"""Password hashing and JWT issue/verify."""
from datetime import timedelta
from typing import Any, Literal

import bcrypt
import jwt

from app.core.config import settings
from app.core.time import utcnow

ALGORITHM = settings.JWT_ALGORITHM


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:
    try:
        return bcrypt.checkpw(plain.encode("utf-8"), hashed.encode("utf-8"))
    except (ValueError, TypeError):
        return False


def _create_token(subject: str | int, token_type: Literal["access", "refresh"], expires: timedelta,
                  extra: dict[str, Any] | None = None) -> str:
    now = utcnow()
    payload: dict[str, Any] = {
        "sub": str(subject),
        "type": token_type,
        "iat": int(now.timestamp()),
        "exp": int((now + expires).timestamp()),
    }
    if extra:
        payload.update(extra)
    return jwt.encode(payload, settings.SECRET_KEY, algorithm=ALGORITHM)


def create_access_token(user_id: int, role: str) -> str:
    return _create_token(
        user_id,
        "access",
        timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES),
        {"role": role},
    )


def create_refresh_token(user_id: int) -> str:
    return _create_token(user_id, "refresh", timedelta(days=settings.REFRESH_TOKEN_EXPIRE_DAYS))


def decode_token(token: str) -> dict[str, Any]:
    """Raises jwt.PyJWTError on invalid/expired tokens."""
    return jwt.decode(token, settings.SECRET_KEY, algorithms=[ALGORITHM])