/*

  KLayout Layout Viewer
  Copyright (C) 2006-2017 Matthias Koefferlein

  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, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

*/


#include "layProgressWidget.h"

#include <math.h>

#include <QFrame>

namespace lay
{

// --------------------------------------------------------------------

class ProgressBarWidget
  : public QWidget 
{
public:
  ProgressBarWidget (QWidget *parent, const char *name = "");

  void set_value (double v, const std::string &value);

  QSize sizeHint () const 
  {
    return QSize (m_width, 1);
  }

  QSize minimumSizeHint () const 
  {
    return QSize (m_width, 1);
  }

private:
  double m_value;
  std::string m_value_string;
  int m_width;
  int m_length;
  int m_fw;
  int m_bw;

  void paintEvent (QPaintEvent *event); 
  void resizeEvent (QResizeEvent *event); 
};

ProgressBarWidget::ProgressBarWidget (QWidget *parent, const char *name)
  : QWidget (parent),
    m_value (0.0), m_width (64), m_length (0), m_fw (1), m_bw (0)
{
  setObjectName (QString::fromUtf8 (name));
  setMinimumSize (64, 10);
}

void
ProgressBarWidget::set_value (double v, const std::string &value)
{
  if (value != m_value_string) {
    update ();
    m_value_string = value;
  }

  m_value = v;
  int l = 0;
  if (m_width > 0) {
    l = int (floor ((v < 0.0 ? 0.0 : v) * 0.01 * (double (m_width - 2) - 1e-6))) % m_width;
  }
  if (l != m_length) {
    m_length = l;
    update ();
  }
}

void 
ProgressBarWidget::paintEvent (QPaintEvent *)
{
  QPainter painter (this);

  int right = width ();
  int bottom = height ();

  painter.fillRect (QRect (QPoint (m_fw, m_fw), QPoint (m_length + m_fw - 1, bottom - 1 - m_fw)), palette ().brush (QPalette::Highlight));
  painter.fillRect (QRect (QPoint (m_length + m_fw, m_fw), QPoint (right - 1 - m_fw, bottom - 1 - m_fw)), palette ().brush (QPalette::Base));
  painter.setPen (palette ().color (QPalette::Text));
  
  for (int d = 0; d < m_bw; ++d) {
    painter.drawRect (QRect (QPoint (d, d), QPoint (right - 1 - d, bottom - 1 - d)));
  }

  painter.setFont (font ());

  painter.setClipRect (QRect (QPoint (m_fw, m_fw), QPoint (m_length + m_fw - 1, bottom - m_fw)));
  painter.setPen (palette ().color (QPalette::HighlightedText));
  painter.drawText (rect (), Qt::AlignHCenter | Qt::AlignVCenter, tl::to_qstring (m_value_string));

  painter.setClipRect (QRect (QPoint (m_length + m_fw, 0), QPoint (right - m_fw, bottom - m_fw)));
  painter.setPen (palette ().color (QPalette::Text));
  painter.drawText (rect (), Qt::AlignHCenter | Qt::AlignVCenter, tl::to_qstring (m_value_string));
}

void
ProgressBarWidget::resizeEvent (QResizeEvent *)
{
  m_width = size ().width ();
  update ();
}

// --------------------------------------------------------------------

ProgressWidget::ProgressWidget (ProgressReporter *pr, QWidget *parent, bool full_width)
  : QFrame (parent),
    mp_pr (pr)
{
  QVBoxLayout *top_layout = new QVBoxLayout (this);
  top_layout->addStretch (1);

  QFrame *bar_frame = new QFrame (this);
  top_layout->addWidget (bar_frame);

  top_layout->addStretch (1);

  //  this does not allow the label to control the overall size, so a long string does not hurt:
  bar_frame->setSizePolicy (QSizePolicy::Ignored, QSizePolicy::Preferred);

  QHBoxLayout *layout = new QHBoxLayout (bar_frame);

  layout->setSpacing (4);
  layout->setMargin (0);

  if (! full_width) {
    layout->addStretch (1);
  }

  mp_label = new QLabel (bar_frame);
  layout->addWidget (mp_label);

  layout->addSpacing (8);

  QFrame *progress_bar_frame = new QFrame (bar_frame);
  progress_bar_frame->setFrameStyle (QFrame::Box | QFrame::Plain);
  progress_bar_frame->setSizePolicy (QSizePolicy::Expanding, QSizePolicy::Preferred);
  layout->addWidget (progress_bar_frame, 2);

  QHBoxLayout *pbf_layout = new QHBoxLayout (progress_bar_frame);
  progress_bar_frame->setLayout (pbf_layout);
  pbf_layout->setMargin (0);

  mp_progress_bar = new ProgressBarWidget (progress_bar_frame);
  pbf_layout->addWidget (mp_progress_bar);

  layout->addSpacing (8);

  mp_cancel_button = new QToolButton (bar_frame);
  mp_cancel_button->setText (QObject::tr ("Cancel"));
  layout->addWidget (mp_cancel_button);

  if (! full_width) {
    layout->addStretch (1);
  }

  connect (mp_cancel_button, SIGNAL (clicked ()), this, SLOT (signal_break ()));
}

void
ProgressWidget::set_can_cancel (bool f)
{
  mp_cancel_button->setEnabled (f);
}

void 
ProgressWidget::set_text (const std::string &text)
{
  mp_label->setText (tl::to_qstring (text));
}

void 
ProgressWidget::set_value (double v, const std::string &value)
{
  mp_progress_bar->set_value (v, value);
}

void 
ProgressWidget::signal_break ()
{
  mp_pr->signal_break ();
}

QSize  
ProgressWidget::sizeHint () const
{
  return QSize (400, 50);
}

}