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 *     following disclaimer. 
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using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
using XenAdmin.Actions;
using XenAdmin.Properties;
using XenAPI;
using XenAdmin.Dialogs;
using XenAdmin.Actions.VMActions;


namespace XenAdmin.Commands
{
    /// <summary>
    /// Shuts down the selected VMs. Shows a confirmation dialog.
    /// </summary>
    internal class ShutDownVMCommand : VMLifeCycleCommand
    {
        /// <summary>
        /// Initializes a new instance of this Command. The parameter-less constructor is required if 
        /// this Command is to be attached to a ToolStrip menu item or button. It should not be used in any other scenario.
        /// </summary>
        public ShutDownVMCommand()
        {
        }

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

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

        public ShutDownVMCommand(IMainWindow mainWindow, VM vm, Control parent)
            : base(mainWindow, vm, parent)
        {
        }

        protected override bool CanExecute(VM vm)
        {
            return vm != null && vm.allowed_operations != null && vm.allowed_operations.Contains(vm_operations.clean_shutdown);
        }

        protected override void Execute(List<VM> vms)
        {
            RunAction(vms, Messages.ACTION_VM_SHUTTING_DOWN, Messages.ACTION_VM_SHUTTING_DOWN, Messages.ACTION_VM_SHUT_DOWN, null);
        }

        public override string MenuText
        {
            get
            {
                return Messages.MAINWINDOW_SHUTDOWN;
            }
        }

        public override Image MenuImage
        {
            get
            {
                return Resources._001_ShutDown_h32bit_16;
            }
        }

        public override Keys ShortcutKeys
        {
            get
            {
                return Keys.Control | Keys.E;
            }
        }

        public override string ShortcutKeyDisplayString
        {
            get
            {
                return Messages.MAINWINDOW_CTRL_E;
            }
        }

        protected override bool ConfirmationRequired
        {
            get
            {
                return true;
            }
        }

        protected override string ConfirmationDialogText
        {
            get
            {
                SelectedItemCollection selection = GetSelection();
                if (selection.Count == 1)
                {
                    VM vm = (VM)selection[0].XenObject;
                    return vm.HAIsProtected ? Messages.HA_CONFIRM_SHUTDOWN_VM : Messages.CONFIRM_SHUTDOWN_VM;
                }

                return Messages.CONFIRM_SHUTDOWN_VMS;
            }
        }

        protected override string ConfirmationDialogTitle
        {
            get
            {
                if (GetSelection().Count == 1)
                {
                    return Messages.CONFIRM_SHUTDOWN_VM_TITLE;
                }
                return Messages.CONFIRM_SHUTDOWN_VMS_TITLE;
            }
        }

        protected override string ConfirmationDialogHelpId
        {
            get { return "WarningVmLifeCycleShutdown"; }
        }

        protected override string GetCantExecuteReasonCore(SelectedItem item)
        {
            VM vm = (VM)item.XenObject;
            if (vm == null)
                return base.GetCantExecuteReasonCore(item);

            switch (vm.power_state)
            {
                case vm_power_state.Halted:
                    return Messages.VM_SHUT_DOWN;
                case vm_power_state.Paused:
                    return Messages.VM_PAUSED;
                case vm_power_state.Suspended:
                    return Messages.VM_SUSPENDED;
                case vm_power_state.unknown:
                    return base.GetCantExecuteReasonCore(item);
            }
            
            if (vm.virtualisation_status == VM.VirtualisationStatus.PV_DRIVERS_NOT_INSTALLED || vm.virtualisation_status == VM.VirtualisationStatus.UNKNOWN)
            {
                return FriendlyErrorNames.VM_MISSING_PV_DRIVERS;
            }
            
            if (vm.virtualisation_status == VM.VirtualisationStatus.PV_DRIVERS_OUT_OF_DATE)
            {
                return FriendlyErrorNames.VM_OLD_PV_DRIVERS;
            }
            return base.GetCantExecuteReasonCore(item);
        }

        protected override CommandErrorDialog GetErrorDialogCore(IDictionary<SelectedItem, string> cantExecuteReasons)
        {
            foreach (VM vm in GetSelection().AsXenObjects<VM>())
            {
                if (!CanExecute(vm) && vm.power_state != vm_power_state.Halted)
                {
                    return new CommandErrorDialog(Messages.ERROR_DIALOG_SHUTDOWN_VM_TITLE, Messages.ERROR_DIALOG_SHUTDOWN_VMS_TITLE, cantExecuteReasons);
                }
            }
            return null;
        }

        protected override AsyncAction BuildAction(VM vm)
        {
            return new VMCleanShutdown(vm);
        }
    }
}