public void Calculate_GST_Value()
{
// Arrange
decimal total = 1000.00m;
// Act
decimal gstValue = FinancialCalculations.CalculateGSTValueFromTotalGross(total);
// Assert
Assert.AreEqual(130.43m, gstValue);
}
/// <summary>
/// Extracts expense data from a block of text
/// </summary>
/// <param name="text">Text to process</param>
/// <param name="cancellationToken">Default cancellation token</param>
/// <returns></returns>
public async Task <ExpenseResourceModel> ExtractExpenseAsync(string text, CancellationToken cancellationToken = default)
{
ExpenseResourceModel resourceModel = new ExpenseResourceModel();
await Task.Run(() =>
{
if (string.IsNullOrEmpty(text))
{
throw new EmailProcessingException("Text block can not be empty");
}
// Load the email text as html doc
HtmlDocument htmlDocument = new HtmlDocument();
htmlDocument.LoadHtml(text);
// Detect tags that are not closed
if (htmlDocument.ContainsUnclosedTags())
{
throw new UnclosedTagException("Block of text has unclosed tag(s)");
}
// Extract data
HtmlNode expenseNode = htmlDocument.DocumentNode.SelectSingleNode("//expense");
if (expenseNode == null)
{
throw new EmailProcessingException("Expense element does not exist or is invalid");
}
if (expenseNode.HasChildNodes)
{
HtmlNode costCentre = expenseNode.SelectSingleNode("//cost_centre");
HtmlNode total = expenseNode.SelectSingleNode("//total");
HtmlNode paymentMethod = expenseNode.SelectSingleNode("//payment_method");
if (total == null)
{
throw new MissingElementException("Total node is required");
}
decimal totalValue = decimal.Parse(total.InnerText, CultureInfo.InvariantCulture);
resourceModel.CostCentre = costCentre != null ? costCentre.InnerText : "UNKNOWN";
resourceModel.Total = totalValue;
resourceModel.PaymentMethod = paymentMethod.InnerText;
resourceModel.TotalExcludingGST = FinancialCalculations.CalculateTotalNetFromTotalGross(totalValue);
resourceModel.GSTValue = FinancialCalculations.CalculateGSTValueFromTotalGross(totalValue);
}
}, cancellationToken);
return(resourceModel);
}
