Program.cs

using System;
using System.IO;
using System.Threading.Tasks;
using System.Windows.Forms;
using FileOrganizer.Services;
using FileOrganizer.Models;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

namespace FileOrganizer
{
    internal static class Program
    {
        [STAThread]
        static void Main(string[] args)
        {
            try
            {
                Application.EnableVisualStyles();
                Application.SetCompatibleTextRenderingDefault(false);

                var configuration = new ConfigurationBuilder()
                    .SetBasePath(AppDomain.CurrentDomain.BaseDirectory)
                    .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
                    .Build();

                var serviceProvider = ConfigureServices(configuration);

                var mainForm = serviceProvider.GetRequiredService<MainForm>();
                Application.Run(mainForm);
            }
            catch (Exception ex)
            {
                try
                {
                    File.AppendAllText("startup_error.log", $"[{DateTime.Now}] {ex}\n");
                }
                catch { }
                MessageBox.Show($"Critical error occurred:\n{ex.Message}\n\nPlease check startup_error.log for details.",
                    "Smart File Management System - Critical Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private static ServiceProvider ConfigureServices(IConfiguration configuration)
        {
            var services = new ServiceCollection();

            services.AddSingleton(configuration);
            services.Configure<AppConfig>(configuration.GetSection("AppSettings"));

            services.AddLogging(builder =>
            {
                builder.AddConfiguration(configuration.GetSection("Logging"));
                builder.AddFile(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "logs", "fileorganizer.log"));
                builder.AddConsole();
            });

            services.AddSingleton<IFileOrganizerService, FileOrganizerService>();
            services.AddSingleton<IFileTypeDetector, FileTypeDetector>();
            services.AddSingleton<IDuplicateHandler, DuplicateHandler>();
            services.AddSingleton<ILoggingService, LoggingService>();
            services.AddSingleton<IDatabaseService, DatabaseService>();
            services.AddSingleton<IStatisticsService, StatisticsService>();
            services.AddSingleton<ICleanupService, CleanupService>();
            services.AddSingleton<ISchedulerService, SchedulerService>();
            services.AddTransient<MainForm>();

            return services.BuildServiceProvider();
        }
    }
}