// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// Filename       : Spare.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Device structures decoders.
//
// --[ Description ] ----------------------------------------------------------
//
//     Decodes Blu-ray Spare Area Information.
//
// --[ 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 © 2011-2019 Natalia Portillo
// ****************************************************************************/

using System;
using System.Diagnostics.CodeAnalysis;
using System.Text;
using DiscImageChef.Console;

namespace DiscImageChef.Decoders.Bluray
{
    /// <summary>
    ///     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
    /// </summary>
    [SuppressMessage("ReSharper", "InconsistentNaming")]
    [SuppressMessage("ReSharper", "MemberCanBeInternal")]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    [SuppressMessage("ReSharper", "NotAccessedField.Global")]
    public static class Spare
    {
        #region Public methods
        public static SpareAreaInformation? Decode(byte[] SAIResponse)
        {
            if(SAIResponse == null) return null;

            if(SAIResponse.Length != 16)
            {
                DicConsole.DebugWriteLine("BD Spare Area Information decoder",
                                          "Found incorrect Blu-ray Spare Area Information size ({0} bytes)",
                                          SAIResponse.Length);
                return null;
            }

            SpareAreaInformation decoded = new SpareAreaInformation();

            BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;

            decoded.DataLength           = BigEndianBitConverter.ToUInt16(SAIResponse, 0);
            decoded.Reserved1            = SAIResponse[2];
            decoded.Reserved2            = SAIResponse[3];
            decoded.Reserved3            = BigEndianBitConverter.ToUInt32(SAIResponse, 4);
            decoded.FreeSpareBlocks      = BigEndianBitConverter.ToUInt32(SAIResponse, 8);
            decoded.AllocatedSpareBlocks = BigEndianBitConverter.ToUInt32(SAIResponse, 12);

            return decoded;
        }

        public static string Prettify(SpareAreaInformation? SAIResponse)
        {
            if(SAIResponse == null) return null;

            SpareAreaInformation response = SAIResponse.Value;

            StringBuilder sb = new StringBuilder();

            #if DEBUG
            if(response.Reserved1 != 0) sb.AppendFormat("Reserved1 = 0x{0:X2}", response.Reserved1).AppendLine();
            if(response.Reserved2 != 0) sb.AppendFormat("Reserved2 = 0x{0:X2}", response.Reserved2).AppendLine();
            if(response.Reserved3 != 0) sb.AppendFormat("Reserved3 = 0x{0:X8}", response.Reserved3).AppendLine();
            #endif
            sb.AppendFormat("{0} free spare blocks", response.FreeSpareBlocks).AppendLine();
            sb.AppendFormat("{0} allocated spare blocks", response.AllocatedSpareBlocks).AppendLine();

            return sb.ToString();
        }

        public static string Prettify(byte[] SAIResponse) => Prettify(Decode(SAIResponse));
        #endregion Public methods

        #region Public structures
        public struct SpareAreaInformation
        {
            /// <summary>
            ///     Bytes 0 to 1
            ///     Always 14
            /// </summary>
            public ushort DataLength;
            /// <summary>
            ///     Byte 2
            ///     Reserved
            /// </summary>
            public byte Reserved1;
            /// <summary>
            ///     Byte 3
            ///     Reserved
            /// </summary>
            public byte Reserved2;
            /// <summary>
            ///     Bytes 4 to 7
            ///     Reserved
            /// </summary>
            public uint Reserved3;
            /// <summary>
            ///     Bytes 8 to 11
            ///     Free spare blocks
            /// </summary>
            public uint FreeSpareBlocks;
            /// <summary>
            ///     Bytes 12 to 15
            ///     Allocated spare blocks
            /// </summary>
            public uint AllocatedSpareBlocks;
        }
        #endregion Public structures
    }
}