from datetime import datetime, timedelta, timezone

import bcrypt
import jwt

from app.config import settings


def hash_password(password: str) -> str:
    return bcrypt.hashpw(password.encode(), bcrypt.gensalt()).decode()


def verify_password(plain_password: str, hashed_password: str) -> bool:
    return bcrypt.checkpw(plain_password.encode(), hashed_password.encode())


def create_access_token(data: dict) -> str:
    to_encode = data.copy()
    expire = datetime.now(timezone.utc) + timedelta(minutes=settings.access_token_expire_minutes)
    to_encode.update({"exp": expire})
    return jwt.encode(to_encode, settings.secret_key, algorithm=settings.algorithm)


def decode_access_token(token: str) -> dict | None:
    """Декодирует JWT-токен. Возвращает payload или None при ошибке."""
    try:
        return jwt.decode(token, settings.secret_key, algorithms=[settings.algorithm])
    except jwt.PyJWTError:
        return None