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using System.Linq;
using System.Collections.Generic;
using XenAdmin.Core;
using XenAdmin.Wizards.CrossPoolMigrateWizard;
using XenAPI;
using XenAdmin.Dialogs.VMDialogs;


namespace XenAdmin.Commands
{
    /// <summary>
    /// Launches the Move-VM dialog for the selected VM.
    /// </summary>
    internal class MoveVMCommand : 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 MoveVMCommand()
        {
        }

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

        protected override void ExecuteCore(SelectedItemCollection selection)
        {
            var cmd = new CrossPoolMoveVMCommand(MainWindowCommandInterface, selection);
            var con = selection.GetConnectionOfFirstItem();

            if (cmd.CanExecute() && !Helpers.FeatureForbidden(con, Host.RestrictCrossPoolMigrate))
            {
                cmd.Execute();
            }
            else
            {
                VM vm = (VM) selection[0].XenObject;
                MainWindowCommandInterface.ShowPerXenModelObjectWizard(vm, new MoveVMDialog(vm));
            }
        }

        protected override bool CanExecuteCore(SelectedItemCollection selection)
        {
            return selection.AllItemsAre<VM>(CBTDisabled) &&
                   (new CrossPoolMoveVMCommand(MainWindowCommandInterface, selection).CanExecute() ||
                   selection.ContainsOneItemOfType<VM>(CanExecute));
        }

        private bool CBTDisabled(VM vm)
        {
            if (vm == null)
                return false;
            foreach (var vbd in vm.Connection.ResolveAll(vm.VBDs))
            {
                var vdi = vm.Connection.Resolve(vbd.VDI);
                if (vdi != null && vdi.cbt_enabled) 
                    return false;
            }
            return true;
        }

        private static bool CanExecute(VM vm)
        {
            return vm != null && (CrossPoolMoveVMCommand.CanExecute(vm, null, false) || vm.CanBeMoved());
        }

        public override string MenuText
        {
            get
            {
                return CrossPoolMoveVMCommand.GetWizardMode(GetSelection()) == WizardMode.Migrate
                           ? Messages.MAINWINDOW_MIGRATEVM
                           : Messages.MAINWINDOW_MOVEVM;
            }
        }
    }
}
