import formulas

class WorkspaceStructure(object):
	def __init__(self):
		self.string = None
		self.internalStrength = 0.0
		self.externalStrength = 0.0
		self.totalStrength = 0.0

	def updateStrength(self):
		self.updateInternalStrength()
		self.updateExternalStrength()
		self.updateTotalStrength()

	def updateTotalStrength(self):
		"""Recalculate the total strength based on internal and external strengths"""
		weights = ( (self.internalStrength, self.internalStrength), (self.externalStrength, 100 - self.internalStrength) )
		strength = formulas.weightedAverage(weights)
		self.totalStrength = strength

	def totalWeakness(self):
		"""The total weakness is derived from total strength"""
		return 100 - self.totalStrength ** 0.95

	def updateInternalStrength(self):
		"""How internally cohesive the structure is"""
		raise NotImplementedError, 'call of abstract method: WorkspaceStructure.updateInternalStrength()'

	def updateExternalStrength(self):
		raise NotImplementedError, 'call of abstract method: WorkspaceStructure.updateExternalStrength()'

	def break_the_structure(self):
		"""Break this workspace structure

		Exactly what is broken depends on sub-class
		"""
		raise NotImplementedError, 'call of abstract method: WorkspaceStructure.break_the_structure()'