from fastapi import Depends, Header, HTTPException, status
from sqlalchemy.orm import Session

from app.core.security import decode_access_token
from app.db import get_db
from app.models import User


def get_current_user(
    authorization: str | None = Header(default=None),
    db: Session = Depends(get_db),
) -> User:
    if not authorization or not authorization.lower().startswith("bearer "):
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Missing bearer token")
    token = authorization.split(" ", 1)[1]
    subject = decode_access_token(token)
    if not subject:
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid token")
    user = db.get(User, int(subject))
    if not user or user.status != "active":
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Inactive or missing user")
    return user


def require_admin(current_user: User = Depends(get_current_user)) -> User:
    role_codes = {role.code for role in current_user.roles}
    if not current_user.is_superuser and role_codes.isdisjoint({"admin", "system_admin"}):
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Admin permission required")
    return current_user