Program.cs

using MulderConfig.Actions;
using MulderConfig.Configuration;
using MulderConfig.Save;
using MulderConfig.Apply;
using MulderConfig.UI;
using MulderConfig;

namespace MulderConfig;

internal static class Program
{
    /// <summary>
    ///  The main entry point for the application.
    /// </summary>
    [STAThread]
    static void Main(string[] args)
    {
        // Read and validate config
        ConfigModel config;
        try
        {
            config = ConfigProvider.GetConfig();
        } 
        catch (Exception ex)
        {
            MessageBox.Show($"Error loading configuration:\n{ex.Message}");
            return;
        }
        if (!ConfigValidator.IsValid(config))
        {
            MessageBox.Show("Error loading configuration:\nThe file 'MulderConfig.json' has invalid data.");
            return;
        }

        // Initialize core components
        var exeReplacer = new ExeReplacer(config);
        var fileOperationManager = new FileOperationManager();
        var modeDetector = new ModeDetector(config, args);
        var saveLoader = new SaveLoader();
        var saveSaver = new SaveSaver(saveLoader);
        var steamAddonHandler = new SteamAddonHandler(config, args);
        var applyManager = new ApplyManager(config, exeReplacer, fileOperationManager);

        // Handle Steam Addons
        var steamAddonId = steamAddonHandler.ResolveAddonId();
        var title = steamAddonHandler.ResolveAddonTitle(steamAddonId) ?? config.Game.Title;

        // Select current addon save
        saveLoader.LoadAll();
        var save = saveLoader.Load(title);
        if (!SaveValidator.IsValid(config, save))
        {
            MessageBox.Show($"Invalid configuration for {title}.\nThe save file may be corrupted (delete MulderConfig.save.json).");
            return;
        }

        // Run App
        if (modeDetector.IsApplyMode())
        {
            applyManager.Apply(title, save);
        }
        else if (modeDetector.IsLaunchMode())
        {
            var launchManager = new LaunchManager(config, title, save);
            launchManager.Launch();
        }
        else
        {
            // Initialize UI components
            var formSelectionProvider = new FormSelectionProvider(config);
            var formValidator = new FormValidator(config, formSelectionProvider);
            var formBuilder = new FormBuilder(formValidator, formSelectionProvider);

            // Normal UI mode
            ApplicationConfiguration.Initialize();
            Application.Run(new Form1(
                title,
                config,
                applyManager,
                formBuilder,
                formValidator,
                formSelectionProvider,
                saveLoader,
                saveSaver));
        }
    }
}