Add skeleton of project for C# code interview

Author: deadwards90

.gitignore

@@ -348,3 +348,6 @@ MigrationBackup/
 
 # Ionide (cross platform F# VS Code tools) working folder
 .ionide/
+
+# intellij configs
+.idea/

WealthKernel.ShoppingCart.sln

@@ -0,0 +1,16 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WealthKernel.ShoppingCart", "src\WealthKernel.ShoppingCart.csproj", "{8419B160-5AF8-4F58-ADCC-46A7342B86A3}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{8419B160-5AF8-4F58-ADCC-46A7342B86A3}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8419B160-5AF8-4F58-ADCC-46A7342B86A3}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8419B160-5AF8-4F58-ADCC-46A7342B86A3}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8419B160-5AF8-4F58-ADCC-46A7342B86A3}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

src/Bus/Command.cs

@@ -0,0 +1,6 @@
+using MediatR;
+
+namespace WealthKernel.ShoppingCart.Bus
+{
+    public class Command : INotification {}
+}

src/Bus/CommandHandler.cs

@@ -0,0 +1,8 @@
+using MediatR;
+
+namespace WealthKernel.ShoppingCart.Bus
+{
+    public interface ICommandHandler<in T> : INotificationHandler<T> where T : INotification
+    {
+    }
+}

src/Bus/ExampleCommand.cs

@@ -0,0 +1,25 @@
+using System.Threading;
+using System.Threading.Tasks;
+using MediatR;
+
+namespace WealthKernel.ShoppingCart.Bus
+{
+    /// <summary>
+    /// To use the command, you just need to inherit from Command
+    /// and then you can create an ICommandHandler to do something with it
+    /// </summary>
+    public class ExampleCommand : Command
+    {
+        
+    }
+    
+    public class ExampleCommandHandler : ICommandHandler<ExampleCommand>
+    {
+        public Task Handle(ExampleCommand notification, CancellationToken cancellationToken)
+        {
+            // Do something here!
+            
+            return Task.CompletedTask;
+        }
+    }
+}

src/Bus/SimpleBus.cs

@@ -0,0 +1,20 @@
+using System.Threading.Tasks;
+using MediatR;
+
+namespace WealthKernel.ShoppingCart.Bus
+{
+    public class SimpleBus
+    {
+        private readonly IMediator _mediator;
+
+        public SimpleBus(IMediator mediator)
+        {
+            _mediator = mediator;
+        }
+        
+        public async Task Send(Command command)
+        {
+            await _mediator.Publish(command);
+        }
+    }
+}

src/Data/ShoppingCartRepository.cs

@@ -0,0 +1,51 @@
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Linq;
+using WealthKernel.ShoppingCart.Models;
+
+namespace WealthKernel.ShoppingCart.Data
+{
+    public class ShoppingCartRepository
+    {
+        private readonly ConcurrentDictionary<string,CartItem> _items;
+
+        public ShoppingCartRepository()
+        {
+            _items = new ConcurrentDictionary<string, CartItem>();
+        } 
+            
+        public void AddItem(CartItem item)
+        {
+            var added = _items.TryAdd(item.Id, item);
+            
+            if (!added)
+            {
+                throw new InvalidOperationException($"Item {item.Id} already exists!");
+            }
+        }
+
+        public CartItem? GetItem(string id)
+        {
+            _items.TryGetValue(id, out var item);
+            return item;
+        }
+
+        public IList<CartItem> SearchItems(string? id, string? name)
+        {
+            var itemsQueryable = _items.Values.AsQueryable();
+
+            if (!string.IsNullOrEmpty(id))
+            {
+                return new[] { itemsQueryable.Single(item => item.Id == id) };
+            }
+
+            if (!string.IsNullOrEmpty(name))
+            {
+                itemsQueryable = itemsQueryable.Where(r => r.Name == name);
+            }
+
+            return itemsQueryable.ToArray();
+        }
+    }
+}

src/Models/CartItem.cs

@@ -0,0 +1,9 @@
+namespace WealthKernel.ShoppingCart.Models
+{
+    public class CartItem
+    {
+        public string Id { get; set; }
+        
+        public string Name { get; set; }
+    }
+}

src/Program.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+
+namespace WealthKernel.ShoppingCart
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            CreateHostBuilder(args).Build().Run();
+        }
+
+        public static IHostBuilder CreateHostBuilder(string[] args) =>
+            Host.CreateDefaultBuilder(args)
+                .ConfigureWebHostDefaults(webBuilder => { webBuilder.UseStartup<Startup>(); });
+    }
+}

src/Properties/launchSettings.json

@@ -0,0 +1,12 @@
+{
+  "profiles": {
+    "WealthKernel.ShoppingCart": {
+      "commandName": "Project",
+      "launchBrowser": true,
+      "applicationUrl": "https://localhost:33333;http://localhost:22222",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}