#!/usr/bin/python3

from util.io import readvalue

def positive_float(v):
	x = float(v)
	if(x <= 0):
		raise ValueError("{} is a non-positive float".format(v))
	return x


class Circle(object):
	__slots__ = ["x", "y", "radius"]

	def __init__(self, x, y, radius):
		self.x = x
		self.y = y
		self.radius = radius

	def has_intersection(self, other):
		if(not isinstance(other, Circle)):
			raise TypeError("cannot calculate intersection of Circle and {}".format(type(other)))

		distance = ((self.x - other.x)**2 + (self.y - other.y)**2)**0.5
		if(distance < self.radius + other.radius):
			return True
		return False

	def __contains__(self, other):
		if(not isinstance(other, Circle)):
			raise TypeError("cannot calculate wether {} is in Circle".format(type(other)))

		distance = ((self.x - other.x)**2 + (self.y - other.y)**2)**0.5

		if(other.radius + distance < self.radius):
			return True
		return False
	
	@staticmethod
	def read_Circle():
		radius = readvalue("radius> ", positive_float)
		x = readvalue("x> ", float)
		y = readvalue("y> ", float)

		return Circle(x, y, radius)


if( __name__ == "__main__"):
	print("Create Circle 1:")
	c1 = Circle.read_Circle()
	print("Create Circle 2:")
	c2 = Circle.read_Circle()

	print("\n")

	if(c1.has_intersection(c2)):
		print("The two circles have an intersection.")
	else:
		print("The two circles have no intersection.")

	if(c2 in c1):
		print("Circle 1 contains Circle 2")
	if(c1 in c2):
		print("Circle 2 contains Circle 1")