#!/usr/bin/cmake -P

## Copyright(c) 2020, Intel Corporation

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cmake_minimum_required (VERSION 2.8.12)

macro(opae_external_project_add)

    set(options EXCLUDE_FROM_ALL NO_ADD_SUBDIRECTORY)

    set(oneValueArgs PROJECT_NAME GIT_URL GIT_TAG PRESERVE_REPOS)

    set(multiValueArgs)

    cmake_parse_arguments(OPAE_EXTERNAL_PROJECT_ADD "${options}"

        "${oneValueArgs}" "${multiValueArgs}" ${ARGN})

    if(NOT OPAE_EXTERNAL_PROJECT_ADD_GIT_TAG)

        set(OPAE_EXTERNAL_PROJECT_ADD_GIT_TAG "master")

    endif(NOT OPAE_EXTERNAL_PROJECT_ADD_GIT_TAG)

    set(${OPAE_EXTERNAL_PROJECT_ADD_PROJECT_NAME}_ROOT

        ${CMAKE_SOURCE_DIR}/external/${OPAE_EXTERNAL_PROJECT_ADD_PROJECT_NAME}

        CACHE PATH "Root directory to ${OPAE_EXTERNAL_PROJECT_ADD_PROJECT_NAME} external" FORCE)

    set(download_dir

        ${CMAKE_CURRENT_BINARY_DIR}/${OPAE_EXTERNAL_PROJECT_ADD_PROJECT_NAME}/download)

    file(WRITE ${download_dir}/CMakeLists.txt

        "cmake_minimum_required(VERSION 2.8.12)\n"

        "include(ExternalProject)\n"

        "ExternalProject_Add(${OPAE_EXTERNAL_PROJECT_ADD_PROJECT_NAME}\n"

        "    GIT_REPOSITORY ${OPAE_EXTERNAL_PROJECT_ADD_GIT_URL}\n"

        "    GIT_TAG ${OPAE_EXTERNAL_PROJECT_ADD_GIT_TAG}\n"

        "    SOURCE_DIR ${CMAKE_SOURCE_DIR}/external/${OPAE_EXTERNAL_PROJECT_ADD_PROJECT_NAME}\n"

        "    BINARY_DIR ${CMAKE_BINARY_DIR}/external/${OPAE_EXTERNAL_PROJECT_ADD_PROJECT_NAME}\n"

        "    CONFIGURE_COMMAND \"\"\n"

        "    BUILD_COMMAND \"\"\n"

        "    INSTALL_COMMAND \"\"\n"

        "    TEST_COMMAND \"\"\n"

        "    COMMENT \"adding ${OPAE_EXTERNAL_PROJECT_ADD_PROJECT_NAME}\"\n"

        ")\n"

    )

    if(NOT EXISTS ${CMAKE_SOURCE_DIR}/external/${OPAE_EXTERNAL_PROJECT_ADD_PROJECT_NAME} OR NOT ${OPAE_EXTERNAL_PROJECT_ADD_PRESERVE_REPOS})

        execute_process(

            COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .

            RESULT_VARIABLE result

            WORKING_DIRECTORY ${download_dir})

        if(result)

            message(FATAL_ERROR "CMake step for ${OPAE_EXTERNAL_PROJECT_ADD_PROJECT_NAME} failed: ${result}")

        endif(result)

        execute_process(

            COMMAND ${CMAKE_COMMAND} --build .

            RESULT_VARIABLE result

            WORKING_DIRECTORY ${download_dir})

        if(result)

            message(FATAL_ERROR "Build step for ${OPAE_EXTERNAL_PROJECT_ADD_PROJECT_NAME} failed: ${result}")

        endif(result)

    endif()

    set(src_dir

        ${CMAKE_SOURCE_DIR}/external/${OPAE_EXTERNAL_PROJECT_ADD_PROJECT_NAME})

    set(bin_dir

        ${CMAKE_BINARY_DIR}/external/${OPAE_EXTERNAL_PROJECT_ADD_PROJECT_NAME})

    if(NOT ${OPAE_EXTERNAL_PROJECT_ADD_NO_ADD_SUBDIRECTORY} AND EXISTS ${src_dir}/CMakeLists.txt)

        if(${OPAE_EXTERNAL_PROJECT_ADD_EXCLUDE_FROM_ALL})

            add_subdirectory(${src_dir} ${bin_dir} EXCLUDE_FROM_ALL)

        else(${OPAE_EXTERNAL_PROJECT_ADD_EXCLUDE_FROM_ALL})

            add_subdirectory(${src_dir} ${bin_dir})

        endif(${OPAE_EXTERNAL_PROJECT_ADD_EXCLUDE_FROM_ALL})

    endif(NOT ${OPAE_EXTERNAL_PROJECT_ADD_NO_ADD_SUBDIRECTORY} AND EXISTS ${src_dir}/CMakeLists.txt)

endmacro(opae_external_project_add)