public async Task <CoinGateBillModel> CreateUserBilling(long userId, long txId)
{
using (var transaction = await _context.Database.BeginTransactionAsync())
{
try
{
var tokenTransaction = await _context.UserTokenTransactions
.Include(tt => tt.TokenBillings)
.FirstOrDefaultAsync(tt => tt.Id == txId && tt.CustomerId == userId && tt.IsPurchaseRequest);
if (tokenTransaction.TokenBillings.Where(tb => tb.InvoiceFullyPaid).LongCount() > 0 &&
tokenTransaction.ConfirmedDate >= tokenTransaction.AddedDate)
{
throw new TokenTransactionAlreadyConfirmedException();
}
if (tokenTransaction.TokenBillings.Where(tb => tb.CancelledDate < tb.CreatedDate &&
!tb.InvoiceFullyPaid).LongCount() > 0)
{
throw new PendingTokenBillingExistsException();
}
if (tokenTransaction.CancelledDate >= tokenTransaction.AddedDate)
{
throw new TokenTransactionAlreadyCancelledException();
}
var coinGateInvoiceModel = new CoinGateInvoiceTransferModel
{
OrderId = tokenTransaction.Id.ToString(),
PriceAmount = tokenTransaction.Amount * TokenRate,
PriceCurrency = "USD",
ReceiveCurrency = "BTC",
Title = "Pumpk1n Token Purchase Invoice",
Description = $"Receipt for purchase of {tokenTransaction.Amount} PKN"
};
var coinGateInvoiceReturnModel = await _tokenHelper.GenerateInvoice(coinGateInvoiceModel);
var tokenBilling =
_mapper.Map <CoinGateInvoiceReturnModel, TokenBilling>(coinGateInvoiceReturnModel);
tokenBilling.CreatedDate = DateTime.UtcNow;
tokenBilling.UserTokenTransactionId = tokenTransaction.Id;
tokenBilling.Name = coinGateInvoiceModel.Title;
tokenBilling.Description = coinGateInvoiceModel.Description;
_context.TokenBillings.Add(tokenBilling);
await _context.SaveChangesAsync();
transaction.Commit();
var tokenBillingModel = _mapper.Map <TokenBilling, CoinGateBillModel>(tokenBilling);
return(tokenBillingModel);
}
catch (Exception)
{
transaction.Rollback();
throw;
}
}
}