import pytest

from target_simulator.gui import sfp_debug_window


def test_sfpdebugwindow_starts_polling(monkeypatch):
    calls = []

    # Replace the after method on the class to capture scheduling attempts
    def fake_after(self, ms, callback):
        calls.append((ms, callback))
        return "fake_after_id"

    monkeypatch.setattr(
        sfp_debug_window.SfpDebugWindow, "after", fake_after, raising=False
    )

    # Instantiate the window (should call after in __init__)
    w = sfp_debug_window.SfpDebugWindow(master=None)

    # Ensure at least one scheduling call was made
    assert calls, "SfpDebugWindow did not schedule the polling loop via after()"

    # Verify that one of the calls uses the configured GUI_POLL_INTERVAL_MS
    assert any(ms == w.GUI_POLL_INTERVAL_MS for ms, _ in calls)

    # Verify that the callback scheduled is the internal _process_latest_payloads method
    assert any(cb == w._process_latest_payloads for _, cb in calls)