from typing import Optional
import bcrypt, binascii, hashlib, secrets

def hash_password(password: str) -> str:
    return bcrypt.hashpw(password.encode("utf-8"), bcrypt.gensalt(rounds=12)).decode("utf-8")

def verify_password(password: str, hashed: str) -> bool:
    try:
        return bcrypt.checkpw(password.encode("utf-8"), hashed.encode("utf-8"))
    except Exception:
        return False

def verify_legacy_password(password: str, salt_hex: Optional[str], hash_hex: Optional[str]) -> bool:
    if not salt_hex or not hash_hex:
        return False
    salt = binascii.unhexlify(salt_hex.encode())
    dk = hashlib.pbkdf2_hmac("sha256", password.encode("utf-8"), salt, 200_000)
    return secrets.compare_digest(binascii.hexlify(dk).decode(), hash_hex)