FunnyPi-Archive/FunnyCommon/Remoting/Protocol/Command.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using FunnyCommon.Shared;

namespace FunnyCommon.Remoting.Protocol
{
    public class Command
    {
        public CommandType Type { get; set; }
        public byte Value { get; set; }

        public override string ToString()
        {
            return $"{Type} {Value}";
        }

        public byte[] ToBytes()
        {
            var buf = new byte[2];
            buf[0] = (byte)Type;
            buf[1] = Value;

            return buf;
        }

        private static readonly HashSet<byte> CommandTypeValues =
            new HashSet<byte>(Enum.GetValues(typeof(CommandType)).Cast<byte>());

        public static Command ReadFromStream(Stream stream)
        {
            using (var br = new BinaryReader(stream, Encoding.UTF8, true))
            {
                var read = br.ReadByte();
                if (!CommandTypeValues.Contains(read)) throw new InvalidDataException(nameof(CommandType) + $"<{read}>");
                var type = (CommandType)read;

                var obj = new Command
                {
                    Type = type,
                    Value = br.ReadByte(),
                };

                return obj;
            }
        }

        public Response Execute(IPiGpoutManager manager)
        {
            string mesg = null;

            switch (Type)
            {
                case CommandType.AllocateGpio:
                    switch (manager.Allocate(Value))
                    {
                        case true:
                            mesg = $"Rob pin_{Value}";
                            break;

                        case false:
                            mesg = $"Norm Allocated pin_{Value}";
                            break;

                        case null:
                            mesg = $"Already Allocated pin_{Value}";
                            break;

                        default:
                            throw new ArgumentOutOfRangeException(nameof(Nullable<bool>));
                    }

                    break;

                case CommandType.FreeGpio:
                    manager.Free(Value);
                    mesg = $"Norm Free gpio{Value}";
                    break;

                case CommandType.SetHeight:
                    manager.WritePin(Value, true);
                    mesg = $"Norm SetHeight gpio{Value}";
                    break;

                case CommandType.SetLow:
                    manager.WritePin(Value, false);
                    mesg = $"Norm SetLow gpio{Value}";
                    break;

                case CommandType.Sleep:
                    Thread.Sleep(Value);
                    mesg = $"Norm Sleeped {Value}ms";
                    break;

                default:
                    throw new ArgumentOutOfRangeException(nameof(Type));
            }

            return new Response { Success = true, Message = mesg };
        }
    }
}