Compleated Test Task 1

UndoAssessment.sln

@@ -1,60 +1,61 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio Version 16
-VisualStudioVersion = 25.0.1705.6
+# Visual Studio Version 17
+VisualStudioVersion = 17.4.33213.308
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "UndoAssessment.Android", "UndoAssessment\UndoAssessment.Android\UndoAssessment.Android.csproj", "{B08F8340-7FAF-4AB2-A9DA-BA5B14FE5FDE}"
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "UndoAssessment.iOS", "UndoAssessment\UndoAssessment.iOS\UndoAssessment.iOS.csproj", "{4F77CCCB-68DC-4CC7-A528-DB6FF48741D0}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "UndoAssessment", "UndoAssessment\UndoAssessment\UndoAssessment.csproj", "{7ED4972A-D279-4E63-B4F5-3D15590D4AA1}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "UndoAssessment", "UndoAssessment\UndoAssessment\UndoAssessment.csproj", "{7ED4972A-D279-4E63-B4F5-3D15590D4AA1}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
-		Release|Any CPU = Release|Any CPU
-		Debug|iPhoneSimulator = Debug|iPhoneSimulator
-		Release|iPhoneSimulator = Release|iPhoneSimulator
 		Debug|iPhone = Debug|iPhone
+		Debug|iPhoneSimulator = Debug|iPhoneSimulator
+		Release|Any CPU = Release|Any CPU
 		Release|iPhone = Release|iPhone
+		Release|iPhoneSimulator = Release|iPhoneSimulator
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
 		{B08F8340-7FAF-4AB2-A9DA-BA5B14FE5FDE}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{B08F8340-7FAF-4AB2-A9DA-BA5B14FE5FDE}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{B08F8340-7FAF-4AB2-A9DA-BA5B14FE5FDE}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{B08F8340-7FAF-4AB2-A9DA-BA5B14FE5FDE}.Release|Any CPU.Build.0 = Release|Any CPU
-		{B08F8340-7FAF-4AB2-A9DA-BA5B14FE5FDE}.Debug|iPhoneSimulator.ActiveCfg = Debug|Any CPU
-		{B08F8340-7FAF-4AB2-A9DA-BA5B14FE5FDE}.Debug|iPhoneSimulator.Build.0 = Debug|Any CPU
-		{B08F8340-7FAF-4AB2-A9DA-BA5B14FE5FDE}.Release|iPhoneSimulator.ActiveCfg = Release|Any CPU
-		{B08F8340-7FAF-4AB2-A9DA-BA5B14FE5FDE}.Release|iPhoneSimulator.Build.0 = Release|Any CPU
+		{B08F8340-7FAF-4AB2-A9DA-BA5B14FE5FDE}.Debug|Any CPU.Deploy.0 = Debug|Any CPU
 		{B08F8340-7FAF-4AB2-A9DA-BA5B14FE5FDE}.Debug|iPhone.ActiveCfg = Debug|Any CPU
 		{B08F8340-7FAF-4AB2-A9DA-BA5B14FE5FDE}.Debug|iPhone.Build.0 = Debug|Any CPU
+		{B08F8340-7FAF-4AB2-A9DA-BA5B14FE5FDE}.Debug|iPhoneSimulator.ActiveCfg = Debug|Any CPU
+		{B08F8340-7FAF-4AB2-A9DA-BA5B14FE5FDE}.Debug|iPhoneSimulator.Build.0 = Debug|Any CPU
+		{B08F8340-7FAF-4AB2-A9DA-BA5B14FE5FDE}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B08F8340-7FAF-4AB2-A9DA-BA5B14FE5FDE}.Release|Any CPU.Build.0 = Release|Any CPU
 		{B08F8340-7FAF-4AB2-A9DA-BA5B14FE5FDE}.Release|iPhone.ActiveCfg = Release|Any CPU
 		{B08F8340-7FAF-4AB2-A9DA-BA5B14FE5FDE}.Release|iPhone.Build.0 = Release|Any CPU
+		{B08F8340-7FAF-4AB2-A9DA-BA5B14FE5FDE}.Release|iPhoneSimulator.ActiveCfg = Release|Any CPU
+		{B08F8340-7FAF-4AB2-A9DA-BA5B14FE5FDE}.Release|iPhoneSimulator.Build.0 = Release|Any CPU
 		{4F77CCCB-68DC-4CC7-A528-DB6FF48741D0}.Debug|Any CPU.ActiveCfg = Debug|iPhoneSimulator
