using System;
using System.Net;
using System.Runtime.InteropServices;


namespace UniJSON
{
    public static class ByteUnion
    {
        [StructLayout(LayoutKind.Explicit)]
        public struct WordValue
        {
            [FieldOffset(0)]
            public Int16 Signed;
            [FieldOffset(0)]
            public UInt16 Unsigned;

            [FieldOffset(0)]
            public byte Byte0;
            [FieldOffset(1)]
            public byte Byte1;

            public WordValue HostToNetworkOrder() { return new WordValue { Signed = IPAddress.HostToNetworkOrder(Signed) }; }

            public static WordValue Create(Int16 value) { return new WordValue { Signed = value }; }
            public static WordValue Create(UInt16 value) { return new WordValue { Unsigned = value }; }
        }

        [StructLayout(LayoutKind.Explicit)]
        public struct DWordValue
        {
            [FieldOffset(0)]
            public Int32 Signed;
            [FieldOffset(0)]
            public UInt32 Unsigned;
            [FieldOffset(0)]
            public Single Float;

            [FieldOffset(0)]
            public byte Byte0;
            [FieldOffset(1)]
            public byte Byte1;
            [FieldOffset(2)]
            public byte Byte2;
            [FieldOffset(3)]
            public byte Byte3;

            public DWordValue HostToNetworkOrder() { return new DWordValue { Signed = IPAddress.HostToNetworkOrder(Signed) }; }

            public static DWordValue Create(Int32 value) { return new DWordValue { Signed = value }; }
            public static DWordValue Create(UInt32 value) { return new DWordValue { Unsigned = value }; }
            public static DWordValue Create(Single value) { return new DWordValue { Float = value }; }
        }

        [StructLayout(LayoutKind.Explicit)]
        public struct QWordValue
        {
            [FieldOffset(0)]
            public Int64 Signed;
            [FieldOffset(0)]
            public UInt64 Unsigned;
            [FieldOffset(0)]
            public Double Float;

            [FieldOffset(0)]
            public byte Byte0;
            [FieldOffset(1)]
            public byte Byte1;
            [FieldOffset(2)]
            public byte Byte2;
            [FieldOffset(3)]
            public byte Byte3;
            [FieldOffset(4)]
            public byte Byte4;
            [FieldOffset(5)]
            public byte Byte5;
            [FieldOffset(6)]
            public byte Byte6;
            [FieldOffset(7)]
            public byte Byte7;

            public QWordValue HostToNetworkOrder()
            {
                if (BitConverter.IsLittleEndian)
                {
                    return new QWordValue
                    {
                        Byte0 = Byte7,
                        Byte1 = Byte6,
                        Byte2 = Byte5,
                        Byte3 = Byte4,
                        Byte4 = Byte3,
                        Byte5 = Byte2,
                        Byte6 = Byte1,
                        Byte7 = Byte0,
                    };
                }
                else
                {
                    return this;
                }
            }

            public static QWordValue Create(Int64 value) { return new QWordValue { Signed = value }; }
            public static QWordValue Create(UInt64 value) { return new QWordValue { Unsigned = value }; }
            public static QWordValue Create(Double value) { return new QWordValue { Float = value }; }
        }
    }
}