/////////////////////////////////////////////////////////////////////////////////
//
//  Copyright (C) 2020 Equinor ASA
//
//  ResInsight 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.
//
//  ResInsight 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.
//
/////////////////////////////////////////////////////////////////////////////////

#include "RimColorLegend.h"

#include "RiaColorTools.h"

#include "Rim3dView.h"
#include "RimColorLegendItem.h"

#include "cafPdmFieldReorderCapability.h"
#include "cafPdmObjectScriptingCapability.h"

#include <algorithm>

CAF_PDM_SOURCE_INIT( RimColorLegend, "ColorLegend" );

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
RimColorLegend::RimColorLegend()
{
    CAF_PDM_InitScriptableObject( "ColorLegend", ":/Legend.png" );

    CAF_PDM_InitField( &m_colorLegendName, "ColorLegendName", QString( "" ), "Color Legend Name" );

    CAF_PDM_InitFieldNoDefault( &m_colorLegendItems, "ColorLegendItems", "" );
    m_colorLegendItems.uiCapability()->setUiTreeHidden( true );

    setDeletable( true );
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
RimColorLegend::~RimColorLegend()
{
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
QString RimColorLegend::colorLegendName()
{
    return m_colorLegendName;
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RimColorLegend::setColorLegendName( const QString& colorLegendName )
{
    m_colorLegendName = colorLegendName;
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RimColorLegend::setReadOnly( bool doReadOnly )
{
    m_colorLegendName.uiCapability()->setUiReadOnly( true );
    setDeletable( !doReadOnly );

    for ( auto colorLegendItem : m_colorLegendItems )
    {
        colorLegendItem->setReadOnly( true );
    }
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RimColorLegend::addReorderCapability()
{
    auto reorderability = caf::PdmFieldReorderCapability::addToField( &m_colorLegendItems );
    reorderability->orderChanged.connect( this, &RimColorLegend::orderChanged );
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RimColorLegend::appendColorLegendItem( RimColorLegendItem* colorLegendItem )
{
    m_colorLegendItems.push_back( colorLegendItem );
    onColorLegendItemHasChanged();
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
std::vector<RimColorLegendItem*> RimColorLegend::colorLegendItems() const
{
    return m_colorLegendItems.childrenByType();
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
caf::PdmFieldHandle* RimColorLegend::userDescriptionField()
{
    return &m_colorLegendName;
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RimColorLegend::fieldChangedByUi( const caf::PdmFieldHandle* changedField, const QVariant& oldValue, const QVariant& newValue )
{
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RimColorLegend::defineUiTreeOrdering( caf::PdmUiTreeOrdering& uiTreeOrdering, QString uiConfigName )
{
    setUiIcon( paletteIconProvider() );
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RimColorLegend::orderChanged( const caf::SignalEmitter* emitter )
{
    onColorLegendItemHasChanged();
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
cvf::Color3ubArray RimColorLegend::colorArray() const
{
    std::vector<RimColorLegendItem*> legendItems = colorLegendItems();

    // The interpolation algorithm requires minimum two levels
    size_t colorCount = std::max( size_t( 2 ), legendItems.size() );

    cvf::Color3ubArray colorArray( colorCount );
    colorArray.setAll( cvf::Color3ub::GRAY );

    for ( size_t i = 0; i < legendItems.size(); i++ )
    {
        colorArray.set( i, cvf::Color3ub( legendItems[i]->color() ) );
    }

    return colorArray;
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
caf::IconProvider RimColorLegend::paletteIconProvider() const
{
    std::vector<QString>             colorNames;
    std::vector<RimColorLegendItem*> legendItems = colorLegendItems();
    for ( auto legendItem : legendItems )
    {
        QColor color = RiaColorTools::toQColor( legendItem->color() );
        colorNames.push_back( color.name() );
    }
    caf::IconProvider iconProvider( QSize( 24, 16 ) );
    iconProvider.setBackgroundColorGradient( colorNames );
    return iconProvider;
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RimColorLegend::onColorLegendItemHasChanged()
{
    updateConnectedEditors();

    std::vector<caf::PdmObjectHandle*> referringObjects = objectsWithReferringPtrFields();

    for ( auto o : referringObjects )
    {
        o->uiCapability()->updateConnectedEditors();

        auto view = o->firstAncestorOrThisOfType<Rim3dView>();
        if ( view )
        {
            view->resetLegends();
            view->scheduleCreateDisplayModelAndRedraw();
        }
    }
}