orisys-app/apps/studio/tests/test_ui_smoke.py

"""Offscreen UI smoke tests: construction, layout adaptation, theme tokens."""

from __future__ import annotations

from pathlib import Path

import numpy as np
import pytest
import ui_check
from tests.conftest import (
    finish_run as _finish,
)
from tests.conftest import (
    running_window as _running_window,
)
from tests.conftest import (
    show_window as _show,
)
from tests.conftest import (
    visible_descendants,
)

RESOLUTIONS = ((1280, 720), (1600, 900), (1920, 1080))


@pytest.mark.parametrize(("theme", "sensor_type"), [
    ("dark", "box"),
    ("light", "box"),
    ("dark", "finger"),
    ("light", "finger"),
])
def test_window_builds_in_every_theme(make_window, theme, sensor_type):
    window = _show(make_window(theme=theme, sensor_type=sensor_type), (1400, 880))
    assert window.windowTitle()
    assert window.content_splitter.count() == 4


@pytest.mark.parametrize("size", RESOLUTIONS)
def test_panels_fit_within_window(make_window, size):
    window = _show(
        make_window(sensor_type="finger", show_cal_panel=True),
        size,
    )
    sizes = window.content_splitter.sizes()
    panels = [
        window.mesh3d_panel,
        window.arrow_panel,
        window.force_plots,
        window.cal_panel,
    ]
    for panel, width in zip(panels, sizes):
        assert panel.isVisible()
        assert width >= panel.minimumWidth(), (
            f"{panel.objectName() or type(panel).__name__} too narrow: {width}"
        )
    assert window.force_plots.width() >= window.force_plots.minimumWidth()
    assert window.arrow_panel.width() >= window.arrow_panel.minimumWidth()


@pytest.mark.parametrize("size", RESOLUTIONS)
def test_children_stay_inside_their_parent(make_window, size):
    window = _show(make_window(sensor_type="finger", show_cal_panel=True), size)
    oversize = []
    for child in visible_descendants(window):
        if ui_check._inside_scroll_area(child):
            # A scroll area's content is *meant* to exceed its viewport: the
            # calibration panel and the settings area scroll instead of
            # squeezing their controls into an unreadable width.
            continue
        parent = child.parentWidget()
        if parent is None or not parent.isVisible():
            continue
        geometry = child.geometry()
        if geometry.width() > parent.width() + 1 or geometry.height() > parent.height() + 1:
            oversize.append(
                f"{type(child).__name__} {geometry.width()}x{geometry.height()}"
                f" > parent {parent.width()}x{parent.height()}"
            )
    assert not oversize, oversize


def test_theme_tokens_have_identical_keys():
    from orisys_app_shared.theme import build_qss, load_colors

    dark = set(load_colors("dark"))
    light = set(load_colors("light"))
    assert dark == light, {"dark_only": sorted(dark - light), "light_only": sorted(light - dark)}
    assert len(build_qss("dark")) > 1000
    assert len(build_qss("light")) > 1000


def test_arrow_canvas_differs_from_accent():
    """The pure-color arrow canvas must not collide with the accent pen color."""
    from orisys_app_shared.theme import load_colors

    for theme in ("dark", "light"):
        colors = load_colors(theme)
        assert colors["arrow_canvas"] != colors["accent"], theme


def test_palette_rules_hold():
    """WCAG contrast and colour-separation rules from ``tools/ui_check.py``."""
    import ui_check

    assert ui_check.audit_palette() == []


def test_flow_colormap_follows_the_theme_ramp():
    from orisys_app_shared.acquisition.arrows import (
        _lut_from_ramp,
        flow_colormap,
        hex_to_bgr,
    )
    from orisys_app_shared.theme import load_colors

    for theme in ("dark", "light"):
        stops = [s.strip() for s in load_colors(theme)["flow_ramp"].split(",")]
        lut = flow_colormap(theme)
        assert lut.shape == (256, 1, 3)
        assert tuple(int(v) for v in lut[0, 0]) == hex_to_bgr(stops[0])
        assert tuple(int(v) for v in lut[-1, 0]) == hex_to_bgr(stops[-1])

    # Malformed ramps must never raise; they fall back to the built-in ramp.
    fallback = _lut_from_ramp("not,a,ramp")
    assert fallback.shape == (256, 1, 3)


def test_brand_bar_renders_and_localizes(make_window):
    from orisys_app_shared.i18n import t

    window = _show(make_window(language="zh_CN"), (1440, 880))
    bar = window.brand_bar
    assert bar.height() >= 28
    assert bar.name.text()
    assert bar.product.text() == t("app.title")

    zh_tagline = bar.tagline.text()
    window._set_language("en_US")
    assert bar.tagline.text() != zh_tagline
    assert bar.name.text() == "ORISYS"

    logo = bar.logo.pixmap()
    if logo is not None and not logo.isNull():
        image = logo.toImage()
        alphas = [
            image.pixelColor(x, y).alpha()
            for y in range(image.height())
            for x in range(image.width())
        ]
        assert any(a < 32 for a in alphas)
        assert any(a >= 200 for a in alphas)


def test_brand_bar_background_comes_from_tokens(make_window):
    from orisys_app_shared.theme import load_colors

    window = _show(make_window(), (1440, 880))
    for theme in ("dark", "light"):
        window._set_theme(theme)
        colors = load_colors(theme)
        assert colors["brand_bar_bg"] != colors["window_bg"], theme
        assert window.brand_bar._theme == theme


def test_disabled_buttons_use_muted_text_not_hover_background():
    from orisys_app_shared.theme import build_qss, load_colors

    for theme in ("dark", "light"):
        colors = load_colors(theme)
        qss = build_qss(theme)
        assert f"color: {colors['text_muted']}" in qss, theme
        # The old rule painted disabled buttons with the brighter hover color.
        assert f"background-color: {colors['button_hover']};\n    border-color: {colors['panel_border']}" not in qss


def test_splitter_sizes_round_trip_through_prefs(make_window):
    window = _show(make_window(), (1440, 880))
    window.content_splitter.setSizes([300, 420, 520, 0])
    window._persist_prefs()
    stored = window.prefs["splitter_sizes"]
    assert len(stored) == 4
    assert stored[2] > stored[0]


def test_status_chip_tracks_phase(make_window):
    window = _show(make_window(), (1400, 880))
    assert window._session_phase == "idle"
    window._set_phase("running")
    assert window.status_chip.text()
    assert "status_running" not in window.status_chip.text()
    window._set_phase("nonexistent-phase")
    assert window._session_phase == "idle"


def test_run_tooltip_explains_disabled_reason(make_window):
    window = _show(make_window(source_mode="video", video_path=""), (1400, 880))
    assert not window.toolbar.btn_run.isEnabled()
    assert window.toolbar.btn_run.toolTip()

    window.toolbar.set_video_path("C:/tmp/demo.mp4")
    window._update_run_enabled()
    assert window.toolbar.btn_run.isEnabled()


def test_toolbar_run_button_is_labelled(make_window):
    window = _show(make_window(), (1400, 880))
    label = window.toolbar.btn_run.text()
    assert label.strip()
    assert label != "â–¶"
    window.toolbar.set_run_checked(True)
    assert window.toolbar.btn_run.text() != label


@pytest.mark.parametrize("cancel_via", ("toolbar", "escape"))
def test_a_hung_connect_can_be_cancelled_immediately(make_window, cancel_via):
    """Both cancellation paths stay responsive while a device is connecting."""
    import time

    import ui_check
    from orisys_app_shared.i18n import t

    window = _show(make_window(sensor_type="box", source_mode="camera"), (1440, 880))
    stuck = ui_check._StuckWorker()
    window._ensure_workers = lambda: None
    window._box_worker = stuck
    window._finger_worker = stuck

    window.toolbar.btn_run.setChecked(True)
    assert window._session_phase == "connecting"
    try:
        if cancel_via == "toolbar":
            assert window.toolbar.btn_stop.isEnabled(), "Stop is disabled while connecting"
            assert window.toolbar.btn_stop.text() == t("toolbar.cancel_label")
            assert window.act_stop.isEnabled()
            cancel = window.toolbar.btn_stop.click
        else:
            assert window.act_stop.shortcut().toString() == "Esc"
            cancel = window._on_stop_shortcut

        started = time.perf_counter()
        cancel()
        elapsed = time.perf_counter() - started
        assert elapsed < 0.5, f"{cancel_via} cancellation blocked for {elapsed:.2f}s"
        assert not window._running
        assert stuck.thread_still_owned, "Stop abandoned the still-running worker thread"
    finally:
        stuck.release()


def test_theme_switch_updates_panels(make_window):
    window = _show(make_window(), (1400, 880))
    window._set_theme("light")
    assert window._theme == "light"
    window._set_theme("dark")
    assert window._theme == "dark"


def test_cal_panel_records_and_lists_samples(make_window):
    window = _show(make_window(), (1400, 880))
    cal = window.cal_panel
    cal.set_running(True)
    assert cal.btn_record.isEnabled()
    assert cal.btn_record.text()
    assert cal.table.columnCount() == 6, "the diagnostic columns changed"

    _add_calibration_point(window, load=1.0, raw=100.2)
    _add_calibration_point(window, load=2.0, raw=400.0)  # off-trend
    _add_calibration_point(window, load=3.0, raw=300.6)
    assert cal.table.rowCount() == 3
    assert not cal.empty_hint.isVisible()

    headers = [
        cal.table.horizontalHeaderItem(i).text() for i in range(cal.table.columnCount())
    ]
    from orisys_app_shared.i18n import t

    assert headers == [
        t("cal.col_weight"),
        t("cal.col_fn"),
        t("cal.col_fx"),
        t("cal.col_fy"),
        t("cal.col_stability"),
        t("cal.col_state"),
    ]


def _add_calibration_point(window, *, load: float, raw: float, samples: int = 40):
    """Drive one point through the recorder and into the panel's table."""
    from orisys_app_shared.force.session import SessionSample

    window.cal_recorder.start(channel="fn", reference_load_n=load, duration_s=1.0)
    for index in range(samples):
        window.cal_recorder.feed(
            SessionSample(
                frame_id=index,
                t_rel_s=index / 100.0,
                fn_raw=raw,
                fx_raw=0.4,
                fy_raw=-0.2,
                valid=True,
            )
        )
    point = window.cal_recorder.finish_now()
    window.cal_panel.on_record_finished(point)
    return point


def test_calibration_diagnostics_drive_the_fit(make_window):
    """The diagnostics must describe the model that would be exported.

    The export builds a piecewise-linear curve, which passes through every point
    it is built from — so the training residual is zero by construction and an
    off-trend point can only show up as a *validation* error. A private
    least-squares residual would have described a model nobody applies.
    """
    window = _show(make_window(), (1400, 880))
    window.cal_panel.set_running(True)
    _add_calibration_point(window, load=1.0, raw=100.2)
    _add_calibration_point(window, load=2.0, raw=400.0)
    _add_calibration_point(window, load=3.0, raw=300.6)
    _add_calibration_point(window, load=5.0, raw=500.9)

    recorder = window.cal_recorder
    fit = recorder.fit("fn")
    assert fit.usable and fit.n_points == 4
    assert fit.method == "piecewise_linear", fit.method
    assert fit.breakpoints == 4, fit.breakpoints
    assert fit.max_residual_n <= 1e-9, "the exported model misses its own points"
    assert window.cal_panel.fit_label.text()

    # Hold the off-trend point (load 2.0 at raw 400) out: the exported model is
    # then built without it and the misfit is measurable.
    window.cal_panel.table.setCurrentCell(1, 0)
    window.cal_panel._on_toggle_validation()
    held_out = recorder.fit("fn")
    assert held_out.validation_points == 1
    assert held_out.validation_error_n > 0.05, held_out.validation_error_n
    assert recorder.points[1].is_validation
    assert np.isnan(recorder.points[1].residual_n), "validation point entered the fit"

    window.cal_panel._on_toggle_validation()
    window.cal_panel._on_toggle_excluded()
    assert recorder.points[1].excluded
    # An excluded point leaves the export store but stays on record.
    assert len(window.cal_panel._store.channel("fn")) == 3

    # The exported model no longer passes through the excluded point.
    from orisys_app_shared.force.calibration_io import (
        build_export_model,
        predict_channel,
    )

    store = window.cal_panel._store
    model = build_export_model({key: store.channel(key) for key in ("fn", "fx", "fy")})
    assert abs(predict_channel(model, "fn", 400.0) - 2.0) > 0.05

    # The store, the label and the export are the same preparation: the panel
    # must not derive the model twice and show numbers for one of them.
    prepared = window.cal_panel._prepared
    assert prepared is not None and prepared.ok
    assert list(store.channel("fn")) == list(prepared.samples["fn"])
    assert prepared.points_in_fit("fn") == 3


def test_the_panel_shows_the_numbers_of_the_file_it_exports(make_window, record_root):
    """Displayed diagnostics must match the written coefficients.

