Task 1 completed

.gitignore

@@ -7,6 +7,7 @@
 *.rsuser
 *.suo
 *.user
+*.idea
 *.userosscache
 *.sln.docstates
 

UndoAssessment/UndoAssessment.Android/MainActivity.cs

@@ -1,5 +1,5 @@
 using System;
-
+using Acr.UserDialogs;
 using Android.App;
 using Android.Content.PM;
 using Android.Runtime;
@@ -16,6 +16,7 @@ protected override void OnCreate(Bundle savedInstanceState)
 
             Xamarin.Essentials.Platform.Init(this, savedInstanceState);
             global::Xamarin.Forms.Forms.Init(this, savedInstanceState);
+            UserDialogs.Init(this);
             LoadApplication(new App());
         }
         public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)

UndoAssessment/UndoAssessment/App.xaml.cs

@@ -2,6 +2,9 @@
 using Xamarin.Forms;
 using Xamarin.Forms.Xaml;
 using UndoAssessment.Services;
+using UndoAssessment.Services.Api;
+using UndoAssessment.Services.Dialogs;
+using UndoAssessment.Services.Storage;
 using UndoAssessment.Views;
 
 namespace UndoAssessment
@@ -14,6 +17,8 @@ public App ()
             InitializeComponent();
 
             DependencyService.Register<MockDataStore>();
+            DependencyService.Register<TaskApiService>();
+            DependencyService.Register<UserDialogsService>();
             MainPage = new AppShell();
         }
 

UndoAssessment/UndoAssessment/AppShell.xaml

@@ -32,6 +32,7 @@
     <TabBar>
         <ShellContent Title="About" Icon="icon_about.png" Route="AboutPage" ContentTemplate="{DataTemplate local:AboutPage}" />
         <ShellContent Title="Browse" Icon="icon_feed.png" ContentTemplate="{DataTemplate local:ItemsPage}" />
+        <ShellContent Title="Task" Icon="icon_feed.png" ContentTemplate="{DataTemplate local:TaskPage}" />
     </TabBar>
 
     <!--

UndoAssessment/UndoAssessment/AppShell.xaml.cs

@@ -1,7 +1,4 @@
-using System;
-using System.Collections.Generic;
-using UndoAssessment.ViewModels;
-using UndoAssessment.Views;
+using UndoAssessment.Views;
 using Xamarin.Forms;
 
 namespace UndoAssessment
@@ -13,6 +10,7 @@ public AppShell()
             InitializeComponent();
             Routing.RegisterRoute(nameof(ItemDetailPage), typeof(ItemDetailPage));
             Routing.RegisterRoute(nameof(NewItemPage), typeof(NewItemPage));
+            Routing.RegisterRoute(nameof(UserDataFormPage), typeof(UserDataFormPage));
         }
 
     }

UndoAssessment/UndoAssessment/Extensions/HttpExtensions.cs

@@ -0,0 +1,30 @@
+using System.Net.Http;
+using System.Text;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Converters;
+
+namespace UndoAssessment.Extensions
+{
+    public static class HttpExtensions
+    {
+        public static HttpRequestBuilder CreateRequest(this HttpClient client)
+            => new HttpRequestBuilder(client);
+
+        public static HttpContent ToHttpContent(this object requestBody)
+        {
+            var result = default(HttpContent);
+
+            if (requestBody is HttpContent content)
+            {
+                result = content;
+            }
+            else
+            {
+                var jsonString = JsonConvert.SerializeObject(requestBody ?? new object(), new IsoDateTimeConverter());
+                result = new StringContent(jsonString, Encoding.UTF8, "application/json");
+            }
+
+            return result;
+        }
+    }
+}

