public DiscountPolicy ComposeDiscountPolicy(List <DbDiscountPolicy> dbDiscountPolicies)
{
if (dbDiscountPolicies.Count == 0)
{
return(new ConditionalBasketDiscount(0, new DiscountPreCondition(CommonStr.DiscountPreConditions.NoDiscount)));
}
else
{
Dictionary <DbDiscountPolicy, List <DbDiscountPolicy> > discountGraph = BuildDiscountPolicyGraph(dbDiscountPolicies);
DbDiscountPolicy root = GetRoot(discountGraph);
return(ConstrucuctDiscountRecursive(discountGraph, root));
}
}
private Dictionary <DbDiscountPolicy, List <DbDiscountPolicy> > BuildDiscountPolicyGraph(List <DbDiscountPolicy> dbDiscountPolicies)
{
Dictionary <DbDiscountPolicy, List <DbDiscountPolicy> > graph = new Dictionary <DbDiscountPolicy, List <DbDiscountPolicy> >();
foreach (DbDiscountPolicy dbDiscountPolicy in dbDiscountPolicies)
{
if (!graph.ContainsKey(dbDiscountPolicy))
{
graph.Add(dbDiscountPolicy, new List <DbDiscountPolicy>());
}
if (dbDiscountPolicy.ParentId != null)
{
DbDiscountPolicy parent = DbManager.Instance.getParentDiscount(dbDiscountPolicy);
if (!graph.ContainsKey(parent))
{
graph.Add(parent, new List <DbDiscountPolicy>());
}
graph[parent].Add(dbDiscountPolicy);
}
}
return(graph);
}
private DiscountPolicy ConstrucuctDiscountRecursive(Dictionary <DbDiscountPolicy, List <DbDiscountPolicy> > discountGraph, DbDiscountPolicy node)
{
if (discountGraph[node].Count == 0)
{
if (node.DiscountType == CommonStr.DiscountPolicyTypes.RevealdDiscount)
{
return(new RevealdDiscount((int)node.DiscountProductId, (int)node.Discount));
}
else if (node.DiscountType == CommonStr.DiscountPolicyTypes.ConditionalProductDiscount)
{
int?preCondition = node.PreConditionNumber;
if (preCondition != null)
{
DiscountPreCondition preConditionObj = new DiscountPreCondition((int)preCondition);
if (preCondition == CommonStr.DiscountPreConditions.NumUnitsOfProductAboveEqX)
{
return(new ConditionalProductDiscount(preConditionObj, (double)node.Discount, (int)node.MinProductUnits, (int)node.DiscountProductId));
}
else
{
return(null);
}
}
else
{
return(null);
}
}
else if (node.DiscountType == CommonStr.DiscountPolicyTypes.ConditionalBasketDiscount)
{
int?preCondition = node.PreConditionNumber;
if (preCondition != null)
{
DiscountPreCondition preConditionObj = new DiscountPreCondition((int)preCondition);
if (preCondition == CommonStr.DiscountPreConditions.BasketPriceAboveX)
{
return(new ConditionalBasketDiscount(preConditionObj, (double)node.Discount, (double)node.MinBasketPrice));
}
else if (preCondition == CommonStr.DiscountPreConditions.BasketProductPriceAboveEqX)
{
return(new ConditionalBasketDiscount((double)node.MinProductPrice, preConditionObj));
}
else if (preCondition == CommonStr.DiscountPreConditions.NumUnitsInBasketAboveEqX)
{
return(new ConditionalBasketDiscount(preConditionObj, (double)node.Discount, (int)node.MinUnitsAtBasket));
}
else
{
return(null);
}
}
else
{
return(null);
}
}
else
{
return(null);
}
}
if (node.DiscountType != CommonStr.DiscountPolicyTypes.CompundDiscount)
{
throw new Exception("should be compund discount type!");
}
List <DiscountPolicy> childrens = new List <DiscountPolicy>();
List <DbDiscountPolicy> dbChildrens = discountGraph[node];
foreach (DbDiscountPolicy dbchild in dbChildrens)
{
childrens.Add(ConstrucuctDiscountRecursive(discountGraph, dbchild));
}
return(new CompundDiscount((int)node.MergeType, childrens));
}