    A repeated reference load makes this sharp: the two samples of one load must
    be merged before the build, so the exported curve and the panel's residual
    and validation figures all come from that single prepared model.
    """
    import json
    from pathlib import Path

    import orisys.calibration as sdk_calibration
    from orisys_app_shared.force.calibration_io import build_force_calibration_v2

    window = _show(make_window(), (1400, 880))
    window.cal_panel.set_running(True)
    window.cal_panel.set_meta_context(sensor_type="box", config_ref=None)
    _add_calibration_point(window, load=1.0, raw=100.0)
    _add_calibration_point(window, load=2.0, raw=200.0)
    _add_calibration_point(window, load=2.0, raw=240.0)  # a deliberate repeat
    _add_calibration_point(window, load=4.0, raw=400.0)
    _add_calibration_point(window, load=3.0, raw=290.0)

    panel = window.cal_panel
    panel.table.setCurrentCell(4, 0)
    panel._on_toggle_validation()
    panel._rebuild_store()
    panel._refresh_fit_label()
    prepared = panel._prepared
    assert prepared is not None and prepared.ok
    assert len(prepared.samples["fn"]) == 3, "the repeated load was not merged"

    # Write the document the export would write, load it back with the SDK and
    # check that its predictions are the prepared ones.
    document, _warnings = build_force_calibration_v2(prepared)
    path = Path(record_root) / "force_calibration.json"
    path.write_text(json.dumps(document), encoding="utf-8")
    loaded = sdk_calibration.load(path, strict=True)

    for point in window.cal_recorder.points:
        raw = float(point.loaded_stats().mean)
        predicted = float(loaded.get("fn").convert(raw))
        assert predicted == pytest.approx(prepared.predict("fn", raw), abs=1e-9)

    # ...and the label describes that same model.
    label = panel.fit_label.text()
    assert "分段线性" in label or "piecewise" in label, label
    assert "3" in label
    assert prepared.max_validation_error("fn") > 0.0


def test_calibration_point_dialog_shows_three_axes(make_window):
    window = _show(make_window(), (1400, 880))
    _add_calibration_point(window, load=1.0, raw=100.2)
    point = window.cal_recorder.points[0]
    assert set(point.trace) == {"fn", "fx", "fy"}
    assert point.trace_dt_s > 0

    from orisys_studio.ui.cal_point_dialog import CalibrationPointDialog

    dialog = CalibrationPointDialog(point, theme="dark")
    assert dialog.windowTitle()
    assert len(dialog.plot_widget.ci.items) == 3, "not one trace per axis"
    dialog.close()


def _write_session_file(root, *, sensor_type, sn, config_ref, points):
    import json

    from orisys_app_shared.force.calibration_session import build_session_document

    document = build_session_document(
        points,
        meta={"sensor_type": sensor_type, "sn": sn, "config_ref": config_ref},
    )
    path = Path(root) / f"calibration_session_{sensor_type}.json"
    path.write_text(json.dumps(document), encoding="utf-8")
    return path


def test_opening_device_a_record_keeps_device_a_identity(make_window, record_root):
    """Device A's record must not be restamped with device B's identity."""
    import json
    from unittest.mock import patch as _patch

    import orisys_studio.ui.cal_panel as cal_panel_module
    from orisys_app_shared.force.calibration_io import build_force_calibration_v2

    window = _show(make_window(), (1400, 880))
    panel = window.cal_panel
    # A record taken on device A, with a full audit series.
    session_points = [
        _add_calibration_point(window, load=1.0, raw=100.0),
        _add_calibration_point(window, load=3.0, raw=300.0),
    ]
    source = _write_session_file(
        record_root,
        sensor_type="box",
        sn="SN-A",
        config_ref="D:/lab/deviceA/sensor.json",
        points=session_points,
    )
    window.cal_recorder.clear_points()

    # ...and the live context is device B.
    panel.set_meta_context(sensor_type="finger", config_ref="D:/lab/deviceB/sensor.json")
    panel.sn_edit.setText("SN-B")

    panel._on_open_record(str(source))
    assert panel.sn_edit.text() == "SN-A", "the record's SN was overwritten"
    meta = panel._export_meta()
    assert meta["sensor_type"] == "box"
    assert meta["sn"] == "SN-A"
    assert meta["config_ref"] == "D:/lab/deviceA/sensor.json"
    assert meta["source_record"].endswith(source.name)

    # Saving the record again still says A.
    import orisys_studio.calibration_service as cal_service_module

    with _patch.object(cal_panel_module, "calibration_export_dir", lambda: Path(record_root)):
        with _patch.object(
            cal_service_module, "calibration_export_dir", lambda: Path(record_root)
        ):
            with _patch.object(cal_panel_module.QMessageBox, "information", lambda *a, **k: None):
                panel._on_save_record()
    saved = sorted(Path(record_root).glob("calibration_session_box_*.json"))
    assert saved, "the record was not saved under device A's type"
    saved_meta = json.loads(saved[-1].read_text(encoding="utf-8"))["meta"]
    assert saved_meta["sn"] == "SN-A"
    assert saved_meta["sensor_type"] == "box"
    assert saved_meta["config_ref"] == "D:/lab/deviceA/sensor.json"

    # ...and so does the exported coefficient document.
    document, _warnings = build_force_calibration_v2(panel._prepared)
    assert document["meta"]["sensor_type"] == "box"
    assert document["meta"]["sn"] == "SN-A"
    assert document["meta"]["config_ref"] == "D:/lab/deviceA/sensor.json"


def test_a_reopened_point_can_be_inspected_from_its_samples(make_window, record_root):
    """A record with samples but no cached trace still opens its diagnostics."""
    window = _show(make_window(), (1400, 880))
    panel = window.cal_panel
    points = [
        _add_calibration_point(window, load=1.0, raw=100.0),
        _add_calibration_point(window, load=2.0, raw=200.0),
    ]
    import json

    from orisys_app_shared.force.calibration_session import build_session_document

    document = build_session_document(points, meta={"sensor_type": "box"})
    for entry in document["points"]:
        entry["trace"] = {}  # only the audit series survived
        entry["trace_dt_s"] = 0.0
    source = Path(record_root) / "no_trace.json"
    source.write_text(json.dumps(document), encoding="utf-8")

    panel._on_open_record(str(source))
    reopened = window.cal_recorder.points[0]
    assert reopened.samples, "the reopened point lost its samples"
    dialog = panel.point_dialog(reopened)
    assert dialog is not None, "the reopened point could not be inspected"
    assert len(dialog.plot_widget.ci.items) == 3
    dialog.close()


def test_applying_another_devices_calibration_is_flagged(make_window, record_root):
    """The apply path states a sensor/config mismatch instead of silently applying."""
    import json

    from orisys_app_shared.force.calibration_io import (
        CalSample,
        CalSessionStore,
        build_export_model,
    )

    window, stuck = _running_window(make_window)
    store = CalSessionStore()
    store.aggregate("fn", CalSample(weight_n=0.0, raw_mean=0.0, n=10))
    store.aggregate("fn", CalSample(weight_n=5.0, raw_mean=500.0, n=10))
    model = build_export_model({key: store.channel(key) for key in ("fn", "fx", "fy")})
    document = model.to_dict()
    document["identity"] = {"sensor_type": "box", "sn": "SN-A"}
    document["pipeline"] = {"config_ref": "D:/lab/deviceA/sensor.json"}
    path = Path(record_root) / "deviceA_calibration.json"
    path.write_text(json.dumps(document), encoding="utf-8")

    # The window is connected to a finger device.
    mismatch = window.calibration_target_mismatch(
        str(path), sensor_type="finger", config_ref="D:/lab/deviceB/sensor.json"
    )
    assert any("sensor_type" in reason for reason in mismatch), mismatch
    assert any("config_ref" in reason for reason in mismatch), mismatch
    assert not window.calibration_target_mismatch(
        str(path), sensor_type="box", config_ref="D:/lab/deviceA/sensor.json"
    )
    _finish(window, stuck)


def test_force_plots_render_demo_data(make_window):
    window = _show(make_window(), (1440, 880))
    for i in range(60):
        window.force_plots.push(i / 30.0, float(i), -1.0, 1.0, unit="N")
    from PySide6.QtWidgets import QApplication

    QApplication.processEvents()
    assert window.force_plots.history.sample_count > 0
    assert all(label.text() for label in window.force_plots.value_labels)


# --------------------------------------------------------------- record channel
def test_record_channel_does_not_depend_on_the_ui_timer(make_window):
    window, stuck = _running_window(make_window)
    for index in range(90):
        stuck.emit(ui_check._fake_packet(index))

    assert window.session_store.count == 90, "samples were lost without a UI tick"
    _finish(window, stuck)


def test_invalid_samples_are_excluded_not_zeroed(make_window):
    import math

    window, stuck = _running_window(make_window)
    for index in range(9):
        stuck.emit(ui_check._fake_packet(index))
    stuck.emit(ui_check._fake_packet(99, valid=False, reason="read failed"))

    slice_ = window.session_store.data()
    assert slice_.valid.tolist()[-1] is False
    assert math.isnan(slice_.raw[-1][0]), "a failed readout became a number"
    assert sum(1 for _ in window.session_store.iter_valid("raw")) == 9
    _finish(window, stuck)


def test_calibration_sampling_survives_a_hidden_panel(make_window):
    window, stuck = _running_window(make_window)
    window._show_cal = False
    window._apply_panel_visibility()
    assert not window.cal_panel.isVisible()

    window.cal_recorder.start(channel="fn", reference_load_n=2.0, duration_s=1.0)
    for index in range(40):
        stuck.emit(ui_check._fake_packet(index))
    point = window.cal_recorder.finish_now()

    assert point is not None
    assert point.n_valid == 40, "hiding the panel stopped the sampling"
    assert point.status == "ok"
    _finish(window, stuck)


def test_record_button_stays_a_cancel_affordance(make_window):
    from orisys_app_shared.i18n import t

    window, stuck = _running_window(make_window)
    window.cal_panel.set_running(True)
    window.cal_panel._on_record_clicked()

    assert window.cal_panel._recording
    assert window.cal_panel.btn_record.isEnabled(), "the recording cannot be stopped"
    assert window.cal_panel.btn_record.text() == t("cal.recording_stop")

    window.cal_panel._on_record_clicked()
    assert not window.cal_panel._recording
    _finish(window, stuck)


def test_unit_switch_rebuilds_from_the_session_store(make_window):
    import math

    window, stuck = _running_window(make_window)
    window.toolbar.units_combo.setCurrentIndex(1)  # raw
    window.force_plots.reset()
    for index in range(60):
        stuck.emit(ui_check._fake_packet(index))
        window._on_run_tick()

    state = window.force_plots.history.state()
    assert float(state.values[:, 0].max()) > 5.0, "raw values were not plotted"

    window.toolbar.units_combo.setCurrentIndex(0)  # newton
    assert window.force_plots._unit == "N"
    newtons = window.force_plots.history.state().values[:, 0]
    finite = [v for v in newtons if math.isfinite(v)]
    assert finite and max(finite) < 5.0, "the buffer still held raw values in N mode"
    _finish(window, stuck)


def test_history_keeps_negative_fn(make_window):
    window, stuck = _running_window(make_window)
    window.force_plots.set_fixed_newton(True)
    for index in range(20):
        window.force_plots.push(index / 30.0, -2.5, 0.0, 0.0, unit="N")
    window.force_plots.push(1.0, -3.0, 0.0, 0.0, unit="N")

    state = window.force_plots.history.state()
    assert float(state.values[:, 0].min()) < 0.0, (
        "negative FN was clamped before entering the buffer"
    )
    _finish(window, stuck)


def test_the_live_axis_is_session_relative_and_survives_a_unit_switch(make_window):
    """The live buffer, the store and a rebuilt history share one time base.

    Feeding the wall clock into the plot put the live axis ~1.7e9 s away from the
    session store's, so a unit switch (which rebuilds from the store) jumped the
    X axis and the chart looked like it had lost its history.
    """
    wall = 1_700_000_000.0
    window, stuck = _running_window(make_window)
    window.toolbar.units_combo.setCurrentIndex(0)  # newton
    window.force_plots.reset()
    for index in range(90):
        stuck.emit(
            ui_check._fake_packet(
                index, timestamp=wall + index / 30.0, mono_t=index / 30.0
            )
        )
        window._on_run_tick()

    before = window.force_plots.history.state()
    assert before is not None
    end_before = float(before.times[-1])
    assert end_before < 60.0, (
        f"the live X axis is not session-relative: it ends at {end_before}"
    )
    assert abs(end_before - 89 / 30.0) < 0.5, end_before

    for units_index in (1, 0, 1, 0):  # raw -> N -> raw -> N
        window.toolbar.units_combo.setCurrentIndex(units_index)

    after = window.force_plots.history.state()
    assert after is not None, "the unit switch emptied the rebuilt history"
    assert abs(float(after.times[-1]) - end_before) < 1.0, (
        f"the X axis jumped across a unit switch: {end_before} -> {after.times[-1]}"
    )
    _finish(window, stuck)


def test_a_single_calibrated_axis_is_shown_and_the_others_are_unavailable(make_window):
    """Only FN calibrated: FN in newtons, FX/FY explicitly unavailable."""
    import math

    from orisys_app_shared.i18n import t

    window, stuck = _running_window(make_window)
    window.toolbar.units_combo.setCurrentIndex(0)  # newton
    window.force_plots.reset()
    for index in range(10):
        stuck.emit(
            ui_check._fake_packet(
                index,
                calibrated_axes=("fn",),
                shear_n=float("nan"),
            )
        )
        window._on_run_tick()

    plots = window.force_plots
    assert plots._available == (True, False, False), plots._available
    assert plots.value_labels[0].text() != t("chart.value_unavailable")
    for index in (1, 2):
        assert plots.value_labels[index].text() == t("chart.value_unavailable"), (
            "an axis with no curve must not show a number"
        )
    state = plots.history.state()
    assert math.isfinite(float(state.values[:, 0].max()))
    assert not any(math.isfinite(v) for v in state.values[:, 1]), (
        "FX carried a value in newton mode without a curve"
    )
    _finish(window, stuck)


def test_a_slow_close_is_not_reported_as_a_finished_recording(make_window):
    """Stopping must not present an unclosed file as a finished experiment."""
    import threading as _threading
    from unittest.mock import patch as _patch

    from orisys_app_shared.i18n import t
    from orisys_app_shared.record.experiment import _SessionWriter

    window, stuck = _running_window(make_window)
    window.toolbar.btn_record.setChecked(True)
    stuck.emit(ui_check._fake_packet(0))
    window._on_run_tick()

    started = _threading.Event()
    release = _threading.Event()
    original = _SessionWriter.write_sample

    def slow(self, *args):
        started.set()
        release.wait(10.0)
        return original(self, *args)

    with _patch.object(_SessionWriter, "write_sample", slow):
        stuck.emit(ui_check._fake_packet(1))
        window._on_run_tick()
        assert started.wait(5.0), "the writer never picked up the frame"

        window._stop_recording(wait=False)
        assert window.recorder.report is None, "the stop claimed a finished recording"
        assert window._record_report_pending, "the pending report was not tracked"
        assert window._record_last_report is None
        assert not window.toolbar.btn_record.isChecked(), (
            "the record button still looks active while the file closes"
        )
        assert window.statusBar().currentMessage() == t("record.closing")

        release.set()
        deadline = __import__("time").monotonic() + 10.0
        while window.recorder.report is None and __import__("time").monotonic() < deadline:
            __import__("time").sleep(0.01)
        window._on_run_tick()

    report = window._record_last_report
    assert report is not None and report.completed, "the terminal report was never published"
    assert not window._record_report_pending
    _finish(window, stuck)


def test_a_failed_recording_is_consumed_even_when_it_is_not_running(make_window):
    """A recording that died on its own still has a report to publish."""
    import time as _time
    from unittest.mock import patch as _patch

    from orisys_app_shared.record.experiment import _SessionWriter

    window, stuck = _running_window(make_window)
    window.toolbar.btn_record.setChecked(True)
    assert window.recorder.is_recording

    with _patch.object(_SessionWriter, "write_sample", side_effect=OSError("disk full")):
        for index in range(8):
            stuck.emit(ui_check._fake_packet(index))
            window._on_run_tick()
        deadline = _time.monotonic() + 3.0
        while window.recorder.stats().write_errors < 5 and _time.monotonic() < deadline:
            _time.sleep(0.01)
        assert window.recorder.stats().failed
        assert not window.recorder.is_recording

