.idea/.idea.pcgs-inv/.idea/.gitignore

@@ -1,13 +0,0 @@
-# Default ignored files
-/shelf/
-/workspace.xml
-# Rider ignored files
-/.idea.pcgs-inv.iml
-/contentModel.xml
-/modules.xml
-/projectSettingsUpdater.xml
-# Editor-based HTTP Client requests
-/httpRequests/
-# Datasource local storage ignored files
-/dataSources/
-/dataSources.local.xml

.idea/.idea.pcgs-inv/.idea/avalonia.xml

@@ -1,18 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="AvaloniaProject">
-    <option name="projectPerEditor">
-      <map>
-        <entry key="PcgsInvUi/App.axaml" value="PcgsInvUi/PcgsInvUi.csproj" />
-        <entry key="PcgsInvUi/Views/CoinListView.axaml" value="PcgsInvUi/PcgsInvUi.csproj" />
-        <entry key="PcgsInvUi/Views/DeleteWindow.axaml" value="PcgsInvUi/PcgsInvUi.csproj" />
-        <entry key="PcgsInvUi/Views/ErrorWindow.axaml" value="PcgsInvUi/PcgsInvUi.csproj" />
-        <entry key="PcgsInvUi/Views/FindWindow.axaml" value="PcgsInvUi/PcgsInvUi.csproj" />
-        <entry key="PcgsInvUi/Views/MainWindow.axaml" value="PcgsInvUi/PcgsInvUi.csproj" />
-        <entry key="PcgsInvUi/Views/MainWindowOld.axaml" value="PcgsInvUi/PcgsInvUi.csproj" />
-        <entry key="PcgsInvUi/Views/NewControl.axaml" value="PcgsInvUi/PcgsInvUi.csproj" />
-        <entry key="PcgsInvUi/Views/NewView.axaml" value="PcgsInvUi/PcgsInvUi.csproj" />
-      </map>
-    </option>
-  </component>
-</project>

.idea/.idea.pcgs-inv/.idea/discord.xml

@@ -1,7 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="DiscordProjectSettings">
-    <option name="show" value="PROJECT_FILES" />
-    <option name="description" value="" />
-  </component>
-</project>

.idea/.idea.pcgs-inv/.idea/encodings.xml

@@ -1,4 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="Encoding" addBOMForNewFiles="with BOM under Windows, with no BOM otherwise" />
-</project>

.idea/.idea.pcgs-inv/.idea/indexLayout.xml

@@ -1,8 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="UserContentModel">
-    <attachedFolders />
-    <explicitIncludes />
-    <explicitExcludes />
-  </component>
-</project>

PcgsInvUi/App.axaml.cs

@@ -1,12 +1,9 @@
-using System;
-using System.Data.Entity.Migrations.Model;
 using Avalonia;
 using Avalonia.Controls.ApplicationLifetimes;
 using Avalonia.Markup.Xaml;
 using PcgsInvUi.Services;
 using PcgsInvUi.ViewModels;
 using PcgsInvUi.Views;
-using PcgsInvUi.Models;
 
 namespace PcgsInvUi;
 
@@ -23,14 +20,11 @@ public partial class App : Application {
                 DataContext = new MainWindowViewModel(coins),
             };
             
+            // Allow the application to save the database when it exits.
             desktop.Exit += (sender, args) => {
                 coins.UpdateCollection("CollectionTable");
             };
         }
         base.OnFrameworkInitializationCompleted();
     }
-
-    public void OnExit(object sender, ControlledApplicationLifetimeExitEventArgs e) {
-        // Save the database?
-    }
-}
+}

PcgsInvUi/Services/CoinCollection.cs

@@ -1,12 +0,0 @@
-using System.Collections.Generic;
-using PcgsInvUi.Models;
-
-namespace PcgsInvUi.Services;
-
-public class CoinCollection {
-    public IEnumerable<Coin> GetItems() => new[] {
-        new Coin(),
-        new Coin(),
-        new Coin(),
-    };
-}

PcgsInvUi/Services/CoinDatabase.cs

@@ -10,23 +10,29 @@ public class CoinDatabase {
     public SQLiteConnection Connection { get; set; }
     private Boolean IsConnected { get; set; }
     public ObservableCollection<Coin> Collection { get; set; }
+    public Boolean IsClientConnected { get; set; }
 
