add_subdirectory(gtest)

set(TEST_MAIN_SRC test-main.cc gtest-extra.cc gtest-extra.h util.cc)
add_library(test-main STATIC ${TEST_MAIN_SRC})
target_include_directories(test-main PUBLIC
  $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>)
target_link_libraries(test-main gtest)

include(CheckCXXCompilerFlag)

# Workaround GTest bug https://github.com/google/googletest/issues/705.
check_cxx_compiler_flag(
  -fno-delete-null-pointer-checks HAVE_FNO_DELETE_NULL_POINTER_CHECKS)
if (HAVE_FNO_DELETE_NULL_POINTER_CHECKS)
  target_compile_options(test-main PUBLIC -fno-delete-null-pointer-checks)
endif ()

# Use less strict pedantic flags for the tests because GMock doesn't compile
# cleanly with -pedantic and -std=c++98.
if (CMAKE_COMPILER_IS_GNUCXX OR (CMAKE_CXX_COMPILER_ID MATCHES "Clang"))
    #set(PEDANTIC_COMPILE_FLAGS -Wall -Wextra -Wno-long-long -Wno-variadic-macros)
endif ()

function(add_fmt_executable name)
  add_executable(${name} ${ARGN})
  if (MINGW)
    target_link_libraries(${name} -static-libgcc -static-libstdc++)
  endif ()
endfunction()

# Adds a test.
# Usage: add_fmt_test(name srcs...)
function(add_fmt_test name)
  cmake_parse_arguments(ADD_FMT_TEST "HEADER_ONLY;MODULE" "" "" ${ARGN})

  set(sources ${name}.cc ${ADD_FMT_TEST_UNPARSED_ARGUMENTS})
  if (ADD_FMT_TEST_HEADER_ONLY)
    set(sources ${sources} ${TEST_MAIN_SRC} ../src/os.cc)
    set(libs gtest fmt-header-only)
    if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
      set(PEDANTIC_COMPILE_FLAGS ${PEDANTIC_COMPILE_FLAGS} -Wno-weak-vtables)
    endif ()
  elseif (ADD_FMT_TEST_MODULE)
    set(libs test-main test-module)
    set_source_files_properties(${name}.cc PROPERTIES OBJECT_DEPENDS test-module)
  else ()
    set(libs test-main fmt)
  endif ()
  add_fmt_executable(${name} ${sources})
  target_link_libraries(${name} ${libs})

  # Define if certain C++ features can be used.
  if (FMT_PEDANTIC)
    target_compile_options(${name} PRIVATE ${PEDANTIC_COMPILE_FLAGS})
  endif ()
  if (FMT_WERROR)
    target_compile_options(${name} PRIVATE ${WERROR_FLAG})
  endif ()
  add_test(NAME ${name} COMMAND ${name})
endfunction()

add_fmt_test(args-test)
add_fmt_test(assert-test)
add_fmt_test(chrono-test)
add_fmt_test(color-test)
add_fmt_test(core-test)
add_fmt_test(gtest-extra-test)
add_fmt_test(format-test mock-allocator.h)
if (MSVC)
  target_compile_options(format-test PRIVATE /bigobj)
endif ()
if (NOT (MSVC AND BUILD_SHARED_LIBS))
  add_fmt_test(format-impl-test HEADER_ONLY header-only-test.cc)
endif ()
add_fmt_test(ostream-test)
add_fmt_test(compile-test)
add_fmt_test(printf-test)
add_fmt_test(ranges-test)
add_fmt_test(scan-test)
add_fmt_test(wchar-test)

if (FMT_CAN_MODULE)
  # The tests need {fmt} to be compiled as traditional library
  # because of visibility of implementation details.
  # If module support is present the module tests require a
  # test-only module to be built from {fmt}
  add_library(test-module OBJECT ${CMAKE_SOURCE_DIR}/src/fmt.cc)
  target_compile_features(test-module PUBLIC ${FMT_REQUIRED_FEATURES})
  target_include_directories(test-module PUBLIC
    $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>)
  enable_module(test-module)

  add_fmt_test(module-test MODULE)
endif ()

if (NOT MSVC)
  # FMT_ENFORCE_COMPILE_STRING is not supported under MSVC due to compiler bugs.
  add_fmt_test(enforce-checks-test)
  target_compile_definitions(enforce-checks-test PRIVATE
                             -DFMT_ENFORCE_COMPILE_STRING)
endif ()

if (NOT DEFINED MSVC_STATIC_RUNTIME AND MSVC)
  foreach (flag_var
			 CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE
			 CMAKE_CXX_FLAGS_MINSIZEREL CMAKE_CXX_FLAGS_RELWITHDEBINFO)
	if (${flag_var} MATCHES "^(/|-)(MT|MTd)")
	  set(MSVC_STATIC_RUNTIME ON)
	  break()
	endif()
  endforeach()
endif()

if (NOT MSVC_STATIC_RUNTIME)
  add_fmt_executable(posix-mock-test
    posix-mock-test.cc ../src/format.cc ${TEST_MAIN_SRC})
  target_include_directories(
    posix-mock-test PRIVATE ${PROJECT_SOURCE_DIR}/include)
  target_link_libraries(posix-mock-test gtest)
  if (FMT_PEDANTIC)
    target_compile_options(posix-mock-test PRIVATE ${PEDANTIC_COMPILE_FLAGS})
  endif ()
  if (HAVE_STRTOD_L)
    target_compile_definitions(posix-mock-test PRIVATE FMT_LOCALE)
  endif ()
  add_test(NAME posix-mock-test COMMAND posix-mock-test)
  add_fmt_test(os-test)
endif ()

