"""
Session manager mixin for the Agent class.

Contains session management, persistence, and state coordination.
Extracted from agent.py for better modularity and maintainability.
"""

import os
import time
import logging
from typing import Optional, Any, Dict, List, TYPE_CHECKING

if TYPE_CHECKING:
    pass

logger = logging.getLogger(__name__)


class SessionManagerMixin:
    """Mixin providing session management methods for the Agent class.
    
    This mixin handles session lifecycle, persistence, and state coordination
    while keeping session logic separate from other agent concerns.
    """
    
    def _initialize_session(self, session_id: Optional[str] = None) -> str:
        """Initialize a new session or resume an existing one.
        
        Args:
            session_id: Optional session ID to resume
            
        Returns:
            The session ID (new or existing)
        """
        if session_id:
            logger.debug(f"Resuming session: {session_id}")
            return session_id
        
        # Generate new session ID
        timestamp = int(time.time())
        agent_name = (getattr(self, 'name', None) or 'agent').lower().replace(' ', '_')
        new_session_id = f"{agent_name}_{timestamp}"
        
        logger.debug(f"Initialized new session: {new_session_id}")
        return new_session_id
    
    def _save_session_state(self, session_id: str, state: Dict[str, Any]) -> bool:
        """Save session state to persistent storage.
        
        Args:
            session_id: Session identifier
            state: State dictionary to save
            
        Returns:
            True if saved successfully, False otherwise
        """
        try:
            # This is a placeholder implementation
            # In practice, this would integrate with the actual session store
            logger.debug(f"Saving session state for {session_id}: {len(state)} keys")
            return True
        except Exception as e:
            logger.error(f"Failed to save session state: {e}")
            return False
    
    def _load_session_state(self, session_id: str) -> Optional[Dict[str, Any]]:
        """Load session state from persistent storage.
        
        Args:
            session_id: Session identifier
            
        Returns:
            State dictionary if found, None otherwise
        """
        try:
            # This is a placeholder implementation
            # In practice, this would integrate with the actual session store
            logger.debug(f"Loading session state for {session_id}")
            return {}  # Return empty state as placeholder
        except Exception as e:
            logger.error(f"Failed to load session state: {e}")
            return None
    
    def _cleanup_session(self, session_id: str) -> bool:
        """Clean up session resources and optionally persist final state.
        
        Args:
            session_id: Session identifier
            
        Returns:
            True if cleaned up successfully, False otherwise
        """
        try:
            logger.debug(f"Cleaning up session: {session_id}")
            
            # Perform any necessary cleanup
            # This might include saving final state, closing resources, etc.
            
            return True
        except Exception as e:
            logger.error(f"Failed to cleanup session: {e}")
            return False
    
    def _validate_session_state(self, state: Dict[str, Any]) -> bool:
        """Validate session state structure and content.
        
        Args:
            state: State dictionary to validate
            
        Returns:
            True if valid, False otherwise
        """
        if not isinstance(state, dict):
            logger.warning("Session state must be a dictionary")
            return False
        
        # Add any specific validation logic here
        required_keys = []  # Define required keys if needed
        for key in required_keys:
            if key not in state:
                logger.warning(f"Session state missing required key: {key}")
                return False
        
        return True
    
    def _get_session_metadata(self, session_id: str) -> Dict[str, Any]:
        """Get metadata about a session.
        
        Args:
            session_id: Session identifier
            
        Returns:
            Metadata dictionary
        """
        return {
            'session_id': session_id,
            'agent_name': getattr(self, 'name', None) or 'Agent',
            'created_at': time.time(),
            'last_accessed': time.time(),
        }
    
    def _merge_session_context(self, current_context: Dict[str, Any], 
                              session_context: Dict[str, Any]) -> Dict[str, Any]:
        """Merge current context with session context.
        
        Args:
            current_context: Current request context
            session_context: Stored session context
            
        Returns:
            Merged context dictionary
        """
        # Start with session context as base
        merged = session_context.copy() if session_context else {}
        
        # Override with current context (current takes precedence)
        merged.update(current_context)
        
        return merged