using Ryujinx.HLE.Exceptions;
using System.IO;

namespace Ryujinx.HLE.Loaders.Npdm
{
    public class Acid
    {
        private const int AcidMagic = 'A' << 0 | 'C' << 8 | 'I' << 16 | 'D' << 24;

        public byte[] Rsa2048Signature { get; private set; }
        public byte[] Rsa2048Modulus   { get; private set; }
        public int    Unknown1         { get; private set; }
        public int    Flags            { get; private set; }

        public long TitleIdRangeMin { get; private set; }
        public long TitleIdRangeMax { get; private set; }

        public FsAccessControl      FsAccessControl      { get; private set; }
        public ServiceAccessControl ServiceAccessControl { get; private set; }
        public KernelAccessControl  KernelAccessControl  { get; private set; }

        public Acid(Stream stream, int offset)
        {
            stream.Seek(offset, SeekOrigin.Begin);

            BinaryReader reader = new BinaryReader(stream);

            Rsa2048Signature = reader.ReadBytes(0x100);
            Rsa2048Modulus   = reader.ReadBytes(0x100);

            if (reader.ReadInt32() != AcidMagic)
            {
                throw new InvalidNpdmException("ACID Stream doesn't contain ACID section!");
            }

            // Size field used with the above signature (?).
            Unknown1 = reader.ReadInt32();

            reader.ReadInt32();

            // Bit0 must be 1 on retail, on devunit 0 is also allowed. Bit1 is unknown.
            Flags = reader.ReadInt32();

            TitleIdRangeMin = reader.ReadInt64();
            TitleIdRangeMax = reader.ReadInt64();

            int fsAccessControlOffset      = reader.ReadInt32();
            int fsAccessControlSize        = reader.ReadInt32();
            int serviceAccessControlOffset = reader.ReadInt32();
            int serviceAccessControlSize   = reader.ReadInt32();
            int kernelAccessControlOffset  = reader.ReadInt32();
            int kernelAccessControlSize    = reader.ReadInt32();

            FsAccessControl = new FsAccessControl(stream, offset + fsAccessControlOffset, fsAccessControlSize);

            ServiceAccessControl = new ServiceAccessControl(stream, offset + serviceAccessControlOffset, serviceAccessControlSize);

            KernelAccessControl = new KernelAccessControl(stream, offset + kernelAccessControlOffset, kernelAccessControlSize);
        }
    }
}