/*
 * Copyright (c) 2023 Proton AG
 *
 * This file is part of ProtonVPN.
 *
 * ProtonVPN is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * ProtonVPN 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with ProtonVPN.  If not, see <https://www.gnu.org/licenses/>.
 */

using System.Security;
using ProtonVPN.Common.Core.Extensions;
using ProtonVPN.Logging.Contracts;
using ProtonVPN.Logging.Contracts.Events.AppLogs;

namespace ProtonVPN.Client.Logic.Feedback.Attachments.Sources;

public abstract class LogFileSourceBase : ILogFileSource
{
    private readonly ILogger _logger;
    private readonly string _path;
    private readonly int _maxNumOfFiles;
    private readonly long _maxFileSize;

    protected LogFileSourceBase(ILogger logger, long maxFileSize, string path, int maxNumOfFiles)
    {
        _logger = logger;
        _maxFileSize = maxFileSize;
        _path = path;
        _maxNumOfFiles = maxNumOfFiles;
    }

    public IEnumerable<string> Get()
    {
        try
        {
            return FileNames();
        }
        catch (Exception e) when (e.IsFileAccessException() || e is SecurityException)
        {
            _logger.Warn<AppFileAccessFailedLog>("Failed to add attachment(s).", e);
        }

        return Enumerable.Empty<string>();
    }

    private IEnumerable<string> FileNames()
    {
        DirectoryInfo directory = new(_path);
        IEnumerable<string> fileNames = directory
            .GetFiles()
            .Where(f => f.Length <= _maxFileSize)
            .OrderByDescending(p => p.LastWriteTimeUtc)
            .Take(_maxNumOfFiles)
            .Select(f => f.FullName);

        return fileNames;
    }
}