/* Copyright (C) 2017 Tal Aloni <tal.aloni.il@gmail.com>. All rights reserved.
 * 
 * You can redistribute this program and/or modify it under the terms of
 * the GNU Lesser Public License as published by the Free Software Foundation,
 * either version 3 of the License, or (at your option) any later version.
 */
using System;
using System.Collections.Generic;
using Utilities;

namespace SMBLibrary.SMB2
{
    /// <summary>
    /// SMB2 SET_INFO Request
    /// </summary>
    public class SetInfoRequest : SMB2Command
    {
        public const int FixedSize = 32;
        public const int DeclaredSize = 33;

        public ushort StructureSize;
        public InfoType InfoType;
        private byte FileInfoClass;
        public uint BufferLength;
        private ushort BufferOffset;
        public ushort Reserved;
        public uint AdditionalInformation;
        public FileID FileId;
        public byte[] Buffer = new byte[0];

        public SetInfoRequest() : base(SMB2CommandName.SetInfo)
        {
            StructureSize = DeclaredSize;
        }

        public SetInfoRequest(byte[] buffer, int offset) : base(buffer, offset)
        {
            StructureSize = LittleEndianConverter.ToUInt16(buffer, offset + SMB2Header.Length + 0);
            InfoType = (InfoType)ByteReader.ReadByte(buffer, offset + SMB2Header.Length + 2);
            FileInfoClass = ByteReader.ReadByte(buffer, offset + SMB2Header.Length + 3);
            BufferLength = LittleEndianConverter.ToUInt32(buffer, offset + SMB2Header.Length + 4);
            BufferOffset = LittleEndianConverter.ToUInt16(buffer, offset + SMB2Header.Length + 8);
            Reserved = LittleEndianConverter.ToUInt16(buffer, offset + SMB2Header.Length + 10);
            AdditionalInformation = LittleEndianConverter.ToUInt32(buffer, offset + SMB2Header.Length + 12);
            FileId = new FileID(buffer, offset + SMB2Header.Length + 16);
            Buffer = ByteReader.ReadBytes(buffer, offset + BufferOffset, (int)BufferLength);
        }

        public override void WriteCommandBytes(byte[] buffer, int offset)
        {
            BufferOffset = 0;
            BufferLength = (uint)Buffer.Length;
            if (Buffer.Length > 0)
            {
                BufferOffset = SMB2Header.Length + FixedSize;
            }
            LittleEndianWriter.WriteUInt16(buffer, offset + 0, StructureSize);
            ByteWriter.WriteByte(buffer, offset + 2, (byte)InfoType);
            ByteWriter.WriteByte(buffer, offset + 3, FileInfoClass);
            LittleEndianWriter.WriteUInt32(buffer, offset + 4, BufferLength);
            LittleEndianWriter.WriteUInt16(buffer, offset + 8, BufferOffset);
            LittleEndianWriter.WriteUInt16(buffer, offset + 10, Reserved);
            LittleEndianWriter.WriteUInt32(buffer, offset + 12, AdditionalInformation);
            FileId.WriteBytes(buffer, offset + 16);
            ByteWriter.WriteBytes(buffer, offset + FixedSize, Buffer);
        }

        public FileInformationClass FileInformationClass
        {
            get
            {
                return (FileInformationClass)FileInfoClass;
            }
            set
            {
                FileInfoClass = (byte)value;
            }
        }

        public FileSystemInformationClass FileSystemInformationClass
        {
            get
            {
                return (FileSystemInformationClass)FileInfoClass;
            }
            set
            {
                FileInfoClass = (byte)value;
            }
        }

        public void SetFileInformation(FileInformation fileInformation)
        {
            Buffer = fileInformation.GetBytes();
        }

        public override int CommandLength
        {
            get
            {
                return FixedSize + Buffer.Length;
            }
        }
    }
}