private static IReadOnlyList <PaymentShippingOption> CreateShippingOptions(ShoppingCart shoppingCart)
{
List <PaymentShippingOption> paymentShippingOptions = new List <PaymentShippingOption>();
ShippingType selectedShippingType = shoppingCart.ShippingType;
IReadOnlyDictionary <ShippingType, ShoppingCartCostsSummary> cartShippingOptions = shoppingCart.CalculateShippingOptions();
ShoppingCartCostsSummary costsOfSelectedShipping = cartShippingOptions[selectedShippingType];
foreach (var kvp in cartShippingOptions)
{
ShippingType shippingType = kvp.Key;
ShoppingCartCostsSummary costs = kvp.Value;
PaymentShippingOption shippingOption = new PaymentShippingOption(
label: ShippingTypeStringUtilities.CreateShippingOptionTitle(shippingType, costs, costsOfSelectedShipping),
selected: (shippingType == selectedShippingType),
tag: shippingType.ToString(),
amount: CreateCurrencyAmount(costs.Shipping));
paymentShippingOptions.Add(shippingOption);
}
return(paymentShippingOptions);
}
/// <summary>
/// Updates the strings that display the cost summary (e.g. sub-total, tax, etc.) of the shopping cart.
/// </summary>
private void UpdateCostsSummaryStrings()
{
ShoppingCartCostsSummary costsSummary = this.ShoppingCart.CostsSummary;
// Update values.
this.SubtotalString = PriceStringUtilities.CreatePriceString(costsSummary.ItemsSubtotal);
this.EstimatedShippingString = PriceStringUtilities.CreatePriceString(costsSummary.Shipping);
this.ShippingTypeString = ShippingTypeStringUtilities.GetFriendlyNameOfShippingType(this.ShoppingCart.ShippingType);
this.EstimatedTaxString = PriceStringUtilities.CreatePriceString(costsSummary.TotalTax);
this.TotalCostString = PriceStringUtilities.CreatePriceString(costsSummary.Total);
// Raise all the 'PropertyChanged' events.
this.RaisePropertyChanged(nameof(this.SubtotalString));
this.RaisePropertyChanged(nameof(this.EstimatedShippingString));
this.RaisePropertyChanged(nameof(this.ShippingTypeString));
this.RaisePropertyChanged(nameof(this.EstimatedTaxString));
this.RaisePropertyChanged(nameof(this.TotalCostString));
}
/// <summary>
/// Create the friendly name of a shipping option (including cost).
/// </summary>
public static string CreateShippingOptionTitle(ShippingType type, ShoppingCartCostsSummary costs, ShoppingCartCostsSummary currentTotalCost)
{
string shippingName = GetFriendlyNameOfShippingType(type);
if (costs.Total == currentTotalCost.Total)
{
return(shippingName);
}
else
{
decimal costDifference = costs.Total - currentTotalCost.Total;
if (costDifference >= 0)
{
return($"{shippingName}: +{PriceStringUtilities.CreatePriceString(costDifference)}");
}
else
{
return($"{shippingName}: -{PriceStringUtilities.CreatePriceString(-costDifference)}");
}
}
}
/// <summary>
/// Calculate the summary of costs (e.g. sub-total, tax, etc.) for the given list of shopping cart entries.
/// </summary>
private static ShoppingCartCostsSummary CalculateCostsSummary(IReadOnlyList <ShoppingCartEntry> entries, ShippingType shippingType, PaymentAddress shippingAddress)
{
ShoppingCartCostsSummary costsSummary = new ShoppingCartCostsSummary();
foreach (ShoppingCartEntry entry in entries)
{
costsSummary.ItemsSubtotal += entry.Quantity * entry.Product.Cost;
costsSummary.Shipping += entry.Product.ShippingCost.Costs[shippingType];
}
costsSummary.Shipping += ShippingFixedCosts.Costs[shippingType];
CalculateTax(
shippingAddress,
costsSummary.ItemsSubtotal,
costsSummary.Shipping,
out costsSummary.ItemsTax,
out costsSummary.ShippingTax);
costsSummary.TotalTax = costsSummary.ItemsTax + costsSummary.ShippingTax;
costsSummary.Total = costsSummary.ItemsSubtotal + costsSummary.Shipping + costsSummary.TotalTax;
return(costsSummary);
}