        # ``is_recording`` is already False: the stop must still consume the report.
        window._stop_recording()
        report = window._record_last_report
        assert report is not None and report.stats.failed
        assert not window.toolbar.btn_record.isChecked()
        assert window._session_phase == "error"
    _finish(window, stuck)



def test_a_confirmed_calibration_is_snapshotted_into_the_recording(make_window, record_root):
    """The recording keeps the coefficients themselves, not only their hash."""
    import json
    from pathlib import Path

    import orisys_studio.app_window as app_module

    window, stuck = _running_window(make_window)
    app_module.recordings_dir = lambda: record_root
    window.toolbar.btn_record.setChecked(True)
    assert window.recorder.is_recording

    coefficients = Path(record_root) / "force_calibration_box.json"
    coefficients.write_text('{"unit": "N", "channels": {}}', encoding="utf-8")
    version = "deadbeefcafe1234"
    window._on_calibration_applied(
        str(coefficients), version, 21, 0.7, int(window.session_store.session_id)
    )
    window._drain_calibration_events()

    directory = window.recorder.directory
    assert directory is not None
    snapshots = sorted(path.name for path in (directory / "calibration").iterdir())
    assert snapshots == [f"force_calibration_{version[:12]}.json"], snapshots
    assert (directory / "calibration" / snapshots[0]).read_text(
        encoding="utf-8"
    ) == '{"unit": "N", "channels": {}}'
    assert window._active_calibration_id == version
    assert window.session_store.calibration_id == version

    window._stop_recording()
    meta = json.loads((directory / "session.json").read_text(encoding="utf-8"))
    entries = meta["calibration_snapshots"]
    assert entries and entries[0]["version"] == version
    assert entries[0]["file"] == f"calibration/{snapshots[0]}"
    assert entries[0]["frame_id"] == 21
    event = next(e for e in meta["events"] if e["kind"] == "calibration_applied")
    assert event["frame_id"] == 21 and event["mono_t"] == pytest.approx(0.7)
    assert snapshots[0] in event["detail"]
    _finish(window, stuck)


def test_a_confirmed_absence_of_calibration_does_not_keep_the_old_version(make_window):
    """An empty version is the honest answer; it must not fall back to the path."""
    from orisys_app_shared.i18n import t

    window = _show(make_window(), (1400, 880))
    window._active_calibration_id = "previous-hash"
    window._on_calibration_applied("/tmp/whatever.json", "", 5, 0.2, 1)
    window._drain_calibration_events()
    assert window._active_calibration_id == "", (
        "an uncalibrated device kept claiming the previous coefficients"
    )
    assert window.statusBar().currentMessage() == t("cal.applied_none")


def test_a_zeroing_is_recorded_only_after_the_worker_confirms_it(make_window, record_root):
    import json

    import orisys_studio.app_window as app_module

    window, stuck = _running_window(make_window)
    app_module.recordings_dir = lambda: record_root
    window.toolbar.btn_record.setChecked(True)
    stuck.emit(ui_check._fake_packet(3))
    window._on_run_tick()

    window._on_reset()
    assert stuck.reset_requests == 1, "the zeroing was not requested"
    # The stub confirms from the acquisition side, as a real device does.
    stuck.on_reset_applied = window._on_reset_applied
    window._on_reset()
    window._on_run_tick()
    window._stop_recording()

    directory = window.recorder.directory
    meta = json.loads((directory / "session.json").read_text(encoding="utf-8"))
    zeroing = [e for e in meta["events"] if e["kind"] == "zeroing"]
    assert len(zeroing) == 1, f"unexpected zeroing events: {zeroing}"
    assert zeroing[0]["frame_id"] == 3, zeroing[0]
    assert zeroing[0]["mono_t"] is not None
    _finish(window, stuck)


def test_depth_view_reports_missing_data_and_fixes_its_scale(make_window):
    import numpy as np

    window, stuck = _running_window(make_window)
    window.arrow_panel.set_view_mode("depth")

    window._last_rendered_view_mode = None
    stuck.emit(ui_check._fake_packet(0, depth=None))
    window._on_run_tick()
    from orisys_app_shared.i18n import t

    assert window.arrow_panel.image_label.text() == t("panels.depth_unavailable"), (
        "a missing depth map silently fell back to the processed frame"
    )

    window._last_rendered_view_mode = None
    stuck.emit(ui_check._fake_packet(1, depth=np.linspace(0.0, 1.0, 64).reshape(8, 8)))
    window._on_run_tick()
    latched = window.arrow_panel.depth_scale_label.text()
    assert latched

    window._last_rendered_view_mode = None
    stuck.emit(ui_check._fake_packet(2, depth=np.linspace(0.0, 9.0, 64).reshape(8, 8)))
    window._on_run_tick()
    assert window.arrow_panel.depth_scale_label.text() == latched, (
        "the depth colour scale re-fitted on every frame"
    )
    _finish(window, stuck)


def test_the_domain_boundary_is_latched_for_the_session(make_window):
    """The 2D boundary is the device's island: rebuilt per frame, decided once.

    Same treatment as the depth colour scale above, and for the same reason — a mask
    that is re-derived every frame redraws an edge that has not moved, and any pixel of
    difference repaints the whole boundary (measured: a 0.73% area wobble repaints 69%
    of the boundary band).
    """
    import numpy as np

    window, stuck = _running_window(make_window)
    window.arrow_panel.set_view_mode("arrows_pure")
    island = np.zeros((8, 8), dtype=bool)
    island[1:7, 1:7] = True
    island_wobble = island.copy()
    island_wobble[1, 1] = False  # one pixel of rim, i.e. 1.6% of a 36-pixel island

    window._last_rendered_view_mode = None
    stuck.emit(ui_check._fake_packet(0, valid_mask=island))
    window._on_run_tick()
    assert np.array_equal(window._domain_mask.mask, island), (
        "the session never established the device's island"
    )

    window._last_rendered_view_mode = None
    stuck.emit(ui_check._fake_packet(1, valid_mask=island_wobble))
    window._on_run_tick()
    assert np.array_equal(window._domain_mask.mask, island), (
        "a rebuilt mask moved the session's boundary"
    )
    assert (window._domain_mask.adoptions, window._domain_mask.held) == (1, 1)

    # An island that really changed is adopted rather than frozen out.
    moved = np.zeros((8, 8), dtype=bool)
    moved[2:8, 2:8] = True
    window._last_rendered_view_mode = None
    stuck.emit(ui_check._fake_packet(2, valid_mask=moved))
    window._on_run_tick()
    assert np.array_equal(window._domain_mask.mask, moved), (
        "a moved island kept the old boundary on screen"
    )
    assert window._domain_mask.adoptions == 2

    # A new run is a new session: the previous island must not survive into it.
    _finish(window, stuck)
    window._start_run()
    assert window._domain_mask.mask is None, (
        "the previous session's island survived into a new run"
    )
    window._run_timer.stop()
    window._stop_run(reason="user_stop")


# ------------------------------------------------------------- experiment record
def test_recording_writes_the_documented_experiment_layout(make_window, record_root):
    import csv
    import json

    import orisys_studio.app_window as app_module
    from orisys_app_shared.i18n import t

    window, stuck = _running_window(make_window)
    app_module.recordings_dir = lambda: record_root
    assert window.toolbar.btn_record.isEnabled()
    assert window.toolbar.btn_record.text() == t("record.start_label")

    window.toolbar.btn_record.setChecked(True)
    assert window.recorder.is_recording, "the recording did not start"
    assert window.toolbar.btn_record.text() == t("record.stop_label")
    assert not window.toolbar.record_mode_combo.isEnabled()

    for index in range(20):
        stuck.emit(ui_check._fake_packet(index))
        window._on_run_tick()
    window.toolbar.btn_record.setChecked(False)

    report = window._record_last_report
    assert report is not None and report.ok, getattr(report, "problems", None)
    names = sorted(path.name for path in report.directory.iterdir())
    assert names == ["events.csv", "forces.csv", "frames.csv", "raw_0001.mp4", "session.json"]

    with (report.directory / "forces.csv").open(encoding="utf-8") as handle:
        forces = list(csv.DictReader(handle))
    with (report.directory / "frames.csv").open(encoding="utf-8") as handle:
        frames = list(csv.DictReader(handle))
    assert len(forces) == len(frames) == 20
    assert [f["frame_id"] for f in frames] == [r["frame_id"] for r in forces]
    assert [f["t_rel_s"] for f in frames] == [r["t_rel_s"] for r in forces]

    meta = json.loads((report.directory / "session.json").read_text(encoding="utf-8"))
    assert meta["ended_at"]
    assert meta["format_version"]
    assert meta["stats"]["frames"] == 20
    _finish(window, stuck)


def test_recording_leaves_unavailable_values_empty(make_window, record_root):
    import csv

    import orisys_studio.app_window as app_module

    window, stuck = _running_window(make_window)
    app_module.recordings_dir = lambda: record_root
    window.toolbar.btn_record.setChecked(True)
    stuck.emit(ui_check._fake_packet(0))
    window._on_run_tick()
    stuck.emit(ui_check._fake_packet(1, valid=False, reason="read failed"))
    window._on_run_tick()
    window.toolbar.btn_record.setChecked(False)

    with (window._record_last_report.directory / "forces.csv").open(encoding="utf-8") as handle:
        rows = list(csv.DictReader(handle))
    failed = rows[-1]
    assert failed["valid"] == "0"
    assert failed["FN_raw"] == "" and failed["FN_N"] == "", (
        "a failed readout was persisted as a number"
    )
    _finish(window, stuck)


# ------------------------------------------------------- top rail / settings


def test_top_area_stays_compact(make_window):
    """The rail is read at a glance; it is not a place to stack configuration."""
    from orisys_app_shared.i18n import t

    window = _show(make_window(), (1440, 880))
    collapsed = window.brand_bar.height() + window.toolbar.height()
    assert collapsed <= 78, f"the collapsed top area is {collapsed}px tall"
    assert window.brand_bar.height() <= 30
    assert not window.toolbar.settings_expanded()
    assert window.brand_bar.btn_live.text() and window.brand_bar.btn_playback.text()
    assert window.toolbar.status_chip.text().strip()
    assert window.toolbar.record_chip.text() == t("record.state_idle")

    window.toolbar.btn_settings.setChecked(True)
    from PySide6.QtWidgets import QApplication

    QApplication.processEvents()
    assert window.toolbar.settings_expanded()
    assert window.toolbar.units_combo.isVisible()
    assert window.toolbar.btn_preview.isVisible()
    expanded = window.brand_bar.height() + window.toolbar.height()
    assert expanded > collapsed, "opening the settings area changed nothing"
    assert window.act_settings.isChecked(), "the View menu does not follow the toggle"
    assert window.prefs["settings_expanded"] is True

    window.toolbar.btn_settings.setChecked(False)
    QApplication.processEvents()
    assert not window.toolbar.settings_expanded()


@pytest.mark.parametrize("size", RESOLUTIONS)
def test_settings_area_stays_inside_its_container(make_window, size):
    """Opening the settings area must not push a widget past its parent.

    The settings area is the one part of the top rail that may scroll: its own
    content is exempt, everything else must fit.
    """
    from PySide6.QtWidgets import QApplication

    window = _show(make_window(sensor_type="finger", show_cal_panel=True), size)
    window._set_settings_expanded(True)
    for _ in range(3):
        QApplication.processEvents()

    oversize = []
    for child in visible_descendants(window):
        if ui_check._inside_scroll_area(child):
            continue
        parent = child.parentWidget()
        if parent is None or not parent.isVisible():
            continue
        geometry = child.geometry()
        if geometry.width() > parent.width() + 1 or geometry.height() > parent.height() + 1:
            oversize.append(
                f"{type(child).__name__} {geometry.width()}x{geometry.height()}"
                f" > parent {parent.width()}x{parent.height()}"
            )
    assert not oversize, oversize


def test_idle_run_is_the_only_filled_action(make_window):
    window = _show(make_window(), (1440, 880))
    assert window.toolbar.btn_run.objectName() == "primaryButton"
    assert not window.toolbar.btn_record.isEnabled(), "recording without a session"


def test_connecting_cancel_stays_filled(make_window):
    """Cancel is the way out of a hung device open, so it keeps the weight.

