from datetime import datetime, timedelta
from typing import Optional
import bcrypt
from jose import jwt
from .config import settings


def hash_password(password: str) -> str:
    # bcrypt has a 72-byte limit; truncate defensively
    pwd_bytes = password.encode("utf-8")[:72]
    return bcrypt.hashpw(pwd_bytes, bcrypt.gensalt(rounds=12)).decode("utf-8")


def verify_password(plain: str, hashed: str) -> bool:
    try:
        pwd_bytes = plain.encode("utf-8")[:72]
        return bcrypt.checkpw(pwd_bytes, hashed.encode("utf-8"))
    except (ValueError, TypeError):
        return False


def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
    to_encode = data.copy()
    expire = datetime.utcnow() + (
        expires_delta or timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
    )
    to_encode["exp"] = expire
    return jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM)


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