# Only the lwIP backend needs this fix. Keep the managed component immutable.
function(project_mdns_membership_overlay)
    if(CONFIG_MDNS_NETWORKING_SOCKET)
        return()
    endif()
    idf_component_get_property(mdns_dir espressif__mdns COMPONENT_DIR)
    idf_component_get_property(mdns_lib espressif__mdns COMPONENT_LIB)
    idf_component_get_property(mdns_version espressif__mdns COMPONENT_VERSION)
    if(NOT mdns_version STREQUAL "1.12.0")
        message(FATAL_ERROR "mDNS membership overlay requires component version 1.12.0; review upstream")
    endif()
    idf_build_get_property(python PYTHON)
    set(helper "${CMAKE_CURRENT_LIST_DIR}/mdns_membership.py")
    set(original "${mdns_dir}/mdns_networking_lwip.c")
    set(overlay "${CMAKE_BINARY_DIR}/mdns_membership/mdns_networking_lwip.c")
    set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS
        "${helper}" "${original}" "${mdns_dir}/idf_component.yml" "${overlay}")
    execute_process(COMMAND "${python}" "${helper}" "${mdns_dir}" "${overlay}"
        RESULT_VARIABLE result OUTPUT_VARIABLE output ERROR_VARIABLE error)
    if(NOT result EQUAL 0)
        message(FATAL_ERROR "mDNS membership overlay failed: ${output}${error}")
    endif()

    get_target_property(sources ${mdns_lib} SOURCES)
    get_target_property(source_dir ${mdns_lib} SOURCE_DIR)
    set(replaced 0)
    set(updated_sources)
    foreach(source IN LISTS sources)
        get_filename_component(absolute "${source}" ABSOLUTE BASE_DIR "${source_dir}")
        if(absolute STREQUAL original)
            list(APPEND updated_sources "${overlay}")
            math(EXPR replaced "${replaced} + 1")
        else()
            list(APPEND updated_sources "${source}")
        endif()
    endforeach()
    if(NOT replaced EQUAL 1)
        message(FATAL_ERROR "Expected exactly one mDNS lwIP target source, found ${replaced}; review upstream CMake")
    endif()
    set_property(TARGET ${mdns_lib} PROPERTY SOURCES "${updated_sources}")
    message(STATUS "mDNS 1.12.0: using guarded build-local multicast membership fix")
endfunction()

project_mdns_membership_overlay()