/*
 * Copyright (C) 2005-2020 Centre National d'Etudes Spatiales (CNES)
 *
 * This file is part of Orfeo Toolbox
 *
 *     https://www.orfeo-toolbox.org/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "mvdProjectionBarWidget.h"
#include "ui_mvdProjectionBarWidget.h"

namespace mvd
{

ProjectionBarWidget::ProjectionBarWidget(QWidget* p, Qt::WindowFlags flags) : QWidget(p, flags), m_UI(new mvd::Ui::ProjectionBarWidget())
{
  m_UI->setupUi(this);
}

ProjectionBarWidget::~ProjectionBarWidget()
{
  delete m_UI;
  m_UI = NULL;
}

void ProjectionBarWidget::SetProjectionScale(double scale_x, double)
{
  QString text = "1:1";

  if (scale_x > 1.0)
    text = QString("%1:1").arg(scale_x);

  else if (scale_x < 1.0)
    text = QString("1:%1").arg(1.0 / scale_x);

  m_UI->projectionScaleLineEdit->setText(text);
}

void ProjectionBarWidget::on_projectionScaleLineEdit_returnPressed()
{
  ChangeScale();
}

void ProjectionBarWidget::on_projectionScaleLineEdit_editingFinished()
{
  if (m_UI->projectionScaleLineEdit->isModified())
  {
    ChangeScale();
  }
}

void ProjectionBarWidget::ChangeScale()
{
  // Cancel if scale text is empty.
  if (m_UI->projectionScaleLineEdit->text().isEmpty())
    return;

  // Split scale text.
  QStringList scale(m_UI->projectionScaleLineEdit->text().split(':'));

  if (scale.size() != 1 && scale.size() != 2)
    return;

  // Convert scale numerator.
  bool   isOk      = true;
  double numerator = scale.front().toDouble(&isOk);

  if (!isOk || numerator == 0.0)
    return;

  // Convert scale denominator.
  double denominator = 1.0;

  if (scale.size() > 1)
  {
    denominator = scale.back().toDouble(&isOk);
    if (!isOk)
      return;
  }

  // Emit scale changed.
  emit ProjectionScaleChanged(numerator / denominator);
}
}
