namespace BLAIzor.Services
{
    using Microsoft.Extensions.Hosting;
    using Microsoft.Extensions.Logging;
    using System.IO;
    using System.Threading;
    using System.Threading.Tasks;

    public class TempFileCleanupService : BackgroundService
    {
        private readonly ILogger<TempFileCleanupService> _logger;
        private readonly string _tempDirectory;
        private readonly TimeSpan _checkInterval = TimeSpan.FromMinutes(30);
        private readonly TimeSpan _fileLifetime = TimeSpan.FromHours(1);

        public TempFileCleanupService(ILogger<TempFileCleanupService> logger, IWebHostEnvironment env)
        {
            _logger = logger;
            _tempDirectory = Path.Combine(env.WebRootPath, "temp");
        }

        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
        {
            _logger.LogInformation("TempFileCleanupService started.");

            while (!stoppingToken.IsCancellationRequested)
            {
                try
                {
                    if (Directory.Exists(_tempDirectory))
                    {
                        var now = DateTime.UtcNow;
                        var files = Directory.GetFiles(_tempDirectory, "style_*.css");

                        foreach (var file in files)
                        {
                            var fileInfo = new FileInfo(file);
                            if (now - fileInfo.LastWriteTimeUtc > _fileLifetime)
                            {
                                fileInfo.Delete();
                                _logger.LogInformation($"Deleted old temp file: {fileInfo.Name}");
                            }
                        }
                    }
                }
                catch (Exception ex)
                {
                    _logger.LogError(ex, "Error occurred during temp file cleanup.");
                }

                await Task.Delay(_checkInterval, stoppingToken);
            }

            _logger.LogInformation("TempFileCleanupService stopped.");
        }
    }

}