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#include "config.h"
#include "Helpers/GraphicsTestUtilities.h"

#include "Helpers/WebCoreTestUtilities.h"
#include <WebCore/GraphicsContext.h>
#include <WebCore/Image.h>
#include <WebCore/ImageBuffer.h>
#include <WebCore/NativeImage.h>
#include <WebCore/PixelBuffer.h>

namespace TestWebKitAPI {
using namespace WebCore;

static Color imageBufferPixelAt(const ImageBuffer& imageBuffer, FloatPoint point)
{
    PixelBufferFormat format { AlphaPremultiplication::Unpremultiplied, PixelFormat::RGBA8, ColorSpace::SRGB() };
    auto pixelBuffer = imageBuffer.getPixelBuffer(format, enclosingIntRect(FloatRect { point, FloatSize { 1, 1 } }));
    return Color { SRGBA<uint8_t> { pixelBuffer->item(0), pixelBuffer->item(1), pixelBuffer->item(2), pixelBuffer->item(3) } };
}

::testing::AssertionResult imageBufferPixelIs(Color expected, const ImageBuffer& imageBuffer, FloatPoint point, unsigned tolerance)
{
    auto got = imageBufferPixelAt(imageBuffer, point);
    auto [gotRed, gotGreen, gotBlue, gotAlpha] = got.toColorTypeLossy<SRGBA<uint8_t>>().resolved();
    auto [expectedRed, expectedGreen, expectedBlue, expectedAlpha] = expected.toColorTypeLossy<SRGBA<uint8_t>>().resolved();
    auto differs = [&](uint8_t a, uint8_t b) {
        return static_cast<unsigned>(a > b ? a - b : b - a) > tolerance;
    };
    if (differs(gotRed, expectedRed) || differs(gotGreen, expectedGreen) || differs(gotBlue, expectedBlue) || differs(gotAlpha, expectedAlpha)) {
        // Use this to debug the contents in the browser.
        // WTFLogAlways("%s", imageBuffer.toDataURL("image/png"_s).latin1().data());
        return ::testing::AssertionFailure() << "color is not expected at " << point << ". Got: " << got << ", expected: " << expected << " with tolerance " << tolerance << ".";
    }
    return ::testing::AssertionSuccess();
}

::testing::AssertionResult imagePixelIs(Color expected, Image& image, FloatPoint point, unsigned tolerance)
{
    RefPtr buffer = ImageBuffer::create({ 1, 1 }, RenderingMode::Unaccelerated, RenderingPurpose::Unspecified, 1.0f, ColorSpace::SRGB(),PixelFormat::BGRA8); // NOLINT
    if (!buffer)
        return ::testing::AssertionFailure() << "failed to allocate temp buffer";
    buffer->context().drawImage(image, { 0, 0, 1, 1 }, { point, FloatSize { 1, 1 } });
    return imageBufferPixelIs(expected, *buffer, { 0, 0 }, tolerance);
}

::testing::AssertionResult imagePixelIs(Color expected, NativeImage& image, FloatPoint point, unsigned tolerance)
{
    RefPtr buffer = ImageBuffer::create({ 1, 1 }, RenderingMode::Unaccelerated, RenderingPurpose::Unspecified, 1.0f, ColorSpace::SRGB(),PixelFormat::BGRA8); // NOLINT
    if (!buffer)
        return ::testing::AssertionFailure() << "failed to allocate temp buffer";
    buffer->context().drawNativeImage(image, { 0, 0, 1, 1 }, { point, FloatSize { 1, 1 } });
    return imageBufferPixelIs(expected, *buffer, { 0, 0 }, tolerance);
}


}