private Expense RegisterSimpleExpense(RegisterExpense simpleExpense, Payee payee)
{
var entity = (SimpleExpense)simpleExpense;
entity.Payee = payee;
#region Validations
if (simpleExpense.Payers?.Any() != true)
{
ModelState.AddModelError("Payers", "When registering a Simple Expense, you must specify at least one Payer.");
return(null);
}
#region Validate Payers
// TODO: validate duplications before calling the database
var payers = _roommates.GetByIds(simpleExpense.Payers.Select(x => x.Id).Distinct());
if (payers.Count() != simpleExpense.Payers.Count())
{
ModelState.AddModelError("Payers", "At least one Payer is invalid, does not represent a registered Roommate, or is duplicated.");
return(null);
}
else if (payers.Count() == 1 && payers.First().Id == payee.Id)
{
ModelState.AddModelError("Payers", "At this moment, self expenses are not supported. Please consider other alternatives.");
return(null);
}
var sum = simpleExpense.Payers.Sum(x => x.Amount * (decimal)x.Multiplier);
if (sum > 0)
{
ModelState.AddModelError("Payers", "An Expense cannot be proportional and even at the same time. Amount and Multiplier cannot be filled at the same time. Please, select only one.");
return(null);
}
entity.Payers = simpleExpense.Payers.Select(x => new Payer
{
Id = x.Id,
Amount = simpleExpense.Distribution.GetAmount(simpleExpense, x),
Name = payers.Single(p => p.Id == x.Id).Name
});
var total = entity.Payers.Sum(x => x.Amount);
if (total != simpleExpense.Total)
{
ModelState.AddModelError("Payers", "The total amount for this expense and the total amount by payers' distribution differ.");
return(null);
}
#endregion
#endregion
var result = _expenses.Add(entity);
if (result != null)
{
UpdateBalances(entity.Payers, entity.Payee, entity.Total);
}
return(result);
}
