// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// Filename       : RayDIM.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Component
//
// --[ Description ] ----------------------------------------------------------
//
//     Description
//
// --[ 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 © 2011-2017 Natalia Portillo
// ****************************************************************************/

using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.InteropServices;
using System.Text.RegularExpressions;
using DiscImageChef.CommonTypes;
using DiscImageChef.Console;
using DiscImageChef.Filters;

namespace DiscImageChef.ImagePlugins
{
	public class RayDIM : ImagePlugin
	{
		#region Internal Structures

		[StructLayout(LayoutKind.Sequential, Pack = 1)]
		struct RayHdr
		{
			[MarshalAs(UnmanagedType.ByValArray, SizeConst = 80)]
			public byte[] signature;
			public RayDiskTypes diskType;
			public byte cylinders;
			public byte sectorsPerTrack;
			public byte heads;
		}

		enum RayDiskTypes : byte
		{
			Md2dd = 1,
			Md2hd = 2,
			Mf2dd = 3,
			Mf2hd = 4,
			Mf2ed = 5
		}
		#endregion

		readonly string DimSignatureRegEx = "Disk IMage VER (?<major>\\d).(?<minor>\\d) Copyright \\(C\\) (?<year>\\d{4}) Ray Arachelian, All Rights Reserved\\.";

		#region Internal variables

		MemoryStream disk;

		#endregion

		public RayDIM()
		{
			Name = "Ray Arachelian's Disk IMage";
			PluginUUID = new Guid("F541F4E7-C1E3-4A2D-B07F-D863E87AB961");
			ImageInfo = new ImageInfo();
			ImageInfo.readableSectorTags = new List<SectorTagType>();
			ImageInfo.readableMediaTags = new List<MediaTagType>();
			ImageInfo.imageHasPartitions = false;
			ImageInfo.imageHasSessions = false;
			ImageInfo.imageApplication = "Ray Arachelian's Disk IMage";
			ImageInfo.imageCreator = null;
			ImageInfo.imageComments = null;
			ImageInfo.mediaManufacturer = null;
			ImageInfo.mediaModel = null;
			ImageInfo.mediaSerialNumber = null;
			ImageInfo.mediaBarcode = null;
			ImageInfo.mediaPartNumber = null;
			ImageInfo.mediaSequence = 0;
			ImageInfo.lastMediaSequence = 0;
			ImageInfo.driveManufacturer = null;
			ImageInfo.driveModel = null;
			ImageInfo.driveSerialNumber = null;
			ImageInfo.driveFirmwareRevision = null;
		}

		public override bool IdentifyImage(Filter imageFilter)
		{
			Stream stream = imageFilter.GetDataForkStream();

			if(stream.Length < Marshal.SizeOf(typeof(RayHdr)))
				return false;

			byte[] buffer = new byte[Marshal.SizeOf(typeof(RayHdr))];
			stream.Seek(0, SeekOrigin.Begin);
			stream.Read(buffer, 0, buffer.Length);

			RayHdr header = new RayHdr();
			IntPtr ftrPtr = Marshal.AllocHGlobal(buffer.Length);
			Marshal.Copy(buffer, 0, ftrPtr, buffer.Length);
			header = (RayHdr)Marshal.PtrToStructure(ftrPtr, typeof(RayHdr));
			Marshal.FreeHGlobal(ftrPtr);

			string signature = StringHandlers.CToString(header.signature);

			DicConsole.DebugWriteLine("Ray Arachelian's Disk IMage plugin", "header.signature = {0}", signature);
			DicConsole.DebugWriteLine("Ray Arachelian's Disk IMage plugin", "header.diskType = {0}", header.diskType);
			DicConsole.DebugWriteLine("Ray Arachelian's Disk IMage plugin", "header.heads = {0}", header.heads);
			DicConsole.DebugWriteLine("Ray Arachelian's Disk IMage plugin", "header.cylinders = {0}", header.cylinders);
			DicConsole.DebugWriteLine("Ray Arachelian's Disk IMage plugin", "header.sectorsPerTrack = {0}", header.sectorsPerTrack);

			Regex sx = new Regex(DimSignatureRegEx);
			Match sm = sx.Match(signature);

