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

Copyright (C) 2009 Jorge Mata <matamax123@gmail.com>

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 "swiveltabs.h"
#include <cmath>

namespace KWin
{

KWIN_EFFECT(swiveltabs, SwivelTabsEffect)
KWIN_EFFECT_SUPPORTED(swiveltabs, SwivelTabsEffect::supported())

SwivelTabsEffect::SwivelTabsEffect()
{
    isActive = false;
    PI = 2.0 * acos(0.0);
    reconfigure(ReconfigureAll);
}

bool SwivelTabsEffect::supported()
{
    return effects->compositingType() == OpenGLCompositing;
}

void SwivelTabsEffect::reconfigure(ReconfigureFlags)
{
    KConfigGroup conf = EffectsHandler::effectConfig("SwivelTabs");
    vertical = conf.readEntry("SwivelVertical", true);
    horizontal = conf.readEntry("SwivelHorizontal", true);
    totalTime = conf.readEntry("SwivelDuration", 500);
}

void SwivelTabsEffect::prePaintScreen(ScreenPrePaintData& data, int time)
{
    if (isActive)
        data.mask |= Effect::PAINT_SCREEN_WITH_TRANSFORMED_WINDOWS;
    effects->prePaintScreen(data, time);
}

void SwivelTabsEffect::prePaintWindow(EffectWindow *w, WindowPrePaintData &data, int time)
{
    if (isActive && (w == windows.show || w == windows.hide)) {
        data.quads = data.quads.makeGrid(40);
        data.setTransformed();
        w->enablePainting(EffectWindow::PAINT_DISABLED);
        windows.time.addTime(time);
    }
    effects->prePaintWindow(w, data, time);
}

void SwivelTabsEffect::paintWindow(EffectWindow* w, int mask, QRegion region, WindowPaintData& data)
{
    if (isActive && (w == windows.show || w == windows.hide)) {
        for (int i = 0; i < data.quads.count(); ++i)
            transformQuad(data.quads[i]);
    }
    effects->paintWindow(w, mask, region, data);
}

void SwivelTabsEffect::postPaintWindow(EffectWindow* w)
{
    if (isActive && (w == windows.show || w == windows.hide))
        w->addRepaintFull();
    effects->postPaintWindow(w);
}

void SwivelTabsEffect::transformQuad(WindowQuad &quad)
{
    double F = windows.time.progress();
    int width = quad[1].x() - quad[0].x();
    int height = quad[3].y() - quad[0].y();
    int cx = quad[0].x() + (width / 2);
    int cy = quad[0].y() + (height / 2);
    if (lastF < 0.5 && F > 0.5) {
        effects->setElevatedWindow(windows.hide, false);
        effects->setElevatedWindow(windows.show, true);
    }
    lastF = F;
    if (F >= 1.0) {
        isActive = false;
        effects->setElevatedWindow(windows.hide, false);
        effects->setElevatedWindow(windows.show, false);
    }
    if (F < 0.5) {
        if (horizontal) {
            quad[0].setX(quad[0].x() + (width * F));
            quad[3].setX(quad[3].x() + (width * F));
            quad[1].setX(quad[1].x() - (width * F));
            quad[2].setX(quad[2].x() - (width * F));
        }
        if (vertical) {
            quad[0].setY(quad[0].y() + (height * F));
            quad[3].setY(quad[3].y() - (height * F));
            quad[1].setY(quad[1].y() + (height * F));
            quad[2].setY(quad[2].y() - (height * F));
        }
    } else {
        F -= 0.5;
        if (horizontal) {
            quad[0].setX(cx - (width * F));
            quad[3].setX(cx - (width * F));
            quad[1].setX(cx + (width * F));
            quad[2].setX(cx + (width * F));
        }
        if (vertical) {
            quad[0].setY(cy - (height * F));
            quad[3].setY(cy + (height * F));
            quad[1].setY(cy - (height * F));
            quad[2].setY(cy + (height * F));
        }
    }
}

void SwivelTabsEffect::clientGroupItemSwitched(EffectWindow* from, EffectWindow* to)
{
    if (isActive || from->isMinimized())
        return;
    windows.show = to;
    windows.hide = from;
    windows.time.setCurveShape(TimeLine::LinearCurve);
    windows.time.setDuration(animationTime(totalTime));
    windows.time.setProgress(0.0f);
    lastF = 0.0;
    isActive = true;
    effects->setElevatedWindow(to, false);
    effects->setElevatedWindow(from, true);
}

}