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using System.Collections.Generic;
using XenAdmin.Core;
using XenAPI;
using System.Linq;
using System;
using XenAdmin.Actions;

namespace XenAdmin.Wizards.PatchingWizard.PlanActions
{
    class RemoveUpdateFileFromMasterPlanAction : PlanActionWithSession
    {
        private readonly List<PoolPatchMapping> patchMappings = new List<PoolPatchMapping>();
        private readonly XenServerPatch patch = null;
        private readonly Host master = null;

        public RemoveUpdateFileFromMasterPlanAction(Host master, List<PoolPatchMapping> patchMappings, XenServerPatch patch)
            : base(master.Connection, string.Format(Messages.UPDATES_WIZARD_REMOVING_UPDATES_FROM_POOL, master.Name()))
        {
            this.patchMappings = patchMappings;
            this.patch = patch;
            this.master = master;
        }

        protected override void RunWithSession(ref Session session)
        {
            try
            {
                var mapping = patchMappings.FirstOrDefault(pm => pm.MasterHost != null && master != null &&
                                                                 pm.MasterHost.uuid == master.uuid && pm.XenServerPatch.Equals(patch));

                if (!Helpers.ElyOrGreater(session.Connection))
                {
                    Pool_patch poolPatch = null;

                    if (mapping != null || mapping.Pool_patch != null && mapping.Pool_patch.opaque_ref != null)
                    {
                        poolPatch = mapping.Pool_patch;
                    }
                    else
                    {
                        poolPatch = session.Connection.Cache.Pool_patches.FirstOrDefault(pp => string.Equals(pp.uuid, patch.Uuid, System.StringComparison.InvariantCultureIgnoreCase));
                    }

                    if (poolPatch != null && poolPatch.opaque_ref != null)
                    {
                        var task = Pool_patch.async_pool_clean(session, mapping.Pool_patch.opaque_ref);
                        PollTaskForResultAndDestroy(Connection, ref session, task);

                        patchMappings.Remove(mapping);
                    }
                }
                else
                {
                    if (mapping != null || mapping.Pool_update != null && mapping.Pool_update.opaque_ref != null)
                    {
                        var poolUpdate = mapping.Pool_update;

                        Pool_update.pool_clean(session, poolUpdate.opaque_ref);
                        
                        if (!poolUpdate.AppliedOnHosts().Any())
                            Pool_update.destroy(session, poolUpdate.opaque_ref);

                        patchMappings.Remove(mapping);
                    }
                }
            }
            catch (Exception ex)
            {
                //best effort
                log.Error("Failed to remove update from the server.", ex);
            }
        }
    }
}