			DicConsole.DebugWriteLine("Ray Arachelian's Disk IMage plugin", "header.signature matches? = {0}", sm.Success);

			return sm.Success;
		}

		public override bool OpenImage(Filter imageFilter)
		{
			Stream stream = imageFilter.GetDataForkStream();

			if(stream.Length < Marshal.SizeOf(typeof(RayHdr)))
				return false;

			byte[] buffer = new byte[Marshal.SizeOf(typeof(RayHdr))];
			stream.Seek(0, SeekOrigin.Begin);
			stream.Read(buffer, 0, buffer.Length);

			RayHdr header = new RayHdr();
			IntPtr ftrPtr = Marshal.AllocHGlobal(buffer.Length);
			Marshal.Copy(buffer, 0, ftrPtr, buffer.Length);
			header = (RayHdr)Marshal.PtrToStructure(ftrPtr, typeof(RayHdr));
			Marshal.FreeHGlobal(ftrPtr);

			string signature = StringHandlers.CToString(header.signature);

			Regex sx = new Regex(DimSignatureRegEx);
			Match sm = sx.Match(signature);

			if(!sm.Success)
				return false;

			ImageInfo.imageApplicationVersion = string.Format("{0}.{1}", sm.Groups["major"].Value, sm.Groups["minor"].Value);

			ImageInfo.cylinders = (uint)(header.cylinders + 1);
			ImageInfo.heads = (uint)(header.heads + 1);
			ImageInfo.sectorsPerTrack = header.sectorsPerTrack;
			ImageInfo.sectors = ImageInfo.cylinders * ImageInfo.heads * ImageInfo.sectorsPerTrack;
			ImageInfo.sectorSize = 512;

			byte[] sectors = new byte[ImageInfo.sectorsPerTrack * ImageInfo.sectorSize];
			disk = new MemoryStream();

			for(int i = 0; i < ImageInfo.sectorsPerTrack * ImageInfo.sectorSize; i++)
			{
				stream.Read(sectors, 0, sectors.Length);
				stream.Seek(ImageInfo.sectorsPerTrack, SeekOrigin.Current);
				disk.Write(sectors, 0, sectors.Length);
			}

			switch(header.diskType)
			{
				case RayDiskTypes.Md2hd:
					if(ImageInfo.heads == 2 && ImageInfo.cylinders == 80 && ImageInfo.sectorsPerTrack == 15)
						ImageInfo.mediaType = MediaType.DOS_525_HD;
					else
						goto case RayDiskTypes.Md2dd;
					break;
				case RayDiskTypes.Md2dd:
					if(ImageInfo.heads == 1 && ImageInfo.cylinders == 40 && ImageInfo.sectorsPerTrack == 8)
						ImageInfo.mediaType = MediaType.DOS_525_SS_DD_8;
					else if(ImageInfo.heads == 1 && ImageInfo.cylinders == 40 && ImageInfo.sectorsPerTrack == 9)
						ImageInfo.mediaType = MediaType.DOS_525_SS_DD_9;
					else if(ImageInfo.heads == 2 && ImageInfo.cylinders == 40 && ImageInfo.sectorsPerTrack == 8)
						ImageInfo.mediaType = MediaType.DOS_525_DS_DD_8;
					else if(ImageInfo.heads == 2 && ImageInfo.cylinders == 40 && ImageInfo.sectorsPerTrack == 9)
						ImageInfo.mediaType = MediaType.DOS_525_DS_DD_9;
					else
						ImageInfo.mediaType = MediaType.Unknown;
					break;
				case RayDiskTypes.Mf2ed:
					if(ImageInfo.heads == 2 && ImageInfo.cylinders == 80 && ImageInfo.sectorsPerTrack == 36)
						ImageInfo.mediaType = MediaType.DOS_35_ED;
					else
						goto case RayDiskTypes.Mf2hd;
					break;
				case RayDiskTypes.Mf2hd:
					if(ImageInfo.heads == 2 && ImageInfo.cylinders == 80 && ImageInfo.sectorsPerTrack == 18)
						ImageInfo.mediaType = MediaType.DOS_35_HD;
					else if(ImageInfo.heads == 2 && ImageInfo.cylinders == 80 && ImageInfo.sectorsPerTrack == 21)
						ImageInfo.mediaType = MediaType.DMF;
					else if(ImageInfo.heads == 2 && ImageInfo.cylinders == 82 && ImageInfo.sectorsPerTrack == 21)
						ImageInfo.mediaType = MediaType.DMF_82;
					else if(ImageInfo.heads == 2 && ImageInfo.cylinders == 80 && ImageInfo.sectorsPerTrack == 15)
						ImageInfo.mediaType = MediaType.NEC_35_HD_15;
					else
						goto case RayDiskTypes.Mf2dd;
					break;
				case RayDiskTypes.Mf2dd:
					if(ImageInfo.heads == 2 && ImageInfo.cylinders == 80 && ImageInfo.sectorsPerTrack == 9)
						ImageInfo.mediaType = MediaType.DOS_35_DS_DD_9;
					else if(ImageInfo.heads == 2 && ImageInfo.cylinders == 80 && ImageInfo.sectorsPerTrack == 8)
						ImageInfo.mediaType = MediaType.DOS_35_DS_DD_8;
					else if(ImageInfo.heads == 1 && ImageInfo.cylinders == 80 && ImageInfo.sectorsPerTrack == 9)
						ImageInfo.mediaType = MediaType.DOS_35_SS_DD_9;
					else if(ImageInfo.heads == 1 && ImageInfo.cylinders == 80 && ImageInfo.sectorsPerTrack == 8)
						ImageInfo.mediaType = MediaType.DOS_35_SS_DD_8;
					else if(ImageInfo.heads == 1 && ImageInfo.cylinders == 70 && ImageInfo.sectorsPerTrack == 9)
						ImageInfo.mediaType = MediaType.Apricot_35;
					else
						ImageInfo.mediaType = MediaType.Unknown;
					break;
				default:
					ImageInfo.mediaType = MediaType.Unknown;
					break;
			}