-    private PcgsClient _pcgsClient;
-
+    private PcgsClient? _pcgsClient;
+    
+    /// <summary>
+    /// Creates and initilizes a new instance of the CoinDatabase.
+    /// Must call TryInitApiClient() after creating a new instance.
+    /// </summary>
     public CoinDatabase() {
         // Create a connection to SQLite
         Connection = CreateConnection();
-        // Create a client to access the API.
-        _pcgsClient = new PcgsClient(
-            "eAb8gS0I2XAvT_5gJeiGJaglMia1Tk-oB4kJUK6kuafyrny_S61vIJY-Ikl4nCQM67wrdxzUqLVWTV2kBSxD3d5XNBHxHnYBhcSS6dOPug0hZaF3qAv56df3gYSzOGh9Tif5y0eP3Iw0LrqKDr1Hj-dk6SV6GKog2IIqCPQhhHH8FMTWBTYO-_O8cx7qLdM5GM8KlTsic6g3VRUhM8EA_4OO04dCfmNLGhqINRl3jGZ0Q4ziI8fng2bVWsIyteqiPzUn10rIQ3-OPpqVZG_DxeOmOejj4GzbUNyqUOajy-nr5rYY");
         // Create a base table.
         CreateCollection("CollectionTable");
+        CreateApiTable();
         Console.WriteLine("Connected to database.");
         Collection = new ObservableCollection<Coin>();
         GetCollection("CollectionTable");
         Console.WriteLine("Got collection.");
     }
 
+    /// <summary>
+    /// Destructor. Currently not used, due to the strange nature of desktop applications.
+    /// </summary>
     ~CoinDatabase() {
         Console.WriteLine("Destructor called, saving collection.");
         // Save collection.
@@ -34,13 +40,74 @@ public class CoinDatabase {
         // Close the connection.
         Connection.Close();
     }
+    
+    /// <summary>
+    /// Attempts to intitialize the API client by selecting the API key from the database.
+    /// </summary>
+    /// <returns>True if the API key was found, false otherwise.</returns>
+    public async Task<bool> TryInitApiClient() {
+        Console.Write("Attempting to initialize API client... ");
+        SQLiteCommand cmd = Connection.CreateCommand();
+        cmd.CommandText = "SELECT API_KEY FROM ApiTable";
 
+        using (var reader = cmd.ExecuteReader()) {
+            if (reader.Read()) {
+                var apiKey = reader.GetString(0);
+                _pcgsClient = await PcgsClient.CreateClient(apiKey);
+
+                // Check that the client is valid.
+                if (_pcgsClient is null) {
+                    IsClientConnected = false;
+                    Console.WriteLine("Failed. API key was invalid.");
+                    return IsClientConnected;
+                }
+
+                IsClientConnected = true;
+                Console.WriteLine("Done! API key was found from database.");
+            }
+            else {
+                IsClientConnected = false;
+                Console.WriteLine("Failed. API key not found.");
+            }
+        }
+        return IsClientConnected;
+    }
+
+    /// <summary>
+    /// Atttempts to initialize the PCGS API client.
+    /// </summary>
+    /// <param name=apiKey>The API key to verify.</param>
+    /// <returns>A Task with a return value that returns true if the client intializes properly.</returns>
+    public async Task<bool> TryInitApiClient(string apiKey) {
+        Console.Write("Attempting to initialize API client with key param... ");
+        _pcgsClient = await PcgsClient.CreateClient(apiKey);
+        // Check if the API key is valid and if it is, then add to the database.
+        if (_pcgsClient is null) {
+            IsClientConnected = false;
+            Console.WriteLine("Failed. API key was invalid.");
+            return IsClientConnected;
+        }
+
+        var cmd = Connection.CreateCommand();
+        cmd.CommandText = $"INSERT INTO ApiTable (API_KEY, REQUESTS_REMAINING) VALUES (\"{apiKey}\", 1000)";
+        await cmd.ExecuteNonQueryAsync();
+
+        IsClientConnected = true;
+        Console.WriteLine("Done! API key was added to database.");
+        return IsClientConnected;
+    }
+
+    /// <summary>
+    /// Gets the collection from the database and stores it in the Collection property.
+    /// Creates the collection table if it does not exist already.
+    /// </summary>
+    /// <returns>The SQLiteConnection that corresponds to the connected database.</returns>
     private SQLiteConnection CreateConnection() {
         // Check if database exists.
         if (!System.IO.File.Exists("coin_collection")) {
-            // Create the database.
+            // If not, create the database.
             Console.Write("Creating database... ");
-            SQLiteConnection.CreateFile("coin_collection");
+            SQLiteConnection.CreateFile("coin_collection.sqlite");
             Console.WriteLine("Done.");
         }
         
