diff --git a/extra_books.json b/extra_books.json
new file mode 100644
index 0000000..8685e17
--- /dev/null
+++ b/extra_books.json
@@ -0,0 +1,14 @@
+[
+  {
+    "title": "Json Title 1",
+    "author": "Json Author 1",
+    "year": 2020,
+    "type": "Journal"
+  },
+  {
+    "title": "Json Title 2",
+    "author": "Json Author 3",
+    "year": 2020,
+    "type": "Book"
+  }
+]
\ No newline at end of file
diff --git a/main.py b/main.py
index 94e3a87..2bc6bf1 100644
--- a/main.py
+++ b/main.py
@@ -1,16 +1,161 @@
-# This is a sample Python script.
+import json
+from typing import List
+from pydantic import BaseModel
+from abc import ABC, abstractmethod
 
-# Press ⌃R to execute it or replace it with your code.
-# Press Double ⇧ to search everywhere for classes, files, tool windows, actions, and settings.
+# ps возможно немного заигрался...
 
+def validate_json_path(func):
+    def wrapper(self, *args, **kwargs):
+        if not self.path.endswith(".json"):
+            raise ValueError(f"path must end with '.json'.")
+        return func(self, *args, **kwargs)
+    return wrapper
 
-def print_hi(name):
-    # Use a breakpoint in the code line below to debug your script.
-    print(f'Hi, {name}')  # Press ⌘F8 to toggle the breakpoint.
+def handle_publish(func):
+    def wrapper(*args, **kwargs):
+        result = func(*args, **kwargs)
+        print(f'New Publish: {result}')
+        return result
+    return wrapper
 
+class FileHandler(BaseModel, ABC):
+    path: str
 
-# Press the green button in the gutter to run the script.
-if __name__ == '__main__':
-    print_hi('PyCharm')
+    @abstractmethod
+    def save(self):
+        pass
 
-# See PyCharm help at https://www.jetbrains.com/help/pycharm/
+    @abstractmethod
+    def load(self):
+        pass
+
+class JsonHandler(FileHandler):
+
+    @validate_json_path
+    def save(self, data: any):
+        with open(self.path, 'w') as f:
+            json.dump(data, f)
+
+    @validate_json_path
+    def load(self):
+        with open(self.path, 'r') as f:
+            return json.load(f)
+
+class BookModel(BaseModel, ABC):
+    title: str
+    author: str
+    year: int
+
+    @abstractmethod
+    def get_info(self) -> str:
+        pass
+
+    def __repr__(self) -> str:
+        return self.get_info()
+
+class Book(BookModel):
+
+    def get_info(self):
+        return f"Book(title={self.title!r}, author={self.author!r}, year={self.year!r})"
+
+class Journal(Book):
+
+    def get_info(self):
+        return f"Journal(title={self.title!r}, author={self.author!r}, year={self.year!r})"
+
+class Library(BaseModel):
+    _books: List[Book] = []
+    current_book: int = 0
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        if self.current_book < len(self._books):
+            book = self._books[self.current_book]
+            self.current_book += 1
+            return book
+        else:
+            raise StopIteration
+
+    def delete_item(self, book: Book):
+        self._books.remove(book)
+
+    @handle_publish
+    def add_item(self, book: Book):
+        self._books.append(book)
+        return book
+
+    def get_items(self) -> List[Book]:
+        return self._books
+
+    def get_items_by_author(self, author: str):
+        return list(filter(lambda book: book.author.lower() == author.lower(), self._books))
+
+
+    def save_to_file(self, path: str):
+        j = JsonHandler(path=path)
+        result = []
+
+        # такий ж самий вормат json, як у extra_books
+        for book in self._books:
+            book_json = book.model_dump()
+            book_json['type'] = book.__class__.__name__
+            result.append(book_json)
+
+        j.save(result)
+
+
+    def add_from_file(self, path: str):
+        j = JsonHandler(path=path)
+        data = j.load()
+        for book in data:
+            try:
+                book_type = book.get('type', '').lower()
+                if book_type == 'book':
+                    b = Book(
+                        title=book.get('title', ''),
+                        author=book.get('author', ''),
+                        year=book.get('year', ''),
+                    )
+                    self._books.append(b)
+                elif book_type == 'journal':
+                    j = Journal(
+                        title=book.get('title', ''),
+                        author=book.get('author', ''),
+                        year=book.get('year', ''),
+                    )
+                    self._books.append(j)
+                else:
+                    raise Exception(f'Unknown book type: {book_type}')
+            except Exception as e:
+                print(f'Skipping {book} due to {e}')
+
+# створення бібліотеки
+library = Library()
+
+# створення інстансу книги та журналу
+test_book = Book(title='Book Title', author='Author 1', year=2020)
+test_journal = Journal(title='Journal Title', author='Author 2', year=2020)
+
+# додавання їх у бібліотеку
+library.add_item(test_book)
+library.add_item(test_journal)
+
+print(f"\nвиведення списку книг у бібліотеці \n{library.get_items()}\n")
+
+print(f"виведення списку книг бібліотеки по імені автора \n{library.get_items_by_author('author 1')}\n")
+
+# збереження списку книг у файл
+library.save_to_file('some_file.json')
+
+# видалення книги з бібліотеки
+library.delete_item(test_book)
+
+print(f'виведення списку книг після видалення \n{library.get_items()}\n')
+
+# додавання книг з файлу в бібліотеку
+library.add_from_file('extra_books.json')
+
+print(f'виведення списку книг бібліотеки після додавання p файлу \n{library.get_items()}')
diff --git a/some_file.json b/some_file.json
new file mode 100644
index 0000000..9f5727f
--- /dev/null
+++ b/some_file.json
@@ -0,0 +1 @@
+[{"title": "Book Title", "author": "Author 1", "year": 2020, "type": "Book"}, {"title": "Journal Title", "author": "Author 2", "year": 2020, "type": "Journal"}]
\ No newline at end of file