/* Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
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
http://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. */

#include <Python.h>

#include <string>
#include <vector>

#include "paddle/fluid/eager/api/all.h"
#include "paddle/fluid/eager/autograd_meta.h"
#include "paddle/fluid/memory/allocation/allocator.h"
#include "paddle/fluid/platform/enforce.h"
#include "paddle/fluid/pybind/eager.h"
#include "paddle/fluid/pybind/eager_utils.h"
#include "paddle/pten/common/data_type.h"
#include "paddle/pten/core/convert_utils.h"
#include "paddle/pten/core/dense_tensor.h"
#include "paddle/pten/include/core.h"

namespace paddle {
namespace pybind {

extern PyTypeObject* p_eager_tensor_type;

extern PyTypeObject* g_place_pytype;
extern PyTypeObject* g_cudaplace_pytype;
extern PyTypeObject* g_cpuplace_pytype;
extern PyTypeObject* g_xpuplace_pytype;
extern PyTypeObject* g_npuplace_pytype;
extern PyTypeObject* g_cudapinnedplace_pytype;

bool PyObject_CheckLongOrConvertToLong(PyObject** obj) {
  if ((PyLong_Check(*obj) && !PyBool_Check(*obj))) {
    return true;
  }

  if (std::string((reinterpret_cast<PyTypeObject*>((*obj)->ob_type))->tp_name)
          .find("numpy") != std::string::npos) {
    auto to = PyNumber_Long(*obj);
    if (to) {
      *obj = to;
      return true;
    }
  }

  return false;
}

bool PyObject_CheckFloatOrConvertToFloat(PyObject** obj) {
  // sometimes users provide PyLong or numpy.int64 but attr is float
  if (PyFloat_Check(*obj) || PyLong_Check(*obj)) {
    return true;
  }
  if (std::string((reinterpret_cast<PyTypeObject*>((*obj)->ob_type))->tp_name)
          .find("numpy") != std::string::npos) {
    auto to = PyNumber_Float(*obj);
    if (to) {
      *obj = to;
      return true;
    }
  }
  return false;
}

bool PyObject_CheckStr(PyObject* obj) { return PyUnicode_Check(obj); }

bool CastPyArg2AttrBoolean(PyObject* obj, ssize_t arg_pos) {
  if (obj == Py_None) {
    return false;  // To be compatible with QA integration testing. Some
                   // test case pass in None.
  } else if (obj == Py_True) {
    return true;
  } else if (obj == Py_False) {
    return false;
  } else {
    PADDLE_THROW(platform::errors::InvalidArgument(
        "argument (position %d) must be "
        "bool, but got %s",
        arg_pos + 1, (reinterpret_cast<PyTypeObject*>(obj->ob_type))->tp_name));
  }
}

int CastPyArg2AttrInt(PyObject* obj, ssize_t arg_pos) {
  if (PyObject_CheckLongOrConvertToLong(&obj)) {
    return static_cast<int>(PyLong_AsLong(obj));
  } else {
    PADDLE_THROW(platform::errors::InvalidArgument(
        "argument (position %d) must be "
        "int, but got %s",
        arg_pos + 1, (reinterpret_cast<PyTypeObject*>(obj->ob_type))->tp_name));
  }
}

int64_t CastPyArg2AttrLong(PyObject* obj, ssize_t arg_pos) {
  if (PyObject_CheckLongOrConvertToLong(&obj)) {
    return (int64_t)PyLong_AsLong(obj);  // NOLINT
  } else {
    PADDLE_THROW(platform::errors::InvalidArgument(
        "argument (position %d) must be "
        "long, but got %s",
        arg_pos + 1, (reinterpret_cast<PyTypeObject*>(obj->ob_type))->tp_name));
  }
}

float CastPyArg2AttrFloat(PyObject* obj, ssize_t arg_pos) {
  if (PyObject_CheckFloatOrConvertToFloat(&obj)) {
    return static_cast<float>(PyFloat_AsDouble(obj));
  } else {
    PADDLE_THROW(platform::errors::InvalidArgument(
        "argument (position %d) must be "
        "float, but got %s",
        arg_pos + 1, (reinterpret_cast<PyTypeObject*>(obj->ob_type))->tp_name));
  }
}

