using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Collections;

namespace MatrixIO.IO.Bmff
{
    public abstract class FullBox : Box
    {
        public byte Version { get; set; }

        protected uint _Flags;
        public BitArray Flags 
        { 
            get 
            {
                byte[] flagBytes32 = BitConverter.GetBytes(_Flags.HostToNetworkOrder());
                byte[] flagBytes24 = new byte[3];
                Buffer.BlockCopy(flagBytes32, 1, flagBytes24, 0, 3);
                return new BitArray(flagBytes24); 
            } 
        }

        protected FullBox() : this(0) { }
        protected FullBox(byte version, uint flags = 0) : base() 
        {
            if ((flags & 0xFF000000) > 0) throw new FormatException("Box flags must be 24 bits.");

            Version = version;
            _Flags = flags;
        }
        
        protected FullBox(Stream stream) : base(stream) { }

        internal override ulong CalculateSize()
        {
            return base.CalculateSize() + 4;
        }

        protected override void LoadFromStream(Stream stream)
        {
            base.LoadFromStream(stream);

            Version = stream.ReadOneByte();
            _Flags = stream.ReadBEUInt24();
        }

        protected override void SaveToStream(Stream stream)
        {
            base.SaveToStream(stream);

            stream.WriteOneByte(Version);
            stream.WriteBEUInt24(_Flags);
        }
    }
}