import pytest
from aarecommon.math.coordinate import Coordinate, SmargonCoordinate
from aarecommon.math.diffraction_geometry import DiffractionGeometry
from aarecommon.math.sample_geometry import SampleGeometryModel
from aarecommon.models.models import (
    BeamlineStateEnum,
    BeamlineStatus,
    CrystalSize,
    DAQStatusModel,
    SampleCameraSettings,
    SessionsStateEnum,
    SessionStatus,
)
from PySide6.QtCore import QEvent, QPoint, QPointF, Qt
from PySide6.QtGui import QMouseEvent

from aare.gui.scan_logic.raster_grid_manager import RasterGridManager
from aare.gui.styles import THEME_SUNRISE, THEME_SUNSET
from aare.gui.widgets.camera_image import SampleCameraImageLabel


def _geom() -> SampleGeometryModel:
    return SampleGeometryModel(
        beam_location_pxl=Coordinate(x=1000, y=1000),
        pixel_in_mm=0.001,
        aerotech=Coordinate(),
        aerotech_meas=Coordinate(),
        smargon=SmargonCoordinate(sh_mm=Coordinate(), phi_deg=0, chi_deg=0),
        omega_deg=0,
        beam_size_mm=Coordinate(x=0.01, y=0.01),
    )


def _status(
    *,
    busy: bool,
    session: SessionsStateEnum,
    state: BeamlineStateEnum = BeamlineStateEnum.SampleAlignment,
) -> DAQStatusModel:
    return DAQStatusModel(
        geom=_geom(),
        diffraction=DiffractionGeometry(
            energy_keV=12.4,
            dtz_mm=100.0,
            detector_size_pxl=(1553, 1630),
            pixel_size_mm=0.150,
            beam_center_pxl=(750.0, 750.0),
            detector_description="PILATUS 4",
            detector_serial_number="1",
            poni_rot1_rad=0.0,
            poni_rot2_rad=0.0,
        ),
        bl=BeamlineStatus(
            name="SIMULATED",
            ring_current_mA=400.0,
            front_light=50.0,
            back_light=50.0,
            cryojet_K=100.0,
            shutter_open=False,
            exp_shutter_open=False,
            flux_ph_s=1e12,
            sample_camera=SampleCameraSettings(gain=1.0, exposure=0.02),
            transmission=1.0,
            zoom=1.0,
            commissioning_mode=False,
            dtz_min=120.0,
            dtz_max=1600.0,
        ),
        state=state,
        busy=busy,
        session=SessionStatus(session=session, current_pgroup="p123", staff=True),
        crystal_size=CrystalSize(x=0, y=0, z=0),
    )


def _mouse_move(widget, pos: QPoint) -> None:
    # qtbot.mouseMove drives the real cursor, which the offscreen platform
    # ignores — deliver the move event directly instead.
    event = QMouseEvent(
        QEvent.Type.MouseMove,
        QPointF(pos),
        QPointF(widget.mapToGlobal(pos)),
        Qt.MouseButton.NoButton,
        Qt.MouseButton.NoButton,
        Qt.KeyboardModifier.NoModifier,
    )
    widget.mouseMoveEvent(event)


@pytest.fixture
def camera(qtbot):
    geom = _geom()
    label = SampleCameraImageLabel(geom=geom, raster=RasterGridManager(geom), default_image=None)
    qtbot.addWidget(label)
    label.resize(800, 600)
    return label


def test_help_badge_click_toggles_cheatsheet(camera, qtbot):
    camera.grab()  # paint records the collapsed "?" badge hit rect
    badge = camera._help_hit_rect
    assert badge is not None
    assert not camera._help_expanded

    qtbot.mouseClick(camera.viewport(), Qt.MouseButton.LeftButton, pos=badge.center().toPoint())
    assert camera._help_expanded

