using System;   
using System.IO;
using System.Text;
using System.Collections.Generic;
using System.Linq;
using System.Collections;
using System.Xml.Schema;
namespace ln.type
{
    public static class Extensions
    {
        public static T[] Concat<T>(this T[] me, T[] other)
        {
            T[] combined = new T[me.Length + other.Length];
            Array.Copy(me, 0, combined, 0, me.Length);
            Array.Copy(other, 0, combined, me.Length, combined.Length);
            return combined;
        }


        public static T[] Combine<T>(this T[] me, IEnumerable<T> other)
        {
            HashSet<T> elements = new HashSet<T>(me);
            foreach (T e in other)
                elements.Add(e);
            return elements.ToArray();
        }
        public static T[] Remove<T>(this T[] me, IEnumerable<T> remove)
        {
            HashSet<T> elements = new HashSet<T>(me);
            foreach (T e in remove)
                elements.Remove(e);
            return elements.ToArray();
        }


        public static bool AreEqual<T>(this T[] me, T[] you)
        {
            if (me.Length != you.Length)
                return false;

            for (int n = 0; n < me.Length; n++)
                if (!me[n].Equals(you[n]))
                    return false;

            return true;
        }

        public static byte[] BigEndian(this byte[] bytes)
        {
            if (BitConverter.IsLittleEndian)
                Array.Reverse(bytes);
            return bytes;
        }

        public static int ReadInteger(this Stream stream)
        {
            byte[] b = new byte[4];
            stream.Read(b, 0, 4);
            return BitConverter.ToInt32(b, 0);
        }
        public static void WriteInteger(this Stream stream, int i)
        {
            stream.Write(BitConverter.GetBytes(i), 0, 4);
        }
        public static uint ReadUInteger(this Stream stream)
        {
            byte[] b = new byte[4];
            stream.Read(b, 0, 4);
            return BitConverter.ToUInt32(b.BigEndian(), 0);
        }
        public static void WriteUInteger(this Stream stream, uint i)
        {
            stream.Write(BitConverter.GetBytes(i).BigEndian(), 0, 4);
        }

        public static long ReadLong(this Stream stream)
        {
            byte[] b = new byte[8];
            stream.Read(b, 0, 8);
            return BitConverter.ToInt64(b, 0);
        }
        public static void WriteLong(this Stream stream, long i)
        {
            stream.Write(BitConverter.GetBytes(i), 0, 8);
        }
        public static ulong ReadULong(this Stream stream)
        {
            byte[] b = new byte[8];
            stream.Read(b, 0, 8);
            return BitConverter.ToUInt64(b.BigEndian(), 0);
        }
        public static void WriteULong(this Stream stream, ulong i)
        {
            stream.Write(BitConverter.GetBytes(i).BigEndian(), 0, 8);
        }


        public static byte[] ReadToEnd(this Stream stream)
        {
            MemoryStream memoryStream = new MemoryStream();
            stream.CopyTo(memoryStream);
            return memoryStream.ToArray();
        }

        public static void WriteByte(this Stream stream, char ch)
        {
            if (ch > 255)
                throw new ArgumentOutOfRangeException(nameof(ch));
            stream.WriteByte((byte)ch);
        }
        public static void WriteBytes(this Stream stream, byte[] bytes)
        {
            stream.Write(bytes, 0, bytes.Length);
        }
        public static byte[] ReadBytes(this Stream stream, int length)
        {
            byte[] bytes = new byte[length];
            stream.Read(bytes, 0, length);
            return bytes;
        }

        public static void WriteShort(this Stream stream, short value, bool bigEndian = false)
        {
            byte[] bytes = BitConverter.GetBytes(value);
            if (BitConverter.IsLittleEndian == bigEndian)
                Array.Reverse(bytes);
            stream.Write(bytes, 0, bytes.Length);
        }
        public static short ReadShort(this Stream stream, bool bigEndian = false)
        {
            byte[] bytes = stream.ReadBytes(2);
            if (BitConverter.IsLittleEndian == bigEndian)
                Array.Reverse(bytes);
            return BitConverter.ToInt16(bytes, 0);
        }
        public static void WriteUShort(this Stream stream, ushort value, bool bigEndian = false)
        {
            byte[] bytes = BitConverter.GetBytes(value);
            if (BitConverter.IsLittleEndian == bigEndian)
                Array.Reverse(bytes);
            stream.Write(bytes, 0, bytes.Length);
        }
        public static ushort ReadUShort(this Stream stream, bool bigEndian = false)
        {
            byte[] bytes = stream.ReadBytes(2);
            if (BitConverter.IsLittleEndian == bigEndian)
                Array.Reverse(bytes);
            return BitConverter.ToUInt16(bytes, 0);
        }

