import math
import platform
from contextlib import suppress

import pytest
from qtpy.QtCore import QEvent, QPoint, QPointF, Qt
from qtpy.QtWidgets import QSlider, QStyle, QStyleOptionSlider

from superqt import QDoubleSlider, QLabeledDoubleSlider, QLabeledSlider
from superqt.sliders._generic_slider import _GenericSlider

from ._testutil import (
    QT_VERSION,
    _hover_event,
    _linspace,
    _mouse_event,
    _wheel_event,
    skip_on_linux_qt6,
)


@pytest.fixture(
    params=[Qt.Orientation.Horizontal, Qt.Orientation.Vertical],
    ids=["horizontal", "vertical"],
)
def orientation(request):
    return request.param


START_MI_MAX_VAL = (0, 99, 0)
TEST_SLIDERS = [QDoubleSlider, QLabeledSlider, QLabeledDoubleSlider]


def _assert_value_in_range(sld):
    val = sld.value()
    if isinstance(val, (int, float)):
        val = (val,)
    assert all(sld.minimum() <= v <= sld.maximum() for v in val)


@pytest.fixture(params=TEST_SLIDERS)
def sld(request, qtbot, orientation):
    Cls = request.param
    slider = Cls(orientation)
    slider.setRange(*START_MI_MAX_VAL[:2])
    slider.setValue(START_MI_MAX_VAL[2])
    qtbot.addWidget(slider)
    assert (slider.minimum(), slider.maximum(), slider.value()) == START_MI_MAX_VAL
    _assert_value_in_range(slider)
    yield slider
    _assert_value_in_range(slider)
    with suppress(AttributeError):
        slider.initStyleOption(QStyleOptionSlider())


def called_with(*expected_result):
    """Use in check_params_cbs to assert that a callback is called as expected.

    e.g. `called_with(20, 50)` returns a callback that checks that the callback
    is called with the arguments (20, 50)
    """

    def check_emitted_values(*values):
        return values == expected_result

    return check_emitted_values


def test_change_floatslider_range(sld: _GenericSlider, qtbot):
    BOTH = [sld.rangeChanged, sld.valueChanged]

    for signals, checks, funcname, args in [
        (BOTH, [called_with(10, 99), called_with(10)], "setMinimum", (10,)),
        ([sld.rangeChanged], [called_with(10, 90)], "setMaximum", (90,)),
        (BOTH, [called_with(20, 40), called_with(20)], "setRange", (20, 40)),
        ([sld.valueChanged], [called_with(30)], "setValue", (30,)),
        (BOTH, [called_with(20, 25), called_with(25)], "setMaximum", (25,)),
        ([sld.valueChanged], [called_with(23)], "setValue", (23,)),
    ]:
        with qtbot.waitSignals(signals, check_params_cbs=checks, timeout=500):
            getattr(sld, funcname)(*args)
        _assert_value_in_range(sld)


def test_float_values(sld: _GenericSlider, qtbot):
    if type(sld) is QLabeledSlider:
        pytest.skip()
    for signals, checks, funcname, args in [
        (sld.rangeChanged, called_with(0.1, 0.9), "setRange", (0.1, 0.9)),
        (sld.valueChanged, called_with(0.4), "setValue", (0.4,)),
        (sld.valueChanged, called_with(0.1), "setValue", (0,)),
        (sld.valueChanged, called_with(0.9), "setValue", (1.9,)),
    ]:
        with qtbot.waitSignal(signals, check_params_cb=checks, timeout=400):
            getattr(sld, funcname)(*args)
        _assert_value_in_range(sld)


def test_ticks(sld: _GenericSlider, qtbot):
    sld.setTickInterval(3)
    assert sld.tickInterval() == 3
    sld.setTickPosition(QSlider.TickPosition.TicksAbove)
    sld.show()


@pytest.mark.skipif(platform.system() != "Darwin", reason="cross-platform is tricky")
def test_press_move_release(sld: _GenericSlider, qtbot):
    if hasattr(sld, "_slider") and sld._slider.orientation() == Qt.Orientation.Vertical:
        pytest.xfail("test failing for vertical at the moment")
    # this fail on vertical came with pyside6.2 ... need to debug
    # still works in practice, but test fails to catch signals
    if sld.orientation() == Qt.Orientation.Vertical:
        pytest.xfail()

