from datetime import datetime, timedelta
from typing import Optional

import bcrypt
from jose import JWTError, jwt

from app.core.config import settings


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


def verify_password(plain: str, hashed: str) -> bool:
    return bcrypt.checkpw(plain.encode("utf-8"), hashed.encode("utf-8"))


def create_access_token(subject: int) -> str:
    expire = datetime.utcnow() + timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
    return jwt.encode(
        {"sub": str(subject), "exp": expire, "type": "access"},
        settings.SECRET_KEY,
        algorithm=settings.ALGORITHM,
    )


def create_refresh_token(subject: int) -> str:
    expire = datetime.utcnow() + timedelta(days=settings.REFRESH_TOKEN_EXPIRE_DAYS)
    return jwt.encode(
        {"sub": str(subject), "exp": expire, "type": "refresh"},
        settings.SECRET_KEY,
        algorithm=settings.ALGORITHM,
    )


def decode_token(token: str) -> Optional[int]:
    try:
        payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM])
        return int(payload["sub"])
    except (JWTError, KeyError, ValueError):
        return None