implement startup database loading (path still hardcoded)

Stars Assistant/Services/Game.cs

@@ -1,17 +1,58 @@
+using Splat;
+
 namespace StarsAssistant.Services;
 
 public class Game
 {
+    /// <summary>
+    /// Default constructor, initialize required fields manually, targeted
+    /// for Initial DB creation.
+    /// </summary>
+    public Game() {}
+
+    /// <summary>
+    /// Init game state from database, targeted for CLI arg.
+    /// </summary>
+    /// <param name="dbGame">Record loaded from DB</param>
+    public Game(Model.Game dbGame)
+    {
+        GamePath = dbGame.GamePath;
+        BaseName = dbGame.BaseName;
+    }
+
+    /// <summary>
+    /// Save this record in the database. Uses the service locator to access the 
+    /// database unless you specify an instance. This is needed during initial
+    /// game creation, where the services are not yet established.
+    /// </summary>
+    /// <param name="db">Optional DB instance if services are yet unavailable.</param>
+    public void SaveToDatabase(Model.StarsDatabase? db = null) 
+    {
+        db ??= Locator.Current.GetService<Model.StarsDatabase>()!;
+        
+        Model.Game? dbGame = db.Game.FirstOrDefault();
+        if (dbGame == null)
+        {
+            dbGame = new Model.Game();
+            db.Add(dbGame);
+            db.SaveChanges();
+        }
+        dbGame.GamePath = GamePath;
+        dbGame.BaseName = BaseName; 
+        db.Update(dbGame);
+        db.SaveChanges();
+    }
+
     /// <summary>
     /// The base path in which all game files reside.
     /// </summary>
-    public required string GamePath { get; set; }
+    public string GamePath { get; set; } = String.Empty;
 
     /// <summary>
     /// The base name without extensions of your game, inside the GamePath folder.
     /// All dependant files are resolved using this name.
     /// </summary>
-    public required string BaseName { get; set; }
+    public string BaseName { get; set; } = String.Empty;
 
     /// <summary>
     /// Combine into the DatabaseName