        public static void WriteLong(this Stream stream, long value, bool bigEndian = false)
        {
            byte[] bytes = BitConverter.GetBytes(value);
            if (BitConverter.IsLittleEndian == bigEndian)
                Array.Reverse(bytes);
            stream.Write(bytes, 0, bytes.Length);
        }
        public static long ReadLong(this Stream stream, bool bigEndian = false)
        {
            byte[] bytes = stream.ReadBytes(8);
            if (BitConverter.IsLittleEndian == bigEndian)
                Array.Reverse(bytes);
            return BitConverter.ToInt64(bytes, 0);
        }

        public static void WriteULong(this Stream stream, ulong value, bool bigEndian = false)
        {
            byte[] bytes = BitConverter.GetBytes(value);
            if (BitConverter.IsLittleEndian == bigEndian)
                Array.Reverse(bytes);
            stream.Write(bytes, 0, bytes.Length);
        }
        public static ulong ReadULong(this Stream stream, bool bigEndian = false)
        {
            byte[] bytes = stream.ReadBytes(8);
            if (BitConverter.IsLittleEndian == bigEndian)
                Array.Reverse(bytes);
            return BitConverter.ToUInt64(bytes, 0);
        }

        public static void WriteFloat(this Stream stream, float value, bool bigEndian = false)
        {
            byte[] bytes = BitConverter.GetBytes(value);
            if (BitConverter.IsLittleEndian == bigEndian)
                Array.Reverse(bytes);
            stream.Write(bytes, 0, bytes.Length);
        }
        public static float ReadFloat(this Stream stream, bool bigEndian = false)
        {
            byte[] bytes = stream.ReadBytes(4);
            if (BitConverter.IsLittleEndian == bigEndian)
                Array.Reverse(bytes);
            return BitConverter.ToSingle(bytes, 0);
        }

        public static void WriteDouble(this Stream stream, double value, bool bigEndian = false)
        {
            byte[] bytes = BitConverter.GetBytes(value);
            if (BitConverter.IsLittleEndian == bigEndian)
                Array.Reverse(bytes);
            stream.Write(bytes, 0, bytes.Length);
        }
        public static double ReadDouble(this Stream stream, bool bigEndian = false)
        {
            byte[] bytes = stream.ReadBytes(8);
            if (BitConverter.IsLittleEndian == bigEndian)
                Array.Reverse(bytes);
            return BitConverter.ToDouble(bytes, 0);
        }




        public static byte[] GetBytes(this int v, bool bigEndian = false)
        {
            byte[] bytes = BitConverter.GetBytes(v);
            if (BitConverter.IsLittleEndian == bigEndian)
                Array.Reverse(bytes);
            return bytes;
        }
        public static byte[] GetBytes(this uint v, bool bigEndian = false)
        {
            byte[] bytes = BitConverter.GetBytes(v);
            if (BitConverter.IsLittleEndian == bigEndian)
                Array.Reverse(bytes);
            return bytes;

        }
        public static int GetInt(this byte[] bytes, bool bigEndian = false) => GetInt(bytes, 0, bigEndian);
        public static int GetInt(this byte[] bytes, int offset, bool bigEndian = false)
        {
            byte[] ib = bytes.Slice(offset, 4).BigEndian();
            return BitConverter.ToInt32(ib, 0);
        }
        public static uint GetUInt(this byte[] bytes, bool bigEndian = false) => GetUInt(bytes, 0, bigEndian);
        public static uint GetUInt(this byte[] bytes, int offset, bool bigEndian = false)
        {
            byte[] ib = bytes.Slice(offset, 4).BigEndian();
            return BitConverter.ToUInt32(ib, 0);
        }

        public static byte[] GetBytes(this short v, bool bigEndian = false)
        {
            byte[] bytes = BitConverter.GetBytes(v);
            if (BitConverter.IsLittleEndian == bigEndian)
                Array.Reverse(bytes);
            return bytes;
        }
        public static byte[] GetBytes(this ushort v, bool bigEndian = false)
        {
            byte[] bytes = BitConverter.GetBytes(v);
            if (BitConverter.IsLittleEndian == bigEndian)
                Array.Reverse(bytes);
            return bytes;
        }

