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

namespace Censtar_31064V105OrV106_Pump
{
    public class MessageCutterV105 : IMessageCutter<byte[]>
    {
        private readonly SizableWindow<byte> window;
        private State nextState = State.Uninitialized;
        private readonly List<byte> buffer = new List<byte>();
        /// <summary>
        /// cmd:bodyLength
        /// </summary>
        private static Dictionary<byte, byte> CmdCharAndBodyLengthMappers
            = new Dictionary<byte, byte>() {
                {0,0 },
                {2,1 },
                {3,0 },
                {4,0},
                {5,0},
                {6,0 },
                {7,0 },
                {8,12 },
                {9,1 },
                {0x0E,3 },
                {0x10,1 },
                {0x12,0 },
                {0x13,0 },
                {0x14,0 },
                {0x15,3 },
                {0x17,0 },
                {0x31,0 },
                {0x32,0 },
                {0x33,0 },
                {0x34,4 },
                {0x35,4 },
                {0x36,20 },
                {0x38,22 },
            };
        public byte[] Message { get; private set; }

        public event EventHandler OnMessageCut;
        public event EventHandler<MessageCutterInvalidMessageReadEventArg> OnInvalidMessageRead;
        private enum State
        {
            Uninitialized,
            SyncHeader_Cmd_NozzleNumber_Ready,
            BodyAndCrcReady,
        }

        public MessageCutterV105()
        {
            this.window = new SizableWindow<byte>(3);
            this.window.OnWindowFull += (data) =>
            {
                switch (nextState)
                {
                    case State.Uninitialized:
                        if (data[0] == data[1] && data[0] == data[2] && data[0] == 0xFC)
                        {
                            this.window.NewSize = 5;
                            this.nextState = State.SyncHeader_Cmd_NozzleNumber_Ready;
                        }
                        else
                        {
                            this.window.Clear();
                            this.OnInvalidMessageRead?.Invoke(this, new MessageCutterInvalidMessageReadEventArg()
                            {
                                Message = "First 3 bytes: 0x" + this.window.ToHexLogString() + " are not the expecting 0xFC, will clear window and start over"
                            });
                        }
                        break;
                    case State.SyncHeader_Cmd_NozzleNumber_Ready:
                        var cmd = this.window[3];
                        if (!CmdCharAndBodyLengthMappers.TryGetValue(cmd, out byte bodyLength))
                        {
                            this.nextState = State.Uninitialized;
                            this.OnInvalidMessageRead?.Invoke(this, new MessageCutterInvalidMessageReadEventArg()
                            {
                                Message = "Cmd byte: 0x" + cmd.ToString("X2") + " is not defined, will clear window and start over"
                            });
                        }
                        else
                        {
                            this.window.NewSize = 3 + 1 + 1 + bodyLength + 1;
                            this.nextState = State.BodyAndCrcReady;
                        }

                        break;
                    case State.BodyAndCrcReady:
                        //innerLogger.Debug(this.loggerAppendix + " Fire OnMessageConstructed with innerQueue: " + this.buffer.ToHexLogString());
                        this.Message = this.window.ToArray();
                        var safe = this.OnMessageCut;
                        safe?.Invoke(this, null);
                        this.nextState = State.Uninitialized;
                        this.window.Clear();
                        //this.window.NewSize = this.initWindowSize;
                        break;
                    default:
                        throw new ArgumentOutOfRangeException();
                }
            };
        }
        public void Feed(byte[] data)
        {
            for (int i = 0; i < data.Length; i++)
                this.window.Add(data[i]);
        }
    }
}