@@ -60,6 +127,33 @@ public class CoinDatabase {
         return connection;
     }
 
+    /// <summary>
+    /// Creates the table that stores the API key and the number of requests remaining.
+    /// </summary>
+    public void CreateApiTable() {
+        // Create a table to store the API key and the number of requests remaining.
+        if (!IsConnected) {
+            // TODO Create a NotConnectedToDatabaseException
+            Console.WriteLine("Not connected to database.");
+            return;
+        }
+
+        // Create a SQL command.
+        SQLiteCommand cmd = Connection.CreateCommand();
+        cmd.CommandText =
+          "CREATE TABLE IF NOT EXISTS ApiTable (" +
+          "API_KEY TEXT, " +
+          "REQUESTS_REMAINING INTEGER, " + 
+          "PRIMARY KEY(API_KEY))";
+
+        // Execute the command
+        cmd.ExecuteNonQuery();
+        Console.WriteLine("API table initialized.");
+    }
+
+    /// <summary>
+    /// Creates a table to store the collection.
+    /// </summary>
     public void CreateCollection(string collectionName) {
         // Create a table to store the collection.
         if (!IsConnected) {
@@ -93,8 +187,12 @@ public class CoinDatabase {
         
         // Execute the command.
         cmd.ExecuteNonQuery();
+        Console.WriteLine("Collection table initialized.");
     }
 
+    /// <summary>
+    /// Inserts a Coin object into the database.
+    /// </summary>
     public void InsertCoin(Coin coin) {
         Console.WriteLine("Inserting coin...");
         // Use our existing connection to insert a coin to the database.
@@ -121,6 +219,13 @@ public class CoinDatabase {
         Console.WriteLine("Coin inserted.");
     }
 
+    /// <summary>
+    /// Creates a Coin object and saves it to the database.
+    /// </summary>
+    /// <param name="pcgsNumber">The PCGS number of the coin.</param>
+    /// <param name="grade">The grade of the coin.</param>
+    /// <param name="quantity">The quantity of the coin.</param>
+    /// <returns>The error type returned by the API.</returns>
     public async Task<PcgsClient.ErrorType> CreateCoin(int pcgsNumber, string grade, int quantity) {
         Console.WriteLine("Creating coin...");
         // Create a coin by calling the API, then insert it into the database.
@@ -146,6 +251,12 @@ public class CoinDatabase {
         return apiResult.Item1;
     }
     
+    /// <summary>
+    /// Gets a coin from the database.
+    /// </summary>
+    /// <param name="pcgsNumber">The PCGS number of the coin.</param>
+    /// <param name="grade">The grade of the coin.</param>
+    /// <returns>The coin if it exists, null otherwise.</returns>
     public Coin? GetCoin(int pcgsNumber, string grade) {
         Console.WriteLine($"Getting coin {pcgsNumber}, {grade}...");
         int gradeInt = GetGradeFromString(grade);
@@ -165,6 +276,10 @@ public class CoinDatabase {
         return null;
     }
 
+    /// <summary>
+    /// Used to get all Coin objects within the database.
+    /// </summary>
+    /// <param name="collectionName">The name of the collection table.</param>
     public void GetCollection(string collectionName) {
         Console.WriteLine("Getting collection...");
         SQLiteCommand cmd = Connection.CreateCommand();
@@ -178,6 +293,11 @@ public class CoinDatabase {
         }
     }
 
+    /// <summary>
+    /// Creates a CSV formatted string from a collection.
+    /// </summary>
+    /// <param name="collectionName">The name of the collection table.</param>
+    /// <returns>A CSV formatted string.</returns>
     public String CollectionToCSV(string collectionName) {
         var cmd = Connection.CreateCommand();
         cmd.CommandText = $"SELECT * FROM {collectionName}";
@@ -226,6 +346,11 @@ public class CoinDatabase {
         return resultString;
     }
 
