/***************************************************************************
 *   Copyright (c) 2016 WandererFan <wandererfan@gmail.com>                *
 *                                                                         *
 *   This file is part of the FreeCAD CAx development system.              *
 *                                                                         *
 *   This library is free software; you can redistribute it and/or         *
 *   modify it under the terms of the GNU Library General Public           *
 *   License as published by the Free Software Foundation; either          *
 *   version 2 of the License, or (at your option) any later version.      *
 *                                                                         *
 *   This library  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 Library General Public License for more details.                  *
 *                                                                         *
 *   You should have received a copy of the GNU Library General Public     *
 *   License along with this library; see the file COPYING.LIB. If not,    *
 *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
 *   Suite 330, Boston, MA  02111-1307, USA                                *
 *                                                                         *
 ***************************************************************************/

#include "PreCompiled.h"
#ifndef _PreComp_
# include <QPainter>
# include <QStyleOptionGraphicsItem>
#endif

#include <Base/Tools.h>
#include <Mod/TechDraw/App/DrawUtil.h>

#include "QGIHighlight.h"
#include "PreferencesGui.h"
#include "QGIViewPart.h"
#include "Rez.h"


using namespace TechDrawGui;
using namespace TechDraw;

QGIHighlight::QGIHighlight() :
    m_referenceAngle(0.0)
{
    m_refSize = 0.0;
    setInteractive(false);

    m_circle = new QGraphicsEllipseItem();
    addToGroup(m_circle);
    m_circle->setFlag(QGraphicsItem::ItemIsSelectable, false);

    m_rect = new QGCustomRect();
    addToGroup(m_rect);
    m_rect->setFlag(QGraphicsItem::ItemIsSelectable, false);

    m_reference = new QGCustomText();
    addToGroup(m_reference);
    m_reference->setFlag(QGraphicsItem::ItemIsSelectable, false);

    setWidth(Rez::guiX(0.75));
}

QGIHighlight::~QGIHighlight()
{

}

void QGIHighlight::onDragFinished()
{
//    Base::Console().Message("QGIH::onDragFinished - pos: %s\n",
//                            DrawUtil::formatVector(pos()).c_str());
    QGraphicsItem* parent = parentItem();
    auto qgivp = dynamic_cast<QGIViewPart*>(parent);
    if (qgivp) {
        qgivp->highlightMoved(this, pos());
    }
}

void QGIHighlight::draw()
{
    prepareGeometryChange();
    makeHighlight();
    makeReference();
    update();
}

void QGIHighlight::makeHighlight()
{
    QRectF r(m_start, m_end);
    m_circle->setRect(r);
    m_rect->setRect(r);
    if (getHoleStyle() == 0) {
        m_rect->hide();
        m_circle->show();
    } else {
        m_rect->show();
        m_circle->hide();
    }
}

void QGIHighlight::makeReference()
{
    prepareGeometryChange();
    int fontSize = QGIView::exactFontSize(m_refFont.family().toStdString(),
                                          m_refSize);
    m_refFont .setPixelSize(fontSize);
    m_reference->setFont(m_refFont);
    m_reference->setPlainText(m_refText);

    double vertOffset = 0.0;
    if (m_referenceAngle >= 0.0 &&
        m_referenceAngle <= 180.0) {
        //above the X axis
        //referenceText is positioned by top-left, need to adjust upwards by text height
        vertOffset = m_reference->boundingRect().height();
    } else {
        //below X axis. need to adjust upwards a bit because there is blank space above text
        vertOffset = m_reference->tightBoundingAdjust().y();
    }

    double horizOffset = 0.0;
    if (m_referenceAngle > 90.0 &&
        m_referenceAngle < 270.0) {
        //to left of Y axis
        horizOffset = -m_reference->boundingRect().width();
    }
    QRectF r(m_start, m_end);
    double radius = r.width() / 2.0;
    QPointF center = r.center();
    double angleRad = Base::toRadians(m_referenceAngle);
    double posX = center.x() + cos(angleRad) * radius + horizOffset;
    double posY = center.y() - sin(angleRad) * radius - vertOffset;
    m_reference->setPos(posX, posY);

    double highRot = rotation();
    if (!TechDraw::DrawUtil::fpCompare(highRot, 0.0)) {
        QRectF refBR = m_reference->boundingRect();
        QPointF refCenter = refBR.center();
        m_reference->setTransformOriginPoint(refCenter);
        m_reference->setRotation(-highRot);
    }
}

void QGIHighlight::setInteractive(bool state)
{
//    setAcceptHoverEvents(state);
    setFlag(QGraphicsItem::ItemIsSelectable, state);
    setFlag(QGraphicsItem::ItemIsMovable, state);
    setFlag(QGraphicsItem::ItemSendsScenePositionChanges, state);
    setFlag(QGraphicsItem::ItemSendsGeometryChanges, state);
}

void QGIHighlight::setBounds(double x1, double y1, double x2, double y2)
{
    m_start = QPointF(Rez::guiX(x1), Rez::guiX(-y1));
    m_end = QPointF(Rez::guiX(x2), Rez::guiX(-y2));
}

void QGIHighlight::setReference(const char* ref)
{
    m_refText = QString::fromUtf8(ref);
}

void QGIHighlight::setFont(QFont f, double fsize)
{
    m_refFont = f;
    m_refSize = fsize;
}


//obs?
QColor QGIHighlight::getHighlightColor()
{
    return PreferencesGui::sectionLineQColor();
}

int QGIHighlight::getHoleStyle()
{
    return TechDraw::Preferences::mattingStyle();
}

void QGIHighlight::paint ( QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget) {
    QStyleOptionGraphicsItem myOption(*option);
//    myOption.state &= ~QStyle::State_Selected;

    setTools();
//    painter->drawRect(boundingRect());          //good for debugging
    QGIDecoration::paint (painter, &myOption, widget);
}

void QGIHighlight::setTools()
{
    m_circle->setPen(m_pen);
    m_rect->setPen(m_pen);

    m_reference->setDefaultTextColor(m_pen.color());
}

void QGIHighlight::setLinePen(QPen isoPen)
{
    m_pen = isoPen;
}