/***************************************************************************
 *   Copyright (c) Jürgen Riegel          (juergen.riegel@web.de) 2002     *
 *                                                                         *
 *   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 <gp_Trsf.hxx>
# include <gp_Ax1.hxx>
# include <BRepBuilderAPI_MakeShape.hxx>
# include <BRepAlgoAPI_Fuse.hxx>
# include <BRepAlgoAPI_Common.hxx>
# include <TopTools_ListIteratorOfListOfShape.hxx>
# include <TopExp.hxx>
# include <TopExp_Explorer.hxx>
# include <TopTools_IndexedMapOfShape.hxx>
# include <Standard_Failure.hxx>
# include <TopoDS_Face.hxx>
# include <gp_Dir.hxx>
# include <gp_Pln.hxx> // for Precision::Confusion()
# include <Bnd_Box.hxx>
# include <BRepBndLib.hxx>
#endif


#include <strstream>
#include <Base/Console.h>
#include <Base/Writer.h>
#include <Base/Reader.h>
#include <Base/Exception.h>
#include <Base/FileInfo.h>
#include <Base/Stream.h>
#include <Base/Placement.h>
#include <Base/Rotation.h>
#include <App/FeaturePythonPyImp.h>

#include "PartFeature.h"
#include "PartFeaturePy.h"

using namespace Part;


PROPERTY_SOURCE(Part::Feature, App::GeoFeature)


Feature::Feature(void) 
{
    ADD_PROPERTY(Shape, (TopoDS_Shape()));
}

Feature::~Feature()
{
}

short Feature::mustExecute(void) const
{
    return GeoFeature::mustExecute();
}

App::DocumentObjectExecReturn *Feature::recompute(void)
{
    try {
        return App::GeoFeature::recompute();
    }
    catch (Standard_Failure) {
        Handle_Standard_Failure e = Standard_Failure::Caught();
        App::DocumentObjectExecReturn* ret = new App::DocumentObjectExecReturn(e->GetMessageString());
        if (ret->Why.empty()) ret->Why = "Unknown OCC exception";
        return ret;
    }
}

App::DocumentObjectExecReturn *Feature::execute(void)
{
    this->Shape.touch();
    return App::DocumentObject::StdReturn;
}

PyObject *Feature::getPyObject(void)
{
    if (PythonObject.is(Py::_None())){
        // ref counter is set to 1
        PythonObject = Py::Object(new PartFeaturePy(this),true);
    }
    return Py::new_reference_to(PythonObject); 
}

std::vector<PyObject *> Feature::getPySubObjects(const std::vector<std::string>& NameVec) const
{
    std::vector<PyObject *> temp;
    for(std::vector<std::string>::const_iterator it=NameVec.begin();it!=NameVec.end();++it){
        PyObject *obj = Shape.getShape().getPySubShape((*it).c_str());
        if(obj)
            temp.push_back(obj);
    }
    return temp;
}

void Feature::onChanged(const App::Property* prop)
{
    // if the placement has changed apply the change to the point data as well
    if (prop == &this->Placement) {
        TopoShape& shape = const_cast<TopoShape&>(this->Shape.getShape());
        shape.setTransform(this->Placement.getValue().toMatrix());
    }
    // if the point data has changed check and adjust the transformation as well
    else if (prop == &this->Shape) {
        if (this->isRecomputing()) {
            TopoShape& shape = const_cast<TopoShape&>(this->Shape.getShape());
            shape.setTransform(this->Placement.getValue().toMatrix());
        }
        else {
            Base::Placement p;
            // shape must not be null to override the placement
            if (!this->Shape.getValue().IsNull()) {
                p.fromMatrix(this->Shape.getShape().getTransform());
                if (p != this->Placement.getValue())
                    this->Placement.setValue(p);
            }
        }
    }
    
    GeoFeature::onChanged(prop);
}

TopLoc_Location Feature::getLocation() const
{
    Base::Placement pl = this->Placement.getValue();
    Base::Rotation rot(pl.getRotation());
    Base::Vector3d axis;
    double angle;
    rot.getValue(axis, angle);
    gp_Trsf trf;
    trf.SetRotation(gp_Ax1(gp_Pnt(), gp_Dir(axis.x, axis.y, axis.z)), angle);
    trf.SetTranslationPart(gp_Vec(pl.getPosition().x,pl.getPosition().y,pl.getPosition().z));
    return TopLoc_Location(trf);
}

