cmake/Date.cmake

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# distributed with this work for additional information
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# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
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# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

include(FetchContent)

if (WIN32)
    # tzdata and windowsZones.xml from unicode cldr-common are required to be installed for date-tz operation on Windows
    FetchContent_Declare(tzdata
        URL         https://data.iana.org/time-zones/releases/tzdata2020e.tar.gz
        URL_HASH    SHA256=0be1ba329eae29ae1b54057c3547b3e672f73b3ae7643aa87dac85122bec037e
    )
    FetchContent_GetProperties(tzdata)
    if (NOT tzdata_POPULATED)
        FetchContent_Populate(tzdata)
    endif()

    install(DIRECTORY ${tzdata_SOURCE_DIR}/
        DESTINATION tzdata
        COMPONENT tzdata
    )

    FetchContent_Declare(cldr_common
        URL         https://unicode.org/Public/cldr/38.1/cldr-common-38.1.zip
        URL_HASH    SHA512=3d641921c82c15b6257791229ed20db391675089927959869a5d96b17e7d0c3ad9063faf21151766eafe8ff7b85a98b37b9608f4c4f1d3f6f2b8e5565725db03
    )
    FetchContent_GetProperties(cldr_common)
    if (NOT cldr_common_POPULATED)
        FetchContent_Populate(cldr_common)
    endif()

    install(FILES ${cldr_common_SOURCE_DIR}/common/supplemental/windowsZones.xml
        DESTINATION tzdata
        COMPONENT tzdata
    )
endif()

FetchContent_Declare(date_src
    GIT_REPOSITORY https://github.com/HowardHinnant/date.git
    GIT_TAG        v3.0.0  # adjust tag/branch/commit as needed
)
FetchContent_GetProperties(date_src)
if (NOT date_src_POPULATED)
    FetchContent_Populate(date_src)
    set(DATE_INCLUDE_DIR 
        $<BUILD_INTERFACE:${date_src_SOURCE_DIR}/include>
        $<INSTALL_INTERFACE:include>
    )
    add_library(date INTERFACE)
    add_library(date::date ALIAS date)
    target_sources(date INTERFACE ${DATE_INCLUDE_DIR}/date/date.h)
    target_include_directories(date INTERFACE ${DATE_INCLUDE_DIR})
    target_compile_features(date INTERFACE cxx_std_11)

    add_library(date-tz STATIC ${date_src_SOURCE_DIR}/src/tz.cpp)
    add_library(date::tz ALIAS date-tz)
    target_include_directories(date-tz PUBLIC ${DATE_INCLUDE_DIR})
    target_compile_features(date-tz PUBLIC cxx_std_11)
    target_compile_definitions(date-tz PRIVATE AUTO_DOWNLOAD=0 HAS_REMOTE_API=0)
    if (WIN32)
        target_compile_definitions(date-tz PRIVATE INSTALL=. PUBLIC USE_OS_TZDB=0)
    else()
        target_compile_definitions(date-tz PUBLIC USE_OS_TZDB=1)
    endif()
    if (NOT MSVC)
        find_package(Threads)
        target_link_libraries(date-tz PUBLIC Threads::Threads)
    endif()
endif()