std::string CastPyArg2AttrString(PyObject* obj, ssize_t arg_pos) {
  if (PyObject_CheckStr(obj)) {
    Py_ssize_t size;
    const char* data;
    data = PyUnicode_AsUTF8AndSize(obj, &size);
    return std::string(data, static_cast<size_t>(size));
  } else {
    PADDLE_THROW(platform::errors::InvalidArgument(
        "argument (position %d) must be "
        "str, but got %s",
        arg_pos + 1, (reinterpret_cast<PyTypeObject*>(obj->ob_type))->tp_name));
    return "";
  }
}

egr::EagerTensor CastPyArg2EagerTensor(PyObject* obj, ssize_t arg_pos) {
  if (PyObject_IsInstance(obj,
                          reinterpret_cast<PyObject*>(p_eager_tensor_type))) {
    return reinterpret_cast<EagerTensorObject*>(obj)->eagertensor;
  } else {
    PADDLE_THROW(platform::errors::InvalidArgument(
        "argument (position %d) must be "
        "EagerTensor, but got %s",
        arg_pos + 1, reinterpret_cast<PyTypeObject*>(obj->ob_type)->tp_name));
  }
}

std::vector<egr::EagerTensor> CastPyArg2VectorOfEagerTensor(PyObject* obj,
                                                            ssize_t arg_pos) {
  std::vector<egr::EagerTensor> result;
  if (PyList_Check(obj)) {
    Py_ssize_t len = PyList_Size(obj);
    PyObject* item = nullptr;
    for (Py_ssize_t i = 0; i < len; i++) {
      item = PyList_GetItem(obj, i);
      if (PyObject_IsInstance(
              item, reinterpret_cast<PyObject*>(p_eager_tensor_type))) {
        result.emplace_back(
            reinterpret_cast<EagerTensorObject*>(item)->eagertensor);
      } else {
        PADDLE_THROW(platform::errors::InvalidArgument(
            "argument (position %d) must be "
            "list of bool, but got %s at pos %d",
            arg_pos + 1,
            reinterpret_cast<PyTypeObject*>(item->ob_type)->tp_name, i));
      }
    }
  } else if (PyTuple_Check(obj)) {
    Py_ssize_t len = PyTuple_Size(obj);
    PyObject* item = nullptr;
    for (Py_ssize_t i = 0; i < len; i++) {
      item = PyTuple_GetItem(obj, i);
      if (PyObject_IsInstance(
              item, reinterpret_cast<PyObject*>(p_eager_tensor_type))) {
        result.emplace_back(
            reinterpret_cast<EagerTensorObject*>(item)->eagertensor);
      } else {
        PADDLE_THROW(platform::errors::InvalidArgument(
            "argument (position %d) must be "
            "list of bool, but got %s at pos %d",
            arg_pos + 1,
            reinterpret_cast<PyTypeObject*>(item->ob_type)->tp_name, i));
      }
    }
  } else {
    PADDLE_THROW(platform::errors::InvalidArgument(
        "argument (position %d) must be "
        "list or tuple, but got %s",
        arg_pos + 1, reinterpret_cast<PyTypeObject*>(obj->ob_type)->tp_name));
  }
  return result;
}

platform::Place CastPyArg2Place(PyObject* obj, ssize_t arg_pos) {
  platform::Place place;
  if (PyObject_IsInstance(obj, reinterpret_cast<PyObject*>(g_place_pytype))) {
    place = ::pybind11::handle(obj).cast<platform::Place>();
  } else if (PyObject_IsInstance(
                 obj, reinterpret_cast<PyObject*>(g_cudaplace_pytype))) {
    place = ::pybind11::handle(obj).cast<platform::CUDAPlace>();
  } else if (PyObject_IsInstance(
                 obj, reinterpret_cast<PyObject*>(g_cpuplace_pytype))) {
    place = ::pybind11::handle(obj).cast<platform::CPUPlace>();
  } else if (PyObject_IsInstance(
                 obj, reinterpret_cast<PyObject*>(g_xpuplace_pytype))) {
    place = ::pybind11::handle(obj).cast<platform::XPUPlace>();
  } else if (PyObject_IsInstance(
                 obj, reinterpret_cast<PyObject*>(g_npuplace_pytype))) {
    place = ::pybind11::handle(obj).cast<platform::NPUPlace>();
  } else if (PyObject_IsInstance(
                 obj, reinterpret_cast<PyObject*>(g_cudapinnedplace_pytype))) {
    place = ::pybind11::handle(obj).cast<platform::CUDAPinnedPlace>();
  } else {
    PADDLE_THROW(platform::errors::InvalidArgument(
        "argument (position %d) must be "
        "one of(Place,CUDAPlace,CPUPlace,XPUPlace,NPUPlace,CUDAPinnedPlace), "
        "but got %s",
        arg_pos + 1, reinterpret_cast<PyTypeObject*>(obj->ob_type)->tp_name));
  }
  return place;
}

