import logging
from slipnet import slipnet

class ConceptMapping(object):
	def __init__(self, initialDescriptionType, targetDescriptionType, initialDescriptor, targetDescriptor, initialObject, targetObject):
		logging.info('make a map: %s-%s' % (initialDescriptionType.get_name(), targetDescriptionType.get_name()))
		self.initialDescriptionType = initialDescriptionType
		self.targetDescriptionType = targetDescriptionType
		self.initialDescriptor = initialDescriptor
		self.targetDescriptor = targetDescriptor
		self.initialObject = initialObject
		self.targetObject = targetObject
		self.label = initialDescriptor.getBondCategory(targetDescriptor)

	def __repr__(self):
		return '<ConceptMapping: %s from %s to %s>' % (self.__str__(), self.initialDescriptor, self.targetDescriptor)

	def __str__(self):
		if self.label:
			return self.label.name
		return 'anonymous'

	def slipability(self):
		association = self.__degreeOfAssociation()
		if association == 100.0:
			return 100.0
		depth = self.__conceptualDepth() / 100.0
		return association * ( 1 - depth * depth )

	def __degreeOfAssociation(self):
		#assumes the 2 descriptors are connected in the slipnet by at most 1 link
		if self.initialDescriptor == self.targetDescriptor:
			return 100.0
		for link in self.initialDescriptor.lateralSlipLinks:
			if link.destination == self.targetDescriptor:
				return link.degreeOfAssociation()
		return 0.0

	def strength(self):
		association = self.__degreeOfAssociation()
		if association == 100.0:
			return 100.0
		depth = self.__conceptualDepth() / 100.0
		return association * ( 1 + depth * depth )

	def __conceptualDepth(self):
		return (self.initialDescriptor.conceptualDepth + self.targetDescriptor.conceptualDepth ) / 2.0

	def distinguishing(self):
		if self.initialDescriptor == slipnet.whole and self.targetDescriptor == slipnet.whole:
			return False
		if not self.initialObject.distinguishingDescriptor(self.initialDescriptor):
			return False
		if not self.targetObject.distinguishingDescriptor(self.targetDescriptor):
			return False
		return True

	def sameInitialType(self, other):
		return self.initialDescriptionType == other.initialDescriptionType

	def sameTargetType(self, other):
		return self.targetDescriptionType == other.targetDescriptionType

	def sameTypes(self, other):
		return self.sameInitialType(other) and self.sameTargetType(other)

	def sameInitialDescriptor(self, other):
		return self.initialDescriptor == other.initialDescriptor

	def sameTargetDescriptor(self, other):
		return self.targetDescriptor == other.targetDescriptor

	def sameDescriptors(self, other):
		return self.sameInitialDescriptor(other) and self.sameTargetDescriptor(other)

	def sameKind(self, other):
		return self.sameTypes(other) and self.sameDescriptors(other)

	def nearlySameKind(self, other):
		return self.sameTypes(other) and self.sameInitialDescriptor(other)

	def isContainedBy(self, mappings):
		for mapping in mappings:
			if self.sameKind(mapping):
				return True
		return False

	def isNearlyContainedBy(self, mappings):
		for mapping in mappings:
			if self.nearlySameKind(mapping):
				return True
		return False

	def related(self, other):
		if self.initialDescriptor.related(other.initialDescriptor):
			return True
		return self.targetDescriptor.related(other.targetDescriptor)

	def incompatible(self, other):
		# Concept-mappings (a -> b) and (c -> d) are incompatible if a is
		# related to c or if b is related to d, and the a -> b relationship is
		# different from the c -> d relationship. E.g., rightmost -> leftmost
		# is incompatible with right -> right, since rightmost is linked
		# to right, but the relationships (opposite and identity) are different.
		# Notice that slipnet distances are not looked at, only slipnet links. This
		# should be changed eventually.
		if not self.related(other):
			return False
		if not self.label or not other.label:
			return False
		if self.label != other.label:
			return True
		return False

	def supports(self, other):
		# Concept-mappings (a -> b) and (c -> d) support each other if a is related
		# to c and if b is related to d and the a -> b relationship is the same as the
		# c -> d relationship.  E.g., rightmost -> rightmost supports right -> right
		# and leftmost -> leftmost.  Notice that slipnet distances are not looked
		# at, only slipnet links.  This should be changed eventually.

		# If the two concept-mappings are the same, then return t.  This
		# means that letter->group supports letter->group, even though these
		# concept-mappings have no label.

		if self.initialDescriptor == other.initialDescriptor and self.targetDescriptor == other.targetDescriptor:
			return True
		# if the descriptors are not related return false
		if not self.related(other):
			return False
		if not self.label or not other.label:
			return False
		if self.label == other.label:
			return True
		return False

	def relevant(self):
		return self.initialDescriptionType.fully_active() and self.targetDescriptionType.fully_active()

	def slippage(self):
		return self.label != slipnet.sameness and self.label != slipnet.identity

	def symmetricVersion(self):
		if not self.slippage():
			return self
		if self.targetDescriptor.getBondCategory(self.initialDescriptor) == self.label:
			return self
		return ConceptMapping(
			self.targetDescriptionType,
			self.initialDescriptionType,
			self.targetDescriptor,
			self.initialDescriptor1,
			self.initialObject,
			self.targetObject
		)