using LibXom.Data;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace LibXom.Streams
{
    public class XomStreamWriter : IDisposable
    {
        private Stream xStream;
        public Stream BaseStream
        {
            get
            {
                return xStream;
            }
        }
        public void WriteByte(byte b)
        {
            xStream.WriteByte(b);
        }
        public int Pos()
        {
            return Convert.ToInt32(xStream.Position);
        }
        public void Rewind(int amt)
        {
            xStream.Seek(-amt, SeekOrigin.Current);
        }
        public void Skip(int amt)
        {
            int cpos = Pos();
            int len = Convert.ToInt32(xStream.Length);
            int remain = len - cpos;

            if (amt > remain)
            {
                xStream.Seek(remain, SeekOrigin.Current);
                amt -= remain;
                WritePadding(0, amt);
            }
            else
            {
                xStream.Seek(amt, SeekOrigin.Current);
            }
        }
        public void WritePadding(byte pad, int len)
        {
            byte[] buf = new byte[len];
            if (pad != 0)
                for (int i = 0; i < len; i++)
                    buf[i] = pad;
            WriteBytes(buf);
        }


        public void WriteInt32Array(int[] uncompressedArr)
        {
            this.WriteCompressedInt(uncompressedArr.Length);
            for (int i = 0; i < uncompressedArr.Length; i++) WriteInt32(uncompressedArr[i]);
        }

        public void WriteCompressedIntArray(int[] uncompressedArr)
        {
            this.WriteCompressedInt(uncompressedArr.Length);
            for (int i = 0; i < uncompressedArr.Length; i++) WriteCompressedInt(uncompressedArr[i]);
        }

        public void WriteCompressedInt(int uncompressedInt)
        {
            XomCompressor.compressIntAndWriteToStream(xStream, uncompressedInt);
        }

        public void WriteByteArray(byte[] data)
        {
            this.WriteCompressedInt(data.Length);
            WriteBytes(data);
        }

        public void WriteBytes(byte[] bytes)
        {
            xStream.Write(bytes, 0, bytes.Length);
        }

        public void WriteBool(bool value)
        {
            if (value) this.WriteByte(0x01);
            else this.WriteByte(0x00);
        }
        public void WriteFloat(float value)
        {
            byte[] buffer = BitConverter.GetBytes(value);
            WriteBytes(buffer);
        }

        public void WriteDateTime(DateTime date)
        {
            WriteByte(Convert.ToByte(date.Second));
            WriteByte(Convert.ToByte(date.Minute));
            WriteByte(Convert.ToByte(date.Hour));
            WriteByte(Convert.ToByte(date.Day));
            WriteByte(Convert.ToByte(date.Month));
            WriteUInt16(Convert.ToUInt16(date.Year));
        }
        public void WriteUInt16(ushort value)
        {
            byte[] buffer = BitConverter.GetBytes((ushort)value);
            WriteBytes(buffer);
        }

        public void WriteInt16(short value)
        {
            byte[] buffer = BitConverter.GetBytes((short)value);
            WriteBytes(buffer);
        }
        public void WriteUInt32(uint value)
        {
            byte[] buffer = BitConverter.GetBytes((uint)value);
            WriteBytes(buffer);
        }

        public void WriteInt32(int value)
        {
            byte[] buffer = BitConverter.GetBytes((int)value);
            WriteBytes(buffer);
        }
        public void WriteInt32BE(int value)
        {
            byte[] buffer = BitConverter.GetBytes(value);
            buffer.Reverse();
            WriteBytes(buffer);
        }

        public void WriteStrLen(string str, int len)
        {
            WriteStr(str);

            int padLen = len - str.Length;
            if (padLen > 0)
                WritePadding(0x00, padLen);
        }

        public void WriteStr(string str)
        {
            byte[] buffer = Encoding.UTF8.GetBytes(str);
            WriteBytes(buffer);
        }

        public void WriteCStr(string str)
        {
            WriteStr(str);
            WriteByte(0);
        }

        public void Dispose()
        {
            this.xStream.Dispose();
        }

        public XomStreamWriter(Stream xStream)
        {
            this.xStream = xStream;
        }
    }
}