    It lives on the rail's Stop button now (the transport is a play/pause toggle in
    both views, so it can no longer be the stop), which is why the filled danger is
    checked there.
    """
    from PySide6.QtWidgets import QApplication

    window = _show(make_window(), (1440, 880))
    stuck = ui_check._StuckWorker()
    window._ensure_workers = lambda: None
    window._box_worker = stuck
    window._finger_worker = stuck
    window.toolbar.btn_run.setChecked(True)
    QApplication.processEvents()
    assert window._session_phase == "connecting"
    assert window.toolbar.btn_stop.objectName() == "dangerButton"
    window.toolbar.btn_stop.click()
    stuck.release()


def test_exactly_one_filled_action_while_acquiring(make_window):
    """Driven through the real entry point: Run, then the first packet."""
    window = _show(make_window(), (1440, 880))
    stuck = ui_check._StuckWorker()
    window._ensure_workers = lambda: None
    window._box_worker = stuck
    window._finger_worker = stuck
    window.toolbar.btn_run.setChecked(True)
    window._run_timer.stop()
    assert window._session_phase == "connecting"
    assert window.toolbar.btn_stop.objectName() == "dangerButton", (
        "Cancel lost its weight while a connect can hang"
    )

    stuck.emit(ui_check._fake_packet(1))
    window._on_run_tick()
    assert window._session_phase == "running"
    assert window.toolbar.btn_stop.objectName() == "dangerOutline", (
        "Stop is still the filled action while a session merely acquires"
    )
    assert window.toolbar.btn_record.objectName() == "primaryButton"
    assert window.toolbar.btn_run.objectName() == "ghostButton", (
        "the transport competes with the filled record action"
    )

    window.toolbar.set_record_checked(True)
    assert window.toolbar.btn_record.objectName() == "dangerButton"
    assert window.toolbar.btn_stop.objectName() == "dangerOutline", (
        "two filled actions share the rail while recording"
    )

    window.toolbar.set_record_checked(False)
    window.toolbar.btn_stop.click()
    stuck.release()


def test_the_live_rail_is_a_play_pause_toggle_with_its_own_stop(make_window):
    """Slot 1 means the same thing in both views: play/pause, and Stop beside it.

    The live view used to fill that slot with a stop toggle and keep a second,
    icon-only pause button next to it, so the same position meant two different
    things depending on which view was on screen.
    """
    from orisys_app_shared.i18n import t
    from PySide6.QtWidgets import QApplication

    window = _show(make_window(), (1440, 880))
    stuck = ui_check._StuckWorker()
    window._ensure_workers = lambda: None
    window._box_worker = stuck
    window._finger_worker = stuck

    # Idle: the transport starts the session, and Stop has nothing to end.
    assert window.toolbar.btn_run.text() == t("toolbar.run_label")
    assert not window.toolbar.btn_stop.isEnabled()

    # Connecting: still a pause toggle, and Stop is the way out of a hung open.
    window.toolbar.btn_run.setChecked(True)
    window._run_timer.stop()
    QApplication.processEvents()
    assert window._session_phase == "connecting"
    assert window.toolbar.btn_run.text() == t("toolbar.pause")
    assert window.toolbar.btn_stop.text() == t("toolbar.cancel_label")
    assert window.toolbar.btn_stop.isEnabled()

    stuck.emit(ui_check._fake_packet(1))
    window._on_run_tick()
    QApplication.processEvents()
    assert window._session_phase == "running"
    assert window.toolbar.btn_run.text() == t("toolbar.pause")

    # Unchecked *with* a session is paused, not stopped.
    window.toolbar.btn_run.setChecked(False)
    QApplication.processEvents()
    assert window._session_phase == "running", "the transport stopped instead of pausing"
    assert window.toolbar.btn_run.text() == t("toolbar.resume_label")
    assert stuck.is_paused is True, "the worker was not asked to pause"
    assert window.toolbar.btn_stop.isEnabled(), "the way out vanished while paused"

    window.toolbar.btn_run.setChecked(True)
    QApplication.processEvents()
    assert stuck.is_paused is False, "the worker was not asked to resume"

    # Stop ends it; the transport goes back to idle.
    window.toolbar.btn_stop.click()
    QApplication.processEvents()
    assert window._session_phase == "idle"
    assert not window.toolbar.btn_run.isChecked()
    assert window.toolbar.btn_run.text() == t("toolbar.run_label")
    stuck.release()


def test_record_strip_separates_acquiring_from_recording(make_window):
    from orisys_app_shared.i18n import t
    from orisys_app_shared.record.experiment import RecordStats
    from orisys_studio.ui import record_status

    window, stuck = _running_window(make_window)
    chip = window.toolbar.record_chip
    assert chip.text() == t("record.state_idle")
    assert t("record.state_idle") != t("status.phase_running"), (
        "acquiring and recording share one label"
    )

    real_stats = window._record_stats
    window._record_stats = lambda: (
        record_status.RECORDING,
        RecordStats(duration_s=12.4, frames=372, segments=1, dropped_data=3),
        "20240101T000000Z_session0001_deadbeef",
    )
    window._refresh_record_state()
    assert t("record.state_recording", duration="00:12.4") in chip.text()
    assert t("record.dropped", count=3) in chip.text()
    assert "deadbeef" in chip.toolTip()
    # A missing placeholder would leave the raw template in place: ``t`` falls
    # back to the key instead of raising, so the tooltip is asserted on content.
    assert chip.toolTip() != t("record.strip_tip")

    window._record_stats = lambda: (
        record_status.ERROR,
        RecordStats(frames=10, segments=1, failed=True, write_errors=2, last_error="disk full"),
        "",
    )
    window._refresh_record_state()
    assert chip.text() == t("record.state_error", count=2)
    assert "disk full" in chip.toolTip()

    window._record_stats = real_stats
    _finish(window, stuck)


# --------------------------------------------------- curves / arrow legend


def test_axis_readouts_sit_above_the_charts(make_window):
    window = _show(make_window(), (1440, 880))
    panel = window.force_plots
    assert panel.value_group.y() < panel.plot_frame.y(), (
        "the axis readouts are not above the charts"
    )
    for label in panel.value_labels:
        assert label.text(), "an axis readout is empty"
        assert label.height() >= label.fontMetrics().height(), "a readout is clipped"
        assert label.fontMetrics().height() >= 20, "the readouts are not large digits"
    assert [
        plot.getAxis("bottom").style.get("showValues") for plot in panel.plots
    ] == [False, False, True], "the three charts do not share one bottom time axis"


def test_overview_region_is_the_timeline_control(make_window):
    window, stuck = _running_window(make_window)
    panel = window.force_plots
    for index in range(120):
        stuck.emit(ui_check._fake_packet(index + 100))
    window._on_run_tick()
    assert window.session_store.count == 120
    first, last = window.session_store.extent()
    assert last > first, "the session has no extent to browse"
    assert panel.window_label.text(), "the overview strip has no readout"

    panel.show_all()
    assert panel.mode() == "browse"
    target = (first + (last - first) * 0.25, first + (last - first) * 0.5)
    panel.overview_region.setRegion(target)
    dragged = panel.window()
    assert abs(dragged[0] - target[0]) < 0.05 and abs(dragged[1] - target[1]) < 0.05, (
        f"dragging the overview did not move the window: {dragged} vs {target}"
    )
    assert panel.mode() == "browse"

    window.brand_bar.btn_live.click()
    assert panel.mode() == "follow", "the live nav item did not leave history browsing"
    _finish(window, stuck)


def test_the_charts_start_in_follow_mode(make_window):
    """Every live entry point resumes following; only browsing is a gesture."""
    from orisys_app_shared.i18n import t
    from PySide6.QtWidgets import QApplication

    window, stuck = _running_window(make_window)
    panel = window.force_plots
    assert panel.mode() == "follow"
    assert panel.mode_label.text() == t("chart.mode_follow")

    for index in range(40):
        stuck.emit(ui_check._fake_packet(index))
        window._on_run_tick()
    QApplication.processEvents()
    assert panel.mode() == "follow", "live samples pushed the charts into browsing"

    panel._unit = "raw"
    window._on_units_changed("newton")
    assert panel.mode() == "follow", "a unit switch left the charts browsing"
    window._on_units_changed("raw")
    assert panel.mode() == "follow"

    # A new session is a live session again.
    panel.show_all()
    assert panel.mode() == "browse"
    window._start_run()
    window._run_timer.stop()
    assert panel.mode() == "follow", "a new run did not resume following"
    _finish(window, stuck)


def test_the_charts_zoom_and_pan_in_every_view(make_window):
    """Zoom/pan must be reachable from the live view, not only while browsing."""
    from PySide6.QtWidgets import QApplication

    window, stuck = _running_window(make_window)
    panel = window.force_plots
    for index in range(60):
        stuck.emit(ui_check._fake_packet(index))
        window._on_run_tick()
    QApplication.processEvents()

    view_box = panel.plots[0].getViewBox()
    assert panel.mode() == "follow"
    assert view_box.state["mouseEnabled"][0], "the live chart ignores the mouse"

    # The gesture signal is what pyqtgraph emits for a wheel or drag.
    view_box.setXRange(0.5, 1.5, padding=0.0)
    view_box.sigRangeChangedManually.emit([True, False])
    QApplication.processEvents()
    assert panel.mode() == "browse", "a wheel/drag gesture did not start browsing"
    assert panel.window() == (0.5, 1.5), f"the gesture was not applied: {panel.window()}"
    assert all(cursor.movable for cursor in panel.cursors)

    # A programmatic change is not a gesture and must not switch the view.
    panel.follow_latest()
    view_box.setXRange(1.0, 1.5, padding=0.0)
    QApplication.processEvents()
    assert panel.mode() == "follow", "a programmatic range change started browsing"

    # While browsing, dragging the shared cursor moves the playhead.
    panel.show_all()
    moved: list[float] = []
    panel.cursor_moved.connect(moved.append)
    panel.cursors[0].setValue(1.25)
    QApplication.processEvents()
    assert [round(cursor.value(), 2) for cursor in panel.cursors] == [1.25] * 3
    assert moved and moved[-1] == 1.25, "the cursor drag did not notify the replay"
    _finish(window, stuck)


def test_the_arrow_legend_follows_the_view_mode(make_window):
    from orisys_app_shared.acquisition.arrows import arrow_display_scale

    assert arrow_display_scale("box") == 2.0
    assert arrow_display_scale("finger") == 1.0

    window = _show(make_window(), (1440, 880))
    panel = window.arrow_panel
    # The pipeline labels are diagnostics: off by default (the canvas keeps what the
    # picture *is*), on when the operator asks — 视图 ▸ 诊断信息.
    assert not panel.scale_label.isVisible()
    assert not panel.pipeline_label.isVisible()
    assert not panel.area_label.isVisible()
    panel.set_diagnostics_visible(True)
    assert panel.scale_label.isVisible()
    assert "2" in panel.scale_label.text()
    assert panel.pipeline_label.isVisible() and panel.pipeline_label.text()
    assert panel.area_label.isVisible() and panel.area_label.text()
    assert not panel.colorbar.isVisible(), "the depth colour bar is shown in arrows"

    panel.set_view_mode("depth")
    panel.set_depth_scale("0.000 – 1.000")
    assert panel.colorbar.isVisible(), "the depth view has no colour bar"
    assert panel.depth_scale_label.isVisible()
    assert not panel.scale_label.isVisible(), "the arrow magnification leaked into depth"

    panel.set_view_mode("arrows_pure")
    assert not panel.colorbar.isVisible()
    assert panel.scale_label.isVisible()

    panel.set_diagnostics_visible(False)
    assert not panel.scale_label.isVisible(), "诊断信息 off still shows the pipeline"


# ------------------------------------------------- top rail: sensor and views


def test_the_sensor_summary_opens_the_dialog(make_window):
    """The rail states the sensor; the pickers live in the dialog it opens."""
    from orisys_app_shared.i18n import t
    from PySide6.QtWidgets import QApplication

    window = _show(make_window(), (1440, 880))
    assert window.toolbar.btn_sensor.text() == t(
        "sensor.summary", type="BOX", config="sensor.json"
    )
    assert window.toolbar.btn_sensor.toolTip() == t("sensor.dialog_tip")
    assert not window.sensor_picker.isVisible(), "the pickers are still on the rail"

    window.toolbar.btn_sensor.click()
    QApplication.processEvents()
    dialog = window.sensor_dialog
    assert dialog is not None and dialog.isVisible()
    picker = window.sensor_picker
    assert picker.isVisible(), "the sensor pickers are not in the dialog"
    assert picker.type_label.text() == t("sensor.type")
    assert picker.config_label.text() == t("sensor.config")
    assert dialog.calib_title.text() == t("sensor.calib_section")
    assert dialog.version_label.text() and dialog.axes_label.text()
    assert dialog.export_label.text() == t("sensor.export_none")
    assert not dialog.btn_apply.isEnabled(), "applying with no export"

    # Changing the product in the dialog reaches the window and the rail.
    picker.type_combo.setCurrentIndex(picker.type_combo.findData("finger"))
    QApplication.processEvents()
    assert window.prefs["sensor_type"] == "finger"
    assert "FINGER" in window.toolbar.btn_sensor.text()
    assert picker.sensor_type() == "finger" and picker.config_name()

    picker.type_combo.setCurrentIndex(picker.type_combo.findData("box"))
    QApplication.processEvents()
    dialog.close()


def test_the_source_picker_follows_the_view(make_window):
    """Live offers a camera, the replay a recorded video — and no residue."""
    from PySide6.QtWidgets import QApplication

    window, stuck = _running_window(make_window)
    assert window.toolbar.camera_group.isVisible()
    assert not window.toolbar.video_group.isVisible()
    assert not window.toolbar.btn_replay_video.isVisible()
    assert not hasattr(window.toolbar, "source_combo"), "the source is still a combobox"

    window.brand_bar.btn_playback.click()
    QApplication.processEvents()
    assert not window.toolbar.camera_group.isVisible(), "the replay view shows a camera picker"
    assert window.toolbar.btn_replay_video.isVisible()
    window.brand_bar.btn_live.click()
    QApplication.processEvents()
    assert window.toolbar.camera_group.isVisible()

