.gitignore

@@ -32,3 +32,35 @@ google-services.json
 
 # Android Profiling
 *.hprof
+
+# .NET build outputs
+bin/
+obj/
+
+# Visual Studio / Rider
+.vs/
+.idea/
+*.user
+*.suo
+*.userprefs
+*.sln.docstates
+
+# Build results
+[Dd]ebug/
+[Rr]elease/
+x64/
+x86/
+[Aa][Rr][Mm]/
+[Aa][Rr][Mm]64/
+bld/
+[Bb]in/
+[Oo]bj/
+
+# Visual Studio cache/options
+.vs/
+.vscode/
+*.rsuser
+*.suo
+*.user
+*.userosscache
+*.sln.docstates

App.axaml

@@ -0,0 +1,15 @@
+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="BackSafe.App"
+             xmlns:local="using:BackSafe"
+             RequestedThemeVariant="Default">
+             <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->
+
+    <Application.DataTemplates>
+        <local:ViewLocator/>
+    </Application.DataTemplates>
+  
+    <Application.Styles>
+        <FluentTheme />
+    </Application.Styles>
+</Application>

App.axaml.cs

@@ -0,0 +1,47 @@
+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Data.Core;
+using Avalonia.Data.Core.Plugins;
+using System.Linq;
+using Avalonia.Markup.Xaml;
+using BackSafe.ViewModels;
+using BackSafe.Views;
+
+namespace BackSafe;
+
+public partial class App : Application
+{
+    public override void Initialize()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+
+    public override void OnFrameworkInitializationCompleted()
+    {
+        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            // Avoid duplicate validations from both Avalonia and the CommunityToolkit. 
+            // More info: https://docs.avaloniaui.net/docs/guides/development-guides/data-validation#manage-validationplugins
+            DisableAvaloniaDataAnnotationValidation();
+            desktop.MainWindow = new MainWindow
+            {
+                DataContext = new MainWindowViewModel(),
+            };
+        }
+
+        base.OnFrameworkInitializationCompleted();
+    }
+
+    private void DisableAvaloniaDataAnnotationValidation()
+    {
+        // Get an array of plugins to remove
+        var dataValidationPluginsToRemove =
+            BindingPlugins.DataValidators.OfType<DataAnnotationsValidationPlugin>().ToArray();
+
+        // remove each entry found
+        foreach (var plugin in dataValidationPluginsToRemove)
+        {
+            BindingPlugins.DataValidators.Remove(plugin);
+        }
+    }
+}

BackSafe.csproj

@@ -0,0 +1,29 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
+    <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Folder Include="Models\" />
+    <AvaloniaResource Include="Assets\**" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Avalonia" Version="11.3.6" />
+    <PackageReference Include="Avalonia.Desktop" Version="11.3.6" />
+    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.3.6" />
+    <PackageReference Include="Avalonia.Fonts.Inter" Version="11.3.6" />
+    <PackageReference Include="FluentAvalonia" Version="1.1.0-beta1" />
+    <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
+    <PackageReference Include="Avalonia.Diagnostics" Version="11.3.6">
+      <IncludeAssets Condition="'$(Configuration)' != 'Debug'">None</IncludeAssets>
+      <PrivateAssets Condition="'$(Configuration)' != 'Debug'">All</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="CommunityToolkit.Mvvm" Version="8.2.1" />
+  </ItemGroup>
+</Project>

CLAUDE.md

@@ -0,0 +1,58 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+BackSafe is a cross-platform desktop application for backing up data from mobile phones (primarily Android, with photos/videos support on iOS/iPadOS) using a user-provided API key. Built with Avalonia UI and .NET 8, targeting Windows, macOS, and Linux.
+
+## Development Commands
+
+### Build and Run
+```bash
+dotnet build                    # Build the project
+dotnet run                      # Run the application
+dotnet build -c Release         # Build for release
+```
+
+### Debugging
+- Avalonia diagnostics are enabled in Debug builds only (BackSafe.csproj:22-25)
+- Use F12 or Ctrl+F12 within the running application to access DevTools in Debug mode
+
+## Architecture
+
+### UI Framework: Avalonia UI
+- Uses AXAML (Avalonia XAML) for UI definitions
+- Fluent theme is the default (App.axaml:13)
+- Compiled bindings enabled by default (BackSafe.csproj:8)
+
+### MVVM Pattern
+- **ViewModels**: Inherit from `ViewModelBase` (extends `ObservableObject` from CommunityToolkit.Mvvm)
+- **Views**: Located in `Views/` directory, defined with `.axaml` files and code-behind `.axaml.cs`
+- **ViewLocator**: Automatically maps ViewModels to Views by naming convention (ViewModel → View)
+  - Example: `MainWindowViewModel` → `MainWindow`
+  - Implementation in ViewLocator.cs:16
+
+### Application Entry Point
+- `Program.cs`: Standard .NET entry point
+  - Configures Avalonia with platform detection, Inter font, and trace logging
+- `App.axaml.cs`: Avalonia initialization
+  - Disables Avalonia's DataAnnotation validation to avoid conflicts with CommunityToolkit (App.axaml.cs:35-46)
+  - Sets MainWindow with MainWindowViewModel as DataContext
+
+### Key Dependencies
+- **Avalonia 11.3.6**: Cross-platform UI framework
+- **CommunityToolkit.Mvvm 8.2.1**: MVVM helpers (ObservableObject, commands, etc.)
+- **Avalonia.Fonts.Inter**: Default font package
+
+### Project Structure
+- `ViewModels/`: Contains all ViewModel classes
+- `Views/`: Contains AXAML view definitions and code-behind
+- `Models/`: Placeholder directory for data models
+- `Assets/`: Application resources (icons, etc.)
+- `app.manifest`: Windows application manifest
+
+## MVVM Conventions
+- ViewModels use partial classes to support MVVM Toolkit source generators
+- Properties in ViewModels should use `[ObservableProperty]` attribute for automatic INotifyPropertyChanged implementation
+- Views use `x:DataType` for compiled bindings (see MainWindow.axaml:8)

