/***************************************************************************
 *   Copyright (c) 2008 Jürgen Riegel <juergen.riegel@web.de>              *
 *                                                                         *
 *   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 <cstdlib>
#include <memory>


#include <App/Application.h>
#include <App/Document.h>
#include <App/DocumentObject.h>
#include <App/DocumentObjectPy.h>
#include <Base/Interpreter.h>
#include <Base/PlacementPy.h>
#include <Mod/Part/App/OCCError.h>

#include "FemMesh.h"
#include "FemMeshObject.h"
#include "FemMeshPy.h"
#ifdef FC_USE_VTK
# include "FemPostPipeline.h"
# include "FemVTKTools.h"
# include <LibraryVersions.h>
# include <vtkVersionMacros.h>
#endif

#ifdef FC_USE_VTK_PYTHON
# include <vtkPythonUtil.h>
#endif


namespace Fem
{
class Module: public Py::ExtensionModule<Module>
{
public:
    Module()
        : Py::ExtensionModule<Module>("Fem")
    {
        add_varargs_method(
            "open",
            &Module::open,
            "open(string) -- Create a new document and a Mesh::Import feature to "
            "load the file into the document."
        );
        add_varargs_method(
            "insert",
            &Module::insert,
            "insert(string|mesh,[string]) -- Load or insert a mesh into the given "
            "or active document."
        );
        add_varargs_method(
            "export",
            &Module::exporter,
            "export(list,string) -- Export a list of objects into a single file."
        );
        add_varargs_method("read", &Module::read, "Read a mesh from a file and returns a Mesh object.");
#ifdef FC_USE_VTK
        add_varargs_method("frdToVTK", &Module::frdToVTK, "Convert a .frd result file to VTK file");
        add_varargs_method(
            "readResult",
            &Module::readResult,
            "Read a CFD or Mechanical result (auto detect) from a file (file format "
            "detected from file suffix)"
        );
        add_varargs_method(
            "writeResult",
            &Module::writeResult,
            "write a CFD or FEM result (auto detect) to a file (file format "
            "detected from file suffix)"
        );
        add_varargs_method(
            "getVtkVersion",
            &Module::getVtkVersion,
            "Returns the VTK version FreeCAD is linked against"
        );
        add_varargs_method(
            "getVtkVersionNumber",
            &Module::getVtkVersionNumber,
            "Returns the VTK version FreeCAD is linked against as a number"
        );
        add_varargs_method(
            "vtkVersionCheck",
            &Module::vtkVersionCheck,
            "Returns VTK version number from `major`, `minor` and `build` values"
        );
# ifdef FC_USE_VTK_PYTHON
        add_varargs_method(
            "isVtkCompatible",
            &Module::isVtkCompatible,
            "Checks if the passed vtkObject is compatible with the c++ VTK version FreeCAD uses"
        );
# endif
#endif
        add_varargs_method(
            "show",
            &Module::show,
            "show(shape,[string]) -- Add the mesh to the active document or create "
            "one if no document exists."
        );
        initialize("This module is the Fem module.");  // register with Python
    }

private:
    Py::Object invoke_method_varargs(void* method_def, const Py::Tuple& args) override
    {
        try {
            return Py::ExtensionModule<Module>::invoke_method_varargs(method_def, args);
        }
        catch (const Standard_Failure& e) {
            std::string str;
            Standard_CString msg = e.GetMessageString();
            str += typeid(e).name();
            str += " ";
            if (msg) {
                str += msg;
            }
            else {
                str += "No OCCT Exception Message";
            }
            throw Py::Exception(Part::PartExceptionOCCError, str);
        }
        catch (const Base::Exception& e) {
            throw Py::RuntimeError(e.what());
        }
        catch (const std::exception& e) {
            throw Py::RuntimeError(e.what());
        }
    }
    Py::Object open(const Py::Tuple& args)
    {
        char* Name;
        if (!PyArg_ParseTuple(args.ptr(), "et", "utf-8", &Name)) {
            throw Py::Exception();
        }

        std::string EncodedName = std::string(Name);
        PyMem_Free(Name);

        std::unique_ptr<FemMesh> mesh(new FemMesh);
        mesh->read(EncodedName.c_str());
        Base::FileInfo file(EncodedName.c_str());
        // create new document and add Import feature
        App::Document* pcDoc = App::GetApplication().newDocument();
        FemMeshObject* pcFeature = pcDoc->addObject<FemMeshObject>(file.fileNamePure().c_str());
        pcFeature->Label.setValue(file.fileNamePure().c_str());
        pcFeature->FemMesh.setValuePtr(mesh.release());
        pcFeature->purgeTouched();

        return Py::None();
    }
    Py::Object insert(const Py::Tuple& args)
    {
        char* Name;
        const char* DocName = nullptr;
        if (!PyArg_ParseTuple(args.ptr(), "et|s", "utf-8", &Name, &DocName)) {
            throw Py::Exception();
        }

        std::string EncodedName = std::string(Name);
        PyMem_Free(Name);

