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 *     following disclaimer. 
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 *     following disclaimer in the documentation and/or other 
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using System;
using System.Collections.Generic;
using System.Linq;
using XenAdmin.Core;
using XenAPI;
using XenAdmin.Network;
using XenAdmin.Diagnostics.Checks;
using XenAdmin.Diagnostics.Problems;


namespace XenAdmin.Wizards.PatchingWizard.PlanActions
{
    class PatchPrecheckOnHostPlanAction : PlanActionWithSession
    {
        private readonly XenServerPatch xenServerPatch;
        private readonly List<HostUpdateMapping> mappings;
        private readonly Host host;
        private readonly List<string> hostsThatWillRequireReboot;

        public PatchPrecheckOnHostPlanAction(IXenConnection connection, XenServerPatch xenServerPatch, Host host, List<HostUpdateMapping> mappings, List<string> hostsThatWillRequireReboot)
            : base(connection)
        {
            this.xenServerPatch = xenServerPatch;
            this.host = host;
            this.mappings = mappings;
            this.hostsThatWillRequireReboot = hostsThatWillRequireReboot;
        }

        protected override void RunWithSession(ref Session session)
        {
            var master = Helpers.GetMaster(Connection);

            var mapping = (from HostUpdateMapping hum in mappings
                let xpm = hum as XenServerPatchMapping
                where xpm != null && xpm.Matches(master, xenServerPatch)
                select xpm).FirstOrDefault();

            if (mapping == null || !mapping.IsValid)
                return;

            var livePatchStatus = new Dictionary<string, livepatch_status>();

            if (Cancelling)
                throw new CancelledException();

            try
            {
                AddProgressStep(string.Format(Messages.UPDATES_WIZARD_RUNNING_PRECHECK, xenServerPatch.Name, host.Name()));

                List<Problem> problems = null;

                if (mapping is PoolPatchMapping patchMapping)
                    problems = new PatchPrecheckCheck(host, patchMapping.Pool_patch, livePatchStatus).RunAllChecks();
                else if (mapping is PoolUpdateMapping updateMapping)
                    problems = new PatchPrecheckCheck(host, updateMapping.Pool_update, livePatchStatus).RunAllChecks();
              
                Problem problem = null;

                if (problems != null && problems.Count > 0)
                    problem = problems[0];

                if (problem != null)
                    throw new Exception(problem.Description);
            }
            catch (Exception ex)
            {
                log.Error(string.Format("Precheck failed on host {0}", host.Name()), ex);
                throw;
            }

            if (livePatchStatus.ContainsKey(host.uuid)
                && livePatchStatus[host.uuid] != livepatch_status.ok_livepatch_complete
                && !hostsThatWillRequireReboot.Contains(host.uuid))
                hostsThatWillRequireReboot.Add(host.uuid);
        }
    }
}
