feat: we've got the configuration bits working

App.axaml

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+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="app.App"
+             xmlns:local="using:app"
+             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

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+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Data.Core;
+using Avalonia.Data.Core.Plugins;
+using System.Linq;
+using Avalonia.Markup.Xaml;
+using app.ViewModels;
+using app.Views;
+
+namespace app;
+
+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 static 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);
+        }
+    }
+}

Models/ConfigModel.cs

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+namespace app.Models;
+
+public class ConfigModel
+{
+    public string ApiKey { get; set; } = "";
+    public string SpeakModel { get; set; } = "aura-athena-en";
+    public string ListenModel { get; set; } = "nova-2";
+    public string ThinkModel { get; set; } = "claude-3-haiku-20240307";
+}

Program.cs

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+using Avalonia;
+using System;
+
+namespace app;
+
+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();
+}

Styles.axaml

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+<Styles xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+  <Design.PreviewWith>
+    <Border Padding="20">
+      <!-- Add Controls for Previewer Here -->
+    </Border>
+  </Design.PreviewWith>
+
+  <!-- Add Styles Here -->
+</Styles>

ViewLocator.cs

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+using System;
+using Avalonia.Controls;
+using Avalonia.Controls.Templates;
+using app.ViewModels;
+
+namespace app;
+
+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/AgentWindowViewModel.cs

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+namespace app.ViewModels;
+
+using System;
+using System.IO;
+using System.Text.Json;
+using app.Models;
+
+public partial class AgentWindowViewModel : ViewModelBase
+{
+    
+}

ViewModels/ConfigWindowViewModel.cs

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+namespace app.ViewModels;
+
+using Avalonia.Interactivity;
+using System;
+using System.IO;
+using System.Text.Json;
+using app.Models;
+
+public partial class ConfigWindowViewModel : ViewModelBase
+{
+
+
+}

