import pgzrun
import os
import random

alien = Actor('alien')
alien.topright = 0, 10

WIDTH = 500
HEIGHT = 500

score = 0
direction = 0

def draw():
    screen.clear()
    alien.draw()
    screen.draw.text("Skóre: "+str(score),(10,10),color="white")

def update():
    global direction
    if direction == 0:
        alien.left += 2
        if alien.left > WIDTH:
            pick_direction()
            set_alien_to_proper_start()
    if direction == 1:
        alien.left -= 2
        if alien.right < 0:
            pick_direction()
            set_alien_to_proper_start()
    if direction == 2:
        alien.top += 2
        if alien.top > HEIGHT:
            pick_direction()
            set_alien_to_proper_start()
    if direction == 3:
        alien.top -= 2
        if alien.bottom < 0:
            pick_direction()
            set_alien_to_proper_start()

def pick_direction():
    global direction
    direction = random.randint(0,3)

def set_alien_to_proper_start():
    global direction
    if direction == 0:
        alien.right = 0
        alien.top = random.randint(1,HEIGHT - alien.height)
    if direction == 1:
        alien.left = WIDTH
        alien.top = random.randint(1,HEIGHT - alien.height)
    if direction == 2:
        alien.bottom = 0
        alien.left = random.randint(1,WIDTH - alien.width)
    if direction == 3:
        alien.top = HEIGHT
        alien.left = random.randint(1,WIDTH - alien.width)


def on_mouse_down(pos):
    if alien.collidepoint(pos):
        set_alien_hurt()
        apply_score()
    else:
        miss()

def set_alien_hurt():
    alien.image = 'alien_hurt'
    sounds.eep.play()
    clock.schedule_unique(set_alien_normal, 1.0)

def set_alien_normal():
    alien.image = 'alien'

def miss():
    global score
    score -= 1 if score!=0 else 0

def apply_score():
    global score
    score += 1

pgzrun.go()