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using System.Collections.Generic;
using XenAdmin.Core;
using XenAdmin.Network;
using XenAPI;


namespace XenAdmin.Wizards.PatchingWizard.PlanActions
{
    public class RebootHostPlanAction : RebootPlanAction, IAvoidRestartHostsAware
    {

        private readonly Host _host;
        public List<string> AvoidRestartHosts { private get; set; }
        
        public RebootHostPlanAction(Host host)
            : base(host.Connection, new XenRef<Host>(host.opaque_ref), string.Format(Messages.UPDATES_WIZARD_REBOOTING, host))
        {
            _host = host;
            visible = false;
        }

        protected override void RunWithSession(ref Session session)
        {
            // If there are no patches that require reboot, we skip the evacuate-reboot-bringbabiesback sequence
            if (Helpers.ElyOrGreater(_host) && AvoidRestartHosts != null && AvoidRestartHosts.Contains(_host.uuid))
            {
                log.Debug("Skipping scheduled restart (livepatching succeeded). RebootHostPlanAction is skipped.");

                return;
            }

            visible = true;

            _host.Connection.ExpectDisruption = true;
            try
            {
                base.WaitForReboot(ref session, _session => XenAPI.Host.async_reboot(_session, Host.opaque_ref));
                foreach (var host in _host.Connection.Cache.Hosts)
                    host.CheckAndPlugPBDs();  // Wait for PBDs to become plugged on all hosts
            }
            finally
            {
                _host.Connection.ExpectDisruption = false;
            }
        }

        internal void RunExternal(Session session)
        {
            RunWithSession(ref session);
        }
    }
}