    # A recorded video belongs to the replay view: the live view is a camera, and
    # it must not keep naming a file after the view has changed.
    window.toolbar.set_video_path("C:/tmp/demo.mp4")
    window._set_source_mode("video")
    QApplication.processEvents()
    assert window.toolbar.video_group.isVisible()
    assert "demo.mp4" not in window.toolbar.source_summary.text(), (
        f"the live view names a replay's video: "
        f"{window.toolbar.source_summary.text()!r}"
    )
    window.brand_bar.btn_playback.click()
    QApplication.processEvents()
    assert "demo.mp4" in window.toolbar.source_summary.text(), (
        f"the replay view does not name its video: "
        f"{window.toolbar.source_summary.text()!r}"
    )
    window.brand_bar.btn_live.click()
    QApplication.processEvents()
    assert "demo.mp4" not in window.toolbar.source_summary.text(), (
        "the video name stayed on the rail after leaving the replay"
    )
    assert not window.toolbar.btn_preview.isEnabled(), "preview is offered for a video file"

    window.toolbar.use_camera_clicked.emit()
    QApplication.processEvents()
    assert window.toolbar.source_mode() == "camera"
    assert window.toolbar.video_path() == ""
    _finish(window, stuck)


def test_the_nav_items_switch_the_main_window_layout(make_window):
    window, stuck = _running_window(make_window)
    for index in range(60):
        stuck.emit(ui_check._fake_packet(index + 100))
    window._on_run_tick()
    assert window.session_store.count == 60

    window.brand_bar.btn_calibration.click()
    assert window.view_preset() == "calibration"
    sizes = window.content_splitter.sizes()
    assert window.cal_panel.isVisible()
    assert not window.arrow_panel.isVisible(), "the calibration view keeps the 2D panel"
    assert sizes[3] >= 500, f"the calibration panel is too narrow: {sizes}"
    assert window.brand_bar.btn_calibration.property("navActive") == "true"

    window.brand_bar.btn_playback.click()
    assert window.view_preset() == "replay"
    assert window.arrow_panel.isVisible() and not window.cal_panel.isVisible()
    # No recording is open yet: the charts keep following the live session
    # instead of pretending to replay something, and the layout is the live one.
    assert not window.replay.is_loaded()
    assert window.force_plots.mode() == "follow", "browsing starts with no recording"
    assert window.toolbar.btn_replay_video.isVisible(), "no video picker in the replay"
    live_sizes = tuple(window.content_splitter.sizes())

    window.brand_bar.btn_live.click()
    assert window.view_preset() == "live"
    sizes = window.content_splitter.sizes()
    assert sizes[2] > sizes[1], f"the 2D panel is not the smaller one: {sizes}"
    assert window.force_plots.mode() == "follow"
    assert window.brand_bar.btn_live.property("navActive") == "true"
    _finish(window, stuck)


def test_the_calibration_view_does_not_clip_its_controls(make_window):
    from PySide6.QtWidgets import QHeaderView

    window = _show(make_window(sensor_type="box", show_cal_panel=True), (1440, 880))
    window.brand_bar.btn_calibration.click()
    from PySide6.QtWidgets import QApplication

    for _ in range(3):
        QApplication.processEvents()

    cal = window.cal_panel
    assert cal.scroll.isVisible(), "the calibration panel cannot scroll"
    assert (
        cal.table.horizontalHeader().sectionResizeMode(0) == QHeaderView.ResizeMode.ResizeToContents
    ), "the diagnostic columns can still be elided"
    for button in (cal.btn_apply, cal.btn_export, cal.btn_toggle_validation):
        assert button.height() >= button.fontMetrics().height(), button.text()
        assert button.width() >= button.sizeHint().width(), (
            f"{button.text()!r} is clipped: {button.width()} < {button.sizeHint().width()}"
        )


def test_the_2d_area_keeps_the_output_aspect_ratio(make_window):
    window = _show(
        make_window(sensor_type="finger", show_finger_3d=False), (1440, 880)
    )
    image = window.arrow_panel.image_label
    assert abs(image.aspect() - 16.0 / 9.0) < 0.01
    assert abs(image.height() - image.width() / image.aspect()) <= 2, (
        f"the 2D area does not follow the output aspect: {image.width()}x{image.height()}"
    )


def test_the_replay_view_is_the_live_view_with_a_video_source(make_window):
    """One layout for both views; the only difference is the source slot.

    The replay used to carry its own bar (a progress slider plus a recording
    picker). It is gone: the chart's cursor is the playhead, its header carries
    the transport, and the rail shows the video instead of the camera.
    """
    from orisys_app_shared.i18n import t

    window = _show(make_window(), (1440, 880))
    window.brand_bar.btn_live.click()
    from PySide6.QtWidgets import QApplication

    QApplication.processEvents()
    live_sizes = tuple(window.content_splitter.sizes())

    window.brand_bar.btn_playback.click()
    QApplication.processEvents()
    assert not hasattr(window, "replay_bar"), "the replay still has a separate bar"
    assert tuple(window.content_splitter.sizes()) == live_sizes, (
        "the replay view is not laid out like the live view"
    )
    assert window.toolbar.btn_replay_video.isVisible(), "no video picker while replaying"
    assert window.toolbar.btn_replay_video.text() == t("toolbar.choose_video")
    assert window.toolbar.btn_replay_video.toolTip() == t("toolbar.choose_video_tip")
    assert not window.toolbar.camera_group.isVisible(), "the replay offers the camera"
    assert window.brand_bar.btn_live.property("navActive") != "true"

    window.brand_bar.btn_live.click()
    QApplication.processEvents()
    assert window.toolbar.camera_group.isVisible(), "the live view lost its camera picker"
    assert not window.toolbar.btn_replay_video.isVisible(), (
        "the live view still shows the replay's video picker"
    )
    assert not window.toolbar.btn_replay_video.isVisible()


def test_the_replay_view_loads_a_recording_and_scrubs_it(make_window, replay_recording):
    """The replay view reads the recording: charts, 2D panel and transport."""
    from orisys_app_shared.i18n import t
    from PySide6.QtWidgets import QApplication

    window = _show(make_window(), (1440, 880))
    window.brand_bar.btn_playback.click()
    QApplication.processEvents()

    assert window._load_recording(replay_recording)
    QApplication.processEvents()
    panel = window.force_plots
    assert panel.is_recording_source(), "the charts did not switch to the recording"
    assert panel.mode() == "browse", "opening a recording did not browse it"
    assert panel.mode_label.text() == t("chart.mode_replay")
    assert not panel.btn_latest.isEnabled(), "a recording offers 'back to latest'"
    drawn = [int(curve.getData()[0].size) for curve in panel.curves]
    assert all(count > 0 for count in drawn), f"the recording drew nothing: {drawn}"

    assert window.arrow_panel.view_modes() == ("recorded",)
    assert window.replay.video_image() is not None, "no frame at the cursor"
    assert window.toolbar.run_role() == "playback", "the rail lost the transport"
    assert window.toolbar.btn_run.isEnabled(), "the replay has no transport"
    assert not window.toolbar.btn_run.isChecked(), "the replay starts out playing"
    assert window.toolbar.btn_run.text() == t("toolbar.playback")

    # The cursor is the playhead: setting it moves the video.
    window.replay.set_position(window.replay.duration_s() / 2)
    QApplication.processEvents()
    assert 0.0 < window.replay.position() < window.replay.duration_s()
    assert abs(panel.cursors[0].value() - window.replay.position()) < 0.05

    # Dragging the chart cursor scrubs the recording too, and pauses it.
    window.toolbar.btn_run.setChecked(True)
    QApplication.processEvents()
    assert window.toolbar.btn_run.text() == t("toolbar.playback_pause")
    panel.cursors[0].setValue(0.25)
    QApplication.processEvents()
    assert abs(window.replay.position() - 0.25) < 0.05
    assert not window.toolbar.btn_run.isChecked(), "dragging the cursor did not pause playback"

    # Leaving the view returns the charts to the live session.
    window.brand_bar.btn_live.click()
    QApplication.processEvents()
    assert not panel.is_recording_source()
    assert panel.mode() == "follow"
    assert window.toolbar.run_role() == "acquire", "the rail kept the transport"
    assert window.toolbar.btn_run.text() == t("toolbar.run_label")
    assert window.arrow_panel.view_modes() == ("arrows_pure", "arrows_stitched", "depth")
    assert "raw_0001" not in window.toolbar.source_summary.text(), (
        "the replay's video is still named in the live view"
    )


# ------------------------------------------------- correctness regressions


def test_a_late_calibration_does_not_plot_raw_counts_on_the_newton_axis(make_window):
    """A device confirms its calibration a frame or two after the first packets.

    Those frames carry raw counts. ``push`` used to record the new unit and keep
    the old samples, so the first thing drawn on the newton axis was a spike of
    raw counts — the transient at the start of every session. Switching units is
    a switch, never a reinterpretation: the raw samples are dropped from the
    buffer (the store still holds them) and the sample that triggered the switch
    is read out but not appended twice.
    """
    from orisys_app_shared.i18n import t

    window, stuck = _running_window(make_window)
    plots = window.force_plots
    # The preference is newton; an uncalibrated device falls back to raw.
    assert window.toolbar.units() == "newton"
    plots.reset()
    for index in range(3):
        packet = ui_check._fake_packet(index, calibrated_axes=())
        packet.force_calibrated = False
        stuck.emit(packet)
        window._on_run_tick()
    assert plots.unit() == "raw", f"an uncalibrated device is not shown raw: {plots.unit()}"

    for index in range(3, 40):
        stuck.emit(ui_check._fake_packet(index))
        window._on_run_tick()

    state = plots.history.state()
    assert plots.unit() == "N", f"the unit did not follow the calibration: {plots.unit()}"
    assert state is not None
    assert plots.history.sample_count == 37, (
        f"the raw frames stayed in the newton buffer: {plots.history.sample_count} samples"
    )
    peak = float(np.nanmax(np.abs(state.values[:, 0])))
    assert peak < 5.0, f"a raw count is still drawn on the newton axis (peak {peak})"

    # The sample that caused the switch still reaches the readouts; the early
    # return used to leave the cards showing the previous sample. The number on
    # the card is the *display* copy of it: this fake FN is a slow 2.0…2.4 N ramp
    # with no contact flagged, which is exactly the resting drift the display
    # baseline holds at zero. What matters here is that the card is not a raw
    # count, not the previous sample and not a dash.
    assert abs(plots._last_values[0] - (2.0 + 39 * 0.01)) < 1e-9
    assert plots.presentation.display_quality != "none", (
        "the display policy was not applied to the freshly shown newton unit"
    )
    assert plots.value_labels[0].text() == "0.000", plots.value_labels[0].text()
    assert plots.value_labels[0].text() != t("chart.value_unavailable")
    _finish(window, stuck)


def test_the_unit_chip_switches_the_charts_and_the_toolbar(make_window):
    """One click on the unit chip changes the unit everywhere, not just locally."""
    from orisys_app_shared.i18n import t
    from orisys_studio.ui.force_plots import unit_display
    from PySide6.QtWidgets import QPushButton

    window = _show(make_window(), (1440, 880))
    plots = window.force_plots
    assert isinstance(plots.unit_badge, QPushButton), "the unit chip is not clickable"
    assert plots.unit_badge.toolTip() == t("chart.unit_toggle_tip")
    assert plots.unit_badge.accessibleName() == t("chart.unit_toggle")

    before = plots.unit()
    plots.unit_badge.click()
    assert plots.unit() != before, "the unit chip did not switch the charts"
    assert plots.unit_badge.text() == unit_display(plots.unit())
    assert ("newton" if plots.unit() == "N" else "raw") == window.toolbar.units(), (
        "the unit chip and the toolbar disagree about the unit"
    )
    plots.unit_badge.click()
    assert plots.unit() == before, "the unit chip does not switch back"


def test_the_chart_actions_are_icons_that_still_say_what_they_do(make_window):
    """Symbols instead of words — but every one keeps its meaning in words.

    The header actions (zoom to fit, box zoom, back to latest) are drawn at
    runtime in the theme's text colour; a symbol with no tooltip or accessible
    name would be unreadable, so both are part of the contract.
    """
    from orisys_app_shared.i18n import t

    window = _show(make_window(), (1440, 880))
    plots = window.force_plots
    for button, key in (
        (plots.btn_overview, "chart.overview"),
        (plots.btn_box_zoom, "chart.box_zoom"),
        (plots.btn_latest, "chart.return_latest"),
    ):
        assert button.text() == "", f"{key} still shows text: {button.text()!r}"
        assert not button.icon().isNull(), f"{key} has no icon"
        assert button.toolTip() == t(f"{key}_tip")
        assert button.accessibleName() == t(key)

    # The overview strip keeps its word: it labels a region, not an action.
    assert plots.window_caption.text() == t("chart.overview")

    # The arrow footer says what the factor multiplies.
    footer = window.arrow_panel.scale_label.text()
    assert "×" in footer, footer
    assert "位移" in footer or "displacement" in footer, footer

    # A theme switch re-tints the icons instead of leaving stale pixels.
    window._set_theme("light")
    for button in (plots.btn_overview, plots.btn_box_zoom, plots.btn_latest):
        assert not button.icon().isNull(), "an icon vanished across a theme switch"


def test_a_recording_counts_up_while_it_is_running(make_window, record_root):
    """The elapsed time is the span captured so far, not just the final number."""
    import orisys_studio.app_window as app_module
    from orisys_app_shared.i18n import t

    window, stuck = _running_window(make_window)
    app_module.recordings_dir = lambda: record_root
    window.toolbar.btn_record.setChecked(True)
    for index in range(96):
        stuck.emit(ui_check._fake_packet(index, mono_t=index / 30.0))
        window._on_run_tick()

    stats = window.recorder.stats()
    assert stats.duration_s > 2.5, f"the live duration stayed at {stats.duration_s}"
    assert window.toolbar.record_chip.text() != t(
        "record.state_recording", duration="00:00.0"
    ), "the record strip does not count up while recording"
    window.toolbar.btn_record.setChecked(False)
    _finish(window, stuck)


def test_the_video_follows_the_sensor_rate_and_keeps_every_row(make_window, record_root):
    """The container rate is the sensor's, and pacing never thins the data.

