add state machine draft

godot/global.gd

@@ -1,11 +1,16 @@
 extends Node
 # https://docs.godotengine.org/en/stable/tutorials/scripting/singletons_autoload.html
 
+signal state_changed(previous, new)
+
+enum State {UNLOADED, LOADED}
+
 const config_path = "user://logue.cfg"
 
 var config = ConfigFile.new()
-var db : SQLite = SQLite.new()
+var db = SQLite.new()
 var current_scene = null
+var current_state = State.UNLOADED
 
 func _ready():
 	var root = get_tree().root
@@ -17,6 +22,15 @@ func _ready():
 	if err == OK:
 		var db_path = config.get_value("general", "db_path")
 		load_db(db_path)
+		
+
+func switch_state(new: State):
+	var old = current_state
+	if old == new:
+		return
+
+	current_state = new
+	#signal state_changed(old, new)
 
 func load_db(path: String):
 	db.path = path