# Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
# 
# 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.

FIND_PACKAGE(NumPy)

IF(NOT ${NUMPY_FOUND})

    INCLUDE(ExternalProject)

    SET(NUMPY_SOURCES_DIR ${CMAKE_CURRENT_SOURCE_DIR}/third_party/numpy)
    SET(NUMPY_INSTALL_DIR ${PROJECT_BINARY_DIR}/numpy)
    set(NUMPY_VERSION "v1.11.3")

    ExternalProject_Add(setuptools
        PREFIX              ${PYTHON_SOURCES_DIR}/setuptools
        URL                 http://pypi.python.org/packages/source/s/setuptools/setuptools-0.6c11.tar.gz
        URL_MD5             7df2a529a074f613b509fb44feefe74e
        BUILD_IN_SOURCE     1
        UPDATE_COMMAND      ""
        PATCH_COMMAND       ""
        CONFIGURE_COMMAND   ""
        INSTALL_COMMAND     ""
        BUILD_COMMAND       ${PYTHON_EXECUTABLE} setup.py install
        DEPENDS             python zlib
    )

    ExternalProject_Add(cython
    PREFIX                ${PYTHON_SOURCES_DIR}/cython
    GIT_REPOSITORY        https://github.com/cython/cython.git
    BUILD_IN_SOURCE       1
    CONFIGURE_COMMAND     ""
    UPDATE_COMMAND        ""
    PATCH_COMMAND         ""
    INSTALL_COMMAND       ""
    BUILD_COMMAND         ${PYTHON_EXECUTABLE} setup.py install
    DEPENDS               python
    )

    ExternalProject_Add(numpy
        GIT_REPOSITORY      https://github.com/numpy/numpy.git
        GIT_TAG             ${NUMPY_VERSION}
        CONFIGURE_COMMAND   ""
        UPDATE_COMMAND      ""
        PREFIX              ${NUMPY_SOURCES_DIR}
        BUILD_COMMAND       ${PYTHON_EXECUTABLE} setup.py build
        INSTALL_COMMAND     ${PYTHON_EXECUTABLE} setup.py install
        BUILD_IN_SOURCE     1
        DEPENDS python setuptools cython
    )

    LIST(APPEND external_project_dependencies numpy)

    # find numpy include directory
    FILE(WRITE ${PROJECT_BINARY_DIR}/FindNumpyPath.py
        "try: import numpy; print(numpy.get_include())\nexcept:pass\n")

    EXEC_PROGRAM("${PYTHON_EXECUTABLE}" ${PROJECT_BINARY_DIR}
        ARGS "FindNumpyPath.py"
        OUTPUT_VARIABLE NUMPY_PATH)

    FIND_PATH(PYTHON_NUMPY_INCLUDE_DIR numpy/arrayobject.h
        HINTS "${NUMPY_PATH}" "${PYTHON_INCLUDE_PATH}")

ENDIF()

INCLUDE_DIRECTORIES(${PYTHON_NUMPY_INCLUDE_DIR})