// /***************************************************************************
// Aaru Data Preservation Suite
// ----------------------------------------------------------------------------
//
// Filename       : Write.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Disk image plugins.
//
// --[ Description ] ----------------------------------------------------------
//
//     Writes IBM SaveDskF 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 © 2011-2025 Natalia Portillo
// ****************************************************************************/

using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using Aaru.CommonTypes;
using Aaru.CommonTypes.AaruMetadata;
using Aaru.CommonTypes.Enums;
using Aaru.CommonTypes.Structs;
using Aaru.Helpers;
using Aaru.Logging;

namespace Aaru.Images;

public sealed partial class SaveDskF
{
#region IWritableImage Members

    /// <inheritdoc />
    public bool WriteMediaTag(byte[] data, MediaTagType tag)
    {
        ErrorMessage = Localization.Writing_media_tags_is_not_supported;

        return false;
    }

    /// <inheritdoc />
    public bool WriteSector(byte[] data, ulong sectorAddress)
    {
        if(!IsWriting)
        {
            ErrorMessage = Localization.Tried_to_write_on_a_non_writable_image;

            return false;
        }

        if(data.Length != _imageInfo.SectorSize)
        {
            ErrorMessage = Localization.Incorrect_data_size;

            return false;
        }

        if(sectorAddress >= _imageInfo.Sectors)
        {
            ErrorMessage = Localization.Tried_to_write_past_image_size;

            return false;
        }

        _writingStream.Seek((long)(512 + sectorAddress * _imageInfo.SectorSize), SeekOrigin.Begin);
        _writingStream.Write(data, 0, data.Length);

        ErrorMessage = "";

        return true;
    }

    /// <inheritdoc />
    public bool WriteSectors(byte[] data, ulong sectorAddress, uint length)
    {
        if(!IsWriting)
        {
            ErrorMessage = Localization.Tried_to_write_on_a_non_writable_image;

            return false;
        }

        if(data.Length % _imageInfo.SectorSize != 0)
        {
            ErrorMessage = Localization.Incorrect_data_size;

            return false;
        }

        if(sectorAddress + length > _imageInfo.Sectors)
        {
            ErrorMessage = Localization.Tried_to_write_past_image_size;

            return false;
        }

        _writingStream.Seek((long)(512 + sectorAddress * _imageInfo.SectorSize), SeekOrigin.Begin);
        _writingStream.Write(data, 0, data.Length);

        ErrorMessage = "";

        return true;
    }

    /// <inheritdoc />
    public bool WriteSectorLong(byte[] data, ulong sectorAddress)
    {
        ErrorMessage = Localization.Writing_sectors_with_tags_is_not_supported;

        return false;
    }

    /// <inheritdoc />
    public bool WriteSectorsLong(byte[] data, ulong sectorAddress, uint length)
    {
        ErrorMessage = Localization.Writing_sectors_with_tags_is_not_supported;

        return false;
    }

    /// <inheritdoc />
    public bool Close()
    {
        if(!IsWriting)
        {
            ErrorMessage = Localization.Image_is_not_opened_for_writing;

            return false;
        }

        if(!string.IsNullOrWhiteSpace(_imageInfo.Comments))
        {
            byte[] commentsBytes = Encoding.GetEncoding("ibm437").GetBytes(_imageInfo.Comments);
            _header.commentOffset = (ushort)Marshal.SizeOf<Header>();
            _writingStream.Seek(_header.commentOffset, SeekOrigin.Begin);

            _writingStream.Write(commentsBytes,
                                 0,
                                 commentsBytes.Length >= 512 - _header.commentOffset
                                     ? 512 - _header.commentOffset
                                     : commentsBytes.Length);
        }

        byte[] hdr    = new byte[Marshal.SizeOf<Header>()];
        nint   hdrPtr = System.Runtime.InteropServices.Marshal.AllocHGlobal(Marshal.SizeOf<Header>());
        System.Runtime.InteropServices.Marshal.StructureToPtr(_header, hdrPtr, true);
        System.Runtime.InteropServices.Marshal.Copy(hdrPtr, hdr, 0, hdr.Length);
        System.Runtime.InteropServices.Marshal.FreeHGlobal(hdrPtr);

