from datetime import UTC, datetime, timedelta

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

from app.core.config import settings

ALGORITHM = "HS256"
pwd_context = CryptContext(schemes=["pbkdf2_sha256"], deprecated="auto")


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) -> str:
    expires_at = datetime.now(UTC) + timedelta(minutes=settings.access_token_expire_minutes)
    payload = {"sub": subject, "exp": expires_at}
    return jwt.encode(payload, settings.infrapulse_secret_key, algorithm=ALGORITHM)


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