WHQ7HJ - Éttermi rendeléskezelő

WHQ7HJ/WHQ7HJ.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.12.35514.174 d17.12
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WHQ7HJ", "WHQ7HJ\WHQ7HJ.csproj", "{FA2AA53F-5B1C-4B82-8499-D1F2973F734C}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{FA2AA53F-5B1C-4B82-8499-D1F2973F734C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{FA2AA53F-5B1C-4B82-8499-D1F2973F734C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{FA2AA53F-5B1C-4B82-8499-D1F2973F734C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{FA2AA53F-5B1C-4B82-8499-D1F2973F734C}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

WHQ7HJ/WHQ7HJ/MenuItem.cs

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+namespace WHQ7HJ
+{
+    public record MenuItem(string Name, int Price);
+
+}

WHQ7HJ/WHQ7HJ/MenuService.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Text.Json;
+using System.Threading.Tasks;
+
+namespace WHQ7HJ
+{
+    internal class MenuService
+    {
+        private readonly string _filePath = "..\\..\\..\\menu.json";
+
+
+        public List<MenuItem> LoadMenu()
+        {
+            try
+            {
+                string json = File.ReadAllText(_filePath);
+                return JsonSerializer.Deserialize<List<MenuItem>>(json) ?? new List<MenuItem>();
+            }
+            catch(FileNotFoundException ex)
+            {
+                Console.WriteLine(ex.Message);
+                Environment.Exit(1);
+                return [];
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine(ex.Message);
+                Environment.Exit(1);
+                return [];
+            }
+
+
+        }
+
+        public void DisplayMenu(List<MenuItem> menu)
+        {
+            Console.WriteLine("");
+            Console.WriteLine("Menu");
+            Console.WriteLine("-----");
+            foreach (var item in menu)
+            {
+                Console.WriteLine($"{item.Name} - {item.Price:C}");
+            }
+        }
+
+
+    }
+}

WHQ7HJ/WHQ7HJ/Order.cs

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+namespace WHQ7HJ
+{
+    public record Order(string CustomerName, string OrderDate, List<MenuItem> MenuItems);
+
+}

WHQ7HJ/WHQ7HJ/OrderService.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Text.Json;
+using System.Threading.Tasks;
+
+namespace WHQ7HJ
+{
+    internal class OrderService
+    {
+
+        private readonly string _filePath = "..\\..\\..\\orders.json";
+
+
+        public List<Order> LoadOrders()
+        {
+            try
+            {
+                string json = File.ReadAllText(_filePath);
+                return JsonSerializer.Deserialize<List<Order>>(json) ?? new List<Order>();
+            }
+            catch (FileNotFoundException ex)
+            {
+                Console.WriteLine(ex.Message);
+                return new List<Order>();
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine(ex.Message);
+                return new List<Order>();
+            }
+
+        }
+
+        public Order CreateOrder(List<MenuItem> menu)
+        {
+            Console.Write("Enter your name: ");
+            string customerName = Console.ReadLine();
+            if (string.IsNullOrEmpty(customerName)){ customerName = "Anonymous customer"; }
+
+            string orderdate = DateTime.Today.ToString("dd/MM/yyyy");
+
+            var orderItems = new List<MenuItem>();
+
+            while (true)
+            {
+                Console.Clear();
+
+                Console.WriteLine("Enter the name of the chosen dish (or 'OK' to finish): ");
+                string input = Console.ReadLine();
+
+                if (input?.ToLower() == "ok")
+                {
+                    break;
+                }
+
+                var menuItem = menu.FirstOrDefault(item => item.Name.Equals(input, StringComparison.OrdinalIgnoreCase));
+
+                if (menuItem != null)
+                {
+                    orderItems.Add(menuItem);
+                    Console.WriteLine($"{menuItem.Name} added to the order.");
+                }
+                else
+                {
+                    Console.WriteLine("There is no such dish on the menu!");
+                }
+
+                Console.WriteLine("Press any key to continue...");
+                Console.ReadKey();
+            }
+
+            return new Order(customerName, orderdate, orderItems);
+        }
+
+        public void SaveOrders(List<Order> orders)
+        {
+            try
+            {
+                string json = JsonSerializer.Serialize(orders, new JsonSerializerOptions { WriteIndented = true });
+                File.WriteAllText(_filePath, json);
+            }
+            catch(IOException ex)
+            {
+                Console.WriteLine(ex.Message);
+                Environment.Exit(1);
+            }
+            catch(Exception ex)
+            {
+                Console.WriteLine(ex.Message);
+                Environment.Exit(1);
+            }
+        }
+
+        public void DisplayOrders(List<Order> orders)
+        {
+            Console.WriteLine("");
+            Console.WriteLine("Orders");
+            Console.WriteLine("-----");
+            if(orders.Count == 0)
+            {
+                Console.WriteLine("No order has been received yet.");
+            }
+            else
+            {
+                foreach (var order in orders)
+                {
+                    Console.WriteLine($"Name: {order.CustomerName}, Date: {order.OrderDate}, Order: {string.Join(", ", order.MenuItems.Select(item => item.Name))}");
+                }
+            }
+        }
+
+        public void DisplayPopularItems(List<Order> orders)
+        {
+           if(orders.Count == 0)
+            {
+                Console.WriteLine("No order has been received yet.");
+            }
+            else
+            {
+                var popularItems = orders.SelectMany(order => order.MenuItems)
+                                     .GroupBy(item => item.Name)
+                                     .OrderByDescending(group => group.Count())
+                                     .Select(group => new { Item = group.Key, Count = group.Count() });
+
+                Console.WriteLine("Popular dishes");
+                Console.WriteLine("--------------");
+                foreach (var item in popularItems)
+                {
+                    Console.WriteLine($"{item.Item}: {item.Count} orders");
+                }
+            }
+        }
+
+        public void CalculateTotal(List<Order> orders)
+        {
+            Console.WriteLine($"Total revenue: {orders.Sum(order => order.MenuItems.Sum(item => item.Price))} Ft.");
+        }
+
+
+    }
+}

