"""Send/readback wiring for the light sliders (was a __main__ self-check in
the panel; promoted here so CI counts it). Every deliberate input path must
emit, and the status-poll readback must neither clobber a fresh user change
nor echo a PUT back to the server."""

import time
from types import SimpleNamespace

import pytest
from PySide6.QtCore import QPoint, QPointF, Qt
from PySide6.QtGui import QWheelEvent
from PySide6.QtWidgets import QApplication

from aare.gui.panels.illumination_panel import READBACK_GRACE_S, IlluminationPanel


@pytest.fixture
def panel(qtbot):
    panel = IlluminationPanel()
    qtbot.addWidget(panel)
    return panel


def _wheel_notch(slider):
    # One wheel notch; sliderReleased never fires for this path, which is
    # exactly the case the valueChanged wiring exists for.
    QApplication.sendEvent(
        slider,
        QWheelEvent(
            QPointF(5, 5),
            QPointF(5, 5),
            QPoint(0, 0),
            QPoint(0, 120),
            Qt.MouseButton.NoButton,
            Qt.KeyboardModifier.NoModifier,
            Qt.ScrollPhase.NoScrollPhase,
            False,
        ),
    )


def _status(front=90.0, back=10.0):
    return SimpleNamespace(bl=SimpleNamespace(front_light=front, back_light=back))


def test_wheel_notch_emits_both_lights(panel):
    front, back = [], []
    panel.front_light.connect(front.append)
    panel.back_light.connect(back.append)
    _wheel_notch(panel.front_light_slider)
    _wheel_notch(panel.back_light_slider)
    assert front, "wheel adjustment must emit front_light"
    assert back, "wheel adjustment must emit back_light"


def test_readback_grace_holds_user_value(panel):
    _wheel_notch(panel.front_light_slider)
    held = panel.front_light_slider.value()
    panel.update_daq_status(_status())
    assert panel.front_light_slider.value() == held, "grace window must hold user value"


def test_readback_applies_after_grace_without_echo(panel):
    sent = []
    panel.front_light.connect(sent.append)
    panel._last_user_change = time.monotonic() - READBACK_GRACE_S - 1
    panel.update_daq_status(_status())
    assert panel.front_light_slider.value() == 90, "readback must apply after grace"
    assert panel.back_light_slider.value() == 10
    assert not sent, "readback must not echo a PUT"


def test_readback_skipped_while_sliding(panel):
    panel.on_slider_pressed()
    panel._last_user_change = 0.0
    panel.update_daq_status(_status(front=55.0))
    assert panel.front_light_slider.value() != 55
    panel.on_slider_released()
    panel.update_daq_status(_status(front=55.0))
    assert panel.front_light_slider.value() == 55