# -*- coding: utf-8 -*-
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import zope.interface
from AccessControl import ClassSecurityInfo

from Products.ERP5.Document.Predicate import Predicate
from Products.ERP5Type import Permissions, PropertySheet, interfaces
from Products.ERP5.mixin.equivalence_tester import EquivalenceTesterMixin

class CategoryMembershipEquivalenceTester(Predicate, EquivalenceTesterMixin):
  """
  The purpose of this divergence tester is to check the
  consistency between delivery movement and simulation movement
  for a specific category.
  """
  meta_type = 'ERP5 Category Membership Equivalence Tester'
  portal_type = 'Category Membership Equivalence Tester'
  add_permission = Permissions.AddPortalContent

  # Declarative security
  security = ClassSecurityInfo()
  security.declareObjectProtected(Permissions.AccessContentsInformation)

  # Declarative properties
  property_sheets = (   PropertySheet.Base
                      , PropertySheet.XMLObject
                      , PropertySheet.CategoryCore
                      , PropertySheet.DublinCore
                      , PropertySheet.EquivalenceTester
                      , PropertySheet.SolverSelection
                     )

  # Declarative interfaces
  zope.interface.implements( interfaces.IEquivalenceTester, )

  def _compare(self, prevision_movement, decision_movement):
    """
    If prevision_movement and decision_movement don't match, it returns a
    list : (prevision_value, decision_value, message, mapping)
    """
    tested_property = self.getTestedProperty()
    if getattr(decision_movement, 'isPropertyRecorded',
               lambda x:False)(tested_property):
      decision_value = decision_movement.getRecordedProperty(tested_property)
    else:
      decision_value = decision_movement.getPropertyList(tested_property)
    prevision_value = prevision_movement.getPropertyList(tested_property)

    # XXX do we have configurable parameter for this divergence tester ?
    # like ambiguity...
    if sorted(decision_value) != sorted(prevision_value):
      return (
        prevision_value, decision_value,
        'The values of ${property_name} category are different between decision and prevision.',
        dict(property_name=tested_property))
    return None

  def generateHashKey(self, movement):
    """
    Returns a hash key which can be used to optimise the
    matching algorithm between movements. The purpose
    of this hash key is to reduce the size of lists of
    movements which need to be compared using the compare
    method (quadratic complexity).

    If decision_movement is a simulation movement, use
    the recorded properties instead of the native ones.
    """
    tested_property = self.getTestedProperty()
    if movement.isPropertyRecorded(tested_property):
      value = movement.getRecordedProperty(tested_property)
    else:
      value = movement.getPropertyList(tested_property)
    return '%s/%r' % (tested_property, value)

  def getUpdatablePropertyDict(self, prevision_movement, decision_movement):
    """
    Returns a list of properties to update on decision_movement
    prevision_movement so that next call to compare returns True.

    prevision_movement -- a simulation movement (prevision)

    decision_movement -- a delivery movement (decision)
    """
    tested_property = self.getTestedProperty()
    prevision_value = prevision_movement.getPropertyList(tested_property)
    return {tested_property:prevision_value}

  def accept(self, simulation_movement):
    """
    Copies the properties handled by the divergence tester
    from the related delivery movement to simulation_movement.

    NOTE: the future existence of this method is still unknown
    because it is likely to be implemented in TargetSolver
    instead.
    """
    raise NotImplementedError

  def adopt(self, simulation_movement):
    """
    Copies the properties handled by the divergence tester
    from simulation_movement to the related delivery movement

    NOTE: the future existence of this method is still unknown
    because it is likely to be implemented in TargetSolver
    instead.
    """
    raise NotImplementedError