using Edge.Core.Parser.BinaryParser.Util;
using Edge.Core.Processor.Communicator;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;
using System.Linq;

namespace SuZhouSuAnXin_BatteryEMS
{
    public class MessageCutter : IMessageCutter<byte[]>, IDisposable
    {
        public byte[] Message { get; set; }

        public event EventHandler OnMessageCut;
        public event EventHandler<MessageCutterInvalidMessageReadEventArg> OnInvalidMessageRead;

        private List<byte> buffer = new List<byte>();

        public MessageCutter()
        {
            //this.timer = new System.Timers.Timer();
            //this.timer.Interval = this.timeWindowTimedoutValue;
            //this.timer.Elapsed += (s, a) =>
            //{
            //    this.timer.Stop();
            //    this.Message = buffer.ToArray();
            //    if (this.Message.Length <= 6) OnInvalidMessageRead?.Invoke(this, new MessageCutterInvalidMessageReadEventArg()
            //    {
            //        Message = $"Raw msg: 0x{this.Message.ToHexLogString()} does not meet the min length(valid Len must >6) requirment"
            //    });
            //    this.OnMessageCut?.Invoke(this, new EventArgs());
            //    this.buffer.Clear();
            //};
        }

        /// <summary>
        /// 数据段格式定义如下：
        /// 2 字节 2 字节 2 字节 1 字节 1 字节 1 字节 N 字节
        /// 事务处理标识符（byte0，byte1）—为 0
        /// 协议标识符（byte2，byte3）—为 0
        /// 长度字段（byte4 为高字节，byte5 为低字节）—表示后面字节的总长度（地址+功能码+数据）
        /// 地址（byte6）—表示被寻址的从机地址，本协议中规定从机地址为 20 H
        /// 事务处理标识符 协议标识符 长度字段 地址 功能码 字节数 数据
        /// </summary>
        /// <param name="data"></param>
        public void Feed(byte[] data)
        {
            for (int i = 0; i < data.Length; i++)
            {
                this.buffer.Add(data[i]);
                if (this.buffer.Count >= 1 && this.buffer[0] != 0x00)
                {
                    this.OnInvalidMessageRead?.Invoke(this,
                        new MessageCutterInvalidMessageReadEventArg()
                        {
                            Message = $"invalid byte[0]: 0x{this.buffer[0].ToString("x2") }, " +
                            $"must be 0x00, clear buf and continue reading..."
                        });
                    this.buffer.Clear();
                    continue;
                }

                if (this.buffer.Count >= 4 &&
                    (this.buffer[0] != 0 || this.buffer[1] != 0 || this.buffer[2] != 0 || this.buffer[3] != 0))
                {
                    this.OnInvalidMessageRead?.Invoke(this,
                        new MessageCutterInvalidMessageReadEventArg()
                        {
                            Message = $"invalid value in byte[0] or byte[1] or byte[2] or byte[3], actual are: 0x{this.buffer.Take(4).ToHexLogString() }, " +
                            $"expect all 0x00, clear buf and continue reading..."
                        });
                    this.buffer.Clear();
                    continue;
                }

                if (this.buffer.Count >= 7 && this.buffer[6] != 0x20)
                {
                    this.OnInvalidMessageRead?.Invoke(this,
                        new MessageCutterInvalidMessageReadEventArg()
                        {
                            Message = $"invalid byte[6]: 0x{this.buffer[6].ToString("x2") }, " +
                            $"must be 0x20, clear buf and continue reading..."
                        });
                    this.buffer.Clear();
                    continue;
                }

                if (this.buffer.Count >= 9 && this.buffer.Count == (4 + 2 + this.buffer[4] * 256 + this.buffer[5]))
                {
                    this.Message = this.buffer.ToArray();
                    var safe = this.OnMessageCut;
                    safe?.Invoke(this, null);
                    this.buffer.Clear();
                }

                if (this.buffer.Count >= 200)
                {
                    this.OnInvalidMessageRead?.Invoke(this,
                        new MessageCutterInvalidMessageReadEventArg()
                        {
                            Message = $"Long length(len: {this.buffer.Count } message is still constructing in MsgCutter: 0x{ this.buffer.ToHexLogString()}, clear buf and continue reading..."
                        });
                    this.buffer.Clear();
                    continue;
                }
            }
        }

        public void Dispose()
        {
        }
    }
}