from __future__ import annotations

from datetime import datetime, timedelta, timezone
from typing import Any, Dict

from jose import JWTError, jwt
from passlib.context import CryptContext

from backend.app.core.config import get_settings

pwd_context = CryptContext(schemes=["pbkdf2_sha256"], deprecated="auto")


def verify_password(plain_password: str, hashed_password: str) -> bool:
    return pwd_context.verify(plain_password, hashed_password)


def get_password_hash(password: str) -> str:
    return pwd_context.hash(password)


def create_access_token(subject: str, expires_delta: timedelta | None = None) -> str:
    settings = get_settings()
    expire = datetime.now(timezone.utc) + (
        expires_delta or timedelta(minutes=settings.access_token_expire_minutes)
    )
    to_encode: Dict[str, Any] = {"sub": subject, "exp": expire}
    return jwt.encode(
        to_encode, settings.jwt_secret_key, algorithm=settings.jwt_algorithm
    )


def decode_access_token(token: str) -> Dict[str, Any]:
    settings = get_settings()
    try:
        return jwt.decode(
            token, settings.jwt_secret_key, algorithms=[settings.jwt_algorithm]
        )
    except (
        JWTError
    ) as exc:  # pragma: no cover - specific error mapping handled by caller
        raise ValueError("Invalid token") from exc