if(OS_LINUX AND TARGET OpenSSL::SSL)
    option(ENABLE_MYSQL "Enable MySQL" ${ENABLE_LIBRARIES})
else ()
    option(ENABLE_MYSQL "Enable MySQL" FALSE)
endif ()

if(NOT ENABLE_MYSQL)
    if (USE_INTERNAL_MYSQL_LIBRARY)
        message (${RECONFIGURE_MESSAGE_LEVEL} "Cannot use internal mysql library with ENABLE_MYSQL=OFF")
    endif ()
    message (STATUS "Build without mysqlclient (support for MYSQL dictionary source will be disabled)")
    return()
endif()

option(USE_INTERNAL_MYSQL_LIBRARY "Set to FALSE to use system mysqlclient library instead of bundled" ON)

if(NOT EXISTS "${ClickHouse_SOURCE_DIR}/contrib/mariadb-connector-c/README")
    if(USE_INTERNAL_MYSQL_LIBRARY)
        message(WARNING "submodule contrib/mariadb-connector-c is missing. to fix try run: \n git submodule update --init")
        message (${RECONFIGURE_MESSAGE_LEVEL} "Can't find internal mysql library")
        set(USE_INTERNAL_MYSQL_LIBRARY 0)
    endif()
    set(MISSING_INTERNAL_MYSQL_LIBRARY 1)
endif()

if (NOT USE_INTERNAL_MYSQL_LIBRARY)
    set (MYSQL_LIB_PATHS
        "/usr/local/opt/mysql/lib"
        "/usr/local/lib"
        "/usr/local/lib64"
        "/usr/local/lib/mariadb" # macos brew mariadb-connector-c
        "/usr/mysql/lib"
        "/usr/mysql/lib64"
        "/usr/lib"
        "/usr/lib64"
        "/lib"
        "/lib64")

    set (MYSQL_INCLUDE_PATHS
        "/usr/local/opt/mysql/include"
        "/usr/mysql/include"
        "/usr/local/include"
        "/usr/include/mariadb"
        "/usr/include/mysql"
        "/usr/include")

    find_path (MYSQL_INCLUDE_DIR NAMES mysql.h mysql/mysql.h mariadb/mysql.h PATHS ${MYSQL_INCLUDE_PATHS} PATH_SUFFIXES mysql)

    if (USE_STATIC_LIBRARIES)
        find_library (STATIC_MYSQLCLIENT_LIB NAMES mariadbclient mysqlclient PATHS ${MYSQL_LIB_PATHS} PATH_SUFFIXES mysql)
    else ()
        find_library (MYSQLCLIENT_LIBRARIES NAMES mariadb mariadbclient mysqlclient PATHS ${MYSQL_LIB_PATHS} PATH_SUFFIXES mysql)
    endif ()

    if (MYSQL_INCLUDE_DIR AND (STATIC_MYSQLCLIENT_LIB OR MYSQLCLIENT_LIBRARIES))
        set (USE_MYSQL 1)
        set (MYSQLXX_LIBRARY mysqlxx)
        if (APPLE)
            # /usr/local/include/mysql/mysql_com.h:1011:10: fatal error: mysql/udf_registration_types.h: No such file or directory
            set(MYSQL_INCLUDE_DIR ${MYSQL_INCLUDE_DIR} ${MYSQL_INCLUDE_DIR}/mysql)
        endif ()
    else ()
        message (${RECONFIGURE_MESSAGE_LEVEL} "Can't find system mysql library")
    endif ()
endif ()

if (NOT USE_MYSQL AND NOT MISSING_INTERNAL_MYSQL_LIBRARY)
    set (MYSQLCLIENT_LIBRARIES mariadbclient)
    set (MYSQLXX_LIBRARY mysqlxx)
    set (USE_MYSQL 1)
    set (USE_INTERNAL_MYSQL_LIBRARY 1)
endif()

if (USE_MYSQL)
    message (STATUS "Using mysqlclient=${USE_MYSQL}: ${MYSQL_INCLUDE_DIR} : ${MYSQLCLIENT_LIBRARIES}; staticlib=${STATIC_MYSQLCLIENT_LIB}")
else ()
    message (STATUS "Build without mysqlclient (support for MYSQL dictionary source will be disabled)")
endif ()