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

from __future__ import annotations

import pytest

import ui_check
from tests.conftest import visible_descendants

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


def _show(window, size):
    window.resize(*size)
    window.show()
    from PyQt5.QtWidgets import QApplication

    QApplication.processEvents()
    return window


@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):
        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


def test_stop_cancels_a_hung_connect(make_window):
    """Stop must stay live and take effect instantly while 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"
    assert window.toolbar.btn_run.isEnabled(), "Stop is disabled while connecting"
    assert window.toolbar.btn_run.text() == t("toolbar.cancel_label")
    assert window.act_stop.isEnabled()

    started = time.perf_counter()
    window.toolbar.btn_run.setChecked(False)
    elapsed = time.perf_counter() - started
    assert elapsed < 0.5, f"Stop blocked the GUI for {elapsed:.2f}s"
    assert not window._running
    assert stuck.thread_still_owned, "Stop abandoned the still-running worker thread"


def test_escape_cancels_a_hung_connect(make_window):
    import time

    import ui_check

    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.act_stop.shortcut().toString() == "Esc"
    started = time.perf_counter()
    window._on_stop_shortcut()
    assert time.perf_counter() - started < 0.5
    assert not window._running


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()

    from orisys_app_shared.force.calibration_io import CalSample

    cal._store.upsert("fn", CalSample(weight_n=1.0, raw_mean=9.7, n=120, std=0.02))
    cal._refresh_table()
    assert cal.table.rowCount() == 1
    assert not cal.empty_hint.isVisible()


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 PyQt5.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 _running_window(make_window):
    """A window in the ``running`` phase whose worker never opens a device.

    The Qt timer is stopped deliberately: these tests drive the display path by
    calling ``_on_run_tick`` themselves, and a concurrent 16 ms timer would race
    the assertions (and outlive the window on teardown).
    """
    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()
    window._set_phase("running")
    return window, stuck


def _finish(window, stuck):
    window._stop_run(reason="user_stop")
    stuck.release()


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_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)