constellation-api/CH.CQRS/Command/Energy/CreateEnergyProviderCommand.cs

using CH.CQRS.Service.Energy;
using CH.CQRS.Service.Energy.Options;
using CH.Dal;
using CH.Dal.DbEntity;
using CH.Dal.Validators;
using FluentValidation;
using Microsoft.EntityFrameworkCore;
using OpenHarbor.CQRS.Abstractions;

namespace CH.CQRS.Command.Energy;

public class CreateEnergyProviderCommand
{
  public required string Name { get; set; }
  public bool Active { get; set; }
}
public class CreateEnergyProviderCommandHandler(EnergyService energyService) : ICommandHandler<CreateEnergyProviderCommand>
{
  public Task HandleAsync(CreateEnergyProviderCommand command, CancellationToken cancellationToken = new CancellationToken())
  {
    return energyService.CreateEnergyProviderAsync(new CreateEnergyProviderCommandOptions
    {
      Name = command.Name,
      Active = command.Active
    },cancellationToken);
  }
}

public class CreateEnergyProviderCommandValidator : AbstractValidator<CreateEnergyProviderCommand>
{
  public CreateEnergyProviderCommandValidator(CHDbContext dbContext)
  {
    RuleFor(command => command.Name)
      .NotEmpty()
      .MinimumLength(3)
      .MustAsync(async (name, cancellationToken) =>
      {
        var nameInUse = await dbContext.EnergyProviders.AnyAsync(energyProvider => energyProvider.Name == name, cancellationToken);
        return false == nameInUse;
      })
      .WithMessage("This Name is already in use by another energy provider.");
  }
}