option (USE_INTERNAL_POCO_LIBRARY "Set to FALSE to use system poco library instead of bundled" ${NOT_UNBUNDLED})

if (NOT EXISTS "${ClickHouse_SOURCE_DIR}/contrib/poco/CMakeLists.txt")
   message (WARNING "submodule contrib/poco is missing. to fix try run: \n git submodule update --init --recursive")
   set (USE_INTERNAL_POCO_LIBRARY 0)
endif ()

if (NOT USE_INTERNAL_POCO_LIBRARY)
    find_package (Poco COMPONENTS Net NetSSL XML Data Crypto DataODBC MongoDB)
endif ()

if (Poco_INCLUDE_DIRS AND Poco_Foundation_LIBRARY)
    #include_directories (${Poco_INCLUDE_DIRS})
else ()

    set (USE_INTERNAL_POCO_LIBRARY 1)

    set (ENABLE_ZIP 0 CACHE BOOL "")
    set (ENABLE_PAGECOMPILER 0 CACHE BOOL "")
    set (ENABLE_PAGECOMPILER_FILE2PAGE 0 CACHE BOOL "")
    set (ENABLE_REDIS 0 CACHE BOOL "")
    set (ENABLE_DATA_SQLITE 0 CACHE BOOL "")
    set (ENABLE_DATA_MYSQL 0 CACHE BOOL "")
    set (ENABLE_DATA_POSTGRESQL 0 CACHE BOOL "")
    set (POCO_UNBUNDLED 1 CACHE BOOL "")
    set (POCO_UNBUNDLED_PCRE 0 CACHE BOOL "")
    set (POCO_UNBUNDLED_EXPAT 0 CACHE BOOL "")
    set (POCO_STATIC ${MAKE_STATIC_LIBRARIES} CACHE BOOL "")
    set (POCO_VERBOSE_MESSAGES 1 CACHE BOOL "")

    include (${ClickHouse_SOURCE_DIR}/cmake/find_ltdl.cmake)
    include (${ClickHouse_SOURCE_DIR}/contrib/poco/cmake/FindODBC.cmake)

    # used in internal compiler
    list (APPEND Poco_INCLUDE_DIRS
        "${ClickHouse_SOURCE_DIR}/contrib/poco/Foundation/include/"
        "${ClickHouse_SOURCE_DIR}/contrib/poco/Util/include/"
    )

    if (NOT DEFINED POCO_ENABLE_MONGODB OR POCO_ENABLE_MONGODB)
        set (Poco_MongoDB_FOUND 1)
        set (Poco_MongoDB_LIBRARY PocoMongoDB)
        set (Poco_MongoDB_INCLUDE_DIRS "${ClickHouse_SOURCE_DIR}/contrib/poco/MongoDB/include/")
    endif ()

    if (ODBC_FOUND)
        set (Poco_DataODBC_FOUND 1)
        set (Poco_DataODBC_LIBRARY PocoDataODBC)
        list (APPEND Poco_DataODBC_LIBRARY ${LTDL_LIB})
        set (Poco_DataODBC_INCLUDE_DIRS "${ClickHouse_SOURCE_DIR}/contrib/poco/Data/ODBC/include/")
    endif ()

    if (OPENSSL_FOUND)
        set (Poco_NetSSL_FOUND 1)
        set (Poco_NetSSL_LIBRARY PocoNetSSL)
        set (Poco_Crypto_LIBRARY PocoCrypto)
        set (Poco_NetSSL_INCLUDE_DIRS 
            "${ClickHouse_SOURCE_DIR}/contrib/poco/NetSSL_OpenSSL/include/"
            "${ClickHouse_SOURCE_DIR}/contrib/poco/Crypto/include/"
        )
    endif ()

    if (USE_STATIC_LIBRARIES AND USE_INTERNAL_ZLIB_LIBRARY)
        list (APPEND Poco_INCLUDE_DIRS
            "${ClickHouse_SOURCE_DIR}/contrib/libzlib-ng/"
            "${ClickHouse_BINARY_DIR}/contrib/libzlib-ng/"
        )
    endif ()

    set (Poco_Foundation_LIBRARY PocoFoundation)
    set (Poco_Util_LIBRARY PocoUtil)
    set (Poco_Net_LIBRARY PocoNet)
    set (Poco_Data_LIBRARY PocoData)
    set (Poco_XML_LIBRARY PocoXML)

    #include_directories (BEFORE ${Poco_INCLUDE_DIRS})

endif ()

message(STATUS "Using Poco: ${Poco_INCLUDE_DIRS} : ${Poco_Foundation_LIBRARY},${Poco_Util_LIBRARY},${Poco_Net_LIBRARY},${Poco_NetSSL_LIBRARY},${Poco_XML_LIBRARY},${Poco_Data_LIBRARY},${Poco_DataODBC_LIBRARY},${Poco_MongoDB_LIBRARY}; MongoDB=${Poco_MongoDB_FOUND}, DataODBC=${Poco_DataODBC_FOUND}, NetSSL=${Poco_NetSSL_FOUND}")

# How to make sutable poco:
# use branch:
#  develop  OR  poco-1.7.9-release + 6a49c94d18c654d7a20b8c8ea47071b1fdd4813b
# and merge:
# ClickHouse-Extras/clickhouse_unbundled
# ClickHouse-Extras/clickhouse_unbundled_zlib
# ClickHouse-Extras/clickhouse_task   # uses c++11, can't push to poco
# ClickHouse-Extras/clickhouse_misc
# ClickHouse-Extras/clickhouse_anl
# ClickHouse-Extras/clickhouse_http_header https://github.com/pocoproject/poco/pull/1574
# ClickHouse-Extras/clickhouse_socket
# ClickHouse-Extras/clickhouse_warning