/*
 *
 * (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.
 *
*/


using System.Reflection;

using ASC.Common;

using Microsoft.Extensions.Configuration;

namespace System.IO
{
    [Singletone]
    public class TempPath
    {
        readonly string tempFolder;

        public TempPath(IConfiguration configuration)
        {
            string rootFolder = AppContext.BaseDirectory;

            if (string.IsNullOrEmpty(rootFolder))
            {
                rootFolder = Assembly.GetEntryAssembly().Location;
            }

            tempFolder = configuration["temp"] ?? Path.Combine("..", "Data", "temp");

            if (!Path.IsPathRooted(tempFolder))
            {
                tempFolder = Path.GetFullPath(Path.Combine(rootFolder, tempFolder));
            }

            if (!Directory.Exists(tempFolder))
            {
                Directory.CreateDirectory(tempFolder);
            }
        }

        public string GetTempPath()
        {
            return tempFolder;
        }

        public string GetTempFileName()
        {
            FileStream f = null;
            string path;
            var count = 0;

            do
            {
                path = Path.Combine(tempFolder, Path.GetRandomFileName());

                try
                {
                    using (f = new FileStream(path, FileMode.CreateNew, FileAccess.ReadWrite, FileShare.Read))
                    {
                        return path;
                    }
                }
                catch (IOException ex)
                {
                    if (ex.HResult != -2147024816 || count++ > 65536)
                        throw;
                }
                catch (UnauthorizedAccessException ex)
                {
                    if (count++ > 65536)
                        throw new IOException(ex.Message, ex);
                }
            } while (f == null);

            return path;
        }
    }
}