Добавление кулдауна при выстреле

Хотел добавить кулдаун при выстреле класса snaryad1 но ничего не получалось, помогите пожалуйста... вообще не имею понятия как работать с time и cooldown

pygame.init()
win = pygame.display.set_mode((1000, 600))

pygame.display.set_caption("Runner")



walkRight = [pygame.image.load('1_nright.png'), pygame.image.load('1_nright.png'),pygame.image.load('1_nright.png'),pygame.image.load('1_nright.png'),pygame.image.load('1_nright.png'),pygame.image.load('1_nright.png')]

walkLeft = [pygame.image.load("1_nleft.png"), pygame.image.load("1_nleft.png"),pygame.image.load("1_nleft.png"),pygame.image.load("1_nleft.png"),pygame.image.load("1_nleft.png"),pygame.image.load("1_nleft.png")]
            
swordAttackright = [pygame.image.load("sword_atack1.png"),pygame.image.load("sword_atack2.png"),pygame.image.load("sword_atack3.png"),pygame.image.load("sword_atack4.png"),pygame.image.load("sword_atack5.png"),pygame.image.load("sword_atack6.png")]

jump = pygame.image.load("jump.png")

playerStand = pygame.image.load("nstay.png")

monu1 = pygame.image.load("bg.png")

clock = pygame.time.Clock()

x = 50
y = 430
width = 60
height = 71
speed = 15
isSword = False
swordCount = 10
isJump = False
jumpCount = 10
score = 0
attack = False
left = False
up = False
down = False
right = False
animCount = 0
lastMove = "right"


WHITE = (255, 255, 255)
BLACK = (0, 0, 0)
RED = (255, 0, 0)
GREEN = (0, 255, 0)
BLUE = (0, 0, 255)

class Player(object):
    def __init__(self,x,y,width,height):
        self.x = x
        self.y = y
        self.width = width
        self.height = height
        self.vel = 5
        self.isJump = False
        self.left = False
        self.right = False
        self.walkCount = 0
        self.jumpCount = 10
        self.standing = True
        self.hitbox = (self.x + 20, self.y, 28, 60)
        self.health = 10
        self.visible = True
        
    def draw(self, win):
        if self.visible:
            if self.walkCount + 1 >= 30:
                self.walkCount = 0

        if not(self.standing):
            if self.left:
                win.blit(walkLeft[self.walkCount//3], (self.x,self.y))
                self.walkCount += 1
            elif self.right:
                win.blit(walkRight[self.walkCount//3], (self.x,self.y))
                self.walkCount +=1
        else:
            if self.right:
                win.blit(char, (self.x,self.y))
            else:
                win.blit(walkRight[0], (self.x, self.y))
        self.hitbox = (self.x + 0, self.y + 0,44,66)

class snaryad1():
    def __init__(self, x , y , radius, color, facing):
        self.x = x
        self.y = y
        self.radius = radius
        self.color = color
        self.facing = facing
        self.vel = 15 * facing
    def draw(self, win):
        pygame.draw.circle(win, self.color, (self.x, self.y), self.radius)
class snaryad():
    def __init__(self, x , y , radius, color, facing):
        self.x = x
        self.y = y
        self.radius = radius
        self.color = color
        self.facing = facing
        self.vel = 15 * facing
    def draw(self, win):
        pygame.draw.circle(win, self.color, (self.x, self.y), self.radius)
        
class enemy(object):
    walkRight = [pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png")]
    walkLeft = [pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png"),pygame.image.load("gobling.png")]
    def __init__(self, x, y, width, height, end):
        self.x = x / 2
        self.y = y / 2
        self.width = width
        self.height = height
        self.end = end
        self.path = [self.x, self.end,self.y,self.end]
        self.walkCount = 0
        self.vel = 3
        self.health = 10
        self.hitbox = (self.x , self.y , 0, 0)
        self.visible = True
        
    def draw(self, win):
        self.move()
        if self.visible:
            if self.walkCount + 1 >= 33:
                self.walkCount = 0
            
        if self.vel > 0:
            win.blit(self.walkRight[self.walkCount // 20], (self.x, self.y))
            self.walkCount += 1
        else:
            win.blit(self.walkLeft[self.walkCount // 20], (self.x, self.y))
            self.walkCount += 1
            
