// (c) Copyright Ascensio System SIA 2010-2022
//
// This program is a free software product.
// You can redistribute it and/or modify it under the terms
// of the GNU Affero General Public License (AGPL) version 3 as published by the Free Software
// Foundation. In accordance with Section 7(a) of the GNU AGPL 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 details, see
// the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
//
// You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia, EU, LV-1021.
//
// The  interactive user interfaces in modified source and object code versions of the Program must
// display Appropriate Legal Notices, as required under Section 5 of the GNU AGPL version 3.
//
// Pursuant to Section 7(b) of the License you must retain the original Product logo when
// distributing the program. Pursuant to Section 7(e) we decline to grant you any rights under
// trademark law for use of our trademarks.
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// All the Product's GUI elements, including illustrations and icon sets, as well as technical writing
// content are licensed under the terms of the Creative Commons Attribution-ShareAlike 4.0
// International. See the License terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode

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.Object ?? string.Empty;
        if (!_byObjectId.ContainsKey(id))
        {
            _byObjectId[id] = new List<AzRecord>();
        }
        _byObjectId[id].RemoveAll(a => a.Subject == r.Subject && a.Action == r.Action); // remove escape, see DbAzService
        _byObjectId[id].Add(r);
    }

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

        var id = r.Object ?? string.Empty;
        if (_byObjectId.TryGetValue(id, out var list))
        {
            list.RemoveAll(a => a.Subject == r.Subject && a.Action == r.Action && a.AceType == r.AceType);
        }
    }

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

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