// /***************************************************************************
// Aaru Data Preservation Suite
// ----------------------------------------------------------------------------
//
// Filename       : Write.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Disk image plugins.
//
// --[ Description ] ----------------------------------------------------------
//
//     Writes cdrdao cuesheets (toc/bin).
//
// --[ 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.DiscImages;

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using Aaru.CommonTypes;
using Aaru.CommonTypes.Enums;
using Aaru.CommonTypes.Structs;
using Schemas;
using TrackType = Aaru.CommonTypes.Enums.TrackType;

public sealed partial class Cdrdao
{
    /// <inheritdoc />
    public bool Create(string path, MediaType mediaType, Dictionary<string, string> options, ulong sectors,
                       uint sectorSize)
    {
        if(options != null)
        {
            if(options.TryGetValue("separate", out string tmpValue))
            {
                if(!bool.TryParse(tmpValue, out _separateTracksWriting))
                {
                    ErrorMessage = "Invalid value for split option";

                    return false;
                }

                if(_separateTracksWriting)
                {
                    ErrorMessage = "Separate tracks not yet implemented";

                    return false;
                }
            }
        }
        else
            _separateTracksWriting = false;

        if(!SupportedMediaTypes.Contains(mediaType))
        {
            ErrorMessage = $"Unsupported media format {mediaType}";

            return false;
        }

        _imageInfo = new ImageInfo
        {
            MediaType  = mediaType,
            SectorSize = sectorSize,
            Sectors    = sectors
        };

        // TODO: Separate tracks
        try
        {
            _writingBaseName = Path.Combine(Path.GetDirectoryName(path) ?? "", Path.GetFileNameWithoutExtension(path));

            _descriptorStream = new StreamWriter(path, false, Encoding.ASCII);
        }
        catch(IOException e)
        {
            ErrorMessage = $"Could not create new image file, exception {e.Message}";

            return false;
        }

        _discimage = new CdrdaoDisc
        {
            Disktype = mediaType,
            Tracks   = new List<CdrdaoTrack>()
        };

        _trackFlags = new Dictionary<byte, byte>();
        _trackIsrcs = new Dictionary<byte, string>();

        IsWriting    = true;
        ErrorMessage = null;

        return true;
    }

    /// <inheritdoc />
    public bool WriteMediaTag(byte[] data, MediaTagType tag)
    {
        if(!IsWriting)
        {
            ErrorMessage = "Tried to write on a non-writable image";

            return false;
        }

        switch(tag)
        {
            case MediaTagType.CD_MCN:
                _discimage.Mcn = Encoding.ASCII.GetString(data);

                return true;
            default:
                ErrorMessage = $"Unsupported media tag {tag}";

                return false;
        }
    }

    /// <inheritdoc />
    public bool WriteSector(byte[] data, ulong sectorAddress)
    {
        if(!IsWriting)
        {
            ErrorMessage = "Tried to write on a non-writable image";

            return false;
        }

        Track track =
            _writingTracks.FirstOrDefault(trk => sectorAddress >= trk.StartSector && sectorAddress <= trk.EndSector);

        if(track is null)
        {
            ErrorMessage = $"Can't found track containing {sectorAddress}";

            return false;
        }

        FileStream trackStream = _writingStreams.FirstOrDefault(kvp => kvp.Key == track.Sequence).Value;

        if(trackStream == null)
        {
            ErrorMessage = $"Can't found file containing {sectorAddress}";

            return false;
        }

        if(track.BytesPerSector != track.RawBytesPerSector)
        {
            ErrorMessage = "Invalid write mode for this sector";

            return false;
        }

        if(data.Length != track.RawBytesPerSector)
        {
            ErrorMessage = "Incorrect data size";

            return false;
        }

        // cdrdao audio tracks are endian swapped corresponding to Aaru
        if(track.Type == TrackType.Audio)
        {
            var swapped = new byte[data.Length];

            for(long i = 0; i < swapped.Length; i += 2)
            {
                swapped[i] = data[i + 1];
                swapped[i           + 1] = data[i];
            }

            data = swapped;
        }

        trackStream.
            Seek((long)(track.FileOffset + (sectorAddress - track.StartSector) * (ulong)track.RawBytesPerSector),
                 SeekOrigin.Begin);