+    /// <summary>
+    /// Saves a Coin object to the database.
+    /// </summary>
+    /// <param name="collectionName">The name of the collection table.</param>
+    /// <param name="coin">The coin to save.</param>
     public void SaveCoin(string collectionName, Coin coin) {
         // Get and replace the coin from the database.
         Console.WriteLine("Saving coin...");
@@ -252,6 +377,10 @@ public class CoinDatabase {
         cmd.ExecuteNonQuery();
     }
 
+    /// <summary>
+    /// Synchronizes the database with the current contents of the specified collection.
+    /// </summary>
+    /// <param name="collectionName">The name of the collection table.</param>
     public void UpdateCollection(string collectionName) {
         // Update the database with the contents of the collection.
         // TODO This is a very inefficient way of doing this. I should be able to do this in one command.
@@ -260,6 +389,10 @@ public class CoinDatabase {
         }
     }
     
+    /// <summary>
+    /// Creates a Coin from the information in a reader specifically from this database.
+    /// </summary>
+    /// <param name="reader">The reader to get the information from.</param>
     private Coin CoinFromReader(SQLiteDataReader reader) {
         // Create a coin while filtering out any possible null values - they throw exceptions.
         Coin coin = new Coin();
@@ -283,6 +416,10 @@ public class CoinDatabase {
         return coin;
     }
     
+    /// <summary>
+    /// Deletes a Coin object from the database.
+    /// </summary>
+    /// <param name="delCoin">The coin to delete.</param>
     public void DeleteCoin(Coin delCoin) {
         SQLiteCommand cmd = Connection.CreateCommand();
         cmd.CommandText = "DELETE FROM CollectionTable WHERE PCGS_NUMBER = @PcgsNumber AND GRADE = @Grade";
@@ -292,9 +429,18 @@ public class CoinDatabase {
         cmd.ExecuteNonQuery();
     }
     
+    /// <summary>
+    /// Gets the grade from a string returned from the main window.
+    /// These are always in a format similar to "MS-65", so we can just get the last two characters.
+    /// </summary>
+    /// <param name="grade">The grade string.</param>
     private int GetGradeFromString(string grade) {
         var actualGrade = int.Parse(grade.Substring(grade.Length - 2));
         Console.WriteLine($"Grade is {actualGrade}");
         return actualGrade;
     }
-}
+}
+
+public class NotConnectedToDatabaseException : Exception {
+    public NotConnectedToDatabaseException() : base("Not connected to database.") { }
+}

PcgsInvUi/Services/PcgsClient.cs

@@ -1,11 +1,9 @@
 using System;
-using System.Collections.Generic;
 using System.Net.Http;
 using System.Net.Http.Headers;
 using System.Threading.Tasks;
 using PcgsInvUi.Models;
 using System.Text.Json;
-using DynamicData.Kernel;
 using ReactiveUI;
 
 namespace PcgsInvUi.Services;
@@ -27,14 +25,47 @@ public class PcgsClient : ReactiveObject {
     private readonly string _apiKey;
     private int _numApiRequests;
 
-    public PcgsClient(string apiKey) {
-        // _apiKey = apiKey;
-        _apiKey =
-            "E8xivTVN_k4Q8ubk8Xv_uU11U91WX0wDht4S4m4BAf2HPmKnGrZ0J2f9nccM7Ns1VkGoT1SXYR74I7aNaMKqXlJGEy3oobseKV0nGiqu1IKvFkOTVjhV37SWUVExSDFMC6FLzs7xJQIHwkcxr5JFOQNmc4ZytEh_-hmCN3NL-z0fEk98tzBmPJ_F7bq_xNru86QMD2A9yalu_dWe-lCysfyE2bCA2EDqwvWenRYf-0XnNtp6qlxxCMlCd-TDqqRKLC3qefCwpXSemwBiNSP5gbC9pwcKrZugkruuJ0nyxxThZymm";
+    /// <summary>
+    /// Creates a new instance of the PcgsClient class.
+    /// Although this is a constructor, it's meant to be called only from the CreateClient method.
+    /// </summary>
+    private PcgsClient(string apiKey) {
+        _apiKey = apiKey;
+    }
+    
+    /// <summary>
+    /// Creates a new instance of the PcgsClient class.
+    /// </summary>
+    /// <param name="apiKey">The api key to use for requests.</param>
+    /// <returns>A new instance of the PcgsClient class, or null if the key is invalid.</returns>
+    public static async Task<PcgsClient?> CreateClient(string apiKey) {
+        // Check if the api key is valid.
+        var testClient = new PcgsClient(apiKey);
+        var validCreds = await testClient.VerifyCredentials();
+        if (!validCreds) return null;
+        return testClient;
     }
 
