if(VCPKG_TARGET_IS_LINUX AND NOT EXISTS "/usr/include/libintl.h")
    message(FATAL_ERROR "When targeting Linux, `libintl.h` is expected to come from the C Runtime Library (glibc). "
                        "Please use \"sudo apt-get install libc-dev\" or the equivalent to install development files."
    )
endif()

set(VCPKG_POLICY_ALLOW_RESTRICTED_HEADERS enabled)

#Based on https://github.com/winlibs/gettext

set(GETTEXT_VERSION 0.21)

vcpkg_download_distfile(ARCHIVE
    URLS "https://ftp.gnu.org/pub/gnu/gettext/gettext-${GETTEXT_VERSION}.tar.gz" "https://www.mirrorservice.org/sites/ftp.gnu.org/gnu/gettext/gettext-${GETTEXT_VERSION}.tar.gz"
    FILENAME "gettext-${GETTEXT_VERSION}.tar.gz"
    SHA512 bbe590c5dd3580c75bf30ff768da99a88eb8d466ec1ac9eea20be4cab4357ecf72448e6b81b47425e39d50fa6320ba426632914d7898dfebb4f159abc39c31d1
)
set(PATCHES "")
if(VCPKG_TARGET_IS_UWP)
    set(PATCHES uwp_remove_localcharset.patch)
endif()
vcpkg_extract_source_archive_ex(
    OUT_SOURCE_PATH SOURCE_PATH
    ARCHIVE "${ARCHIVE}"
    REF "${GETTEXT_VERSION}"
    PATCHES
        0002-Fix-uwp-build.patch
        0003-Fix-win-unicode-paths.patch
        0004-Fix-uwp-tools-build.patch
        rel_path.patch
        android.patch
        gettext-tools_woe32dll_gettextsrc-exports.c.patch
        ${PATCHES}
)
vcpkg_find_acquire_program(BISON)
get_filename_component(BISON_PATH "${BISON}" DIRECTORY)
vcpkg_add_to_path("${BISON_PATH}")

set(OPTIONS
    --enable-relocatable #symbol duplication with glib-init.c?
    --enable-c++
    --disable-acl
    --disable-csharp
    --disable-curses
    --disable-java
    --disable-openmp
)
if(VCPKG_TARGET_IS_WINDOWS)
    list(APPEND OPTIONS
        # Avoid unnecessary test.
        --with-included-glib
        # This is required. For some reason these do not get correctly identified for release builds.
        ac_cv_func_wcslen=yes
        ac_cv_func_memmove=yes
        # The following are required for a full gettext built (libintl and tools).
        gl_cv_func_printf_directive_n=no  # segfaults otherwise with popup window
        ac_cv_func_memset=yes             # not detected in release builds
        ac_cv_header_pthread_h=no
        ac_cv_header_dirent_h=no
        ac_cv_header_getopt_h=no
    )
endif()

# These functions scope any changes to VCPKG_BUILD_TYPE
function(build_libintl_and_tools)
    cmake_parse_arguments(arg "" "BUILD_TYPE" "" ${ARGN})
    if(DEFINED arg_BUILD_TYPE)
        set(VCPKG_BUILD_TYPE "${arg_BUILD_TYPE}")
    endif()
    vcpkg_configure_make(SOURCE_PATH "${SOURCE_PATH}"
        DETERMINE_BUILD_TRIPLET
        USE_WRAPPERS
        ADD_BIN_TO_PATH # So configure can check for working iconv
        ADDITIONAL_MSYS_PACKAGES gzip
        OPTIONS
            ${OPTIONS}
    )
    vcpkg_install_make(MAKEFILE "${CMAKE_CURRENT_LIST_DIR}/Makefile")
endfunction()

function(build_libintl_only)
    cmake_parse_arguments(arg "" "BUILD_TYPE" "" ${ARGN})
    if(DEFINED arg_BUILD_TYPE)
        set(VCPKG_BUILD_TYPE "${arg_BUILD_TYPE}")
    endif()
    vcpkg_configure_make(SOURCE_PATH "${SOURCE_PATH}/gettext-runtime"
        DETERMINE_BUILD_TRIPLET
        USE_WRAPPERS
        ADD_BIN_TO_PATH # So configure can check for working iconv
        OPTIONS
            ${OPTIONS}
    )
    vcpkg_install_make(
        MAKEFILE "${CMAKE_CURRENT_LIST_DIR}/Makefile"
        BUILD_TARGET   build-intl
        INSTALL_TARGET install-intl
    )
endfunction()

