/////////////////////////////////////////////////////////////////////////////////
//
//  Copyright (C) 2017     Statoil 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 "gtest/gtest.h"

#include "RiaCellDividingTools.h"
#include "RigMainGrid.h"

//--------------------------------------------------------------------------------------------------
/// Helper
//--------------------------------------------------------------------------------------------------
std::array<cvf::Vec3d, 8> createRegularCellCoords( cvf::Vec3d refPt, double xLen, double yLen, double zLen )
{
    std::array<cvf::Vec3d, 8> coords = {
        refPt + cvf::Vec3d( 0, 0, 0 ),
        refPt + cvf::Vec3d( xLen, 0, 0 ),
        refPt + cvf::Vec3d( xLen, yLen, 0 ),
        refPt + cvf::Vec3d( 0, yLen, 0 ),
        refPt + cvf::Vec3d( 0, 0, zLen ),
        refPt + cvf::Vec3d( xLen, 0, zLen ),
        refPt + cvf::Vec3d( xLen, yLen, zLen ),
        refPt + cvf::Vec3d( 0, yLen, zLen ),
    };
    return coords;
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
TEST( RiaCellDividingTools, flowDistanceCubicMainCell_AreaPointInCenter )
{
    std::array<cvf::Vec3d, 8> mainCellCorners = createRegularCellCoords( cvf::Vec3d( 10, 10, 10 ), 10, 10, 10 );
    cvf::Vec3d                point( 15, 15, 15 );

    double dist = RiaCellDividingTools::computeFlowDistance( mainCellCorners, point );

    double expectedDist = ( ( cvf::Vec3d( 12.5, 12.5, 12.5 ) - point ).length() + ( cvf::Vec3d( 17.5, 12.5, 12.5 ) - point ).length() +
                            ( cvf::Vec3d( 12.5, 17.5, 12.5 ) - point ).length() + ( cvf::Vec3d( 17.5, 17.5, 12.5 ) - point ).length() +
                            ( cvf::Vec3d( 12.5, 12.5, 17.5 ) - point ).length() + ( cvf::Vec3d( 17.5, 12.5, 17.5 ) - point ).length() +
                            ( cvf::Vec3d( 12.5, 17.5, 17.5 ) - point ).length() + ( cvf::Vec3d( 17.5, 17.5, 17.5 ) - point ).length() ) /
                          8;

    EXPECT_NEAR( expectedDist, dist, 1e-6 );
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
TEST( RiaCellDividingTools, flowDistanceCubicMainCell_AreaPointNearCorner )
{
    std::array<cvf::Vec3d, 8> mainCellCorners = createRegularCellCoords( cvf::Vec3d( 10, 10, 10 ), 10, 10, 10 );
    cvf::Vec3d                point( 11, 11, 11 );

    double dist = RiaCellDividingTools::computeFlowDistance( mainCellCorners, point );

    double expectedDist = ( ( cvf::Vec3d( 12.5, 12.5, 12.5 ) - point ).length() + ( cvf::Vec3d( 17.5, 12.5, 12.5 ) - point ).length() +
                            ( cvf::Vec3d( 12.5, 17.5, 12.5 ) - point ).length() + ( cvf::Vec3d( 17.5, 17.5, 12.5 ) - point ).length() +
                            ( cvf::Vec3d( 12.5, 12.5, 17.5 ) - point ).length() + ( cvf::Vec3d( 17.5, 12.5, 17.5 ) - point ).length() +
                            ( cvf::Vec3d( 12.5, 17.5, 17.5 ) - point ).length() + ( cvf::Vec3d( 17.5, 17.5, 17.5 ) - point ).length() ) /
                          8;

    EXPECT_NEAR( expectedDist, dist, 1e-6 );
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
TEST( RiaCellDividingTools, flowDistanceHighMainCell_AreaPointNearLowerCorner )
{
    std::array<cvf::Vec3d, 8> mainCellCorners = createRegularCellCoords( cvf::Vec3d( 10, 10, 10 ), 10, 10, 100 );
    cvf::Vec3d                point( 11, 11, 11 );

    double dist = RiaCellDividingTools::computeFlowDistance( mainCellCorners, point );

    double expectedDist = ( ( cvf::Vec3d( 12.5, 12.5, 35 ) - point ).length() + ( cvf::Vec3d( 17.5, 12.5, 35 ) - point ).length() +
                            ( cvf::Vec3d( 12.5, 17.5, 35 ) - point ).length() + ( cvf::Vec3d( 17.5, 17.5, 35 ) - point ).length() +
                            ( cvf::Vec3d( 12.5, 12.5, 85 ) - point ).length() + ( cvf::Vec3d( 17.5, 12.5, 85 ) - point ).length() +
                            ( cvf::Vec3d( 12.5, 17.5, 85 ) - point ).length() + ( cvf::Vec3d( 17.5, 17.5, 85 ) - point ).length() ) /
                          8;

    EXPECT_NEAR( expectedDist, dist, 1e-6 );
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
TEST( RigCellGeometryTools, lgrNodesTest )
{
    std::array<cvf::Vec3d, 8> mainCellCorners = createRegularCellCoords( cvf::Vec3d( 10, 10, 10 ), 36, 18, 18 );
    auto                      coords          = RiaCellDividingTools::createHexCornerCoords( mainCellCorners, 6, 3, 3 );
}