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#include "qqnxrootwindow.h"

#include "qqnxscreen.h"

#include <QtCore/QUuid>
#include <QtCore/QDebug>

#if defined(QQNXROOTWINDOW_DEBUG)
#define qRootWindowDebug qDebug
#else
#define qRootWindowDebug QT_NO_QDEBUG_MACRO
#endif

#include <errno.h>
#include <unistd.h>

static const int MAGIC_ZORDER_FOR_NO_NAV = 10;

QQnxRootWindow::QQnxRootWindow(const QQnxScreen *screen)
    : m_screen(screen),
      m_window(0),
      m_windowGroupName(),
      m_translucent(false)
{
    qRootWindowDebug() << Q_FUNC_INFO;
    // Create one top-level QNX window to act as a container for child windows
    // since navigator only supports one application window
    errno = 0;
    int result = screen_create_window(&m_window, m_screen->nativeContext());
    int val[2];
    if (result != 0)
        qFatal("QQnxRootWindow: failed to create window, errno=%d", errno);

    // Move window to proper display
    errno = 0;
    screen_display_t display = m_screen->nativeDisplay();
    result = screen_set_window_property_pv(m_window, SCREEN_PROPERTY_DISPLAY, (void **)&display);
    if (result != 0)
        qFatal("QQnxRootWindow: failed to set window display, errno=%d", errno);

    // Make sure window is above navigator but below keyboard if running as root
    // since navigator won't automatically set our z-order in this case
    if (getuid() == 0) {
        errno = 0;
        val[0] = MAGIC_ZORDER_FOR_NO_NAV;
        result = screen_set_window_property_iv(m_window, SCREEN_PROPERTY_ZORDER, val);
        if (result != 0)
            qFatal("QQnxRootWindow: failed to set window z-order, errno=%d", errno);
    }

    // Window won't be visible unless it has some buffers so make one dummy buffer that is 1x1
    errno = 0;
    val[0] = SCREEN_USAGE_NATIVE;
    result = screen_set_window_property_iv(m_window, SCREEN_PROPERTY_USAGE, val);
    if (result != 0)
        qFatal("QQnxRootWindow: failed to set window buffer usage, errno=%d", errno);

    errno = 0;
    val[0] = m_screen->nativeFormat();
    result = screen_set_window_property_iv(m_window, SCREEN_PROPERTY_FORMAT, val);
    if (result != 0)
        qFatal("QQnxRootWindow: failed to set window pixel format, errno=%d", errno);

    errno = 0;
    val[0] = 1;
    val[1] = 1;
    result = screen_set_window_property_iv(m_window, SCREEN_PROPERTY_BUFFER_SIZE, val);
    if (result != 0)
        qFatal("QQnxRootWindow: failed to set window buffer size, errno=%d", errno);

    errno = 0;
    result = screen_create_window_buffers(m_window, 1);
    if (result != 0)
        qFatal("QQNX: failed to create window buffer, errno=%d", errno);

    // Window is always the size of the display
    errno = 0;
    QRect geometry = m_screen->geometry();
    val[0] = geometry.width();
    val[1] = geometry.height();
    result = screen_set_window_property_iv(m_window, SCREEN_PROPERTY_SIZE, val);
    if (result != 0)
        qFatal("QQnxRootWindow: failed to set window size, errno=%d", errno);

    // Fill the window with solid black. Note that the LSB of the pixel value
    // 0x00000000 just happens to be 0x00, so if and when this root window's
    // alpha blending mode is changed from None to Source-Over, it will then
    // be interpreted as transparent.
    errno = 0;
    val[0] = 0;
    result = screen_set_window_property_iv(m_window, SCREEN_PROPERTY_COLOR, val);
    if (result != 0)
        qFatal("QQnxRootWindow: failed to set window colour, errno=%d", errno);

    // Make the window opaque
    errno = 0;
    val[0] = SCREEN_TRANSPARENCY_NONE;
    result = screen_set_window_property_iv(m_window, SCREEN_PROPERTY_TRANSPARENCY, val);
    if (result != 0)
        qFatal("QQnxRootWindow: failed to set window transparency, errno=%d", errno);

    // Set the swap interval to 1
    errno = 0;
    val[0] = 1;
    result = screen_set_window_property_iv(m_window, SCREEN_PROPERTY_SWAP_INTERVAL, val);
    if (result != 0)
        qFatal("QQnxRootWindow: failed to set window swap interval, errno=%d", errno);

    // Set viewport size equal to window size but move outside buffer so the fill colour is used exclusively
    errno = 0;
    val[0] = geometry.width();
    val[1] = geometry.height();
    result = screen_set_window_property_iv(m_window, SCREEN_PROPERTY_SOURCE_SIZE, val);
    if (result != 0)
        qFatal("QQnxRootWindow: failed to set window source size, errno=%d", errno);

    errno = 0;
    val[0] = 0;
    val[1] = 0;
    result = screen_set_window_property_iv(m_window, SCREEN_PROPERTY_SOURCE_POSITION, val);
    if (result != 0)
        qFatal("QQnxRootWindow: failed to set window source position, errno=%d", errno);

