// SPDX-FileCopyrightText: 2003 Dominique Devriese <devriese@kde.org>

// SPDX-License-Identifier: GPL-2.0-or-later

// mp: following a kind suggestion by David Faure the Python.h include has
// been moved before all qt includes in order to avoid a clash related to
// the "slots" identifier
// krazy:excludeall=includes
#undef _XOPEN_SOURCE // it will be defined inside Python
#include "python_scripter.h"
#include <Python.h>

#include <iostream>
#include <string>

#include <boost/mpl/bool.hpp>
#include <boost/python.hpp>

#include "../misc/common.h"
#include "../misc/coordinate.h"
#include "../misc/cubic-common.h"
#include "../misc/kigtransform.h"
#include "../objects/bogus_imp.h"
#include "../objects/circle_imp.h"
#include "../objects/common.h"
#include "../objects/cubic_imp.h"
#include "../objects/line_imp.h"
#include "../objects/other_imp.h"
#include "../objects/point_imp.h"
#include "../objects/polygon_imp.h"
#include "../objects/text_imp.h"

using namespace boost::python;

BOOST_PYTHON_MODULE_INIT(kig)
{
    class_<Coordinate>("Coordinate")
        .def(init<double, double>())
        .def(init<const Coordinate &>())
        .def("invalidCoord", &Coordinate::invalidCoord)
        .staticmethod("invalidCoord")
        .def("valid", &Coordinate::valid)
        .def("distance", &Coordinate::distance)
        .def("length", &Coordinate::length)
        .def("squareLength", &Coordinate::squareLength)
        .def("orthogonal", &Coordinate::orthogonal)
        .def("round", &Coordinate::round)
        .def("normalize", &Coordinate::normalize)
        .def(-self)
        //    .def( self = self )
        .def(self += self)
        .def(self -= self)
        .def(self *= other<double>())
        .def(self *= other<int>())
        .def(self /= other<double>())
        .def(self / other<double>())
        .def(self + self)
        .def(self - self)
        .def(self * other<double>())
        .def(other<double>() * self)
        .def(self * self)
        .def_readwrite("x", &Coordinate::x)
        .def_readwrite("y", &Coordinate::y);

    class_<LineData>("LineData")
        .def(init<Coordinate, Coordinate>())
        .def("dir", &LineData::dir)
        .def("length", &LineData::length)
        .def("isParallelTo", &LineData::isParallelTo)
        .def_readwrite("a", &LineData::a)
        .def_readwrite("b", &LineData::b);

    // we need this cause Transformation::apply is overloaded and
    // otherwise using Transformation::apply would be ambiguous..
    const Coordinate (Transformation::*transformapplyfunc)(const Coordinate &) const = &Transformation::apply;
    class_<Transformation>("Transformation", no_init)
        .def("apply", transformapplyfunc)
        .def("isHomothetic", &Transformation::isHomothetic)
        .def("inverse", &Transformation::inverse)
        .def("identity", &Transformation::identity)
        .def("translation", &Transformation::translation)
        .def("rotation", &Transformation::rotation)
        .def("pointReflection", &Transformation::pointReflection)
        .def("lineReflection", &Transformation::lineReflection)
        .def("castShadow", &Transformation::castShadow)
        .def("projectiveRotation", &Transformation::projectiveRotation)
        .def("scalingOverPoint", &Transformation::scalingOverPoint)
        .def("scalingOverLine", &Transformation::scalingOverLine)
        .def(self * self)
        .def(self == self)
        .staticmethod("identity")
        .staticmethod("translation")
        .staticmethod("rotation")
        .staticmethod("pointReflection")
        .staticmethod("lineReflection")
        .staticmethod("castShadow")
        .staticmethod("projectiveRotation")
        .staticmethod("scalingOverPoint")
        .staticmethod("scalingOverLine");