UndoAssessment/UndoAssessment/Extensions/HttpRequestBuilder.cs

@@ -0,0 +1,63 @@
+using System;
+using System.Diagnostics;
+using System.Net.Http;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace UndoAssessment.Extensions
+{
+    public class HttpRequestBuilder
+    {
+        private readonly HttpClient _client;
+
+        private HttpRequestMessage _buildingRequest;
+        private CancellationToken _cancellationToken;
+
+        public HttpRequestBuilder(HttpClient client)
+        {
+            _client = client;
+
+            _buildingRequest = new HttpRequestMessage();
+        }
+
+        public HttpRequestBuilder ByResource(string address, string resource, params object[] parameters)
+        {
+            var url = address + string.Format(resource, parameters);
+            _buildingRequest.RequestUri = new Uri(url);
+            return this;
+        }
+
+        public HttpRequestBuilder WithMethod(HttpMethod method)
+        {
+            _buildingRequest.Method = method;
+            return this;
+        }
+
+        public HttpRequestBuilder WithContent(object content)
+        {
+            _buildingRequest.Content = content.ToHttpContent();
+            return this;
+        }
+
+        public HttpRequestBuilder WithHeader(string type, string val)
+        {
+            _buildingRequest.Headers.Add(type, val);
+            return this;
+        }
+
+        public async Task<HttpResponseMessage> MakeRequestAsync()
+        {
+            try
+            {
+                return await _client.SendAsync(_buildingRequest, _cancellationToken);
+            }
+            catch (Exception e)
+            {
+                if (Debugger.IsAttached)
+                    Debugger.Break();
+                Console.WriteLine(e);
+                throw;
+            }
+        }
+    }
+}

UndoAssessment/UndoAssessment/Extensions/HttpResponseMessageExtensions.cs

@@ -0,0 +1,17 @@
+using System.Net.Http;
+using System.Threading.Tasks;
+
+namespace UndoAssessment.Extensions
+{
+    public static class HttpResponseMessageExtensions
+    {
+        public static async Task<T> ReadContentAsJsonAsync<T>(this Task<HttpResponseMessage> taskMessage)
+            => await (await taskMessage).ReadContentAsJsonAsync<T>();
+
+        public static async Task<T> ReadContentAsJsonAsync<T>(this HttpResponseMessage message)
+            => (await message.ReadAsStringAsync()).ParseAsJson<T>();
+
+        public static Task<string> ReadAsStringAsync(this HttpResponseMessage message)
+            => message.Content.ReadAsStringAsync();
+    }
+}

UndoAssessment/UndoAssessment/Extensions/StringExtensions.cs

@@ -0,0 +1,11 @@
+using Newtonsoft.Json;
+using Newtonsoft.Json.Converters;
+
+namespace UndoAssessment.Extensions
+{
+    public static class StringExtensions
+    {
+        public static T ParseAsJson<T>(this string str)
+            => JsonConvert.DeserializeObject<T>(str, converters: new JsonConverter[] { new IsoDateTimeConverter() });
+    }
+}

UndoAssessment/UndoAssessment/Models/ApiResponse.cs

@@ -0,0 +1,21 @@
+using System;
+
+namespace UndoAssessment.Models
+{
+    public class ApiResponse
+    {
+        public string Message { get; set; }
+        public DateTime Date { get; set; }
+        public int ErrorCode { get; set; }
+
+        public override string ToString()
+        {
+            var errorLine = ErrorCode > 0 ? $"ErrorCode: {ErrorCode}" : "";
+            return
+                $"Message: {Message}\n" +
+                $"Date: {Date.ToString()}\n" +
+                errorLine;
+
+        }
+    }
+}

UndoAssessment/UndoAssessment/Models/UserData.cs

@@ -0,0 +1,8 @@
+namespace UndoAssessment.Models
+{
+    public class UserData
+    {
+        public string Name { get; set; }
+        public int Age { get; set; }
+    }
+}