    camera.grab()  # expanded overlay: hit rect grows to the whole cheatsheet box
    box = camera._help_hit_rect
    assert box is not None
    assert box.height() > badge.height()

    qtbot.mouseClick(camera.viewport(), Qt.MouseButton.LeftButton, pos=box.center().toPoint())
    assert not camera._help_expanded


def test_help_overlay_folds_when_mouse_leaves_box(camera, qtbot):
    camera.grab()  # paint records the collapsed "?" badge hit rect
    badge = camera._help_hit_rect
    qtbot.mouseClick(camera.viewport(), Qt.MouseButton.LeftButton, pos=badge.center().toPoint())
    assert camera._help_expanded
    camera.grab()  # expanded paint records the full box rect
    box = camera._help_hit_rect

    _mouse_move(camera, box.center().toPoint())  # inside the box: stays open
    assert camera._help_expanded

    _mouse_move(camera, QPoint(int(box.left()) - 40, int(box.bottom()) + 40))
    assert not camera._help_expanded, "moving off the box must fold it back to the badge"

    # Leaving the widget entirely folds it too.
    camera.grab()
    badge = camera._help_hit_rect
    qtbot.mouseClick(camera.viewport(), Qt.MouseButton.LeftButton, pos=badge.center().toPoint())
    assert camera._help_expanded
    camera.leaveEvent(QEvent(QEvent.Type.Leave))
    assert not camera._help_expanded


def test_camera_error_message_rewords_and_draws(camera):
    camera.set_camera_available(False)
    camera.set_camera_error_message("Sample camera feed unavailable: cable unplugged")
    assert camera._camera_error_message == (
        "Sample camera feed unavailable because cable unplugged"
    )
    camera.grab()  # exercises the bottom-center unavailable overlay text path

    camera.set_camera_available(True)
    assert camera._camera_error_message is None


def test_busy_warning_is_not_a_click_target(camera):
    camera.update_daq_status(
        _status(
            busy=True, session=SessionsStateEnum.OwnedByYou, state=BeamlineStateEnum.DataCollection
        )
    )
    style = camera._busy_overlay_style
    assert style is not None
    assert style.text == "BEAMLINE BUSY"
    camera.grab()
    assert camera._session_badge_rect is None

    # Sample alignment is the exception: its busy moves ARE the alignment,
    # watched in this very view — no BEAMLINE BUSY curtain over it.
    camera.update_daq_status(
        _status(
            busy=True, session=SessionsStateEnum.OwnedByYou, state=BeamlineStateEnum.SampleAlignment
        )
    )
    assert camera._busy_overlay_style is None


def test_vacant_badge_hover_click_and_theme(camera, qtbot):
    camera.update_daq_status(_status(busy=False, session=SessionsStateEnum.Vacant))
    style = camera._busy_overlay_style
    assert style is not None
    assert style.subtext  # the grab-baton hint line

    camera.grab()  # paint records the badge rect
    badge = camera._session_badge_rect
    assert badge is not None

    _mouse_move(camera, badge.center())
    assert camera._session_badge_hovered
    camera.grab()  # hover fill, light-theme darken branch

    camera.set_theme(THEME_SUNSET)
    assert camera._dark_theme
    camera.grab()  # hover fill, sunset brighten branch
    camera.set_theme(THEME_SUNRISE)
    assert not camera._dark_theme

    _mouse_move(camera, QPoint(1, 1))
    assert not camera._session_badge_hovered

    _mouse_move(camera, badge.center())
    camera.leaveEvent(QEvent(QEvent.Type.Leave))
    assert not camera._session_badge_hovered

    with qtbot.waitSignal(camera.session_badge_clicked, timeout=1000):
        qtbot.mouseClick(camera.viewport(), Qt.MouseButton.LeftButton, pos=badge.center())


