vyper betting app

bet.vy

a_addr: public(address)
b_addr: public(address)
oracle_addr: public(address)
bet_price: public(wei_value)
a_stake: public(wei_value)
b_stake: public(wei_value)

@public
def __init__(user_a: address, user_b: address, oracle: address, require_wei: wei_value):
    self.a_addr = user_a
    self.b_addr = user_b
    self.oracle_addr = oracle
    self.bet_price = require_wei
    
    self.a_stake = 0
    self.b_stake = 0

@public
@payable
def __default__():
    if (msg.sender == self.a_addr):
        self.a_stake = self.a_stake + msg.value
    if (msg.sender == self.b_addr):
        self.b_stake = self.b_stake + msg.value

@private
def send_stake(winner: address):
    send(winner, self.a_stake + self.b_stake)
    self.a_stake = 0
    self.b_stake = 0

@public
def execute_oracle(winner: address):
    assert msg.sender == self.oracle_addr
    
    if (self.bet_price <= self.a_stake and self.bet_price <= self.b_stake):
        if (winner == self.a_addr):
            self.send_stake(winner)
        if (winner == self.b_addr):
            self.send_stake(winner)
        return
    
    if (self.bet_price <= self.a_stake):
        self.send_stake(self.a_addr)
    if (self.bet_price <= self.b_stake):
        self.send_stake(self.b_addr)