from __future__ import annotations

from datetime import datetime, timedelta, timezone
from hashlib import sha256
from typing import Any

import bcrypt
from jose import jwt

from app.core.config import settings


def _prehash(password: str) -> bytes:
    # bcrypt truncates at 72 bytes; SHA-256 digest is always 32 bytes
    return sha256(password.encode()).hexdigest().encode()


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


def get_password_hash(password: str) -> str:
    return bcrypt.hashpw(_prehash(password), bcrypt.gensalt()).decode()


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