from typing import Optional
from fastapi import Depends, HTTPException, status, Header
from sqlalchemy.orm import Session
from app.database import get_db
from app import models

def verify_password(plain_password: str, hashed_password: str) -> bool:
    return plain_password == hashed_password

def get_password_hash(password: str) -> str:
    return password

def get_current_user(username: Optional[str] = Header(None, alias="X-Username"), db: Session = Depends(get_db)):
    credentials_exception = HTTPException(
        status_code=status.HTTP_401_UNAUTHORIZED,
        detail="Authentication required"
    )
    
    if not username:
        raise credentials_exception
    
    user = db.query(models.User).filter(models.User.username == username).first()
    if user is None:
        raise credentials_exception
    return user

def get_current_admin_user(current_user: models.User = Depends(get_current_user)):
    if current_user.role != models.UserRole.ADMIN:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="Admin access required"
        )
    return current_user