ShopSolution-backend/Webshop.Application/ServiceResult.cs

// src/Webshop.Application/ServiceResult.cs
namespace Webshop.Application
{
    public enum ServiceResultType
    {
        Success,
        NotFound,
        InvalidInput,
        Conflict,
        Failure,
        Unauthorized,
        Forbidden
    }

    public class ServiceResult
    {
        public ServiceResultType Type { get; }
        public string? ErrorMessage { get; }

        protected ServiceResult(ServiceResultType type, string? errorMessage = null)
        {
            Type = type;
            ErrorMessage = errorMessage;
        }

        public static ServiceResult Ok() => new ServiceResult(ServiceResultType.Success);
        public static ServiceResult<T> Ok<T>(T value) => new ServiceResult<T>(value, ServiceResultType.Success);

        // Allgemeine Fail-Methode
        public static ServiceResult Fail(ServiceResultType type, string errorMessage) => new ServiceResult(type, errorMessage);

        // Generische Fail-Methode
        public static ServiceResult<T> Fail<T>(ServiceResultType type, string errorMessage) => new ServiceResult<T>(default, type, errorMessage);
    }

    public class ServiceResult<T> : ServiceResult
    {
        public T? Value { get; }

        protected internal ServiceResult(T? value, ServiceResultType type, string? errorMessage = null)
            : base(type, errorMessage)
        {
            Value = value;
        }
    }
}