// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// Filename       : 2F_IBM.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Device structures decoders.
//
// --[ Description ] ----------------------------------------------------------
//
//     Decodes IBM MODE PAGE 2Fh: Behaviour Configuration Mode page.
//
// --[ 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.Diagnostics.CodeAnalysis;
using System.Text;

namespace DiscImageChef.Decoders.SCSI
{
    [SuppressMessage("ReSharper", "InconsistentNaming")]
    [SuppressMessage("ReSharper", "MemberCanBeInternal")]
    [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
    [SuppressMessage("ReSharper", "UnassignedField.Global")]
    public static partial class Modes
    {
        #region IBM Mode Page 0x2F: Behaviour Configuration Mode page
        public struct IBM_ModePage_2F
        {
            /// <summary>
            ///     Parameters can be saved
            /// </summary>
            public bool PS;
            public byte FenceBehaviour;
            public byte CleanBehaviour;
            public byte WORMEmulation;
            public byte SenseDataBehaviour;
            public bool CCDM;
            public bool DDEOR;
            public bool CLNCHK;
            public byte FirmwareUpdateBehaviour;
            public byte UOE_D;
            public byte UOE_F;
            public byte UOE_C;
        }

        public static IBM_ModePage_2F? DecodeIBMModePage_2F(byte[] pageResponse)
        {
            if((pageResponse?[0] & 0x40) == 0x40) return null;

            if((pageResponse?[0] & 0x3F) != 0x2F) return null;

            if(pageResponse[1] + 2 != pageResponse.Length) return null;

            if(pageResponse.Length < 8) return null;

            return new IBM_ModePage_2F
            {
                PS                      = (pageResponse[0] & 0x80) == 0x80,
                FenceBehaviour          = pageResponse[2],
                CleanBehaviour          = pageResponse[3],
                WORMEmulation           = pageResponse[4],
                SenseDataBehaviour      = pageResponse[5],
                CCDM                    = (pageResponse[6] & 0x04) == 0x04,
                DDEOR                   = (pageResponse[6] & 0x02) == 0x02,
                CLNCHK                  = (pageResponse[6] & 0x01) == 0x01,
                FirmwareUpdateBehaviour = pageResponse[7],
                UOE_C                   = (byte)((pageResponse[8] & 0x30) >> 4),
                UOE_F                   = (byte)((pageResponse[8] & 0x0C) >> 2)
            };
        }

        public static string PrettifyIBMModePage_2F(byte[] pageResponse) =>
            PrettifyIBMModePage_2F(DecodeIBMModePage_2F(pageResponse));

        public static string PrettifyIBMModePage_2F(IBM_ModePage_2F? modePage)
        {
            if(!modePage.HasValue) return null;

            IBM_ModePage_2F page = modePage.Value;
            StringBuilder   sb   = new StringBuilder();

            sb.AppendLine("IBM Behaviour Configuration Mode Page:");

            if(page.PS) sb.AppendLine("\tParameters can be saved");

            switch(page.FenceBehaviour)
            {
                case 0:
                    sb.AppendLine("\tFence behaviour is normal");
                    break;
                case 1:
                    sb.AppendLine("\tPanic fence behaviour is enabled");
                    break;
                default:
                    sb.AppendFormat("\tUnknown fence behaviour code {0}", page.FenceBehaviour).AppendLine();
                    break;
            }

            switch(page.CleanBehaviour)
            {
                case 0:
                    sb.AppendLine("\tCleaning behaviour is normal");
                    break;
                case 1:
                    sb.AppendLine("\tDrive will periodically request cleaning");
                    break;
                default:
                    sb.AppendFormat("\tUnknown cleaning behaviour code {0}", page.CleanBehaviour).AppendLine();
                    break;
            }

            switch(page.WORMEmulation)
            {
                case 0:
                    sb.AppendLine("\tWORM emulation is disabled");
                    break;
                case 1:
                    sb.AppendLine("\tWORM emulation is enabled");
                    break;
                default:
                    sb.AppendFormat("\tUnknown WORM emulation code {0}", page.WORMEmulation).AppendLine();
                    break;
            }

            switch(page.SenseDataBehaviour)
            {
                case 0:
                    sb.AppendLine("\tUses 35-bytes sense data");
                    break;
                case 1:
                    sb.AppendLine("\tUses 96-bytes sense data");
                    break;
                default:
                    sb.AppendFormat("\tUnknown sense data behaviour code {0}", page.WORMEmulation).AppendLine();
                    break;
            }

            if(page.CLNCHK) sb.AppendLine("\tDrive will set Check Condition when cleaning is needed");
            if(page.DDEOR) sb.AppendLine("\tNo deferred error will be reported to a rewind command");
            if(page.CCDM) sb.AppendLine("\tDrive will set Check Condition when the criteria for Dead Media is met");
            if(page.FirmwareUpdateBehaviour > 0)
                sb.AppendLine("\tDrive will not accept downlevel firmware via an FMR tape");

            if(page.UOE_C == 1) sb.AppendLine("\tDrive will eject cleaning cartridges on error");
            if(page.UOE_F == 1) sb.AppendLine("\tDrive will eject firmware cartridges on error");
            if(page.UOE_D == 1) sb.AppendLine("\tDrive will eject data cartridges on error");

            return sb.ToString();
        }
        #endregion IBM Mode Page 0x2F: Behaviour Configuration Mode page
    }
}