ShapeHistory Feature::buildHistory(BRepBuilderAPI_MakeShape& mkShape, TopAbs_ShapeEnum type,
                                   const TopoDS_Shape& newS, const TopoDS_Shape& oldS)
{
    ShapeHistory history;
    history.type = type;

    TopTools_IndexedMapOfShape newM, oldM;
    TopExp::MapShapes(newS, type, newM); // map containing all old objects of type "type"
    TopExp::MapShapes(oldS, type, oldM); // map containing all new objects of type "type"

    // Look at all objects in the old shape and try to find the modified object in the new shape
    for (int i=1; i<=oldM.Extent(); i++) {
        bool found = false;
        TopTools_ListIteratorOfListOfShape it;
        // Find all new objects that are a modification of the old object (e.g. a face was resized)
        for (it.Initialize(mkShape.Modified(oldM(i))); it.More(); it.Next()) {
            found = true;
            for (int j=1; j<=newM.Extent(); j++) { // one old object might create several new ones!
                if (newM(j).IsPartner(it.Value())) {
                    history.shapeMap[i-1].push_back(j-1); // adjust indices to start at zero
                    break;
                }
            }
        }

        // Find all new objects that were generated from an old object (e.g. a face generated from an edge)
        for (it.Initialize(mkShape.Generated(oldM(i))); it.More(); it.Next()) {
            found = true;
            for (int j=1; j<=newM.Extent(); j++) {
                if (newM(j).IsPartner(it.Value())) {
                    history.shapeMap[i-1].push_back(j-1);
                    break;
                }
            }
        }

        if (!found) {
            // Find all old objects that don't exist any more (e.g. a face was completely cut away)
            if (mkShape.IsDeleted(oldM(i))) {
                history.shapeMap[i-1] = std::vector<int>();
            }
            else {
                // Mop up the rest (will this ever be reached?)
                for (int j=1; j<=newM.Extent(); j++) {
                    if (newM(j).IsPartner(oldM(i))) {
                        history.shapeMap[i-1].push_back(j-1);
                        break;
                    }
                }
            }
        }
    }

    return history;
}

ShapeHistory Feature::joinHistory(const ShapeHistory& oldH, const ShapeHistory& newH)
{
    ShapeHistory join;
    join.type = oldH.type;

    for (ShapeHistory::MapList::const_iterator it = oldH.shapeMap.begin(); it != oldH.shapeMap.end(); ++it) {
        int old_shape_index = it->first;
        if (it->second.empty())
            join.shapeMap[old_shape_index] = ShapeHistory::List();
        for (ShapeHistory::List::const_iterator jt = it->second.begin(); jt != it->second.end(); ++jt) {
            ShapeHistory::MapList::const_iterator kt = newH.shapeMap.find(*jt);
            if (kt != newH.shapeMap.end()) {
                ShapeHistory::List& ary = join.shapeMap[old_shape_index];
                ary.insert(ary.end(), kt->second.begin(), kt->second.end());
            }
        }
    }

    return join;
}

const TopoDS_Shape Feature::findOriginOf(const TopoDS_Shape& reference) {
/*    Base::Console().Error("Looking for origin of face in %s\n", this->getName());
    if (reference.ShapeType() == TopAbs_FACE) {
        // Find index of reference in the history
    }
*/
    return TopoDS_Shape();
}

    /// returns the type name of the ViewProvider
const char* Feature::getViewProviderName(void) const {
    return "PartGui::ViewProviderPart";
}

// ---------------------------------------------------------

PROPERTY_SOURCE(Part::FilletBase, Part::Feature)

FilletBase::FilletBase()
{
    ADD_PROPERTY(Base,(0));
    ADD_PROPERTY(Edges,(0,0,0));
    Edges.setSize(0);
}

short FilletBase::mustExecute() const
{
    if (Base.isTouched() || Edges.isTouched())
        return 1;
    return 0;
}

