static void Main(string[] args)
{
try
{
DateTime lastMonth = new DateTime(DateTime.Now.Year, DateTime.Now.Month - 1, 1);
Person firstPerson = new Person("FirstName1", "LastName1", "0123456789");
Person secondPerson = new Person("FirstName2", "LastName2", "1123456789");
Person thirdPerson = new Person("FirstName3", "LastName3", "2123456789");
DiscountCard firstPersonDiscountCard = new BronzeDiscountCard(firstPerson);
DiscountCard secondPersonDiscountCard = new SilverDiscountCard(secondPerson);
DiscountCard thirdPersonDiscountCard = new GoldDiscountCard(thirdPerson);
firstPersonDiscountCard.CreatePurchase(150);
if (firstPersonDiscountCard.LoadLastPurchase())
{
Console.WriteLine($"Purchase value: ${firstPersonDiscountCard.LastPrice():f2}");
Console.WriteLine($"Discount rate: {firstPersonDiscountCard.LastDiscountRatePercent():f1}%");
Console.WriteLine($"Discount: ${firstPersonDiscountCard.LastDiscount():f2}");
Console.WriteLine($"Total: ${firstPersonDiscountCard.LastFinalPrice():f2}");
Console.WriteLine();
}
// add $600 purchase to aquire bigger discount rate
secondPersonDiscountCard.AddPurchase(new Purchase(secondPerson, 600, 0, lastMonth));
Purchase secondPersonPurchase = secondPersonDiscountCard
.CreatePurchase(850);
secondPersonPurchase.PrintPurchase();
Console.WriteLine();
// add $1500 purchase to aquire bigger discount rate
thirdPersonDiscountCard.AddPurchase(new Purchase(thirdPerson, 1500, 0, lastMonth));
Purchase thirdPersonPurchase = thirdPersonDiscountCard
.CreatePurchase(1300);
thirdPersonPurchase.PrintPurchase();
Console.WriteLine();
// person with gold discount card and purchase of 1500 but more than a month ago => no additional discounts
Person fourthPerson = new Person("FirstName4", "LastName4", "3123456789");
DiscountCard fourthPersonDiscountCard = new GoldDiscountCard(fourthPerson);
fourthPersonDiscountCard.AddPurchase(new Purchase(fourthPerson, 1500, 0, new DateTime(1990, 01, 01)));
fourthPersonDiscountCard
.CreatePurchase(50)
.PrintPurchase(shouldPrintPersonDetails: true);
Console.WriteLine();
ExampleExceptionHandling();
Console.WriteLine("Examples completed successfully!");
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
private static void ExampleExceptionHandling(bool shouldPersonBeNull = true)
{
if (shouldPersonBeNull)
{
try
{
Person nullPerson = null;
DiscountCard discountCard = new GoldDiscountCard(nullPerson);
discountCard.CreatePurchase(-333);
if (discountCard.LoadLastPurchase())
{
Console.WriteLine($"{nullPerson.FirstName} {nullPerson.LastName} made a purchase of {discountCard.LastFinalPrice():f2} value!");
}
}
catch (ArgumentNullException exception)
{
// Example with nested exception handling
ExampleExceptionHandling(shouldPersonBeNull: false);
// Inner exception is handled and logged before this
Debug.WriteLine(exception.Message);
// delegating and masking exception trace
throw new Exception("Error happened. See logs!");
}
}
else
{
try
{
Person nullPerson = new Person("Null", "Person", "1234567890");
DiscountCard discountCard = new GoldDiscountCard(nullPerson);
discountCard.CreatePurchase(-333);
if (discountCard.LoadLastPurchase())
{
Console.WriteLine($"{nullPerson.FirstName} {nullPerson.LastName} made a purchase of {discountCard.LastFinalPrice():f2} value!");
}
}
catch (ArgumentException exception)
{
Debug.WriteLine(exception.Message);
}
}
}