cmake_minimum_required(VERSION 3.20)

if(NOT UPDATE_CLIENT_SCAN_ROOT)
    message(FATAL_ERROR "UPDATE_CLIENT_SCAN_ROOT is required.")
endif()

cmake_path(
    ABSOLUTE_PATH UPDATE_CLIENT_SCAN_ROOT
    NORMALIZE
    OUTPUT_VARIABLE _scan_root
)
if(NOT IS_DIRECTORY "${_scan_root}")
    message(FATAL_ERROR "Production source scan root does not exist: ${_scan_root}")
endif()

file(GLOB_RECURSE _all_files LIST_DIRECTORIES FALSE "${_scan_root}/*")
set(_production_files)
foreach(_candidate IN LISTS _all_files)
    cmake_path(CONVERT "${_candidate}" TO_CMAKE_PATH_LIST _normalized_candidate NORMALIZE)
    cmake_path(
        RELATIVE_PATH _normalized_candidate
        BASE_DIRECTORY "${_scan_root}"
        OUTPUT_VARIABLE _relative_candidate
    )
    string(TOLOWER "${_relative_candidate}" _candidate_lower)
    if(_candidate_lower MATCHES
            "(^|/)(translations|docs|out|build|generated|cmake-build[^/]*|\\.git)(/|$)")
        continue()
    endif()
    if(_candidate_lower STREQUAL "bootstrap/bootstrap.rc")
        continue()
    endif()

    cmake_path(GET _normalized_candidate FILENAME _file_name)
    cmake_path(GET _normalized_candidate EXTENSION _file_extension)
    string(TOLOWER "${_file_extension}" _file_extension)
    if(NOT _file_name STREQUAL "CMakeLists.txt"
            AND NOT _file_extension MATCHES
                "^\\.(c|cc|cpp|cxx|h|hh|hpp|cmake|ui|qrc|manifest|rc|json)$")
        continue()
    endif()
    list(APPEND _production_files "${_candidate}")
endforeach()

set(_han_utf8_regex
    "(e3:[9ab][0-9a-f]:[89ab][0-9a-f]:"
    "|e[4-9]:[89ab][0-9a-f]:[89ab][0-9a-f]:"
    "|ef:a[4-9ab]:[89ab][0-9a-f]:"
    "|f0:a[0-9a-f]:[89ab][0-9a-f]:[89ab][0-9a-f]:"
    "|f0:b[01]:[89ab][0-9a-f]:[89ab][0-9a-f]:)"
)
string(JOIN "" _han_utf8_regex ${_han_utf8_regex})

set(_violations)
foreach(_production_file IN LISTS _production_files)
    file(READ "${_production_file}" _file_hex HEX)
    string(TOLOWER "${_file_hex}" _file_hex)
    string(REGEX REPLACE "([0-9a-f][0-9a-f])" "\\1:" _file_bytes "${_file_hex}")
    if(_file_bytes MATCHES "${_han_utf8_regex}")
        cmake_path(
            RELATIVE_PATH _production_file
            BASE_DIRECTORY "${_scan_root}"
            OUTPUT_VARIABLE _relative_file
        )
        list(APPEND _violations "${_relative_file}")
    endif()
endforeach()

if(_violations)
    list(JOIN _violations "\n  " _violation_list)
    message(FATAL_ERROR
        "Han characters are forbidden in update-client production sources:\n"
        "  ${_violation_list}\n"
        "Move user-visible text to the Qt translation catalog or the approved "
        "Bootstrap STRINGTABLE resource."
    )
endif()

list(LENGTH _production_files _production_file_count)
message(STATUS
    "No-Han production source check passed (${_production_file_count} files)."
)