from fastapi import Depends, HTTPException, status
from fastapi.security import OAuth2PasswordBearer
from jose import JWTError, jwt
from sqlalchemy.orm import Session
from core.database import get_db
from core.config import settings
from models.user import User
from core.security import decode_token

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/auth/login")

async def get_current_user(token: str = Depends(oauth2_scheme), db: Session = Depends(get_db)):
    credentials_exception = HTTPException(
        status_code=status.HTTP_401_UNAUTHORIZED,
        detail="Could not validate credentials",
        headers={"WWW-Authenticate": "Bearer"},
    )
    
    payload = decode_token(token)
    if payload is None:
        raise credentials_exception
        
    email: str = payload.get("sub")
    if email is None:
        raise credentials_exception
        
    user = db.query(User).filter(User.email == email).first()
    if user is None:
        raise credentials_exception
        
    return user