include(CheckCXXSourceRuns)

find_path(GTest_INCLUDE_DIR gtest/gtest.h
          NO_DEFAULT_PATH
          PATHS
          "${PROJECT_SOURCE_DIR}/../thirdparty/googletest/googletest/include"
          "/usr/local/include"
          "/usr/include")

find_path(GMock_INCLUDE_DIR gmock/gmock.h
          NO_DEFAULT_PATH
          PATHS
          "${PROJECT_SOURCE_DIR}/../thirdparty/googletest/googlemock/include"
          "/usr/local/include"
          "/usr/include")

find_library(Gtest_LIBRARY
             NAMES libgtest.a
             HINTS
             "${PROJECT_SOURCE_DIR}/../thirdparty/googletest/build/googlemock/gtest"
             "/usr/local/lib"
             "/usr/lib")

find_library(Gmock_LIBRARY
             NAMES libgmock.a
             HINTS
             "${PROJECT_SOURCE_DIR}/../thirdparty/googletest/build/googlemock"
             "/usr/local/lib"
             "/usr/lib")

message(STATUS "Find GoogleTest include path: ${GTest_INCLUDE_DIR}")
message(STATUS "Find GoogleMock include path: ${GMock_INCLUDE_DIR}")
message(STATUS "Find Gtest library path: ${Gtest_LIBRARY}")
message(STATUS "Find Gmock library path: ${Gmock_LIBRARY}")

set(CMAKE_REQUIRED_INCLUDES ${GTest_INCLUDE_DIR} ${GMock_INCLUDE_DIR})
set(CMAKE_REQUIRED_LIBRARIES ${Gtest_LIBRARY} ${Gmock_LIBRARY} -lpthread)
set(CMAKE_REQUIRED_FLAGS)
check_cxx_source_runs("
#include <gtest/gtest.h>
#include <gmock/gmock.h>
int main(int argc, char *argv[])
{
  double pi = 3.14;
  EXPECT_EQ(pi, 3.14);
  return 0;
}
" GoogleTest_CHECK_FINE)
message(STATUS "GoogleTest check: ${GoogleTest_CHECK_FINE}")

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(
    GoogleTest
    REQUIRED_VARS
    GTest_INCLUDE_DIR
    GMock_INCLUDE_DIR
    Gtest_LIBRARY
    Gmock_LIBRARY
    GoogleTest_CHECK_FINE)

set(GoogleTest_INCLUDE_DIR ${GTest_INCLUDE_DIR} ${GMock_INCLUDE_DIR})
set(GoogleTest_LIBRARIES ${Gtest_LIBRARY} ${Gmock_LIBRARY})
mark_as_advanced(
    GoogleTest_INCLUDE_DIR
    GoogleTest_LIBRARIES)