WHQ7HJ/WHQ7HJ/Program.cs

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+using WHQ7HJ;
+
+var menuService = new MenuService();
+var orderService = new OrderService();
+
+var menu = menuService.LoadMenu();
+var orders = orderService.LoadOrders();
+
+while (true)
+{
+    Console.Clear();
+    Console.WriteLine("1. View menu");
+    Console.WriteLine("2. Place an order");
+    Console.WriteLine("3. View orders");
+    Console.WriteLine("4. Summary of orders");
+    Console.WriteLine("5. Exit");
+
+    Console.Write("Choose an option: ");
+    string choice = Console.ReadLine();
+
+    switch (choice)
+    {
+        case "1":
+            menuService.DisplayMenu(menu);
+            break;
+        case "2":
+            Order order = orderService.CreateOrder(menu);
+            orders.Add(order);
+            orderService.SaveOrders(orders);
+            Console.WriteLine("Order recorded!");
+            break;
+        case "3":
+            orderService.DisplayOrders(orders);           
+            break;
+        case "4":
+            orderService.CalculateTotal(orders);
+            orderService.DisplayPopularItems(orders);
+            break;
+        case "5":
+            return;
+        default:
+            Console.WriteLine("Invalid choice!");
+            break;
+    }
+
+    Console.WriteLine("Press any key to continue...");
+    Console.ReadKey();
+}

WHQ7HJ/WHQ7HJ/WHQ7HJ.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

WHQ7HJ/WHQ7HJ/menu.json

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+[
+  {
+    "Name": "Fried cheese",
+    "Price": 1990
+  },
+  {
+    "Name": "Forest fruit soup",
+    "Price": 880
+  },
+  {
+    "Name": "Bolognese pork chops",
+    "Price": 2940
+  },
+  {
+    "Name": "Bean goulash soup",
+    "Price": 1490
+  },
+  {
+    "Name": "Beef stew",
+    "Price": 2350
+  },
+  {
+    "Name": "Spaghetti carbonara",
+    "Price": 1990
+  },
+  {
+    "Name": "Fried catfish fillet",
+    "Price": 2740
+  },
+  {
+    "Name": "Cabbage salad",
+    "Price": 650
+  },
+  {
+    "Name": "Gundel pancakes",
+    "Price": 450
+  }
+]