    The packet's ``fps`` is how fast the pipeline *finished* frames, not how fast
    the sensor produces them: a burst at open (or a file source) reads 48 on a
    30 fps sensor, and writing every delivered frame into a 30 fps container made
    playback run at the wrong speed.
    """
    import csv

    import cv2
    import orisys_studio.app_window as app_module

    window, stuck = _running_window(make_window)
    app_module.recordings_dir = lambda: record_root
    assert abs(window._video_fps() - 30.0) < 0.01, window._video_fps()

    window.toolbar.btn_record.setChecked(True)
    for index in range(96):
        # 48 frames per second of acquisition time, above the configured 30.
        packet = ui_check._fake_packet(index, mono_t=index / 48.0)
        packet.fps = 48.0
        stuck.emit(packet)
        window._on_run_tick()
    window.toolbar.btn_record.setChecked(False)

    report = window._record_last_report
    assert report is not None and report.completed
    assert report.stats.resampled_video > 0, "the extra frames were not reported"
    assert any("faster than" in problem for problem in report.problems), report.problems

    with (report.directory / "frames.csv").open(encoding="utf-8") as handle:
        rows = list(csv.DictReader(handle))
    assert len(rows) == 96, f"the video pacing thinned the data rows: {len(rows)}"

    segments = sorted(report.directory.glob("raw_*.mp4"))
    assert segments, "the recording wrote no video segment"
    capture = cv2.VideoCapture(str(segments[0]))
    try:
        written = int(capture.get(cv2.CAP_PROP_FRAME_COUNT))
        container_fps = float(capture.get(cv2.CAP_PROP_FPS))
    finally:
        capture.release()
    assert abs(container_fps - 30.0) < 1.0, f"the video declares {container_fps} fps"
    assert 55 <= written <= 65, f"the video holds {written} frames for 2 s at 30 fps"
    _finish(window, stuck)


def test_a_replay_keeps_the_2d_pane_from_the_live_camera(
    make_window, replay_recording
):
    """The pane belongs to the source the view is showing.

    While the replay view is up, its frames own the 2D panel; a live packet used
    to paint over the recording. Leaving the view hands the pane back.
    """
    from PySide6.QtWidgets import QApplication

    window, stuck = _running_window(make_window)
    window.brand_bar.btn_playback.click()
    QApplication.processEvents()
    assert window._load_recording(replay_recording), "the replay could not open it"
    QApplication.processEvents()
    assert window._replay_owns_image(), "the replay does not own the 2D pane"

    label = window.arrow_panel.image_label
    # Park the playhead at the end of the recording and remember what the pane and
    # the cards show there, so a live packet that overwrote either would show up.
    window.replay.set_position(window.replay.duration_s())
    QApplication.processEvents()
    before_key = label.pixmap().cacheKey()
    before_text = label.text()
    before_card = window.force_plots.value_labels[0].text()
    live = np.full((24, 32, 3), 200, np.uint8)
    for index in range(3):
        packet = ui_check._fake_packet(index, mono_t=index / 30.0, frame=live)
        packet.normal_force = 111.0
        packet.normal_force_raw = 999.0
        stuck.emit(packet)
        window._on_run_tick()
    QApplication.processEvents()
    assert label.pixmap().cacheKey() == before_key and label.text() == before_text, (
        "a live frame overwrote the recording in the 2D pane"
    )
    assert window.force_plots.value_labels[0].text() == before_card, (
        "a live sample overwrote the recording's readout"
    )

    # ...and the live view takes it back, which is what makes the check above
    # meaningful rather than a dead pane.
    window.brand_bar.btn_live.click()
    QApplication.processEvents()
    assert not window._replay_owns_image()
    stuck.emit(ui_check._fake_packet(9, mono_t=9 / 30.0, frame=live))
    window._on_run_tick()
    QApplication.processEvents()
    assert label.pixmap().cacheKey() != before_key, "the live view stopped drawing"
    _finish(window, stuck)


def test_the_readout_describes_the_point_the_cursor_is_on(
    make_window, replay_recording
):
    """The three numbers are the cursor's sample, not the last live packet.

    A replay used to state the live acquisition in cards sitting next to a chart
    of 7.5e5 raw counts, which reads as "the replay never opened".
    """
    from orisys_app_shared.i18n import t
    from PySide6.QtWidgets import QApplication

    window = _show(make_window(), (1440, 880))
    window.brand_bar.btn_playback.click()
    QApplication.processEvents()
    assert window._load_recording(replay_recording)
    QApplication.processEvents()
    plots = window.force_plots
    assert plots.mode() == "browse", "opening a recording did not browse it"

    window.replay.set_position(0.0)
    QApplication.processEvents()
    first = plots.value_labels[0].text()
    assert first not in ("", t("chart.value_unavailable")), first
    window.replay.set_position(window.replay.duration_s())
    QApplication.processEvents()
    last = plots.value_labels[0].text()

    # The fixture's forces rise monotonically, so the readout must rise too: the
    # cards are following the playhead rather than a constant.
    assert float(last) > float(first), f"the readout ignores the cursor: {first} -> {last}"
    assert float(first) != 0.0, "a recording is read out as a live zero"
    assert abs(plots.cursor_time() - window.replay.position()) < 0.05


def test_a_raw_only_recording_is_never_shown_in_newton(make_window, replay_recording):
    """A newton preference must not empty a recording that has no calibration.

    The recording's raw counts are always there; its newton triplet only exists
    for the axes it calibrated. Asking for newton anyway drew three blank charts
    and a dash in every card, which looks exactly like "the replay did not load".
    """
    from orisys_app_shared.i18n import t
    from PySide6.QtWidgets import QApplication

    window = _show(make_window(), (1440, 880))
    window.toolbar.set_units("newton")
    QApplication.processEvents()
    window.brand_bar.btn_playback.click()
    QApplication.processEvents()
    assert window._load_recording(replay_recording)
    QApplication.processEvents()

    panel = window.force_plots
    assert panel.unit() == "raw", "a raw-only recording was shown in newton"
    assert window.toolbar.units() == "raw", "the toolbar disagrees with the charts"
    assert panel.unit_badge.text() == t("units.raw_short"), (
        "the chart's unit chip disagrees with the charts"
    )
    drawn = [int(curve.getData()[0].size) for curve in panel.curves]
    assert all(count > 0 for count in drawn), f"the recording drew nothing: {drawn}"
    assert panel.value_labels[0].text() not in ("", t("chart.value_unavailable"))


def test_the_replay_transport_plays_and_pauses(make_window, replay_recording):
    """Play/pause like an editor: 1× forward, and a manual gesture takes over."""
    import time

    from PySide6.QtWidgets import QApplication

    window = _show(make_window(), (1440, 880))
    window.brand_bar.btn_playback.click()
    QApplication.processEvents()
    assert window._load_recording(replay_recording)
    QApplication.processEvents()
    panel = window.force_plots

    assert window.toolbar.btn_run.isEnabled() and not window.toolbar.btn_run.isChecked()
    window.toolbar.btn_run.setChecked(True)
    started = time.perf_counter()
    for _ in range(10):
        QApplication.processEvents()
        time.sleep(0.03)
    elapsed = time.perf_counter() - started
    assert window.replay.position() > 0.05, "play did not advance the playhead"
    assert window.replay.position() <= elapsed + 0.2, (
        f"the playhead ran ahead of the clock: {window.replay.position()} > {elapsed}"
    )
    assert abs(panel.cursors[0].value() - window.replay.position()) < 0.05, (
        "the chart cursor did not follow the transport"
    )

    # Dragging the cursor is a manual gesture: playback pauses where it is.
    panel.cursors[0].setValue(0.2)
    QApplication.processEvents()
    assert not window.toolbar.btn_run.isChecked(), "dragging the cursor did not pause"
    assert abs(window.replay.position() - 0.2) < 0.05
    parked = window.replay.position()
    for _ in range(6):
        QApplication.processEvents()
        time.sleep(0.03)
    assert window.replay.position() == parked, "the playhead kept moving while paused"


def test_the_recompute_mode_reruns_the_pipeline_over_the_video(
    make_window, replay_recording
):
    """Off: the recorded CSV. On: the recorded video through the vision chain."""
    from PySide6.QtWidgets import QApplication

    window = _show(make_window(), (1440, 880))
    window.brand_bar.btn_playback.click()
    QApplication.processEvents()
    assert window._load_recording(replay_recording)
    QApplication.processEvents()
    panel = window.force_plots
    assert panel.is_recording_source(), "the charts do not read the recording"
    assert window.act_recompute.isEnabled(), "the recompute switch is not offered"

    started: list = []

    def fake_run() -> None:
        started.append(True)
        window.session.set_running(True)

    window._start_run = fake_run
    window.act_recompute.setChecked(True)
    QApplication.processEvents()
    assert started == [True], f"the pass started {len(started)} times"
    assert not panel.is_recording_source(), "the charts still read the CSV"
    assert window.toolbar.source_mode() == "video"
    assert window.toolbar.video_path().endswith(".mp4"), window.toolbar.video_path()
    assert window.toolbar.btn_run.isChecked(), (
        "the transport does not show the pass as running"
    )

    window._recompute_running = True
    window.act_recompute.setChecked(False)
    QApplication.processEvents()
    assert panel.is_recording_source(), "turning the recompute off did not restore the CSV"
    assert not window.toolbar.btn_run.isChecked(), "the transport stayed checked"


def test_the_replay_view_offers_a_stop_that_always_works(make_window, replay_recording):
    """The operator must not have to work out *what* is stuck before stopping it.

    The transport is a play/pause toggle, which is ambiguous exactly when something is
    wrong. So the rail's Stop button — the same one the live view uses to end a session
    — is an unconditional stop in this view, and it covers both things that can run
    there: plain playback and a recompute pass. The tracker reset owns no device here,
    so it is disabled rather than repurposed.
    """
    from orisys_app_shared.i18n import t
    from PySide6.QtWidgets import QApplication

    window = _show(make_window(), (1440, 880))
    window.brand_bar.btn_playback.click()
    QApplication.processEvents()
    assert window._load_recording(replay_recording)
    QApplication.processEvents()

    assert not window.toolbar.btn_reset.isEnabled(), (
        "the replay view offers to zero a device tracker it has not got"
    )
    assert window.toolbar.btn_reset.text() == t("toolbar.reset")
    assert window.toolbar.btn_stop.text() == t("toolbar.stop_label")
    assert not window.toolbar.btn_stop.isEnabled(), (
        "a stop is offered while nothing is running"
    )

    # Plain playback: the stop button appears while it plays and pressing it stops.
    window.toolbar.btn_run.setChecked(True)
    QApplication.processEvents()
    assert window._play_timer.isActive()
    assert window.toolbar.btn_stop.isEnabled(), "no stop offered while playing"
    window.toolbar.btn_stop.click()
    QApplication.processEvents()
    assert not window._play_timer.isActive(), "the stop did not stop the playback"
    assert not window.toolbar.btn_run.isChecked(), "the transport still shows playing"
    assert t("toolbar.stopped_playback") in window.statusBar().currentMessage(), (
        window.statusBar().currentMessage()
    )

    # A recompute pass: the same button stops it, without stopping the recording.
    stopped: list = []
    window._stop_run = lambda **kwargs: stopped.append(kwargs.get("reason"))
    window._recompute_running = True
    window._update_run_enabled()
    assert window.toolbar.btn_stop.isEnabled(), "no stop offered while a pass runs"
    window.toolbar.btn_stop.click()
    QApplication.processEvents()
    assert stopped == ["user_stop"], stopped
    assert t("toolbar.stopped_pass") in window.statusBar().currentMessage(), (
        window.statusBar().currentMessage()
    )

    # Nothing running: it says so instead of doing nothing at all.
    # (The pass is over, so the stop button is correctly disabled — the escape hatch is
    # therefore exercised the way Esc reaches it, through the controller.)
    assert not window.toolbar.btn_stop.isEnabled(), (
        "a stop is still offered after the pass was stopped"
    )
    window.replay_ctl.stop_activity()
    QApplication.processEvents()
    assert t("toolbar.nothing_to_stop") in window.statusBar().currentMessage(), (
        window.statusBar().currentMessage()
    )
    window.close()


def test_escape_stops_the_replay_too(make_window, replay_recording):
    """Esc is the documented way out; in the replay view it stops the replay."""
    from PySide6.QtWidgets import QApplication

    window = _show(make_window(), (1440, 880))
    window.brand_bar.btn_playback.click()
    QApplication.processEvents()
    assert window._load_recording(replay_recording)
    QApplication.processEvents()
    window.toolbar.btn_run.setChecked(True)
    QApplication.processEvents()
    assert window._play_timer.isActive()
    window.act_stop.trigger()
    QApplication.processEvents()
    assert not window._play_timer.isActive(), "Esc did not stop the playback"
    assert not window.toolbar.btn_run.isChecked()
    window.close()


def test_the_live_view_keeps_the_tracker_reset(make_window):
    from orisys_app_shared.i18n import t
    from PySide6.QtWidgets import QApplication

    window = _show(make_window(), (1440, 880))
    window.brand_bar.btn_live.click()
    QApplication.processEvents()
    assert window.toolbar.btn_reset.text() == t("toolbar.reset"), (
        "the rail's reset slot is not the tracker reset in the live view"
    )
    window.close()


def test_the_tracker_reset_follows_the_session_across_a_view_switch(make_window):
    """Zeroing the tracker is a *device* action: which panel is on screen is not a fact
    about the session, so switching live → calibration → live must not take the reset
    away from a session that is still running.

