import json
import os
from typing import List, Dict, Any, Optional


class AnswerDataManager:
    """
    A class to handle saving and reading already answered task data to/from a JSON file to avoid calling costly agent twice.
    """
    
    def __init__(self, filename: str = "already_answered.json"):
        """
        Initialize the AnswerDataManager.
        
        Args:
            filename (str): The name of the JSON file to use for storage.
        """
        self.filename = filename
        self.data: List[Dict[str, Any]] = []
    
    def load_data(self) -> List[Dict[str, Any]]:
        """
        Load data from the JSON file.
        
        Returns:
            List[Dict[str, Any]]: The loaded data, or empty list if file doesn't exist.
        """
        try:
            if os.path.exists(self.filename):
                with open(self.filename, 'r', encoding='utf-8') as f:
                    self.data = json.load(f)
            else:
                self.data = []
        except (json.JSONDecodeError, IOError) as e:
            print(f"Error loading data from {self.filename}: {e}")
            self.data = []
        
        return self.data
    
    def save_data(self, data: Optional[List[Dict[str, Any]]] = None) -> bool:
        """
        Save data to the JSON file.
        
        Args:
            data (Optional[List[Dict[str, Any]]]): Data to save. If None, saves current self.data.
        
        Returns:
            bool: True if successful, False otherwise.
        """
        if data is not None:
            self.data = data
        
        try:
            with open(self.filename, 'w', encoding='utf-8') as f:
                json.dump(self.data, f, indent=4, ensure_ascii=False)
            return True
        except IOError as e:
            print(f"Error saving data to {self.filename}: {e}")
            return False
    
    def add_answer(self, task_id: str, question: str, submitted_answer: str) -> bool:
        """
        Add a new answer to the data structure.
        
        Args:
            task_id (str): The task identifier.
            question (str): The question text.
            submitted_answer (str): The submitted answer.
        
        Returns:
            bool: True if successful, False otherwise.
        """
        new_answer = {
            "task_id": task_id,
            "question": question,
            "submitted_answer": submitted_answer
        }
        
        self.data.append(new_answer)
        return self.save_data()
    
    def get_answer_by_task_id(self, task_id: str) -> Optional[Dict[str, Any]]:
        """
        Retrieve an answer by task ID.
        
        Args:
            task_id (str): The task identifier to search for.
        
        Returns:
            Optional[Dict[str, Any]]: The answer data if found, None otherwise.
        """
        for answer in self.data:
            if answer.get("task_id") == task_id:
                return answer
        return None
    
    def update_answer(self, task_id: str, question: str = None, submitted_answer: str = None) -> bool:
        """
        Update an existing answer by task ID.
        
        Args:
            task_id (str): The task identifier.
            question (str, optional): New question text.
            submitted_answer (str, optional): New submitted answer.
        
        Returns:
            bool: True if successful, False if task_id not found.
        """
        for answer in self.data:
            if answer.get("task_id") == task_id:
                if question is not None:
                    answer["question"] = question
                if submitted_answer is not None:
                    answer["submitted_answer"] = submitted_answer
                return self.save_data()
        return False
    
    def remove_answer(self, task_id: str) -> bool:
        """
        Remove an answer by task ID.
        
        Args:
            task_id (str): The task identifier to remove.
        
        Returns:
            bool: True if successful, False if task_id not found.
        """
        original_length = len(self.data)
        self.data = [answer for answer in self.data if answer.get("task_id") != task_id]
        
        if len(self.data) < original_length:
            return self.save_data()
        return False
    
    def get_all_answers(self) -> List[Dict[str, Any]]:
        """
        Get all answers in the current data structure.
        
        Returns:
            List[Dict[str, Any]]: All answer data.
        """
        return self.data.copy()
    
    def clear_all_data(self) -> bool:
        """
        Clear all data from memory and file.
        
        Returns:
            bool: True if successful, False otherwise.
        """
        self.data = []
        return self.save_data()