ViewModels/MainWindowViewModel.cs

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+namespace app.ViewModels;
+
+using System;
+using System.IO;
+using System.Text.Json;
+using System.Collections.Generic;
+using Avalonia.Controls;
+using app.Models;
+using app.Views;
+
+public partial class MainWindowViewModel : ViewModelBase
+{
+    private UserControl _currentView;
+    public UserControl CurrentView
+    {
+        get => _currentView;
+        set => SetProperty(ref _currentView, value);
+    }
+    private ConfigModel config { get; set; }
+    public string ActionButtonText { get; set; } = "Start Conversation";
+    public string ApiKey { get; set; }
+    public string SpeakModel { get; set; }
+    public string ListenModel { get; set; }
+    public string ThinkModel { get; set; }
+    public List<string> SpeakModels { get; } = new()
+        {
+            "aura-asteria-en", "aura-luna-en", "aura-athena-en", "aura-stella-en",
+            "aura-hera-en", "aura-orion-en", "aura-arcas-en", "aura-perseus-en",
+            "aura-angus-en", "aura-orpheus-en", "aura-helios-en", "aura-zeus-en"
+        };
+
+    public List<string> ListenModels { get; } = new()
+        {
+            "nova-2", "nova-2-meeting", "nova-2-phonecall", "nova-2-finance",
+            "nova-2-conversationalai", "nova-2-finance", "nova-2-voicemail",
+            "nova-2-video", "nova-2-medical", "nova-2-drivethru", "nova-2-automotive",
+            "nova-2-atc", "nova", "nova-phonecall", "nova-medical", "enhanced",
+            "enhanced-phonecall", "enhanced-meeting", "enhanced-finance", "base",
+            "base-phonecall", "base-meeting", "base-finance", "base-conversationalai",
+            "base-voicemail", "base-video", "whisper-tiny", "whisper-small",
+            "whisper-medium", "whisper-large", "whisper-base"
+        };
+
+    public List<string> ThinkModels { get; } = new()
+        {
+            "gpt-4o-mini", "claude-3-haiku-20240307"
+        };
+
+    public MainWindowViewModel()
+    {
+        config = GetConfig();
+        ApiKey = config.ApiKey;
+        SpeakModel = config.SpeakModel;
+        ListenModel = config.ListenModel;
+        ThinkModel = config.ThinkModel;
+        if (string.IsNullOrEmpty(config.ApiKey))
+        {
+            CurrentView = new ConfigWindow();
+            return;
+        }
+        CurrentView = new AgentWindow();
+    }
+    private static string ConfigPath = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile) + "/.config/deepgram-voice-assistant";
+    private static string ConfigFilePath = ConfigPath + "/config.json";
+    private static ConfigModel GetConfig()
+    {
+        // if config directory does not exist, create it
+        if (!Directory.Exists(ConfigPath))
+        {
+            Console.WriteLine("Creating config directory");
+            Directory.CreateDirectory(ConfigPath);
+        }
+        // check if file exists
+        if (!File.Exists(ConfigFilePath))
+        {
+            // create file too
+            Console.WriteLine("Creating config file");
+            using FileStream fs = File.Create(ConfigFilePath);
+            fs.Close();
+            // write default config
+            Console.WriteLine("Writing default config");
+            using StreamWriter writer = new(ConfigFilePath);
+            writer.WriteLine("{\n\t\"apiKey\": \"\",\n\t\"speakModel\": \"aura-athena-en\",\n\t\"listenModel\": \"nova-2\",\n\t\"thinkModel\": \"claude-3-haiku-20240307\"\n}");
+            writer.Close();
+        }
+        // Read the config file
+        using StreamReader reader = new(ConfigFilePath);
+        string json = reader.ReadToEnd();
+        reader.Close();
+        return JsonSerializer.Deserialize<ConfigModel>(json);
+    }
+    private static void UpdateConfig(ConfigModel config)
+    {
+        // Write the config file
+        using StreamWriter writer = new(ConfigFilePath);
+        writer.WriteLine(JsonSerializer.Serialize(config));
+        writer.Close();
+    }
+
+    public void SaveConfig()
+    {
+        string speakModel = SpeakModel;
+        string listenModel = ListenModel;
+        string thinkModel = ThinkModel;
+        Console.WriteLine("Saving config");
+        Console.WriteLine("ApiKey: " + ApiKey);
+        Console.WriteLine("SpeakModel: " + speakModel);
+        Console.WriteLine("ListenModel: " + listenModel);
+        Console.WriteLine("ThinkModel: " + thinkModel);
+        config = new()
+        {
+            ApiKey = ApiKey,
+            SpeakModel = speakModel,
+            ListenModel = listenModel,
+            ThinkModel = thinkModel
+        };
+        UpdateConfig(config);
+        CurrentView = new AgentWindow();
+    }
+
+    public void OpenConfig()
+    {
+        CurrentView = new ConfigWindow();
+    }
+
+    public void ToggleConversation() {
+        if (ActionButtonText == "Start Conversation") {
+            StartConversation();
+        } else {
+            EndConversation();
+        }
+    }
+
+    public void StartConversation() {
+        ActionButtonText = "End Conversation";
+    }
+
+    public void EndConversation() {
+        ActionButtonText = "Start Conversation";
+    }
+}

ViewModels/ViewModelBase.cs

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+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace app.ViewModels;
+
+public class ViewModelBase : ObservableObject
+{
+}

Views/AgentWindow.axaml

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+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:vm="using:app.ViewModels"
+             x:DataType="vm:MainWindowViewModel"
+             x:Class="app.Views.AgentWindow">
+   <StackPanel>
+        <TextBlock Text="Deepgram Voice Agent" HorizontalAlignment="Center" VerticalAlignment="Center"/>
+        <Grid ShowGridLines="False" Margin="5" ColumnDefinitions="Auto, Auto" RowDefinitions="Auto, Auto, Auto, Auto">
+            <ToggleButton Grid.Row="0" Grid.Column="0" Command="{Binding ToggleConversation}">
+                <Panel>
+                    <TextBlock Classes="start" Text="Start Listening"/>
+                    <TextBlock Classes="stop" Text="Stop Listening"/>
+                </Panel>
+            </ToggleButton>
+            <Button Grid.Row="1" Grid.Column="0" Command="{Binding OpenConfig}">Edit Configuration</Button>
+        </Grid>
+    </StackPanel>
+</UserControl>

