using System;
using System.IO;
using System.Text;

namespace fis.Vid
{
    public class VinnoStreamReader
    {
        private readonly Stream _stream;

        public VinnoStreamReader(Stream stream)
        {
            _stream = stream;
        }

        /// <summary>
        /// Read string from stream.
        /// </summary>
        /// <returns></returns>
        public string ReadString()
        {
            var dataLength = ReadInt();
            var data = new byte[dataLength];
            _stream.Read(data, 0, dataLength);
            return Encoding.Unicode.GetString(data,0,data.Length);
        }

        /// <summary>
        /// Read a int32 value from the stream.
        /// </summary>
        /// <returns></returns>
        public int ReadInt()
        {
            var data = new byte[sizeof(int)];
            _stream.Read(data, 0, sizeof(int));
            return BitConverter.ToInt32(data, 0);
        }

        /// <summary>
        /// Read a short value from the stream.
        /// </summary>
        /// <returns></returns>
        public short ReadShort()
        {
            var data = new byte[sizeof(short)];
            _stream.Read(data, 0, sizeof(short));
            return BitConverter.ToInt16(data, 0);
        }

        /// <summary>
        /// Read a Int64 value from the stream.
        /// </summary>
        /// <returns></returns>
        public long ReadLong()
        {
            var data = new byte[sizeof(long)];
            _stream.Read(data, 0, sizeof(long));
            return BitConverter.ToInt64(data, 0);
        }


        /// <summary>
        /// Read a float value from the stream.
        /// </summary>
        /// <returns></returns>
        public float ReadFloat()
        {
            var data = new byte[sizeof(float)];
            _stream.Read(data, 0, sizeof(float));
            return BitConverter.ToSingle(data, 0);
        }


        /// <summary>
        /// Read a double value from the stream.
        /// </summary>
        /// <returns></returns>
        public double ReadDouble()
        {
            var data = new byte[sizeof(double)];
            _stream.Read(data, 0, sizeof(double));
            return BitConverter.ToDouble(data, 0);
        }


        /// <summary>
        /// Read a bool value from the stream.
        /// </summary>
        /// <returns></returns>
        public bool ReadBool()
        {
            var data = new byte[sizeof(bool)];
            _stream.Read(data, 0, sizeof(bool));
            return BitConverter.ToBoolean(data, 0);
        }

        /// <summary>
        /// Read a byte value from the stream.
        /// </summary>
        /// <returns></returns>
        public byte ReadByte()
        {
            return (byte)(_stream.ReadByte());
        }

        /// <summary>
        /// Read a byte array from the stream.
        /// </summary>
        /// <returns></returns>
        public byte[] ReadBytes()
        {
            var size = ReadInt();
            var data = new byte[size];
            _stream.Read(data, 0, size);
            return data;
        }

        public long[] ReadLongs()
        {
            var data = ReadBytes();
            var result = new long[data.Length / sizeof(long)];
            Buffer.BlockCopy(data, 0, result, 0, data.Length);
            return result;
        }
    }
}