import os, sys

try:
	from gdcmVersion import *
except:
	print "gdcmVersion not imported"

def BuildInstallOrPreinstallPath(DirName, FileName = None):
   # Builds a path to the DirName directory. This should work both when:
   # - the package is properly installed in which case DirName is a subdir
   #   of the package,
   # - when in pre-installation mode (basically inside a CVS hierarchy)
   #   in which case DirName and the package itself lie at the same
   #   filesystem level.
   # In both cases we need to express the full path to DirName relatively
   # to the path to this __init__.py. For this we rely on __path__ variable.
   # In order to make sure we got the correct Path, we check for the
   # existence of FileName if it is setted otherwise for the existence of the
   # DirName.
   InstallModePath = os.path.join(__path__[0], DirName + "/")
   if(FileName):
      if os.path.isfile(os.path.join(InstallModePath, FileName)):
         return InstallModePath
   else:
      if os.path.isdir(InstallModePath):
         return InstallModePath

   PreInstallModePath = os.path.join(__path__[0], "..", DirName + "/")
   if(FileName):
      if os.path.isfile(os.path.join(PreInstallModePath, FileName)):
         return PreInstallModePath
   else:
      if os.path.isdir(PreInstallModePath):
         return PreInstallModePath
   return None

### Setup the path to the dictionaries. WARNING: this needs to be done
#   BEFORE importation of the shadow classes generated by swig as found
#   in gdcm, since the dynamic library loads the standard dictionary
#   when dynamically loaded.
#   We consider we succefully found the dictionaries path when we encounter
#   the standard dictionary i.e. the file dicomV3.dic.

try:
   ### First consider the environnement variable.
   os.environ["GDCM_DICT_PATH"]
   if not os.path.isfile(os.path.join(os.environ["GDCM_DICT_PATH"],
                                      "dicomV3.dic")):
      raise KeyError
except KeyError:
   Path = BuildInstallOrPreinstallPath("Dicts", "dicomV3.dic")
   if not Path:
      print "Path to dictionaries is mandatory. Exiting"
      sys.exit(1)
   os.environ["GDCM_DICT_PATH"] = Path
GDCM_DICT_PATH = os.environ["GDCM_DICT_PATH"]

### Set up the path to the data images for the demos.
if os.environ["GDCM_DATA_PATH"]:
   GDCM_DATA_PATH = BuildInstallOrPreinstallPath(os.environ["GDCM_DATA_PATH"],
                                                 "test.acr")
else:
   GDCM_DATA_PATH = BuildInstallOrPreinstallPath("Test", "test.acr")
if not GDCM_DATA_PATH:
   print "GDCM_DATA_PATH is not setup properly: unfound Test directory"

### Set up the path to the data images of the test suite.
GDCM_TEST_DATA_PATH = BuildInstallOrPreinstallPath("gdcmData")

### Import the swig generated shadow classes.
try:
   import gdcm
except ImportError,e:
   print e
   raise ImportError, "gdcm extension not imported."

### Expose only the necessary stuff
gdcmGlobal          = gdcm.gdcmGlobal
gdcmDictSet         = gdcm.gdcmDictSet
gdcmDicomDir        = gdcm.gdcmDicomDir
gdcmHeader          = gdcm.gdcmHeader
gdcmHeaderHelper    = gdcm.gdcmHeaderHelper
gdcmFile            = gdcm.gdcmFile

gdcmDicomDirMeta    = gdcm.gdcmDicomDirMeta
gdcmDicomDirPatient = gdcm.gdcmDicomDirPatient
gdcmDicomDirStudy   = gdcm.gdcmDicomDirStudy
gdcmDicomDirSerie   = gdcm.gdcmDicomDirSerie
gdcmDicomDirImage   = gdcm.gdcmDicomDirImage

def GetPubDictEntryNames():
   return gdcmGlobal.GetDicts().GetPubDictEntryNames()

def GetPubDictEntryNamesByCategory():
   return gdcmGlobal.GetDicts().GetPubDictEntryNamesByCategory()