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 *     following disclaimer. 
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 *     following disclaimer in the documentation and/or other 
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using System;
using System.Collections.Generic;
using System.Linq;
using XenAdmin.Actions;
using XenAdmin.Network;
using XenAdmin.Commands;
using XenAdmin.Controls;
using XenAdmin.Core;
using XenAPI;

namespace XenAdmin.Dialogs
{
    public partial class MoveVirtualDiskDialog : XenDialogBase
    {
        protected const int BATCH_SIZE = 3;

        protected readonly List<VDI> _vdis= new List<VDI>();

        /// <summary>
        /// Designer support only. Do not use.
        /// </summary>
        public MoveVirtualDiskDialog()
        {
            InitializeComponent();
        }

        public MoveVirtualDiskDialog(IXenConnection connection, List<VDI> vdis)
            : base(connection)
        {
            InitializeComponent();
            _vdis = vdis ?? new List<VDI>();
        }

        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);
            
            UpdateButtons();
            srPicker1.PopulateAsync(SrPickerType, connection, null, null, _vdis.ToArray());
        }

        internal override string HelpName => "VDIMigrateDialog";

        protected SR SelectedSR => srPicker1.SR;

        protected virtual SrPicker.SRPickerType SrPickerType => SrPicker.SRPickerType.MoveOrCopy;

        private void UpdateButtons()
        {
            buttonMove.Enabled = srPicker1.SR != null;
        }

        #region Control event handlers

        private void srPicker1_SelectedIndexChanged(object sender, EventArgs e)
        {
            UpdateButtons();
        }

        private void srPicker1_DoubleClickOnRow(object sender, EventArgs e)
        {
            if (buttonMove.Enabled)
                buttonMove.PerformClick();
        }

        private void buttonMove_Click(object sender, EventArgs e)
        {
            CreateAndRunParallelActions();
            Close();
        }

        private void buttonCancel_Click(object sender, EventArgs e)
        {
            Close();
        }

        #endregion

        protected virtual void CreateAndRunParallelActions()
        {
            if (_vdis.Count == 1)
            {
                new MoveVirtualDiskAction(connection, _vdis[0], SelectedSR).RunAsync();
            }
            else if (_vdis.Count > 1)
            {
                string title = string.Format(Messages.ACTION_MOVING_X_VDIS, _vdis.Count, SelectedSR.name_label);

                var batch = from VDI vdi in _vdis
                    select (AsyncAction)new MoveVirtualDiskAction(connection, vdi, SelectedSR);

                new ParallelAction(connection, title, Messages.ACTION_MOVING_X_VDIS_STARTED,
                    Messages.ACTION_MOVING_X_VDIS_COMPLETED, batch.ToList(), BATCH_SIZE).RunAsync();
            }
        }

        internal static Command MoveMigrateCommand(IMainWindow mainWindow, SelectedItemCollection selection)
        {
            var cmd = new MigrateVirtualDiskCommand(mainWindow, selection);
            var con = selection.GetConnectionOfFirstItem();

            if (cmd.CanExecute() && !Helpers.FeatureForbidden(con, Host.RestrictCrossPoolMigrate))
                return cmd;

            return new MoveVirtualDiskCommand(mainWindow, selection);
        }
    }


    public class MigrateVirtualDiskDialog : MoveVirtualDiskDialog
    {
        public MigrateVirtualDiskDialog(IXenConnection connection, List<VDI> vdis)
            : base(connection, vdis)
        {
        }

        protected override SrPicker.SRPickerType SrPickerType => SrPicker.SRPickerType.Migrate;

        protected override void CreateAndRunParallelActions()
        {
            if (_vdis.Count == 1)
            {
                new MigrateVirtualDiskAction(connection, _vdis[0], SelectedSR).RunAsync();
            }
            else if (_vdis.Count > 1)
            {
                string title = string.Format(Messages.ACTION_MIGRATING_X_VDIS, _vdis.Count, SelectedSR.name_label);

                var batch = from VDI vdi in _vdis
                    select (AsyncAction)new MigrateVirtualDiskAction(connection, vdi, SelectedSR);

                new ParallelAction(connection, title, Messages.ACTION_MIGRATING_X_VDIS_STARTED,
                    Messages.ACTION_MIGRATING_X_VDIS_COMPLETED, batch.ToList(), BATCH_SIZE).RunAsync();
            }
        }
    }
}