PyObject* ToPyObject(bool value) {
  if (value) {
    Py_INCREF(Py_True);
    return Py_True;
  } else {
    Py_INCREF(Py_False);
    return Py_False;
  }
}

PyObject* ToPyObject(int value) { return PyLong_FromLong(value); }

PyObject* ToPyObject(int64_t value) { return PyLong_FromLongLong(value); }

PyObject* ToPyObject(float value) { return PyLong_FromDouble(value); }

PyObject* ToPyObject(double value) { return PyLong_FromDouble(value); }

PyObject* ToPyObject(const char* value) { return PyUnicode_FromString(value); }

PyObject* ToPyObject(const std::string& value) {
  return PyUnicode_FromString(value.c_str());
}

PyObject* ToPyObject(const egr::EagerTensor& value) {
  PyObject* obj = p_eager_tensor_type->tp_alloc(p_eager_tensor_type, 0);
  if (obj) {
    auto v = reinterpret_cast<EagerTensorObject*>(obj);
    new (&(v->eagertensor)) egr::EagerTensor();
    v->eagertensor = value;
  } else {
    PADDLE_THROW(platform::errors::Fatal(
        "tp_alloc return null, can not new a PyObject."));
  }
  return obj;
}

PyObject* ToPyObject(const std::vector<bool>& value) {
  PyObject* result = PyList_New((Py_ssize_t)value.size());

  for (size_t i = 0; i < value.size(); i++) {
    PyList_SET_ITEM(result, static_cast<Py_ssize_t>(i), ToPyObject(value[i]));
  }

  return result;
}

PyObject* ToPyObject(const std::vector<int>& value) {
  PyObject* result = PyList_New((Py_ssize_t)value.size());

  for (size_t i = 0; i < value.size(); i++) {
    PyList_SET_ITEM(result, static_cast<Py_ssize_t>(i), ToPyObject(value[i]));
  }

  return result;
}

PyObject* ToPyObject(const std::vector<int64_t>& value) {
  PyObject* result = PyList_New((Py_ssize_t)value.size());

  for (size_t i = 0; i < value.size(); i++) {
    PyList_SET_ITEM(result, (Py_ssize_t)i, ToPyObject(value[i]));
  }

  return result;
}

PyObject* ToPyObject(const std::vector<float>& value) {
  PyObject* result = PyList_New((Py_ssize_t)value.size());

  for (size_t i = 0; i < value.size(); i++) {
    PyList_SET_ITEM(result, static_cast<Py_ssize_t>(i), ToPyObject(value[i]));
  }

  return result;
}

PyObject* ToPyObject(const std::vector<double>& value) {
  PyObject* result = PyList_New((Py_ssize_t)value.size());

  for (size_t i = 0; i < value.size(); i++) {
    PyList_SET_ITEM(result, static_cast<Py_ssize_t>(i), ToPyObject(value[i]));
  }

  return result;
}

PyObject* ToPyObject(const std::vector<egr::EagerTensor>& value) {
  PyObject* result = PyList_New((Py_ssize_t)value.size());

  for (size_t i = 0; i < value.size(); i++) {
    PyObject* obj = p_eager_tensor_type->tp_alloc(p_eager_tensor_type, 0);
    if (obj) {
      auto v = reinterpret_cast<EagerTensorObject*>(obj);
      new (&(v->eagertensor)) egr::EagerTensor();
      v->eagertensor = value[i];
    } else {
      PADDLE_THROW(platform::errors::Fatal(
          "tp_alloc return null, can not new a PyObject."));
    }
    PyList_SET_ITEM(result, static_cast<Py_ssize_t>(i), obj);
  }

  return result;
}

PyObject* ToPyObject(const platform::Place& value) {
  auto obj = ::pybind11::cast(value);
  obj.inc_ref();
  return obj.ptr();
}

}  // namespace pybind
}  // namespace paddle