/*  Copyright (C) 2008-2016 Peter Palotas, Jeffrey Jangli, Alexandr Normuradov
 *  
 *  Permission is hereby granted, free of charge, to any person obtaining a copy 
 *  of this software and associated documentation files (the "Software"), to deal 
 *  in the Software without restriction, including without limitation the rights 
 *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 
 *  copies of the Software, and to permit persons to whom the Software is 
 *  furnished to do so, subject to the following conditions:
 *  
 *  The above copyright notice and this permission notice shall be included in 
 *  all copies or substantial portions of the Software.
 *  
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
 *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
 *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
 *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
 *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 
 *  THE SOFTWARE. 
 */

using System;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.InteropServices;
namespace Alphaleonis.Win32.Filesystem
{
   internal static partial class NativeMethods
   {
      /// <summary>Represents the number of 100-nanosecond intervals since January 1, 1601. This structure is a 64-bit value.</summary>
      [SerializableAttribute]
      [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
      internal struct FILETIME
      {         
         #region Fields

         private readonly uint dwLowDateTime;
         private readonly uint dwHighDateTime;

         #endregion // Fields

         #region Methods

         /// <summary>Converts a value to long.</summary>
         public static implicit operator long(FILETIME ft)
         {
            return ft.ToLong();
         }

         /// <summary>Converts a value to long.</summary>
         [SuppressMessage("Microsoft.Naming", "CA1720:IdentifiersShouldNotContainTypeNames", MessageId = "long")]
         public long ToLong()
         {
            return NativeMethods.ToLong(dwHighDateTime, dwLowDateTime);
         }

         #endregion

         #region Equality

         #region Equals

         /// <summary>Determines whether the specified Object is equal to the current Object.</summary>
         /// <param name="obj">Another object to compare to.</param>
         /// <returns><see langword="true"/> if the specified Object is equal to the current Object; otherwise, <see langword="false"/>.</returns>
         public override bool Equals(object obj)
         {
            if (obj == null || GetType() != obj.GetType())
               return false;

            FILETIME other = obj is FILETIME ? (FILETIME)obj : new FILETIME();

            return (other.dwHighDateTime.Equals(dwHighDateTime) &&
                    other.dwLowDateTime.Equals(dwLowDateTime));
         }

         #endregion // Equals

         #region GetHashCode

         /// <summary>Serves as a hash function for a particular type.</summary>
         /// <returns>A hash code for the current Object.</returns>
         public override int GetHashCode()
         {
            unchecked
            {
               int hash = 17;
               hash = hash * 23 + dwHighDateTime.GetHashCode();
               hash = hash * 11 + dwLowDateTime.GetHashCode();
               return hash;
            }
         }

         #endregion // GetHashCode

         #region ==

         /// <summary>Implements the operator ==</summary>
         /// <param name="left">A.</param>
         /// <param name="right">B.</param>
         /// <returns>The result of the operator.</returns>
         public static bool operator ==(FILETIME left, FILETIME right)
         {
            return left.Equals(right);
         }
         
         #endregion // ==

         #region !=
         /// <summary>Implements the operator !=</summary>
         /// <param name="left">A.</param>
         /// <param name="right">B.</param>
         /// <returns>The result of the operator.</returns>
         public static bool operator !=(FILETIME left, FILETIME right)
         {
            return !(left == right);
         }

         #endregion // !=

         #endregion // Equality
      }
   }
}
