if (OS_LINUX)
    option(ENABLE_ICU "Enable ICU" ${ENABLE_LIBRARIES})
else ()
    option(ENABLE_ICU "Enable ICU" 0)
endif ()

if (NOT ENABLE_ICU)
    message(STATUS "Not using ICU")
    return()
endif()

set(ICU_SOURCE_DIR "${ClickHouse_SOURCE_DIR}/contrib/icu/icu4c/source")
set(ICUDATA_SOURCE_DIR "${ClickHouse_SOURCE_DIR}/contrib/icudata/")

set (CMAKE_CXX_STANDARD 17)

# These lists of sources were generated from build log of the original ICU build system (configure + make).

set(ICUUC_SOURCES
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set(ICUI18N_SOURCES
"${ICU_SOURCE_DIR}/i18n/ucln_in.cpp"
"${ICU_SOURCE_DIR}/i18n/fmtable.cpp"
"${ICU_SOURCE_DIR}/i18n/format.cpp"
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"${ICU_SOURCE_DIR}/i18n/datefmt.cpp"
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"${ICU_SOURCE_DIR}/i18n/reldtfmt.cpp"
"${ICU_SOURCE_DIR}/i18n/dtfmtsym.cpp"
"${ICU_SOURCE_DIR}/i18n/udat.cpp"
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"${ICU_SOURCE_DIR}/i18n/udatpg.cpp"
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"${ICU_SOURCE_DIR}/i18n/nfsubs.cpp"
"${ICU_SOURCE_DIR}/i18n/rbnf.cpp"
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"${ICU_SOURCE_DIR}/i18n/unumsys.cpp"
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"${ICU_SOURCE_DIR}/i18n/ucal.cpp"
"${ICU_SOURCE_DIR}/i18n/calendar.cpp"
"${ICU_SOURCE_DIR}/i18n/gregocal.cpp"
"${ICU_SOURCE_DIR}/i18n/timezone.cpp"
"${ICU_SOURCE_DIR}/i18n/simpletz.cpp"
"${ICU_SOURCE_DIR}/i18n/olsontz.cpp"
"${ICU_SOURCE_DIR}/i18n/astro.cpp"
"${ICU_SOURCE_DIR}/i18n/taiwncal.cpp"
"${ICU_SOURCE_DIR}/i18n/buddhcal.cpp"
"${ICU_SOURCE_DIR}/i18n/persncal.cpp"
"${ICU_SOURCE_DIR}/i18n/islamcal.cpp"
"${ICU_SOURCE_DIR}/i18n/japancal.cpp"
"${ICU_SOURCE_DIR}/i18n/gregoimp.cpp"
"${ICU_SOURCE_DIR}/i18n/hebrwcal.cpp"
"${ICU_SOURCE_DIR}/i18n/indiancal.cpp"
"${ICU_SOURCE_DIR}/i18n/chnsecal.cpp"
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"${ICU_SOURCE_DIR}/i18n/coptccal.cpp"
"${ICU_SOURCE_DIR}/i18n/dangical.cpp"
"${ICU_SOURCE_DIR}/i18n/ethpccal.cpp"
"${ICU_SOURCE_DIR}/i18n/coleitr.cpp"
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"${ICU_SOURCE_DIR}/i18n/bocsu.cpp"
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"${ICU_SOURCE_DIR}/i18n/ucol_sit.cpp"
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"${ICU_SOURCE_DIR}/i18n/collationsettings.cpp"
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"${ICU_SOURCE_DIR}/i18n/double-conversion-strtod.cpp"
"${ICU_SOURCE_DIR}/i18n/string_segment.cpp"
"${ICU_SOURCE_DIR}/i18n/numparse_parsednumber.cpp"
"${ICU_SOURCE_DIR}/i18n/numparse_impl.cpp"
"${ICU_SOURCE_DIR}/i18n/numparse_symbols.cpp"
"${ICU_SOURCE_DIR}/i18n/numparse_decimal.cpp"
"${ICU_SOURCE_DIR}/i18n/numparse_scientific.cpp"
"${ICU_SOURCE_DIR}/i18n/numparse_currency.cpp"
"${ICU_SOURCE_DIR}/i18n/numparse_affixes.cpp"
"${ICU_SOURCE_DIR}/i18n/numparse_compositions.cpp"
"${ICU_SOURCE_DIR}/i18n/numparse_validators.cpp"
"${ICU_SOURCE_DIR}/i18n/numrange_fluent.cpp"
"${ICU_SOURCE_DIR}/i18n/numrange_impl.cpp"
"${ICU_SOURCE_DIR}/i18n/erarules.cpp"
"${ICU_SOURCE_DIR}/i18n/formattedvalue.cpp"
"${ICU_SOURCE_DIR}/i18n/formattedval_iterimpl.cpp"
"${ICU_SOURCE_DIR}/i18n/formattedval_sbimpl.cpp"
"${ICU_SOURCE_DIR}/i18n/formatted_string_builder.cpp"
"${ICU_SOURCE_DIR}/i18n/measunit_extra.cpp"
"${ICU_SOURCE_DIR}/i18n/number_symbolswrapper.cpp"
"${ICU_SOURCE_DIR}/i18n/number_usageprefs.cpp"
"${ICU_SOURCE_DIR}/i18n/numrange_capi.cpp"
"${ICU_SOURCE_DIR}/i18n/pluralranges.cpp"
"${ICU_SOURCE_DIR}/i18n/units_complexconverter.cpp"
"${ICU_SOURCE_DIR}/i18n/units_converter.cpp"
"${ICU_SOURCE_DIR}/i18n/units_data.cpp"
"${ICU_SOURCE_DIR}/i18n/units_router.cpp")

file(GENERATE OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/empty.cpp" CONTENT " ")
enable_language(ASM)

if (ARCH_S390X)
    set(ICUDATA_SOURCE_FILE "${ICUDATA_SOURCE_DIR}/icudt70b_dat.S" )
else()
    set(ICUDATA_SOURCE_FILE "${ICUDATA_SOURCE_DIR}/icudt70l_dat.S" )
endif()

set(ICUDATA_SOURCES
    "${ICUDATA_SOURCE_FILE}"
    "${CMAKE_CURRENT_BINARY_DIR}/empty.cpp" # Without this cmake can incorrectly detects library type (OBJECT) instead of SHARED/STATIC
)

# Note that we don't like any kind of binary plugins (because of runtime dependencies, vulnerabilities, ABI incompatibilities).
add_definitions(-D_REENTRANT -DU_HAVE_ELF_H=1 -DU_HAVE_STRTOD_L=1 -DU_HAVE_XLOCALE_H=0 -DDEFAULT_ICU_PLUGINS="/dev/null")

add_library(_icuuc ${ICUUC_SOURCES})
add_library(_icui18n ${ICUI18N_SOURCES})
add_library(_icudata ${ICUDATA_SOURCES})

target_link_libraries(_icuuc PRIVATE _icudata)
target_link_libraries(_icui18n PRIVATE _icuuc)

target_include_directories(_icuuc SYSTEM PUBLIC "${ICU_SOURCE_DIR}/common/")
target_include_directories(_icui18n SYSTEM PUBLIC "${ICU_SOURCE_DIR}/i18n/")

target_compile_definitions(_icuuc PRIVATE -DU_COMMON_IMPLEMENTATION)
target_compile_definitions(_icui18n PRIVATE -DU_I18N_IMPLEMENTATION)

add_library(_icu INTERFACE)
target_link_libraries(_icu INTERFACE _icui18n _icuuc _icudata)
add_library(ch_contrib::icu ALIAS _icu)