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#include "type_conversion.h"

#include <content/public/common/favicon_url.h>
#include <net/cert/x509_certificate.h>
#include <net/cert/x509_util.h>
#include <ui/events/event_constants.h>
#include <ui/gfx/image/image_skia.h>

#include <QtCore/qcoreapplication.h>
#include <QtGui/qmatrix4x4.h>
#include <QtNetwork/qsslcertificate.h>

namespace QtWebEngineCore {

QImage toQImage(const SkBitmap &bitmap)
{
    QImage image;
    switch (bitmap.colorType()) {
    case kUnknown_SkColorType:
    case kRGBA_F16_SkColorType:
    case kRGBA_F32_SkColorType:
    case kRGBA_F16Norm_SkColorType:
    case kR8G8_unorm_SkColorType:
    case kA16_float_SkColorType:
    case kA16_unorm_SkColorType:
    case kR16G16_float_SkColorType:
    case kR16G16_unorm_SkColorType:
        qWarning("Unknown or unsupported skia image format");
        break;
    case kAlpha_8_SkColorType:
        image = toQImage(bitmap, QImage::Format_Alpha8);
        break;
    case kRGB_565_SkColorType:
        image = toQImage(bitmap, QImage::Format_RGB16);
        break;
    case kARGB_4444_SkColorType:
        switch (bitmap.alphaType()) {
        case kUnknown_SkAlphaType:
            break;
        case kUnpremul_SkAlphaType:
            // not supported - treat as opaque
        case kOpaque_SkAlphaType:
            image = toQImage(bitmap, QImage::Format_RGB444);
            break;
        case kPremul_SkAlphaType:
            image = toQImage(bitmap, QImage::Format_ARGB4444_Premultiplied);
            break;
        }
        break;
    case kRGB_888x_SkColorType:
    case kRGBA_8888_SkColorType:
        switch (bitmap.alphaType()) {
        case kUnknown_SkAlphaType:
            break;
        case kOpaque_SkAlphaType:
            image = toQImage(bitmap, QImage::Format_RGBX8888);
            break;
        case kPremul_SkAlphaType:
            image = toQImage(bitmap, QImage::Format_RGBA8888_Premultiplied);
            break;
        case kUnpremul_SkAlphaType:
            image = toQImage(bitmap, QImage::Format_RGBA8888);
            break;
        }
        break;
    case kBGRA_8888_SkColorType:
        // we are assuming little-endian arch here.
        switch (bitmap.alphaType()) {
        case kUnknown_SkAlphaType:
            break;
        case kOpaque_SkAlphaType:
            image = toQImage(bitmap, QImage::Format_RGB32);
            break;
        case kPremul_SkAlphaType:
            image = toQImage(bitmap, QImage::Format_ARGB32_Premultiplied);
            break;
        case kUnpremul_SkAlphaType:
            image = toQImage(bitmap, QImage::Format_ARGB32);
            break;
        }
        break;
    case kRGB_101010x_SkColorType:
    case kRGBA_1010102_SkColorType:
        switch (bitmap.alphaType()) {
        case kUnknown_SkAlphaType:
            break;
        case kUnpremul_SkAlphaType:
            // not supported - treat as opaque
        case kOpaque_SkAlphaType:
            image = toQImage(bitmap, QImage::Format_RGB30);
            break;
        case kPremul_SkAlphaType:
            image = toQImage(bitmap, QImage::Format_A2RGB30_Premultiplied);
            break;
        }
        break;
    case kGray_8_SkColorType:
        image = toQImage(bitmap, QImage::Format_Grayscale8);
        break;
    case kR16G16B16A16_unorm_SkColorType:
        switch (bitmap.alphaType()) {
        case kUnknown_SkAlphaType:
            break;
        case kUnpremul_SkAlphaType:
            image = toQImage(bitmap, QImage::Format_RGBA64);
            break;
        case kOpaque_SkAlphaType:
            image = toQImage(bitmap, QImage::Format_RGBX64);
            break;
        case kPremul_SkAlphaType:
            image = toQImage(bitmap, QImage::Format_RGBA64_Premultiplied);
            break;
        }
        break;
    }
    return image;
}

QImage toQImage(const gfx::ImageSkiaRep &imageSkiaRep)
{
    QImage image = toQImage(imageSkiaRep.GetBitmap());
    if (!image.isNull() && imageSkiaRep.scale() != 1.0f)
        image.setDevicePixelRatio(imageSkiaRep.scale());
    return image;
}

