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

import bcrypt
import jwt

from config import settings

BCRYPT_ROUNDS = 12


def _truncate(pw: str) -> bytes:
    return pw.encode("utf-8")[:72]


def hash_password(password: str) -> str:
    return bcrypt.hashpw(_truncate(password), bcrypt.gensalt(rounds=BCRYPT_ROUNDS)).decode()


def verify_password(plain: str, hashed: str) -> bool:
    try:
        return bcrypt.checkpw(_truncate(plain), hashed.encode())
    except (ValueError, TypeError):
        return False


def create_access_token(subject: str | int, extra: Optional[dict] = None) -> str:
    now = datetime.now(timezone.utc)
    payload = {
        "sub": str(subject),
        "iat": int(now.timestamp()),
        "exp": int((now + timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)).timestamp()),
    }
    if extra:
        payload.update(extra)
    return jwt.encode(payload, settings.SECRET_KEY, algorithm=settings.ALGORITHM)


def decode_token(token: str) -> dict:
    return jwt.decode(token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM])