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using System;
using System.Collections.Generic;
using System.Text;
using XenAPI;
using XenAdmin.Actions.VMActions;
using System.Collections.ObjectModel;


namespace XenAdmin.Commands
{
    /// <summary>
    /// Creates a VM from the specified template.
    /// </summary>
    internal class InstantVMFromTemplateCommand : Command
    {
        /// <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 InstantVMFromTemplateCommand()
        {
        }

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

        public InstantVMFromTemplateCommand(IMainWindow mainWindow, VM template)
            : base(mainWindow, template)
        {
        }

        protected override void ExecuteCore(SelectedItemCollection selection)
        {
           var createAction= new CreateVMFastAction(selection[0].Connection, selection[0].XenObject as VM);
           createAction.Completed += new EventHandler<EventArgs>(createAction_Completed);
            createAction.RunAsync();
        }

        static void createAction_Completed(object sender, EventArgs e)
        {
            CreateVMFastAction action = (CreateVMFastAction) sender;
            var startAction = new VMStartAction(action.Connection.Resolve(new XenRef<VM>(action.Result)), VMOperationCommand.WarningDialogHAInvalidConfig, VMOperationCommand.StartDiagnosisForm);
            startAction.RunAsync();
        }

        protected override bool CanExecuteCore(SelectedItemCollection selection)
        {
            return selection.ContainsOneItemOfType<VM>() && selection.AtLeastOneXenObjectCan<VM>(CanExecute);
        }

        private static bool CanExecute(VM vm)
        {
            return vm != null && vm.is_a_template && !vm.Locked && !vm.is_a_snapshot && vm.InstantTemplate;
        }

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