        trackStream.Write(data, 0, data.Length);

        return true;
    }

    /// <inheritdoc />
    public bool WriteSectors(byte[] data, ulong sectorAddress, uint length)
    {
        if(!IsWriting)
        {
            ErrorMessage = "Tried to write on a non-writable image";

            return false;
        }

        Track track =
            _writingTracks.FirstOrDefault(trk => sectorAddress >= trk.StartSector && sectorAddress <= trk.EndSector);

        if(track is null)
        {
            ErrorMessage = $"Can't found track containing {sectorAddress}";

            return false;
        }

        FileStream trackStream = _writingStreams.FirstOrDefault(kvp => kvp.Key == track.Sequence).Value;

        if(trackStream == null)
        {
            ErrorMessage = $"Can't found file containing {sectorAddress}";

            return false;
        }

        if(track.BytesPerSector != track.RawBytesPerSector)
        {
            ErrorMessage = "Invalid write mode for this sector";

            return false;
        }

        if(sectorAddress + length > track.EndSector + 1)
        {
            ErrorMessage = "Can't cross tracks";

            return false;
        }

        if(data.Length % track.RawBytesPerSector != 0)
        {
            ErrorMessage = "Incorrect data size";

            return false;
        }

        // cdrdao audio tracks are endian swapped corresponding to Aaru
        if(track.Type == TrackType.Audio)
        {
            var swapped = new byte[data.Length];

            for(long i = 0; i < swapped.Length; i += 2)
            {
                swapped[i] = data[i + 1];
                swapped[i           + 1] = data[i];
            }

            data = swapped;
        }

        switch(track.SubchannelType)
        {
            case TrackSubchannelType.None:
                trackStream.
                    Seek((long)(track.FileOffset + (sectorAddress - track.StartSector) * (ulong)track.RawBytesPerSector),
                         SeekOrigin.Begin);

                trackStream.Write(data, 0, data.Length);

                ErrorMessage = "";

                return true;
            case TrackSubchannelType.Raw:
            case TrackSubchannelType.RawInterleaved:
                trackStream.
                    Seek((long)(track.FileOffset + (sectorAddress - track.StartSector) * (ulong)(track.RawBytesPerSector + 96)),
                         SeekOrigin.Begin);

                for(uint i = 0; i < length; i++)
                {
                    trackStream.Write(data, (int)(i * track.RawBytesPerSector), track.RawBytesPerSector);
                    trackStream.Position += 96;
                }

                ErrorMessage = "";

                return true;
            default:
                ErrorMessage = "Invalid subchannel mode for this sector";

                return false;
        }
    }

    /// <inheritdoc />
    public bool WriteSectorLong(byte[] data, ulong sectorAddress)
    {
        if(!IsWriting)
        {
            ErrorMessage = "Tried to write on a non-writable image";

            return false;
        }

        Track track =
            _writingTracks.FirstOrDefault(trk => sectorAddress >= trk.StartSector && sectorAddress <= trk.EndSector);

        if(track is null)
        {
            ErrorMessage = $"Can't found track containing {sectorAddress}";

            return false;
        }

        FileStream trackStream = _writingStreams.FirstOrDefault(kvp => kvp.Key == track.Sequence).Value;

        if(trackStream == null)
        {
            ErrorMessage = $"Can't found file containing {sectorAddress}";

            return false;
        }

        if(data.Length != track.RawBytesPerSector)
        {
            ErrorMessage = "Incorrect data size";

            return false;
        }

        // cdrdao audio tracks are endian swapped corresponding to Aaru
        if(track.Type == TrackType.Audio)
        {
            var swapped = new byte[data.Length];

            for(long i = 0; i < swapped.Length; i += 2)
            {
                swapped[i] = data[i + 1];
                swapped[i           + 1] = data[i];
            }

            data = swapped;
        }

        var subchannelSize = (uint)(track.SubchannelType != TrackSubchannelType.None ? 96 : 0);

        trackStream.
            Seek((long)(track.FileOffset + (sectorAddress - track.StartSector) * (ulong)(track.RawBytesPerSector + subchannelSize)),
                 SeekOrigin.Begin);

        trackStream.Write(data, 0, data.Length);

