add appstate

src/SharpIDE.Godot/Features/IdeSettings/AppStateLoader.cs

@@ -0,0 +1,39 @@
+using System.Text.Json;
+using Ardalis.GuardClauses;
+
+namespace SharpIDE.Godot.Features.IdeSettings;
+
+public static class AppStateLoader
+{
+    private static string GetConfigFilePath()
+    {
+        var folder = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
+        var configFolder = Path.Combine(folder, "SharpIDE");
+        Directory.CreateDirectory(configFolder);
+        var configFilePath = Path.Combine(configFolder, "sharpIde.json");
+        return configFilePath;
+    }
+
+    public static AppState LoadAppStateFromConfigFile()
+    {
+        var configFilePath = GetConfigFilePath();
+        if (File.Exists(configFilePath) is false)
+        {
+            File.WriteAllText(configFilePath, "{}");
+        }
+
+        using var stream = File.OpenRead(configFilePath);
+        var deserializedAppState = JsonSerializer.Deserialize<AppState>(stream);
+        Guard.Against.Null(deserializedAppState, nameof(deserializedAppState));
+        
+        return deserializedAppState;
+    }
+
+    public static void SaveAppStateToConfigFile(AppState appState)
+    {
+        var configFilePath = GetConfigFilePath();
+        using var stream = File.Create(configFilePath);
+        JsonSerializer.Serialize(stream, appState);
+        stream.Flush();
+    }
+}