function(add_module)
    cmake_parse_arguments(
        ARGS
        ""
        "NAME"
        "INTERFACES;ROOT_DIR;SOURCES;DEPENDENCIES;PRIVATE_DEPENDENCIES;TESTS;ENTRYPOINT"
        ${ARGN}
    )

    if(NOT ARGS_NAME)
        message(FATAL_ERROR "You must provide a name")
    endif()

    set(target_library_name ${ARGS_NAME})
    set(target_executable_name ${ARGS_NAME})

    set(module_directory "${CMAKE_CURRENT_SOURCE_DIR}/${target_library_name}")
    if(ARGS_ROOT_DIR)
        set(module_directory "${ARGS_ROOT_DIR}")
    endif()

    # In this case, the module is an executable, so we prepend "lib" to the
    # target name. And set the "executable_target" name to ARGS_NAME.
    #
    # The rationale here is to easily be able to write tests for an executable
    # modules's interfaces... by splitting it into two targets:
    # lib"executable_name" for the interface and "executable_name" for the "int
    # main()" defining file (the entrypoint).

    # The lib"executable_name" should not be disruptive since an executable
    # module's library will not be dependent upon (except by the tests within
    # the same module)
    if(ARGS_ENTRYPOINT)
        set(target_library_name "lib_${ARGS_NAME}")
        add_executable(
            ${target_executable_name} ${module_directory}/${ARGS_ENTRYPOINT}
        )
    endif()
    add_library(${target_library_name})

    if(ARGS_SOURCES)
        set(files)
        foreach(file ${ARGS_SOURCES})
            list(APPEND files "${module_directory}/${file}")
        endforeach()

        target_sources(${target_library_name} PRIVATE ${files})
    endif()

    if(ARGS_PUBLIC_SOURECS)
        set(files)
        foreach(file ${ARGS_PUBLIC_SOURECS})
            list(APPEND files "${module_directory}/${file}")
        endforeach()
        target_sources(${target_library_name} PUBLIC ${files})
    endif()

    if(ARGS_INTERFACES)
        set(files)
        foreach(file ${ARGS_INTERFACES})
            list(APPEND files "${module_directory}/${file}")
        endforeach()
        target_sources(
            ${target_library_name} PUBLIC FILE_SET public_cxx_modules TYPE
                                          CXX_MODULES FILES ${files}
        )
    endif()

    target_link_libraries(${target_library_name} PUBLIC ${ARGS_DEPENDENCIES})
    target_link_libraries(
        ${target_library_name} PRIVATE ${ARGS_PRIVATE_DEPENDENCIES}
    )

    if(ARGS_TESTS)
        message("ADDING TESTS!!!")
        set(test_files)
        foreach(test_file ${ARGS_TESTS})
            list(APPEND test_files "${module_directory}/${test_file}")
        endforeach()

        add_executable("${target_library_name}_tests" ${test_files})
        target_link_libraries(
            "${target_library_name}_tests"
            PRIVATE ${target_lib_name}
                    #
                    test
        )
    endif()

    if(ARGS_ENTRYPOINT)
        target_link_libraries(
            ${target_executable_name} PRIVATE ${target_library_name}
        )
    endif()
endfunction()

function(add_executable_module exename)
    set(source_files)
    set(source_directory "${CMAKE_CURRENT_SOURCE_DIR}/private")
    foreach(source_file ${ARGN})
        list(APPEND source_files "${source_directory}/${source_file}")
    endforeach()

    message("Adding executable ${exename} with source files: ${source_files}")

    set(PUBLIC_INCLUDE_DIR "${CMAKE_CURRENT_BINARY_DIR}/public_includes")
    file(MAKE_DIRECTORY "${PUBLIC_INCLUDE_DIR}")
    file(CREATE_LINK "${CMAKE_CURRENT_SOURCE_DIR}/public/"
         "${PUBLIC_INCLUDE_DIR}/${exename}" SYMBOLIC
    )
    set(PRIVATE_INCLUDE_DIR "${CMAKE_CURRENT_BINARY_DIR}/private_includes")
    file(MAKE_DIRECTORY "${PRIVATE_INCLUDE_DIR}")
    file(CREATE_LINK "${CMAKE_CURRENT_SOURCE_DIR}/private/"
         "${PRIVATE_INCLUDE_DIR}${exename}" SYMBOLIC
    )