message(STATUS "FMT_PEDANTIC: ${FMT_PEDANTIC}")

if (FMT_PEDANTIC AND CXX_STANDARD LESS 20)
  # MSVC fails to compile GMock when C++17 is enabled.
  if (FMT_HAS_VARIANT AND NOT MSVC)
    add_fmt_test(std-format-test)
    set_property(TARGET std-format-test PROPERTY CXX_STANDARD 17)
  endif ()

  # Test that the library can be compiled with exceptions disabled.
  # -fno-exception is broken in icc: https://github.com/fmtlib/fmt/issues/822.
  if (NOT CMAKE_CXX_COMPILER_ID STREQUAL "Intel")
    check_cxx_compiler_flag(-fno-exceptions HAVE_FNO_EXCEPTIONS_FLAG)
  endif ()
  if (HAVE_FNO_EXCEPTIONS_FLAG)
    add_library(noexception-test ../src/format.cc)
    target_include_directories(
      noexception-test PRIVATE ${PROJECT_SOURCE_DIR}/include)
    target_compile_options(noexception-test PRIVATE -fno-exceptions)
    if (FMT_PEDANTIC)
      target_compile_options(noexception-test PRIVATE ${PEDANTIC_COMPILE_FLAGS})
    endif ()
  endif ()

  # Test that the library compiles without locale.
  add_library(nolocale-test ../src/format.cc)
  target_include_directories(
    nolocale-test PRIVATE ${PROJECT_SOURCE_DIR}/include)
  target_compile_definitions(
    nolocale-test PRIVATE FMT_STATIC_THOUSANDS_SEPARATOR=1)

  add_test(compile-error-test ${CMAKE_CTEST_COMMAND}
    --build-and-test
    "${CMAKE_CURRENT_SOURCE_DIR}/compile-error-test"
    "${CMAKE_CURRENT_BINARY_DIR}/compile-error-test"
    --build-generator ${CMAKE_GENERATOR}
    --build-makeprogram ${CMAKE_MAKE_PROGRAM}
    --build-options
    "-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}"
    "-DCMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD}"
    "-DCXX_STANDARD_FLAG=${CXX_STANDARD_FLAG}"
    "-DPEDANTIC_COMPILE_FLAGS=${PEDANTIC_COMPILE_FLAGS}"
    "-DSUPPORTS_USER_DEFINED_LITERALS=${SUPPORTS_USER_DEFINED_LITERALS}")
endif ()

# These tests are disabled on Windows because they take too long.
if (FMT_PEDANTIC AND NOT WIN32)
  # Test if the targets are found from the build directory.
  add_test(find-package-test ${CMAKE_CTEST_COMMAND}
    -C ${CMAKE_BUILD_TYPE}
    --build-and-test
    "${CMAKE_CURRENT_SOURCE_DIR}/find-package-test"
    "${CMAKE_CURRENT_BINARY_DIR}/find-package-test"
    --build-generator ${CMAKE_GENERATOR}
    --build-makeprogram ${CMAKE_MAKE_PROGRAM}
    --build-options
    "-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}"
    "-DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}"
    "-DCMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD}"
    "-DFMT_DIR=${PROJECT_BINARY_DIR}"
    "-DPEDANTIC_COMPILE_FLAGS=${PEDANTIC_COMPILE_FLAGS}"
    "-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}")

  # Test if the targets are found when add_subdirectory is used.
  add_test(add-subdirectory-test ${CMAKE_CTEST_COMMAND}
    -C ${CMAKE_BUILD_TYPE}
    --build-and-test
    "${CMAKE_CURRENT_SOURCE_DIR}/add-subdirectory-test"
    "${CMAKE_CURRENT_BINARY_DIR}/add-subdirectory-test"
    --build-generator ${CMAKE_GENERATOR}
    --build-makeprogram ${CMAKE_MAKE_PROGRAM}
    --build-options
    "-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}"
    "-DCMAKE_CXX_STANDARD=${CMAKE_CXX_STANDARD}"
    "-DPEDANTIC_COMPILE_FLAGS=${PEDANTIC_COMPILE_FLAGS}"
    "-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}")
endif ()

# Activate optional CUDA tests if CUDA is found. For version selection see
# https://docs.nvidia.com/cuda/cuda-c-programming-guide/index.html#cpp14-language-features
if (FMT_CUDA_TEST)
  if (${CMAKE_VERSION} VERSION_LESS 3.15)
    find_package(CUDA 9.0)
  else ()
    include(CheckLanguage)
    check_language(CUDA)
    if (CMAKE_CUDA_COMPILER)
      enable_language(CUDA OPTIONAL)
      set(CUDA_FOUND TRUE)
    endif ()
  endif ()

  if (CUDA_FOUND)
    add_subdirectory(cuda-test)
    add_test(NAME cuda-test COMMAND fmt-in-cuda-test)
  endif ()
endif ()