Bugfix in PluginSettings.

MosswartMassacre/PluginSettings.cs

@@ -10,35 +10,59 @@ namespace MosswartMassacre
     {
         private static PluginSettings _instance;
         private static string _filePath;
+        private static readonly object _sync = new object();
+
+        // backing fields
         private bool _remoteCommandsEnabled = false;
         private bool _rareMetaEnabled = true;
         private bool _httpServerEnabled = false;
-        private string _charTag = "default";
         private bool _telemetryEnabled = false;
-        public static PluginSettings Instance => _instance;
+        private string _charTag = "default";
+
+        public static PluginSettings Instance => _instance
+            ?? throw new InvalidOperationException("PluginSettings not initialized");
 
         public static void Initialize()
         {
+            // determine settings file path
             string characterName = CoreManager.Current.CharacterFilter.Name;
-            string pluginFolder = Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location);
+            string pluginFolder = Path.GetDirectoryName(
+                typeof(PluginSettings).Assembly.Location);
             _filePath = Path.Combine(pluginFolder, $"{characterName}.yaml");
 
+            // build serializer/deserializer once
+            var builder = new DeserializerBuilder()
+                .WithNamingConvention(UnderscoredNamingConvention.Instance);
+            var deserializer = builder.Build();
+
+            PluginSettings loaded = null;
+
             if (File.Exists(_filePath))
             {
-                var deserializer = new DeserializerBuilder()
-                    .WithNamingConvention(UnderscoredNamingConvention.Instance)
-                    .Build();
-
+                try
+                {
                     string yaml = File.ReadAllText(_filePath);
-                _instance = deserializer.Deserialize<PluginSettings>(yaml);
+                    loaded = deserializer.Deserialize<PluginSettings>(yaml);
+                }
+                catch (Exception ex)
+                {
+                    PluginCore.DispatchChatToBoxWithPluginIntercept(
+                        $"[MosswartMassacre] Error reading settings, using defaults: {ex.Message}");
+                }
+            }
+
+            if (loaded == null)
+            {
+                // either file didn't exist, was empty, or deserialized as null
+                _instance = new PluginSettings();
+                Save();  // write out default skeleton
             }
             else
             {
-                _instance = new PluginSettings();
-                Save();
+                _instance = loaded;
             }
 
-            // Apply settings to runtime state
+            // apply into runtime
             PluginCore.RareMetaEnabled = _instance.RareMetaEnabled;
             PluginCore.RemoteCommandsEnabled = _instance.RemoteCommandsEnabled;
             PluginCore.HttpServerEnabled = _instance.HttpServerEnabled;
@@ -47,15 +71,30 @@ namespace MosswartMassacre
         }
 
         public static void Save()
+        {
+            lock (_sync)
+            {
+                try
                 {
                     var serializer = new SerializerBuilder()
                         .WithNamingConvention(UnderscoredNamingConvention.Instance)
                         .Build();
+                    var yaml = serializer.Serialize(_instance);
 
-            string yaml = serializer.Serialize(_instance);
-            File.WriteAllText(_filePath, yaml);
+                    // atomic write: write to .tmp then replace
+                    var temp = _filePath + ".tmp";
+                    File.WriteAllText(temp, yaml);
+                    File.Replace(temp, _filePath, null);
+                }
+                catch (Exception ex)
+                {
+                    PluginCore.DispatchChatToBoxWithPluginIntercept(
+                        $"[MosswartMassacre] Error saving settings: {ex.Message}");
+                }
+            }
         }
 
+        // public properties
         public bool RemoteCommandsEnabled
         {
             get => _remoteCommandsEnabled;
@@ -73,15 +112,17 @@ namespace MosswartMassacre
             get => _httpServerEnabled;
             set { _httpServerEnabled = value; Save(); }
         }
-        public string CharTag
-        {
-            get => _charTag;
-            set { _charTag = value; Save(); }
-        }
+
         public bool TelemetryEnabled
         {
             get => _telemetryEnabled;
             set { _telemetryEnabled = value; Save(); }
         }
+
+        public string CharTag
+        {
+            get => _charTag;
+            set { _charTag = value; Save(); }
+        }
     }
 }