位
        /// </summary>
        public int DataBits { get; private set; }

        public Encoding Encoding { get; set; } = Encoding.ASCII;

        /// <summary>
        /// 当前连接状态
        /// </summary>
        public bool IsConnected
        {
            get
            {
                if ( client != null )
                {
                    return client.Online;
                }
                else
                {
                    return false;
                }
            }
        }

        private SerialPortClient client;
        private IWaitingClient<ISerialPortClient, IReceiverResult> WaitClient;

        /// <summary>
        /// 接收到的数据
        /// </summary>
        public string Data { get; private set; }

        /// <summary>
        /// 连接状态变化事件
        /// </summary>
        public event Action<SerialCommunication, bool> ConnectionChanged;

        /// <summary>
        /// 数据接收事件
        /// </summary>
        public event Action<SerialCommunication, string> DataReceived;

        /// <summary>
        /// 发送数据事件
        /// </summary>
        public event Action<SerialCommunication, string> SendData;


        public Terminator terminator;

        public SerialCommunication(Terminator terminator, string portName, int baudRate = 9600, Parity parity = Parity.None, StopBits stopBits = StopBits.One, int dataBits = 8)
        {
            PortName = portName;
            BaudRate = baudRate;
            Parity = parity;
            StopBits = stopBits;
            DataBits = dataBits;
            client = new SerialPortClient();
            client.Connecting = (client, e) => { return EasyTask.CompletedTask; };//即将连接到端口
            client.Connected = (client, e) =>
            {
                ConnectionChanged?.Invoke(this, IsConnected);
                return EasyTask.CompletedTask;
            };//成功连接到端口
            client.Closing = (client, e) => { return EasyTask.CompletedTask; };//即将从端口断开连接。此处仅主动断开才有效。
            client.Closed = (client, e) =>
            {
                ConnectionChanged?.Invoke(this, IsConnected);
                return EasyTask.CompletedTask;
            };//从端口断开连接，当连接不成功时不会触发。

            client.Received = async (c, e) =>
            {

                Data = e.ByteBlock.Span.ToString(Encoding); //接收到数据
                DataReceived?.Invoke(this, Data);
            };
            TouchSocketConfig touchSocket = new TouchSocketConfig();
            touchSocket.SetSerialPortOption(new SerialPortOption()
            {
                BaudRate = BaudRate,//波特率
                DataBits = DataBits,//数据位
                Parity = Parity,//校验位
                PortName = PortName,//COM
                StopBits = StopBits//停止位

            });
            if ( terminator == Terminator.None )
            {
                touchSocket.SetSerialDataHandlingAdapter(() => new PeriodPackageAdapter() { CacheTimeout = TimeSpan.FromSeconds(0.8) });
            }

            if ( terminator == Terminator.CRLF )
            {
                touchSocket.SetSerialDataHandlingAdapter(() => new TerminatorPackageAdapter("\r\n"));
            }

            client.Setup(touchSocket);
        }

        /// <summary>
        /// 异步连接到串口扫描枪
        /// </summary>
        /// <returns></returns>
        public async Task<bool> ConnectAsync()
        {
            if ( ( await client.TryConnectAsync() ).IsSuccess )
            {
                ConnectionChanged?.Invoke(this, IsConnected);
                //调用CreateWaitingClient获取到IWaitingClient的对象。
                WaitClient = client.CreateWaitingClient(new WaitingOptions()
                {
                    FilterFunc = response => //设置用于筛选的fun委托，当返回为true时，才会响应返回
                    {
                        return true;
                    }
                });
                return true;
            }
            return false;
        }

        /// <summary>
        /// 连接到串口扫描枪
        /// </summary>
        /// <returns></returns>
        public bool Connect()
        {
            if ( client.TryConnect().IsSuccess )//尝试连接到端口
            {
                //调用CreateWaitingClient获取到IWaitingClient的对象。
                WaitClient = client.CreateWaitingClient(new WaitingOptions()
                {
                    FilterFunc = response => //设置用于筛选的fun委托，当返回为true时，才会响应返回
                    {
                        return true;
                    }
                });
                return true;
            }
            return false;
        }

        /// <summary>
        /// 断开连接到串口扫描枪
        /// </summary>
        public void Disconnect()
        {
            if ( IsConnected )
            {
                client.Close();
                ConnectionChanged?.Invoke(this, IsConnected);
            }
        }

        /// <summary>
        /// 发送数据到串口扫描枪,并等待返回数据。
        /// </summary>
        /// <param name="msg"></param>
        /// <param name="millisecondsTimeout"></param>
        /// <returns></returns>
        public string SendThenReturn(string msg, int millisecondsTimeout = 5000)
        {
            //然后使用SendThenReturn。
            SendData?.Invoke(this, msg);
            byte[] returnData = WaitClient.SendThenReturn(Encoding.GetBytes(msg), millisecondsTimeout);
            DataReceived?.Invoke(this, Encoding.GetString(returnData));
            return Encoding.GetString(returnData);
        }

        /// <summary>
        /// 异步发送数据到串口扫描枪,并等待返回数据。
        /// </summary>
        /// <param name="msg"></param>
        /// <param name="millisecondsTimeout"></param>
        /// <returns></returns>
        public async Task<string> SendThenReturnAsync(string msg, int millisecondsTimeout = 5000)
        {
            SendData?.Invoke(this, msg);
            byte[] returnData = await WaitClient.SendThenReturnAsync(Encoding.GetBytes(msg), millisecondsTimeout);
            DataReceived?.Invoke(this, Encoding.GetString(returnData));
            return Encoding.GetString(returnData);
        }

        /// <summary>
        /// 发送数据到串口扫描枪
        /// </summary>
        /// <param name="msg"></param>
        public void Send(string msg)
        {
            if ( IsConnected )
            {
                SendData?.Invoke(this, msg);
                client.Send(Encoding.GetBytes(msg)); //发送数据到串口扫描枪
            }
        }

        public void Dispose()
        {
            if ( WaitClient != null )
            {
                WaitClient = null;
            }
            if ( client != null )
            {
                client.Dispose();
                client = null;
            }
        }
    }
}