"""JWT token generation and validation."""
from datetime import datetime, timedelta
from typing import Optional
from uuid import UUID

from jose import JWTError, jwt

from app.core.config import settings


def create_access_token(user_id: UUID, email: str, expires_delta: Optional[timedelta] = None) -> str:
    """
    Create a new JWT access token.
    
    Args:
        user_id: User's UUID
        email: User's email address
        expires_delta: Optional custom expiration time
        
    Returns:
        Encoded JWT token string
    """
    if expires_delta:
        expire = datetime.utcnow() + expires_delta
    else:
        expire = datetime.utcnow() + timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
    
    to_encode = {
        "sub": str(user_id),
        "email": email,
        "exp": expire,
        "iat": datetime.utcnow(),
        "type": "access"
    }
    
    encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM)
    return encoded_jwt


def decode_access_token(token: str) -> Optional[dict]:
    """
    Decode and validate a JWT access token.
    
    Args:
        token: JWT token string to decode
        
    Returns:
        Decoded token payload if valid, None otherwise
    """
    try:
        payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM])
        return payload
    except JWTError:
        return None