set(PROJECT_NAME ${PROJECT_NAME} PARENT_SCOPE )
# GoogleTest requires at least C++14
set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

# Get GoogleTest
include(FetchContent)
FetchContent_Declare(
  googletest
  URL https://github.com/google/googletest/archive/03597a01ee50ed33e9dfd640b249b4be3799d395.zip
)
# For Windows: Prevent overriding the parent project's compiler/linker settings
set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
FetchContent_MakeAvailable(googletest)

add_subdirectory(src)
add_executable(tests ${TESTS})

# Link test executable against gtest & gtest_main
target_link_libraries(
  tests
  GTest::gtest_main
)

target_include_directories(tests PRIVATE
  ${CMAKE_SOURCE_DIR}/src
  )

# Discover tests
include(GoogleTest)
gtest_discover_tests(tests)
add_dependencies(tests ${PROJECT_NAME})

# The following section is inspired by https://github.com/cmake-modules/lcov
if(ENABLE_COVERAGE)
  message("Test coverage enabled")
  # set(exclude_dir "*/tests/*  */_deps/* /usr/include/c++/11/**/* /usr/include/c++/**/*")
  # set(exclude_dir "*/tests/* */_deps/* /usr/include/c++/11/tuple /usr/include/c++/11/**/*")

  # Check for lcov, gcov and genhtml
  find_program(GCOV gcov)
  if (NOT GCOV)
    message(WARNING "gcov not found")
  endif()
  find_program(LCOV lcov)
  if (NOT LCOV)
    message(WARNING "lcov not found")
  endif()
  find_program(GENHTML genhtml)
  if (NOT GENHTML)
    message(WARNING "genhtml not found")
  endif()

  if (GCOV AND LCOV AND GENHTML)
    # Set C compiler flags
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} --coverage -fprofile-arcs -ftest-coverage")
    # Set C++ compiler flags
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --coverage -fprofile-arcs -ftest-coverage")

    set(covname cov.info)
    add_custom_target(coverage DEPENDS ${covname})
    add_dependencies(coverage tests ${PROJECT_NAME})
    add_custom_command(
      OUTPUT  ${covname}
      COMMAND rm -rf **/coverage
      COMMAND ${LCOV} -c -o ${covname} -d ${CMAKE_BINARY_DIR}/tests/CMakeFiles/tests.dir/ -b . --gcov-tool ${GCOV}
      COMMAND ${LCOV} -r ${covname} -o ${covname} "*/tests/*" "*/_deps/**/*" "/usr/include/c++/**/*" "/usr/include/c++/11/**/*"
      COMMAND ${LCOV} -l ${covname}
      COMMAND ${GENHTML} ${covname} -output coverage
      COMMAND ${LCOV} -l ${covname} 2>/dev/null | grep Total | sed 's/|//g' | sed 's/Total://g' | awk '{print $1}' | sed s/%//g > coverage/total
      COMMAND rm -rf CMakeFiles/tests.dir/src/*.gcda CMakeFiles/tests.dir/src/*.gcno
      COMMAND rm -f ${covname}
    )
    set_directory_properties(PROPERTIES
      ADDITIONAL_CLEAN_FILES ${covname}
    )
    set_directory_properties(PROPERTIES
      ADDITIONAL_CLEAN_FILES coverage/
    )
  else()
    message(WARNING "Cannot enable coverage. Missing the required tools")
  endif()
endif()