private static AmountBasedReward EvaluateBestAmountReward(decimal currentAmount, AmountBasedReward[] promoRewards)
{
AmountBasedReward retVal = null;
var maxAbsoluteReward = promoRewards
.Where(y => y.AmountType == RewardAmountType.Absolute)
.OrderByDescending(y => y.Amount).FirstOrDefault();
var maxRelativeReward = promoRewards
.Where(y => y.AmountType == RewardAmountType.Relative)
.OrderByDescending(y => y.Amount).FirstOrDefault();
var absDiscountAmount = maxAbsoluteReward != null ? maxAbsoluteReward.Amount : 0;
var relDiscountAmount = maxRelativeReward != null ? currentAmount * maxRelativeReward.Amount : 0;
if (maxAbsoluteReward != null && maxRelativeReward != null)
{
if (absDiscountAmount > relDiscountAmount)
{
retVal = maxAbsoluteReward;
}
else
{
retVal = maxRelativeReward;
}
}
else if (maxAbsoluteReward != null)
{
retVal = maxAbsoluteReward;
}
else if (maxRelativeReward != null)
{
retVal = maxRelativeReward;
}
return retVal;
}
private static AmountBasedReward[] EvaluteBestAmountRewards(decimal currentAmount, AmountBasedReward[] promoRewards)
{
var retVal = new List<AmountBasedReward>();
var bestReward = EvaluateBestAmountReward(currentAmount, promoRewards.Where(x => x.IsValid).ToArray());
if (bestReward != null)
{
retVal.Add(bestReward);
}
var bestPotentialReward = EvaluateBestAmountReward(currentAmount, promoRewards.Where(x => !x.IsValid).ToArray());
if (bestPotentialReward != null && bestReward != null)
{
var bestRewardFromTwo = bestReward = EvaluateBestAmountReward(currentAmount, new AmountBasedReward[] { bestReward, bestPotentialReward });
if (bestRewardFromTwo == bestPotentialReward)
{
retVal.Add(bestPotentialReward);
}
}
else if (bestPotentialReward != null)
{
retVal.Add(bestPotentialReward);
}
return retVal.ToArray();
}