/*
 * LibrePCB - Professional EDA for everyone!
 * Copyright (C) 2013 LibrePCB Developers, see AUTHORS.md for contributors.
 * https://librepcb.org/
 *
 * 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 3 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/>.
 */

/*******************************************************************************
 *  Includes
 ******************************************************************************/
#include "sgi_netlabel.h"

#include "../../../application.h"
#include "../../../graphics/linegraphicsitem.h"
#include "../../circuit/netsignal.h"
#include "../../project.h"
#include "../items/si_netlabel.h"
#include "../items/si_netsegment.h"
#include "../schematic.h"
#include "../schematiclayerprovider.h"

#include <QtCore>
#include <QtWidgets>

/*******************************************************************************
 *  Namespace
 ******************************************************************************/
namespace librepcb {

QVector<QLineF> SGI_NetLabel::sOriginCrossLines;

/*******************************************************************************
 *  Constructors / Destructor
 ******************************************************************************/

SGI_NetLabel::SGI_NetLabel(SI_NetLabel& netlabel) noexcept
  : SGI_Base(), mNetLabel(netlabel) {
  setZValue(Schematic::ZValue_NetLabels);

  mStaticText.setTextFormat(Qt::PlainText);
  mStaticText.setPerformanceHint(QStaticText::AggressiveCaching);

  mFont = qApp->getDefaultMonospaceFont();
  mFont.setPixelSize(4);

  if (sOriginCrossLines.isEmpty()) {
    qreal crossSizePx = Length(400000).toPx();
    sOriginCrossLines.append(QLineF(-crossSizePx, 0, crossSizePx, 0));
    sOriginCrossLines.append(QLineF(0, -crossSizePx, 0, crossSizePx));
  }

  // create anchor graphics item
  mAnchorGraphicsItem.reset(new LineGraphicsItem(this));
  mAnchorGraphicsItem->setLayer(
      getLayer(GraphicsLayer::sSchematicNetLabelAnchors));

  updateCacheAndRepaint();
}

SGI_NetLabel::~SGI_NetLabel() noexcept {
}

/*******************************************************************************
 *  General Methods
 ******************************************************************************/

void SGI_NetLabel::updateCacheAndRepaint() noexcept {
  prepareGeometryChange();

  mRotate180 = Toolbox::isTextUpsideDown(mNetLabel.getRotation(), false);

  mStaticText.setText(*mNetLabel.getNetSignalOfNetSegment().getName());
  mStaticText.prepare(QTransform(), mFont);
  mTextOrigin.setX(mRotate180 ? -mStaticText.size().width() : 0);
  mTextOrigin.setY(mRotate180 ? 0 : -mStaticText.size().height());
  mStaticText.prepare(QTransform()
                          .rotate(mRotate180 ? 180 : 0)
                          .translate(mTextOrigin.x(), mTextOrigin.y()),
                      mFont);

  QRectF rect =
      QRectF(0, 0, mStaticText.size().width(), -mStaticText.size().height())
          .normalized();
  qreal len = sOriginCrossLines[0].length();
  mBoundingRect =
      rect.united(QRectF(-len / 2, -len / 2, len, len)).normalized();

  update();
}

void SGI_NetLabel::setAnchor(const Point& pos) noexcept {
  mAnchorGraphicsItem->setLine(Point(),
                               Point::fromPx(mapFromScene(pos.toPxQPointF())));
}

/*******************************************************************************
 *  Inherited from QGraphicsItem
 ******************************************************************************/

void SGI_NetLabel::paint(QPainter* painter,
                         const QStyleOptionGraphicsItem* option,
                         QWidget* widget) {
  Q_UNUSED(widget);
  const qreal lod =
      option->levelOfDetailFromTransform(painter->worldTransform());

  bool highlight = mNetLabel.isSelected() ||
      mNetLabel.getNetSignalOfNetSegment().isHighlighted();

  GraphicsLayer* layer = getLayer(GraphicsLayer::sSchematicReferences);
  Q_ASSERT(layer);
  if ((layer->isVisible()) && (lod > 2)) {
    // draw origin cross
    painter->setPen(QPen(layer->getColor(highlight), 0));
    painter->drawLines(sOriginCrossLines);
  }

  layer = getLayer(GraphicsLayer::sSchematicNetLabels);
  Q_ASSERT(layer);
  if ((layer->isVisible()) && (lod > 1)) {
    // draw text
    painter->setPen(QPen(layer->getColor(highlight), 0));
    painter->setFont(mFont);
    if (mRotate180) {
      painter->save();
      painter->rotate(180);
      painter->drawStaticText(mTextOrigin, mStaticText);
      painter->restore();
    } else
      painter->drawStaticText(mTextOrigin, mStaticText);
  } else {
    // draw filled rect
    painter->setPen(Qt::NoPen);
    painter->setBrush(QBrush(layer->getColor(highlight), Qt::Dense5Pattern));
    painter->drawRect(mBoundingRect);
  }
}

/*******************************************************************************
 *  Private Methods
 ******************************************************************************/

GraphicsLayer* SGI_NetLabel::getLayer(const QString& name) const noexcept {
  return mNetLabel.getProject().getLayers().getLayer(name);
}

/*******************************************************************************
 *  End of File
 ******************************************************************************/

}  // namespace librepcb