    class_<ObjectImpType, boost::noncopyable>("ObjectType", no_init)
        .def("fromInternalName", &ObjectImpType::typeFromInternalName, return_value_policy<reference_existing_object>())
        .staticmethod("fromInternalName")
        .def("inherits", &ObjectImpType::inherits)
        .def("internalName", &ObjectImpType::internalName)
        .def("translatedName", &ObjectImpType::translatedName)
        .def("selectStatement", &ObjectImpType::selectStatement)
        .def("removeAStatement", &ObjectImpType::removeAStatement)
        .def("addAStatement", &ObjectImpType::addAStatement)
        .def("moveAStatement", &ObjectImpType::moveAStatement)
        .def("attachToThisStatement", &ObjectImpType::attachToThisStatement);

    class_<ObjectImp, boost::noncopyable>("Object", no_init)
        .def("stype", &ObjectImp::stype, return_value_policy<reference_existing_object>())
        .staticmethod("stype")
        .def("inherits", &ObjectImp::inherits)
        .def("transform", &ObjectImp::transform, return_value_policy<manage_new_object>())
        .def("valid", &ObjectImp::valid)
        .def("copy", &ObjectImp::copy, return_value_policy<manage_new_object>())
        .def("equals", &ObjectImp::equals);

    class_<CurveImp, bases<ObjectImp>, boost::noncopyable>("Curve", no_init)
        .def("stype", &CurveImp::stype, return_value_policy<reference_existing_object>())
        .staticmethod("stype")
        //    .def( "getParam", &CurveImp::getParam )
        //    .def( "getPoint", &CurveImp::getPoint );
        ;
    class_<PointImp, bases<ObjectImp>>("Point", init<Coordinate>())
        .def("stype", &PointImp::stype, return_value_policy<reference_existing_object>())
        .staticmethod("stype")
        .def("coordinate", &PointImp::coordinate, return_internal_reference<1>())
        .def("setCoordinate", &PointImp::setCoordinate);

    class_<AbstractLineImp, bases<CurveImp>, boost::noncopyable>("AbstractLine", no_init)
        .def("stype", &AbstractLineImp::stype, return_value_policy<reference_existing_object>())
        .staticmethod("stype")
        .def("slope", &AbstractLineImp::slope)
        .def("equationString", &AbstractLineImp::equationString)
        .def("data", &AbstractLineImp::data);

    class_<SegmentImp, bases<AbstractLineImp>>("Segment", init<Coordinate, Coordinate>())
        .def("stype", &SegmentImp::stype, return_value_policy<reference_existing_object>())
        .staticmethod("stype")
        .def(init<LineData>())
        .def("length", &SegmentImp::length);

    class_<RayImp, bases<AbstractLineImp>>("Ray", init<Coordinate, Coordinate>())
        .def("stype", &RayImp::stype, return_value_policy<reference_existing_object>())
        .staticmethod("stype")
        .def(init<LineData>());

    class_<LineImp, bases<AbstractLineImp>>("Line", init<Coordinate, Coordinate>())
        .def("stype", &LineImp::stype, return_value_policy<reference_existing_object>())
        .staticmethod("stype")
        .def(init<LineData>());

    class_<ConicCartesianData>("ConicCartesianData", init<double, double, double, double, double, double>())
        .def(init<ConicPolarData>())
        .def("invalidData", &ConicCartesianData::invalidData)
        .staticmethod("invalidData")
        .def("valid", &ConicCartesianData::valid)
        //    .def( init<double[6]>() )
        //    .def_readwrite( "coeffs", &ConicCartesianData::coeffs )
        ;

    class_<ConicPolarData>("ConicPolarData", init<Coordinate, double, double, double>())
        .def(init<ConicCartesianData>())
        .def_readwrite("focus1", &ConicPolarData::focus1)
        .def_readwrite("pdimen", &ConicPolarData::pdimen)
        .def_readwrite("ecostheta0", &ConicPolarData::ecostheta0)
        .def_readwrite("esintheta0", &ConicPolarData::esintheta0);