    // Optionally disable the screen power save
    bool ok = false;
    const int disablePowerSave = qgetenv("QQNX_DISABLE_POWER_SAVE").toInt(&ok);
    if (ok && disablePowerSave) {
        const int mode = SCREEN_IDLE_MODE_KEEP_AWAKE;
        result = screen_set_window_property_iv(m_window, SCREEN_PROPERTY_IDLE_MODE, &mode);
        if (result != 0)
            qWarning("QQnxRootWindow: failed to disable power saving mode");
    }

    createWindowGroup();

    // Don't post yet. This will be lazily done from QQnxScreen upon first posting of
    // a child window. Doing it now pre-emptively would create a flicker if one of
    // the QWindow's about to be created sets its Qt::WA_TranslucentBackground flag
    // and immediately triggers the buffer re-creation in makeTranslucent().
}

void QQnxRootWindow::makeTranslucent()
{
    if (m_translucent)
        return;

    int result;

    errno = 0;
    result = screen_destroy_window_buffers(m_window);
    if (result != 0) {
        qFatal("QQnxRootWindow: failed to destroy window buffer, errno=%d", errno);
    }

    QRect geometry = m_screen->geometry();
    errno = 0;
    int val[2];
    val[0] = geometry.width();
    val[1] = geometry.height();
    result = screen_set_window_property_iv(m_window, SCREEN_PROPERTY_BUFFER_SIZE, val);
    if (result != 0) {
        qFatal("QQnxRootWindow: failed to set window buffer size, errno=%d", errno);
    }

    errno = 0;
    result = screen_create_window_buffers(m_window, 1);
    if (result != 0) {
        qFatal("QQNX: failed to create window buffer, errno=%d", errno);
    }

    // Install an alpha channel on the root window.
    //
    // This is necessary in order to avoid interfering with any particular
    // toplevel widget's QQnxWindow window instance from showing transparent
    // if it desires.
    errno = 0;
    val[0] = SCREEN_TRANSPARENCY_SOURCE_OVER;
    result = screen_set_window_property_iv(m_window, SCREEN_PROPERTY_TRANSPARENCY, val);
    if (result != 0) {
        qFatal("QQnxRootWindow: failed to set window transparency, errno=%d", errno);
    }

    m_translucent = true;
    post();
}

QQnxRootWindow::~QQnxRootWindow()
{
    // Cleanup top-level QNX window
    screen_destroy_window(m_window);
}

void QQnxRootWindow::post() const
{
    qRootWindowDebug() << Q_FUNC_INFO;
    errno = 0;
    screen_buffer_t buffer;
    int result = screen_get_window_property_pv(m_window, SCREEN_PROPERTY_RENDER_BUFFERS, (void **)&buffer);
    if (result != 0)
        qFatal("QQnxRootWindow: failed to query window buffer, errno=%d", errno);

    errno = 0;
    int dirtyRect[] = {0, 0, 1, 1};
    result = screen_post_window(m_window, buffer, 1, dirtyRect, 0);
    if (result != 0)
        qFatal("QQNX: failed to post window buffer, errno=%d", errno);
}

void QQnxRootWindow::flush() const
{
    qRootWindowDebug() << Q_FUNC_INFO;
    // Force immediate display update
    errno = 0;
    int result = screen_flush_context(m_screen->nativeContext(), 0);
    if (result != 0)
        qFatal("QQnxRootWindow: failed to flush context, errno=%d", errno);
}

void QQnxRootWindow::setRotation(int rotation)
{
    qRootWindowDebug() << Q_FUNC_INFO << "angle =" << rotation;
    errno = 0;
    int result = screen_set_window_property_iv(m_window, SCREEN_PROPERTY_ROTATION, &rotation);
    if (result != 0)
        qFatal("QQnxRootWindow: failed to set window rotation, errno=%d", errno);
}

void QQnxRootWindow::resize(const QSize &size)
{
    errno = 0;
    int val[] = {size.width(), size.height()};
    int result = screen_set_window_property_iv(m_window, SCREEN_PROPERTY_SIZE, val);
    if (result != 0)
        qFatal("QQnxRootWindow: failed to set window size, errno=%d", errno);

    errno = 0;
    result = screen_set_window_property_iv(m_window, SCREEN_PROPERTY_SOURCE_SIZE, val);
    if (result != 0)
        qFatal("QQnxRootWindow: failed to set window source size, errno=%d", errno);

    // NOTE: display will update when child windows relayout and repaint
}

void QQnxRootWindow::createWindowGroup()
{
    // Generate a random window group name
    m_windowGroupName = QUuid::createUuid().toString().toLatin1();

    // Create window group so child windows can be parented by container window
    errno = 0;
    int result = screen_create_window_group(m_window, m_windowGroupName.constData());
    if (result != 0)
        qFatal("QQnxRootWindow: failed to create app window group, errno=%d", errno);
}