/// <summary>Add a new beer for a specific brewery.</summary>
/// <param name="newBeer">The new beer to add.</param>
/// <returns>
/// A success result with the new beer as value.<br />
/// A failure result with Validation as error code if newBeer has params validation errors.<br />
/// A failure result with NotFound as error code if the brewery does not exist.
/// </returns>
public async Task <Result <Beer> > AddBeerAsync(Beer newBeer)
{
if (!newBeer.Is(BeerSpecifications.HasValidName))
{
return(Result.Failure(newBeer, ResultErrorCode.Validation, "The name should not be empty."));
}
if (!newBeer.Is(BeerSpecifications.HasValidStrength))
{
return(Result.Failure(newBeer, ResultErrorCode.Validation, "The strength should be greater or equal than zero."));
}
if (!newBeer.Is(BeerSpecifications.HasValidPrice))
{
return(Result.Failure(newBeer, ResultErrorCode.Validation, "The price should be greater than zero."));
}
if (!newBeer.Is(BeerSpecifications.HasValidBreweryId))
{
return(Result.Failure(newBeer, ResultErrorCode.Validation, "The brewery id should not be empty."));
}
var brewery = await _context.Breweries.FindAsync(newBeer.BreweryId);
if (brewery == null)
{
return(Result.Failure(newBeer, ResultErrorCode.NotFound, $"The brewery with {newBeer.BreweryId} was not found."));
}
await _context.Beers.AddAsync(newBeer);
await _context.SaveChangesAsync();
return(Result.Success(newBeer));
}