 		{4F77CCCB-68DC-4CC7-A528-DB6FF48741D0}.Debug|Any CPU.Build.0 = Debug|iPhoneSimulator
-		{4F77CCCB-68DC-4CC7-A528-DB6FF48741D0}.Release|Any CPU.ActiveCfg = Release|iPhoneSimulator
-		{4F77CCCB-68DC-4CC7-A528-DB6FF48741D0}.Release|Any CPU.Build.0 = Release|iPhoneSimulator
-		{4F77CCCB-68DC-4CC7-A528-DB6FF48741D0}.Debug|iPhoneSimulator.ActiveCfg = Debug|iPhoneSimulator
-		{4F77CCCB-68DC-4CC7-A528-DB6FF48741D0}.Debug|iPhoneSimulator.Build.0 = Debug|iPhoneSimulator
-		{4F77CCCB-68DC-4CC7-A528-DB6FF48741D0}.Release|iPhoneSimulator.ActiveCfg = Release|iPhoneSimulator
-		{4F77CCCB-68DC-4CC7-A528-DB6FF48741D0}.Release|iPhoneSimulator.Build.0 = Release|iPhoneSimulator
 		{4F77CCCB-68DC-4CC7-A528-DB6FF48741D0}.Debug|iPhone.ActiveCfg = Debug|iPhone
 		{4F77CCCB-68DC-4CC7-A528-DB6FF48741D0}.Debug|iPhone.Build.0 = Debug|iPhone
+		{4F77CCCB-68DC-4CC7-A528-DB6FF48741D0}.Debug|iPhoneSimulator.ActiveCfg = Debug|iPhoneSimulator
+		{4F77CCCB-68DC-4CC7-A528-DB6FF48741D0}.Debug|iPhoneSimulator.Build.0 = Debug|iPhoneSimulator
+		{4F77CCCB-68DC-4CC7-A528-DB6FF48741D0}.Release|Any CPU.ActiveCfg = Release|iPhoneSimulator
+		{4F77CCCB-68DC-4CC7-A528-DB6FF48741D0}.Release|Any CPU.Build.0 = Release|iPhoneSimulator
 		{4F77CCCB-68DC-4CC7-A528-DB6FF48741D0}.Release|iPhone.ActiveCfg = Release|iPhone
 		{4F77CCCB-68DC-4CC7-A528-DB6FF48741D0}.Release|iPhone.Build.0 = Release|iPhone
+		{4F77CCCB-68DC-4CC7-A528-DB6FF48741D0}.Release|iPhoneSimulator.ActiveCfg = Release|iPhoneSimulator
+		{4F77CCCB-68DC-4CC7-A528-DB6FF48741D0}.Release|iPhoneSimulator.Build.0 = Release|iPhoneSimulator
 		{7ED4972A-D279-4E63-B4F5-3D15590D4AA1}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{7ED4972A-D279-4E63-B4F5-3D15590D4AA1}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{7ED4972A-D279-4E63-B4F5-3D15590D4AA1}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{7ED4972A-D279-4E63-B4F5-3D15590D4AA1}.Release|Any CPU.Build.0 = Release|Any CPU
-		{7ED4972A-D279-4E63-B4F5-3D15590D4AA1}.Debug|iPhoneSimulator.ActiveCfg = Debug|Any CPU
-		{7ED4972A-D279-4E63-B4F5-3D15590D4AA1}.Debug|iPhoneSimulator.Build.0 = Debug|Any CPU
-		{7ED4972A-D279-4E63-B4F5-3D15590D4AA1}.Release|iPhoneSimulator.ActiveCfg = Release|Any CPU
-		{7ED4972A-D279-4E63-B4F5-3D15590D4AA1}.Release|iPhoneSimulator.Build.0 = Release|Any CPU
 		{7ED4972A-D279-4E63-B4F5-3D15590D4AA1}.Debug|iPhone.ActiveCfg = Debug|Any CPU
 		{7ED4972A-D279-4E63-B4F5-3D15590D4AA1}.Debug|iPhone.Build.0 = Debug|Any CPU
+		{7ED4972A-D279-4E63-B4F5-3D15590D4AA1}.Debug|iPhoneSimulator.ActiveCfg = Debug|Any CPU
+		{7ED4972A-D279-4E63-B4F5-3D15590D4AA1}.Debug|iPhoneSimulator.Build.0 = Debug|Any CPU
+		{7ED4972A-D279-4E63-B4F5-3D15590D4AA1}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7ED4972A-D279-4E63-B4F5-3D15590D4AA1}.Release|Any CPU.Build.0 = Release|Any CPU
 		{7ED4972A-D279-4E63-B4F5-3D15590D4AA1}.Release|iPhone.ActiveCfg = Release|Any CPU
 		{7ED4972A-D279-4E63-B4F5-3D15590D4AA1}.Release|iPhone.Build.0 = Release|Any CPU
+		{7ED4972A-D279-4E63-B4F5-3D15590D4AA1}.Release|iPhoneSimulator.ActiveCfg = Release|Any CPU
+		{7ED4972A-D279-4E63-B4F5-3D15590D4AA1}.Release|iPhoneSimulator.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

