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#include "qwsmanager_qws.h"

#ifndef QT_NO_QWS_MANAGER

#include "qdrawutil.h"

#include "qapplication.h"

#include "qstyle.h"

#include "qwidget.h"

#include "qmenu.h"

#include "qpainter.h"

#include "private/qpainter_p.h"

#include "qregion.h"

#include "qevent.h"

#include "qcursor.h"

#include "qwsdisplay_qws.h"

#include "qdesktopwidget.h"

#include <private/qapplication_p.h>

#include <private/qwidget_p.h>

#include <private/qbackingstore_p.h>

#include <private/qwindowsurface_qws_p.h>

#include "qdecorationfactory_qws.h"

#include "qlayout.h"

#include "qwsmanager_p.h"

#include <qdebug.h>

QT_BEGIN_NAMESPACE

QWidget *QWSManagerPrivate::active = 0;

QPoint QWSManagerPrivate::mousePos;

QWSManagerPrivate::QWSManagerPrivate()

    : QObjectPrivate(), activeRegion(QDecoration::None), managed(0), popup(0),

      previousRegionType(0), previousRegionRepainted(false), entireDecorationNeedsRepaint(false)

{

    cached_region.regionType = 0;

}

QRegion &QWSManager::cachedRegion()

{

    return d_func()->cached_region.region;

}

/*!

    \class QWSManager

    \ingroup qws

    \internal

*/

/*!

*/

QWSManager::QWSManager(QWidget *w)

    : QObject(*new QWSManagerPrivate, (QObject*)0)

{

    d_func()->managed = w;

}

QWSManager::~QWSManager()

{

    Q_D(QWSManager);

#ifndef QT_NO_MENU

    if (d->popup)

        delete d->popup;

#endif

    if (d->managed == QWSManagerPrivate::active)

        QWSManagerPrivate::active = 0;

}

QWidget *QWSManager::widget()

{

    Q_D(QWSManager);

    return d->managed;

}

QWidget *QWSManager::grabbedMouse()

{

    return QWSManagerPrivate::active;

}

QRegion QWSManager::region()

{

    Q_D(QWSManager);

    return QApplication::qwsDecoration().region(d->managed, d->managed->geometry());

}

bool QWSManager::event(QEvent *e)

{

    if (QObject::event(e))

        return true;

    switch (e->type()) {

        case QEvent::MouseMove:

            mouseMoveEvent((QMouseEvent*)e);

            break;

        case QEvent::MouseButtonPress:

            mousePressEvent((QMouseEvent*)e);

            break;

        case QEvent::MouseButtonRelease:

            mouseReleaseEvent((QMouseEvent*)e);

            break;

        case QEvent::MouseButtonDblClick:

            mouseDoubleClickEvent((QMouseEvent*)e);

            break;

        case QEvent::Paint:

            paintEvent((QPaintEvent*)e);

            break;

        default:

            return false;

            break;

    }

    return true;

}

void QWSManager::mousePressEvent(QMouseEvent *e)

{

    Q_D(QWSManager);

    d->mousePos = e->globalPos();

    d->activeRegion = QApplication::qwsDecoration().regionAt(d->managed, d->mousePos);

    if(d->cached_region.regionType)

        d->previousRegionRepainted |= repaintRegion(d->cached_region.regionType, QDecoration::Pressed);

    if (d->activeRegion == QDecoration::Menu) {

        QPoint pos = (QApplication::layoutDirection() == Qt::LeftToRight

                      ? d->managed->geometry().topLeft()

                      : d->managed->geometry().topRight());

        menu(pos);

    }

    if (d->activeRegion != QDecoration::None &&

         d->activeRegion != QDecoration::Menu) {

        d->active = d->managed;

        d->managed->grabMouse();

    }

    if (d->activeRegion != QDecoration::None &&

         d->activeRegion != QDecoration::Close &&

         d->activeRegion != QDecoration::Minimize &&

         d->activeRegion != QDecoration::Menu) {

        d->managed->raise();

    }

    if (e->button() == Qt::RightButton) {

        menu(e->globalPos());

    }

}

void QWSManager::mouseReleaseEvent(QMouseEvent *e)

{

    Q_D(QWSManager);

    d->managed->releaseMouse();

    if (d->cached_region.regionType && d->previousRegionRepainted && QApplication::mouseButtons() == 0) {

        bool doesHover = repaintRegion(d->cached_region.regionType, QDecoration::Hover);

        if (!doesHover) {

            repaintRegion(d->cached_region.regionType, QDecoration::Normal);

            d->previousRegionRepainted = false;

        }

    }

    if (e->button() == Qt::LeftButton) {

        //handleMove();

        int itm = QApplication::qwsDecoration().regionAt(d->managed, e->globalPos());

        int activatedItem = d->activeRegion;

        d->activeRegion = QDecoration::None;

        d->active = 0;

        if (activatedItem == itm)

            QApplication::qwsDecoration().regionClicked(d->managed, itm);

    } else if (d->activeRegion == QDecoration::None) {

        d->active = 0;

    }

}

void QWSManager::mouseDoubleClickEvent(QMouseEvent *e)

