import random
import uuid
from units import rat, bomb

class UnitManager:        
    def count_rats(self):
        count = 0
        for unit in self.units.values():
            if isinstance(unit, rat.Rat):
                count += 1
        return count
            
    def spawn_rat(self, position=None):
        if position is None:
            position = self.choose_start()
        rat_class = rat.Male if random.random() < 0.5 else rat.Female
        self.spawn_unit(rat_class, position)
        
    def spawn_bomb(self, position):
        self.spawn_unit(bomb.Timer, position)

    def spawn_unit(self, unit, position, **kwargs):
        id = uuid.uuid4()
        self.units[id] = unit(self, position, id, **kwargs)
        
    def choose_start(self):
        if not hasattr(self, '_valid_positions'):
            self._valid_positions = [
                (x, y) for y in range(1, self.map.height-1) 
                for x in range(1, self.map.width-1) 
                if self.map.matrix[y][x]
            ]
        return random.choice(self._valid_positions)