from passlib.context import CryptContext
from settings import settings
import jwt
import datetime
import logging

password_context = CryptContext(schemes=["sha256_crypt"], deprecated="auto")
logger = logging.getLogger(__name__)


def hash_password(password: str) -> str:
    """Hashes a plain text password."""
    return password_context.hash(password)


def verify_password(plain_password: str, hashed_password: str) -> bool:
    """Verifies a plain text password against a hashed password."""
    return password_context.verify(plain_password, hashed_password)


def sign_jwt(row: dict) -> str:
    """Signs a JWT token with the given payload."""
    exp = datetime.datetime.now(
        datetime.timezone.utc) + datetime.timedelta(hours=1)

    payload = {
        "id": row["id"],
        "exp": exp
    }

    return jwt.encode(
        payload,
        key=settings.jwt_secret,
        algorithm=settings.jwt_algorithm
    )


def decode_jwt(token: str | None) -> dict | None:
    """Decodes a JWT token and returns the payload."""
    if not token or not token.startswith("Bearer "):
        logger.warning(
            "No token provided or token does not start with 'Bearer '")
        return None

    try:
        payload = jwt.decode(
            token.replace("Bearer ", ""),
            key=settings.jwt_secret,
            algorithms=[settings.jwt_algorithm]
        )

        return payload
    except jwt.ExpiredSignatureError:
        logger.warning("Token has expired")
        return None
    except jwt.InvalidTokenError:
        logger.warning("Invalid token")
        return None

    logger.warning("Unexpected error in token decoding")
    return None