// /***************************************************************************
// Aaru Data Preservation Suite
// ----------------------------------------------------------------------------
//
// Filename       : MHDDLog.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Core algorithms.
//
// --[ Description ] ----------------------------------------------------------
//
//     Glue logic to create a binary media scan log in MHDD's format.
//
// --[ License ] --------------------------------------------------------------
//
//     This program is free software: you can redistribute it and/or modify
//     it under the terms of the GNU General Public License as
//     published by the Free Software Foundation, either version 3 of the
//     License, or (at your option) any later version.
//
//     This program 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 General Public License for more details.
//
//     You should have received a copy of the GNU General Public License
//     along with this program.  If not, see <http://www.gnu.org/licenses/>.
//
// ----------------------------------------------------------------------------
// Copyright © 2011-2022 Natalia Portillo
// ****************************************************************************/

namespace Aaru.Core.Logging;

using System;
using System.Globalization;
using System.IO;
using System.Text;
using Aaru.CommonTypes.Enums;
using Aaru.Devices;

/// <summary>Implements a log in the format used by MHDD</summary>
sealed class MhddLog
{
    const    string       MHDD_VER = "VER:2 ";
    readonly string       _logFile;
    readonly MemoryStream _mhddFs;

    /// <summary>Initializes the MHDD log</summary>
    /// <param name="outputFile">Log file</param>
    /// <param name="dev">Device</param>
    /// <param name="blocks">Blocks in media</param>
    /// <param name="blockSize">Bytes per block</param>
    /// <param name="blocksToRead">How many blocks read at once</param>
    /// <param name="private">Disable saving paths or serial numbers in log</param>
    internal MhddLog(string outputFile, Device dev, ulong blocks, ulong blockSize, ulong blocksToRead, bool @private)
    {
        if(dev == null ||
           string.IsNullOrEmpty(outputFile))
            return;

        _mhddFs  = new MemoryStream();
        _logFile = outputFile;

        string mode;

        switch(dev.Type)
        {
            case DeviceType.ATA:
            case DeviceType.ATAPI:
                mode = "MODE: IDE";

                break;
            case DeviceType.SCSI:
                mode = "MODE: SCSI";

                break;
            case DeviceType.MMC:
                mode = "MODE: MMC";

                break;
            case DeviceType.NVMe:
                mode = "MODE: NVMe";

                break;
            case DeviceType.SecureDigital:
                mode = "MODE: SD";

                break;
            default:
                mode = "MODE: IDE";

                break;
        }

        var device     = $"DEVICE: {dev.Manufacturer} {dev.Model}";
        var fw         = $"F/W: {dev.FirmwareRevision}";
        var sn         = $"S/N: {(@private ? "" : dev.Serial)}";
        var sectors    = string.Format(new CultureInfo("en-US"), "SECTORS: {0:n0}", blocks);
        var sectorSize = string.Format(new CultureInfo("en-US"), "SECTOR SIZE: {0:n0} bytes", blockSize);

        var scanBlockSize = string.Format(new CultureInfo("en-US"), "SCAN BLOCK SIZE: {0:n0} sectors", blocksToRead);

        byte[] deviceBytes        = Encoding.ASCII.GetBytes(device);
        byte[] modeBytes          = Encoding.ASCII.GetBytes(mode);
        byte[] fwBytes            = Encoding.ASCII.GetBytes(fw);
        byte[] snBytes            = Encoding.ASCII.GetBytes(sn);
        byte[] sectorsBytes       = Encoding.ASCII.GetBytes(sectors);
        byte[] sectorSizeBytes    = Encoding.ASCII.GetBytes(sectorSize);
        byte[] scanBlockSizeBytes = Encoding.ASCII.GetBytes(scanBlockSize);
        byte[] verBytes           = Encoding.ASCII.GetBytes(MHDD_VER);

        var pointer = (uint)(deviceBytes.Length  + modeBytes.Length       + fwBytes.Length            + snBytes.Length +
                             sectorsBytes.Length + sectorSizeBytes.Length + scanBlockSizeBytes.Length +
                             verBytes.Length     + 2 * 9                  + // New lines
                             4);                                            // Pointer

        var newLine = new byte[2];
        newLine[0] = 0x0D;
        newLine[1] = 0x0A;

        _mhddFs.Write(BitConverter.GetBytes(pointer), 0, 4);
        _mhddFs.Write(newLine, 0, 2);
        _mhddFs.Write(verBytes, 0, verBytes.Length);
        _mhddFs.Write(newLine, 0, 2);
        _mhddFs.Write(modeBytes, 0, modeBytes.Length);
        _mhddFs.Write(newLine, 0, 2);
        _mhddFs.Write(deviceBytes, 0, deviceBytes.Length);
        _mhddFs.Write(newLine, 0, 2);
        _mhddFs.Write(fwBytes, 0, fwBytes.Length);
        _mhddFs.Write(newLine, 0, 2);
        _mhddFs.Write(snBytes, 0, snBytes.Length);
        _mhddFs.Write(newLine, 0, 2);
        _mhddFs.Write(sectorsBytes, 0, sectorsBytes.Length);
        _mhddFs.Write(newLine, 0, 2);
        _mhddFs.Write(sectorSizeBytes, 0, sectorSizeBytes.Length);
        _mhddFs.Write(newLine, 0, 2);
        _mhddFs.Write(scanBlockSizeBytes, 0, scanBlockSizeBytes.Length);
        _mhddFs.Write(newLine, 0, 2);
    }

    /// <summary>Logs a new read</summary>
    /// <param name="sector">Starting sector</param>
    /// <param name="duration">Duration in milliseconds</param>
    internal void Write(ulong sector, double duration)
    {
        if(_logFile == null)
            return;

        byte[] sectorBytes   = BitConverter.GetBytes(sector);
        byte[] durationBytes = BitConverter.GetBytes((ulong)(duration * 1000));

        _mhddFs.Write(sectorBytes, 0, 8);
        _mhddFs.Write(durationBytes, 0, 8);
    }

    /// <summary>Closes and writes to file the MHDD log</summary>
    internal void Close()
    {
        if(_logFile == null)
            return;

        var fs = new FileStream(_logFile, FileMode.Create);
        _mhddFs.WriteTo(fs);
        _mhddFs.Close();
        fs.Close();
    }
}