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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 
 *     materials provided with the distribution. 
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using System;
using System.Collections.Generic;
using XenAdmin.Core;
using XenAPI;
using XenAdmin.Network;
using XenAdmin.Diagnostics.Checks;


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

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

        protected override void RunWithSession(ref Session session)
        {
            var master = Helpers.GetMaster(Connection);
            var mapping = mappings.Find(m => m.XenServerPatch.Equals(patch) && m.MasterHost != null && master != null && m.MasterHost.uuid == master.uuid);

            if (mapping != null && (mapping.Pool_patch != null || mapping.Pool_update != null))
            {
                var livePatchStatus = new Dictionary<string, livepatch_status>();

                if (Cancelling)
                    throw new CancelledException();

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

                    PatchPrecheckCheck check = mapping.Pool_patch == null
                        ? new PatchPrecheckCheck(host, mapping.Pool_update, livePatchStatus)
                        : new PatchPrecheckCheck(host, mapping.Pool_patch, livePatchStatus);

                    var problems = check.RunAllChecks();

                    Diagnostics.Problems.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);
            }
        }
    }
}