"""Helper object for SD Actions
"""

from DDSim.Helper.ConfigHelper import ConfigHelper

class Action( ConfigHelper ):
  """Action holding sensitive detector actions
  The default tracker and calorimeter actions can be set with

  >>> SIM = DD4hepSimulation()
  >>> SIM.action.tracker = "Geant4TrackerAction"
  >>> SIM.action.calo    = "Geant4CalorimeterAction"

  for specific subdetectors specific sensitive detectors can be set based on pattern matching

  >>> SIM = DD4hepSimulation()
  >>> SIM.action.mapActions['tpc'] = "TPCSDAction"

  and additional parameters for the sensitive detectors can be set when the map is given a tuple

  >>> SIM = DD4hepSimulation()
  >>> SIM.action.mapActions['ecal'] =( "CaloPreShowerSDAction", {"FirstLayerNumber": 1} )

  """
  def __init__( self ):
    super(Action, self).__init__()
    self._tracker = 'Geant4TrackerAction'
    self._calo = 'Geant4ScintillatorCalorimeterAction'
    self._mapActions = dict()

  @property
  def tracker( self ):
    """ set the default tracker action """
    return self._tracker
  @tracker.setter
  def tracker( self, val ):
    self._tracker = val

  @property
  def calo( self ):
    """ set the default calorimeter action """
    return self._calo
  @calo.setter
  def calo( self, val ):
    self._calo = val


  @property
  def mapActions( self ):
    """ create a map of patterns and actions to be applied to sensitive detectors
        example: SIM.action.mapActions['tpc'] = "TPCSDAction" """
    return self._mapActions

  @mapActions.setter
  def mapActions( self, val ):
    """check if the argument is a dict, then we just update mapActions
    if it is a string or list, we use pairs as patterns --> Action
    """
    if isinstance(val, dict):
      self._mapActions.update(val)
      return

    if isinstance(val, basestring):
      vals = val.split(" ")
    elif isinstance( val, list ):
      vals = val
    if len(vals)%2 != 0:
      raise RuntimeError("Not enough parameters for mapActions")
    for index in xrange(0,len(vals),2):
      self._mapActions[vals[index]] = vals[index+1]

  def clearMapActions( self ):
    """empty the mapActions dictionary"""
    self._mapActions = dict()