SkBitmap toSkBitmap(const QImage &image)
{
    SkBitmap bitmap;
    SkImageInfo imageInfo;

    switch (image.format()) {
    case QImage::Format_RGB32:
        imageInfo = SkImageInfo::Make(image.width(), image.height(), kBGRA_8888_SkColorType, kOpaque_SkAlphaType);
        break;
    case QImage::Format_ARGB32:
        imageInfo = SkImageInfo::Make(image.width(), image.height(), kBGRA_8888_SkColorType, kUnpremul_SkAlphaType);
        break;
    case QImage::Format_ARGB32_Premultiplied:
        imageInfo = SkImageInfo::Make(image.width(), image.height(), kBGRA_8888_SkColorType, kPremul_SkAlphaType);
        break;
    case QImage::Format_RGBX8888:
        imageInfo = SkImageInfo::Make(image.width(), image.height(), kRGBA_8888_SkColorType, kOpaque_SkAlphaType);
        break;
    case QImage::Format_RGBA8888:
        imageInfo = SkImageInfo::Make(image.width(), image.height(), kRGBA_8888_SkColorType, kUnpremul_SkAlphaType);
        break;
    case QImage::Format_RGBA8888_Premultiplied:
        imageInfo = SkImageInfo::Make(image.width(), image.height(), kRGBA_8888_SkColorType, kPremul_SkAlphaType);
        break;
    default:
        return toSkBitmap(image.convertToFormat(QImage::Format_ARGB32_Premultiplied));
    }

    bitmap.installPixels(imageInfo, (void *)image.bits(), image.bytesPerLine());

    // Ensure we copy the pixels
    SkBitmap bitmapCopy;
    bitmapCopy.allocPixels(imageInfo);
    bitmapCopy.writePixels(bitmap.pixmap());

    return bitmapCopy;
}

QIcon toQIcon(const std::vector<SkBitmap> &bitmaps)
{
    if (!bitmaps.size())
        return QIcon();

    QIcon icon;

    for (unsigned i = 0; i < bitmaps.size(); ++i) {
        SkBitmap bitmap = bitmaps[i];
        QImage image = toQImage(bitmap);

        icon.addPixmap(QPixmap::fromImage(image).copy());
    }

    return icon;
}

int flagsFromModifiers(Qt::KeyboardModifiers modifiers)
{
    int modifierFlags = ui::EF_NONE;
#if defined(Q_OS_OSX)
    if (!qApp->testAttribute(Qt::AA_MacDontSwapCtrlAndMeta)) {
        if ((modifiers & Qt::ControlModifier) != 0)
            modifierFlags |= ui::EF_COMMAND_DOWN;
        if ((modifiers & Qt::MetaModifier) != 0)
            modifierFlags |= ui::EF_CONTROL_DOWN;
    } else
#endif
    {
        if ((modifiers & Qt::ControlModifier) != 0)
            modifierFlags |= ui::EF_CONTROL_DOWN;
        if ((modifiers & Qt::MetaModifier) != 0)
            modifierFlags |= ui::EF_COMMAND_DOWN;
    }
    if ((modifiers & Qt::ShiftModifier) != 0)
        modifierFlags |= ui::EF_SHIFT_DOWN;
    if ((modifiers & Qt::AltModifier) != 0)
        modifierFlags |= ui::EF_ALT_DOWN;
    return modifierFlags;
}

FaviconInfo::FaviconTypeFlags toQt(content::FaviconURL::IconType type)
{
    switch (type) {
    case content::FaviconURL::IconType::kFavicon:
        return FaviconInfo::Favicon;
    case content::FaviconURL::IconType::kTouchIcon:
        return FaviconInfo::TouchIcon;
    case content::FaviconURL::IconType::kTouchPrecomposedIcon:
        return FaviconInfo::TouchPrecomposedIcon;
    case content::FaviconURL::IconType::kInvalid:
        return FaviconInfo::InvalidIcon;
    }
    Q_UNREACHABLE();
    return FaviconInfo::InvalidIcon;
}

FaviconInfo toFaviconInfo(const content::FaviconURL &favicon_url)
{
    FaviconInfo info;
    info.url = toQt(favicon_url.icon_url);
    info.type = toQt(favicon_url.icon_type);
    // TODO: Add support for rel sizes attribute (favicon_url.icon_sizes):
    // http://www.w3schools.com/tags/att_link_sizes.asp
    info.size = QSize(0, 0);
    return info;
}

void convertToQt(const SkMatrix44 &m, QMatrix4x4 &c)
{
    QMatrix4x4 qtMatrix(
        m.get(0, 0), m.get(0, 1), m.get(0, 2), m.get(0, 3),
        m.get(1, 0), m.get(1, 1), m.get(1, 2), m.get(1, 3),
        m.get(2, 0), m.get(2, 1), m.get(2, 2), m.get(2, 3),
        m.get(3, 0), m.get(3, 1), m.get(3, 2), m.get(3, 3));
    qtMatrix.optimize();
    c = qtMatrix;
}

static QSslCertificate toCertificate(CRYPTO_BUFFER *buffer)
{
    auto derCert = net::x509_util::CryptoBufferAsStringPiece(buffer);
    return QSslCertificate(QByteArray::fromRawData(derCert.data(), derCert.size()), QSsl::Der);
}

QList<QSslCertificate> toCertificateChain(net::X509Certificate *certificate)
{
    // from leaf to root as in QtNetwork
    QList<QSslCertificate> chain;
    chain.append(toCertificate(certificate->cert_buffer()));
    for (auto &&buffer : certificate->intermediate_buffers())
        chain.append(toCertificate(buffer.get()));
    return chain;
}

} // namespace QtWebEngineCore