import qrcode
from pathlib import Path
from flask import current_app, url_for

from app.utils.paths import event_qr_folder


def generate_qr_for_guest(guest, base_url=None):
    """Генерирует QR-код для гостя и сохраняет его в папку мероприятия."""
    token = guest.token
    qr_folder = event_qr_folder(guest.event_id)
    qr_folder.mkdir(parents=True, exist_ok=True)

    qr_filename = f"{token}.png"
    qr_path = qr_folder / qr_filename

    # URL, который будет закодирован в QR
    if base_url is None:
        configured_base_url = (current_app.config.get("BASE_URL") or "").rstrip("/")
        if configured_base_url:
            check_in_url = f"{configured_base_url}/check-in?token={token}"
        else:
            try:
                check_in_url = url_for("main.check_in", token=token, _external=True)
            except Exception:
                check_in_url = f"http://localhost:5000/check-in?token={token}"
    else:
        check_in_url = f"{base_url.rstrip('/')}/check-in?token={token}"

    qr = qrcode.QRCode(
        version=1,
        error_correction=qrcode.constants.ERROR_CORRECT_H,
        box_size=10,
        border=4,
    )
    qr.add_data(check_in_url)
    qr.make(fit=True)

    img = qr.make_image(fill_color="black", back_color="white")
    img.save(str(qr_path))

    guest.qr_filename = qr_filename
    return qr_path, check_in_url