// /***************************************************************************
// Aaru Data Preservation Suite
// ----------------------------------------------------------------------------
//
// Filename       : CHD.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Disc image plugins.
//
// --[ Description ] ----------------------------------------------------------
//
//     Manages MAME Compressed Hunks of Data disk images.
//
// --[ 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 © 2011-2026 Natalia Portillo
// ****************************************************************************/

using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.IO;
using Aaru.CommonTypes;
using Aaru.CommonTypes.Interfaces;
using Aaru.CommonTypes.Structs;
using Aaru.Decoders.CD;

namespace Aaru.Images;

// TODO: Implement PCMCIA support
/// <inheritdoc cref="Aaru.CommonTypes.Interfaces.IOpticalMediaImage" />
/// <summary>Implements reading MAME CHD disk images</summary>
[SuppressMessage("ReSharper", "NotAccessedField.Local")]
public sealed partial class Chd : IOpticalMediaImage, IVerifiableImage
{
    const string MODULE_NAME = "CHD plugin";
    /// <summary>"MComprHD"</summary>
    readonly byte[] _chdTag = "MComprHD"u8.ToArray();
    uint                      _bytesPerHunk;
    byte[]                    _cis;
    byte[]                    _expectedChecksum;
    uint                      _hdrCompression;
    uint                      _hdrCompression1;
    uint                      _hdrCompression2;
    uint                      _hdrCompression3;
    Dictionary<ulong, byte[]> _hunkCache;
    byte[]                    _hunkMap;
    ulong[]                   _hunkTable;
    uint[]                    _hunkTableSmall;
    byte[]                    _identify;
    ImageInfo                 _imageInfo;
    Stream                    _imageStream;
    bool                      _isCdrom;
    bool                      _isGdrom;
    bool                      _isHdd;
    uint                      _mapVersion;
    int                       _maxBlockCache;
    int                       _maxSectorCache;
    Dictionary<ulong, uint>   _offsetmap;
    List<Partition>           _partitions;
    byte[]                    _rawMap;
    SectorBuilder             _sectorBuilder;
    Dictionary<ulong, byte[]> _sectorCache;
    uint                      _sectorsPerHunk;
    bool                      _swapAudio;
    uint                      _totalHunks;
    Dictionary<uint, Track>   _tracks;
    uint                      _unitBytes;

    public Chd() => _imageInfo = new ImageInfo
    {
        ReadableSectorTags    = [],
        ReadableMediaTags     = [],
        HasPartitions         = false,
        HasSessions           = false,
        Application           = "MAME",
        Creator               = null,
        Comments              = null,
        MediaManufacturer     = null,
        MediaModel            = null,
        MediaSerialNumber     = null,
        MediaBarcode          = null,
        MediaPartNumber       = null,
        MediaSequence         = 0,
        LastMediaSequence     = 0,
        DriveManufacturer     = null,
        DriveModel            = null,
        DriveSerialNumber     = null,
        DriveFirmwareRevision = null
    };
}