 # Macro to add directory to NODEJS_INCLUDE_DIRS if it exists and is not /usr/include
 macro(add_include_dir dir)
    if (IS_DIRECTORY ${dir} AND NOT ${dir} STREQUAL "/usr/include")
      set(NODEJS_INCLUDE_DIRS ${NODEJS_INCLUDE_DIRS} ${dir})
    endif()
endmacro()


find_program (NODEJS_EXECUTABLE NAMES node nodejs
    HINTS
    $ENV{NODE_DIR}
    PATH_SUFFIXES bin
    DOC "Node.js interpreter"
)

include (FindPackageHandleStandardArgs)

# If compat-libuv package exists, it must be at start of include path
find_path (UV_ROOT_DIR "uv.h" PATHS /usr/include/compat-libuv010 NO_DEFAULT_PATH)
if (UV_ROOT_DIR)
  # set (NODEJS_INCLUDE_DIRS ${UV_ROOT_DIR})
  add_include_dir(${UV_ROOT_DIR})
endif()

# Now look for node. Flag an error if not found
find_path (NODE_ROOT_DIR "node/node.h" "src/node.h"
  PATHS /usr/include/nodejs /usr/local/include/nodejs /usr/local/include)
if (NODE_ROOT_DIR)
  add_include_dir(${NODE_ROOT_DIR}/src)
  add_include_dir(${NODE_ROOT_DIR}/node)
  add_include_dir(${NODE_ROOT_DIR}/deps/v8/include)
  add_include_dir(${NODE_ROOT_DIR}/deps/uv/include)
else()
  unset(NODEJS_INCLUDE_DIRS)
  message(ERROR " - node.h not found")
endif()

# Check that v8.h is in NODEJS_INCLUDE_DIRS
find_path (V8_ROOT_DIR "v8.h" PATHS ${NODEJS_INCLUDE_DIRS})
if (NOT V8_ROOT_DIR)
  unset(NODEJS_INCLUDE_DIRS)
  message(ERROR " - v8.h not found")
endif()

# Check that uv.h is in NODEJS_INCLUDE_DIRS
find_path (UV_ROOT_DIR "uv.h" PATHS ${NODEJS_INCLUDE_DIRS})
if (NOT UV_ROOT_DIR)
  unset(NODEJS_INCLUDE_DIRS)
  message(ERROR " - uv.h not found")
endif()

find_package_handle_standard_args (Nodejs DEFAULT_MSG
    NODEJS_EXECUTABLE
    NODEJS_INCLUDE_DIRS
)

if (NODEJS_EXECUTABLE)
    execute_process(COMMAND ${NODEJS_EXECUTABLE} --version
                    OUTPUT_VARIABLE _VERSION
                    RESULT_VARIABLE _NODE_VERSION_RESULT)
    execute_process(COMMAND ${NODEJS_EXECUTABLE} -e "console.log(process.versions.v8)"
                    OUTPUT_VARIABLE _V8_VERSION
                    RESULT_VARIABLE _V8_RESULT)
    if (NOT _NODE_VERSION_RESULT AND NOT _V8_RESULT)
        string (REPLACE "v" "" NODE_VERSION_STRING "${_VERSION}")
        string (REPLACE "." ";" _VERSION_LIST "${NODE_VERSION_STRING}")
        list (GET _VERSION_LIST 0 NODE_VERSION_MAJOR)
        list (GET _VERSION_LIST 1 NODE_VERSION_MINOR)
        list (GET _VERSION_LIST 2 NODE_VERSION_PATCH)
        set (V8_VERSION_STRING ${_V8_VERSION})
        string (REPLACE "." ";" _V8_VERSION_LIST "${_V8_VERSION}")
        list (GET _V8_VERSION_LIST 0 V8_VERSION_MAJOR)
        list (GET _V8_VERSION_LIST 1 V8_VERSION_MINOR)
        list (GET _V8_VERSION_LIST 2 V8_VERSION_PATCH)
        # we end up with a nasty newline so strip everything that isn't a number
        string (REGEX MATCH "^[0-9]*" V8_VERSION_PATCH ${V8_VERSION_PATCH})
    else ()
        set (NODE_VERSION_STRING "0.10.30")
        set (NODE_VERSION_MAJOR "0")
        set (NODE_VERSION_MINOR "10")
        set (NODE_VERSION_PATCH "30")
        set (V8_VERSION_MAJOR "3")
        set (V8_VERSION_MINOR"14")
        set (V8_VERSION_PATCH "5")
        set (V8_VERSION_STRING "3.28.72")
        message ("defaulted to node 0.10.30")
    endif ()
    string (REGEX REPLACE "\n" "" NODE_VERSION_STRING ${NODE_VERSION_STRING})
    string (REGEX REPLACE "\n" "" V8_VERSION_STRING ${V8_VERSION_STRING})
    message ("INFO - Node version is " ${NODE_VERSION_STRING})
    message ("INFO - Node using v8 " ${V8_VERSION_STRING})
    mark_as_advanced (NODEJS_EXECUTABLE)
endif ()