    The reported defect: with a session running, opening the 标定 view left the button
    unavailable, and coming back to 实时 did not restore it — the session was unchanged
    throughout. The state asserted at every step is the session's, so the test fails if
    the view switch is what drives the control rather than the session.
    """
    from orisys_app_shared.i18n import t
    from PySide6.QtWidgets import QApplication

    window = _show(make_window(sensor_type="box", source_mode="camera"), (1440, 880))
    stuck = ui_check._StuckWorker()
    window._ensure_workers = lambda: None
    window._box_worker = stuck
    window._finger_worker = stuck
    window._start_run()
    window._run_timer.stop()
    try:
        # A first frame is what makes the session a *running* one: the phase, and with it
        # the device controls, key off it (see the rail's own rule).
        stuck.emit(ui_check._fake_packet(1))
        window._on_run_tick()
        assert window._session_phase == "running", window._session_phase
        assert window.toolbar.btn_reset.isEnabled() and window.act_reset.isEnabled(), (
            "a running session must offer the tracker reset before any view switch"
        )
        assert window.toolbar.btn_reset.text() == t("toolbar.reset")

        window.brand_bar.btn_calibration.click()
        QApplication.processEvents()
        assert window.layout_ctl.view_preset == "calibration"
        assert window.toolbar.btn_reset.isEnabled() and window.act_reset.isEnabled(), (
            "the session still runs in the calibration view: the reset went unavailable"
        )

        window.brand_bar.btn_live.click()
        QApplication.processEvents()
        assert window.layout_ctl.view_preset == "live"
        assert window.toolbar.btn_reset.isEnabled() and window.act_reset.isEnabled(), (
            "the return to the live view did not restore the session's reset"
        )
    finally:
        window._stop_run(reason="user_stop")
        stuck.release()


def test_the_two_figures_are_drawn_from_one_arrow_policy(make_window, monkeypatch):
    """The 2D canvas and the 3D surface must sample the same policy.

    The pane owns the arrow thresholds (they are display settings and are persisted),
    so the 2D renderer is handed a policy built from that same object rather than
    inventing its own. A canvas that picks its own threshold is how the two figures
    ended up drawing a different number of arrows for one frame (measured: 432 against
    622 on a real recording, differing on 34 of 41 frames).
    """
    import orisys_studio.app_window as app_window
    from orisys_app_shared.acquisition.image_backend import ImageFrame
    from orisys_app_shared.scene3d.visual_policy import policy_for_settings

    seen: dict = {}

    def spy(frame, plan=None, **kwargs):
        seen.update(kwargs)
        return None  # the panel is not the subject here

    monkeypatch.setattr(app_window, "render_image", spy)
    window = _show(make_window(sensor_type="finger"), (1440, 880))
    expected = policy_for_settings(window.mesh3d_panel.display_settings())
    assert window._arrow_policy() == expected

    flow = np.zeros((12, 16, 2), dtype=np.float32)
    window._show_image_frame(
        ImageFrame(np.zeros((12, 16, 3), np.uint8), flow=flow, flow_valid=True)
    )
    assert seen.get("arrow_policy") == expected, (
        "the 2D canvas was not drawn with the pane's arrow policy"
    )
    window.close()


def test_a_bare_video_plays_even_though_it_is_not_a_recording(make_window, record_root):
    """A clip with no forces.csv beside it is still something to watch.

    An operator who points at a video expects the transport to play it. Opening the
    video's own folder as a *recording* used to "succeed" against the tolerant reader
    and then play a zero-length timeline ("pressing 回放 does nothing"), so the fix is
    not to refuse the file but to play it as what it is: a video, with empty charts.
    """
    import time as _time

    import cv2
    import numpy as np
    from orisys_app_shared.i18n import t
    from PySide6.QtWidgets import QApplication

    bare = Path(record_root) / "bare_video.mp4"
    writer = cv2.VideoWriter(
        str(bare), cv2.VideoWriter_fourcc(*"mp4v"), 30.0, (64, 48)
    )
    for index in range(30):
        writer.write(np.full((48, 64, 3), index * 8, dtype=np.uint8))
    writer.release()
    assert bare.is_file()

    window = _show(make_window(), (1440, 880))
    try:
        window.brand_bar.btn_playback.click()
        QApplication.processEvents()
        assert not window.replay.has_video()
        assert window._load_replay_video(bare) is True, "a playable video was refused"
        QApplication.processEvents()
        assert window.replay.has_video(), "nothing is playable"
        assert window.replay.is_video_only(), "a bare video was taken for a recording"
        assert not window.replay.is_loaded(), (
            "a bare video must not claim to carry a recording's measurements"
        )
        assert window.replay.duration_s() > 0.5, window.replay.duration_s()
        assert window.toolbar.btn_run.isEnabled(), "the transport is not offered"
        assert t("toolbar.playback_video_only") in window.toolbar.btn_run.toolTip(), (
            window.toolbar.btn_run.toolTip()
        )
        assert t("playback.video_only_notice") in window.replay.warnings_text()
        # The charts have nothing to read, and say so rather than drawing zeros.
        assert not window.force_plots.is_recording_source()

        window.toolbar.btn_run.setChecked(True)
        QApplication.processEvents()
        deadline = _time.time() + 3.0
        while _time.time() < deadline and window.replay.position() < 0.4:
            QApplication.processEvents()
            _time.sleep(0.05)
        assert window.replay.position() >= 0.4, (
            f"the transport did not play the video: {window.replay.position()}"
        )
        assert window._play_timer.isActive()
        image = window.replay.video_image()
        assert image is not None and not image.isNull(), "no frame was decoded"
        window._stop_replay_activity()
        QApplication.processEvents()
        assert not window._play_timer.isActive()
    finally:
        window.close()


def test_the_replay_and_the_live_paths_share_one_image_backend(make_window, record_root):
    """Stage 7: one renderer for every 2D producer, and modes from the frame itself.

    A recording stores the raw camera image and nothing else, so its plan offers exactly
    one view and says why; a recomputed (or live) frame offers the derived views and goes
    through the *same* ``render_image``. Before this, the replay path handed a QImage
    straight to the panel while live/recompute went through two different drawing calls.
    """
    import cv2
    import numpy as np
    import orisys_studio.app_window as app_module
    from orisys_app_shared.acquisition.image_backend import (
        DERIVED_MODES,
        SOURCE_LIVE,
        SOURCE_RECOMPUTE,
        ImageFrame,
    )
    from PySide6.QtWidgets import QApplication

    bare = Path(record_root) / "backend_video.mp4"
    writer = cv2.VideoWriter(str(bare), cv2.VideoWriter_fourcc(*"mp4v"), 30.0, (64, 48))
    for index in range(30):
        writer.write(np.full((48, 64, 3), index * 8, dtype=np.uint8))
    writer.release()
    assert bare.is_file()

    window = _show(make_window(), (1440, 880))
    original = app_module.render_image
    seen: list = []

    def spy(frame, plan=None, **kwargs):
        seen.append((frame.source, kwargs.get("mode")))
        return original(frame, plan, **kwargs)

    app_module.render_image = spy
    try:
        window._apply_view_preset("replay")
        assert window._load_replay_video(bare) is True
        window._render_replay_frame()
        QApplication.processEvents()
        assert window.arrow_panel.plan_modes() == ("recorded",), (
            "a recording must not offer a derived view"
        )
        assert seen and seen[-1][0] == "replay"
        note = window.arrow_panel.note_label.text()
        assert note and note != "panels.replay_raw_note", note
        assert window.arrow_panel.view_combo.count() == 1

        # The pipeline drawing over the same footage: derived modes, same backend.
        window.arrow_panel.set_source_kind("recompute")
        shape = (48, 64)
        window._show_image_frame(
            ImageFrame(
                np.zeros((*shape, 3), dtype=np.uint8),
                flow=np.ones((*shape, 2), dtype=np.float32),
                depth=np.zeros(shape, dtype=np.float32),
                source=SOURCE_RECOMPUTE,
                frame_id=7,
            )
        )
        assert window.arrow_panel.plan_modes() == DERIVED_MODES
        assert seen[-1] == ("recompute", "arrows_pure")
        assert window.arrow_panel.view_combo.count() == len(DERIVED_MODES)

        # And the live packet path is the same sink (through the same spy).
        window._show_image_frame(
            ImageFrame(
                np.full((*shape, 3), 9, dtype=np.uint8),
                flow=np.ones((*shape, 2), dtype=np.float32),
                source=SOURCE_LIVE,
                frame_id=8,
            )
        )
        assert seen[-1][0] == "live"
    finally:
        app_module.render_image = original
        window.close()


def test_the_application_converts_bgr_to_qimage_in_one_place():
    """Two conversions is how the same frame looks different on two paths."""
    import orisys_studio.app_window as app_module
    import orisys_studio.ui.arrow_panel as arrow_panel

    assert app_module._bgr_to_qimage is arrow_panel.bgr_to_qimage
    root = Path(app_module.__file__).resolve().parent
    others = sorted(
        path.name
        for path in root.rglob("*.py")
        if path.name != "arrow_panel.py"
        and "def bgr_to_qimage" in path.read_text(encoding="utf-8")
    )
    assert others == [], f"another BGR→QImage conversion exists: {others}"


def test_the_replay_entries_exist_only_in_the_replay_view(make_window, record_root):
    """Stage 7: the live view has no replay entry, and says where they live.

    Opening a video from the live view used to set the acquisition source to a file
    while the 2D panel kept showing the camera and Run acquired from the video — a state
    nothing on screen described.
    """
    import cv2
    import numpy as np
    from orisys_app_shared.i18n import t
    from PySide6.QtWidgets import QApplication

    bare = Path(record_root) / "gated_video.mp4"
    writer = cv2.VideoWriter(str(bare), cv2.VideoWriter_fourcc(*"mp4v"), 30.0, (64, 48))
    for index in range(10):
        writer.write(np.full((48, 64, 3), index * 8, dtype=np.uint8))
    writer.release()

    window = _show(make_window(), (1440, 880))
    try:
        window._apply_view_preset("live")
        QApplication.processEvents()
        for action in (window.act_open_video, window.act_playback, window.act_playback_latest):
            assert not action.isEnabled(), "a replay entry is offered in the live view"
            assert t("toolbar.replay_view_only") in action.toolTip()
        assert not window.toolbar.btn_replay_video.isVisible()
        assert not window.toolbar.btn_recompute.isEnabled()

        # Programmatic use is refused too, and leaves nothing half-changed.
        assert window._load_replay_video(bare) is False
        QApplication.processEvents()
        assert not window.replay.has_video()
        assert window.toolbar.source_mode() == "camera"
        assert not window._play_timer.isActive()
        window._on_play_shortcut()
        assert not window._play_timer.isActive(), "Space started a replay in the live view"

        # In the replay view they are offered again, and the recompute entry follows
        # whether there is anything to recompute from.
        window._apply_view_preset("replay")
        QApplication.processEvents()
        for action in (window.act_open_video, window.act_playback, window.act_playback_latest):
            assert action.isEnabled()
        assert window._load_replay_video(bare) is True
        QApplication.processEvents()
        assert window.arrow_panel.plan_modes() == ("recorded",)
        assert window.toolbar.btn_recompute.isEnabled(), (
            "a video with no recording beside it can still be recomputed"
        )
        window.toolbar.btn_recompute.click()
        QApplication.processEvents()
        assert window.act_recompute.isChecked(), "the rail's recompute entry did not toggle"
        window.act_recompute.setChecked(False)
    finally:
        window.close()


def test_a_file_that_is_not_a_video_at_all_is_refused_with_a_reason(
    make_window, record_root
):
    """Not a recording *and* not decodable: say what is missing and offer recompute."""
    from PySide6.QtWidgets import QApplication

    broken = Path(record_root) / "not_really_a_video.mp4"
    broken.write_text("this is not a video at all\n", encoding="utf-8")

    window = _show(make_window(), (1440, 880))
    try:
        window.brand_bar.btn_playback.click()
        QApplication.processEvents()
        assert window._load_replay_video(broken) is False, (
            "a file that cannot be decoded was accepted for playback"
        )
        QApplication.processEvents()
        assert not window.replay.has_video()
        assert not window.toolbar.btn_run.isEnabled(), (
            "the transport is offered although there is nothing to play"
        )
        reason = window.statusBar().currentMessage()
        assert "forces.csv" in reason or "记录" in reason, reason
        # The way forward for a video with no recording: recompute from it.
        assert window.act_recompute.isEnabled(), (
            "a chosen video cannot be recomputed either, so the operator has no way to "
            "look at it"
        )
    finally:
        window.close()


def test_a_video_inside_a_recording_opens_the_recording_and_plays(
    make_window, replay_recording
):
    from orisys_app_shared.i18n import t
    from PySide6.QtWidgets import QApplication

    window = _show(make_window(), (1440, 880))
    window.brand_bar.btn_playback.click()
    QApplication.processEvents()
    segments = sorted(Path(replay_recording).glob("raw_*.mp4"))
    assert segments, "the fixture wrote no video segment"
    assert window._load_replay_video(segments[0]) is True
    QApplication.processEvents()
    assert window.replay.is_loaded()
    assert window.toolbar.btn_run.isEnabled(), "the transport is not offered"
    assert t("toolbar.playback_needs_recording") not in window.toolbar.btn_run.toolTip(), (
        "a loaded recording is still described as one that cannot be played"
    )
    window.toolbar.btn_run.setChecked(True)
    QApplication.processEvents()
    assert window._play_timer.isActive(), "pressing 回放 did not start playback"
    window._pause_playback()
    window.close()


def test_a_recording_without_a_video_says_it_cannot_be_played(make_window, record_root):
    """The defensive case: a recording whose video segments are gone."""
    import csv
    import json

    from orisys_app_shared.i18n import t
    from PySide6.QtWidgets import QApplication

    directory = Path(record_root) / "no_video_recording"
    directory.mkdir(parents=True, exist_ok=True)
    (directory / "session.json").write_text(
        json.dumps({"format_version": 1, "device": {"sensor_type": "finger"}}),
        encoding="utf-8",
    )
    with (directory / "forces.csv").open("w", encoding="utf-8", newline="") as handle:
        writer = csv.writer(handle)
        writer.writerow(["session_id", "frame_id", "t_rel_s", "FN_raw"])
        writer.writerow([1, 1, 0.0, 1.0])

    window = _show(make_window(), (1440, 880))
    window.brand_bar.btn_playback.click()
    QApplication.processEvents()
    if not window._load_recording(directory):
        pytest.skip("this recording layout was refused before it could be played")
    QApplication.processEvents()
    assert window.replay.duration_s() <= 0.0
    window._start_playback()
    QApplication.processEvents()
    assert not window._play_timer.isActive()
    assert t("playback.empty_recording")[:8] in window.statusBar().currentMessage(), (
        window.statusBar().currentMessage()
    )
    window.close()


# ------------------------------------------- selection readout and notices


def test_a_selection_moves_its_statistics_onto_the_value_cards(make_window):
    """The per-channel line under the charts did not fit; the cards hold it now.