			ImageInfo.xmlMediaType = XmlMediaType.BlockMedia;

			return true;
		}

		public override bool? VerifySector(ulong sectorAddress)
		{
			return null;
		}

		public override bool? VerifySector(ulong sectorAddress, uint track)
		{
			return null;
		}

		public override bool? VerifySectors(ulong sectorAddress, uint length, out List<ulong> FailingLBAs, out List<ulong> UnknownLBAs)
		{
			FailingLBAs = new List<ulong>();
			UnknownLBAs = new List<ulong>();

			for(ulong i = sectorAddress; i < sectorAddress + length; i++)
				UnknownLBAs.Add(i);

			return null;
		}

		public override bool? VerifySectors(ulong sectorAddress, uint length, uint track, out List<ulong> FailingLBAs, out List<ulong> UnknownLBAs)
		{
			FailingLBAs = new List<ulong>();
			UnknownLBAs = new List<ulong>();

			for(ulong i = sectorAddress; i < sectorAddress + length; i++)
				UnknownLBAs.Add(i);

			return null;
		}

		public override bool? VerifyMediaImage()
		{
			return null;
		}

		public override bool ImageHasPartitions()
		{
			return ImageInfo.imageHasPartitions;
		}

		public override ulong GetImageSize()
		{
			return ImageInfo.imageSize;
		}

		public override ulong GetSectors()
		{
			return ImageInfo.sectors;
		}

		public override uint GetSectorSize()
		{
			return ImageInfo.sectorSize;
		}

		public override byte[] ReadSector(ulong sectorAddress)
		{
			return ReadSectors(sectorAddress, 1);
		}

		public override byte[] ReadSectorTag(ulong sectorAddress, SectorTagType tag)
		{
			throw new FeatureUnsupportedImageException("Feature not supported by image format");
		}

		public override byte[] ReadSectors(ulong sectorAddress, uint length)
		{
			if(sectorAddress > ImageInfo.sectors - 1)
				throw new ArgumentOutOfRangeException(nameof(sectorAddress), "Sector address not found");

			if(sectorAddress + length > ImageInfo.sectors)
				throw new ArgumentOutOfRangeException(nameof(length), "Requested more sectors than available");

			byte[] buffer = new byte[length * ImageInfo.sectorSize];

			disk.Seek((long)(sectorAddress * ImageInfo.sectorSize), SeekOrigin.Begin);
			disk.Read(buffer, 0, (int)(length * ImageInfo.sectorSize));

			return buffer;
		}

		public override byte[] ReadSectorsTag(ulong sectorAddress, uint length, SectorTagType tag)
		{
			throw new FeatureUnsupportedImageException("Feature not supported by image format");
		}