Program.cs

@@ -0,0 +1,21 @@
+using Avalonia;
+using System;
+
+namespace BackSafe;
+
+sealed class Program
+{
+    // Initialization code. Don't use any Avalonia, third-party APIs or any
+    // SynchronizationContext-reliant code before AppMain is called: things aren't initialized
+    // yet and stuff might break.
+    [STAThread]
+    public static void Main(string[] args) => BuildAvaloniaApp()
+        .StartWithClassicDesktopLifetime(args);
+
+    // Avalonia configuration, don't remove; also used by visual designer.
+    public static AppBuilder BuildAvaloniaApp()
+        => AppBuilder.Configure<App>()
+            .UsePlatformDetect()
+            .WithInterFont()
+            .LogToTrace();
+}

ViewLocator.cs

@@ -0,0 +1,31 @@
+using System;
+using Avalonia.Controls;
+using Avalonia.Controls.Templates;
+using BackSafe.ViewModels;
+
+namespace BackSafe;
+
+public class ViewLocator : IDataTemplate
+{
+
+    public Control? Build(object? param)
+    {
+        if (param is null)
+            return null;
+        
+        var name = param.GetType().FullName!.Replace("ViewModel", "View", StringComparison.Ordinal);
+        var type = Type.GetType(name);
+
+        if (type != null)
+        {
+            return (Control)Activator.CreateInstance(type)!;
+        }
+        
+        return new TextBlock { Text = "Not Found: " + name };
+    }
+
+    public bool Match(object? data)
+    {
+        return data is ViewModelBase;
+    }
+}

ViewModels/MainWindowViewModel.cs

@@ -0,0 +1,6 @@
+namespace BackSafe.ViewModels;
+
+public partial class MainWindowViewModel : ViewModelBase
+{
+    public string Greeting { get; } = "Welcome to Avalonia!";
+}

ViewModels/ViewModelBase.cs

@@ -0,0 +1,7 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace BackSafe.ViewModels;
+
+public class ViewModelBase : ObservableObject
+{
+}

Views/MainWindow.axaml

@@ -0,0 +1,20 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="using:BackSafe.ViewModels"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        x:Class="BackSafe.Views.MainWindow"
+        x:DataType="vm:MainWindowViewModel"
+        Icon="/Assets/avalonia-logo.ico"
+        Title="BackSafe">
+
+    <Design.DataContext>
+        <!-- This only sets the DataContext for the previewer in an IDE,
+             to set the actual DataContext for runtime, set the DataContext property in code (look at App.axaml.cs) -->
+        <vm:MainWindowViewModel/>
+    </Design.DataContext>
+
+    <TextBlock Text="{Binding Greeting}" HorizontalAlignment="Center" VerticalAlignment="Center"/>
+
+</Window>

Views/MainWindow.axaml.cs

@@ -0,0 +1,11 @@
+using Avalonia.Controls;
+
+namespace BackSafe.Views;
+
+public partial class MainWindow : Window
+{
+    public MainWindow()
+    {
+        InitializeComponent();
+    }
+}

app.manifest

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+  <!-- This manifest is used on Windows only.
+       Don't remove it as it might cause problems with window transparency and embedded controls.
+       For more details visit https://learn.microsoft.com/en-us/windows/win32/sbscs/application-manifests -->
+  <assemblyIdentity version="1.0.0.0" name="BackSafe.Desktop"/>
+
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+      <!-- A list of the Windows versions that this application has been tested on
+           and is designed to work with. Uncomment the appropriate elements
+           and Windows will automatically select the most compatible environment. -->
+
+      <!-- Windows 10 -->
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />
+    </application>
+  </compatibility>
+</assembly>

backsafe.sln

@@ -0,0 +1,24 @@
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.2.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BackSafe", "BackSafe.csproj", "{167A4AD4-4F11-F7F9-E8AC-6D41338AF814}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{167A4AD4-4F11-F7F9-E8AC-6D41338AF814}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{167A4AD4-4F11-F7F9-E8AC-6D41338AF814}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{167A4AD4-4F11-F7F9-E8AC-6D41338AF814}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{167A4AD4-4F11-F7F9-E8AC-6D41338AF814}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {BC0EECAB-90E8-450F-BBB1-AF85D5BD3409}
+	EndGlobalSection
+EndGlobal