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 * *   Redistributions of source code must retain the above 
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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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using System;
using System.Threading;
using XenAdmin.Actions;
using XenAdmin.Core;
using XenAdmin.Diagnostics.Checks;
using XenAPI;


namespace XenAdmin.Diagnostics.Problems.VMProblem
{
    public class AutoStartEnabled : VMProblem
    {
        public AutoStartEnabled(Check check, VM vm)
            : base(check, vm)
        { }

        public override string Description
        {
            get { return string.Format(Messages.AUTOSTART_ENABLED_CHECK_DESCRIPTION, ServerName, Helpers.GetName(VM).Ellipsise(30)); }
        }

        protected override AsyncAction CreateAction(out bool cancelled)
        {
            cancelled = false;
            return new DelegatedAsyncAction(VM.Connection, Messages.ACTION_DISABLE_AUTOSTART_ON_VM, string.Format(Messages.ACTION_DISABLING_AUTOSTART_ON_VM, Helpers.GetName(VM)), null, ActionDelegate(false));
        }

        public override string HelpMessage
        {
            get { return Messages.DISABLE_NOAMP; }
        }

        private Action<Session> ActionDelegate(bool autostartValue)
        {
            return delegate(Session session)
                       {
                           var vm = VM.Connection.Resolve(new XenRef<VM>(VM.opaque_ref));
                           var vmclone = (VM)vm.Clone();
                           vm.Locked = true;
                           vmclone.SetAutoPowerOn(autostartValue);
                           try
                           {
                               vmclone.SaveChanges(session);
                           }
                           finally
                           {
                               vm.Locked = false;
                           }
                           int wait = 5000; // wait up to 5 seconds for the cache to be updated
                           while (wait > 0 && vm.GetAutoPowerOn() != autostartValue)
                           {
                               Thread.Sleep(100);
                               wait -= 100;
                           }
                       };
        }

        public override AsyncAction CreateUnwindChangesAction()
        {
            var vm = VM.Connection.Resolve(new XenRef<VM>(VM.opaque_ref));
            if (vm == null) // check if the vm is still in the cache
                return null;

            return new DelegatedAsyncAction(
               VM.Connection,
               Messages.ACTION_ENABLE_AUTOSTART_ON_VM,
               string.Format(Messages.ACTION_ENABLING_AUTOSTART_ON_VM, Helpers.GetName(vm)),
               null,
               ActionDelegate(true));
        }
    }
}