"""Генерация QR (SVG) без Pillow — только пакет qrcode."""

from __future__ import annotations

import io

import qrcode
import qrcode.image.svg


def make_qr_svg(data: str, *, scale: int = 4, border: int = 2) -> bytes:
    """Возвращает SVG QR как bytes (image/svg+xml)."""
    text = (data or "").strip()
    if not text:
        raise ValueError("empty qr data")
    factory = qrcode.image.svg.SvgPathImage
    img = qrcode.make(
        text,
        error_correction=qrcode.constants.ERROR_CORRECT_M,
        box_size=max(2, int(scale)),
        border=max(1, int(border)),
        image_factory=factory,
    )
    buf = io.BytesIO()
    img.save(buf)
    return buf.getvalue()