private void refreshView()
{
UxError.Text = string.Empty;
using (var context = new CashboxDbContext())
{
var accounts = context.Accounts.ToList();
UxAccounts.ItemsSource = accounts;
var products = context.Products.ToList();
UxProducts.ItemsSource = products;
}
}
private void UxAccounts_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (UxAccounts.SelectedItem == null)
return;
UxError.Text = string.Empty;
using (var context = new CashboxDbContext())
{
var account = (Account)UxAccounts.SelectedItem;
context.Accounts.Attach(account);
UxOrders.ItemsSource = account.Orders;
}
}
private decimal calculateDiscount(CashboxDbContext context, int accountId, decimal selectedPoductsTotal)
{
var discount = 0.0m;
// If account has orders with sum total >= 500 then give 10% discount.
var sum = context.Orders.Where(x => x.AccountId == accountId).Sum(x => (decimal?)x.Total) ?? 0;
if (sum >= 500)
{
discount += 0.1m;
}
// If the new order has total >= 200 then give an additional 5% discount.
if (selectedPoductsTotal >= 200)
{
discount += 0.05m;
}
return discount;
}
private void UxProducts_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (UxAccounts.SelectedItem == null || UxProducts.SelectedItems == null)
return;
UxError.Text = string.Empty;
using (var context = new CashboxDbContext())
{
var accountId = ((Account)UxAccounts.SelectedItem).Id;
var total = calculateSelectedProductsTotal();
var discount = calculateDiscount(context, accountId, total);
var totalAfterDiscount = applyDiscount(total, discount);
UxTotal.Text = total.ToString();
UxDiscount.Text = Math.Round(discount * 100, 0) + "%";
UxTotalAfterDiscount.Text = totalAfterDiscount.ToString();
}
}
private void UxPurchase_Click(object sender, System.Windows.RoutedEventArgs e)
{
if (UxAccounts.SelectedItem == null)
return;
using (var context = new CashboxDbContext())
{
var account = (Account)UxAccounts.SelectedItem;
context.Accounts.Attach(account);
var total = calculateSelectedProductsTotal();
var discount = calculateDiscount(context, account.Id, total);
var totalAfterDiscount = applyDiscount(total, discount);
if (totalAfterDiscount <= account.Balance)
{
context.Orders.Add(
new Order
{
Account = account,
Date = DateTime.Now,
Total = total
});
account.Balance -= total;
foreach (var product in getSelectedProducts())
{
context.Products.Attach(product);
product.Amount--;
}
context.SaveChanges();
refreshView();
}
else
{
UxError.Text = "Not enough money!";
}
}
}