        pygame.draw.rect(win, (128,0,0), (self.hitbox[0], self.hitbox[1] - 20, 70, 10))
        pygame.draw.rect(win, (0,255,0), (self.hitbox[0], self.hitbox[1] - 20, 70 -(7 * (10 - self.health)), 10))
        if self.health == 0:
            self.health = 10
        self.hitbox = (self.x + 0, self.y + 0,44,66)

    def move(self):
        if self.vel > 0:
            if self.x + self.vel < self.path[1]:
                self.x += self.vel
            else:
                self.vel = self.vel * -1
                self.walkCount = 0
        else:
            if self.x - self.vel > self.path[0]:
                self.x += self.vel
            else:
                self.vel = self.vel * -1
                self.walkCount = 0

    def hit(self):
        if self.health > 0:
            self.health -= 1
        else:
            self.visible = False
        print("you hit negr")
                
def drawWindow():
    global animCount
    win.blit(monu1, (0, 0))
    goblin.draw(win)
    text = font.render(" SCORE " + str(score),1, (0,0,0))
    win.blit(text,(390,10))

    if animCount + 1 >= 30:
        animCount = 0

    if left:
        win.blit( walkLeft[animCount // 5], (x, y) )
        animCount += 1
    elif right:
        win.blit( walkRight[animCount // 5], (x, y) )
        animCount += 1
    else:
        win.blit(playerStand, (x, y))

    for bullet in bullets:
        bullet.draw(win)
    
    pygame.display.update()

player = Player(50, 430, 64,64)
font = pygame.font.SysFont("comicsans", 30, True)
run = True
bullets = []
goblin = enemy(200, 300, 64, 64, 1000 - width )

while run:
    clock.tick(30)
    
    for event in pygame.event.get():
            
        if event.type == pygame.QUIT:
            run = False
            
    for bullet in bullets:
        if bullet.y - bullet.radius < goblin.hitbox[1] + goblin.hitbox[3] and bullet.y + bullet.radius > goblin.hitbox[1]:
            if bullet.x + bullet.radius > goblin.hitbox[0] and bullet.x - bullet.radius < goblin.hitbox[0] + goblin.hitbox[2]:
                goblin.hit()
                score += 1
                bullets.pop(bullets.index(bullet))
                
        if bullet.x < 1000 and bullet.x > 0:
            bullet.x += bullet.vel
        else:
            bullets.pop(bullets.index(bullet))

    
    keys = pygame.key.get_pressed()
    if keys[pygame.K_z]:
            if lastMove == "right":
                facing = 1
            else:
                facing = -1
            if len(bullets) < 5:
                bullets.append(snaryad1(round(x + width // 2 ), round(y + height // 2 + 10), 5, (255,0,0),facing))
                bullets.append(snaryad1(round(x + width // 2 ), round(y + height // 2 - 10), 5, (255,0,0),facing))
            
    if event.type == pygame.MOUSEBUTTONDOWN:
        if lastMove == "right":
            facing = 1
        else:
            facing = -1
        if len(bullets) < 5:
            bullets.append(snaryad(round(x + width // 2), round(y + height // 2), 5, (255, 0, 0), facing))
    if keys[pygame.K_q] and x < 1000 - width - 5:
        x += speed * 2.5
    if keys[pygame.K_e] and x > 5:
        x -= speed * 2.5
    if keys[pygame.K_w] and y > 5:
        y -= speed
    if keys[pygame.K_s] and y < 600 - height -5:
        y += speed
    if keys[pygame.K_a] and x > 5:
        x -= speed
        left = True
        right = False
        lastMove = "left"
    elif keys[pygame.K_d] and x < 1000 - width - 5:
        x += speed
        left = False
        right = True
        lastMove = "right"
    else:
        left = False
        right = False
        animCount = 0
                
    if not(isJump):
        if keys[pygame.K_SPACE]:
            isJump = True
    else:
        if jumpCount >= -10:
            if jumpCount < 0:
                y += (jumpCount ** 2) / 2
            else:
                y -= (jumpCount ** 2) / 2
            jumpCount -= 1
        else:
            isJump = False
            jumpCount = 10
    if keys[pygame.K_f]:
        attack = True
    else:
        if swordCount >= -10:
            if swordCount < 0:
                y = y
                x = x
            else:
                attack = False
            
    drawWindow()

pygame.quit()```