// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// Filename       : Super.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Apple DOS filesystem plugin.
//
// --[ Description ] ----------------------------------------------------------
//
//     Handles mounting and umounting the Apple DOS filesystem.
//
// --[ 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;
using System.Runtime.InteropServices;
using Claunia.Encoding;
using DiscImageChef.CommonTypes;
using DiscImageChef.Console;
using DiscImageChef.DiscImages;
using Schemas;
using Encoding = System.Text.Encoding;

namespace DiscImageChef.Filesystems.AppleDOS
{
    public partial class AppleDOS
    {
        /// <summary>
        ///     Mounts an Apple DOS filesystem
        /// </summary>
        public virtual Errno Mount(IMediaImage imagePlugin, Partition partition, Encoding encoding, bool debug)
        {
            device = imagePlugin;
            start = partition.Start;
            // TODO: Until Apple ][ encoding is implemented
            currentEncoding = new LisaRoman();
            
            if(device.Info.Sectors != 455 && device.Info.Sectors != 560)
            {
                DicConsole.DebugWriteLine("Apple DOS plugin", "Incorrect device size.");
                return Errno.InOutError;
            }

            if(start > 0)
            {
                DicConsole.DebugWriteLine("Apple DOS plugin", "Partitions are not supported.");
                return Errno.InOutError;
            }

            if(device.Info.SectorSize != 256)
            {
                DicConsole.DebugWriteLine("Apple DOS plugin", "Incorrect sector size.");
                return Errno.InOutError;
            }

            sectorsPerTrack = device.Info.Sectors == 455 ? 13 : 16;

            // Read the VTOC
            vtocBlocks = device.ReadSector((ulong)(17 * sectorsPerTrack));
            vtoc = new Vtoc();
            IntPtr vtocPtr = Marshal.AllocHGlobal(256);
            Marshal.Copy(vtocBlocks, 0, vtocPtr, 256);
            vtoc = (Vtoc)Marshal.PtrToStructure(vtocPtr, typeof(Vtoc));
            Marshal.FreeHGlobal(vtocPtr);

            track1UsedByFiles = false;
            track2UsedByFiles = false;
            usedSectors = 1;

            Errno error = ReadCatalog();
            if(error != Errno.NoError)
            {
                DicConsole.DebugWriteLine("Apple DOS plugin", "Unable to read catalog.");
                return error;
            }

            error = CacheAllFiles();
            if(error != Errno.NoError)
            {
                DicConsole.DebugWriteLine("Apple DOS plugin", "Unable cache all files.");
                return error;
            }

            // Create XML metadata for mounted filesystem
            xmlFsType = new FileSystemType
            {
                Bootable = true,
                Clusters = (long)device.Info.Sectors,
                ClusterSize = vtoc.bytesPerSector,
                Files = catalogCache.Count,
                FilesSpecified = true,
                FreeClustersSpecified = true,
                Type = "Apple DOS"
            };
            xmlFsType.FreeClusters = xmlFsType.Clusters - usedSectors;

            this.debug = debug;
            mounted = true;
            return Errno.NoError;
        }

        /// <summary>
        ///     Umounts this DOS filesystem
        /// </summary>
        public virtual Errno Unmount()
        {
            mounted = false;
            extentCache = null;
            fileCache = null;
            catalogCache = null;
            fileSizeCache = null;

            return Errno.NoError;
        }

        /// <summary>
        ///     Gets information about the mounted volume.
        /// </summary>
        /// <param name="stat">Information about the mounted volume.</param>
        public virtual Errno StatFs(ref FileSystemInfo stat)
        {
            stat = new FileSystemInfo
            {
                Blocks = (long)device.Info.Sectors,
                FilenameLength = 30,
                Files = (ulong)catalogCache.Count,
                PluginId = Id,
                Type = "Apple DOS"
            };
            stat.FreeFiles = totalFileEntries - stat.Files;
            stat.FreeBlocks = stat.Blocks - usedSectors;

            return Errno.NoError;
        }
    }
}