        return true;
    }

    /// <inheritdoc />
    public bool WriteSectorsLong(byte[] data, ulong sectorAddress, uint length)
    {
        if(!IsWriting)
        {
            ErrorMessage = "Tried to write on a non-writable image";

            return false;
        }

        Track track =
            _writingTracks.FirstOrDefault(trk => sectorAddress >= trk.StartSector && sectorAddress <= trk.EndSector);

        if(track is null)
        {
            ErrorMessage = $"Can't found track containing {sectorAddress}";

            return false;
        }

        FileStream trackStream = _writingStreams.FirstOrDefault(kvp => kvp.Key == track.Sequence).Value;

        if(trackStream == null)
        {
            ErrorMessage = $"Can't found file containing {sectorAddress}";

            return false;
        }

        if(sectorAddress + length > track.EndSector + 1)
        {
            ErrorMessage = "Can't cross tracks";

            return false;
        }

        if(data.Length % track.RawBytesPerSector != 0)
        {
            ErrorMessage = "Incorrect data size";

            return false;
        }

        // cdrdao audio tracks are endian swapped corresponding to Aaru
        if(track.Type == TrackType.Audio)
        {
            var swapped = new byte[data.Length];

            for(long i = 0; i < swapped.Length; i += 2)
            {
                swapped[i] = data[i + 1];
                swapped[i           + 1] = data[i];
            }

            data = swapped;
        }

        var subchannelSize = (uint)(track.SubchannelType != TrackSubchannelType.None ? 96 : 0);

        for(uint i = 0; i < length; i++)
        {
            trackStream.
                Seek((long)(track.FileOffset + (i + sectorAddress - track.StartSector) * (ulong)(track.RawBytesPerSector + subchannelSize)),
                     SeekOrigin.Begin);

            trackStream.Write(data, (int)(i * track.RawBytesPerSector), track.RawBytesPerSector);
        }

        return true;
    }

    /// <inheritdoc />
    public bool SetTracks(List<Track> tracks)
    {
        if(!IsWriting)
        {
            ErrorMessage = "Tried to write on a non-writable image";

            return false;
        }

        if(tracks       == null ||
           tracks.Count == 0)
        {
            ErrorMessage = "Invalid tracks sent";

            return false;
        }

        if(_writingTracks  != null &&
           _writingStreams != null)
            foreach(FileStream oldTrack in _writingStreams.Select(t => t.Value).Distinct())
                oldTrack.Close();

        ulong currentOffset = 0;
        _writingTracks = new List<Track>();

        foreach(Track track in tracks.OrderBy(t => t.Sequence))
        {
            if(track.SubchannelType == TrackSubchannelType.Q16 ||
               track.SubchannelType == TrackSubchannelType.Q16Interleaved)
            {
                ErrorMessage = $"Unsupported subchannel type {track.SubchannelType} for track {track.Sequence}";

                return false;
            }

            Track newTrack = track;

            newTrack.File = _separateTracksWriting ? _writingBaseName + $"_track{track.Sequence:D2}.bin"
                                : _writingBaseName                    + ".bin";

            newTrack.FileOffset = _separateTracksWriting ? 0 : currentOffset;
            _writingTracks.Add(newTrack);

            currentOffset += (ulong)newTrack.RawBytesPerSector * (newTrack.EndSector - newTrack.StartSector + 1);

            if(track.SubchannelType != TrackSubchannelType.None)
                currentOffset += 96 * (newTrack.EndSector - newTrack.StartSector + 1);
        }

        _writingStreams = new Dictionary<uint, FileStream>();

        if(_separateTracksWriting)
            foreach(Track track in _writingTracks)
                _writingStreams.Add(track.Sequence,
                                    new FileStream(track.File, FileMode.OpenOrCreate, FileAccess.ReadWrite,
                                                   FileShare.None));
        else
        {
            var jointStream = new FileStream(_writingBaseName + ".bin", FileMode.OpenOrCreate, FileAccess.ReadWrite,
                                             FileShare.None);

            foreach(Track track in _writingTracks)
                _writingStreams.Add(track.Sequence, jointStream);
        }

        return true;
    }

    /// <inheritdoc />
    public bool Close()
    {
        if(!IsWriting)
        {
            ErrorMessage = "Image is not opened for writing";

