//##################################################################################################
//
//   Custom Visualization Core library
//   Copyright (C) 2011-2013 Ceetron AS
//
//   This library may be used under the terms of either the GNU General Public License or
//   the GNU Lesser General Public License as follows:
//
//   GNU General Public License Usage
//   This library 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 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 General Public License at <<http://www.gnu.org/licenses/gpl.html>>
//   for more details.
//
//   GNU Lesser General Public License Usage
//   This library is free software; you can redistribute it and/or modify
//   it under the terms of the GNU Lesser General Public License as published by
//   the Free Software Foundation; either version 2.1 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 Lesser General Public License at <<http://www.gnu.org/licenses/lgpl-2.1.html>>
//   for more details.
//
//##################################################################################################

#include "cafPdmUiDoubleSliderEditor.h"

#include "cafPdmField.h"
#include "cafPdmUiFieldHandle.h"
#include "cafPdmUiObjectHandle.h"
#include "cafQShortenedLabel.h"

#include <QDoubleValidator>
#include <QHBoxLayout>

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
class PdmDoubleValidator : public QDoubleValidator
{
public:
    explicit PdmDoubleValidator( QObject* parent = nullptr )
        : QDoubleValidator( parent )
    {
    }

    PdmDoubleValidator( double bottom, double top, int decimals, QObject* parent )
        : QDoubleValidator( bottom, top, decimals, parent )
    {
    }

    ~PdmDoubleValidator() override {}

    //--------------------------------------------------------------------------------------------------
    ///
    //--------------------------------------------------------------------------------------------------
    void fixup( QString& stringValue ) const override
    {
        double doubleValue = stringValue.toDouble();
        doubleValue        = qBound( bottom(), doubleValue, top() );

        stringValue = QString::number( doubleValue, 'g', decimals() );
    }
};

namespace caf
{
CAF_PDM_UI_FIELD_EDITOR_SOURCE_INIT( PdmUiDoubleSliderEditor );

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void PdmUiDoubleSliderEditor::configureAndUpdateUi( const QString& uiConfigName )
{
    CAF_ASSERT( !m_lineEdit.isNull() );

    PdmUiFieldEditorHandle::updateLabelFromField( m_label, uiConfigName );

    m_lineEdit->setEnabled( !uiField()->isUiReadOnly( uiConfigName ) );
    m_slider->setEnabled( !uiField()->isUiReadOnly( uiConfigName ) );

    caf::PdmUiObjectHandle* uiObject = uiObj( uiField()->fieldHandle()->ownerObject() );
    if ( uiObject )
    {
        uiObject->editorAttribute( uiField()->fieldHandle(), uiConfigName, &m_attributes );
    }

    double  doubleValue = uiField()->uiValue().toDouble();
    QString textValue   = uiField()->uiValue().toString();

    m_slider->blockSignals( true );
    m_slider->setMaximum( m_attributes.m_sliderTickCount );
    m_slider->blockSignals( false );

    PdmDoubleValidator* pdmValidator =
        new PdmDoubleValidator( m_attributes.m_minimum, m_attributes.m_maximum, m_attributes.m_decimals, this );
    pdmValidator->fixup( textValue );

    m_lineEdit->setValidator( pdmValidator );
    m_lineEdit->setText( textValue );

    m_sliderValue = doubleValue;
    updateSliderPosition( doubleValue );
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
QWidget* PdmUiDoubleSliderEditor::createEditorWidget( QWidget* parent )
{
    QWidget* containerWidget = new QWidget( parent );

    QHBoxLayout* layout = new QHBoxLayout();
    layout->setMargin( 0 );
    containerWidget->setLayout( layout );

    m_lineEdit = new QLineEdit( containerWidget );
    m_lineEdit->setMaximumWidth( 100 );
    connect( m_lineEdit, SIGNAL( editingFinished() ), this, SLOT( slotEditingFinished() ) );

    m_slider = new QSlider( Qt::Horizontal, containerWidget );

    layout->addWidget( m_lineEdit );
    layout->addWidget( m_slider );

    connect( m_slider, SIGNAL( valueChanged( int ) ), this, SLOT( slotSliderValueChanged( int ) ) );
    connect( m_slider, SIGNAL( sliderReleased() ), this, SLOT( slotSliderReleased() ) );
    return containerWidget;
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
QWidget* PdmUiDoubleSliderEditor::createLabelWidget( QWidget* parent )
{
    m_label = new QShortenedLabel( parent );
    return m_label;
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void PdmUiDoubleSliderEditor::slotEditingFinished()
{
    QString textValue = m_lineEdit->text();

    double doubleVal = textValue.toDouble();
    doubleVal        = qBound( m_attributes.m_minimum, doubleVal, m_attributes.m_maximum );
    m_sliderValue    = doubleVal;

    writeValueToField( doubleVal );
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void PdmUiDoubleSliderEditor::slotSliderValueChanged( int value )
{
    double newDoubleValue = convertFromSliderValue( value );
    m_sliderValue         = newDoubleValue;

    if ( m_attributes.m_delaySliderUpdateUntilRelease )
    {
        m_lineEdit->setText( QString( "%1" ).arg( m_sliderValue ) );
    }
    else
    {
        writeValueToField( m_sliderValue );
    }
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void PdmUiDoubleSliderEditor::slotSliderReleased()
{
    writeValueToField( m_sliderValue );
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void PdmUiDoubleSliderEditor::updateSliderPosition( double value )
{
    int newSliderPosition = convertToSliderValue( value );
    if ( m_slider->value() != newSliderPosition )
    {
        m_slider->blockSignals( true );
        m_slider->setValue( newSliderPosition );
        m_slider->blockSignals( false );
    }
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void PdmUiDoubleSliderEditor::writeValueToField( double value )
{
    QVariant v = value;
    this->setValueToField( v );
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
int PdmUiDoubleSliderEditor::convertToSliderValue( double value )
{
    double exactSliderValue =
        m_slider->maximum() * ( value - m_attributes.m_minimum ) / ( m_attributes.m_maximum - m_attributes.m_minimum );

    int sliderValue = static_cast<int>( exactSliderValue + 0.5 );
    sliderValue     = qBound( m_slider->minimum(), sliderValue, m_slider->maximum() );

    return sliderValue;
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
double PdmUiDoubleSliderEditor::convertFromSliderValue( int sliderValue )
{
    double newDoubleValue = m_attributes.m_minimum +
                            sliderValue * ( m_attributes.m_maximum - m_attributes.m_minimum ) / m_slider->maximum();
    newDoubleValue = qBound( m_attributes.m_minimum, newDoubleValue, m_attributes.m_maximum );

    return newDoubleValue;
}

} // end namespace caf