if("tools" IN_LIST FEATURES)
    # Minimization of gettext tools build time by:
    # - building tools only for release configuration
    # - custom top-level Makefile
    # - configuration cache
    list(APPEND OPTIONS "--cache-file=../config.cache-${TARGET_TRIPLET}")
    file(REMOVE_RECURSE "${CURRENT_BUILDTREES_DIR}/config.cache-${TARGET_TRIPLET}")
    build_libintl_and_tools(BUILD_TYPE "release")
    vcpkg_copy_tool_dependencies("${CURRENT_PACKAGES_DIR}/tools/${PORT}/bin")
    file(GLOB tool_libs
        LIST_DIRECTORIES false
        "${CURRENT_PACKAGES_DIR}/bin/*"
        "${CURRENT_PACKAGES_DIR}/lib/*"
    )
    list(FILTER tool_libs EXCLUDE REGEX "intl[^/\\\\]*$")
    file(REMOVE ${tool_libs})
    file(GLOB tool_includes
        LIST_DIRECTORIES true
        "${CURRENT_PACKAGES_DIR}/include/*"
    )
    list(FILTER tool_includes EXCLUDE REGEX "intl[^/\\\\]*$")
    file(REMOVE_RECURSE ${tool_includes})
    if(VCPKG_TARGET_IS_LINUX)
        set(VCPKG_POLICY_EMPTY_PACKAGE enabled)
        file(REMOVE_RECURSE "${CURRENT_PACKAGES_DIR}/include")
        file(REMOVE_RECURSE "${CURRENT_PACKAGES_DIR}/lib")
    elseif(NOT DEFINED VCPKG_BUILD_TYPE OR VCPKG_BUILD_TYPE STREQUAL "debug")
        file(REMOVE_RECURSE "${CURRENT_PACKAGES_DIR}.release")
        file(RENAME "${CURRENT_PACKAGES_DIR}" "${CURRENT_PACKAGES_DIR}.release")
        file(READ "${CURRENT_BUILDTREES_DIR}/config.cache-${TARGET_TRIPLET}" config_cache)
        string(REGEX REPLACE "\nac_cv_env[^\n]*" "" config_cache "${config_cache}") # Eliminate build type flags
        file(WRITE "${CURRENT_BUILDTREES_DIR}/config.cache-${TARGET_TRIPLET}" "${config_cache}")
        build_libintl_only(BUILD_TYPE "debug")
        file(RENAME "${CURRENT_PACKAGES_DIR}/debug" "${CURRENT_PACKAGES_DIR}.release/debug")
        file(REMOVE_RECURSE "${CURRENT_PACKAGES_DIR}")
        file(RENAME "${CURRENT_PACKAGES_DIR}.release" "${CURRENT_PACKAGES_DIR}")
    endif()
else()
    if(VCPKG_TARGET_IS_LINUX)
        set(VCPKG_POLICY_EMPTY_PACKAGE enabled)
    else()
        list(APPEND OPTIONS "--config-cache")
        build_libintl_only()
    endif()
    # A fast installation of the autopoint tool and data, needed for autotools
    include("${CMAKE_CURRENT_LIST_DIR}/install-autopoint.cmake")
    install_autopoint()
endif()

# Handle copyright
configure_file("${SOURCE_PATH}/COPYING" "${CURRENT_PACKAGES_DIR}/share/gettext/copyright" COPYONLY)

file(REMOVE_RECURSE "${CURRENT_PACKAGES_DIR}/debug/share")

vcpkg_copy_pdbs()

if(NOT VCPKG_TARGET_IS_LINUX)
    file(COPY "${CMAKE_CURRENT_LIST_DIR}/vcpkg-cmake-wrapper.cmake" DESTINATION "${CURRENT_PACKAGES_DIR}/share/intl")
endif()
if("tools" IN_LIST FEATURES AND NOT VCPKG_CROSSCOMPILING)
    file(COPY "${CMAKE_CURRENT_LIST_DIR}/vcpkg-port-config.cmake" DESTINATION "${CURRENT_PACKAGES_DIR}/share/gettext")
endif()

if(EXISTS "${CURRENT_PACKAGES_DIR}/lib/gettext/user-email")
    vcpkg_replace_string("${CURRENT_PACKAGES_DIR}/lib/gettext/user-email" "${CURRENT_INSTALLED_DIR}" "`dirname $0`/../..")
endif()