/*
 *
 * (c) Copyright Ascensio System Limited 2010-2018
 *
 * This program is freeware. You can redistribute it and/or modify it under the terms of the GNU 
 * General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html). 
 * In accordance with Section 7(a) of the GNU GPL its Section 15 shall be amended to the effect that 
 * Ascensio System SIA expressly excludes the warranty of non-infringement of any third-party rights.
 *
 * THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR
 * FITNESS FOR A PARTICULAR PURPOSE. For more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
 *
 * You can contact Ascensio System SIA by email at sales@onlyoffice.com
 *
 * The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display 
 * Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
 *
 * Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains 
 * relevant author attributions when distributing the software. If the display of the logo in its graphic 
 * form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE" 
 * in every copy of the program you distribute. 
 * Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
 *
*/


using System.Collections;
using System.Collections.Generic;
using System.Linq;

namespace ASC.Core.Caching
{
    class AzRecordStore : IEnumerable<AzRecord>
    {
        private readonly Dictionary<string, List<AzRecord>> byObjectId = new Dictionary<string, List<AzRecord>>();


        public AzRecordStore(IEnumerable<AzRecord> aces)
        {
            foreach (var a in aces)
            {
                Add(a);
            }
        }


        public IEnumerable<AzRecord> Get(string objectId)
        {
            byObjectId.TryGetValue(objectId ?? string.Empty, out var aces);
            return aces ?? new List<AzRecord>();
        }

        public void Add(AzRecord r)
        {
            if (r == null) return;

            var id = r.ObjectId ?? string.Empty;
            if (!byObjectId.ContainsKey(id))
            {
                byObjectId[id] = new List<AzRecord>();
            }
            byObjectId[id].RemoveAll(a => a.SubjectId == r.SubjectId && a.ActionId == r.ActionId); // remove escape, see DbAzService
            byObjectId[id].Add(r);
        }

        public void Remove(AzRecord r)
        {
            if (r == null) return;

            var id = r.ObjectId ?? string.Empty;
            if (byObjectId.ContainsKey(id))
            {
                byObjectId[id].RemoveAll(a => a.SubjectId == r.SubjectId && a.ActionId == r.ActionId && a.Reaction == r.Reaction);
            }
        }

        public IEnumerator<AzRecord> GetEnumerator()
        {
            return byObjectId.Values.SelectMany(v => v).GetEnumerator();
        }

        IEnumerator IEnumerable.GetEnumerator()
        {
            return GetEnumerator();
        }
    }
}