/////////////////////////////////////////////////////////////////////////////////
//
//  Copyright (C) 2018-     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 "RiaViewRedrawScheduler.h"
#include "Rim3dView.h"

#include <QCoreApplication>
#include <QTimer>

#include "cafProgressState.h"
#include <set>

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
RiaViewRedrawScheduler* RiaViewRedrawScheduler::instance()
{
    static RiaViewRedrawScheduler theInstance;

    return &theInstance;
}

//--------------------------------------------------------------------------------------------------
/// Schedule a creation of the Display model and redraw of the reservoir view
/// The redraw will happen as soon as the event loop is entered
//--------------------------------------------------------------------------------------------------
void RiaViewRedrawScheduler::scheduleDisplayModelUpdateAndRedraw( Rim3dView* resViewToUpdate )
{
    m_resViewsToUpdate.push_back( resViewToUpdate );

    startTimer( 0 );
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RiaViewRedrawScheduler::clearViewsScheduledForUpdate()
{
    if ( m_resViewUpdateTimer )
    {
        while ( m_resViewUpdateTimer->isActive() )
        {
            QCoreApplication::processEvents();
        }
    }
    m_resViewsToUpdate.clear();
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RiaViewRedrawScheduler::updateAndRedrawScheduledViews()
{
    // Compress to remove duplicates
    // and update dependent views after independent views

    std::set<Rim3dView*> independent3DViewsToUpdate;
    std::set<Rim3dView*> dependent3DViewsToUpdate;

    for ( size_t i = 0; i < m_resViewsToUpdate.size(); ++i )
    {
        if ( !m_resViewsToUpdate[i] ) continue;

        if ( m_resViewsToUpdate[i]->viewController() )
            dependent3DViewsToUpdate.insert( m_resViewsToUpdate[i] );
        else
            independent3DViewsToUpdate.insert( m_resViewsToUpdate[i] );
    }

    for ( std::set<Rim3dView*>::iterator it = independent3DViewsToUpdate.begin(); it != independent3DViewsToUpdate.end();
          ++it )
    {
        if ( *it )
        {
            ( *it )->createDisplayModelAndRedraw();
        }
    }

    for ( std::set<Rim3dView*>::iterator it = dependent3DViewsToUpdate.begin(); it != dependent3DViewsToUpdate.end(); ++it )
    {
        if ( *it )
        {
            ( *it )->createDisplayModelAndRedraw();
        }
    }

    m_resViewsToUpdate.clear();
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RiaViewRedrawScheduler::slotUpdateAndRedrawScheduledViewsWhenReady()
{
    if ( caf::ProgressState::isActive() )
    {
        startTimer( 100 );
        return;
    }

    updateAndRedrawScheduledViews();
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void RiaViewRedrawScheduler::startTimer( int msecs )
{
    if ( !m_resViewUpdateTimer )
    {
        m_resViewUpdateTimer = new QTimer( this );
        connect( m_resViewUpdateTimer, SIGNAL( timeout() ), this, SLOT( slotUpdateAndRedrawScheduledViewsWhenReady() ) );
    }

    if ( !m_resViewUpdateTimer->isActive() )
    {
        m_resViewUpdateTimer->setSingleShot( true );
        m_resViewUpdateTimer->start( msecs );
    }
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
RiaViewRedrawScheduler::~RiaViewRedrawScheduler()
{
    delete m_resViewUpdateTimer;
}