{

    Q_D(QWSManager);

    if (e->button() == Qt::LeftButton)

        QApplication::qwsDecoration().regionDoubleClicked(d->managed,

            QApplication::qwsDecoration().regionAt(d->managed, e->globalPos()));

}

static inline Qt::CursorShape regionToShape(int region)

{

    if (region == QDecoration::None)

        return Qt::ArrowCursor;

    static const struct {

        int region;

        Qt::CursorShape shape;

    } r2s[] = {

        { QDecoration::TopLeft,     Qt::SizeFDiagCursor },

        { QDecoration::Top,         Qt::SizeVerCursor},

        { QDecoration::TopRight,    Qt::SizeBDiagCursor},

        { QDecoration::Left,        Qt::SizeHorCursor},

        { QDecoration::Right,       Qt::SizeHorCursor},

        { QDecoration::BottomLeft,  Qt::SizeBDiagCursor},

        { QDecoration::Bottom,      Qt::SizeVerCursor},

        { QDecoration::BottomRight, Qt::SizeFDiagCursor},

        { QDecoration::None,        Qt::ArrowCursor}

    };

    int i = 0;

    while (region != r2s[i].region && r2s[i].region)

        ++i;

    return r2s[i].shape;

}

void QWSManager::mouseMoveEvent(QMouseEvent *e)

{

    Q_D(QWSManager);

    if (d->newCachedRegion(e->globalPos())) {

        if(d->previousRegionType && d->previousRegionRepainted)

            repaintRegion(d->previousRegionType, QDecoration::Normal);

        if(d->cached_region.regionType) {

            d->previousRegionRepainted = repaintRegion(d->cached_region.regionType, QDecoration::Hover);

        }

    }

#ifndef QT_NO_CURSOR

    QWSDisplay *qwsd = QApplication::desktop()->qwsDisplay();

    qwsd->selectCursor(d->managed, regionToShape(d->cachedRegionAt()));

#endif //QT_NO_CURSOR

    if (d->activeRegion)

        handleMove(e->globalPos());

}

void QWSManager::handleMove(QPoint g)

{

    Q_D(QWSManager);

    // don't allow dragging to where the user probably cannot click!

    QApplicationPrivate *ap = QApplicationPrivate::instance();

    const QRect maxWindowRect = ap->maxWindowRect(qt_screen);

    if (maxWindowRect.isValid()) {

        if (g.x() < maxWindowRect.x())

            g.setX(maxWindowRect.x());

        if (g.y() < maxWindowRect.y())

            g.setY(maxWindowRect.y());

        if (g.x() > maxWindowRect.right())

            g.setX(maxWindowRect.right());

        if (g.y() > maxWindowRect.bottom())

            g.setY(maxWindowRect.bottom());

    }

    if (g == d->mousePos)

        return;

    if ( d->managed->isMaximized() )

        return;

    int x = d->managed->geometry().x();

    int y = d->managed->geometry().y();

    int w = d->managed->width();

    int h = d->managed->height();

    QRect geom(d->managed->geometry());

    QPoint delta = g - d->mousePos;

    d->mousePos = g;

    if (d->activeRegion == QDecoration::Title) {

        geom = QRect(x + delta.x(), y + delta.y(), w, h);

    } else {

        bool keepTop = true;

        bool keepLeft = true;

        switch (d->activeRegion) {

        case QDecoration::Top:

            geom.setTop(geom.top() + delta.y());

            keepTop = false;

            break;

        case QDecoration::Bottom:

            geom.setBottom(geom.bottom() + delta.y());

            keepTop = true;

            break;

        case QDecoration::Left:

            geom.setLeft(geom.left() + delta.x());

            keepLeft = false;

            break;

        case QDecoration::Right:

            geom.setRight(geom.right() + delta.x());

            keepLeft = true;

            break;

        case QDecoration::TopRight:

            geom.setTopRight(geom.topRight() + delta);

            keepLeft = true;

            keepTop = false;

            break;

        case QDecoration::TopLeft:

            geom.setTopLeft(geom.topLeft() + delta);

            keepLeft = false;

            keepTop = false;

            break;

        case QDecoration::BottomLeft:

            geom.setBottomLeft(geom.bottomLeft() + delta);

            keepLeft = false;

            keepTop = true;

            break;

        case QDecoration::BottomRight:

            geom.setBottomRight(geom.bottomRight() + delta);

            keepLeft = true;

            keepTop = true;

            break;

        default:

            return;

        }

        QSize newSize = QLayout::closestAcceptableSize(d->managed, geom.size());

        int dx = newSize.width() - geom.width();

        int dy = newSize.height() - geom.height();

        if (keepTop) {

            geom.setBottom(geom.bottom() + dy);

            d->mousePos.ry() += dy;

        } else {

            geom.setTop(geom.top() - dy);

            d->mousePos.ry() -= dy;

        }

        if (keepLeft) {

            geom.setRight(geom.right() + dx);

            d->mousePos.rx() += dx;

        } else {

            geom.setLeft(geom.left() - dx);

            d->mousePos.rx() -= dx;

