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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.Text;
using XenAPI;
using XenAdmin.Dialogs;
using System.Windows.Forms;
using System.Collections.ObjectModel;
using System.Drawing;

namespace XenAdmin.Commands
{
    /// <summary>
    /// Shows the add-virtual-disk dialog for the selected VM or SR.
    /// </summary>
    internal class AddVirtualDiskCommand : Command
    {
        /// <summary>
        /// Initializes a new instance of this Command. The parameter-less constructor is required in the derived
        /// class if it is to be attached to a ToolStrip menu item or button. It should not be used in any other scenario.
        /// </summary>
        public AddVirtualDiskCommand()
        {
        }

        public AddVirtualDiskCommand(IMainWindow mainWindow, IEnumerable<SelectedItem> selection)
            : base(mainWindow, selection)
        {
        }

        public AddVirtualDiskCommand(IMainWindow mainWindow, VM vm)
            : base(mainWindow, vm)
        {
        }

        public AddVirtualDiskCommand(IMainWindow mainWindow, SR sr)
            : base(mainWindow, sr)
        {
        }

        protected override void ExecuteCore(SelectedItemCollection selection)
        {
            VM vm = selection[0].XenObject as VM;

            if (vm != null)
            {
                if (vm.VBDs.Count < vm.MaxVBDsAllowed)
                {
                    MainWindowCommandInterface.ShowPerXenModelObjectWizard(vm, new NewDiskDialog(vm.Connection, vm));
                }
                else
                {
                    using (var dlg = new ThreeButtonDialog(
                        new ThreeButtonDialog.Details(
                            SystemIcons.Error,
                            FriendlyErrorNames.VBDS_MAX_ALLOWED,
                            Messages.DISK_ADD)))
                    {
                        dlg.ShowDialog(Program.MainWindow);
                    }
                }
            }
            else
            {
                SR sr = (SR)selection[0].XenObject;
                MainWindowCommandInterface.ShowPerConnectionWizard(sr.Connection, new NewDiskDialog(sr.Connection, sr));
            }
        }

        protected override bool CanExecuteCore(SelectedItemCollection selection)
        {
            if (selection.Count == 1)
            {
                VM vm = selection[0].XenObject as VM;
                SR sr = selection[0].XenObject as SR;

                if (vm != null)
                {
                    return !vm.is_a_snapshot && !vm.Locked;
                }

                return sr != null && !sr.Locked;
            }
            return false;
        }
    }
}