using Microsoft.Extensions.DependencyInjection;
using xCommons.Extensions;
using xIdentityModels.Interfaces;
using xIdentityModels.Providers;

namespace xIdentityModels.Extensions {
    public static class DIExtensions {
        /// <summary>
        /// since registering IXUserRoleHelper need to add default instance if
        /// user not provided we create this helper ...
        /// </summary>
        /// <param name="services"></param>
        public static void AddXUserRoleHandler (
            this IServiceCollection services,
            IXUserRoleHelper helper = null
        ) {
            //
            // Check if Provider is null ...
            if (helper.IsNull ()) {
                helper = services.GetRegisteredService<IXUserRoleHelper> ();
            }

            //
            // check if Provider registered or not ...
            if (helper.IsNull ()) {
                //
                // Create Default provider ...
                services.AddSingleton<IXUserRoleHelper> (new XDefaultUserRoleHelper ());
            } else {
                //
                // Register Given Helper ...
                services.AddSingleton<IXUserRoleHelper> (helper);
            }
        }
    }
}