Chain of responsibility

GetClass.cs

protected string GetClass(string code, bool approve)
{
    var request = new Request(code, approve, TrainingEvaluations, TrainningEffectiveness);

    if (request.CriteriaHasEvaluation)
    {
        return request.Evaluation.IsEvaluated
            ? request.Approve
                ? request.Evaluation.IsApproved
                    ? "approvedOn"
                    : "approvedOff"
                : !request.Evaluation.IsApproved
                    ? "reprovedOn"
                    : "reprovedOff"
            : request.Approve
                ? "approvedOff"
                : "reprovedOff";
    }

    if (request.IsNew) return approve ? "approvedOff" : "reprovedOff";

    if (!request.HasEffectiveness) return approve ? "approvedOff" : "reprovedOff";

    switch (request.Effectiveness.IsEffective)
    {
        case 0:
            return approve ? "approvedOff" : "reprovedOn";
        case 1:
            return approve ? "approvedOn" : "reprovedOff";
        default:
            return approve ? "approvedOff" : "reprovedOff";
    }
}