// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// Filename       : 06.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Device structures decoders.
//
// --[ Description ] ----------------------------------------------------------
//
//     Decodes SCSI MODE PAGE 06h: Optical memory 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 Mode Page 0x06: Optical memory page
    /// <summary>
    /// Optical memory page
    /// Page code 0x06
    /// 4 bytes in SCSI-2
    /// </summary>
    public struct ModePage_06
    {
        /// <summary>
        /// Parameters can be saved
        /// </summary>
        public bool PS;
        /// <summary>
        /// Report updated block read
        /// </summary>
        public bool RUBR;
    }

    public static ModePage_06? DecodeModePage_06(byte[] pageResponse)
    {
        if((pageResponse?[0] & 0x40) == 0x40) return null;

        if((pageResponse?[0] & 0x3F) != 0x06) return null;

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

        if(pageResponse.Length < 4) return null;

        ModePage_06 decoded = new ModePage_06();

        decoded.PS |= (pageResponse[0] & 0x80) == 0x80;
        decoded.RUBR |= (pageResponse[2] & 0x01) == 0x01;

        return decoded;
    }

    public static string PrettifyModePage_06(byte[] pageResponse)
    {
        return PrettifyModePage_06(DecodeModePage_06(pageResponse));
    }

    public static string PrettifyModePage_06(ModePage_06? modePage)
    {
        if(!modePage.HasValue) return null;

        ModePage_06 page = modePage.Value;
        StringBuilder sb = new StringBuilder();

        sb.AppendLine("SCSI optical memory:");

        if(page.PS) sb.AppendLine("\tParameters can be saved");
        if(page.RUBR) sb.AppendLine("\tOn reading an updated block drive will return RECOVERED ERROR");

        return sb.ToString();
    }
    #endregion Mode Page 0x06: Optical memory page
    }
}