    _real_sld = getattr(sld, "_slider", sld)

    with suppress(AttributeError):  # for QSlider
        assert _real_sld._pressedControl == QStyle.SubControl.SC_None

    opt = QStyleOptionSlider()
    _real_sld.initStyleOption(opt)
    style = _real_sld.style()
    hrect = style.subControlRect(
        QStyle.ComplexControl.CC_Slider, opt, QStyle.SubControl.SC_SliderHandle
    )
    handle_pos = _real_sld.mapToGlobal(hrect.center())

    with qtbot.waitSignal(_real_sld.sliderPressed, timeout=300):
        qtbot.mousePress(_real_sld, Qt.MouseButton.LeftButton, pos=handle_pos)

    with suppress(AttributeError):
        assert sld._pressedControl == QStyle.SubControl.SC_SliderHandle

    with qtbot.waitSignals(
        [_real_sld.sliderMoved, _real_sld.valueChanged], timeout=300
    ):
        shift = (
            QPoint(0, -8)
            if _real_sld.orientation() == Qt.Orientation.Vertical
            else QPoint(8, 0)
        )
        _real_sld.mouseMoveEvent(_mouse_event(handle_pos + shift))

    with qtbot.waitSignal(_real_sld.sliderReleased, timeout=300):
        qtbot.mouseRelease(_real_sld, Qt.MouseButton.LeftButton, pos=handle_pos)

    with suppress(AttributeError):
        assert _real_sld._pressedControl == QStyle.SubControl.SC_None

    sld.show()
    with qtbot.waitSignal(_real_sld.sliderPressed, timeout=300):
        qtbot.mousePress(_real_sld, Qt.MouseButton.LeftButton, pos=handle_pos)


@skip_on_linux_qt6
def test_hover(sld: _GenericSlider):

    _real_sld = getattr(sld, "_slider", sld)

    opt = QStyleOptionSlider()
    _real_sld.initStyleOption(opt)
    hrect = _real_sld.style().subControlRect(
        QStyle.ComplexControl.CC_Slider, opt, QStyle.SubControl.SC_SliderHandle
    )
    handle_pos = QPointF(sld.mapToGlobal(hrect.center()))

    with suppress(AttributeError):  # for QSlider
        assert _real_sld._hoverControl == QStyle.SubControl.SC_None

    _real_sld.event(_hover_event(QEvent.Type.HoverEnter, handle_pos, QPointF(), sld))
    with suppress(AttributeError):  # for QSlider
        assert _real_sld._hoverControl == QStyle.SubControl.SC_SliderHandle

    _real_sld.event(
        _hover_event(QEvent.Type.HoverLeave, QPointF(-1000, -1000), handle_pos, sld)
    )
    with suppress(AttributeError):  # for QSlider
        assert _real_sld._hoverControl == QStyle.SubControl.SC_None


def test_wheel(sld: _GenericSlider, qtbot):

    if type(sld) is QLabeledSlider and QT_VERSION < (5, 12):
        pytest.skip()

    _real_sld = getattr(sld, "_slider", sld)
    with qtbot.waitSignal(sld.valueChanged, timeout=400):
        _real_sld.wheelEvent(_wheel_event(120))

    _real_sld.wheelEvent(_wheel_event(0))


def test_position(sld: _GenericSlider, qtbot):
    sld.setSliderPosition(21)
    assert sld.sliderPosition() == 21

    if type(sld) is not QLabeledSlider:
        sld.setSliderPosition(21.5)
        assert sld.sliderPosition() == 21.5


def test_steps(sld: _GenericSlider, qtbot):

    sld.setSingleStep(11)
    assert sld.singleStep() == 11

    sld.setPageStep(16)
    assert sld.pageStep() == 16

    if type(sld) is not QLabeledSlider:

        sld.setSingleStep(0.1)
        assert sld.singleStep() == 0.1

        sld.setSingleStep(1.5e20)
        assert sld.singleStep() == 1.5e20

        sld.setPageStep(0.2)
        assert sld.pageStep() == 0.2

        sld.setPageStep(1.5e30)
        assert sld.pageStep() == 1.5e30


@pytest.mark.parametrize("mag", list(range(4, 37, 4)) + list(range(-4, -37, -4)))
def test_slider_extremes(sld: _GenericSlider, mag, qtbot):
    if type(sld) is QLabeledSlider:
        pytest.skip()

    _mag = 10**mag
    with qtbot.waitSignal(sld.rangeChanged, timeout=400):
        sld.setRange(-_mag, _mag)
    for i in _linspace(-_mag, _mag, 10):
        sld.setValue(i)
        assert math.isclose(sld.value(), i, rel_tol=1e-8)