# Returns the current subdirectory in the sources directory.
macro(GET_CURRENT_SOURCE_SUBDIRECTORY current_source_subdirectory)
    string(REGEX REPLACE ".*/([^/]*)" "\\1" REGEX_RESULT "${CMAKE_CURRENT_SOURCE_DIR}" )
    set(${current_source_subdirectory} ${REGEX_RESULT})
endmacro()

# Returns a list of source files (*.h and *.cpp) in source_files and creates a Visual
# Studio folder. A (relative) subdirectory can be passed as second parameter (optional).
macro(GET_SOURCE_FILES source_files)
    if(${ARGC} EQUAL 2)
        set(DIR "${ARGV1}")
    else()
        set(DIR ".")
    endif()

    # Get all files in the directory
    file(GLOB GET_SOURCE_FILES_HEADERS RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} CONFIGURE_DEPENDS ${DIR}/*.h)
    file(GLOB GET_SOURCE_FILES_TEMPLATES RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} CONFIGURE_DEPENDS ${DIR}/*.tpp)
    file(GLOB GET_SOURCE_FILES_SOURCES RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} CONFIGURE_DEPENDS ${DIR}/*.cpp)

    set(${source_files} ${GET_SOURCE_FILES_HEADERS} ${GET_SOURCE_FILES_TEMPLATES} ${GET_SOURCE_FILES_SOURCES})
    list(LENGTH ${source_files} NUM_FILES)
    if(${NUM_FILES} EQUAL 0)
        message(FATAL_ERROR "No source files found in ${DIR}")
    endif()

    # Adapt DIR var to backslash syntax of SOURCE_GROUP cmd
    if(${ARGC} EQUAL 2)
        string(REPLACE "/" "\\\\" DIR ${DIR})
        set(DIR "\\${DIR}")
    else()
        set(DIR "")
    endif()

    GET_CURRENT_SOURCE_SUBDIRECTORY(DIRECTORY)
    source_group("${DIRECTORY}${DIR}" FILES
        ${GET_SOURCE_FILES_HEADERS}
        ${GET_SOURCE_FILES_SOURCES}
        ${GET_SOURCE_FILES_TEMPLATES})

endmacro()

# Appends a list of source files (*.h and *.cpp) to source_files and creates a Visual
# Studio folder. A (relative) subdirectory can be passed as second parameter (optional).
macro(APPEND_SOURCE_FILES source_files)
    if(${ARGC} EQUAL 2)
        set(DIR "${ARGV1}")
    else()
        set(DIR ".")
    endif()

    GET_SOURCE_FILES(TMP_SOURCES "${DIR}")
    set(${source_files} ${${source_files}} ${TMP_SOURCES})
endmacro()

# Creates one ctest for each googletest found in source files passed as arguments
# number two onwards. Argument one specifies the testrunner executable.
macro(ADD_GOOGLE_TESTS executable)
    foreach(source ${ARGN})
        file(READ "${source}" contents)
        string(REGEX MATCHALL "TEST_?F?\\(([A-Za-z_0-9 ,]+)\\)" found_tests ${contents})
        foreach(hit ${found_tests})
            string(REGEX REPLACE ".*\\(([A-Za-z_0-9]+)[, ]*([A-Za-z_0-9]+)\\).*" "\\1.\\2" test_name ${hit})
            add_test(${test_name} ${executable}  --gtest_output=xml --gtest_filter=${test_name} ${MI3CTestingDir})
        endforeach()
    endforeach()
endmacro()

# Adds the include dir containing the autogenerated files to the PUBLIC
# interface of the given target
function(add_autogen_include target)
    get_property(IsMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
    if(IsMultiConfig)
        target_include_directories(${target} PUBLIC
            ${CMAKE_CURRENT_BINARY_DIR}/${target}_autogen/include_$<CONFIG>)
    else()
        target_include_directories(${target} PUBLIC
            ${CMAKE_CURRENT_BINARY_DIR}/${target}_autogen/include)
    endif()
endfunction()

# Replacement for add_library() for ogs targets
function(ogs_add_library targetName)
    add_library(${targetName} ${ARGN})
    target_compile_options(${targetName} PRIVATE
        # OR does not work with cotire
        # $<$<OR:$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>,
            #    $<CXX_COMPILER_ID:GNU>>:-Wall -Wextra>
        $<$<CXX_COMPILER_ID:Clang>:-Wall -Wextra -Wunreachable-code>
        $<$<CXX_COMPILER_ID:AppleClang>:-Wall -Wextra -Wunreachable-code>
        $<$<CXX_COMPILER_ID:GNU>:-Wall -Wextra -Wunreachable-code>
        $<$<CXX_COMPILER_ID:MSVC>:/W3>)

    if(BUILD_SHARED_LIBS)
        install(TARGETS ${targetName} LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})
    endif()

    include(GenerateExportHeader)
    generate_export_header(${targetName})
    target_include_directories(${targetName} PUBLIC ${CMAKE_CURRENT_BINARY_DIR})

    if(${CMAKE_VERSION} VERSION_GREATER_EQUAL 3.16)
        set_target_properties(${targetName} PROPERTIES
            UNITY_BUILD ${OGS_USE_UNITY_BUILDS})
    endif()
endfunction()

# Parses current directory into a list
function(current_dir_as_list baseDir outList)
    file(RELATIVE_PATH REL_DIR ${PROJECT_SOURCE_DIR}/${baseDir} ${CMAKE_CURRENT_LIST_DIR})
    string(REPLACE "/" ";" DIR_LIST ${REL_DIR})
    set(${outList} ${DIR_LIST} PARENT_SCOPE)
endfunction()