            return false;
        }

        if(_separateTracksWriting)
            foreach(FileStream writingStream in _writingStreams.Values)
            {
                writingStream.Flush();
                writingStream.Close();
            }
        else
        {
            _writingStreams.First().Value.Flush();
            _writingStreams.First().Value.Close();
        }

        bool data = _writingTracks.Count(t => t.Type != TrackType.Audio) > 0;

        bool mode2 = _writingTracks.Count(t => t.Type == TrackType.CdMode2Form1 || t.Type == TrackType.CdMode2Form2 ||
                                               t.Type == TrackType.CdMode2Formless) > 0;

        if(mode2)
            _descriptorStream.WriteLine("CD_ROM_XA");
        else if(data)
            _descriptorStream.WriteLine("CD_ROM");
        else
            _descriptorStream.WriteLine("CD_DA");

        if(!string.IsNullOrWhiteSpace(_discimage.Comment))
        {
            string[] commentLines = _discimage.Comment.Split(new[]
            {
                '\n'
            }, StringSplitOptions.RemoveEmptyEntries);

            foreach(string line in commentLines)
                _descriptorStream.WriteLine("// {0}", line);
        }

        _descriptorStream.WriteLine();

        if(!string.IsNullOrEmpty(_discimage.Mcn))
            _descriptorStream.WriteLine("CATALOG {0}", _discimage.Mcn);

        foreach(Track track in _writingTracks)
        {
            _descriptorStream.WriteLine();
            _descriptorStream.WriteLine("// Track {0}", track.Sequence);

            string subchannelType;

            switch(track.SubchannelType)
            {
                case TrackSubchannelType.Packed:
                case TrackSubchannelType.PackedInterleaved:
                    subchannelType = " RW";

                    break;
                case TrackSubchannelType.Raw:
                case TrackSubchannelType.RawInterleaved:
                    subchannelType = " RW_RAW";

                    break;
                default:
                    subchannelType = "";

                    break;
            }

            _descriptorStream.WriteLine("TRACK {0}{1}", GetTrackMode(track), subchannelType);

            _trackFlags.TryGetValue((byte)track.Sequence, out byte flagsByte);

            var flags = (CdFlags)flagsByte;

            _descriptorStream.WriteLine("{0}COPY", flags.HasFlag(CdFlags.CopyPermitted) ? "" : "NO ");

            if(track.Type == TrackType.Audio)
            {
                _descriptorStream.WriteLine("{0}PRE_EMPHASIS", flags.HasFlag(CdFlags.PreEmphasis) ? "" : "NO ");

                _descriptorStream.WriteLine("{0}_CHANNEL_AUDIO", flags.HasFlag(CdFlags.FourChannel) ? "FOUR" : "TWO");
            }

            if(_trackIsrcs.TryGetValue((byte)track.Sequence, out string isrc) &&
               !string.IsNullOrWhiteSpace(isrc))
                _descriptorStream.WriteLine("ISRC {0}", isrc);

            (byte minute, byte second, byte frame) msf = LbaToMsf(track.EndSector - track.StartSector + 1);

            _descriptorStream.WriteLine("DATAFILE \"{0}\" #{1} {2:D2}:{3:D2}:{4:D2} // length in bytes: {5}",
                                        Path.GetFileName(track.File), track.FileOffset, msf.minute, msf.second,
                                        msf.frame,
                                        (track.EndSector - track.StartSector + 1) *
                                        (ulong)(track.RawBytesPerSector +
                                                (track.SubchannelType != TrackSubchannelType.None ? 96 : 0)));

            foreach(KeyValuePair<ushort, int> index in track.Indexes.OrderBy(i => i.Key).Where(i => i.Key > 1))
            {
                msf = LbaToMsf((ulong)index.Value - (track.Pregap + track.StartSector));

                _descriptorStream.WriteLine("INDEX {0:D2}:{1:D2}:{2:D2}", msf.minute, msf.second, msf.frame);
            }

            _descriptorStream.WriteLine();
        }

        _descriptorStream.Flush();
        _descriptorStream.Close();

