"""Configuration Helper for ParticleHandler"""
from __future__ import absolute_import, unicode_literals
from DDSim.Helper.ConfigHelper import ConfigHelper
from g4units import MeV, mm
import logging

logger = logging.getLogger(__name__)


class ParticleHandler(ConfigHelper):
  """Configuration for the Particle Handler/ MCTruth treatment"""

  def __init__(self):
    super(ParticleHandler, self).__init__()
    self._saveProcesses = ['Decay']
    self._minimalKineticEnergy = 1 * MeV
    self._keepAllParticles = False
    self._printEndTracking = False
    self._printStartTracking = False
    self._minDistToParentVertex = 2.2e-14 * mm
    self._enableDetailedHitsAndParticleInfo = False
    self._userParticleHandler = "Geant4TCUserParticleHandler"

  @property
  def enableDetailedHitsAndParticleInfo(self):
    """Enable lots of printout on simulated hits and MC-truth information"""
    return self._enableDetailedHitsAndParticleInfo

  @enableDetailedHitsAndParticleInfo.setter
  def enableDetailedHitsAndParticleInfo(self, val):
    self._enableDetailedHitsAndParticleInfo = val

  @property
  def userParticleHandler(self):
    """Optionally enable an extended Particle Handler"""
    return self._userParticleHandler

  @userParticleHandler.setter
  def userParticleHandler(self, val):
    self._userParticleHandler = val

  @property
  def minDistToParentVertex(self):
    """Minimal distance between particle vertex and endpoint of parent after
    which the vertexIsNotEndpointOfParent flag is set
    """
    return self._minDistToParentVertex

  @minDistToParentVertex.setter
  def minDistToParentVertex(self, val):
    self._minDistToParentVertex = val

  @property
  def saveProcesses(self):
    """List of processes to save, on command line give as whitespace separated string in quotation marks"""
    return self._saveProcesses

  @saveProcesses.setter
  def saveProcesses(self, stringVal):
    self._saveProcesses = ConfigHelper.makeList(stringVal)

  @property
  def minimalKineticEnergy(self):
    """MinimalKineticEnergy to store particles created in the tracking region"""
    return self._minimalKineticEnergy

  @minimalKineticEnergy.setter
  def minimalKineticEnergy(self, val):
    self._minimalKineticEnergy = val

  @property
  def keepAllParticles(self):
    """ Keep all created particles """
    return self._keepAllParticles

  @keepAllParticles.setter
  def keepAllParticles(self, val):
    self._keepAllParticles = val

  @property
  def printStartTracking(self):
    """ Printout at Start of Tracking """
    return self._printStartTracking

  @printStartTracking.setter
  def printStartTracking(self, val):
    self._printEndTracking = val

  @property
  def printEndTracking(self):
    """ Printout at End of Tracking """
    return self._printEndTracking

  @printEndTracking.setter
  def printEndTracking(self, val):
    self._printEndTracking = val

  def setDumpDetailedParticleInfo(self, kernel, DDG4):
    # ---- debug code from Markus for detailed dumps of hits and MC-truth assignement ------
    # Add the particle dumper to associate the MC truth
    evt = DDG4.EventAction(kernel, "Geant4ParticleDumpAction/ParticleDump")
    kernel.eventAction().adopt(evt)
    evt.enableUI()
    # Add the hit dumper BEFORE any hit truth is fixed
    evt = DDG4.EventAction(kernel, "Geant4HitDumpAction/RawDump")
    kernel.eventAction().adopt(evt)
    evt.enableUI()
    # Add the hit dumper to the event action sequence
    evt = DDG4.EventAction(kernel, "Geant4HitTruthHandler/HitTruth")
    kernel.eventAction().adopt(evt)
    evt.enableUI()
    # Add the hit dumper AFTER any hit truth is fixed. We should see the reduced track references
    evt = DDG4.EventAction(kernel, "Geant4HitDumpAction/HitDump")
    kernel.eventAction().adopt(evt)
    evt.enableUI()

  def setupUserParticleHandler(self, part, kernel, DDG4):
    """Create the UserParticleHandler and configure it.

    FIXME: this is not extensible at the moment
    """
    if not self.userParticleHandler:
      return

    if self.userParticleHandler not in ["Geant4TCUserParticleHandler"]:
      logger.error("unknown UserParticleHandler: %r" % self.userParticleHandler)
      exit(1)

    if self.userParticleHandler == "Geant4TCUserParticleHandler":
      user = DDG4.Action(kernel, "%s/UserParticleHandler" % self.userParticleHandler)
      try:
        user.TrackingVolume_Zmax = DDG4.tracker_region_zmax
        user.TrackingVolume_Rmax = DDG4.tracker_region_rmax
      except AttributeError as e:
        logger.error("Attribute of tracker region missing in detector model %s", e)
        logger.error("   make sure to specify the global constants tracker_region_zmax and tracker_region_rmax ")
        logger.error("   this is needed for the MC-truth link of created sim-hits  !  ")
        logger.error(" Or Disable the User Particle Handler with --part.userParticleHandler=''")
        exit(1)

      try:
        user.TrackingVolume_Zmin = DDG4.tracker_region_zmin
      except AttributeError as e:
        logger.info("Attribute tracker_region_zmin for asymmetric tracker region missing %s", e)
        logger.info("  will use symmetric region defined by tracker_region_zmax")
        user.TrackingVolume_Zmin = str(-float(user.TrackingVolume_Zmax))

      logger.info(" *** definition of tracker region *** ")
      logger.info("    tracker_region_zmin = %s", user.TrackingVolume_Zmin)
      logger.info("    tracker_region_zmax = %s", user.TrackingVolume_Zmax)
      logger.info("    tracker_region_rmax = %s", user.TrackingVolume_Rmax)
      logger.info(" ************************************ ")

      part.adopt(user)

    return