public WeightChangeDistribution Distribute(WeightSpan weightSpan, IList <ItemRecord> itemRecords)
{
var result = new WeightChangeDistribution();
if (!CanDistribute(weightSpan, itemRecords))
{
return(result);
}
var itemWeightChange = weightSpan.Change / itemRecords.Count;
foreach (var itemRecord in itemRecords)
{
result.Add(itemRecord.ItemId, new List <double> {
itemWeightChange
});
}
return(result);
}
public WeightChangeDistribution Distribute(WeightSpan weightSpan, IList <ItemRecord> itemRecords)
{
var result = new WeightChangeDistribution();
if (!CanDistribute(weightSpan, itemRecords))
{
return(result);
}
var itemGroups = itemRecords.GroupBy(ir => ir.ItemId).ToList();
var groupWeightChange = weightSpan.Change / itemGroups.Count;
itemGroups.ForEach(items =>
{
var itemWeightChange = groupWeightChange / items.Count();
var weightChanges = Enumerable.Repeat(itemWeightChange, items.Count()).ToList();
result.Add(items.Key, weightChanges);
});
return(result);
}
private bool CanDistribute(WeightSpan weightSpan, IList <ItemRecord> itemRecords) => weightSpan != null && Math.Abs(weightSpan.Change) > double.Epsilon && itemRecords != null && itemRecords.Any();
private bool CanDistribute(WeightSpan weightSpan, IList <ItemRecord> itemRecords) => weightSpan != null && itemRecords != null && itemRecords.Any();