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using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using XenAdmin.Actions;
using XenAdmin.Properties;
using XenAPI;

namespace XenAdmin.Commands
{
    class VappStartCommand : Command
    {
        public VappStartCommand()
        { }

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

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

        public override string ContextMenuText { get { return Messages.VAPP_START_CONTEXT_MENU; } }

        public override Image MenuImage { get { return Images.StaticImages._001_PowerOn_h32bit_16; } }

        protected override bool CanExecuteCore(SelectedItemCollection selection)
        {
            if (selection.AllItemsAre<VM_appliance>())
                return selection.AtLeastOneXenObjectCan<VM_appliance>(CanStartAppliance);

            if (selection.AllItemsAre<VM>())
            {
                var firstVm = (VM)selection.First;
                if (firstVm.IsAssignedToVapp)
                {
                    var firstVapp = firstVm.appliance;
                    if (selection.AsXenObjects<VM>().All(vm => vm.appliance != null && vm.appliance.opaque_ref == firstVapp.opaque_ref))
                        return CanStartAppliance(firstVm.Connection.Resolve(firstVapp));
                }
            }

            return false;
        }

        protected override void ExecuteCore(SelectedItemCollection selection)
        {
            var appsToStart = new List<VM_appliance>();

            if (selection.AllItemsAre<VM_appliance>())
            {
                appsToStart = (from IXenObject obj in selection.AsXenObjects()
                               let app = (VM_appliance)obj
                               where CanStartAppliance(app)
                               select app).ToList();
            }
            else if (selection.AllItemsAre<VM>())
            {
                var firstVm = (VM)selection.First;
                appsToStart.Add(firstVm.Connection.Resolve(firstVm.appliance));
            }

            foreach (var app in appsToStart)
                (new StartApplianceAction(app, false)).RunAsync();
        }

        private bool CanStartAppliance(VM_appliance app)
        {
            return app != null && app.allowed_operations.Contains(vm_appliance_operation.start);
        }
    }
}