/// <summary>
/// Creator: Jaeho Kim
/// Created: 03/25/2020
/// Approver: Rasha Mohammed
///
/// Adds a product to the shopping cart.
/// </summary>
/// <remarks>
/// Updater: Robert Holmes
/// Updated: 5/5/2020
/// Update: try/catch around dangerous code.
/// </remarks>
/// <param name="e"></param>
/// <param name="sender"></param>
private void btnAddProduct_Click(object sender, RoutedEventArgs e)
{
var salesTax = new SalesTax();
try
{
// Populates the salesTax data transfer object by zipcode.
salesTax.ZipCode = txtZipCode.Text.ToString();
salesTax.TaxDate = _transactionManager
.RetrieveLatestSalesTaxDateByZipCode(txtZipCode.Text.ToString());
salesTax.TaxRate = _transactionManager
.RetrieveTaxRateBySalesTaxDateAndZipCode(txtZipCode.Text.ToString(), salesTax.TaxDate);
// SalesTax details operation now complete.
}
catch (Exception)
{
salesTax.TaxRate = 0M;
}
taxRate = salesTax.TaxRate;
bool isValid = false;
// The logic verifies that the product searched actually exists and is valid.
try
{
// Populates the productVM data transfer object using the product UPC number that was searched.
ProductVM productVM = new ProductVM()
{
ProductID = txtSearchProduct.Text.ToString(),
Name = txtItemName.Text.ToString(),
Taxable = chkTaxable.IsChecked == true,
Price = decimal.Parse(txtPrice.Text),
Quantity = int.Parse(txtQuantity.Text),
ItemDescription = txtItemDescription.Text.ToString(),
ItemQuantity = quantityInStock,
Active = true
};
isValid = _transactionManager.isItemQuantityValid(_transactionManager.GetAllProducts(), productVM);
if (isValid)
{
_transactionManager.AddProduct(productVM);
// If the product is taxable, add it to the taxable product list.
if (productVM.Taxable)
{
_transactionManager.AddProductTaxable(productVM);
}
clearFields();
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
if (isValid == false)
{
// Let the user know that the item quantity did not get entered.
MessageBox.Show("Invalid Item Quantity");
}
// Displays all the products on the data grid.
dgShoppingCart.ItemsSource = _transactionManager.GetAllProducts();
// CalculateSubTotal, takes the master list of products.
// The reason for storing the variable is the value obtained from the CalculateSubTotal
// is going to be passed to calculate the total.
subTotal = _transactionManager.CalculateSubTotal(_transactionManager.GetAllProducts());
txtSubTotal.Text = subTotal.ToString();
// CalculateSubTotalTaxable, takes the taxable list of products.
// The reason for storing the variable is the value obtained from the CalculateSubTotal
// is going to be passed to calculate the tax.
subTotalTaxable = _transactionManager.CalculateSubTotalTaxable(_transactionManager.GetTaxableProducts());
txtSubTotalTaxable.Text = subTotalTaxable.ToString();
// tax exempt simply means the tax rate is zero. Zero (tax rate)
// multiply with sub total taxable is zero. Zero add sub total
// is simply the total without tax.
if (!String.IsNullOrWhiteSpace(txtTaxExemptNumber.Text))
{
salesTax.TaxRate = 0;
}
// Calculates the total.
total = _transactionManager.CalculateTotal(subTotal, subTotalTaxable, salesTax);
txtTotal.Text = total.ToString();
}
