'''
Mission 6: Heartbeat
Medium Remix - 2nd option
Pixels flash in order for a cycle
-- Also adds another if statement with a break
'''
from codex import *
from time import sleep

delay = 1

while True:
    # one cycle
    pixels.set(3, BLACK)
    pixels.set(0, BLUE)
    sleep(delay)
    pixels.set(0, BLACK)
    pixels.set(1, RED)
    sleep(delay)
    pixels.set(1, BLACK)
    pixels.set(2, GREEN)
    sleep(delay)
    pixels.set(2, BLACK)
    pixels.set(3, PURPLE)
    sleep(delay)

    if buttons.was_pressed(BTN_A):
        delay = delay + 0.2

    if buttons.was_pressed(BTN_B):
        delay = delay - 0.2

    if buttons.was_pressed(BTN_D):
        break