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 *     following disclaimer. 
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 *     copyright notice, this list of conditions and the 
 *     following disclaimer in the documentation and/or other 
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 * 
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using System.Collections.Generic;
using XenAPI;
using System.Linq;
using XenAdmin.Actions;


namespace XenAdmin.Commands
{
    /// <summary>
    /// Shows the properties dialog for the selected XenObject.
    /// </summary>
    internal class DisablePvsReadCachingCommand : 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>
        internal DisablePvsReadCachingCommand()
        {
        }

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

        public DisablePvsReadCachingCommand(IMainWindow mainWindow, IXenObject xenObject)
            : base(mainWindow, xenObject)
        {
        }

        protected virtual void Execute(IList<VM> vms)
        {
            var actions = new List<AsyncAction>();

            foreach (var vm in vms)
            {
                var pvsProxy = vm.PvsProxy;
                if (pvsProxy != null)
                    actions.Add(new PvsProxyDestroyAction(pvsProxy));
            }

            if (actions.Any())
            {
                if (actions.Count == 1)
                {
                    actions[0].RunAsync();
                }
                else
                {
                    new ParallelAction(
                        Messages.ACTION_DISABLE_PVS_READ_CACHING,
                        Messages.ACTION_DISABLING_PVS_READ_CACHING,
                        Messages.ACTION_DISABLED_PVS_READ_CACHING,
                        actions).RunAsync();
                }
            }
        }

        protected override void ExecuteCore(SelectedItemCollection selection)
        {
            Execute(selection.AsXenObjects<VM>());
        }

        protected override bool CanExecuteCore(SelectedItemCollection selection)
        {
            // Can execute criteria: A selection of VMs in the same pool, where at least one doesn't have PVS read caching enabled
            if (selection.Any() &&  selection.AllItemsAre<VM>() && selection.GetConnectionOfAllItems() != null)
            {
                var vms = selection.AsXenObjects<VM>();
                if (vms.Any(vm => vm.PvsProxy != null))
                {
                    return true;
                }
            }

            return false;
        }

        public override string ButtonText
        {
            get { return Messages.DISABLE_PVS_READ_CACHING_BUTTON; }
        }

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