include(ExternalProject)

# ExternalProject seems to be the best solution for including zeromq.
# The projects defines options which clash with and pollute our CMake cache.

# Define the compile flags for Windows
if(WIN32)
    set(WIN_CMAKE_ARGS "-DCMAKE_CXX_FLAGS_DEBUG=$<IF:$<BOOL:${STATIC_WINDOWS_RUNTIME}>,/MTd,/MDd> ${CMAKE_CXX_FLAGS_DEBUG_INIT}"
                       "-DCMAKE_CXX_FLAGS_RELEASE=$<IF:$<BOOL:${STATIC_WINDOWS_RUNTIME}>,/MT,/MD> ${CMAKE_CXX_FLAGS_RELEASE_INIT}"
                       "-DCMAKE_CXX_FLAGS_RELWITHDEBINFO=$<IF:$<BOOL:${STATIC_WINDOWS_RUNTIME}>,/MT,/MD> ${CMAKE_CXX_FLAGS_RELWITHDEBINFO_INIT}"
                       "-DCMAKE_CXX_FLAGS_MINSIZEREL=$<IF:$<BOOL:${STATIC_WINDOWS_RUNTIME}>,/MT,/MD> ${CMAKE_CXX_FLAGS_MINSIZEREL_INIT}"
                       "-DCMAKE_C_FLAGS_DEBUG=$<IF:$<BOOL:${STATIC_WINDOWS_RUNTIME}>,/MTd,/MDd> ${CMAKE_C_FLAGS_DEBUG_INIT}"
                       "-DCMAKE_C_FLAGS_RELEASE=$<IF:$<BOOL:${STATIC_WINDOWS_RUNTIME}>,/MT,/MD> ${CMAKE_C_FLAGS_RELEASE_INIT}"
                       "-DCMAKE_C_FLAGS_RELWITHDEBINFO=$<IF:$<BOOL:${STATIC_WINDOWS_RUNTIME}>,/MT,/MD> ${CMAKE_C_FLAGS_RELWITHDEBINFO_INIT}"
                       "-DCMAKE_C_FLAGS_MINSIZEREL=$<IF:$<BOOL:${STATIC_WINDOWS_RUNTIME}>,/MT,/MD> ${CMAKE_C_FLAGS_MINSIZEREL_INIT}"
                       )
    set(lib_name libzmq)
    if(CMAKE_VS_PLATFORM_TOOLSET)
        string(APPEND lib_name -${CMAKE_VS_PLATFORM_TOOLSET})
    endif()
    string(APPEND lib_name -mt-s)
    set(lib_suffix -4_3_3)
else()
    set(WIN_CMAKE_ARGS "")
    set(lib_name zmq)
endif()


ExternalProject_Add(
    ext_zeromq
    PREFIX zeromq
    URL https://github.com/zeromq/libzmq/releases/download/v4.3.3/zeromq-4.3.3.tar.gz
    URL_HASH SHA256=9d9285db37ae942ed0780c016da87060497877af45094ff9e1a1ca736e3875a2
    DOWNLOAD_DIR "${OPEN3D_THIRD_PARTY_DOWNLOAD_DIR}/zeromq"
    # do not update
    UPDATE_COMMAND ""
    CMAKE_ARGS
        # Does not seem to work. We have to directly set the flags on Windows.
        #-DCMAKE_POLICY_DEFAULT_CMP0091:STRING=NEW
        #-DCMAKE_MSVC_RUNTIME_LIBRARY:STRING=${CMAKE_MSVC_RUNTIME_LIBRARY}
        -DBUILD_STATIC=ON
        -DBUILD_SHARED=OFF
        -DBUILD_TESTS=OFF
        -DENABLE_CPACK=OFF
        -DENABLE_CURVE=OFF
        -DZMQ_BUILD_TESTS=OFF
        -DWITH_DOCS=OFF
        -DWITH_PERF_TOOL=OFF
        -DCMAKE_INSTALL_PREFIX=<INSTALL_DIR>
        ${ExternalProject_CMAKE_ARGS_hidden}
        ${WIN_CMAKE_ARGS}
    BUILD_BYPRODUCTS
        <INSTALL_DIR>/${Open3D_INSTALL_LIB_DIR}/${CMAKE_STATIC_LIBRARY_PREFIX}${lib_name}${lib_suffix}${CMAKE_STATIC_LIBRARY_SUFFIX}
        <INSTALL_DIR>/${Open3D_INSTALL_LIB_DIR}/${CMAKE_STATIC_LIBRARY_PREFIX}${lib_name}gd${lib_suffix}${CMAKE_STATIC_LIBRARY_SUFFIX}
)

# cppzmq is header only. we just need to download
ExternalProject_Add(
    ext_cppzmq
    PREFIX zeromq
    URL https://github.com/zeromq/cppzmq/archive/v4.7.1.tar.gz
    URL_HASH SHA256=9853e0437d834cbed5d3c223bf1d755cadee70e7c964c6e42c4c6783dee5d02c
    DOWNLOAD_DIR "${OPEN3D_THIRD_PARTY_DOWNLOAD_DIR}/zeromq"
    UPDATE_COMMAND ""
    CONFIGURE_COMMAND ""
    BUILD_COMMAND ""
    INSTALL_COMMAND ""
)

if(WIN32)
    # On windows the lib name is more complicated
    set(ZEROMQ_LIBRARIES ${lib_name}$<$<CONFIG:Debug>:gd>${lib_suffix})

    # On windows we need to link some additional libs. We will use them
    # directly as targets in find_dependencies.cmake.
    # The following code is taken from the zeromq CMakeLists.txt and collects
    # the additional libs in ZEROMQ_ADDITIONAL_LIBS.
    include(CheckCXXSymbolExists)
    set(CMAKE_REQUIRED_LIBRARIES "ws2_32.lib")
    check_cxx_symbol_exists(WSAStartup "winsock2.h" HAVE_WS2_32)

    set(CMAKE_REQUIRED_LIBRARIES "rpcrt4.lib")
    check_cxx_symbol_exists(UuidCreateSequential "rpc.h" HAVE_RPCRT4)

    set(CMAKE_REQUIRED_LIBRARIES "iphlpapi.lib")
    check_cxx_symbol_exists(GetAdaptersAddresses "winsock2.h;iphlpapi.h" HAVE_IPHLPAPI)
    set(CMAKE_REQUIRED_LIBRARIES "")

    if(HAVE_WS2_32)
        list(APPEND ZEROMQ_ADDITIONAL_LIBS ws2_32)
    endif()
    if(HAVE_RPCRT4)
        list(APPEND ZEROMQ_ADDITIONAL_LIBS rpcrt4)
    endif()
    if(HAVE_IPHLPAPI)
        list(APPEND ZEROMQ_ADDITIONAL_LIBS iphlpapi)
    endif()
else()
    set(ZEROMQ_LIBRARIES ${lib_name}${lib_suffix})
endif()

ExternalProject_Get_Property(ext_zeromq INSTALL_DIR)
ExternalProject_Get_Property(ext_cppzmq SOURCE_DIR)
set(ZEROMQ_LIB_DIR ${INSTALL_DIR}/${Open3D_INSTALL_LIB_DIR})
set(ZEROMQ_INCLUDE_DIRS "${INSTALL_DIR}/include/" "${SOURCE_DIR}/")