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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 
 *     materials provided with the distribution. 
 * 
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 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
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using System;
using System.Collections.Generic;
using XenAdmin.Core;
using XenAPI;


namespace XenAdmin.Wizards.PatchingWizard.PlanActions
{
    public class ApplyXenServerPatchPlanAction : PlanActionWithSession
    {
        private readonly Host host;
        private readonly XenServerPatch xenServerPatch;
        private readonly List<PoolPatchMapping> mappings;
        private readonly string masterUuid;

        public ApplyXenServerPatchPlanAction(Host host, XenServerPatch xenServerPatch, List<PoolPatchMapping> mappings)
            : base(host.Connection)
        {
            this.host = host;
            this.xenServerPatch = xenServerPatch;
            this.mappings = mappings;

            var master = Helpers.GetMaster(host.Connection);
            this.masterUuid = master.uuid;
        }

        protected override void RunWithSession(ref Session session)
        {
            var mapping = mappings.Find(m => m.XenServerPatch.Equals(xenServerPatch)
                                             && m.MasterHost != null && m.MasterHost.uuid == masterUuid);

            if (mapping != null && (mapping.Pool_patch != null || mapping.Pool_update != null))
            {
                try
                {
                    AddProgressStep(string.Format(Messages.UPDATES_WIZARD_APPLYING_UPDATE, xenServerPatch.Name,
                        host.Name()));

                    var task = mapping.Pool_patch == null
                        ? Pool_update.async_apply(session, mapping.Pool_update.opaque_ref, host.opaque_ref)
                        : Pool_patch.async_apply(session, mapping.Pool_patch.opaque_ref, host.opaque_ref);

                    PollTaskForResultAndDestroy(Connection, ref session, task);
                }
                catch (Failure f)
                {
                    if (f.ErrorDescription.Count > 1 && (f.ErrorDescription[0] == Failure.PATCH_ALREADY_APPLIED || f.ErrorDescription[0] == Failure.UPDATE_ALREADY_APPLIED))
                    {
                        log.InfoFormat("The update {0} is already applied on {1}. Ignoring this error.", xenServerPatch.Name, host.Name());
                        ReplaceProgressStep(string.Format(Messages.UPDATES_WIZARD_SKIPPING_UPDATE, xenServerPatch.Name, host.Name()));
                    }
                    else
                        throw;
                }
            }
            else
            {
                if (xenServerPatch != null)
                    log.ErrorFormat("Mapping not found for patch {0} on master {1}", xenServerPatch.Uuid, masterUuid);

                throw new Exception("Pool_patch or Pool_update not found.");
            }
        }
    }
}