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")


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

    Args:
        subject: The subject of the token, typically the user ID.
        expires_delta: Optional timedelta for token expiration.

    Returns:
        Encoded JWT token as a 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)}

    return jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM)


def verify_password(plain_password: str, hashed_password: str) -> bool:
    """
    Verify if a plain password matches a hashed password.

    Args:
        plain_password: The plain text password.
        hashed_password: The hashed password from the database.

    Returns:
        True if passwords match, False otherwise.
    """
    return pwd_context.verify(plain_password, hashed_password)


def get_password_hash(password: str) -> str:
    """
    Hash a password using the configured password hashing algorithm.

    Args:
        password: The plain text password to hash.

    Returns:
        A hashed password string.
    """
    return pwd_context.hash(password)