def test_help_more_link_opens_full_dialog(camera, qtbot):
    camera.grab()  # paint records the "?" badge hit rect
    badge = camera._help_hit_rect
    qtbot.mouseClick(camera.viewport(), Qt.MouseButton.LeftButton, pos=badge.center().toPoint())
    assert camera._help_expanded
    camera.grab()  # expanded overlay paint records the More... link rect
    more = camera._help_more_rect
    assert more is not None

    opened = []
    camera.open_full_help.connect(lambda: opened.append(True))
    qtbot.mouseClick(camera.viewport(), Qt.MouseButton.LeftButton, pos=more.center().toPoint())
    assert opened, "More... must open the full F1 dialog"
    assert not camera._help_expanded  # cheatsheet folds behind the dialog


def _wheel(widget, *, x=0, y=0, modifiers=Qt.KeyboardModifier.NoModifier):
    from PySide6.QtGui import QWheelEvent

    return QWheelEvent(
        QPointF(5, 5),
        QPointF(widget.mapToGlobal(QPoint(5, 5))),
        QPoint(0, 0),
        QPoint(x, y),
        Qt.MouseButton.NoButton,
        modifiers,
        Qt.ScrollPhase.NoScrollPhase,
        False,
    )


def test_alt_wheel_axis_swap_still_changes_exposure(camera):
    """xcb/windows swap wheel axes while Alt is held: the scroll lands in
    angleDelta().x(). The fallback must still reach the exposure branch —
    and a genuinely empty wheel event must do nothing."""
    camera.update_daq_status(_status(busy=False, session=SessionsStateEnum.OwnedByYou))
    sent = []
    camera.samcam_updated.connect(sent.append)

    camera.wheelEvent(_wheel(camera, x=-120, modifiers=Qt.KeyboardModifier.AltModifier))
    assert sent, "Alt+wheel with x-only delta must still adjust exposure"
    assert sent[0].exposure < 0.02, "negative delta must decrease exposure"

    camera.wheel_event_timer.stop()  # bypass the throttle for the second event
    n = len(sent)
    camera.wheelEvent(_wheel(camera))  # zero delta: ignored
    assert len(sent) == n


def test_hover_hud_coords_and_scale_bar(camera):
    # Hover inside the image: bottom-right HUD paints coords + grey scale bar.
    _mouse_move(camera, QPoint(400, 300))
    assert camera._hover_pos is not None
    camera.grab()

    # Hover outside the image (negative scene coords): HUD skips drawing.
    _mouse_move(camera, QPoint(-10, -10))
    camera.grab()

    # Leaving the view clears the readout entirely.
    camera.leaveEvent(QEvent(QEvent.Type.Leave))
    assert camera._hover_pos is None
    camera.grab()


def test_scale_bar_nice_numbers():
    # 1-2-5 progression against the ~120 px target, and the mm label swap.
    assert SampleCameraImageLabel._scale_bar(1.0) == (100.0, "100 µm")
    assert SampleCameraImageLabel._scale_bar(2.0) == (200.0, "200 µm")
    assert SampleCameraImageLabel._scale_bar(5.0) == (500.0, "500 µm")
    assert SampleCameraImageLabel._scale_bar(10.0) == (1000.0, "1 mm")


def test_autoscale_fits_from_the_first_frame(camera):
    from PySide6.QtGui import QPixmap

    # Fit-to-view is the default; a frame whose size differs from the fitted
    # one (here: the 2000x2000 startup placeholder) must refit immediately,
    # not wait for the next view resize.
    assert camera._autoscale
    camera.update_pixmap(QPixmap(4000, 4000))
    assert camera.transform().m11() < 1.0

    # The right-click toggle still restores 1:1.
    camera._autoscale = False
    camera._scaling()
    assert camera.transform().isIdentity()


def test_unknown_session_paints_the_viewing_mode_badge(camera):
    # No status yet: the busy overlay has nothing, the session overlay must
    # still hand out the same click target as the known not-owned states.
    assert camera._busy_overlay_style is None
    camera.grab()
    assert camera._session_badge_rect is not None