private async Task <Charge> UpdateOrInsertCharge(User user, Transaction trans, double rate)
{
var charges = user.Charges.FindAll(x => x.ChargeDate.Month == DateTime.Now.Month && x.ChargeDate.Year == DateTime.Now.Year && x.currency == trans.Currency);
double amount = trans.Amount / rate;
var aux = double.Parse(_config[trans.Currency.ToString()]);
if (charges.Count > 0)
{
foreach (var charge in charges)
{
if (charge.amount + amount <= double.Parse(_config[trans.Currency.ToString()]))
{
// Ideally here we would check again for the rate of usd just in case it has changed, but because it only changes at the end and beginning of the day
// and not to waste a call to an external api I skipped this validation
// var currentRate = await _currencyService.GetRate(trans.Currency);
// if(trans.Amount / currentRate ){
// throw Exception()
// }
Charge userCharge = await _transactionContext.Charges.FindAsync(charge.UserId);
userCharge.amount = userCharge.amount + (trans.Amount / rate);
userCharge.ChargeDate = DateTime.Now;
_transactionContext.Entry(userCharge).CurrentValues.SetValues(userCharge);
_transactionContext.Entry(userCharge).State = EntityState.Modified;
await _transactionContext.SaveChangesAsync();
return(userCharge);
}
else
{
Exception excp = new ErrorHandler(HttpStatusCode.Forbidden, "The amount is invalid for the current month");
_logger.LogError(new EventId((int)HttpStatusCode.Forbidden, excp.Message), excp, excp.Message);
throw excp;
}
}
}
if (amount > double.Parse(_config[trans.Currency.ToString()]))
{
Exception excp = new ErrorHandler(HttpStatusCode.Forbidden, $"Invalid operation, the amount is greater than:{_config[trans.Currency.ToString()]}");
_logger.LogError(new EventId((int)HttpStatusCode.Forbidden, excp.Message), excp, excp.Message);
throw excp;
}
Charge newCharge = new Charge(amount, trans.Currency, DateTime.Now, user.UserId);
await _transactionContext.AddAsync(newCharge);
await _transactionContext.SaveChangesAsync();
return(newCharge);
}
public async Task <Transaction> CreateTransactionAsync(User sender, User recipient, decimal amount)
{
var transaction = new Transaction()
{
Id = Guid.NewGuid(), Sender = sender.Id, Recipient = recipient.Id, Amount = amount, BalanceSender = sender.Balance, BalanceRecipient = recipient.Balance, CreatedAt = DateTime.Now
};
await _transactionContext.AddAsync(transaction);
sender.Balance -= amount;
_userContext.Users.Update(sender);
recipient.Balance += amount;
_userContext.Users.Update(recipient);
await _transactionContext.SaveChangesAsync();
await _userContext.SaveChangesAsync();
return(transaction);
}