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// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

// https://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

#ifndef THIRD_PARTY_CEL_PYTHON_PY_CEL_FUNCTION_H_

#define THIRD_PARTY_CEL_PYTHON_PY_CEL_FUNCTION_H_

#include <Python.h> // IWYU pragma: keep - Needed for PyObject

#include <string>

#include <vector>

#include "absl/status/statusor.h"

#include "absl/types/span.h"

#include "common/value.h"

#include "runtime/function.h"

#include "cel_expr_python/py_cel_type.h"

#include <pybind11/pybind11.h>

namespace cel_python {

namespace py = ::pybind11;

class PyCelEnvInternal;

// Wrapper for a Python function that implements a CEL late-bound function.

// These function implementations are supplied to Activation.

class PyCelFunction {

public:

static void DefinePythonBindings(pybind11::module& m);

PyCelFunction(std::string function_name, std::vector<PyCelType> parameters,

bool is_member, py::object impl, PyCelType return_type);

std::string function_name() const { return function_name_; }

const std::vector<PyCelType>& parameters() const { return parameters_; }

bool is_member() const { return is_member_; }

const py::object& impl() const { return impl_; }

const PyCelType& return_type() const { return return_type_; }

private:

std::string function_name_;

PyCelType return_type_;

std::vector<PyCelType> parameters_;

bool is_member_;

py::object impl_;

};

// Internal wrapper for a Python function that implements a CEL extension

// function.

class PyCelFunctionAdapter : public cel::Function {

public:

PyCelFunctionAdapter(std::string function_name, PyCelType return_type,

const py::object& py_function);

~PyCelFunctionAdapter() override;

PyCelFunctionAdapter(const PyCelFunctionAdapter&) = delete;

PyCelFunctionAdapter& operator=(const PyCelFunctionAdapter&) = delete;

absl::StatusOr<cel::Value> Invoke(

absl::Span<const cel::Value> args,

const cel::Function::InvokeContext& context) const final;

private:

std::string function_name_;

PyCelType return_type_;

PyObject* py_function_;

};

} // namespace cel_python

#endif // THIRD_PARTY_CEL_PYTHON_PY_CEL_FUNCTION_H_