from fastapi import Depends, HTTPException, status
from fastapi.security import OAuth2PasswordBearer
from jose import JWTError, 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

oauth2_scheme = OAuth2PasswordBearer(tokenUrl=f"{settings.API_V1_STR}/auth/login")


def get_current_user(
    db: Session = Depends(get_db), token: str = Depends(oauth2_scheme)
) -> models.User:
    """
    Validate access token and return current user
    """
    try:
        payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[security.ALGORITHM])
        token_data = schemas.TokenPayload(**payload)
    except (JWTError, ValidationError) as e:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="Could not validate credentials",
        ) from e

    user = crud.user.get(db, id=token_data.sub)
    if not user:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="User not found")
    return user


def get_current_active_user(
    current_user: models.User = Depends(get_current_user),
) -> models.User:
    """
    Check if current user is active
    """
    if not current_user.is_active:
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="Inactive user")
    return current_user


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