endfunction()

function(add_test_module target_lib_name)
    # if(NOT ${ENABLE_UNIT_TESTS}) return() endif()

    add_executable(${target_lib_name}_tests ${ARGN})
    target_link_libraries(
        ${target_lib_name}_tests
        PRIVATE ${target_lib_name}
                #
                test
    )

    return()

    set(source_files)
    set(source_directory "${CMAKE_CURRENT_SOURCE_DIR}/private")
    foreach(source_file ${ARGN})
        list(APPEND source_files "${source_directory}/${source_file}")
    endforeach()

    message(
        "Adding test executable ${target_lib_name}_tests with source files: ${source_files}"
    )

    set(PUBLIC_INCLUDE_DIR "${CMAKE_CURRENT_BINARY_DIR}/public_includes")
    file(MAKE_DIRECTORY "${PUBLIC_INCLUDE_DIR}")
    file(CREATE_LINK "${CMAKE_CURRENT_SOURCE_DIR}/public/"
         "${PUBLIC_INCLUDE_DIR}/${target_lib_name}" SYMBOLIC
    )
    set(PRIVATE_INCLUDE_DIR "${CMAKE_CURRENT_BINARY_DIR}/private_includes")
    file(MAKE_DIRECTORY "${PRIVATE_INCLUDE_DIR}")
    file(CREATE_LINK "${CMAKE_CURRENT_SOURCE_DIR}/private/"
         "${PRIVATE_INCLUDE_DIR}/${target_lib_name}" SYMBOLIC
    )

    add_executable(${target_lib_name}_tests ${source_files})
    target_link_libraries(
        ${target_lib_name}_tests PRIVATE ${target_lib_name} std test
    )
    target_include_directories(
        ${target_lib_name}_tests
        PRIVATE ${PUBLIC_INCLUDE_DIR}
        PRIVATE ${PRIVATE_INCLUDE_DIR}
    )
endfunction()

function(add_fuzz_module target_lib_name)
    if(NOT ${ENABLE_FUZZ_TESTS})
        return()
    endif()

    set(source_files)
    set(source_directory "${CMAKE_CURRENT_SOURCE_DIR}/private")
    foreach(source_file ${ARGN})
        list(APPEND source_files "${source_directory}/${source_file}")
    endforeach()

    message(
        "Adding fuzz executable ${target_lib_name}_fuzz with source files: ${source_files}"
    )

    set(PUBLIC_INCLUDE_DIR "${CMAKE_CURRENT_BINARY_DIR}/public_includes")
    file(MAKE_DIRECTORY "${PUBLIC_INCLUDE_DIR}")
    file(CREATE_LINK "${CMAKE_CURRENT_SOURCE_DIR}/public/"
         "${PUBLIC_INCLUDE_DIR}/${target_lib_name}" SYMBOLIC
    )
    set(PRIVATE_INCLUDE_DIR "${CMAKE_CURRENT_BINARY_DIR}/private_includes")
    file(MAKE_DIRECTORY "${PRIVATE_INCLUDE_DIR}")
    file(CREATE_LINK "${CMAKE_CURRENT_SOURCE_DIR}/private/"
         "${PRIVATE_INCLUDE_DIR}/${target_lib_name}" SYMBOLIC
    )

    add_executable(${target_lib_name}_fuzz ${source_files})
    target_link_libraries(
        ${target_lib_name}_fuzz PRIVATE ${target_lib_name} std fuzz_test
    )
    target_link_options(${target_lib_name}_fuzz PRIVATE -fsanitize=fuzzer)
    target_compile_options(${target_lib_name}_fuzz PRIVATE -fsanitize=fuzzer)
    target_include_directories(
        ${target_lib_name}_fuzz
        PRIVATE ${PUBLIC_INCLUDE_DIR}
        PRIVATE ${PRIVATE_INCLUDE_DIR}
    )
endfunction()

function(add_option option help)
    option(${option} ${help})

    if(${option})
        message(STATUS "${option}: ON")
        add_compile_definitions(${option}=1)
    else()
        message(STATUS "${option}: OFF")
    endif()
endfunction()