//---------------------------------------------------------------------------
//
// Project: OpenWalnut ( http://www.openwalnut.org )
//
// Copyright 2009 OpenWalnut Community, BSV@Uni-Leipzig and CNCF@MPI-CBS
// For more information see http://www.openwalnut.org/copying
//
// This file is part of OpenWalnut.
//
// OpenWalnut 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 3 of the License, or
// (at your option) any later version.
//
// OpenWalnut 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 for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with OpenWalnut. If not, see <http://www.gnu.org/licenses/>.
//
//---------------------------------------------------------------------------

#include <sstream>
#include <cmath>
#include <string>

#include <boost/lexical_cast.hpp>

#include "../../../common/WLogger.h"
#include "../../../common/WPropertyVariable.h"

#include "WPropertyDoubleWidget.h"

WPropertyDoubleWidget::WPropertyDoubleWidget( WPropDouble property, QGridLayout* propertyGrid, QWidget* parent ):
    WPropertyWidget( property, propertyGrid, parent ),
    m_doubleProperty( property ),
    m_slider( Qt::Horizontal, &m_parameterWidgets ),
    m_edit( &m_parameterWidgets ),
    m_layout( &m_parameterWidgets )
{
    // initialize members
    m_edit.resize( m_edit.minimumSizeHint().width() *.8 , m_edit.size().height() );
    m_edit.setMaximumWidth( m_edit.minimumSizeHint().width() );

    // layout both against each other
    m_layout.addWidget( &m_slider );
    m_layout.addWidget( &m_edit );

    m_parameterWidgets.setLayout( &m_layout );

    update();

    // connect the modification signal of the edit and slider with our callback
    connect( &m_slider, SIGNAL( valueChanged( int ) ), this, SLOT( sliderChanged( int ) ) );
    connect( &m_edit, SIGNAL( returnPressed() ), this, SLOT( editChanged() ) );
    connect( &m_edit, SIGNAL( textEdited( const QString& ) ), this, SLOT( textEdited( const QString& ) ) );
}

WPropertyDoubleWidget::~WPropertyDoubleWidget()
{
    // cleanup
}

/**
 * Helper function converting a double into a nice formatted string.
 *
 * \param value the value to convert
 *
 * \return a string containing the double in a nicely formatted way.
 */
std::string toString( double value )
{
    std::ostringstream o;
    o.precision( 5 );
    o << value;
    return o.str();
}

void WPropertyDoubleWidget::update()
{
    // get the min constraint
    WPVDouble::PropertyConstraintMin minC = m_doubleProperty->getMin();
    m_min = 0;
    if ( minC.get() )
    {
        m_min = minC->getMin();
    }
    else
    {
        WLogger::getLogger()->addLogMessage(
                std::string( "The property has no minimum constraint. You should define it to avoid unexpected behaviour." ) +
                std::string( "Using default (" + boost::lexical_cast< std::string >( m_min ) + ")." ),
                "PropertyWidget( " + m_doubleProperty->getName() + " )", LL_WARNING );
    }

    // get the max constraint
    WPVDouble::PropertyConstraintMax maxC = m_doubleProperty->getMax();
    m_max = 100;
    if ( maxC.get() )
    {
        m_max = maxC->getMax();
    }
    else
    {
        WLogger::getLogger()->addLogMessage(
                std::string( "The property has no maximum constraint. You should define it to avoid unexpected behaviour." ) +
                std::string( "Using default (" + boost::lexical_cast< std::string >( m_max ) + ")." ),
                "PropertyWidget( " + m_doubleProperty->getName() + " )", LL_WARNING );
    }

    // setup the slider
    m_slider.setMinimum( 0 );
    m_slider.setMaximum( 100 );

    // calculate maximum size of the text widget.
    // XXX: this is not the optimal way but works for now
    // int length = m_min < 0 ? 5 : 4;   // reserve some extra space for the "-" in negative numbers
    // double fmax = std::max( std::abs( m_min ), std::abs( m_max ) );    // use the number with the most numbers
    // while ( ( fmax / 10 ) >= 1.0 )
    // {
    //     ++length;
    //     fmax /= 10.0;
    // }
    int length = 6; // use fixed length to have a uniform look among several widgets

    // resize the text widget
    //m_edit.setMaxLength( length );
    m_edit.setMaximumWidth( m_edit.minimumSizeHint().width() * length / 2 );
//     m_edit.setMinimumWidth( m_edit.minimumSizeHint().width() * length / 4 );
//     m_edit.resize( m_edit.minimumSizeHint().width() * length / 2, m_edit.size().height() );

    // set the initial values
    m_edit.setText( QString( toString( m_doubleProperty->get() ).c_str() ) );
    m_slider.setValue( toPercent( m_doubleProperty->get() ) );
}

int WPropertyDoubleWidget::toPercent( double value )
{
    return 100.0 * ( ( value - m_min ) / ( m_max - m_min ) );
}

double WPropertyDoubleWidget::fromPercent( int perc )
{
    return ( static_cast< double >( perc ) / 100.0 ) * ( m_max - m_min ) + m_min;
}

void WPropertyDoubleWidget::sliderChanged( int value )
{
    // set to the property
    invalidate( !m_doubleProperty->set( fromPercent( value ) ) );    // NOTE: set automatically checks the validity of the value

    // set the value in the line edit
    m_edit.setText( QString( toString( m_doubleProperty->get() ).c_str() ) );
}

void WPropertyDoubleWidget::editChanged()
{
    // set the value in the line edit
    bool valid;
    double value = m_edit.text().toDouble( &valid );
    if ( !valid )
    {
        invalidate();
        return;
    }

    // update slider
    m_slider.setValue( toPercent( value ) );

    // set to the property
    invalidate( !m_doubleProperty->set( value ) );    // NOTE: set automatically checks the validity of the value
}

void WPropertyDoubleWidget::textEdited( const QString& text )
{
    // this method does NOT set the property actually, but tries to validate it
    bool valid;

    double value = text.toDouble( &valid );
    if ( !valid )
    {
        invalidate();
        return;
    }

    // simply check validity
    invalidate( !m_doubleProperty->accept( value ) );
}