/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
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** file. Please review the following information to ensure the GNU General
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****************************************************************************/

#include "qwindowsintegration.h"
#include "qwindowsbackingstore.h"
#include "qwindowswindow.h"
#include "qwindowscontext.h"
#include "qwindowsglcontext.h"
#include "qwindowsscreen.h"
#include "qwindowstheme.h"
#ifndef QT_NO_FREETYPE
#include "qwindowsfontdatabase_ft.h"
#endif
#include "qwindowsfontdatabase.h"
#include "qwindowsguieventdispatcher.h"
#include "qwindowsclipboard.h"
#include "qwindowsdrag.h"
#include "qwindowsinputcontext.h"
#include "qwindowsaccessibility.h"

#include <QtGui/QPlatformNativeInterface>
#include <QtGui/QWindowSystemInterface>
#include <QtGui/QBackingStore>
#include <QtGui/private/qpixmap_raster_p.h>
#include <QtGui/private/qguiapplication_p.h>

#include <QtCore/private/qeventdispatcher_win_p.h>
#include <QtCore/QDebug>

QT_BEGIN_NAMESPACE

/*!
    \class QWindowsNativeInterface
    \brief Provides access to native handles.

    Currently implemented keys
    \list
    \o handle (HWND)
    \o getDC (DC)
    \o releaseDC Releases the previously acquired DC and returns 0.
    \endlist

    \ingroup qt-lighthouse-win
*/

class QWindowsNativeInterface : public QPlatformNativeInterface
{
public:
    virtual void *nativeResourceForContext(const QByteArray &resource, QOpenGLContext *context);
    virtual void *nativeResourceForWindow(const QByteArray &resource, QWindow *window);
    virtual void *nativeResourceForBackingStore(const QByteArray &resource, QBackingStore *bs);
};

void *QWindowsNativeInterface::nativeResourceForWindow(const QByteArray &resource, QWindow *window)
{
    if (!window || !window->handle()) {
        qWarning("%s: '%s' requested for null window or window without handle.", __FUNCTION__, resource.constData());
        return 0;
    }
    QWindowsWindow *bw = static_cast<QWindowsWindow *>(window->handle());
    if (resource == "handle")
        return bw->handle();
    if (window->surfaceType() == QWindow::RasterSurface) {
        if (resource == "getDC")
            return bw->getDC();
        if (resource == "releaseDC") {
            bw->releaseDC();
            return 0;
        }
    }
    qWarning("%s: Invalid key '%s' requested.", __FUNCTION__, resource.constData());
    return 0;
}

void *QWindowsNativeInterface::nativeResourceForBackingStore(const QByteArray &resource, QBackingStore *bs)
{
    if (!bs || !bs->handle()) {
        qWarning("%s: '%s' requested for null backingstore or backingstore without handle.", __FUNCTION__, resource.constData());
        return 0;
    }
    QWindowsBackingStore *wbs = static_cast<QWindowsBackingStore *>(bs->handle());
    if (resource == "getDC")
        return wbs->getDC();
    qWarning("%s: Invalid key '%s' requested.", __FUNCTION__, resource.constData());
    return 0;
}

void *QWindowsNativeInterface::nativeResourceForContext(const QByteArray &resource, QOpenGLContext *context)
{
    if (!context || !context->handle()) {
        qWarning("%s: '%s' requested for null context or context without handle.", __FUNCTION__, resource.constData());
        return 0;
    }
    QWindowsGLContext *windowsContext = static_cast<QWindowsGLContext *>(context->handle());
    if (resource == "renderingContext")
        return windowsContext->renderingContext();

    qWarning("%s: Invalid key '%s' requested.", __FUNCTION__, resource.constData());
    return 0;
}

/*!
    \class QWindowsIntegration
    \brief QPlatformIntegration implementation for Windows.
    \ingroup qt-lighthouse-win
*/

struct QWindowsIntegrationPrivate
{
    typedef QSharedPointer<QOpenGLStaticContext> QOpenGLStaticContextPtr;

    QWindowsIntegrationPrivate();
    ~QWindowsIntegrationPrivate();

    QWindowsContext m_context;
    QPlatformFontDatabase *m_fontDatabase;
    QWindowsNativeInterface m_nativeInterface;
    QWindowsClipboard m_clipboard;
    QWindowsDrag m_drag;
    QWindowsGuiEventDispatcher *m_eventDispatcher;
    QOpenGLStaticContextPtr m_staticOpenGLContext;
    QWindowsInputContext m_inputContext;
    QWindowsAccessibility m_accessibility;
    QWindowsTheme m_theme;
};

QWindowsIntegrationPrivate::QWindowsIntegrationPrivate()
    : m_fontDatabase(0), m_eventDispatcher(new QWindowsGuiEventDispatcher)
{
}

QWindowsIntegrationPrivate::~QWindowsIntegrationPrivate()
{
    if (m_fontDatabase)
        delete m_fontDatabase;
}

QWindowsIntegration::QWindowsIntegration() :
    d(new QWindowsIntegrationPrivate)
{
    QGuiApplicationPrivate::instance()->setEventDispatcher(d->m_eventDispatcher);
    d->m_clipboard.registerViewer();
    foreach (QPlatformScreen *pscr, QWindowsScreen::screens())
        screenAdded(pscr);
}

