from datetime import datetime, timedelta, timezone

from jose import JWTError, jwt
from passlib.context import CryptContext

from app.config import settings

pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")

ALGORITHM = "HS256"


def hash_password(password: str) -> str:
    return pwd_context.hash(password)


def verify_password(plain: str, hashed: str) -> bool:
    return pwd_context.verify(plain, hashed)


def create_access_token(user_id: int) -> str:
    expire = datetime.now(timezone.utc) + timedelta(minutes=settings.JWT_EXPIRE_MINUTES)
    return jwt.encode(
        {"sub": str(user_id), "exp": expire},
        settings.JWT_SECRET_KEY,
        algorithm=ALGORITHM,
    )


def decode_token(token: str) -> int:
    """Decode JWT and return user_id. Raises JWTError on failure."""
    payload = jwt.decode(token, settings.JWT_SECRET_KEY, algorithms=[ALGORITHM])
    user_id = payload.get("sub")
    if user_id is None:
        raise JWTError("Missing sub claim")
    return int(user_id)