'''
Mission 10 - Reaction Time
through Objective 6
'''
from codex import *
import time
import random

def countdown():
    display.clear()

    pixels.set([BLACK, BLACK, BLACK, BLACK])

    display.print(3, scale=6)
    time.sleep(1)
    display.print(2, scale=6)
    time.sleep(1)
    display.print(1, scale=6)
    time.sleep(1)
    display.clear()

def wait_button():
    while True:
        if buttons.was_pressed(BTN_A):
            break

# -- Main Program --
while True:
    display.print("Press Button A")
    wait_button()
    countdown()

    delay_time = random.randrange(1000, 5000) / 1000
    time.sleep(delay_time)
    pixels.set([GREEN, GREEN, GREEN, GREEN])
    start_time = time.ticks_ms()

    wait_button()
        
    end_time = time.ticks_ms()
    reaction_time = time.ticks_diff(end_time, start_time)

    display.print("Reaction Time:")
    display.print(reaction_time)
    display.print("milliseconds")