BaseController

namespace KittenApp.Web.Controllers
{
    using System.Text;
    using KittenApp.Data;
    using SimpleMvc.Framework.Controllers;
    using SimpleMvc.Framework.Interfaces;

    public abstract class BaseController : Controller
    {
        protected BaseController()
        {
            this.Context = new KittenAppContext();
            this.Model.Data["show-error"] = "none";
        }

        protected KittenAppContext Context { get; set; }

        protected IActionResult RedirectToHome() => this.RedirectToAction("/home/index");

        public override void OnAuthentication()
        {
            this.Model.Data["topMenu"] = this.User.IsAuthenticated ?
                @"<li class=""nav-item active"">
                    <a class=""nav-link"" href=""/"">Home</a>
                </li>
                <li class=""nav-item active"">
                    <a class=""nav-link"" href=""/kittens/all"">All Kittens</a>
                </li>
                <li class=""nav-item active"">
                    <a class=""nav-link"" href=""/kittens/add"">Add Kitten</a>
                </li>
                <li class=""nav-item active"">
                    <a class=""nav-link"" href=""/users/logout"">Logout</a>
                </li>" :
                @"<li class=""nav-item active"">
                    <a class=""nav-link"" href=""/"">Home</a>
                </li>
                <li class=""nav-item active"">
                    <a class=""nav-link"" href=""/users/login"">Login</a>
                </li>
                <li class=""nav-item active"">
                    <a class=""nav-link"" href=""/users/register"">Register</a>
                </li>";

            base.OnAuthentication();
        }

        protected void SetValidatorErrors()
        {
            var resultErrors = new StringBuilder();
            var errors = this.ParameterValidator.ModelErrors;
            foreach (var error in errors)
            {
                resultErrors.AppendLine($"<p>{string.Join(" ", error.Value)}</p>");
            }
            this.Model.Data["show-error"] = "block";
            this.Model.Data["error"] = resultErrors.ToString();
        }

        protected void ShowError(string error)
        {
            this.Model.Data["show-error"] = "block";
            this.Model.Data["error"] = error;
        }
    }
}