import flet as ft
from typing import Any


def send_browser_notification(page: ft.Page, title: str, body: str) -> None:
    """Broadcast a browser notification event to all connected sessions.

    This is typically called from the client (shop) side when a new chat
    is opened or the first message is sent. The actual visual notification
    will be displayed only on admin pages that handle the event.
    """
    if page is None:
        return

    payload: dict[str, Any] = {
        "type": "browser_notification",
        "title": title,
        "body": body,
    }

    # Use PubSub so that admin sessions can react and show a snackbar/toast.
    try:
        # send_all so that any admin pages, and potentially this page, can receive it
        page.pubsub.send_all(payload)
    except Exception:
        # If PubSub is not available, we simply do nothing; email still covers notification.
        pass


def show_local_browser_notification(page: ft.Page, title: str, body: str) -> None:
    """Show a visual notification (snackbar) on the current page for admin users.

    This is intended to be called from admin pages when a `browser_notification`
    event is received via PubSub. It will silently do nothing for non-admin users.
    """
    if page is None:
        return

    user = page.session.get("user") if hasattr(page, "session") else None
    if not user or user.get("role") != "admin":
        # Only admins see these notifications in the browser
        return

    message = f"{title}: {body}" if title else body

    page.snack_bar = ft.SnackBar(
        content=ft.Text(message),
        open=True,
        action="OK",
    )
    page.update()