using FluentValidation;
using FluentValidation.Results;
using System;
using System.Threading;
using System.Threading.Tasks;

namespace zero.Core.Validation
{
  public abstract class ZeroValidator<TInterface> : ZeroValidator<TInterface, TInterface>
  {
  }

  public abstract class ZeroValidator<TInterface, TImplementation> : AbstractValidator<TImplementation>, IValidator<TInterface> where TImplementation : TInterface
  {
    public ValidationResult Validate(TInterface instance)
    {
      if (!(instance is TImplementation))
      {
        throw new ArgumentException($"Parameter {nameof(instance)} has to be of type {typeof(TImplementation)}.");
      }
      return base.Validate((TImplementation)instance);
    }

    public Task<ValidationResult> ValidateAsync(TInterface instance, CancellationToken cancellation = default)
    {
      if (!(instance is TImplementation))
      {
        throw new ArgumentException($"Parameter {nameof(instance)} has to be of type {typeof(TImplementation)}.");
      }
      return base.ValidateAsync((TImplementation)instance, cancellation);
    }
  }
}