// /***************************************************************************
// Aaru Data Preservation Suite
// ----------------------------------------------------------------------------
//
// Filename       : Hybrid.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Device structures decoders.
//
// --[ Description ] ----------------------------------------------------------
//
//     Decodes SCSI MMC hybrid structures.
//
// --[ License ] --------------------------------------------------------------
//
//     This library is free software; you can redistribute it and/or modify
//     it under the terms of the GNU Lesser General Public License as
//     published by the Free Software Foundation; either version 2.1 of the
//     License, or (at your option) any later version.
//
//     This library is distributed in the hope that it will be useful, but
//     WITHOUT ANY WARRANTY; without even the implied warranty of
//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
//     Lesser General Public License for more details.
//
//     You should have received a copy of the GNU Lesser General Public
//     License along with this library; if not, see <http://www.gnu.org/licenses/>.
//
// ----------------------------------------------------------------------------
// Copyright © 2011-2022 Natalia Portillo
// ****************************************************************************/

namespace Aaru.Decoders.SCSI.MMC;

using System.Diagnostics.CodeAnalysis;
using System.Text;
using Aaru.Helpers;

// Information from the following standards:
// ANSI X3.304-1997
// T10/1048-D revision 9.0
// T10/1048-D revision 10a
// T10/1228-D revision 7.0c
// T10/1228-D revision 11a
// T10/1363-D revision 10g
// T10/1545-D revision 1d
// T10/1545-D revision 5
// T10/1545-D revision 5a
// T10/1675-D revision 2c
// T10/1675-D revision 4
// T10/1836-D revision 2g
[SuppressMessage("ReSharper", "InconsistentNaming"), SuppressMessage("ReSharper", "MemberCanBeInternal"),
 SuppressMessage("ReSharper", "MemberCanBePrivate.Global"), SuppressMessage("ReSharper", "NotAccessedField.Global")]
public static class Hybrid
{
    public static RecognizedFormatLayers? DecodeFormatLayers(byte[] FormatLayersResponse)
    {
        if(FormatLayersResponse == null)
            return null;

        if(FormatLayersResponse.Length < 8)
            return null;

        var decoded = new RecognizedFormatLayers
        {
            DataLength         = BigEndianBitConverter.ToUInt16(FormatLayersResponse, 0),
            Reserved1          = FormatLayersResponse[2],
            Reserved2          = FormatLayersResponse[3],
            NumberOfLayers     = FormatLayersResponse[4],
            Reserved3          = (byte)((FormatLayersResponse[5] & 0xC0) >> 6),
            DefaultFormatLayer = (byte)((FormatLayersResponse[5] & 0x30) >> 4),
            Reserved4          = (byte)((FormatLayersResponse[5] & 0x0C) >> 2),
            OnlineFormatLayer  = (byte)(FormatLayersResponse[5] & 0x03),
            FormatLayers       = new ushort[(FormatLayersResponse.Length - 6) / 2]
        };

        for(var i = 0; i < (FormatLayersResponse.Length - 6) / 2; i++)
            decoded.FormatLayers[i] = BigEndianBitConverter.ToUInt16(FormatLayersResponse, i * 2 + 6);

        return decoded;
    }

    public static string PrettifyFormatLayers(RecognizedFormatLayers? FormatLayersResponse)
    {
        if(FormatLayersResponse == null)
            return null;

        RecognizedFormatLayers response = FormatLayersResponse.Value;

        var sb = new StringBuilder();

        sb.AppendFormat("{0} format layers recognized", response.NumberOfLayers);

        for(var i = 0; i < response.FormatLayers.Length; i++)
            switch(response.FormatLayers[i])
            {
                case (ushort)FormatLayerTypeCodes.BDLayer:
                {
                    sb.AppendFormat("Layer {0} is of type Blu-ray", i).AppendLine();

                    if(response.DefaultFormatLayer == i)
                        sb.AppendLine("This is the default layer.");

                    if(response.OnlineFormatLayer == i)
                        sb.AppendLine("This is the layer actually in use.");

                    break;
                }

                case (ushort)FormatLayerTypeCodes.CDLayer:
                {
                    sb.AppendFormat("Layer {0} is of type CD", i).AppendLine();

                    if(response.DefaultFormatLayer == i)
                        sb.AppendLine("This is the default layer.");

                    if(response.OnlineFormatLayer == i)
                        sb.AppendLine("This is the layer actually in use.");

                    break;
                }

                case (ushort)FormatLayerTypeCodes.DVDLayer:
                {
                    sb.AppendFormat("Layer {0} is of type DVD", i).AppendLine();

                    if(response.DefaultFormatLayer == i)
                        sb.AppendLine("This is the default layer.");

                    if(response.OnlineFormatLayer == i)
                        sb.AppendLine("This is the layer actually in use.");

                    break;
                }

                case (ushort)FormatLayerTypeCodes.HDDVDLayer:
                {
                    sb.AppendFormat("Layer {0} is of type HD DVD", i).AppendLine();

                    if(response.DefaultFormatLayer == i)
                        sb.AppendLine("This is the default layer.");

                    if(response.OnlineFormatLayer == i)
                        sb.AppendLine("This is the layer actually in use.");

                    break;
                }

                default:
                {
                    sb.AppendFormat("Layer {0} is of unknown type 0x{1:X4}", i, response.FormatLayers[i]).AppendLine();

                    if(response.DefaultFormatLayer == i)
                        sb.AppendLine("This is the default layer.");

                    if(response.OnlineFormatLayer == i)
                        sb.AppendLine("This is the layer actually in use.");

                    break;
                }
            }

        return sb.ToString();
    }

    public static string PrettifyFormatLayers(byte[] FormatLayersResponse)
    {
        RecognizedFormatLayers? decoded = DecodeFormatLayers(FormatLayersResponse);

        return PrettifyFormatLayers(decoded);
    }

    public struct RecognizedFormatLayers
    {
        /// <summary>Bytes 0 to 1 Data Length</summary>
        public ushort DataLength;
        /// <summary>Byte 2 Reserved</summary>
        public byte Reserved1;
        /// <summary>Byte 3 Reserved</summary>
        public byte Reserved2;
        /// <summary>Byte 4 Number of format layers in hybrid disc identified by drive</summary>
        public byte NumberOfLayers;
        /// <summary>Byte 5, bits 7 to 6 Reserved</summary>
        public byte Reserved3;
        /// <summary>Byte 5, bits 5 to 4 Layer no. used when disc is inserted</summary>
        public byte DefaultFormatLayer;
        /// <summary>Byte 5, bits 3 to 2 Reserved</summary>
        public byte Reserved4;
        /// <summary>Byte 5, bits 1 to 0 Layer no. currently in use</summary>
        public byte OnlineFormatLayer;
        /// <summary>Bytes 6 to end Recognized format layers</summary>
        public ushort[] FormatLayers;
    }
}