/// <summary>
/// Attempts to award the reward defined by the offer
/// </summary>
/// <param name="validatedAgainst">
/// The constrain by.
/// </param>
/// <param name="customer">
/// The customer.
/// </param>
/// <param name="applyConstraints">
/// Optional parameter indicating whether or not to apply constraints before attempting to award the reward.
/// Defaults to true.
/// </param>
/// <returns>
///
/// The <see cref="Attempt"/>.
/// </returns>
internal Attempt <IOfferResult <object, object> > TryToAward(object validatedAgainst, ICustomerBase customer, bool applyConstraints = true)
{
var result = new OfferResult <object, object>
{
Customer = customer,
Messages = new List <string>()
};
// ensure the offer is valid
var ensureOffer = this.EnsureValidOffer(result);
if (!ensureOffer.Success)
{
return(ensureOffer);
}
result = ensureOffer.Result as OfferResult <object, object>;
if (result == null)
{
throw new NullReferenceException("EnsureValidOffer returned a null Result");
}
Attempt <object> awardAttempt;
if (applyConstraints)
{
// apply the constraints
var constraintAttempt = this.TryApplyConstraints(validatedAgainst, customer);
result = PopulateConstraintOfferResult(result, constraintAttempt) as OfferResult <object, object>;
if (result == null)
{
throw new NullReferenceException("PopulateConstraintOfferResult returned null");
}
if (!constraintAttempt.Success)
{
return(Attempt <IOfferResult <object, object> > .Fail(result, constraintAttempt.Exception));
}
awardAttempt = OfferProcessor.TryAward(constraintAttempt.Result, customer);
result.ValidatedAgainst = constraintAttempt.Result;
}
else
{
awardAttempt = OfferProcessor.TryAward(validatedAgainst, customer);
result.ValidatedAgainst = validatedAgainst;
}
// get the reward
result.Award = awardAttempt.Result;
if (!awardAttempt.Success)
{
return(Attempt <IOfferResult <object, object> > .Fail(result, awardAttempt.Exception));
}
result.Messages.Add("AWARD - Success");
return(Attempt <IOfferResult <object, object> > .Succeed(result));
}
/// <summary>
/// The ensure offer is valid.
/// </summary>
/// <param name="customer">
/// The customer.
/// </param>
/// <typeparam name="TConstraint">
/// The type of constraint
/// </typeparam>
/// <typeparam name="TAward">
/// The type of award
/// </typeparam>
/// <returns>
/// The <see cref="Attempt"/>.
/// </returns>
internal Attempt <IOfferResult <TConstraint, TAward> > EnsureOfferIsValid <TConstraint, TAward>(ICustomerBase customer)
where TConstraint :
class
where TAward : class
{
var result = new OfferResult <object, object>
{
Customer = customer,
Messages = new List <string>()
};
return(this.EnsureValidOffer(result).As <TConstraint, TAward>());
}
/// <summary>
/// Attempts to apply the constraints against the offer.
/// </summary>
/// <param name="validatedAgainst">
/// The validated against.
/// </param>
/// <param name="customer">
/// The customer.
/// </param>
/// <typeparam name="TConstraint">
/// The type of constraint
/// </typeparam>
/// <typeparam name="TAward">
/// The type of offer award
/// </typeparam>
/// <returns>
/// The <see cref="Attempt"/>.
/// </returns>
public Attempt <IOfferResult <TConstraint, TAward> > TryApplyConstraints <TConstraint, TAward>(object validatedAgainst, ICustomerBase customer)
where TConstraint : class
where TAward : class
{
var result = new OfferResult <object, object>
{
Customer = customer,
Messages = new List <string>()
};
// ensure the offer is valid
var ensureOffer = this.EnsureValidOffer(result);
if (!ensureOffer.Success)
{
return(ensureOffer.As <TConstraint, TAward>());
}
result = ensureOffer.Result as OfferResult <object, object>;
if (result == null)
{
throw new NullReferenceException("EnsureValidOffer returned a null Result");
}
// attempt to validate against any constraints that have been configured
var constraintAttempt = TryApplyConstraints(validatedAgainst, customer);
result = PopulateConstraintOfferResult(result, constraintAttempt) as OfferResult <object, object>;
if (result == null)
{
throw new NullReferenceException("EnsureValidOffer returned a null Result");
}
if (!constraintAttempt.Success)
{
var exception = new Exception("Offer constraint validation failed.");
return(Attempt <IOfferResult <object, object> > .Fail(result, exception).As <TConstraint, TAward>());
}
result.ValidatedAgainst = validatedAgainst as TConstraint;
result.Messages.Add("PASSED - Constraint validation");
return(Attempt <IOfferResult <object, object> > .Succeed(result).As <TConstraint, TAward>());
}
