from fastapi import Depends, HTTPException, status
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from jose import JWTError, jwt
from sqlalchemy.orm import Session
from app.core.config import settings
from app.crud import user as user_crud
from app.db.session import get_db
from app.models.user import User

security = HTTPBearer()


def get_current_user(
    db: Session = Depends(get_db),
    credentials: HTTPAuthorizationCredentials = Depends(security),
) -> User:
    credentials_exception = HTTPException(
        status_code=status.HTTP_401_UNAUTHORIZED,
        detail="Could not validate credentials",
        headers={"WWW-Authenticate": "Bearer"},
    )
    try:
        payload = jwt.decode(
            credentials.credentials,
            settings.SECRET_KEY,
            algorithms=[settings.ALGORITHM],
        )
        email: str = payload.get("sub")
        if email is None:
            raise credentials_exception
    except JWTError:
        raise credentials_exception

    user = user_crud.get_by_email(db, email=email)
    if user is None:
        raise credentials_exception
    return user


def get_current_active_user(current_user: User = Depends(get_current_user)) -> User:
    if not user_crud.is_active(current_user):
        raise HTTPException(status_code=400, detail="Inactive user")
    return current_user


def get_current_active_superuser(
    current_user: User = Depends(get_current_user),
) -> User:
    if not user_crud.is_superuser(current_user):
        raise HTTPException(
            status_code=400, detail="The user doesn't have enough privileges"
        )
    return current_user