+    /// <summary>
+    /// Sends a request to the API to verify the credentials.
+    /// </summary>
+    /// <returns>A boolean indicating whether or not the credentials are valid.</returns>
+    public async Task<bool> VerifyCredentials() {
+        // Create a way to check if the api key given is valid
+        // I think the best way to do this is to make a request to the api and see if it returns the expected response.
+        var result = await this.GetCoinFactsByGrade(1, "AG-03");  // This is a known invalid coin id - this is because the api is very fast with invalid requests.
+        if (result.Item1 == ErrorType.ApiKeyInvalid) return false;
+        return true;
+    }
+
+    /// <summary>
+    /// Gets the coin information for a given PCGS number and grade.
+    /// </summary>
+    /// <param name="pcgsNumber">The PCGS number of the coin.</param>
+    /// <param name="grade">The grade of the coin.</param>
+    /// <param name="plusGrade">Whether or not the coin is a plus grade.</param>
+    /// <returns>A tuple containing the error type and the coin information.</returns>
     public async Task<(ErrorType, Coin?)> GetCoinFactsByGrade(int pcgsNumber, string grade, bool plusGrade = false) {
-        Coin newCoin = null;
         using (HttpClient client = new HttpClient()) {
             var gradeParam = GetGradeFromString(grade);
 
@@ -46,6 +77,7 @@ public class PcgsClient : ReactiveObject {
             Console.WriteLine("Got response.");
 
             if (response.IsSuccessStatusCode) {
+                // Check response for errors.
                 string jsonResponse = await response.Content.ReadAsStringAsync();
                 var parsedResponse = ParseJsonResponse(jsonResponse);
                 return parsedResponse;
@@ -55,17 +87,25 @@ public class PcgsClient : ReactiveObject {
         return (ErrorType.ApiKeyInvalid, null);
     }
 
+    /// <summary>
+    /// Utility function to parse the grade number from the grade string passed from the front end.
+    /// </summary>
+    /// <param name="grade">The grade string.</param>
+    /// <returns>The grade number.</returns>
     private int GetGradeFromString(string grade) {
-        var actualGrade = int.Parse(grade.Substring(grade.Length - 2));
+        var actualGrade = int.Parse(grade.Substring(grade.Length - 2));  // Throws an exception if the grade doesn't exist.
         Console.WriteLine($"Grade is {actualGrade}");
         return actualGrade;
     }
 
-    // TODO Will eventually create the other methods that are included in the Public API.
-
+    /// <summary>
+    /// Parses the json response from the api.
+    /// </summary>
+    /// <param name="json">The json response.</param>
+    /// <returns>A tuple containing an error type and the coin information.</returns>
     private (ErrorType, Coin?) ParseJsonResponse(string json) {
         Console.WriteLine(json);
-        // TODO Check for errors in the response
+        // Check for errors in the response
         if (json.Contains("\"ServerMessage\":\"No data found\"")) return (ErrorType.NoCoinFound, null);
         if (json.Contains("\"IsValidRequest\":false")) return (ErrorType.InvalidRequestFormat, null);
 
@@ -86,4 +126,4 @@ class CoinNotFoundException : Exception {
     public CoinNotFoundException() { }
     public CoinNotFoundException(string message) : base(message) { }
     public CoinNotFoundException(string message, Exception inner) : base(message, inner) { }
-}
+}

PcgsInvUi/ViewModels/ApiKeyViewModel.cs

@@ -0,0 +1,30 @@
+using ReactiveUI;
+using System.Reactive;
+
+namespace PcgsInvUi.ViewModels;
+
+public class ApiKeyViewModel : ViewModelBase {
+    public string ApiKeyInput {
+        get => _apiKeyInput;
+        set => this.RaiseAndSetIfChanged(ref _apiKeyInput, value);
+    }
+    private string _apiKeyInput = "";
+
+    public bool OkEnabled {
+        get => _okEnabled;
+        set => this.RaiseAndSetIfChanged(ref _okEnabled, value);
+    }
+    private bool _okEnabled;
+
+    public ReactiveCommand<Unit, string> OkCommand { get; }
+
+    public ApiKeyViewModel() {
+        var okEnabled = this.WhenAnyValue(
+            x => x.ApiKeyInput,
+            x => !string.IsNullOrWhiteSpace(x));
+
+
+        // Get the API key from the user.
+        OkCommand = ReactiveCommand.Create(() => ApiKeyInput, okEnabled);
+    }
+}

