/* Copyright (c) Citrix Systems, Inc. 
 * All rights reserved. 
 * 
 * Redistribution and use in source and binary forms, 
 * with or without modification, are permitted provided 
 * that the following conditions are met: 
 * 
 * *   Redistributions of source code must retain the above 
 *     copyright notice, this list of conditions and the 
 *     following disclaimer. 
 * *   Redistributions in binary form must reproduce the above 
 *     copyright notice, this list of conditions and the 
 *     following disclaimer in the documentation and/or other 
 *     materials provided with the distribution. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
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 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
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using System.Collections.Generic;
using System.Linq;
using XenAdmin.Core;
using XenAdmin.Network;
using XenAPI;


namespace XenAdmin.Actions
{
    public class AddRemoveRolesAction : PureAsyncAction
    {
        private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

        private readonly List<Role> _newRoles;
        private readonly Subject subject;

        public AddRemoveRolesAction(IXenConnection connection, Subject subject, List<Role> newRoles)
            : base(connection,
                string.Format(Messages.AD_ADDING_REMOVING_ROLES_ON, (subject.DisplayName ?? subject.SubjectName ?? subject.subject_identifier).Ellipsise(50)),
                Messages.AD_ADDING_REMOVING_ROLES,
                false)
        {
            var pool = Helpers.GetPool(connection);
            if (pool != null)
                Pool = pool;
            else
                Host = Helpers.GetCoordinator(connection);

            _newRoles = newRoles;
            this.subject = subject;
        }

        protected override void Run()
        {
            var serverRoles = Connection.Cache.Roles.Where(r => r.subroles.Count > 0).ToList();

            var toAdd = serverRoles.Where(role => _newRoles.Contains(role) &&
                                                  !subject.roles.Contains(new XenRef<Role>(role.opaque_ref))).ToList();

            var toRemove = serverRoles.Where(role => !_newRoles.Contains(role) &&
                                                     subject.roles.Contains(new XenRef<Role>(role.opaque_ref))).ToList();

            int count = toAdd.Count + toRemove.Count;
            int done = 0;
            var subj = subject.DisplayName ?? subject.SubjectName ?? subject.subject_identifier;

            foreach (Role r in toAdd)
            {
                log.DebugFormat("Adding role {0} to subject '{1}'.", r.FriendlyName(), subj);
                Subject.add_to_roles(Session, subject.opaque_ref, r.opaque_ref);
                PercentComplete = 100 * ++done / count;
            }

            foreach (Role r in toRemove)
            {
                log.DebugFormat("Removing role {0} from subject '{1}'.", r.FriendlyName(), subj);
                Subject.remove_from_roles(Session, subject.opaque_ref, r.opaque_ref);
                PercentComplete = 100 * ++done / count;
            }

            Description = Messages.COMPLETED;
        }
    }
}