# Applied after project(): component targets already exist at this point.
include_guard(GLOBAL)

function(monitoring_patch_tapif)
    idf_build_get_property(tap_target IDF_TARGET)
    if(NOT "${tap_target}" STREQUAL "linux")
        return()
    endif()

    idf_component_get_property(tap_lib protocol_examples_tapif_io COMPONENT_LIB)
    idf_component_get_property(tap_dir protocol_examples_tapif_io COMPONENT_DIR)
    idf_build_get_property(tap_idf_path IDF_PATH)
    get_filename_component(tap_dir "${tap_dir}" REALPATH)
    get_filename_component(tap_sdk_dir
        "${tap_idf_path}/examples/common_components/protocol_examples_tapif_io" REALPATH)
    if(NOT "${tap_dir}" STREQUAL "${tap_sdk_dir}")
        message(FATAL_ERROR
            "TAP must come from ESP-IDF. Move components/protocol_examples_tapif_io outside the project, then reconfigure.")
    endif()

    set(tap_patch_dir "${CMAKE_CURRENT_FUNCTION_LIST_DIR}/../patches/protocol_examples_tapif_io")
    set(tap_generated_dir "${CMAKE_BINARY_DIR}/monitoring_tapif")
    file(MAKE_DIRECTORY "${tap_generated_dir}/lwip")

    # Quoted includes search the source's own directory before -I directories.
    # Relocate this unmodified SDK source so it finds our matching declaration.
    configure_file("${tap_dir}/linux_connect.c"
        "${tap_generated_dir}/linux_connect.c" COPYONLY)
    configure_file("${tap_patch_dir}/tapif.h"
        "${tap_generated_dir}/lwip/tapif.h" COPYONLY)

    get_target_property(tap_sources "${tap_lib}" SOURCES)
    set(tap_new_sources "")
    set(tap_input_found FALSE)
    set(tap_connect_found FALSE)
    foreach(tap_source IN LISTS tap_sources)
        get_filename_component(tap_absolute "${tap_source}" ABSOLUTE BASE_DIR "${tap_dir}")
        if("${tap_absolute}" STREQUAL "${tap_dir}/lwip/tapif.c")
            list(APPEND tap_new_sources "${tap_patch_dir}/tapif.c")
            set(tap_input_found TRUE)
        elseif("${tap_absolute}" STREQUAL "${tap_dir}/linux_connect.c")
            list(APPEND tap_new_sources "${tap_generated_dir}/linux_connect.c")
            set(tap_connect_found TRUE)
        else()
            list(APPEND tap_new_sources "${tap_source}")
        endif()
    endforeach()
    if(NOT tap_input_found OR NOT tap_connect_found)
        message(FATAL_ERROR
            "Unexpected TAP source list. This compatibility patch was prepared for ESP-IDF v6.0.2.")
    endif()
    set_property(TARGET "${tap_lib}" PROPERTY SOURCES "${tap_new_sources}")
    message(STATUS "TAP: using ESP-IDF component with project-local tapif.c/tapif.h fix")
endfunction()

monitoring_patch_tapif()