    class_<ConicImp, bases<CurveImp>, boost::noncopyable>("Conic", no_init)
        .def("stype", &ConicImp::stype, return_value_policy<reference_existing_object>())
        .staticmethod("stype")
        .def("conicType", &ConicImp::conicType)
        //    .def( "conicTypeString", &ConicImp::conicTypeString )
        //    .def( "cartesianEquationString", &ConicImp::cartesianEquationString )
        //    .def( "polarEquationString", &ConicImp::polarEquationString )
        .def("cartesianData", &ConicImp::cartesianData)
        .def("polarData", &ConicImp::polarData)
        .def("focus1", &ConicImp::focus1)
        .def("focus2", &ConicImp::focus2);

    class_<ConicImpCart, bases<ConicImp>>("CartesianConic", init<ConicCartesianData>());
    class_<ConicImpPolar, bases<ConicImp>>("PolarConic", init<ConicPolarData>());

    class_<CircleImp, bases<ConicImp>>("Circle", init<Coordinate, double>())
        .def("stype", &CircleImp::stype, return_value_policy<reference_existing_object>())
        .staticmethod("stype")
        .def("center", &CircleImp::center)
        .def("radius", &CircleImp::radius)
        .def("squareRadius", &CircleImp::squareRadius)
        .def("surface", &CircleImp::surface)
        .def("circumference", &CircleImp::circumference);

    class_<FilledPolygonImp, bases<ObjectImp>, boost::noncopyable>("Polygon", no_init)
        .def("stype", &FilledPolygonImp::stype, return_value_policy<reference_existing_object>())
        .staticmethod("stype")
        .def("npoints", &FilledPolygonImp::npoints)
        .def("perimeter", &FilledPolygonImp::cperimeter)
        .def("area", &FilledPolygonImp::area)
        .def("windingNumber", &FilledPolygonImp::windingNumber);

    class_<VectorImp, bases<CurveImp>>("Vector", init<Coordinate, Coordinate>())
        .def("stype", &VectorImp::stype, return_value_policy<reference_existing_object>())
        .staticmethod("stype")
        .def("length", &VectorImp::length)
        .def("dir", &VectorImp::dir)
        .def("data", &VectorImp::data);

    // TODO find how to mark default
    class_<AngleImp, bases<ObjectImp>>("Angle", init<Coordinate, double, double, bool>())
        .def("stype", &AngleImp::stype, return_value_policy<reference_existing_object>())
        .staticmethod("stype")
        .def("size", &AngleImp::size)
        .def("point", &AngleImp::point)
        .def("startAngle", &AngleImp::startAngle)
        .def("angle", &AngleImp::angle);

    class_<ArcImp, bases<ObjectImp>>("Arc", init<Coordinate, double, double, double>())
        .def("stype", &ArcImp::stype, return_value_policy<reference_existing_object>())
        .staticmethod("stype")
        .def("startAngle", &ArcImp::startAngle)
        .def("angle", &ArcImp::angle)
        .def("radius", &ArcImp::radius)
        .def("center", &ArcImp::center)
        .def("firstEndPoint", &ArcImp::firstEndPoint)
        .def("secondEndPoint", &ArcImp::secondEndPoint)
        .def("sectorSurface", &ArcImp::sectorSurface);

    class_<BogusImp, bases<ObjectImp>, boost::noncopyable>("BogusObject", no_init)
        .def("stype", &BogusImp::stype, return_value_policy<reference_existing_object>())
        .staticmethod("stype");

    class_<InvalidImp, bases<BogusImp>>("InvalidObject", init<>())
        .def("stype", &InvalidImp::stype, return_value_policy<reference_existing_object>())
        .staticmethod("stype");

    class_<DoubleImp, bases<BogusImp>>("DoubleObject", init<double>())
        .def("stype", &DoubleImp::stype, return_value_policy<reference_existing_object>())
        .staticmethod("stype")
        .def("data", &DoubleImp::data)
        .def("setData", &DoubleImp::setData);

    class_<IntImp, bases<BogusImp>>("IntObject", init<int>())
        .def("stype", &IntImp::stype, return_value_policy<reference_existing_object>())
        .staticmethod("stype")
        .def("data", &IntImp::data)
        .def("setData", &IntImp::setData);

    class_<StringImp, bases<BogusImp>>("StringObject", init<char *>())
        .def("stype", &StringImp::stype, return_value_policy<reference_existing_object>())
        .staticmethod("stype")
        //     .def( "data", &StringImp::data )
        //     .def( "setData", &StringImp::setData )
        ;

    class_<TestResultImp, bases<BogusImp>>("TestResultObject", no_init)
        .def("stype", &TestResultImp::stype, return_value_policy<reference_existing_object>())
        .staticmethod("stype")
        //     .def( "data", &TestResultImp::data )
        ;

