//Loading products from CSV and storing them to LIST
public static List <Product> LoadProductList(string filename)
{
if (string.IsNullOrWhiteSpace(filename))
{
throw new ArgumentNullException(nameof(filename));
}
var fileRows = File.ReadAllLines(filename);
foreach (var s in fileRows)
{
if (string.IsNullOrWhiteSpace(s))
{
throw new ArgumentNullException(nameof(s));
}
}
List <Product> ListOfProducts = new List <Product>();
for (var i = 0; i < fileRows.Length; i++)
{
var rowSplit = fileRows[i].Split(';');
ListOfProducts.Add(new Product(rowSplit[0], rowSplit[1]));
}
ListOfProducts = ListOfProducts.Distinct(new ProductComparer()).ToList();
PrintingMessages.PrintMsg("PRODUCT LIST");
for (var i = 0; i < ListOfProducts.Count; i++)
{
Console.WriteLine($" ID: {ListOfProducts[i].ProductId}, Price: {ListOfProducts[i].ProductPrice} Euros ");
}
return(ListOfProducts);
}
//Get a list of products and select "num " of them and and return them as newList
public static List <Product> MakeRandomList(List <Product> list1, int num)
{
if (list1 == null)
{
throw new ArgumentNullException("The list parameter is null");
}
if (num < 0 || num > list1.Count())
{
throw new ArgumentException("The num you provided is either greater than list's size or negative");
}
Random randomItem = new Random();
var newList = new List <Product>();
PrintingMessages.PrintMsg("CUSTOMERS'S LIST");
for (var i = 0; i < num; i++)
{
newList.Add(list1[randomItem.Next(0, list1.Count)]);
Console.WriteLine($"The product {newList[i].ProductId} costs {newList[i].ProductPrice} Euros");
}
return(newList);
}
//Printing 10 most popular products
public static void FindPopularProducts(List <Product> list1, List <Product> list2, int num)
{
if (list1 == null)
{
throw new ArgumentNullException($" The {list1} parameter is null ");
}
if (list2 == null)
{
throw new ArgumentNullException($" The {list2} parameter is null ");
}
var newList = new List <Product>();
newList = list1.Concat(list2).ToList();
PrintingMessages.PrintMsg(" PRODUCTS FROM EVERY ORDER ");
for (var i = 0; i < newList.Count; i++)
{
Console.WriteLine($" {newList[i].ProductId}");
}
var popularList = (newList.GroupBy(p => p.ProductId).OrderByDescending(grp => grp.Count())).ToList();
PrintingMessages.PrintMsg(" POPULAR PRODUCTS ");
for (var i = 0; i < num; i++)
{
Console.WriteLine($" {popularList[i].Key}");
}
}
//Finds the best customer comparing the total costs from every order
public static void BestCustomer(Customer customer1, Customer customer2)
{
PrintingMessages.PrintMsg("BEST CUSTOMER");
if (customer1 == customer2)
{
Console.WriteLine($"{customer1} and {customer2} spent the same amount");
}
else if (customer1 < customer2)
{
Console.WriteLine($"{customer2.LastName} spent {customer2.FinalCost} Euros");
}
else
{
Console.WriteLine($"{customer1.LastName} spent {customer1.FinalCost} Euros");
}
}
public Order(List <Product> productList)
{
if (productList == null)
{
throw new ArgumentNullException("The list parameter is null");
}
TotalAmount = 0;
Products = new List <Product>(productList);
for (var i = 0; i < Products.Count; i++)
{
TotalAmount = TotalAmount + Products[i].ProductPrice;
}
PrintingMessages.PrintMsg("The cost of the order is:");
Console.WriteLine($"{TotalAmount} Euros");
}