/// <summary>
/// Update a price of a product.
/// The price of the product will be update to new price that user enters.
/// </summary>
/// <param name="numberOfCatalogues">The number of catalogues created.</param>
private static void UpdatePrice(ref int numberOfCatalogues)
{
if (numberOfCatalogues == 0)
{
Console.WriteLine("No catalogues exist. Please create a catalogue first.");
return;
}
ProductCatalogue cata = SelectCatalogue(numberOfCatalogues);
// Show all products in the catalogue and products in it.
ShowProductNamesAndPrice(cata);
if (cata.NumberOfProducts == 0)
{
return;
}
int index = SelectProduct(cata.NumberOfProducts);
//show a product that a user selected
ProductData data = cata.GetProduct(index - 1);
Console.Write("You have selected {0}.", data.ProductName);
Console.WriteLine("The current retail price is {0:c2}.", data.RetailPrice);
//update the price
data.RetailPrice = InputHelper.GetPositiveDoubleFromUser("Please enter the new price: ");
Console.WriteLine();
}
/// <summary>
/// Select catalogue.
/// User selects existing catalogues.
/// </summary>
/// <param name="numberOfCatalogues">The number of catalogues created.</param>
/// <returns>ProductCatalogue object.</returns>
private static ProductCatalogue SelectCatalogue(int numberOfCatalogues)
{
ShowAllCatalogueNames(numberOfCatalogues);
int index = InputHelper.GetIntFromUser(
"Please choose the catalogues: ", MIN_INDEX_NUM, numberOfCatalogues);
ProductCatalogue ret = Catalogues[index - 1];
return(ret);
}
/// <summary>
/// Show all products in the catalog.
/// </summary>
/// <param name="cata">Product catalog.</param>
private static void ShowProductNamesAndPrice(ProductCatalogue cata)
{
if (cata == null || cata.NumberOfProducts == 0)
{
Console.WriteLine("No products exist.");
return;
}
for (int i = 0; i < cata.NumberOfProducts; i++)
{
ProductData data = cata.GetProduct(i);
//product number starts from 1, thus "+1"
Console.WriteLine("{0}. {1}: {2:c2}", (i + 1), data.ProductName, data.RetailPrice);
}
}
/// <summary>
/// Create a new catalogue.
/// If the number of catalogue is as same as MAX_NUM_CATALOGUES, the method shows an error message.
/// </summary>
/// <param name="numberOfCatalogues">The number of catalogues created.</param>
private static void CreateCatalogue(ref int numberOfCatalogues)
{
//check existance of any catalogues
if (numberOfCatalogues == MAX_NUM_CATALOGUES)
{
Console.WriteLine("Catalogue list is full.");
return;
}
string name = InputHelper.GetStringFromUser("Please enter a new catalogue name: ");
ProductCatalogue cata = new ProductCatalogue(name);
Catalogues[numberOfCatalogues] = cata;
numberOfCatalogues++;
}
/// <summary>
/// Show average price per catalogue.
/// Price is not displayed if there are no products.
/// </summary>
/// <param name="numberOfCatalogues">The number of catalogues created.</param>
private static void ShowAvgPricePerCatalogue(int numberOfCatalogues)
{
if (numberOfCatalogues == 0)
{
Console.WriteLine("No catalogues exist. Please create a catalogue first.");
return;
}
//loop to show all catalogues' average price
for (int i = 0; i < numberOfCatalogues; i++)
{
ProductCatalogue cata = Catalogues[i];
Console.Write("You have {0} products in {1}. ", cata.NumberOfProducts, cata.CatalogueName);
if (cata.NumberOfProducts > 0)
{
double avgPrice = cata.GetAvgPrice();
Console.WriteLine("The average retail price is: {0:c2}.", avgPrice);
}
else
{
Console.WriteLine("");
}
}
}
/// <summary>
/// Add product and its price.
/// The method ask to enter a product name and its price respectively,
/// then stores them in a catalogue previously selected by the user.
/// </summary>
/// <param name="numberOfCatalogues">The number of catalogues created.</param>
private static void AddProductAndPrice(ref int numberOfCatalogues)
{
if (numberOfCatalogues == 0)
{
Console.WriteLine("No catalogues exist. Please create a catalogue first.");
return;
}
ProductCatalogue cata = SelectCatalogue(numberOfCatalogues);
Console.WriteLine("You have chosen {0}.", cata.CatalogueName);
//Check the number of products in the catalogue.
if (cata.NumberOfProducts == ProductCatalogue.MAX_NUM_PRODUCTS)
{
Console.WriteLine("Cannot add a product. The catalog is full. ");
return;
}
string name = InputHelper.GetStringFromUser("Enter the name of a new product in your catalogue: ");
double price = InputHelper.GetPositiveDoubleFromUser(string.Format("Enter the retail price of {0}: ", name));
cata.InsertProduct(new ProductData(name, price));
Console.WriteLine();
}
