/***************************************************************************
 *   Copyright (c) 2012 Imetric 3D GmbH                                    *
 *                                                                         *
 *   This file is part of the FreeCAD CAx development system.              *
 *                                                                         *
 *   This library is free software; you can redistribute it and/or         *
 *   modify it under the terms of the GNU Library General Public           *
 *   License as published by the Free Software Foundation; either          *
 *   version 2 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 Library General Public License for more details.                  *
 *                                                                         *
 *   You should have received a copy of the GNU Library General Public     *
 *   License along with this library; see the file COPYING.LIB. If not,    *
 *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
 *   Suite 330, Boston, MA  02111-1307, USA                                *
 *                                                                         *
 ***************************************************************************/

#ifndef MESHTRIM_H
#define MESHTRIM_H

#include <Base/ViewProj.h>

#include "MeshKernel.h"


namespace MeshCore
{

/**
 * Checks the facets in 2D and then trim them in 3D
 */
class MeshExport MeshTrimming
{
public:
    enum TMode
    {
        INNER,
        OUTER
    };

public:
    MeshTrimming(MeshKernel& mesh,
                 const Base::ViewProjMethod* pclProj,
                 const Base::Polygon2d& rclPoly);

public:
    /**
     * Checks all facets for intersection with the polygon and writes all touched facets into the
     * vector
     */
    void CheckFacets(const MeshFacetGrid& rclGrid, std::vector<FacetIndex>& raulFacets) const;

    /**
     * The facets from raulFacets will be trimmed or deleted and aclNewFacets gives the new
     * generated facets
     */
    void TrimFacets(const std::vector<FacetIndex>& raulFacets,
                    std::vector<MeshGeomFacet>& aclNewFacets);

    /**
     * Setter: Trimm INNER or OUTER
     */
    void SetInnerOrOuter(TMode tMode);

private:
    /**
     * Checks if the polygon cuts the facet
     */
    bool HasIntersection(const MeshGeomFacet& rclFacet) const;

    /**
     * Checks if a facet lies totally within a polygon
     */
    bool PolygonContainsCompleteFacet(bool bInner, FacetIndex ulIndex) const;

    /**
     * Creates new facets from edge points of the facet
     */
    bool CreateFacets(FacetIndex ulFacetPos,
                      int iSide,
                      const std::vector<Base::Vector3f>& raclPoints,
                      std::vector<MeshGeomFacet>& aclNewFacets);

    /**
     * Creates new facets from edge points of the facet and a point inside the facet
     */
    bool CreateFacets(FacetIndex ulFacetPos,
                      int iSide,
                      const std::vector<Base::Vector3f>& raclPoints,
                      Base::Vector3f& clP3,
                      std::vector<MeshGeomFacet>& aclNewFacets);

    /**
     * Checks if a polygon point lies within a facet
     */
    bool IsPolygonPointInFacet(FacetIndex ulIndex, Base::Vector3f& clPoint);

    /**
     * Calculates the two intersection points between polygonline and facet in 2D
     * and project the points back into 3D (not very exactly)
     */
    bool GetIntersectionPointsOfPolygonAndFacet(FacetIndex ulIndex,
                                                int& iSide,
                                                std::vector<Base::Vector3f>& raclPoints) const;

    void AdjustFacet(MeshFacet& facet, int iInd);

private:
    MeshKernel& myMesh;
    bool myInner {true};
    std::vector<MeshGeomFacet> myTriangles;
    const Base::ViewProjMethod* myProj;
    const Base::Polygon2d& myPoly;
};

}  // namespace MeshCore

#endif  // MESHTRIM_H