Simulation bridge

src/ReactorMaintenance.Godot/Data/LevelStateLoader.cs

@@ -0,0 +1,34 @@
+using ReactorMaintenance.Simulation;
+using FileAccess = Godot.FileAccess;
+
+namespace ReactorMaintenance.Godot.Data;
+
+public static class LevelStateLoader
+{
+    public static LevelState Load(string path)
+    {
+        if (string.IsNullOrWhiteSpace(path))
+            throw new ArgumentException("Level path must not be null or empty.", nameof(path));
+
+        if (!FileAccess.FileExists(path))
+            throw new FileNotFoundException($"Level file not found: {path}");
+
+        var json = FileAccess.GetFileAsString(path);
+        if (string.IsNullOrWhiteSpace(json))
+            throw new InvalidOperationException($"Level file is empty: {path}");
+
+        try
+        {
+            return LevelSerializer.Deserialize(json);
+        }
+        catch (InvalidOperationException)
+        {
+            throw;
+        }
+        catch (Exception ex)
+        {
+            throw new InvalidOperationException(
+                $"Failed to deserialize level from {path}: {ex.Message}", ex);
+        }
+    }
+}