public ExpenseItem CreateNew(Expense expense)
{
var result = DataContext.ExpenseItem.Create();
result.Expense = expense;
result.CreatedDate = DateTime.Now;
expense.Items.Add(result);
return result;
}
public IEnumerable<CostCalculatorItem> CalculateCosts(Expense expense, IEnumerable<Contracts.ExpenseItemLightDto> expenseItems)
{
var pricing = expense.Pricing;
if (pricing == null)
yield break;
var countOfExpenses = expenseItems.Count();
var amountTotalSum = expenseItems.Sum(e => e.Amount);
var expensesPerUser = expenseItems.GroupBy(ae => ae.CreatorId);
foreach (var u in expensesPerUser)
{
var amountPerUser = u.Sum(ui => ui.Amount);
decimal userCost = 0;
// per user
userCost += pricing.CostPerSingleUser ?? 0;
// per one quantity amount
if (pricing.CostPerOneQuantity.HasValue)
userCost += amountPerUser * pricing.CostPerOneQuantity.Value;
// by total cost (based on total cost and total quantity amount)
if (pricing.Cost.HasValue)
userCost += pricing.Cost.Value * amountPerUser / amountTotalSum;
if (userCost == 0)
continue;
yield return new CostCalculatorItem()
{
Cost = userCost,
UserId = u.Key
};
}
}
public Contracts.ExpenseItemLightDto[] FetchForExpense(Expense expense)
{
return DataContext
.ExpenseItemsAsLightDto.Where(e => e.ExpenseId == expense.Id)
.ToArray();
}