from datetime import datetime, timedelta, timezone
from typing import Any, Dict, Optional

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

from .config import settings

_pwd_context = CryptContext(schemes=["pbkdf2_sha256"], deprecated="auto")
_ALGORITHM = "HS256"


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


def verify_password(plain_password: str, hashed_password: str) -> bool:
    return _pwd_context.verify(plain_password, hashed_password)


def create_access_token(subject: str, role: str, expires_minutes: Optional[int] = None) -> str:
    minutes = expires_minutes or settings.jwt_exp_minutes
    expires = datetime.now(timezone.utc) + timedelta(minutes=minutes)
    payload: Dict[str, Any] = {"sub": subject, "role": role, "exp": expires}
    return jwt.encode(payload, settings.jwt_secret, algorithm=_ALGORITHM)


def decode_token(token: str) -> Dict[str, Any]:
    return jwt.decode(token, settings.jwt_secret, algorithms=[_ALGORITHM])


class TokenError(Exception):
    pass


def safe_decode_token(token: str) -> Dict[str, Any]:
    try:
        return decode_token(token)
    except JWTError as exc:
        raise TokenError("Invalid token") from exc