UndoAssessment/UndoAssessment.Android/UndoAssessment.Android.csproj

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -92,5 +92,8 @@
       <Name>UndoAssessment</Name>
     </ProjectReference>
   </ItemGroup>
- <Import Project="$(MSBuildExtensionsPath)\Xamarin\Android\Xamarin.Android.CSharp.targets" />
-</Project>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable\user.png" />
+  </ItemGroup>
+  <Import Project="$(MSBuildExtensionsPath)\Xamarin\Android\Xamarin.Android.CSharp.targets" />
+</Project>

UndoAssessment/UndoAssessment.iOS/UndoAssessment.iOS.csproj

@@ -142,4 +142,7 @@
       <Name>UndoAssessment</Name>
     </ProjectReference>
   </ItemGroup>
+  <ItemGroup>
+    <BundleResource Include="Resources\user.png" />
+  </ItemGroup>
 </Project>

UndoAssessment/UndoAssessment/App.xaml.cs

@@ -3,17 +3,22 @@
 using Xamarin.Forms.Xaml;
 using UndoAssessment.Services;
 using UndoAssessment.Views;
+using System.Threading.Tasks;
+using System.ComponentModel.Design;
 
 namespace UndoAssessment
 {
-    public partial class App : Application
+    public partial class App : Application, IDialogService
     {
 
         public App ()
         {
             InitializeComponent();
 
             DependencyService.Register<MockDataStore>();
+            DependencyService.Register<DataRepository>();
+            DependencyService.Register<UserReopsitory>();
+            DependencyService.RegisterSingleton<IDialogService>(this);
             MainPage = new AppShell();
         }
 
@@ -28,6 +33,13 @@ protected override void OnSleep ()
         protected override void OnResume ()
         {
         }
+
+
+        //Rather rough but valid MVVM approach to dialog service 
+        public async Task ShowDialogAsync(string title, string message, string cancel)
+        {
+            await this.MainPage.DisplayAlert(title, message, cancel);
+        }
     }
 }
 

UndoAssessment/UndoAssessment/AppShell.xaml

@@ -30,6 +30,7 @@
     </Shell.Resources>
 
     <TabBar>
+        <ShellContent Title="Data" Icon="icon_about.png" Route="DataFetchPage" ContentTemplate="{DataTemplate local:DataFetchPage}" />
         <ShellContent Title="About" Icon="icon_about.png" Route="AboutPage" ContentTemplate="{DataTemplate local:AboutPage}" />
         <ShellContent Title="Browse" Icon="icon_feed.png" ContentTemplate="{DataTemplate local:ItemsPage}" />
     </TabBar>

UndoAssessment/UndoAssessment/AppShell.xaml.cs

@@ -13,6 +13,7 @@ public AppShell()
             InitializeComponent();
             Routing.RegisterRoute(nameof(ItemDetailPage), typeof(ItemDetailPage));
             Routing.RegisterRoute(nameof(NewItemPage), typeof(NewItemPage));
+            Routing.RegisterRoute(nameof(UserDataPage), typeof(UserDataPage));
         }
 
     }

UndoAssessment/UndoAssessment/Converters/InvertedBoolConverter.cs

@@ -0,0 +1,68 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Text;
+using Xamarin.Forms;
+
+namespace UndoAssessment.Converters
+{
+    internal class InvertedBoolConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if(value is bool boolValue)
+            {
+                return !boolValue;
+            }
+
+            return value;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is bool boolValue)
+            {
+                return !boolValue;
+            }
+
+            return value;
+        }
+    }
+
+    internal class NullOrEmptyStringToBoolConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is string stringValue)
+            {
+                return !string.IsNullOrEmpty(stringValue);
+            }
+
+            return value;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+
+
+    internal class PositiveIntToBoolConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value is int intValue)
+            {
+                return intValue >= 0;
+            }
+
+            return value;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

