/*
 *
 * (c) Copyright Ascensio System Limited 2010-2021
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
*/

namespace ASC.Files.ThumbnailBuilder;

[Singletone]
public class ThumbnailService : IHostedService
{
    private readonly ICacheNotify<ThumbnailRequest> _cacheNotify;
    private readonly ILog _logger;

    public ThumbnailService(ICacheNotify<ThumbnailRequest> cacheNotify, ILog<ThumbnailService> logger)
    {
        _cacheNotify = cacheNotify;
        _logger = logger;
    }

    public Task StartAsync(CancellationToken cancellationToken)
    {
        _logger.Info("Thumbnail Service running.");

        _cacheNotify.Subscribe(BuildThumbnails, CacheNotifyAction.Insert);

        return Task.CompletedTask;
    }

    public Task StopAsync(CancellationToken cancellationToken)
    {
        _logger.Info("Thumbnail Service is stopping.");

        _cacheNotify.Unsubscribe(CacheNotifyAction.Insert);

        return Task.CompletedTask;
    }

    public void BuildThumbnails(ThumbnailRequest request)
    {
        foreach (var fileId in request.Files)
        {
            var fileData = new FileData<int>(request.Tenant, fileId, request.BaseUrl);

            FileDataQueue.Queue.TryAdd(fileId, fileData);
        }
    }
}