using System;
using System.Runtime.InteropServices;

namespace Developpez.Dotnet.System
{
    /// <summary>
    /// Représente une opération de déplacement de fichier qui peut signaler
    /// sa progression.
    /// </summary>
    public class FileMoveOperation : FileOperationBase
    {
        /// <summary>
        /// Initialise une nouvelle instance de FileMoveOperation
        /// </summary>
        /// <param name="source">Fichier source</param>
        /// <param name="destination">Fichier destination</param>
        public FileMoveOperation(string source, string destination)
            : base(source, destination)
        {
        }

        /// <summary>
        /// Exécute le déplacement
        /// </summary>
        protected override void ExecuteCore()
        {
            var flags = MoveFileFlags.CopyAllowed;
            if (ReplaceExisting)
                flags |= MoveFileFlags.ReplaceExisting;

            bool r = MoveFileWithProgress(
                Source,
                Destination,
                ProgressCallback,
                IntPtr.Zero,
                flags);

            CheckError(r);
        }

        /// <summary>
        /// Renvoie FileOperationType.Move
        /// </summary>
        public override FileOperationType OperationType
        {
            get { return FileOperationType.Move; }
        }

        #region Interop declarations

        [DllImport("kernel32", SetLastError = true)]
        private static extern bool MoveFileWithProgress(
            string lpExistingFileName,
            string lpNewFileName,
            CopyProgressRoutine lpProgressRoutine,
            IntPtr lpData,
            MoveFileFlags dwFlags);

        [Flags]
        private enum MoveFileFlags
        {
            // ReSharper disable UnusedMember.Local
            ReplaceExisting = 0x01,
            CopyAllowed = 0x02,
            DelayUntilReboot = 0x04,
            WriteThrough = 0x08,
            CreateHardLink = 0x10,
            FailIfNotTrackable = 0x20
            // ReSharper restore UnusedMember.Local
        }

        #endregion
    }
}