		public override byte[] ReadSectorLong(ulong sectorAddress)
		{
			throw new FeatureUnsupportedImageException("Feature not supported by image format");
		}

		public override byte[] ReadSectorsLong(ulong sectorAddress, uint length)
		{
			throw new FeatureUnsupportedImageException("Feature not supported by image format");
		}

		public override string GetImageFormat()
		{
			return "Ray Arachelian's Disk IMage";
		}

		public override string GetImageVersion()
		{
			return ImageInfo.imageVersion;
		}

		public override string GetImageApplication()
		{
			return ImageInfo.imageApplication;
		}

		public override string GetImageApplicationVersion()
		{
			return ImageInfo.imageApplicationVersion;
		}

		public override DateTime GetImageCreationTime()
		{
			return ImageInfo.imageCreationTime;
		}

		public override DateTime GetImageLastModificationTime()
		{
			return ImageInfo.imageLastModificationTime;
		}

		public override string GetImageName()
		{
			return ImageInfo.imageName;
		}

		public override MediaType GetMediaType()
		{
			return ImageInfo.mediaType;
		}

		#region Unsupported features

		public override byte[] ReadDiskTag(MediaTagType tag)
		{
			throw new FeatureUnsupportedImageException("Feature not supported by image format");
		}

		public override string GetImageCreator()
		{
			return ImageInfo.imageCreator;
		}

		public override string GetImageComments()
		{
			return ImageInfo.imageComments;
		}

		public override string GetMediaManufacturer()
		{
			return ImageInfo.mediaManufacturer;
		}

		public override string GetMediaModel()
		{
			return ImageInfo.mediaModel;
		}

		public override string GetMediaSerialNumber()
		{
			return ImageInfo.mediaSerialNumber;
		}

		public override string GetMediaBarcode()
		{
			return ImageInfo.mediaBarcode;
		}

		public override string GetMediaPartNumber()
		{
			return ImageInfo.mediaPartNumber;
		}

		public override int GetMediaSequence()
		{
			return ImageInfo.mediaSequence;
		}

		public override int GetLastDiskSequence()
		{
			return ImageInfo.lastMediaSequence;
		}

		public override string GetDriveManufacturer()
		{
			return ImageInfo.driveManufacturer;
		}

		public override string GetDriveModel()
		{
			return ImageInfo.driveModel;
		}

		public override string GetDriveSerialNumber()
		{
			return ImageInfo.driveSerialNumber;
		}

		public override List<Partition> GetPartitions()
		{
			throw new FeatureUnsupportedImageException("Feature not supported by image format");
		}

		public override List<Track> GetTracks()
		{
			throw new FeatureUnsupportedImageException("Feature not supported by image format");
		}

		public override List<Track> GetSessionTracks(Session session)
		{
			throw new FeatureUnsupportedImageException("Feature not supported by image format");
		}

		public override List<Track> GetSessionTracks(ushort session)
		{
			throw new FeatureUnsupportedImageException("Feature not supported by image format");
		}

		public override List<Session> GetSessions()
		{
			throw new FeatureUnsupportedImageException("Feature not supported by image format");
		}

		public override byte[] ReadSector(ulong sectorAddress, uint track)
		{
			throw new FeatureUnsupportedImageException("Feature not supported by image format");
		}

		public override byte[] ReadSectorTag(ulong sectorAddress, uint track, SectorTagType tag)
		{
			throw new FeatureUnsupportedImageException("Feature not supported by image format");
		}

		public override byte[] ReadSectors(ulong sectorAddress, uint length, uint track)
		{
			throw new FeatureUnsupportedImageException("Feature not supported by image format");
		}

		public override byte[] ReadSectorsTag(ulong sectorAddress, uint length, uint track, SectorTagType tag)
		{
			throw new FeatureUnsupportedImageException("Feature not supported by image format");
		}

		public override byte[] ReadSectorLong(ulong sectorAddress, uint track)
		{
			throw new FeatureUnsupportedImageException("Feature not supported by image format");
		}

		public override byte[] ReadSectorsLong(ulong sectorAddress, uint length, uint track)
		{
			throw new FeatureUnsupportedImageException("Feature not supported by image format");
		}

		#endregion Unsupported features
	}
}