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.core.config import settings
from app.db.session import get_db
from app.models.user import User
from app.schemas.token import TokenPayload

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),
) -> User:
    """
    Get the current user from the token.
    """
    try:
        payload = jwt.decode(
            token, settings.JWT_SECRET_KEY, algorithms=[settings.JWT_ALGORITHM],
        )
        token_data = TokenPayload(**payload)
    except (JWTError, ValidationError):
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Could not validate credentials",
            headers={"WWW-Authenticate": "Bearer"},
        )
    user = db.query(User).filter(User.id == token_data.sub).first()
    if not user:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND, detail="User not found",
        )
    if not user.is_active:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST, detail="Inactive user",
        )
    return user


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


def get_current_admin_user(
    current_user: User = Depends(get_current_user),
) -> User:
    """
    Get the current admin user.
    """
    if not current_user.is_admin:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN, detail="Not enough permissions",
        )
    return current_user