import random
import uuid
from units import rat, bomb, mine

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):
        if self.ammo["bomb"]["count"] <= 0:
            return
        self.render_engine.play_sound("PUTDOWN.WAV")
        self.spawn_unit(bomb.Timer, position)
        self.ammo["bomb"]["count"] -= 1

    def spawn_nuclear_bomb(self, position):
        """Spawn a nuclear bomb at the specified position"""
        if self.ammo["nuclear"]["count"] <= 0:
            return
        if self.map.is_wall(position[0], position[1]):
            return
        self.render_engine.play_sound("NUCLEAR.WAV")
        self.ammo["nuclear"]["count"] -= 1
        self.spawn_unit(bomb.NuclearBomb, position)
        
    def spawn_mine(self, position):
        if self.ammo["mine"]["count"] <= 0:
            return
        if self.map.is_wall(position[0], position[1]):
            return
        self.render_engine.play_sound("PUTDOWN.WAV")
        self.ammo["mine"]["count"] -= 1
        self.spawn_unit(mine.Mine, position, on_bottom=True)

    def spawn_unit(self, unit, position, on_bottom=False, **kwargs):
        id = uuid.uuid4()
        if on_bottom:
            self.units = {id: unit(self, position, id, **kwargs), **self.units}
        else:
            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)
