/*

    tests/test_kwargs_and_defaults.cpp -- keyword arguments and default values

    Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>

    All rights reserved. Use of this source code is governed by a

    BSD-style license that can be found in the LICENSE file.

*/

#include "pybind11_tests.h"

#include "constructor_stats.h"

#include <pybind11/stl.h>

TEST_SUBMODULE(kwargs_and_defaults, m) {

    auto kw_func = [](int x, int y) { return "x=" + std::to_string(x) + ", y=" + std::to_string(y); };

    // test_named_arguments

    m.def("kw_func0", kw_func);

    m.def("kw_func1", kw_func, py::arg("x"), py::arg("y"));

    m.def("kw_func2", kw_func, py::arg("x") = 100, py::arg("y") = 200);

    m.def("kw_func3", [](const char *) { }, py::arg("data") = std::string("Hello world!"));

    /* A fancier default argument */

    std::vector<int> list{{13, 17}};

    m.def("kw_func4", [](const std::vector<int> &entries) {

        std::string ret = "{";

        for (int i : entries)

            ret += std::to_string(i) + " ";

        ret.back() = '}';

        return ret;

    }, py::arg("myList") = list);

    m.def("kw_func_udl", kw_func, "x"_a, "y"_a=300);

    m.def("kw_func_udl_z", kw_func, "x"_a, "y"_a=0);

    // test_args_and_kwargs

    m.def("args_function", [](py::args args) -> py::tuple {

        return std::move(args);

    });

    m.def("args_kwargs_function", [](py::args args, py::kwargs kwargs) {

        return py::make_tuple(args, kwargs);

    });

    // test_mixed_args_and_kwargs

    m.def("mixed_plus_args", [](int i, double j, py::args args) {

        return py::make_tuple(i, j, args);

    });

    m.def("mixed_plus_kwargs", [](int i, double j, py::kwargs kwargs) {

        return py::make_tuple(i, j, kwargs);

    });

    auto mixed_plus_both = [](int i, double j, py::args args, py::kwargs kwargs) {

        return py::make_tuple(i, j, args, kwargs);

    };

    m.def("mixed_plus_args_kwargs", mixed_plus_both);

    m.def("mixed_plus_args_kwargs_defaults", mixed_plus_both,

            py::arg("i") = 1, py::arg("j") = 3.14159);

    // test_args_refcount

    // PyPy needs a garbage collection to get the reference count values to match CPython's behaviour

    #ifdef PYPY_VERSION

    #define GC_IF_NEEDED ConstructorStats::gc()

    #else

    #define GC_IF_NEEDED

    #endif

    m.def("arg_refcount_h", [](py::handle h) { GC_IF_NEEDED; return h.ref_count(); });

    m.def("arg_refcount_h", [](py::handle h, py::handle, py::handle) { GC_IF_NEEDED; return h.ref_count(); });

    m.def("arg_refcount_o", [](py::object o) { GC_IF_NEEDED; return o.ref_count(); });

    m.def("args_refcount", [](py::args a) {

        GC_IF_NEEDED;

        py::tuple t(a.size());

        for (size_t i = 0; i < a.size(); i++)

            // Use raw Python API here to avoid an extra, intermediate incref on the tuple item:

            t[i] = (int) Py_REFCNT(PyTuple_GET_ITEM(a.ptr(), static_cast<ssize_t>(i)));

        return t;

    });

    m.def("mixed_args_refcount", [](py::object o, py::args a) {

        GC_IF_NEEDED;

        py::tuple t(a.size() + 1);

        t[0] = o.ref_count();

        for (size_t i = 0; i < a.size(); i++)

            // Use raw Python API here to avoid an extra, intermediate incref on the tuple item:

            t[i + 1] = (int) Py_REFCNT(PyTuple_GET_ITEM(a.ptr(), static_cast<ssize_t>(i)));

        return t;

    });

    // pybind11 won't allow these to be bound: args and kwargs, if present, must be at the end.

    // Uncomment these to test that the static_assert is indeed working:

//    m.def("bad_args1", [](py::args, int) {});

//    m.def("bad_args2", [](py::kwargs, int) {});

//    m.def("bad_args3", [](py::kwargs, py::args) {});

//    m.def("bad_args4", [](py::args, int, py::kwargs) {});

//    m.def("bad_args5", [](py::args, py::kwargs, int) {});

//    m.def("bad_args6", [](py::args, py::args) {});

//    m.def("bad_args7", [](py::kwargs, py::kwargs) {});

    // test_function_signatures (along with most of the above)

    struct KWClass { void foo(int, float) {} };

    py::class_<KWClass>(m, "KWClass")

        .def("foo0", &KWClass::foo)

        .def("foo1", &KWClass::foo, "x"_a, "y"_a);

}