/***************************************************************************
 *   Copyright (c) 2015 Stefan Tröger <stefantroeger@gmx.net>              *
 *                                                                         *
 *   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                                *
 *                                                                         *
 ***************************************************************************/


#include "PreCompiled.h"
#ifndef _PreComp_
# include <cfloat>
#include <BRepBuilderAPI_MakeFace.hxx>
#endif

#include "ShapeBinder.h"
#include <Mod/Part/App/TopoShape.h>

#ifndef M_PI
#define M_PI       3.14159265358979323846
#endif

using namespace PartDesign;

// ============================================================================

PROPERTY_SOURCE(PartDesign::ShapeBinder, Part::Feature)

ShapeBinder::ShapeBinder()
{
    ADD_PROPERTY_TYPE(Support, (0,0), "",(App::PropertyType)(App::Prop_None),"Support of the geometry");
}

ShapeBinder::~ShapeBinder()
{
}

// TODO Move this to mustExecute/execute (2015-09-11, Fat-Zer)
void ShapeBinder::onChanged(const App::Property *prop)
{

    if(! this->isRestoring()){

        if(prop == &Support) {

            auto objs = Support.getValues();
            auto subs = Support.getSubValues();

            Shape.setValue(buildShapeFromReferences(objs, subs)._Shape);
        }

    }
    Part::Feature::onChanged(prop);
}

TopoShape ShapeBinder::buildShapeFromReferences(std::vector< App::DocumentObject* > objs, std::vector< std::string > subs) {

    if(objs.empty()) {
        //kee the shape as it is, maybe we are just used as a copy
        return TopoShape();
    }

    //we only allow part feature, so get the first one we find
    Part::Feature* obj = nullptr;
    int index = 0;
    while(!objs[index]->isDerivedFrom(Part::Feature::getClassTypeId()) && index < objs.size())
        index++;

    //do we have any part feature?
    if(index >= objs.size())
        return TopoShape();

    obj = static_cast<Part::Feature*>(objs[index]);

    //if we have no subshpape we use the whole shape
    if(subs[index].empty()) {
        return obj->Shape.getShape();
    }

    //if we use multiple subshapes we build a shape from them by fusing them together
    index = 0;
    TopoShape base;
    std::vector<TopoDS_Shape> operators;
    for(std::string sub : subs) {

        //we only allow subshapes from a single Part::Feature
        if(objs[index] != obj)
            continue;

        //in this mode the full shape is allowed, as we already started the subshape
        //prcessing
        if(sub.empty())
            continue;

        if(base.isNull())
            base = obj->Shape.getShape();
        else
            operators.push_back(obj->Shape.getShape().getSubShape(sub.c_str()));
    }

    base.multiFuse(operators);
    return base;
}


PROPERTY_SOURCE(PartDesign::ShapeBinder2D, Part::Part2DObject)

ShapeBinder2D::ShapeBinder2D() {

}

ShapeBinder2D::~ShapeBinder2D() {

}

void ShapeBinder2D::onChanged(const App::Property* prop) {

    if(! this->isRestoring()){

        if(prop == &Support) {

            auto objs = Support.getValues();
            auto subs = Support.getSubValues();

            Shape.setValue(ShapeBinder::buildShapeFromReferences(objs, subs)._Shape);
        }

    }
    Part::Feature::onChanged(prop);
}