Views/AgentWindow.axaml.cs

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+using Avalonia.Controls;
+using app.Models;
+using app.ViewModels;
+
+namespace app.Views;
+
+public partial class AgentWindow : UserControl 
+{
+    public AgentWindow()
+    {
+        InitializeComponent();
+    }
+}

Views/ConfigWindow.axaml

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+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:vm="using:app.ViewModels"
+             x:DataType="vm:MainWindowViewModel"
+             x:Class="app.Views.ConfigWindow">
+   <StackPanel>
+        <TextBlock Text="Configure your application!" HorizontalAlignment="Center" VerticalAlignment="Center"/>
+        <Grid ShowGridLines="False" Margin="5" ColumnDefinitions="Auto, Auto" RowDefinitions="Auto, Auto, Auto, Auto">
+            <Label Grid.Row="0" Grid.Column="0">API Key:</Label>
+            <TextBox Grid.Row="0" Grid.Column="1" Text="{Binding ApiKey, Mode=TwoWay}"/>
+            <Label Grid.Row="1" Grid.Column="0">Speak Model</Label>
+            <ComboBox Grid.Row="1" Grid.Column="1" SelectedItem="{Binding SpeakModel, Mode=TwoWay}" ItemsSource="{Binding SpeakModels}">
+            </ComboBox>
+            <Label Grid.Row="2" Grid.Column="0">Listen Model:</Label>
+            <ComboBox Grid.Row="2" Grid.Column="1" SelectedIndex="0" SelectedItem="{Binding ListenModel, Mode=TwoWay}" ItemsSource="{Binding ListenModels}">
+            </ComboBox>
+            <Label Grid.Row="3" Grid.Column="0">Think Model:</Label>
+            <ComboBox Grid.Row="3" Grid.Column="1" SelectedIndex="0" SelectedItem="{Binding ThinkModel, Mode=TwoWay}" ItemsSource="{Binding ThinkModels}">
+            </ComboBox>
+        </Grid>
+        <Button Command="{Binding SaveConfig}">Save</Button>
+    </StackPanel>
+</UserControl>

Views/ConfigWindow.axaml.cs

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+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using System;
+
+namespace app.Views;
+
+public partial class ConfigWindow : UserControl
+{
+
+    public ConfigWindow()
+    {
+        InitializeComponent();
+    }
+}

Views/MainWindow.axaml

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+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="using:app.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="app.Views.MainWindow"
+        x:DataType="vm:MainWindowViewModel"
+        Icon="/Assets/avalonia-logo.ico"
+        Title="Deepgram Voice Assistant">
+    <Window.Styles>
+        <Style Selector="ToggleButton .start">
+            <Setter Property="IsVisible" Value="False"/>
+        </Style>
+        <Style Selector="ToggleButton:checked .start">
+            <Setter Property="IsVisible" Value="True"/>
+        </Style>
+        <Style Selector="ToggleButton .stop">
+            <Setter Property="IsVisible" Value="True"/>
+        </Style>
+        <Style Selector="ToggleButton:checked .stop">
+            <Setter Property="IsVisible" Value="False"/>
+        </Style>
+    </Window.Styles>
+
+    <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>
+
+    <ContentControl Content="{Binding CurrentView}"/>
+
+</Window>

Views/MainWindow.axaml.cs

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+using Avalonia.Controls;
+
+namespace app.Views;
+
+public partial class MainWindow : Window
+{
+
+    public MainWindow()
+    {
+        InitializeComponent();
+    }
+}

app.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net9.0</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="11.2.1" />
+    <PackageReference Include="Avalonia.Desktop" Version="11.2.1" />
+    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.2.1" />
+    <PackageReference Include="Avalonia.Fonts.Inter" Version="11.2.1" />
+    <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
+    <PackageReference Include="Avalonia.Diagnostics" Version="11.2.1">
+      <IncludeAssets Condition="'$(Configuration)' != 'Debug'">None</IncludeAssets>
+      <PrivateAssets Condition="'$(Configuration)' != 'Debug'">All</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="CommunityToolkit.Mvvm" Version="8.2.1" />
+  </ItemGroup>
+</Project>

app.manifest

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+<?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="app.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>