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import sys

"""
Formula to simulate price change in a stock market
"""


class PriceChange(object):

	def __init__(self, buy_shares, sell_shares, owned_shares, price):
		assert owned_shares
		assert price
		assert sell_shares <= owned_shares
		self.buy_shares = buy_shares
		self.sell_shares = sell_shares
		if self.buy_shares == self.sell_shares:
			self.price_change = 0.0
			return
		self.owned_shares = owned_shares
		self.price = price
		self.start_price = price
		self.bs_ratio = self.buy_shares / self.sell_shares
		self.price *= self.bs_ratio
		self.price_change = self.price - self.start_price


	def __repr__(self):
		return str(self.__dict__)

if __name__ == '__main__':
	print(PriceChange(40, 10, 500, 40.5))
	print(PriceChange(40, 400, 500, 40.8))
	print(PriceChange(4, 1, 50, 50.0))
	print(PriceChange(4432, 7584, 50032, 50.0))
	print(PriceChange(3200, 2000, 7000, 100.0))
	print("for splunk stock")
	print(PriceChange(500000, 510000, 1014000, 123.56))
	print("regular examples")
	print(PriceChange(43000, 39400, 101423, 120.7))