/*
 *
 * (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.Common
{
    [Singletone]
    public class TempStream
    {
        private readonly TempPath _tempPath;

        public TempStream(TempPath tempPath) => _tempPath = tempPath;

        public Stream GetBuffered(Stream srcStream)
        {
            if (srcStream == null) throw new ArgumentNullException(nameof(srcStream));

            if (!srcStream.CanSeek || srcStream.CanTimeout)
            {
                //Buffer it
                var memStream = Create();
                srcStream.CopyTo(memStream);
                memStream.Position = 0;

                return memStream;
            }

            return srcStream;
        }

        public Stream Create() => new FileStream(_tempPath.GetTempFileName(), FileMode.OpenOrCreate, 
            FileAccess.ReadWrite, FileShare.Read, 4096, FileOptions.DeleteOnClose);
    }
}