""" This module loads the entire VTK library into its namespace.  It
also allows one to use specific packages inside the vtk directory.."""

from __future__ import absolute_import

import os
import sys


# The dl module is used to force the symbols in the loaded VTK modules to
# be global, that is, to force symbols to be shared between modules.  This
# used to be necessary in VTK 4 but might not be with VTK 5 and later.

# The first "except" is because systems like AIX don't have the dl module.
# The second "except" is because the dl module raises a system error on
# ia64 and x86_64 systems because "int" and addresses are different sizes.
try:
    import dl
except ImportError:
    # do not give up too early:
    # are we on AMD64 ?
    try:
      import DLFCN as dl
    except ImportError:
      dl = None
except SystemError:
    dl = None

# set the dlopen flags so that VTK does not run into problems with
# shared symbols.
try:
    # only Python >= 2.2 has this functionality
    orig_dlopen_flags = sys.getdlopenflags()
except AttributeError:
    orig_dlopen_flags = None

if dl and (os.name == 'posix'):
    sys.setdlopenflags(dl.RTLD_NOW|dl.RTLD_GLOBAL)

# --------------------------------------
@VTK_PYTHON_IMPORT_ALL@# --------------------------------------

# useful macro for getting type names
__vtkTypeNameDict = {VTK_VOID:"void",
                     VTK_DOUBLE:"double",
                     VTK_FLOAT:"float",
                     VTK_LONG:"long",
                     VTK_UNSIGNED_LONG:"unsigned long",
                     VTK_INT:"int",
                     VTK_UNSIGNED_INT:"unsigned int",
                     VTK_SHORT:"short",
                     VTK_UNSIGNED_SHORT:"unsigned short",
                     VTK_CHAR:"char",
                     VTK_UNSIGNED_CHAR:"unsigned char",
                     VTK_SIGNED_CHAR:"signed char",
                     VTK_LONG_LONG:"long long",
                     VTK_UNSIGNED_LONG_LONG:"unsigned long long",
                     VTK___INT64:"__int64",
                     VTK_UNSIGNED___INT64:"unsigned __int64",
                     VTK_ID_TYPE:"vtkIdType",
                     VTK_BIT:"bit"}

def vtkImageScalarTypeNameMacro(type):
  return __vtkTypeNameDict[type]

# import convenience decorators
from .util.misc import calldata_type

# import the vtkVariant helpers
from .util.vtkVariant import *

# reset the dlopen flags to the original state if possible.
if dl and (os.name == 'posix') and orig_dlopen_flags:
    sys.setdlopenflags(orig_dlopen_flags)

# removing things the user shouldn't have to see.
del orig_dlopen_flags
del sys, dl, os