        IsWriting    = false;
        ErrorMessage = "";

        return true;
    }

    /// <inheritdoc />
    public bool SetMetadata(ImageInfo metadata)
    {
        _discimage.Barcode = metadata.MediaBarcode;
        _discimage.Comment = metadata.Comments;

        return true;
    }

    /// <inheritdoc />
    public bool SetGeometry(uint cylinders, uint heads, uint sectorsPerTrack)
    {
        ErrorMessage = "Unsupported feature";

        return false;
    }

    /// <inheritdoc />
    public bool WriteSectorTag(byte[] data, ulong sectorAddress, SectorTagType tag)
    {
        if(!IsWriting)
        {
            ErrorMessage = "Tried to write on a non-writable image";

            return false;
        }

        Track track =
            _writingTracks.FirstOrDefault(trk => sectorAddress >= trk.StartSector && sectorAddress <= trk.EndSector);

        if(track is null)
        {
            ErrorMessage = $"Can't found track containing {sectorAddress}";

            return false;
        }

        switch(tag)
        {
            case SectorTagType.CdTrackFlags:
            {
                if(data.Length != 1)
                {
                    ErrorMessage = "Incorrect data size for track flags";

                    return false;
                }

                _trackFlags[(byte)sectorAddress] = data[0];

                return true;
            }
            case SectorTagType.CdTrackIsrc:
            {
                if(data != null)
                    _trackIsrcs[(byte)sectorAddress] = Encoding.UTF8.GetString(data);

                return true;
            }
            case SectorTagType.CdSectorSubchannel:
            {
                if(track.SubchannelType == 0)
                {
                    ErrorMessage =
                        $"Trying to write subchannel to track {track.Sequence}, that does not have subchannel";

                    return false;
                }

                if(data.Length != 96)
                {
                    ErrorMessage = "Incorrect data size for subchannel";

                    return false;
                }

                FileStream trackStream = _writingStreams.FirstOrDefault(kvp => kvp.Key == track.Sequence).Value;

                if(trackStream == null)
                {
                    ErrorMessage = $"Can't found file containing {sectorAddress}";

                    return false;
                }

                trackStream.
                    Seek((long)(track.FileOffset + (sectorAddress - track.StartSector) * (ulong)(track.RawBytesPerSector + 96)) + track.RawBytesPerSector,
                         SeekOrigin.Begin);

                trackStream.Write(data, 0, data.Length);

                return true;
            }
            default:
                ErrorMessage = $"Unsupported tag type {tag}";

                return false;
        }
    }

    /// <inheritdoc />
    public bool WriteSectorsTag(byte[] data, ulong sectorAddress, uint length, SectorTagType tag)
    {
        if(!IsWriting)
        {
            ErrorMessage = "Tried to write on a non-writable image";

            return false;
        }

        Track track =
            _writingTracks.FirstOrDefault(trk => sectorAddress >= trk.StartSector && sectorAddress <= trk.EndSector);

        if(track is null)
        {
            ErrorMessage = $"Can't found track containing {sectorAddress}";

            return false;
        }

        switch(tag)
        {
            case SectorTagType.CdTrackFlags:
            case SectorTagType.CdTrackIsrc: return WriteSectorTag(data, sectorAddress, tag);
            case SectorTagType.CdSectorSubchannel:
            {
                if(track.SubchannelType == 0)
                {
                    ErrorMessage =
                        $"Trying to write subchannel to track {track.Sequence}, that does not have subchannel";

                    return false;
                }

                if(data.Length % 96 != 0)
                {
                    ErrorMessage = "Incorrect data size for subchannel";

                    return false;
                }

                FileStream trackStream = _writingStreams.FirstOrDefault(kvp => kvp.Key == track.Sequence).Value;

                if(trackStream == null)
                {
                    ErrorMessage = $"Can't found file containing {sectorAddress}";

                    return false;
                }

                for(uint i = 0; i < length; i++)
                {
                    trackStream.
                        Seek((long)(track.FileOffset + (i + sectorAddress - track.StartSector) * (ulong)(track.RawBytesPerSector + 96)) + track.RawBytesPerSector,
                             SeekOrigin.Begin);

                    trackStream.Write(data, (int)(i * 96), 96);
                }

                return true;
            }
            default:
                ErrorMessage = $"Unsupported tag type {tag}";

                return false;
        }
    }

    /// <inheritdoc />
    public bool SetDumpHardware(List<DumpHardwareType> dumpHardware) => false;

    /// <inheritdoc />
    public bool SetCicmMetadata(CICMMetadataType metadata) => false;
}