// ---------------------------------------------------------

PROPERTY_SOURCE(Part::FeatureExt, Part::Feature)



namespace App {
/// @cond DOXERR
PROPERTY_SOURCE_TEMPLATE(Part::FeaturePython, Part::Feature)
template<> const char* Part::FeaturePython::getViewProviderName(void) const {
    return "PartGui::ViewProviderPython";
}
template<> PyObject* Part::FeaturePython::getPyObject(void) {
    if (PythonObject.is(Py::_None())) {
        // ref counter is set to 1
        PythonObject = Py::Object(new FeaturePythonPyT<Part::PartFeaturePy>(this),true);
    }
    return Py::new_reference_to(PythonObject);
}
/// @endcond

// explicit template instantiation
template class PartExport FeaturePythonT<Part::Feature>;
}

// ----------------------------------------------------------------

#include <GProp_GProps.hxx>
#include <BRepGProp.hxx>
#include <gce_MakeLin.hxx>
#include <BRepIntCurveSurface_Inter.hxx>
#include <IntCurveSurface_IntersectionPoint.hxx>
#include <gce_MakeDir.hxx>

std::vector<Part::cutFaces> Part::findAllFacesCutBy(
        const TopoDS_Shape& shape, const TopoDS_Shape& face, const gp_Dir& dir)
{
    // Find the centre of gravity of the face
    GProp_GProps props;
    BRepGProp::SurfaceProperties(face,props);
    gp_Pnt cog = props.CentreOfMass();

    // create a line through the centre of gravity
    gp_Lin line = gce_MakeLin(cog, dir);

    // Find intersection of line with all faces of the shape
    std::vector<cutFaces> result;
    BRepIntCurveSurface_Inter mkSection;
    // TODO: Less precision than Confusion() should be OK?

    for (mkSection.Init(shape, line, Precision::Confusion()); mkSection.More(); mkSection.Next()) {
        gp_Pnt iPnt = mkSection.Pnt();
        double dsq = cog.SquareDistance(iPnt);

        if (dsq < Precision::Confusion())
            continue; // intersection with original face

        // Find out which side of the original face the intersection is on
        gce_MakeDir mkDir(cog, iPnt);
        if (!mkDir.IsDone())
            continue; // some error (appears highly unlikely to happen, though...)

        if (mkDir.Value().IsOpposite(dir, Precision::Confusion()))
            continue; // wrong side of face (opposite to extrusion direction)

        cutFaces newF;
        newF.face = mkSection.Face();
        newF.distsq = dsq;
        result.push_back(newF);
    }

    return result;
}

const bool Part::checkIntersection(const TopoDS_Shape& first, const TopoDS_Shape& second,
                                   const bool quick, const bool touch_is_intersection) {
    Bnd_Box first_bb, second_bb;
    BRepBndLib::Add(first, first_bb);
    first_bb.SetGap(0);
    BRepBndLib::Add(second, second_bb);
    second_bb.SetGap(0);

    // Note: This test fails if the objects are touching one another at zero distance
    if (first_bb.IsOut(second_bb))
        return false; // no intersection
    if (quick)
        return true; // assumed intersection

    // Try harder
    if (touch_is_intersection) {
        // If both shapes fuse to a single solid, then they intersect
        BRepAlgoAPI_Fuse mkFuse(first, second);
        if (!mkFuse.IsDone())
            return false;
        if (mkFuse.Shape().IsNull())
            return false;

        // Did we get one or two solids?
        TopExp_Explorer xp;
        xp.Init(mkFuse.Shape(),TopAbs_SOLID);
        if (xp.More()) {
            // At least one solid
            xp.Next();
            return (xp.More() == Standard_False);
        } else {
            return false;
        }
    } else {
        // If both shapes have common material, then they intersect
        BRepAlgoAPI_Common mkCommon(first, second);
        if (!mkCommon.IsDone())
            return false;
        if (mkCommon.Shape().IsNull())
            return false;

        // Did we get a solid?
        TopExp_Explorer xp;
        xp.Init(mkCommon.Shape(),TopAbs_SOLID);
        return (xp.More() == Standard_True);
    }
}