Refactor UI logic to a new UserController

Author: izzat5233

Controller/UserController.cs

@@ -0,0 +1,92 @@
+using SimpleInventoryManagementSystem.Domain;
+using SimpleInventoryManagementSystem.Interfaces;
+
+namespace SimpleInventoryManagementSystem.Controller;
+
+public class UserController : IUserController
+{
+    private readonly IProductRepository _repository;
+    public UserController(IProductRepository repository) => _repository = repository;
+
+    public void AddProduct()
+    {
+        var product = EnterAndValidateProduct();
+        _repository.AddProduct(product);
+    }
+
+    public void FindAndDisplayProduct()
+    {
+        var product = FindProduct();
+        Console.WriteLine(product == null ? "Product not found!" : product);
+    }
+
+    public void FindAndEditProduct()
+    {
+        var product = FindProduct();
+        if (product == null)
+        {
+            Console.WriteLine("Product not found!");
+            return;
+        }
+
+        Console.WriteLine("Please enter new product information.");
+        var newProduct = EnterAndValidateProduct();
+        _repository.DeleteProductByName(product.Name);
+        _repository.AddProduct(newProduct);
+    }
+
+    public void FindAndDeleteProduct()
+    {
+        var product = FindProduct();
+        if (product == null)
+        {
+            Console.WriteLine("Product not found!");
+            return;
+        }
+
+        _repository.DeleteProductByName(product.Name);
+    }
+
+    public void DisplayProducts()
+    {
+        var number = 1;
+        foreach (var product in _repository.GetAllProducts())
+        {
+            Console.WriteLine($"[{number++}] {product}");
+        }
+    }
+
+    private Product? EnterProduct()
+    {
+        Console.WriteLine("Name:");
+        var name = Console.In.ReadLine() ?? string.Empty;
+        var valid = !string.IsNullOrEmpty(name);
+
+        Console.WriteLine("Price:");
+        valid &= int.TryParse(Console.In.ReadLine(), out var price);
+
+        Console.WriteLine("Quantity:");
+        valid &= int.TryParse(Console.In.ReadLine(), out var quantity);
+
+        return valid ? new Product(name, price, quantity) : null;
+    }
+
+    private Product EnterAndValidateProduct()
+    {
+        var product = EnterProduct();
+        while (product == null)
+        {
+            Console.WriteLine("Invalid information!");
+            product = EnterProduct();
+        }
+
+        return product;
+    }
+
+    private Product? FindProduct()
+    {
+        Console.WriteLine("Name:");
+        var name = Console.In.ReadLine() ?? string.Empty;
+        return string.IsNullOrEmpty(name) ? null : _repository.GetProductByName(name);
+    }
+}

Interfaces/IUserController.cs

@@ -0,0 +1,10 @@
+namespace SimpleInventoryManagementSystem.Interfaces;
+
+public interface IUserController
+{
+    void AddProduct();
+    void FindAndDisplayProduct();
+    void FindAndEditProduct();
+    void FindAndDeleteProduct();
+    void DisplayProducts();
+}

Program.cs

@@ -1,10 +1,9 @@
 // See https://aka.ms/new-console-template for more information
 
-using SimpleInventoryManagementSystem.Domain;
-using SimpleInventoryManagementSystem.Interfaces;
+using SimpleInventoryManagementSystem.Controller;
 using SimpleInventoryManagementSystem.Repository;
 
-IProductRepository inventory = new ProductRepository();
+var controller = new UserController(new ProductRepository());
 
 while (true)
 {
@@ -22,103 +21,21 @@ else. Exit
     switch (input)
     {
         case "1":
-            AddProduct();
+            controller.AddProduct();
             break;
         case "2":
-            DisplayProducts();
+            controller.DisplayProducts();
             break;
         case "3":
-            FindAndDisplayProduct();
+            controller.FindAndDisplayProduct();
             break;
         case "4":
-            FindAndEditProduct();
+            controller.FindAndEditProduct();
             break;
         case "5":
-            FindAndDeleteProduct();
+            controller.FindAndDeleteProduct();
             break;
         default:
             return 0;
     }
-}
-
-void AddProduct()
-{
-    var product = EnterAndValidateProduct();
-    inventory.AddProduct(product);
-}
-
-void FindAndDisplayProduct()
-{
-    var product = FindProduct();
-    Console.WriteLine(product == null ? "Product not found!" : product);
-}
-
-void FindAndEditProduct()
-{
-    var product = FindProduct();
-    if (product == null)
-    {
-        Console.WriteLine("Product not found!");
-        return;
-    }
-
-    Console.WriteLine("Please enter new product information.");
-    var newProduct = EnterAndValidateProduct();
-    inventory.DeleteProductByName(product.Name);
-    inventory.AddProduct(newProduct);
-}
-
-void FindAndDeleteProduct()
-{
-    var product = FindProduct();
-    if (product == null)
-    {
-        Console.WriteLine("Product not found!");
-        return;
-    }
-
-    inventory.DeleteProductByName(product.Name);
-}
-
-void DisplayProducts()
-{
-    var number = 1;
-    foreach (var product in inventory.GetAllProducts())
-    {
-        Console.WriteLine($"[{number++}] {product}");
-    }
-}
-
-Product? EnterProduct()
-{
-    Console.WriteLine("Name:");
-    var name = Console.In.ReadLine() ?? string.Empty;
-    var valid = !string.IsNullOrEmpty(name);
-
-    Console.WriteLine("Price:");
-    valid &= int.TryParse(Console.In.ReadLine(), out var price);
-
-    Console.WriteLine("Quantity:");
-    valid &= int.TryParse(Console.In.ReadLine(), out var quantity);
-
-    return valid ? new Product(name, price, quantity) : null;
-}
-
-Product EnterAndValidateProduct()
-{
-    var product = EnterProduct();
-    while (product == null)
-    {
-        Console.WriteLine("Invalid information!");
-        product = EnterProduct();
-    }
-
-    return product;
-}
-
-Product? FindProduct()
-{
-    Console.WriteLine("Name:");
-    var name = Console.In.ReadLine() ?? string.Empty;
-    return string.IsNullOrEmpty(name) ? null : inventory.GetProductByName(name);
 }