using Microsoft.Extensions.DependencyInjection;

namespace Common.StartupHelpers;

public static class ServiceExtensions
{
    /// <summary>
    /// Adds a factory for subcontrols to be created.
    /// For example a UserControl can be instanciated using this Service.
    /// </summary>
    /// <typeparam name="TSubControl">type of the subcontrol</typeparam>
    /// <param name="services">existing service collection</param>
    public static void AddSubControlFactory<TSubControl>(this IServiceCollection services) where TSubControl : class
    {
        // add to DI: the subcontrol itself
        services.AddTransient<TSubControl>();
        // add to DI: Func of that subcontrol, that will create the subcontrol
        services.AddSingleton<Func<TSubControl>>(x => () => x.GetService<TSubControl>()!);
        // add to DI: Factory for the subcontrol
        services.AddSingleton<IAbstractFactory<TSubControl>, AbstractFactory<TSubControl>>();
    }
}