// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// Filename       : 24_IBM.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Device structures decoders.
//
// --[ Description ] ----------------------------------------------------------
//
//     Decodes IBM MODE PAGE 24h: Drive Capabilities Control 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 © 2011-2018 Natalia Portillo
// ****************************************************************************/

using System.Text;

namespace DiscImageChef.Decoders.SCSI
{
    public static partial class Modes
    {
        #region IBM Mode Page 0x24: Drive Capabilities Control Mode page
        public struct IBM_ModePage_24
        {
            /// <summary>
            /// Parameters can be saved
            /// </summary>
            public bool PS;
            public byte ModeControl;
            public byte VelocitySetting;
            public bool EncryptionEnabled;
            public bool EncryptionCapable;
        }

        public static IBM_ModePage_24? DecodeIBMModePage_24(byte[] pageResponse)
        {
            if((pageResponse?[0] & 0x40) == 0x40) return null;

            if((pageResponse?[0] & 0x3F) != 0x24) return null;

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

            if(pageResponse.Length != 8) return null;

            IBM_ModePage_24 decoded = new IBM_ModePage_24();

            decoded.PS |= (pageResponse[0] & 0x80) == 0x80;
            decoded.ModeControl = pageResponse[2];
            decoded.VelocitySetting = pageResponse[3];
            decoded.EncryptionEnabled |= (pageResponse[7] & 0x08) == 0x08;
            decoded.EncryptionCapable |= (pageResponse[7] & 0x01) == 0x01;

            return decoded;
        }

        public static string PrettifyIBMModePage_24(byte[] pageResponse)
        {
            return PrettifyIBMModePage_24(DecodeIBMModePage_24(pageResponse));
        }

        public static string PrettifyIBMModePage_24(IBM_ModePage_24? modePage)
        {
            if(!modePage.HasValue) return null;

            IBM_ModePage_24 page = modePage.Value;
            StringBuilder sb = new StringBuilder();

            sb.AppendLine("IBM Vendor-Specific Control Mode Page:");

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

            sb.AppendFormat("\tVendor-specific mode control: {0}", page.ModeControl);
            sb.AppendFormat("\tVendor-specific velocity setting: {0}", page.VelocitySetting);

            if(!page.EncryptionCapable) return sb.ToString();

            sb.AppendLine("\tDrive supports encryption");
            if(page.EncryptionEnabled) sb.AppendLine("\tDrive has encryption enabled");

            return sb.ToString();
        }
        #endregion IBM Mode Page 0x24: Drive Capabilities Control Mode page
    }
}