        _writingStream.Seek(0, SeekOrigin.Begin);
        _writingStream.Write(hdr, 0, hdr.Length);

        _header.checksum = 0;
        _writingStream.Seek(0, SeekOrigin.Begin);

        int b;

        do
        {
            b = _writingStream.ReadByte();

            if(b >= 0) _header.checksum += (uint)b;
        } while(b >= 0);

        hdr    = new byte[Marshal.SizeOf<Header>()];
        hdrPtr = System.Runtime.InteropServices.Marshal.AllocHGlobal(Marshal.SizeOf<Header>());
        System.Runtime.InteropServices.Marshal.StructureToPtr(_header, hdrPtr, true);
        System.Runtime.InteropServices.Marshal.Copy(hdrPtr, hdr, 0, hdr.Length);
        System.Runtime.InteropServices.Marshal.FreeHGlobal(hdrPtr);

        _writingStream.Seek(0, SeekOrigin.Begin);
        _writingStream.Write(hdr, 0, hdr.Length);

        _writingStream.Flush();
        _writingStream.Close();

        IsWriting    = false;
        ErrorMessage = "";

        return true;
    }

    /// <inheritdoc />
    public bool SetImageInfo(ImageInfo imageInfo)
    {
        _imageInfo.Comments = imageInfo.Comments;

        return true;
    }

    /// <inheritdoc />
    public bool Create(string path, MediaType mediaType, Dictionary<string, string> options, ulong sectors,
                       uint   sectorSize)
    {
        if(sectorSize == 0)
        {
            ErrorMessage = Localization.Unsupported_sector_size;

            return false;
        }

        if(sectors > ushort.MaxValue)
        {
            ErrorMessage = Localization.Too_many_sectors;

            return false;
        }

        if(!SupportedMediaTypes.Contains(mediaType))
        {
            ErrorMessage = string.Format(Localization.Unsupported_media_format_0, mediaType);

            return false;
        }

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

        try
        {
            _writingStream = new FileStream(path, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None);
        }
        catch(IOException ex)
        {
            ErrorMessage = string.Format(Localization.Could_not_create_new_image_file_exception_0, ex.Message);
            AaruLogging.Exception(ex, Localization.Could_not_create_new_image_file_exception_0, ex.Message);

            return false;
        }

        (ushort cylinders, byte heads, ushort sectorsPerTrack, uint bytesPerSector, MediaEncoding encoding, bool
            variableSectorsPerTrack, MediaType type) geometry = Geometry.GetGeometry(mediaType);

        _header = new Header
        {
            cylinders       = geometry.cylinders,
            dataOffset      = 512,
            heads           = geometry.heads,
            magic           = SDF_MAGIC,
            sectorsCopied   = (ushort)sectors,
            sectorsPerTrack = geometry.sectorsPerTrack,
            sectorSize      = (ushort)sectorSize
        };

        IsWriting    = true;
        ErrorMessage = null;

        return true;
    }

    /// <inheritdoc />
    public bool SetGeometry(uint cylinders, uint heads, uint sectorsPerTrack) => true;

    /// <inheritdoc />
    public bool WriteSectorTag(byte[] data, ulong sectorAddress, SectorTagType tag)
    {
        ErrorMessage = Localization.Unsupported_feature;

        return false;
    }

    /// <inheritdoc />
    public bool WriteSectorsTag(byte[] data, ulong sectorAddress, uint length, SectorTagType tag)
    {
        ErrorMessage = Localization.Unsupported_feature;

        return false;
    }

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

    /// <inheritdoc />
    public bool SetMetadata(Metadata metadata) => false;

#endregion
}