class Storage:
    def __init__(self):
        self.categories = []
        self.topics = []
        self.documents = []
        
    def add_category(self, category: Category):
        if category in self.categories:
            return
        self.categories.append(category)
        
        
    def add_topic(self, topic:Topic):
        if topic in self.topics:
            return
        self.topics.append(topic)
        
        
    def add_document(self, document: Document):
        if document in self.documents:
            return
        self.documents.append(document)
        
    
    def edit_category(self, category_id, new_name):
        category = self.__find_my_id(self.categories, category_id)
        category.edit(new_name)
        
    def edit_topic(self, topic_id: int, new_topic: str, new_storage_folder: str):
        topic = self.__find_my_id(self.topics, topic_id)
        topic.edit(new_topic, new_storage_folder)
        
    def edit_document(self, document_id: int, new_file_name: str):
        document = self.__find_my_id(self.documents, document_id)
        document.edit(new_file_name)
        
    def delete_category(self, category_id):
        category = self.__find_my_id(self.categories, category_id)
        self.categories.remove(category)
        
    def delete_topic(self, topic_id):
        topic = self.__find_my_id(self.topics, topic_id)
        self.topics.remove(topic)
        
    def delete_document(self, document_id):
        document = self.__find_my_id(self.documents, document_id)
        self.topics.remove(document)
        
    def get_document(self, ):
        return self.__find_my_id(self.document, document_id)
        
    def __repr__(self):
        return "\n".join([repr(x) for x in self.documents])
    
    
    
    def __find_my_id(self, entities, entity_id):
        for entity in entities:
            if entity.id = entity_id:
                return entity