    //  class_<TextImp, bases<ObjectImp> >( "Text", init<string, Coordinate, bool>() )
    //    .def( "stype", &TextImp::stype,
    //          return_value_policy<reference_existing_object>() )
    //    .staticmethod( "stype" )
    //    .def( "text", &TextImp::text )
    //    .def( "coordinate", &TextImp::coordinate )
    //    .def( "hasFrame", &TextImp::hasFrame )
    //    ;

    class_<NumericTextImp, bases<ObjectImp>>("NumericObject", no_init)
        .def("stype", &NumericTextImp::stype, return_value_policy<reference_existing_object>())
        .staticmethod("stype")
        .def("value", &NumericTextImp::getValue);

    class_<BoolTextImp, bases<ObjectImp>>("BooleanObject", no_init)
        .def("stype", &BoolTextImp::stype, return_value_policy<reference_existing_object>())
        .staticmethod("stype")
        .def("value", &BoolTextImp::getValue);

    class_<CubicCartesianData>("CubicCartesianData", init<double, double, double, double, double, double, double, double, double, double>())
        .def("invalidData", &CubicCartesianData::invalidData)
        .staticmethod("invalidData")
        .def("valid", &CubicCartesianData::valid)
        //    .def( init<double[10]>() )
        //    .def_readwrite( "coeffs", &CubicCartesianData::coeffs )
        ;

    class_<CubicImp, bases<CurveImp>>("Cubic", init<CubicCartesianData>())
        .def("stype", &CubicImp::stype, return_value_policy<reference_existing_object>())
        .staticmethod("stype")
        .def("data", &CubicImp::data);
}

// helper class to initialize Python in a constructor;
// this way, PythonScripter::Private inherits from it and thus
// already has Python initialized before the class members
// (like 'mainnamespace') are initialized
class PythonInitializer
{
public:
    PythonInitializer();
};

PythonInitializer::PythonInitializer()
{
    // tell the python interpreter about our API..

    PyImport_AppendInittab("kig", PyInit_kig);

    Py_Initialize();

    PyRun_SimpleString("import math; from math import *;");
    PyRun_SimpleString("import kig; from kig import *;");
    PyRun_SimpleString("import traceback;");
}

PythonScripter *PythonScripter::instance()
{
    static PythonScripter t;
    return &t;
}

class PythonScripter::Private : private PythonInitializer
{
public:
    dict mainnamespace;
};

PythonScripter::PythonScripter()
{
    d = new Private;

    // find the main namespace..

    handle<> main_module(borrowed(PyImport_AddModule("__main__")));

    handle<> mnh(borrowed(PyModule_GetDict(main_module.get())));
    d->mainnamespace = extract<dict>(mnh.get());
}

PythonScripter::~PythonScripter()
{
    PyErr_Clear();
    delete d;
    // Py_FinalizeEx();
    Py_Finalize(); // maintained for compatibility reasons with python2
}

class CompiledPythonScript::Private
{
public:
    int ref;
    object calcfunc;
    // TODO
    //  object movefunc;
};

ObjectImp *CompiledPythonScript::calc(const Args &args, const KigDocument &)
{
    return PythonScripter::instance()->calc(*this, args);
}

CompiledPythonScript::~CompiledPythonScript()
{
    --d->ref;
    if (d->ref == 0)
        delete d;
}

CompiledPythonScript::CompiledPythonScript(Private *ind)
    : d(ind)
{
    ++d->ref;
}

CompiledPythonScript PythonScripter::compile(const char *code)
{
    clearErrors();
    dict retdict;
    bool error = false;
    try {
        (void)PyRun_String(const_cast<char *>(code), Py_file_input, d->mainnamespace.ptr(), retdict.ptr());
    } catch (...) {
        error = true;
    };
    error |= static_cast<bool>(PyErr_Occurred());
    if (error) {
        saveErrors();
        retdict.clear();
    }

