from fastapi import Depends, HTTPException, status
from fastapi.security import OAuth2PasswordBearer
from jose import jwt
from pydantic import ValidationError
from sqlalchemy.orm import Session

from app import crud, models, schemas
from app.core import security
from app.core.config import settings
from app.db.session import get_db

reusable_oauth2 = OAuth2PasswordBearer(tokenUrl=f"{settings.API_V1_STR}/auth/login/access-token")


def get_current_user(
    db: Session = Depends(get_db), token: str = Depends(reusable_oauth2)
) -> models.User:
    """
    Validate the token and return the current user.
    """
    try:
        payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[security.ALGORITHM])
        token_data = schemas.TokenPayload(**payload)
    except (jwt.JWTError, ValidationError) as e:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="Could not validate credentials",
        ) from e
    user = crud.user.get(db, user_id=token_data.sub)
    if not user:
        raise HTTPException(status_code=404, detail="User not found")
    if not crud.user.is_active(user):
        raise HTTPException(status_code=400, detail="Inactive user")
    return user


def get_current_active_superuser(
    current_user: models.User = Depends(get_current_user),
) -> models.User:
    """
    Validate that the current user is a superuser.
    """
    if not crud.user.is_superuser(current_user):
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="The user doesn't have enough privileges",
        )
    return current_user