    Selecting a window makes the big number that window's peak and the line under
    it its mean · σ. The strip keeps only how big the selection is, and leaving
    the selection puts the cursor readout back.
    """
    from orisys_app_shared.i18n import t

    window, stuck = _running_window(make_window)
    window.toolbar.units_combo.setCurrentIndex(0)  # newton
    window.force_plots.reset()
    for index in range(90):
        stuck.emit(ui_check._fake_packet(index))
        window._on_run_tick()

    plots = window.force_plots
    assert plots._selection is None, "following live is not a selection"
    assert plots.stats_label.text() == ""
    assert plots.value_details[0].text() == "", "a live reading carries a mean line"

    plots.set_window(1.0, 3.0)
    assert plots.mode() == "browse"
    assert plots._selection is not None, "the window was not read as a selection"

    summary = plots.stats_label.text()
    assert summary, "the strip does not state the size of the selection"
    assert t("chart.selection_summary", duration="1", samples=2)[:4] in summary or (
        "选区" in summary or "Selection" in summary
    ), summary
    # The numbers a reader cannot fit in the strip are on the cards instead.
    expected_peak = float(plots._selection.peaks[0])
    expected = f"{expected_peak:.3f}"
    assert plots.value_labels[0].text() == expected, (
        f"the FN card is not the selection's peak: {plots.value_labels[0].text()!r}"
    )
    detail = plots.value_details[0].text()
    assert detail and detail != "", detail
    assert f"{float(plots._selection.means[0]):.4g}" in detail, (detail, plots._selection.means[0])
    assert "均" in detail or "mean" in detail, detail
    assert plots.value_labels[0].toolTip(), "the peak is not explained anywhere"

    # "Whole session" is the default fit, so it is not a selection.
    plots.show_all()
    assert plots._selection is None, "'whole session' is still treated as a selection"
    assert plots.value_details[0].text() == ""

    # ...and neither is live mode.
    plots.set_window(1.0, 3.0)
    assert plots._selection is not None
    plots.follow_latest()
    assert plots._selection is None, "the selection survived 'back to latest'"
    assert plots.stats_label.text() == ""
    _finish(window, stuck)


def test_the_status_bar_is_a_notice_line_not_a_state_line(make_window):
    """The rail is the state; the bar shows one-off notices and lets them expire.

    A permanent "config sensor.json" line repeated what the rail's sensor chip
    already says, and a message with no timeout (the old "运行中（0）") stayed under
    the window for the whole session.
    """
    import time

    import orisys_studio.app_window as app_module
    from PySide6.QtWidgets import QApplication

    window = _show(make_window(), (1440, 880))
    assert not hasattr(window, "device_label"), (
        "the status bar still carries a permanent device line"
    )
    assert isinstance(window.statusBar(), app_module._NoticeBar)

    # Qt's default is msecs=0, which means "no timeout": a message that never
    # expires is what left an hour-old "运行中（0）" under the window.
    window.statusBar().showMessage("plain call")
    assert window.statusBar().currentMessage() == "plain call"

    original_timeout = app_module._NoticeBar.DEFAULT_TIMEOUT_MS
    app_module._NoticeBar.DEFAULT_TIMEOUT_MS = 40
    try:
        window.statusBar().showMessage("expiring notice")
        assert window.statusBar().currentMessage() == "expiring notice"
        deadline = time.perf_counter() + 1.5
        while time.perf_counter() < deadline:
            QApplication.processEvents()
            if window.statusBar().currentMessage() == "":
                break
            time.sleep(0.01)
        assert window.statusBar().currentMessage() == "", (
            "a notice stayed on the status bar after its timeout"
        )
    finally:
        app_module._NoticeBar.DEFAULT_TIMEOUT_MS = original_timeout

    window._notify("")
    assert window.statusBar().currentMessage() == ""
    window._notify("something happened")
    assert window.statusBar().currentMessage() == "something happened"

    # The rail states the phase, so the bar does not repeat it.
    window, stuck = _running_window(make_window)
    assert window.toolbar.status_chip.text().strip(), "the rail lost its phase chip"
    _finish(window, stuck)


def test_the_rail_reads_the_rate_and_what_it_cost(qt_app, make_window):
    """A frame rate alone cannot say whether we or the camera are the slow part.

    ``packet.process_ms`` is the whole per-frame cost, so the rail shows it next
    to the rate: "16.7 FPS · 58 ms" means the loop cannot keep up, while
    "16.7 FPS · 6 ms" means the camera is only delivering 16.7.
    """
    window = make_window()
    window._show_fps = True
    window.session.latest_fps = 16.67
    window.session.latest_process_ms = 58.4
    window._refresh_status_rail()
    text = window.toolbar.source_summary.text()
    assert "16.7 FPS" in text, text
    assert "58 ms" in text, text

    # Without a measured cost the rate is still shown, on its own.
    window.session.latest_process_ms = None
    window._refresh_status_rail()
    assert window.toolbar.source_summary.text().strip().endswith("FPS")
    window.close()


def test_the_camera_probe_is_usable_without_a_camera(capsys):
    """The probe has to be safe to run on a machine with no camera attached."""
    import camera_probe

    assert camera_probe.main(["--index", "9"]) == 1
    out = capsys.readouterr().out
    assert "No camera answered" in out
    assert "with the app closed" in out, "the probe must say why it found nothing"
    # The fourcc round trip is what makes the table readable.
    assert camera_probe._decode(camera_probe._fourcc_code("MJPG")) == "MJPG"
    assert camera_probe._decode(0) == "-"
    # Acceptance mode: one line, one exit code, no camera means failure.
    assert camera_probe.main(["--check", "--index", "9", "--samples", "2"]) == 1
    check_out = capsys.readouterr().out
    assert "No camera answered on index 9" in check_out


# ------------------------------------------------------- plot settings dialog
def test_the_chart_gear_opens_the_settings_dialog(qt_app, make_window):
    """The gear is the one place the filters can be changed from the UI."""
    window = make_window()
    captured = []
    window._on_plot_settings = lambda: captured.append(True)
    window.force_plots.plot_settings_requested.disconnect()
    window.force_plots.plot_settings_requested.connect(window._on_plot_settings)
    window.force_plots.btn_settings.click()
    assert captured == [True], "the gear did not ask for the settings dialog"
    assert window.force_plots.btn_settings.toolTip()
    window.close()


def test_the_filter_section_is_a_preset_and_a_custom_shape(qt_app):
    """A preset means its values; editing one turns the choice into "custom"."""
    from orisys_app_shared.force.filters import FilterSettings
    from orisys_studio.ui.plot_settings_dialog import PlotSettingsDialog

    dialog = PlotSettingsDialog(filters=FilterSettings(preset="balanced"))
    assert dialog.selected_preset() == "balanced"
    assert dialog.filter_values().describe() == "flowEMA(0.5) + median(3)"

    dialog.median_spin.setValue(7)
    assert dialog.selected_preset() is None, "an edited preset must stop claiming the name"
    assert dialog.filter_values().describe() == "flowEMA(0.5) + median(7)"

    dialog.preset_combo.setCurrentIndex(3)  # low_noise
    assert dialog.filter_values().describe() == "flowEMA(0.3) + median(3) + lowpass(10Hz,order2)"

    # A cutoff the device would drop is stated before the session starts.
    dialog.lowpass_spin.setValue(30.0)
    assert "Nyquist" in dialog.filter_warning.text() or "奈奎斯特" in dialog.filter_warning.text()

    dialog._reset_defaults()
    assert dialog.selected_preset() == "off"
    assert dialog.filter_values().active() is False
    assert dialog.filter_note.text(), "the dialog should say that nothing is filtered"


def test_the_filter_controls_are_locked_while_a_session_runs(qt_app):
    from orisys_app_shared.force.filters import FilterSettings
    from orisys_studio.ui.plot_settings_dialog import PlotSettingsDialog

    dialog = PlotSettingsDialog(filters=FilterSettings(), filters_locked=True)
    assert not dialog.filters_group.isEnabled()
    assert dialog.filter_note.text(), "a locked dialog has to say why"
    # Reading the values still works: the operator can see what is running.
    assert dialog.filter_values().active() is False


def test_the_dialog_writes_the_keys_the_session_reads_back(qt_app):
    """The dialog's own vocabulary must be what ``_filter_settings`` reads."""
    from orisys_app_shared.force.filters import FilterSettings, settings_from_mapping

    settings = FilterSettings(
        flow_ema_alpha=0.5, median_window=3, lowpass_hz=10.0, show_unfiltered=True,
        preset="low_noise",
    )
    stored = {f"plot_{key}": value for key, value in settings.as_dict().items()}
    read_back = settings_from_mapping(
        {key.removeprefix("plot_"): value for key, value in stored.items()}
    )
    assert read_back == settings.normalised()
    assert read_back.describe() == "flowEMA(0.5) + median(3) + lowpass(10Hz,order2)"


def test_the_plot_dialog_carries_the_ranges_and_the_zero_threshold(qt_app):
    """FN has a lower bound (which may be negative); both units a deadband."""
    from orisys_studio.ui.plot_settings_dialog import PlotSettingsDialog

    dialog = PlotSettingsDialog(
        units="newton", fn_min=-2.0, fn_max=6.0, deadband_n=0.25, deadband_raw=2000.0
    )
    assert dialog.settings()["fn_min"] == -2.0
    assert dialog.settings()["fn_max"] == 6.0
    assert dialog.deadbands() == {"deadband_n": 0.25, "deadband_raw": 2000.0}
    # Only the half that belongs to the unit being shown can be edited.
    assert dialog.fn_min_spin.isEnabled() and not dialog.fn_raw_min_spin.isEnabled()
    assert dialog.deadband_n_spin.isEnabled()
    assert not dialog.deadband_raw_spin.isEnabled()

    raw = PlotSettingsDialog(units="raw")
    assert raw.fn_raw_min_spin.isEnabled() and not raw.fn_min_spin.isEnabled()
    assert raw.deadband_raw_spin.isEnabled() and not raw.deadband_n_spin.isEnabled()
    raw.fn_raw_min_spin.setValue(-50000.0)
    raw.deadband_raw_spin.setValue(5000.0)
    assert raw.settings()["fn_raw_min"] == -50000.0

    raw._reset_defaults()
    assert raw.settings()["fn_raw_min"] == 0.0
    assert raw.settings()["fn_min"] == 0.0
    assert raw.settings()["window_sec"] == 4.0
    assert raw.deadbands() == {"deadband_n": 0.0, "deadband_raw": 0.0}, (
        "the shipped deadband answer is 'auto'"
    )


def test_the_plot_dialog_values_reach_the_chart(make_window):
    """Dialog -> controller -> panel: where an operator's range actually lands."""
    from orisys_studio.ui.plot_settings_dialog import PlotSettingsDialog

    window = make_window()
    dialog = PlotSettingsDialog(
        units="newton",
        window_sec=6.0,
        fn_min=-2.0,
        fn_max=6.0,
        shear_max=3.0,
        fn_raw_min=-1000.0,
        fn_raw_max=5e5,
        shear_raw_max=2e5,
        deadband_n=0.25,
        deadband_raw=3000.0,
    )
    window.display_ctl.apply_plot_settings(dialog.settings())

    plots = window.force_plots
    assert (plots._fn_min, plots._fn_max, plots._shear_max) == (-2.0, 6.0, 3.0)
    assert (plots._fn_raw_min, plots._fn_raw_max, plots._shear_raw_max) == (
        -1000.0, 5e5, 2e5,
    )
    assert plots.presentation.min_deadband_for("N") == 0.25
    assert plots.presentation.min_deadband_for("raw") == 3000.0
    assert window.prefs["plot_fn_min"] == -2.0
    assert window.prefs["plot_deadband_raw"] == 3000.0
    assert plots.history.window_sec == 6.0
    # And the dialog would open on the same numbers next time.
    assert window.display_ctl.plot_settings()["fn_min"] == -2.0
    window.close()


def test_the_display_baseline_is_on_for_every_sensor_by_default(make_window):
    """It used to be Finger-raw only; an idle box sensor drifts just as much."""
    window, stuck = _running_window(make_window)  # sensor_type="box"

    plots = window.force_plots
    assert plots._presentation_enabled is True, "a box sensor lost its baseline"
    assert plots.presentation.enabled is True
    # The per-unit floors came from the preferences, not from a sensor type.
    assert plots.presentation.min_deadband_for("raw") == 50.0
    assert plots.presentation.min_deadband_for("N") == 0.0
    _finish(window, stuck)