        }

    }

    if (geom != d->managed->geometry()) {

        QApplication::sendPostedEvents();

        d->managed->setGeometry(geom);

    }

}

void QWSManager::paintEvent(QPaintEvent *)

{

     Q_D(QWSManager);

     d->dirtyRegion(QDecoration::All, QDecoration::Normal);

}

void QWSManagerPrivate::dirtyRegion(int decorationRegion,

                                    QDecoration::DecorationState state,

                                    const QRegion &clip)

{

    QTLWExtra *topextra = managed->d_func()->extra->topextra;

    QWidgetBackingStore *bs = topextra->backingStore;

    const bool pendingUpdateRequest = bs->isDirty();

    if (decorationRegion == QDecoration::All) {

        if (clip.isEmpty())

            entireDecorationNeedsRepaint = true;

        dirtyRegions.clear();

        dirtyStates.clear();

    }

    int i = dirtyRegions.indexOf(decorationRegion);

    if (i >= 0) {

        dirtyRegions.removeAt(i);

        dirtyStates.removeAt(i);

    }

    dirtyRegions.append(decorationRegion);

    dirtyStates.append(state);

    if (!entireDecorationNeedsRepaint)

        dirtyClip += clip;

    if (!pendingUpdateRequest)

        QApplication::postEvent(managed, new QEvent(QEvent::UpdateRequest), Qt::LowEventPriority);

}

void QWSManagerPrivate::clearDirtyRegions()

{

    dirtyRegions.clear();

    dirtyStates.clear();

    dirtyClip = QRegion();

    entireDecorationNeedsRepaint = false;

}

bool QWSManager::repaintRegion(int decorationRegion, QDecoration::DecorationState state)

{

    Q_D(QWSManager);

    d->dirtyRegion(decorationRegion, state);

    return true;

}

void QWSManager::menu(const QPoint &pos)

{

#ifdef QT_NO_MENU

    Q_UNUSED(pos);

#else

    Q_D(QWSManager);

    if (d->popup)

        delete d->popup;

    // Basic window operation menu

    d->popup = new QMenu();

    QApplication::qwsDecoration().buildSysMenu(d->managed, d->popup);

    connect(d->popup, SIGNAL(triggered(QAction*)), SLOT(menuTriggered(QAction*)));

    d->popup->popup(pos);

    d->activeRegion = QDecoration::None;

#endif // QT_NO_MENU

}

void QWSManager::menuTriggered(QAction *action)

{

#ifdef QT_NO_MENU

    Q_UNUSED(action);

#else

    Q_D(QWSManager);

    QApplication::qwsDecoration().menuTriggered(d->managed, action);

    d->popup->deleteLater();

    d->popup = 0;

#endif

}

void QWSManager::startMove()

{

    Q_D(QWSManager);

    d->mousePos = QCursor::pos();

    d->activeRegion = QDecoration::Title;

    d->active = d->managed;

    d->managed->grabMouse();

}

void QWSManager::startResize()

{

    Q_D(QWSManager);

    d->activeRegion = QDecoration::BottomRight;

    d->active = d->managed;

    d->managed->grabMouse();

}

void QWSManager::maximize()

{

    Q_D(QWSManager);

    // find out how much space the decoration needs

    const int screen = QApplication::desktop()->screenNumber(d->managed);

    const QRect desk = QApplication::desktop()->availableGeometry(screen);

    QRect dummy(0, 0, 1, 1);

    QRect nr;

    QRegion r = QApplication::qwsDecoration().region(d->managed, dummy);

    if (r.isEmpty()) {

        nr = desk;

    } else {

        r += dummy; // make sure we get the full window region in case of 0 width borders

        QRect rect = r.boundingRect();

        nr = QRect(desk.x()-rect.x(), desk.y()-rect.y(),

                desk.width() - (rect.width()==1 ? 0 : rect.width()-1), // ==1 -> dummy

                desk.height() - (rect.height()==1 ? 0 : rect.height()-1));

    }

    d->managed->setGeometry(nr);

}

bool QWSManagerPrivate::newCachedRegion(const QPoint &pos)

{

    // Check if anything has changed that would affect the region caching

    if (managed->windowFlags() == cached_region.windowFlags

        && managed->geometry() == cached_region.windowGeometry

        && cached_region.region.contains(pos))

        return false;

    // Update the cached region

    int reg = QApplication::qwsDecoration().regionAt(managed, pos);

    if (QWidget::mouseGrabber())

        reg = QDecoration::None;

    previousRegionType = cached_region.regionType;

    cached_region.regionType = reg;

    cached_region.region = QApplication::qwsDecoration().region(managed, managed->geometry(),

                                                                reg);

    // Make room for borders around the widget, even if the decoration doesn't have a frame.

    if (reg && !(reg & int(QDecoration::Borders))) {

        cached_region.region -= QApplication::qwsDecoration().region(managed, managed->geometry(), QDecoration::Borders);

    }

    cached_region.windowFlags = managed->windowFlags();

    cached_region.windowGeometry = managed->geometry();

//    QRect rec = cached_region.region.boundingRect();

//    qDebug("Updated cached region: 0x%04x (%d, %d)  (%d, %d,  %d, %d)",