#include <render_2D/base/Frame_2D.hpp>
#include <gtest/gtest.h>
namespace {
using namespace aethera;
using namespace aethera::render_2d;
void paint_translucent_red(Frame_2D& frame) {
    auto& target = aethera::render_2d::detail::Frame_2D_Access::render_target(&frame);
    aethera::render_2d::detail::Painter painter(target, Size{1, 1});
    painter.rect(Rect_F{0.0, 0.0, 1.0, 1.0},
                 Pen{Color::transparent(), 0.0, Line_Style::none},
                 Brush{Color{255, 0, 0, 128}, Brush_Style::solid});
}
}
TEST(frame_pixel_format, publishes_native_bgra_premultiplied_by_default) {
    Frame_2D frame{Frame_Identity{1, 0}};
    paint_translucent_red(frame);
    const auto pixels = frame.output_pixels();
    ASSERT_EQ(pixels.format, Pixel_Format::bgra8_premultiplied);
    ASSERT_EQ(pixels.bytes.size(), 4U);
    EXPECT_EQ(std::to_integer<unsigned>(pixels.bytes[0]), 0U);
    EXPECT_EQ(std::to_integer<unsigned>(pixels.bytes[1]), 0U);
    EXPECT_EQ(std::to_integer<unsigned>(pixels.bytes[2]), 128U);
    EXPECT_EQ(std::to_integer<unsigned>(pixels.bytes[3]), 128U);
}
TEST(frame_pixel_format, uses_blend2d_to_publish_straight_rgba) {
    Frame_2D frame{Frame_Identity{2, 0}, Pixel_Format::rgba8};
    paint_translucent_red(frame);
    const auto pixels = frame.output_pixels();
    ASSERT_EQ(pixels.format, Pixel_Format::rgba8);
    ASSERT_EQ(pixels.bytes.size(), 4U);
    EXPECT_GE(std::to_integer<unsigned>(pixels.bytes[0]), 254U);
    EXPECT_EQ(std::to_integer<unsigned>(pixels.bytes[1]), 0U);
    EXPECT_EQ(std::to_integer<unsigned>(pixels.bytes[2]), 0U);
    EXPECT_EQ(std::to_integer<unsigned>(pixels.bytes[3]), 128U);
}
TEST(framebuffer_view, writes_only_the_requested_external_image_region) {
    Blend2D_Cache framebuffer;
    framebuffer.ensure_size(Size{8, 6});
    {
        aethera::render_2d::detail::Painter painter(
            framebuffer, Size{8, 6}, Rect_F{2.0, 1.0, 3.0, 2.0});
        painter.rect(Rect_F{0.0, 0.0, 8.0, 6.0},
                     Pen{.style = Line_Style::none},
                     Brush{Color::red_color(), Brush_Style::solid});
    }
    const Image_View view = framebuffer.view();
    ASSERT_EQ(view.width, 8);
    ASSERT_EQ(view.height, 6);
    for (int y = 0; y < view.height; ++y) {
        const auto* row = reinterpret_cast<const Pixel*>(
            view.data + static_cast<std::ptrdiff_t>(y) * view.stride);
        for (int x = 0; x < view.width; ++x) {
            const bool inside = x >= 2 && x < 5 && y >= 1 && y < 3;
            EXPECT_EQ(row[x] != 0, inside) << "pixel " << x << ',' << y;
        }
    }
}
TEST(framebuffer_view, overlapping_views_share_the_same_authoritative_pixels) {
    Blend2D_Cache framebuffer;
    framebuffer.ensure_size(Size{8, 6});
    {
        aethera::render_2d::detail::Painter first(
            framebuffer, Size{8, 6}, Rect_F{1.0, 1.0, 4.0, 3.0});
        first.rect(Rect_F{0.0, 0.0, 8.0, 6.0},
                   Pen{.style = Line_Style::none},
                   Brush{Color::red_color(), Brush_Style::solid});
    }
    {
        aethera::render_2d::detail::Painter second(
            framebuffer, Size{8, 6}, Rect_F{3.0, 2.0, 4.0, 3.0});
        second.rect(Rect_F{0.0, 0.0, 8.0, 6.0},
                    Pen{.style = Line_Style::none},
                    Brush{Color{0, 0, 255, 255}, Brush_Style::solid});
    }
    const Image_View view = framebuffer.view();
    const auto pixel = [&](int x, int y) {
        const auto* row = reinterpret_cast<const Pixel*>(
            view.data + static_cast<std::ptrdiff_t>(y) * view.stride);
        return row[x];
    };
    EXPECT_NE(pixel(2, 2), 0u);
    EXPECT_NE(pixel(4, 3), 0u);
    EXPECT_NE(pixel(2, 2), pixel(4, 3));
}