from datetime import datetime, timedelta
from typing import Any, Optional, Union

from jose import jwt
from passlib.context import CryptContext

from app.core.config import settings

# Password hashing context
pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")


# Token related functions
def create_access_token(
    subject: Union[str, Any], expires_delta: Optional[timedelta] = None
) -> str:
    """
    Create a JWT access token.

    Args:
        subject: The subject to encode in the JWT (typically user ID)
        expires_delta: Optional timedelta for token expiration

    Returns:
        JWT token as string
    """
    if expires_delta:
        expire = datetime.utcnow() + expires_delta
    else:
        expire = datetime.utcnow() + timedelta(
            minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES
        )

    to_encode = {"exp": expire, "sub": str(subject)}
    encoded_jwt = jwt.encode(
        to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM
    )
    return encoded_jwt


# Password related functions
def verify_password(plain_password: str, hashed_password: str) -> bool:
    """
    Verify a plain password against a hashed password.

    Args:
        plain_password: The plain text password
        hashed_password: The hashed password to compare against

    Returns:
        True if the password matches, False otherwise
    """
    return pwd_context.verify(plain_password, hashed_password)


def get_password_hash(password: str) -> str:
    """
    Generate a password hash from a plain password.

    Args:
        password: The plain text password to hash

    Returns:
        Hashed password string
    """
    return pwd_context.hash(password)