/********************************************************************
 KWin - the KDE window manager
 This file is part of the KDE project.

 Copyright (C) 2010 Thomas Lübking <thomas.luebking@web.de>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/

#include "windowgeometry.h"
#include <QStringBuilder>
#include <kwinconfig.h>
#include <kconfiggroup.h>
#include <kwindowsystem.h>
#include <KActionCollection>
#include <kaction.h>
#include <KDE/KLocale>

using namespace KWin;

KWIN_EFFECT(windowgeometry, WindowGeometry)

WindowGeometry::WindowGeometry()
{
    iAmActivated = true;
    iAmActive = false;
    myResizeWindow = 0L;
#define myResizeString "Window geometry display, %1 and %2 are the new size," \
                       " %3 and %4 are pixel increments - avoid reformatting or suffixes like 'px'", \
                       "Width: %1 (%3)\nHeight: %2 (%4)"
#define myCoordString_0 "Window geometry display, %1 and %2 are the cartesian x and y coordinates" \
                        " - avoid reformatting or suffixes like 'px'", \
                        "X: %1\nY: %2"
#define myCoordString_1 "Window geometry display, %1 and %2 are the cartesian x and y coordinates," \
                        " %3 and %4 are the resp. increments - avoid reformatting or suffixes like 'px'", \
                        "X: %1 (%3)\nY: %2 (%4)"
    reconfigure(ReconfigureAll);
    QFont fnt; fnt.setBold(true); fnt.setPointSize(12);
    for (int i = 0; i < 3; ++i) {
        myMeasure[i] = effects->effectFrame(EffectFrameUnstyled, false);
        myMeasure[i]->setFont(fnt);
    }
    myMeasure[0]->setAlignment(Qt::AlignLeft | Qt::AlignTop);
    myMeasure[1]->setAlignment(Qt::AlignCenter);
    myMeasure[2]->setAlignment(Qt::AlignRight | Qt::AlignBottom);

    KActionCollection* actionCollection = new KActionCollection(this);
    KAction* a = static_cast< KAction* >(actionCollection->addAction("WindowGeometry"));
    a->setText(i18n("Toggle window geometry display (effect only)"));
    a->setGlobalShortcut(KShortcut(Qt::CTRL + Qt::SHIFT + Qt::Key_F11));
    connect(a, SIGNAL(triggered(bool)), this, SLOT(toggle()));
    connect(effects, SIGNAL(windowStartUserMovedResized(KWin::EffectWindow*)), this, SLOT(slotWindowStartUserMovedResized(KWin::EffectWindow*)));
    connect(effects, SIGNAL(windowFinishUserMovedResized(KWin::EffectWindow*)), this, SLOT(slotWindowFinishUserMovedResized(KWin::EffectWindow*)));
    connect(effects, SIGNAL(windowStepUserMovedResized(KWin::EffectWindow*,QRect)), this, SLOT(slotWindowStepUserMovedResized(KWin::EffectWindow*,QRect)));
}

WindowGeometry::~WindowGeometry()
{
    for (int i = 0; i < 3; ++i)
        delete myMeasure[i];
}

void WindowGeometry::reconfigure(ReconfigureFlags)
{
    KConfigGroup conf = effects->effectConfig("WindowGeometry");
    iHandleMoves = conf.readEntry("Move", true);
    iHandleResizes = conf.readEntry("Resize", true);
}

void WindowGeometry::paintScreen(int mask, QRegion region, ScreenPaintData &data)
{
    effects->paintScreen(mask, region, data);
    if (iAmActivated && iAmActive) {
        for (int i = 0; i < 3; ++i)
            myMeasure[i]->render(infiniteRegion(), 1.0, .66);
    }
}

void WindowGeometry::toggle()
{
    iAmActivated = !iAmActivated;
}

void WindowGeometry::slotWindowStartUserMovedResized(EffectWindow *w)
{
    if (!iAmActivated)
        return;
    if (w->isUserResize() && !iHandleResizes)
        return;
    if (w->isUserMove() && !iHandleMoves)
        return;

    iAmActive = true;
    myResizeWindow = w;
    myOriginalGeometry = w->geometry();
    myCurrentGeometry = w->geometry();
    slotWindowStepUserMovedResized(w, w->geometry());
}

void WindowGeometry::slotWindowFinishUserMovedResized(EffectWindow *w)
{
    if (iAmActive && w == myResizeWindow) {
        iAmActive = false;
        myResizeWindow = 0L;
        effects->addRepaint(myCurrentGeometry.adjusted(-20, -20, 20, 20));
    }
}

static inline QString number(int n)
{
    QString sign;
    if (n >= 0) {
        sign = KGlobal::locale()->positiveSign();
        if (sign.isEmpty()) sign = '+';
    }
    else {
        n = -n;
        sign = KGlobal::locale()->negativeSign();
        if (sign.isEmpty()) sign = '-';
    }
    return  sign + QString::number(n);
}


void WindowGeometry::slotWindowStepUserMovedResized(EffectWindow *w, const QRect &geometry)
{
    if (iAmActivated && iAmActive && w == myResizeWindow) {
        myCurrentGeometry = geometry;
        const QRect &r = geometry;
        const QRect &r2 = myOriginalGeometry;

        // sufficient for moves, resizes calculated otherwise
        int dx = r.x() - r2.x();
        int dy = r.y() - r2.y();

        // upper left ----------------------
        if (w->isUserResize())
            myMeasure[0]->setText( i18nc(myCoordString_1, r.x(), r.y(), number(dx), number(dy) ) );
        else
            myMeasure[0]->setText( i18nc(myCoordString_0, r.x(), r.y() ) );
        myMeasure[0]->setPosition(geometry.topLeft());

        // center ----------------------
        if (w->isUserResize()) {
            // calc width for center element, otherwise the current dx/dx remains right
            dx = r.width() - r2.width();
            dy = r.height() - r2.height();

            const QSize baseInc = w->basicUnit();
            if (baseInc != QSize(1,1)) {
                Q_ASSERT(baseInc.width() && baseInc.height());
                const QSize csz = w->contentsRect().size();
                myMeasure[1]->setText( i18nc(myResizeString, csz.width()/baseInc.width(), csz.height()/baseInc.height(), number(dx/baseInc.width()), number(dy/baseInc.height()) ) );
            } else
                myMeasure[1]->setText( i18nc(myResizeString, r.width(), r.height(), number(dx), number(dy) ) );

            // calc width for bottomright element, superfluous otherwise
            dx = r.right() - r2.right();
            dy = r.bottom() - r2.bottom();
        } else
            myMeasure[1]->setText( i18nc(myCoordString_0, number(dx), number(dy) ) );

        myMeasure[1]->setPosition(geometry.center());

        // lower right ----------------------
        if (w->isUserResize())
            myMeasure[2]->setText( i18nc(myCoordString_1, r.right(), r.bottom(), number(dx), number(dy) ) );
        else
            myMeasure[2]->setText( i18nc(myCoordString_0, r.right(), r.bottom() ) );
        myMeasure[2]->setPosition(geometry.bottomRight());

        effects->addRepaint(geometry.adjusted(-20, -20, 20, 20));
    }
}

bool WindowGeometry::isActive() const
{
    return iAmActive;
}