/****************************************************************************
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** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
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****************************************************************************/

#include "qandroidopenglplatformwindow.h"
#include "androidjnimain.h"
#include "qandroidplatformintegration.h"
#include <qpa/qwindowsysteminterface.h>

QT_BEGIN_NAMESPACE

EGLSurface QAndroidOpenGLPlatformWindow::m_staticSurface = 0;
EGLNativeWindowType QAndroidOpenGLPlatformWindow::m_staticNativeWindow = 0;
QReadWriteLock QAndroidOpenGLPlatformWindow::m_staticSurfaceLock;
QBasicAtomicInt QAndroidOpenGLPlatformWindow::m_referenceCount = Q_BASIC_ATOMIC_INITIALIZER(0);

QAndroidOpenGLPlatformWindow::QAndroidOpenGLPlatformWindow(QWindow *window)
    : QEglFSWindow(window)
    , m_state(Qt::WindowNoState)
{
}

QAndroidOpenGLPlatformWindow::~QAndroidOpenGLPlatformWindow()
{
    destroy();
}

bool QAndroidOpenGLPlatformWindow::isExposed() const
{
    return QtAndroid::nativeWindow(false) != 0 && QEglFSWindow::isExposed();
}

void QAndroidOpenGLPlatformWindow::invalidateSurface()
{
    QWindowSystemInterface::handleExposeEvent(window(), QRegion()); // Obscure event
    QWindowSystemInterface::flushWindowSystemEvents();

    m_window = 0;
    m_surface = 0;

    if (!m_referenceCount.deref()){
        QWriteLocker locker(&m_staticSurfaceLock);

        EGLDisplay display = (static_cast<QEglFSScreen *>(window()->screen()->handle()))->display();
        eglDestroySurface(display, m_staticSurface);

        m_staticSurface = 0;
        m_staticNativeWindow = 0;
    }
}

void QAndroidOpenGLPlatformWindow::updateStaticNativeWindow()
{
    QWriteLocker locker(&m_staticSurfaceLock);
    m_staticNativeWindow = QtAndroid::nativeWindow(false);
}

void QAndroidOpenGLPlatformWindow::resetSurface()
{
    // Only add a reference if we're not already holding one, otherwise we're just updating
    // the native window pointer
    if (m_window == 0)
        m_referenceCount.ref();

    if (m_staticSurface == 0) {
        QWriteLocker locker(&m_staticSurfaceLock);
        QEglFSWindow::resetSurface();
        m_staticSurface = m_surface;
        m_staticNativeWindow = m_window;
    } else {
        QReadLocker locker(&m_staticSurfaceLock);
        m_window = m_staticNativeWindow;
        m_surface = m_staticSurface;
    }

    {
        lock();
        // Use the desktop size.
        // On some devices, the getters for the native window size gives wrong values
        scheduleResize(QAndroidPlatformIntegration::defaultDesktopSize());
        QWindowSystemInterface::handleExposeEvent(window(), QRegion(geometry())); // Expose event
        unlock();
    }

    QWindowSystemInterface::flushWindowSystemEvents();
}

void QAndroidOpenGLPlatformWindow::destroy()
{
    if (!m_referenceCount.deref()) {
        QEglFSWindow::destroy();
    } else {
        m_window = 0;
        m_surface = 0;
    }
}

void QAndroidOpenGLPlatformWindow::updateStatusBarVisibility()
{
    Qt::WindowFlags flags = window()->flags();
    bool isNonRegularWindow = flags & (Qt::Popup | Qt::Dialog | Qt::Sheet) & ~Qt::Window;
    if (!isNonRegularWindow) {
        if (m_state & Qt::WindowFullScreen)
            QtAndroid::hideStatusBar();
        else if (m_state & Qt::WindowMaximized)
            QtAndroid::showStatusBar();
    }
}

void QAndroidOpenGLPlatformWindow::raise()
{
    updateStatusBarVisibility();
}

void QAndroidOpenGLPlatformWindow::setWindowState(Qt::WindowState state)
{
    if (m_state == state)
        return;

    m_state = state;
    if (window()->isVisible())
        updateStatusBarVisibility();
}

void QAndroidOpenGLPlatformWindow::setVisible(bool visible)
{
    if (visible)
        updateStatusBarVisibility();

    QEglFSWindow::setVisible(visible);

    // The Android Activity is activated before Qt is initialized, causing the application state to
    // never be set to 'active'. We explicitly set this state when the first window becomes visible.
    if (visible)
        QtAndroid::setApplicationActive();

    QWindowSystemInterface::handleExposeEvent(window(), QRegion(geometry())); // Expose event
    QWindowSystemInterface::flushWindowSystemEvents();
}

QT_END_NAMESPACE
