using System;
using System.IO;

namespace GostCryptography.Asn1.Ber
{
    public abstract class Asn1EncodeBuffer : Asn1MessageBuffer
    {
        public const int DefaultSizeIncrement = 0x400;

        protected byte[] Data;
        protected int ByteIndex;
        protected int SizeIncrement;

        protected Asn1EncodeBuffer()
        {
            InitBuffer(DefaultSizeIncrement);
        }

        protected Asn1EncodeBuffer(int sizeIncrement)
        {
            if (sizeIncrement == 0)
            {
                sizeIncrement = DefaultSizeIncrement;
            }

            InitBuffer(sizeIncrement);
        }

        public abstract byte[] MsgCopy { get; }

        public abstract int MsgLength { get; }

        public virtual void BinDump(string varName)
        {
            var outs = new StreamWriter(Console.OpenStandardOutput(), Console.Out.Encoding)
            {
                AutoFlush = true
            };

            BinDump(outs, varName);
        }

        public abstract void BinDump(StreamWriter outs, string varName);

        protected internal virtual void CheckSize(int bytesRequired)
        {
            if ((ByteIndex + bytesRequired) > Data.Length)
            {
                var num = ((bytesRequired - 1) / SizeIncrement) + 1;
                var num2 = num * SizeIncrement;
                var destinationArray = new byte[Data.Length + num2];

                Array.Copy(Data, 0, destinationArray, 0, ByteIndex + 1);

                Data = destinationArray;
            }
        }

        public abstract void Copy(byte value);

        public abstract void Copy(byte[] value);

        public virtual void HexDump()
        {
            HexDump(GetInputStream());
        }

        public virtual void HexDump(StreamWriter outs)
        {
            HexDump(GetInputStream(), outs);
        }

        protected virtual void InitBuffer(int sizeIncrement)
        {
            SizeIncrement = sizeIncrement;
            Data = new byte[SizeIncrement];
            ByteIndex = 0;
        }

        public abstract void Reset();

        public abstract void Write(Stream outs);
    }
}