from asteroid import Asteroid

class Bullet:
    """A bullet fired by the spaceship that moves upward and destroys asteroids."""
    character = '|'

    def __init__(self, position):
        self.position = position

    def play_turn(self, game):
        # Move bullet up one row each turn
        x, y = self.position
        y -= 1

        # If the bullet goes off the top, remove it
        if y < 0:
            game.remove_agent(self)
            return

        self.position = (x, y)

        # Check if we hit an asteroid
        # We loop over a copy of the agents list because we may remove agents
        for agent in list(game.agents):
            if isinstance(agent, Asteroid) and agent.position == self.position:
                # Destroy the asteroid and the bullet
                game.remove_agent(agent)
                game.remove_agent(self)
                # Reward points for hitting an asteroid
                game.state["score"] += 10
                return
    #here