# ******************************************************************************
# Copyright 2017-2019 Intel Corporation
#
# 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.
# ******************************************************************************

# Enable ExternalProject CMake module
include(ExternalProject)

#------------------------------------------------------------------------------
# Download and install Google Protobuf ...
#------------------------------------------------------------------------------

# This version of PROTOBUF is required by Microsoft ONNX Runtime.
set(NGRAPH_PROTOBUF_GIT_REPO_URL "https://github.com/protocolbuffers/protobuf")
set(NGRAPH_PROTOBUF_GIT_TAG "v3.5.2")

if (WIN32)
    ExternalProject_Add(
        ext_protobuf
        PREFIX protobuf
        GIT_REPOSITORY ${NGRAPH_PROTOBUF_GIT_REPO_URL}
        GIT_TAG ${NGRAPH_PROTOBUF_GIT_TAG}
        UPDATE_COMMAND ""
        PATCH_COMMAND ""
        CMAKE_GENERATOR ${CMAKE_GENERATOR}
        CMAKE_GENERATOR_PLATFORM ${CMAKE_GENERATOR_PLATFORM}
        CMAKE_GENERATOR_TOOLSET ${CMAKE_GENERATOR_TOOLSET}
        CMAKE_ARGS
            ${NGRAPH_FORWARD_CMAKE_ARGS}
            -Dprotobuf_MSVC_STATIC_RUNTIME=OFF
            -Dprotobuf_WITH_ZLIB=OFF
            -Dprotobuf_BUILD_TESTS=OFF
            -DCMAKE_INSTALL_PREFIX=${EXTERNAL_PROJECTS_ROOT}/protobuf
        TMP_DIR "${EXTERNAL_PROJECTS_ROOT}/protobuf/tmp"
        STAMP_DIR "${EXTERNAL_PROJECTS_ROOT}/protobuf/stamp"
        DOWNLOAD_DIR "${EXTERNAL_PROJECTS_ROOT}/protobuf/download"
        SOURCE_DIR "${EXTERNAL_PROJECTS_ROOT}/protobuf/src"
        SOURCE_SUBDIR "cmake"
        BINARY_DIR "${EXTERNAL_PROJECTS_ROOT}/protobuf/build"
        INSTALL_DIR "${EXTERNAL_PROJECTS_ROOT}/protobuf"
        EXCLUDE_FROM_ALL TRUE
    )
elseif (APPLE)
    # Don't manually set compiler on macos since it causes compile error on macos >= 10.14
    ExternalProject_Add(
        ext_protobuf
        PREFIX protobuf
        GIT_REPOSITORY ${NGRAPH_PROTOBUF_GIT_REPO_URL}
        GIT_TAG ${NGRAPH_PROTOBUF_GIT_TAG}
        UPDATE_COMMAND ""
        PATCH_COMMAND ""
        CONFIGURE_COMMAND ./autogen.sh COMMAND ./configure --prefix=${EXTERNAL_PROJECTS_ROOT}/protobuf --disable-shared CXXFLAGS=-fPIC
        TMP_DIR "${EXTERNAL_PROJECTS_ROOT}/protobuf/tmp"
        STAMP_DIR "${EXTERNAL_PROJECTS_ROOT}/protobuf/stamp"
        DOWNLOAD_DIR "${EXTERNAL_PROJECTS_ROOT}/protobuf/download"
        SOURCE_DIR "${EXTERNAL_PROJECTS_ROOT}/protobuf/src"
        BINARY_DIR "${EXTERNAL_PROJECTS_ROOT}/protobuf/src"
        INSTALL_DIR "${EXTERNAL_PROJECTS_ROOT}/protobuf"
        EXCLUDE_FROM_ALL TRUE
        )
else()
    ExternalProject_Add(
        ext_protobuf
        PREFIX protobuf
        GIT_REPOSITORY ${NGRAPH_PROTOBUF_GIT_REPO_URL}
        GIT_TAG ${NGRAPH_PROTOBUF_GIT_TAG}
        UPDATE_COMMAND ""
        PATCH_COMMAND ""
        CONFIGURE_COMMAND ./autogen.sh COMMAND ./configure --prefix=${EXTERNAL_PROJECTS_ROOT}/protobuf --disable-shared CXX=${CMAKE_CXX_COMPILER} CXXFLAGS=-fPIC
        TMP_DIR "${EXTERNAL_PROJECTS_ROOT}/protobuf/tmp"
        STAMP_DIR "${EXTERNAL_PROJECTS_ROOT}/protobuf/stamp"
        DOWNLOAD_DIR "${EXTERNAL_PROJECTS_ROOT}/protobuf/download"
        SOURCE_DIR "${EXTERNAL_PROJECTS_ROOT}/protobuf/src"
        BINARY_DIR "${EXTERNAL_PROJECTS_ROOT}/protobuf/src"
        INSTALL_DIR "${EXTERNAL_PROJECTS_ROOT}/protobuf"
        EXCLUDE_FROM_ALL TRUE
        )
endif()

# -----------------------------------------------------------------------------
# Use the interface of FindProtobuf.cmake
# -----------------------------------------------------------------------------

set(Protobuf_INSTALL_PREFIX ${EXTERNAL_PROJECTS_ROOT}/protobuf)
set(Protobuf_PROTOC_EXECUTABLE ${Protobuf_INSTALL_PREFIX}/bin/protoc)
set(Protobuf_INCLUDE_DIR ${Protobuf_INSTALL_PREFIX}/include)
if (WIN32)
    set(Protobuf_LIBRARY ${Protobuf_INSTALL_PREFIX}/lib/libprotobuf.lib)
else()
    set(Protobuf_LIBRARY ${Protobuf_INSTALL_PREFIX}/lib/libprotobuf.a)
endif()
set(Protobuf_LIBRARIES ${Protobuf_LIBRARY})

if (NOT TARGET protobuf::libprotobuf)
    add_library(protobuf::libprotobuf UNKNOWN IMPORTED)
    set_target_properties(protobuf::libprotobuf PROPERTIES
        INTERFACE_INCLUDE_DIRECTORIES "${Protobuf_INCLUDE_DIR}"
        IMPORTED_LOCATION "${Protobuf_LIBRARY}")
    add_dependencies(protobuf::libprotobuf ext_protobuf)
endif()

if (NOT TARGET protobuf::protoc)
    add_executable(protobuf::protoc IMPORTED)
    set_target_properties(protobuf::protoc PROPERTIES
        IMPORTED_LOCATION "${Protobuf_PROTOC_EXECUTABLE}")
    add_dependencies(protobuf::protoc ext_protobuf)
endif()

set(Protobuf_FOUND)
set(PROTOBUF_FOUND)