UndoAssessment/UndoAssessment/Services/Api/IApiService.cs

@@ -0,0 +1,11 @@
+using System.Threading.Tasks;
+using UndoAssessment.Models;
+
+namespace UndoAssessment.Services.Api
+{
+    public interface IApiService
+    {
+        Task<ApiResponse> SuccessAsync();
+        Task<ApiResponse> ErrorAsync();
+    }
+}

UndoAssessment/UndoAssessment/Services/Api/TaskApiService.cs

@@ -0,0 +1,35 @@
+using System.Net.Http;
+using System.Threading.Tasks;
+using UndoAssessment.Extensions;
+using UndoAssessment.Models;
+
+namespace UndoAssessment.Services.Api
+{
+    public class TaskApiService : IApiService
+    {
+        private const string ApiEndpoint = "https://malkarakundostagingpublicapi.azurewebsites.net";
+
+        private readonly HttpClient _client;
+
+        public TaskApiService()
+        {
+            _client = new HttpClient();
+        }
+
+        public Task<ApiResponse> SuccessAsync()
+            => _client
+                .CreateRequest()
+                .ByResource(ApiEndpoint, "/success")
+                .WithMethod(HttpMethod.Get)
+                .MakeRequestAsync()
+                .ReadContentAsJsonAsync<ApiResponse>();
+
+        public Task<ApiResponse> ErrorAsync()
+            => _client
+                .CreateRequest()
+                .ByResource(ApiEndpoint, "/fail")
+                .WithMethod(HttpMethod.Get)
+                .MakeRequestAsync()
+                .ReadContentAsJsonAsync<ApiResponse>();
+    }
+}

UndoAssessment/UndoAssessment/Services/Dialogs/IDialogsService.cs

@@ -0,0 +1,9 @@
+using System.Threading.Tasks;
+
+namespace UndoAssessment.Services.Dialogs
+{
+    public interface IDialogsService
+    {
+        Task AlertAsync(string title, string message);
+    }
+}

UndoAssessment/UndoAssessment/Services/Dialogs/UserDialogsService.cs

@@ -0,0 +1,20 @@
+using System.Threading.Tasks;
+using Acr.UserDialogs;
+
+namespace UndoAssessment.Services.Dialogs
+{
+    public class UserDialogsService : IDialogsService
+    {
+        private readonly IUserDialogs _userDialogs;
+
+        public UserDialogsService()
+        {
+            _userDialogs = UserDialogs.Instance;
+        }
+
+        public Task AlertAsync(string title, string message)
+        {
+            return _userDialogs.AlertAsync(message, title);
+        }
+    }
+}

UndoAssessment/UndoAssessment/Services/IDataStore.cs → UndoAssessment/UndoAssessment/Services/Storage/IDataStore.cs

@@ -1,8 +1,7 @@
-using System;
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Threading.Tasks;
 
-namespace UndoAssessment.Services
+namespace UndoAssessment.Services.Storage
 {
     public interface IDataStore<T>
     {

UndoAssessment/UndoAssessment/Services/MockDataStore.cs → UndoAssessment/UndoAssessment/Services/Storage/MockDataStore.cs

@@ -4,7 +4,7 @@
 using System.Threading.Tasks;
 using UndoAssessment.Models;
 
-namespace UndoAssessment.Services
+namespace UndoAssessment.Services.Storage
 {
     public class MockDataStore : IDataStore<Item>
     {

UndoAssessment/UndoAssessment/UndoAssessment.csproj

@@ -6,6 +6,8 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="Acr.UserDialogs" Version="7.2.0.564" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageReference Include="Xamarin.Forms" Version="5.0.0.2578" />  
     <PackageReference Include="Xamarin.Essentials" Version="1.7.6" />
   </ItemGroup>

UndoAssessment/UndoAssessment/ViewModels/BaseViewModel.cs

@@ -7,6 +7,7 @@
 
 using UndoAssessment.Models;
 using UndoAssessment.Services;
+using UndoAssessment.Services.Storage;
 
 namespace UndoAssessment.ViewModels
 {