        public static short GetShort(this byte[] bytes, bool bigEndian = false) => GetShort(bytes, 0, bigEndian);
        public static short GetShort(this byte[] bytes, int offset, bool bigEndian = false)
        {
            byte[] ib = bytes.Slice(offset, 2).BigEndian();
            return BitConverter.ToInt16(ib, 0);
        }
        public static ushort GetUShort(this byte[] bytes, bool bigEndian = false) => GetUShort(bytes, 0, bigEndian);
        public static ushort GetUShort(this byte[] bytes, int offset, bool bigEndian = false)
        {
            byte[] ib = bytes.Slice(offset, 2).BigEndian();
            return BitConverter.ToUInt16(ib, 0);
        }

        public static byte[] GetBytes(this long v, bool bigEndian = false)
        {
            byte[] bytes = BitConverter.GetBytes(v);
            if (BitConverter.IsLittleEndian == bigEndian)
                Array.Reverse(bytes);
            return bytes;
        }
        public static byte[] GetBytes(this ulong v, bool bigEndian = false)
        {
            byte[] bytes = BitConverter.GetBytes(v);
            if (BitConverter.IsLittleEndian == bigEndian)
                Array.Reverse(bytes);
            return bytes;
        }


        public static T[] Slice<T>(this T[] me, int offset) => Slice(me, offset, me.Length - offset);
        public static T[] Slice<T>(this T[] me, ref int offset) => Slice(me, ref offset, me.Length - offset);
        public static T[] Slice<T>(this T[] me, int offset, int length) => Slice(me, ref offset, length);
        public static T[] Slice<T>(this T[] me, ref int offset, int length)
        {
            if (offset < 0)
                offset = me.Length + offset;
            if (length < 0)
                length = me.Length - offset + length;

            T[] slice = new T[length];
            Array.Copy(me, offset, slice, 0, length);
            offset += length;
            return slice;
        }

        public static byte[] BytesFromHexString(string hexString)
		{
			int NumberChars = hexString.Length;
			byte[] bytes = new byte[NumberChars / 2];
			for (int i = 0; i < NumberChars; i += 2)
				bytes[i / 2] = Convert.ToByte(hexString.Substring(i, 2), 16);
			return bytes;
		}

		public static string ToHexString(this byte[] bytes)
        {
            StringBuilder stringBuilder = new StringBuilder();

            for (int n = 0; n < bytes.Length; n ++)
            {
                stringBuilder.AppendFormat("{0:X2}", bytes[n]);
            }

            return stringBuilder.ToString();
        }

        public static string HexDump(this byte[] bytes)
        {
            StringBuilder stringBuilder = new StringBuilder();

            for (int n = 0; n < bytes.Length; n += 16)
            {
                int len = bytes.Length - n;
                if (len > 16)
                    len = 16;

                byte[] section = bytes.Slice(n, len);

                for (int i = 0; i < 16; i++)
                {
                    if (i < section.Length)
                        stringBuilder.AppendFormat("{0:X2} ", section[i]);
                    else
                        stringBuilder.Append("   ");
                }

                stringBuilder.Append("  ");

                foreach (byte b in section)
                {
                    if (b < 32)
                        stringBuilder.Append('.');
                    else
                        stringBuilder.Append((char)b);
                }
                stringBuilder.AppendLine();
            }

            return stringBuilder.ToString();
        }

        public static Decimal ToDecimal(this double v)
        {
            if (v <= (double)Decimal.MinValue)
                return decimal.MinValue;
            if (v >= (double)Decimal.MaxValue)
                return decimal.MaxValue;

            return new Decimal(v);
        }

        public static string GetSimpleQualifiedName(this Type type) => string.Format("{0}, {1}", type.FullName, type.Assembly.GetName().Name);

    }
    public static class DateTimeExtensions
    { 
        public static DateTime EPOCH = new DateTime(1970, 1, 1, 0, 0, 0, 0, System.DateTimeKind.Utc);

        public static DateTime FromUnixTimeSeconds(double seconds)
        {
            return EPOCH.AddSeconds(seconds);
        }
        public static DateTime FromUnixTimeMilliseconds(double milliseconds)
        {
            return EPOCH.AddMilliseconds(milliseconds);
        }

        public static double ToUnixTimeSeconds(this DateTime dateTime)
        {
            return (dateTime - EPOCH).TotalSeconds;
        }
        public static double ToUnixTimeMilliseconds(this DateTime dateTime)
        {
            return (dateTime - EPOCH).TotalMilliseconds;
        }
    }
}