QWindowsIntegration::~QWindowsIntegration()
{
    if (QWindowsContext::verboseIntegration)
        qDebug("%s", __FUNCTION__);
}

bool QWindowsIntegration::hasCapability(QPlatformIntegration::Capability cap) const
{
    switch (cap) {
    case ThreadedPixmaps:
        return true;
    case OpenGL:
        return true;
    case ThreadedOpenGL:
        return true;
    default:
        return QPlatformIntegration::hasCapability(cap);
    }
    return false;
}

QPlatformPixmap *QWindowsIntegration::createPlatformPixmap(QPlatformPixmap::PixelType type) const
{
    if (QWindowsContext::verboseIntegration)
        qDebug() << __FUNCTION__ << type;
    return new QRasterPlatformPixmap(type);
}

QPlatformWindow *QWindowsIntegration::createPlatformWindow(QWindow *window) const
{
    QWindowsWindow::WindowData requested;
    requested.flags = window->windowFlags();
    requested.geometry = window->geometry();
    const QWindowsWindow::WindowData obtained
            = QWindowsWindow::WindowData::create(window, requested, window->windowTitle());
    if (QWindowsContext::verboseIntegration || QWindowsContext::verboseWindows)
        qDebug().nospace()
            << __FUNCTION__ << ' ' << window << '\n'
            << "    Requested: " << requested.geometry << " Flags="
            << QWindowsWindow::debugWindowFlags(requested.flags) << '\n'
            << "    Obtained : " << obtained.geometry << " Margins "
            << obtained.frame  << " Flags="
            << QWindowsWindow::debugWindowFlags(obtained.flags)
            << " Handle=" << obtained.hwnd << '\n';
    if (!obtained.hwnd)
        return 0;
    if (requested.flags != obtained.flags)
        window->setWindowFlags(obtained.flags);
    if (requested.geometry != obtained.geometry)
        QWindowSystemInterface::handleGeometryChange(window, obtained.geometry);
    return new QWindowsWindow(window, obtained);
}

QPlatformBackingStore *QWindowsIntegration::createPlatformBackingStore(QWindow *window) const
{
    if (QWindowsContext::verboseIntegration)
        qDebug() << __FUNCTION__ << window;
    return new QWindowsBackingStore(window);
}

QPlatformOpenGLContext
    *QWindowsIntegration::createPlatformOpenGLContext(QOpenGLContext *context) const
{
    if (QWindowsContext::verboseIntegration)
        qDebug() << __FUNCTION__ << context->format();
    if (d->m_staticOpenGLContext.isNull())
        d->m_staticOpenGLContext =
            QSharedPointer<QOpenGLStaticContext>(QOpenGLStaticContext::create());
    QScopedPointer<QWindowsGLContext> result(new QWindowsGLContext(d->m_staticOpenGLContext, context));
    if (result->isValid())
        return result.take();
    return 0;
}

QPlatformFontDatabase *QWindowsIntegration::fontDatabase() const
{
    if (!d->m_fontDatabase) {
#ifndef QT_NO_FREETYPE
        if (d->m_nativeInterface.property("fontengine").toString() == QLatin1String("native"))
            d->m_fontDatabase = new QWindowsFontDatabase();
        else
            d->m_fontDatabase = new QWindowsFontDatabaseFT();
#else
        d->m_fontDatabase = new QWindowsFontDatabase();
#endif
    }
    return d->m_fontDatabase;
}

QVariant QWindowsIntegration::styleHint(QPlatformIntegration::StyleHint hint) const
{
    switch (hint) {
    case QPlatformIntegration::CursorFlashTime:
        if (const unsigned timeMS = GetCaretBlinkTime())
            return QVariant(int(timeMS));
        break;

    case QPlatformIntegration::StartDragTime:
    case QPlatformIntegration::StartDragDistance:
    case QPlatformIntegration::MouseDoubleClickInterval:
    case QPlatformIntegration::KeyboardInputInterval:
        break; // Not implemented
    }
    return QPlatformIntegration::styleHint(hint);
}

QPlatformNativeInterface *QWindowsIntegration::nativeInterface() const
{
    return &d->m_nativeInterface;
}

QPlatformClipboard * QWindowsIntegration::clipboard() const
{
    return &d->m_clipboard;
}

QPlatformDrag *QWindowsIntegration::drag() const
{
    return &d->m_drag;
}

QPlatformInputContext * QWindowsIntegration::inputContext() const
{
    return &d->m_inputContext;
}

QPlatformAccessibility *QWindowsIntegration::accessibility() const
{
    return &d->m_accessibility;
}

QWindowsIntegration *QWindowsIntegration::instance()
{
    return static_cast<QWindowsIntegration *>(QGuiApplicationPrivate::platformIntegration());
}

QAbstractEventDispatcher * QWindowsIntegration::guiThreadEventDispatcher() const
{
    return d->m_eventDispatcher;
}

QPlatformTheme *QWindowsIntegration::platformTheme() const
{
    return &d->m_theme;
}

QT_END_NAMESPACE