Remove unused imports and clean up code structure across multiple files

src/logic/dataclass.py

@@ -2,7 +2,7 @@ import re
 from dataclasses import dataclass, field
 
 from enum import Enum
-
+import json
 
 @dataclass
 class Prof:
@@ -77,23 +77,19 @@ class BookData:
         for key, value in data.items():
             setattr(self, key, value)
 
+    @property
     def to_dict(self):
-        return self.__dict__
+        """Convert the dataclass to a dictionary."""
+        return json.dumps(self.__dict__, ensure_ascii=False)
 
     def from_dataclass(self, dataclass):
         for key, value in dataclass.__dict__.items():
             setattr(self, key, value)
 
     def from_string(self, data: str):
-        if not data.startswith("BookData"):
-            raise ValueError("No valid BookData string")
-        else:
-            pattern = r"(\w+)='([^']*)'"
-            data_dict = dict(re.findall(pattern, data))
-            # print(data_dict)
-        for key, value in data_dict.items():
-            setattr(self, key, value)
-        return self
+        data = json.loads(data)
+
+        return BookData(**data)
 
 
 @dataclass