Move save logic out of Game

Zennysoft.Game.Ma.Implementation/Save/SaveFileManager.cs

@@ -0,0 +1,56 @@
+using Chickensoft.Collections;
+using Chickensoft.Serialization.Godot;
+using Chickensoft.Serialization;
+using Godot;
+using System.IO.Abstractions;
+using System.Text.Json;
+using System.Text.Json.Serialization.Metadata;
+using Zennysoft.Game.Abstractions;
+
+namespace Zennysoft.Game.Ma.Implementation;
+
+public class SaveFileManager<T> : ISaveFileManager<T>
+{
+  private readonly IFileSystem _fileSystem;
+  public const string SAVE_FILE_NAME = "game.json";
+  public JsonSerializerOptions JsonOptions { get; set; } = default!;
+
+  public string SaveFilePath { get; set; } = default!;
+
+  public SaveFileManager(IFileSystem fileSystem)
+  {
+    _fileSystem = fileSystem;
+    SaveFilePath = _fileSystem.Path.Join(OS.GetUserDataDir(), SAVE_FILE_NAME);
+
+    var resolver = new SerializableTypeResolver();
+    GodotSerialization.Setup();
+    Serializer.AddConverter(new Texture2DConverter());
+
+    var upgradeDependencies = new Blackboard();
+
+    JsonOptions = new JsonSerializerOptions
+    {
+      Converters = {
+        new SerializableTypeConverter(upgradeDependencies)
+      },
+      TypeInfoResolver = JsonTypeInfoResolver.Combine(resolver, WeaponTagEnumContext.Default, ItemTagEnumContext.Default, ElementTypeEnumContext.Default, AccessoryTagEnumContext.Default, ThrowableItemTagEnumContext.Default, UsableItemTagEnumContext.Default, BoxItemTagEnumContext.Default),
+      WriteIndented = true
+    };
+  }
+
+
+  public async Task<T> ReadFromFile()
+  {
+    if (!_fileSystem.File.Exists(SaveFilePath))
+      throw new FileNotFoundException();
+
+    var json = await _fileSystem.File.ReadAllTextAsync(SaveFilePath);
+    return JsonSerializer.Deserialize<T>(json, JsonOptions);
+  }
+
+  public async Task WriteToFile(T gameData)
+  {
+    var json = JsonSerializer.Serialize(gameData, JsonOptions);
+    await _fileSystem.File.WriteAllTextAsync(SaveFilePath, json);
+  }
+}