        App::Document* pcDoc = nullptr;
        if (DocName) {
            pcDoc = App::GetApplication().getDocument(DocName);
        }
        else {
            pcDoc = App::GetApplication().getActiveDocument();
        }

        if (!pcDoc) {
            pcDoc = App::GetApplication().newDocument(DocName);
        }

        Base::FileInfo file(EncodedName.c_str());

        try {
            std::unique_ptr<FemMesh> mesh(new FemMesh);
            mesh->read(EncodedName.c_str());

            FemMeshObject* pcFeature = pcDoc->addObject<FemMeshObject>(file.fileNamePure().c_str());
            pcFeature->Label.setValue(file.fileNamePure().c_str());
            pcFeature->FemMesh.setValuePtr(mesh.release());
            pcFeature->purgeTouched();
        }
        catch (Base::Exception&) {
#ifdef FC_USE_VTK
            if (FemPostPipeline::canRead(file)) {

                auto* pcFeature = pcDoc->addObject<FemPostPipeline>(file.fileNamePure().c_str());

                pcFeature->Label.setValue(file.fileNamePure().c_str());
                pcFeature->read(file);
                pcFeature->touch();
                pcDoc->recomputeFeature(pcFeature);
            }
            else {
                throw;
            }
#else
            throw;
#endif
        }

        return Py::None();
    }
    Py::Object exporter(const Py::Tuple& args)
    {
        PyObject* object;
        char* Name;
        if (!PyArg_ParseTuple(args.ptr(), "Oet", &object, "utf-8", &Name)) {
            throw Py::Exception();
        }

        Base::FileInfo file(Name);
        PyMem_Free(Name);

        ParameterGrp::handle hGrp = App::GetApplication().GetParameterGroupByPath(
            "User parameter:BaseApp/Preferences/Mod/Fem"
        );

        Py::Sequence list(object);
        for (Py::Sequence::iterator it = list.begin(); it != list.end(); ++it) {
            PyObject* item = (*it).ptr();
            if (PyObject_TypeCheck(item, &(App::DocumentObjectPy::Type))) {
                App::DocumentObject* obj
                    = static_cast<App::DocumentObjectPy*>(item)->getDocumentObjectPtr();
                if (obj->isDerivedFrom<Fem::FemMeshObject>()) {
                    auto femMesh = static_cast<FemMeshObject*>(obj)->FemMesh.getValue();
                    if (file.hasExtension({"vtk", "vtu"})) {
                        // get VTK prefs
                        ParameterGrp::handle g = hGrp->GetGroup("InOutVtk");
                        std::string level = g->GetASCII("MeshExportLevel", "Highest");
                        femMesh.writeVTK(file.filePath().c_str(), level == "Highest" ? true : false);
                    }
                    else if (file.hasExtension("inp")) {
                        // get Abaqus inp prefs
                        ParameterGrp::handle g = hGrp->GetGroup("Abaqus");
                        int elemParam = g->GetInt("AbaqusElementChoice", 2);
                        bool groupParam = g->GetBool("AbaqusWriteGroups", true);
                        // write ABAQUS Output
                        femMesh.writeABAQUS(file.filePath(), elemParam, groupParam);
                    }
                    else {
                        femMesh.write(file.filePath().c_str());
                    }
                    return Py::None();
                }
            }
        }

        throw Py::RuntimeError("No FEM mesh for export selected");
    }
    Py::Object read(const Py::Tuple& args)
    {
        char* Name;
        if (!PyArg_ParseTuple(args.ptr(), "et", "utf-8", &Name)) {
            throw Py::Exception();
        }

        std::string EncodedName = std::string(Name);
        PyMem_Free(Name);

        std::unique_ptr<FemMesh> mesh(new FemMesh);
        mesh->read(EncodedName.c_str());
        return Py::asObject(new FemMeshPy(mesh.release()));
    }