    // debugging stuff, removed.
    //  std::string dictstring = extract<std::string>( str( retdict ) );

    CompiledPythonScript::Private *ret = new CompiledPythonScript::Private;
    ret->ref = 0;
    ret->calcfunc = retdict.get("calc");
    return CompiledPythonScript(ret);
}

CompiledPythonScript::CompiledPythonScript(const CompiledPythonScript &s)
    : d(s.d)
{
    ++d->ref;
}

std::string PythonScripter::lastErrorExceptionType() const
{
    return lastexceptiontype;
}

std::string PythonScripter::lastErrorExceptionValue() const
{
    return lastexceptionvalue;
}

std::string PythonScripter::lastErrorExceptionTraceback() const
{
    return lastexceptiontraceback;
}

ObjectImp *PythonScripter::calc(CompiledPythonScript &script, const Args &args)
{
    clearErrors();
    object calcfunc = script.d->calcfunc;
    try {
        std::vector<object> objectvect;
        objectvect.reserve(args.size());

        for (int i = 0; i < (int)args.size(); ++i) {
            object o(boost::ref(*args[i]));
            objectvect.push_back(o);
        }

        handle<> argstuph(PyTuple_New(args.size()));
        for (int i = 0; i < (int)objectvect.size(); ++i) {
            /*
             * this fixes bug https://bugs.kde.org/show_bug.cgi?id=401512
             *
             * it isn't completely clear whether we need XINCREF (test for null pointer)
             * instead of INCREF.  However I think that the arguments should never be
             * null pointers
             *    mp
             */
            Py_INCREF((objectvect.begin() + i)->ptr());
            PyTuple_SetItem(argstuph.get(), i, (objectvect.begin() + i)->ptr());
        };
        tuple argstup(argstuph);

        handle<> reth(PyObject_CallObject(calcfunc.ptr(), argstup.ptr()));
        //    object resulto = calcfunc( argstup );
        //    handle<> reth( PyObject_CallObject( calcfunc.ptr(), args ) );
        object resulto(reth);

        extract<ObjectImp &> result(resulto);
        if (!result.check())
            return new InvalidImp;
        else {
            ObjectImp &ret = result();
            return ret.copy();
        };
    } catch (...) {
        saveErrors();

        return new InvalidImp;
    };
}

void PythonScripter::saveErrors()
{
    erroroccurred = true;
    PyObject *poexctype;
    PyObject *poexcvalue;
    PyObject *poexctraceback;
    PyErr_Fetch(&poexctype, &poexcvalue, &poexctraceback);
    PyErr_NormalizeException(&poexctype, &poexcvalue, &poexctraceback);
    handle<> exctypeh(poexctype);
    handle<> excvalueh(poexcvalue);

    object exctype(exctypeh);
    object excvalue(excvalueh);
    object exctraceback;
    if (poexctraceback) {
        handle<> exctracebackh(poexctraceback);
        exctraceback = object(exctracebackh);
    }

    lastexceptiontype = extract<std::string>(str(exctype))();
    lastexceptionvalue = extract<std::string>(str(excvalue))();

    object printexcfunc = d->mainnamespace["traceback"].attr("format_exception");

    list tracebacklist = extract<list>(printexcfunc(exctype, excvalue, exctraceback))();
    str tracebackstr("");
    while (true) {
        try {
            str s = extract<str>(tracebacklist.pop());
            tracebackstr += s;
        } catch (...) {
            break;
        }
    }

    lastexceptiontraceback = extract<std::string>(tracebackstr)();
    PyErr_Clear();
}

void PythonScripter::clearErrors()
{
    PyErr_Clear();
    lastexceptiontype.clear();
    lastexceptionvalue.clear();
    lastexceptiontraceback.clear();
    erroroccurred = false;
}

bool CompiledPythonScript::valid()
{
    return !!d->calcfunc;
}

bool PythonScripter::errorOccurred() const
{
    return erroroccurred;
}