UndoAssessment/UndoAssessment/Models/FailedMessage.cs

@@ -0,0 +1,19 @@
+using Newtonsoft.Json;
+using System;
+
+namespace UndoAssessment.Models
+{
+    public class FailedMessage
+    {
+        [JsonProperty("errorCode")]
+        public int ErrorCode { get; set; }
+
+        [JsonProperty("message")]
+        public string Message { get; set; }
+
+        [JsonProperty("date")]
+        public DateTime Date { get; set; }
+    }
+
+
+}

UndoAssessment/UndoAssessment/Models/Item.cs

@@ -1,11 +1,10 @@
-using System;
-
-namespace UndoAssessment.Models
+namespace UndoAssessment.Models
 {
     public class Item
     {
         public string Id { get; set; }
         public string Text { get; set; }
         public string Description { get; set; }
     }
+
 }

UndoAssessment/UndoAssessment/Models/SuccessfulMessage.cs

@@ -0,0 +1,16 @@
+using Newtonsoft.Json;
+using System;
+
+namespace UndoAssessment.Models
+{
+    public class SuccessfulMessage
+    {
+        [JsonProperty("message")]
+        public string Message { get; set; }
+
+        [JsonProperty("date")]
+        public DateTime Date { get; set; }
+    }
+
+
+}

UndoAssessment/UndoAssessment/Models/User.cs

@@ -0,0 +1,9 @@
+namespace UndoAssessment.Models
+{
+    public class User
+    {
+        public string Name { get; set; }
+        public int Age { get; set; }
+    }
+
+}

UndoAssessment/UndoAssessment/Services/DataRepository.cs

@@ -0,0 +1,64 @@
+using Polly;
+using System;
+using System.Collections.Generic;
+using System.Net.Http;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using UndoAssessment.Models;
+
+namespace UndoAssessment.Services
+{
+    public class DataRepository
+    {
+        private const string SuccessUrl = "https://malkarakundostagingpublicapi.azurewebsites.net/success";
+        private const string FailUrl = "https://malkarakundostagingpublicapi.azurewebsites.net/fail";
+
+        private HttpClient client;
+        private IAsyncPolicy<HttpResponseMessage> defaultPolicy;
+
+        public DataRepository()
+        {
+            client = new HttpClient();
+            defaultPolicy = GetRetryPolicy();
+        }
+
+        public async Task<SuccessfulMessage> GetSuccess(CancellationToken cancellationToken)
+        {
+            var result = await ExecuteCall(SuccessUrl, cancellationToken);
+
+            return await ReadData<SuccessfulMessage>(result);
+        }
+
+        public async Task<FailedMessage> GetFailed(CancellationToken cancellationToken)
+        {
+            var result = await ExecuteCall(FailUrl, cancellationToken);
+
+            return await ReadData<FailedMessage>(result);
+        }
+
+        private async Task<HttpResponseMessage> ExecuteCall(string url, CancellationToken cancellationToken)
+        {
+            return await defaultPolicy.ExecuteAsync(async () => await client.GetAsync(url, cancellationToken));
+        }
+
+        private async Task<T> ReadData<T>(HttpResponseMessage responseMessage)
+        {
+            var data = await responseMessage.Content.ReadAsStringAsync();
+
+            return Newtonsoft.Json.JsonConvert.DeserializeObject<T>(data);
+        }
+
+        static IAsyncPolicy<HttpResponseMessage> GetRetryPolicy()
+        {
+            //We can make stricter policies in future to prevent failed requests...
+            return Policy
+                .HandleResult<HttpResponseMessage>(message => !message.IsSuccessStatusCode)
+                .WaitAndRetryAsync(3, i => TimeSpan.FromSeconds(2), (result, timeSpan, retryCount, context) =>
+                {
+                    //Logging placeholder
+                    System.Diagnostics.Debug.WriteLine($"Request failed with {result.Result.StatusCode}. Waiting {timeSpan} before next retry. Retry attempt {retryCount}");
+                });
+        }
+    }
+}