'''
Mission 10 - Reaction Tester
The program uses the computer clock to calculate the
reaction time. After the pixels are lit, the player is
timed on how long it takes to press a button.
Concepts learned: 
    using the computer clock (sleep, ticks_ms and ticks_diff)
    clearing the screen and turning pixels off
    using a list to turn on all pixels with a single command
    writing a function to 
'''

from codex import *
import random
import time

def wait_button():
    while True:
        if buttons.was_pressed(BTN_A):
            break
while True:
    display.print("Press Button A")
    wait_button()

    # clear screen and 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()

    # get random delay time
    my_number = random.randrange(100, 500)
    delay_time = ms / 1000
    time.sleep(delay_time)

    # turn pixels GREEN
    buttons.was_pressed(BTN_A)
    pixels.set([GREEN, GREEN, GREEN, GREEN])

    # get start and end time
    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")