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

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

from app.core.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, expires_delta: Optional[timedelta] = None) -> str:
    expire = datetime.now(timezone.utc) + (
        expires_delta or timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
    )
    payload = {"sub": subject, "exp": expire}
    return jwt.encode(payload, settings.SECRET_KEY, algorithm=ALGORITHM)


def decode_access_token(token: str) -> Optional[str]:
    try:
        payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[ALGORITHM])
        return payload.get("sub")
    except JWTError:
        return None