import logging
from workspaceStructure import WorkspaceStructure

class Description(WorkspaceStructure):
	def __init__(self,workspaceObject,descriptionType,descriptor):
		WorkspaceStructure.__init__(self)
		self.object = workspaceObject
		self.string = workspaceObject.string
		self.descriptionType = descriptionType
		self.descriptor = descriptor

	def __repr__(self):
		return '<Description: %s>' % self.__str__()

	def __str__(self):
		s = 'description(%s) of %s' % (self.descriptor.get_name(),self.object)
		from workspace import workspace
		if self.object.string == workspace.initial:
			s += ' in initial string'
		else:
			s += ' in target string'
		return s

	def updateInternalStrength(self):
		self.internalStrength = self.descriptor.conceptualDepth

	def updateExternalStrength(self):
		self.externalStrength = (self.localSupport() + self.descriptionType.activation) / 2

	def localSupport(self):
		from workspace import workspace
		supporters = 0 # number of objects in the string with a descriptionType like self
		for other in workspace.otherObjects(self.object):
			if not ( self.object.isWithin(other) or other.isWithin(self.object) ):
				for description in other.descriptions:
					if description.descriptionType == self.descriptionType:
						supporters += 1
		results = { 0:0.0, 1:20.0, 2:60.0, 3:90.0 }
		if supporters in results:
			return results[supporters]
		return 100.0

	def build(self):
		self.descriptionType.buffer = 100.0
		self.descriptor.buffer = 100.0
		if not self.object.hasDescription(self.descriptor):
			logging.info('Add %s to descriptions' % self)
			self.object.descriptions += [ self ]

	def breakDescription(self):
		from workspace import workspace
		if self in workspace.structures:
			workspace.structures.remove(self)
		self.object.descriptions.remove(self)