#include "render_3D/Point_Demo.h"

#include <gtest/gtest.h>

#include <algorithm>
#include <array>
#include <cstddef>
#include <cstdint>
#include <exception>
#include <memory>
#include <string>

namespace renderive::render_3d {
namespace {

struct Event_Point {
    float x{};
    float y{};
};

std::size_t colored_pixel_count(const Pixel_Frame& frame) {
    if (frame.rgba8.size() < 4)
        return 0;
    const auto* bytes = reinterpret_cast<const std::uint8_t*>(frame.rgba8.data());
    const std::array<std::uint8_t, 4> background{
        bytes[0], bytes[1], bytes[2], bytes[3]};
    std::size_t result{};
    for (std::size_t offset = 0; offset + 3 < frame.rgba8.size(); offset += 4) {
        result += bytes[offset] != background[0] ||
                  bytes[offset + 1] != background[1] ||
                  bytes[offset + 2] != background[2] ||
                  bytes[offset + 3] != background[3];
    }
    return result;
}

TEST(PointRenderIntegration, RendersRealRgbaAndResizes) {
    try {
        auto demo = make_point_demo(Scene_Options{.viewport = {320, 200}});
        ASSERT_TRUE(demo.scene->request_frame());
        auto first = demo.scene->latest_frame();
        ASSERT_NE(first, nullptr);
        EXPECT_EQ(first->extent, (Extent{320, 200}));
        EXPECT_EQ(first->rgba8.size(), 320U * 200U * 4U);
        EXPECT_GT(colored_pixel_count(*first), 100U);

        demo.scene->resize({480, 270});
        ASSERT_TRUE(demo.scene->request_frame());
        auto resized = demo.scene->latest_frame();
        ASSERT_NE(resized, nullptr);
        EXPECT_EQ(resized->extent, (Extent{480, 270}));
        EXPECT_EQ(resized->rgba8.size(), 480U * 270U * 4U);
        EXPECT_GT(colored_pixel_count(*resized), 100U);
    } catch (const std::exception& error) {
        GTEST_SKIP() << "Vulkan/Datoviz unavailable: " << error.what();
    }
}

TEST(PointRenderIntegration, KernelEventsReachDatovizArcballOnItsDomain) {
    try {
        auto demo = make_point_demo(Scene_Options{.viewport = {320, 200}});
        ASSERT_TRUE(demo.scene->request_frame());
        const auto before = demo.scene->latest_frame()->rgba8;

        ::renderive::Basic_Pointer_Event<Event_Point> press(
            ::renderive::Event_Type::Pointer_Press);
        press.position = {120.0F, 90.0F};
        press.button = ::renderive::Mouse_Button::Left;
        demo.scene->dispatch(press);
        ::renderive::Basic_Pointer_Event<Event_Point> move(
            ::renderive::Event_Type::Pointer_Move);
        move.position = {210.0F, 125.0F};
        move.buttons = 1;
        demo.scene->dispatch(move);
        move.position = {245.0F, 145.0F};
        demo.scene->dispatch(move);
        ::renderive::Basic_Pointer_Event<Event_Point> release(
            ::renderive::Event_Type::Pointer_Release);
        release.position = move.position;
        release.button = ::renderive::Mouse_Button::Left;
        demo.scene->dispatch(release);

        ASSERT_TRUE(demo.scene->request_frame());
        const auto after_drag = demo.scene->latest_frame();
        ASSERT_NE(after_drag, nullptr);
        EXPECT_NE(after_drag->rgba8, before);

        ::renderive::Basic_Wheel_Event<Event_Point> wheel;
        wheel.position = {160.0F, 100.0F};
        wheel.pixel_delta_y = 180.0;
        wheel.angle_delta_y = -216.0;
        demo.scene->dispatch(wheel);

        ASSERT_TRUE(demo.scene->request_frame());
        const auto after_wheel = demo.scene->latest_frame();
        ASSERT_NE(after_wheel, nullptr);
        EXPECT_GT(colored_pixel_count(*after_wheel), 100U);
        EXPECT_NE(after_wheel->rgba8, after_drag->rgba8);
    } catch (const std::exception& error) {
        GTEST_SKIP() << "Vulkan/Datoviz unavailable: " << error.what();
    }
}

} // namespace
} // namespace renderive::render_3d