// How ImGuiWrapper turns wx mouse events into ImGui input. ImGuiWrapper lives in libslic3r_gui; this is
// the suite that links it. Same Windows include prologue as test_texture_color_palette.cpp (wx pulls in
// <windows.h>; keep WIN32_LEAN_AND_MEAN / NOMINMAX ahead of it).
#ifdef WIN32
    #ifndef WIN32_LEAN_AND_MEAN
        #define WIN32_LEAN_AND_MEAN
    #endif
    #ifndef NOMINMAX
        #define NOMINMAX
    #endif
    #include <Windows.h>
#endif

#include <catch2/catch_test_macros.hpp>
#include <catch2/generators/catch_generators.hpp>
#include <catch2/matchers/catch_matchers.hpp>
#include <catch2/matchers/catch_matchers_floating_point.hpp>

#include <imgui/imgui.h>
#include <wx/event.h>

#include "slic3r/GUI/ImGuiWrapper.hpp"

using Catch::Matchers::WithinAbs;
using Slic3r::GUI::ImGuiWrapper;

namespace {

// ImGui's wheel after one wheel event, as wx on macOS builds it: a delta of 10 and the rotation in whole
// points of trackpad travel.
float wheel_after(int rotation, wxMouseWheelAxis axis)
{
    ImGuiWrapper imgui;
    imgui.set_display_size(800.f, 600.f); // update_mouse_data() ignores input until the display has a size

    wxMouseEvent evt(wxEVT_MOUSEWHEEL);
    evt.m_wheelRotation = rotation;
    evt.m_wheelDelta    = 10;
    evt.m_wheelAxis     = axis;
    imgui.update_mouse_data(evt);
    return ImGui::GetIO().MouseWheel;
}

} // namespace

TEST_CASE("a vertical wheel event steps ImGui's wheel in its own direction", "[ImGuiWrapper]")
{
    const int rotation = GENERATE(1, 7, 120, -1, -7, -120);
    CHECK_THAT(wheel_after(rotation, wxMOUSE_WHEEL_VERTICAL), WithinAbs(rotation > 0 ? 1.0 : -1.0, 0.0));
}

// Both kinds arrive from a macOS trackpad while scrolling; see ImGuiWrapper::update_mouse_data().
TEST_CASE("a wheel event with no rotation or on the horizontal axis does not step ImGui's wheel", "[ImGuiWrapper][Regression]")
{
    const auto [rotation, axis] = GENERATE(table<int, wxMouseWheelAxis>({
        { 0, wxMOUSE_WHEEL_VERTICAL },
        { 5, wxMOUSE_WHEEL_HORIZONTAL },
        { -5, wxMOUSE_WHEEL_HORIZONTAL },
    }));
    CHECK_THAT(wheel_after(rotation, axis), WithinAbs(0.0, 0.0));
}