﻿// This file is Part of CalDavSynchronizer (http://outlookcaldavsynchronizer.sourceforge.net/)
// Copyright (c) 2015 Gerhard Zehetbauer
// Copyright (c) 2015 Alexander Nimmervoll
// 
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
// 
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using CalDavSynchronizer.ChangeWatching;
using CalDavSynchronizer.DataAccess;
using CalDavSynchronizer.Implementation;
using CalDavSynchronizer.Implementation.Events;
using GenSync;
using GenSync.Logging;
using GenSync.Synchronization;

namespace CalDavSynchronizer.Synchronization
{
    public class OutlookSynchronizer<TBtypeEntityId, TBtypeEntityVersion> : IOutlookSynchronizer
    {
        private readonly IPartialSynchronizer<string, DateTime, TBtypeEntityId, TBtypeEntityVersion> _synchronizer;

        public OutlookSynchronizer(IPartialSynchronizer<string, DateTime, TBtypeEntityId, TBtypeEntityVersion> synchronizer)
        {
            if (synchronizer == null)
                throw new ArgumentNullException(nameof(synchronizer));

            _synchronizer = synchronizer;
        }

        public Task Synchronize(ISynchronizationLogger logger)
        {
            return _synchronizer.Synchronize(logger);
        }

        public async Task SynchronizePartial(IEnumerable<IOutlookId> outlookIds, ISynchronizationLogger logger)
        {
            var idExtractor = new IdWithHintExtractor();
            foreach (var outlookId in outlookIds)
                outlookId.Accept(idExtractor);

            await _synchronizer.SynchronizePartial(idExtractor.Ids, new IIdWithHints<TBtypeEntityId, TBtypeEntityVersion>[] { }, logger);
        }

        class IdWithHintExtractor : IOutlookIdVisitor
        {
            public List<IIdWithHints<string, DateTime>> Ids { get; } = new List<IIdWithHints<string, DateTime>>();

            public void Visit(GenericId id)
            {
                Ids.Add(id.Inner);
            }

            public void Visit(ChangeWatching.AppointmentId id)
            {
                throw new NotSupportedException("Appointments are not supported!");
            }
        }
    }
}