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

namespace FR_Pump_HaoSheng
{
    public class MessageCutter : IMessageCutter<byte[]>
    {
        private readonly List<byte> buffer = new List<byte>();
        public byte[] Message { get; private set; }

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

        /// <summary>
        /// 富仁豪升通讯协议补充
        /// 同步头 FA + 00 + 00 + 00 + 有效数据长度(2Bytes) + 有效数据 + CRC16(2Bytes)
        /// </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[0] != 0xFA)
                {
                    this.OnInvalidMessageRead?.Invoke(this,
                        new MessageCutterInvalidMessageReadEventArg()
                        {
                            Message =
                                "invalid byte[0]: 0x"
                                    + this.buffer[0].ToString("x2")
                                    + " clear buf and continue reading..."
                        });
                    this.buffer.Clear();
                    continue;
                }

                if (this.buffer.Count >= 2
                    && this.buffer[1] != 0x00)
                {
                    this.OnInvalidMessageRead?.Invoke(this,
                        new MessageCutterInvalidMessageReadEventArg()
                        {
                            Message =
                                "invalid byte[1]: 0x"
                                    + this.buffer[1].ToString("x2")
                                    + " clear buf and continue reading..."
                        });
                    this.buffer.Clear();
                    continue;
                }

                if (this.buffer.Count >= 3
                    //第三个字节为油枪状态，0 – 挂枪， 1 – 抬枪
                    && this.buffer[2] > 1)
                {
                    this.OnInvalidMessageRead?.Invoke(this,
                        new MessageCutterInvalidMessageReadEventArg()
                        {
                            Message =
                                "invalid byte[2]: 0x"
                                    + this.buffer[2].ToString("x2")
                                    + ", 第三个字节为油枪状态，0 – 挂枪， 1 – 抬枪, clear buf and continue reading..."
                        });
                    this.buffer.Clear();
                    continue;
                }

                if (this.buffer.Count >= 4
                    //00 为 1 号枪，01 为 2 号枪
                    && this.buffer[3] > 1)
                {
                    this.OnInvalidMessageRead?.Invoke(this,
                        new MessageCutterInvalidMessageReadEventArg()
                        {
                            Message =
                                "invalid byte[3]: 0x"
                                    + this.buffer[2].ToString("x2")
                                    + ", 00 为 1 号枪，01 为 2 号枪, clear buf and continue reading..."
                        });
                    this.buffer.Clear();
                    continue;
                }

                if (this.buffer.Count >= 8 &&
                   this.buffer.Count == (this.buffer.Skip(4).Take(2).GetBCD() + 8))
                {
                    this.Message = this.buffer.ToArray();
                    var safe = this.OnMessageCut;
                    safe?.Invoke(this, null);
                    this.buffer.Clear();
                }

                if (this.buffer.Count >= 500)
                {
                    this.OnInvalidMessageRead?.Invoke(this,
                        new MessageCutterInvalidMessageReadEventArg()
                        {
                            Message = "Long length(len: " + this.buffer.Count + ") message is still constructing in MsgCutter: 0x" + this.buffer.ToHexLogString()
                        });
                    this.buffer.Clear();
                    continue;
                }
            }
        }
    }
}