PcgsInvUi/ViewModels/MainWindowViewModel.cs

@@ -7,21 +7,10 @@ using System.Reactive.Linq;
 using PcgsInvUi.Models;
 using PcgsInvUi.Services;
 using ReactiveUI;
+using System.Threading.Tasks;
 
 namespace PcgsInvUi.ViewModels;
 
-// TODO Create proper sums for total value.
-// TODO Error handling for API calls.
-// TODO Manual handling of API key.
-// TODO Use CoinFacts link.
-// TODO Splash screen during startup.
-// TODO Take giant sheet of coins to integrate into the application.
-// TODO Update all coins. Choose those that are older first.
-// TODO API request tracker (1000 per day)
-// TODO Ok button greys out while request is happening.
-// TODO Track when coins were last updated.
-// TODO Image for coin in notes view.
-
 public class MainWindowViewModel : ViewModelBase {
     public ViewModelBase SidebarContent {
         get => _sideContent;
@@ -47,14 +36,29 @@ public class MainWindowViewModel : ViewModelBase {
     private ViewModelBase _sideContent;
     private Coin? _selectedCoin;
     private double _totalValue;
-    
+
     public MainWindowViewModel(CoinDatabase coins) {
         ConnectedCoinDatabase = coins;
+        var keyFound = Task.Run(() => coins.TryInitApiClient()).Result;
+        Console.WriteLine("Function completed.");
         var newViewModel = new NewViewModel();
-        _sideContent = newViewModel;
+        var apiKeyViewModel = new ApiKeyViewModel();
         // DisplayedList = CoinCollection = new ObservableCollection<Coin>(coins.GetItems());
         DisplayedList = ConnectedCoinDatabase.Collection;
         TotalValue = DisplayedList.Sum(x => x.TotalPrice);
+
+        // Setup interaction to show ApiKeyWindow
+        apiKeyViewModel.OkCommand.Subscribe(async apiKey => {
+            if (await ConnectedCoinDatabase.TryInitApiClient(apiKey))
+                SidebarContent = newViewModel;  // Must assign this to the observable property rather than private variable.
+            });
+
+        // Check if API key must be entered.
+        if (!keyFound) {
+            Console.WriteLine("API key must be entered by user.");
+            // Show the API key input view.
+            _sideContent = apiKeyViewModel;
+        } else _sideContent = newViewModel;
         
         // Set up the ability to show the error window.
         ShowErrorWindow = new Interaction<ErrorWindowViewModel, bool>();
@@ -113,7 +117,8 @@ public class MainWindowViewModel : ViewModelBase {
                         break;
                 }
                 
-                // TODO Clear the text boxes.
+                // Clear the text boxes.
+                newViewModel.ClearText();
             });
         
         // Update TotalValue anytime a coin's quantity changes.
@@ -126,4 +131,11 @@ public class MainWindowViewModel : ViewModelBase {
             TotalValue = ConnectedCoinDatabase.Collection.Sum(x => x.TotalPrice);
         };
     }
+
+    // Create destructor to save the database when the application exits.
+    // This is necessary because the database is initialized in this class.
+    ~MainWindowViewModel() {
+        Console.WriteLine("Running MainWindowViewModel destructor.");
+        ConnectedCoinDatabase.UpdateCollection("CollectionTable");
+    }
 }

PcgsInvUi/ViewModels/NewViewModel.cs

@@ -40,9 +40,7 @@ public class NewViewModel : ViewModelBase {
             okEnabled);
 
         ClearCommand = ReactiveCommand.Create(() => {
-            PcgsNumber = "";
-            Grade = "";
-            Quantity = "";
+            ClearText();
         });
 
         // Initialize grade values for use in the view.
@@ -83,4 +81,13 @@ public class NewViewModel : ViewModelBase {
 
     public ReactiveCommand<Unit, (int, string, int)> OkCommand { get; }
     public ReactiveCommand<Unit, Unit> ClearCommand { get; }
-}
+
+    /// <summary>
+    /// Clears the text fields.
+    /// </summary>
+    public void ClearText() {
+        PcgsNumber = "";
+        Grade = "";
+        Quantity = "";
+    }
+}