#ifdef FC_USE_VTK
    Py::Object frdToVTK(const Py::Tuple& args)
    {
        char* filename = nullptr;
        PyObject* binary = Py_True;
        if (!PyArg_ParseTuple(args.ptr(), "et|O!", "utf-8", &filename, &PyBool_Type, &binary)) {
            throw Py::Exception();
        }
        std::string encodedName = std::string(filename);
        PyMem_Free(filename);

        FemVTKTools::frdToVTK(encodedName.c_str(), Base::asBoolean(binary));

        return Py::None();
    }

    Py::Object readResult(const Py::Tuple& args)
    {
        char* fileName = nullptr;
        char* objName = nullptr;

        if (!PyArg_ParseTuple(args.ptr(), "et|et", "utf-8", &fileName, "utf-8", &objName)) {
            throw Py::Exception();
        }
        std::string EncodedName = std::string(fileName);
        PyMem_Free(fileName);
        std::string resName = std::string(objName);
        PyMem_Free(objName);

        if (resName.length()) {
            App::Document* pcDoc = App::GetApplication().getActiveDocument();
            App::DocumentObject* obj = pcDoc->getObject(resName.c_str());
            FemVTKTools::readResult(EncodedName.c_str(), obj);
        }
        else {
            FemVTKTools::readResult(EncodedName.c_str());  // assuming activeObject can hold Result
        }

        return Py::None();
    }

    Py::Object writeResult(const Py::Tuple& args)
    {
        char* fileName = nullptr;
        PyObject* pcObj = nullptr;

        if (!PyArg_ParseTuple(
                args.ptr(),
                "et|O!",
                "utf-8",
                &fileName,
                &(App::DocumentObjectPy::Type),
                &pcObj
            )) {
            throw Py::Exception();
        }
        std::string EncodedName = std::string(fileName);
        PyMem_Free(fileName);

        if (pcObj) {
            if (PyObject_TypeCheck(pcObj, &(App::DocumentObjectPy::Type))) {
                App::DocumentObject* obj
                    = static_cast<App::DocumentObjectPy*>(pcObj)->getDocumentObjectPtr();
                FemVTKTools::writeResult(EncodedName.c_str(), obj);
            }
        }
        else {
            FemVTKTools::writeResult(EncodedName.c_str());
        }

        return Py::None();
    }

    Py::Object getVtkVersion(const Py::Tuple& args)
    {
        if (!PyArg_ParseTuple(args.ptr(), "")) {
            throw Py::Exception();
        }

        return Py::String(fcVtkVersion);
    }

    Py::Object getVtkVersionNumber(const Py::Tuple& args)
    {
        if (!PyArg_ParseTuple(args.ptr(), "")) {
            throw Py::Exception();
        }

        return Py::Long(VTK_VERSION_NUMBER);
    }

    Py::Object vtkVersionCheck(const Py::Tuple& args)
    {
        int major;
        int minor;
        int build = 0;
        if (!PyArg_ParseTuple(args.ptr(), "ii|i", &major, &minor, &build)) {
            throw Py::Exception();
        }

        return Py::Long(VTK_VERSION_CHECK(major, minor, build));
    }

# ifdef FC_USE_VTK_PYTHON
    Py::Object isVtkCompatible(const Py::Tuple& args)
    {
        PyObject* pcObj = nullptr;
        if (!PyArg_ParseTuple(args.ptr(), "O", &pcObj)) {
            throw Py::Exception();
        }

        // if none is returned the VTK object was created by another VTK library, and the
        // python api used to create it cannot be used with FreeCAD
        vtkObjectBase* obj = vtkPythonUtil::GetPointerFromObject(pcObj, "vtkObject");
        if (!obj) {
            PyErr_Clear();
            return Py::False();
        }
        return Py::True();
    }
# endif
#endif

    Py::Object show(const Py::Tuple& args)
    {
        PyObject* pcObj;
        const char* name = "Mesh";
        if (!PyArg_ParseTuple(args.ptr(), "O!|s", &(FemMeshPy::Type), &pcObj, &name)) {
            throw Py::Exception();
        }

        App::Document* pcDoc = App::GetApplication().getActiveDocument();
        if (!pcDoc) {
            pcDoc = App::GetApplication().newDocument();
        }

        FemMeshPy* pShape = static_cast<FemMeshPy*>(pcObj);
        Fem::FemMeshObject* pcFeature = pcDoc->addObject<Fem::FemMeshObject>(name);
        // copy the data
        pcFeature->FemMesh.setValue(*(pShape->getFemMeshPtr()));
        pcDoc->recompute();

        return Py::None();
    }
};

PyObject* initModule()
{
    return Base::Interpreter().addModule(new Module);
}

}  // namespace Fem