PcgsInvUi/Views/ApiKeyView.axaml

@@ -0,0 +1,14 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:viewModels="clr-namespace:PcgsInvUi.ViewModels"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        x:Class="PcgsInvUi.Views.ApiKeyView" x:DataType="viewModels:ApiKeyViewModel" >
+    <StackPanel>
+        <Label Content="API key was not found or did not authenticate." /> 
+        <Label Content="Please enter your API key below:" />
+        <TextBox Margin="10" Text="{Binding ApiKeyInput}" />
+        <Button HorizontalAlignment="Center" Content="Submit" Command="{Binding OkCommand}" />
+    </StackPanel>
+</UserControl>

PcgsInvUi/Views/ApiKeyView.axaml.cs

@@ -0,0 +1,9 @@
+using Avalonia.Controls;
+
+namespace PcgsInvUi.Views; 
+
+public partial class ApiKeyView : UserControl {
+    public ApiKeyView() {
+        InitializeComponent();
+    }
+}

PcgsInvUi/Views/MainWindow.axaml.cs

@@ -1,5 +1,4 @@
 using System;
-using System.IO;
 using System.Reactive;
 using System.Threading.Tasks;
 using Avalonia.Platform.Storage;
@@ -36,6 +35,7 @@ public partial class MainWindow : ReactiveWindow<MainWindowViewModel> {
 
     private async Task ShowFilePickerAsync(InteractionContext<Unit, Uri> interationContext) {
         var topLevel = GetTopLevel(this);
+        if (topLevel is null) throw new Exception("Could not find top level of the file path.");
         var file = await topLevel.StorageProvider.SaveFilePickerAsync(new FilePickerSaveOptions {
             Title = "Save CSV...",
             DefaultExtension = ".csv",

PcgsInvUi/Views/NewView.axaml.cs

@@ -1,6 +1,4 @@
-using Avalonia;
-using Avalonia.Controls;
-using Avalonia.Markup.Xaml;
+using Avalonia.Controls;
 
 namespace PcgsInvUi.Views;
 
@@ -8,4 +6,4 @@ public partial class NewView : UserControl {
     public NewView() {
         InitializeComponent();
     }
-}
+}

README.md

@@ -2,7 +2,7 @@
 A coin collection inventory app, written in C# with the Avalonia UI framework utilizing the PCGS Public API.
 
 # Requirements
-[.NET Core >= 6](https://dotnet.microsoft.com/en-us/download) - you will be prompted for install before running the program if it is not installed.
+[.NET Runtime >= 6](https://dotnet.microsoft.com/en-us/download) - you will be prompted for install before running the program if it is not installed.
 
 # Install
 Extract contents of the downloaded file to an accessible folder (ie. Documents/PCGSApp)
@@ -31,3 +31,12 @@ in the lower right corner) will update automatically.
 
 To export into a CSV file, click the Export to CSV button in the lower right corner. This will allow you to choose a
 location and name for the file. These files are usable with any application that can open a .csv file, like Excel.
+
+# Contributions
+
+If you would like to help development, and don't mind looking through my spaghetti code (I'm still learning how to structure this)
+then feel free to submit a pull request! I'm happy to take any help that I can get.
+
+I've just started utilizing makefiles, however, since I'm currently using Windows, I'm not completely sure if there are formatting
+changes that should be made to that. I will leave makefile creation for other platforms up to someone that uses these other
+operating systems for now.

makefile

@@ -0,0 +1,5 @@
+build:
+	dotnet build .\PcgsInvUi\PcgsInvUi.csproj
+
+run:
+	dotnet run --project .\PcgsInvUi\PcgsInvUi.csproj

pcgs-inv.sln.DotSettings.user

@@ -0,0 +1,2 @@
+<wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
+	<s:Boolean x:Key="/Default/AddReferences/RecentPaths/=C_003A_005CProgram_0020Files_005Cdotnet_005Cpacks_005CMicrosoft_002ENETCore_002EApp_002ERef_005C7_002E0_002E13_005Cref_005Cnet7_002E0_005CSystem_002EData_002Edll/@EntryIndexedValue">True</s:Boolean></wpf:ResourceDictionary>