from machine import Pin, Timer
import time
import random

# --------- Settings ---------
MIN_WAIT_MS = 2000      # minimum random wait
MAX_WAIT_MS = 5000      # maximum random wait
DEBOUNCE_MS = 200       # button debounce

LED_PIN = 2
BUTTON_PIN = 14

# --------- Hardware Setup ---------
led = Pin(LED_PIN, Pin.OUT)
button = Pin(BUTTON_PIN, Pin.IN, Pin.PULL_UP)

# --------- State Variables ---------
last_press = 0
game_active = False          # waiting for player reaction
request_start = False       # start game request
reaction_start = 0

# Timer for delayed LED start
t_start = Timer(0)

# --------- Interrupt Function ---------
def button_pressed(pin):
    global last_press, game_active
    now = time.ticks_ms()

    if time.ticks_diff(now, last_press)> DEBOUNCE_MS:
        #Check game active
        if game_active:
            reaction_time = time.ticks_diff(now, reaction_start)
            print("reaction time: ", reaction_time)
            led.off()
            game_active = False
            print("get ready for next round")
            start_game()
            last_press = now


# --------- Timer Callback ---------

def led_on(timer):
    global game_active, reaction_start
    led.on()
    game_active = True
    reaction_start = time.ticks_ms()
    print("PRESS NOW")

# --------- Helper Function ---------
def start_game():
    wait_time = random.randint(MIN_WAIT_MS, MAX_WAIT_MS)
    print("Wait for the led....")
    t_start.init(
        period = wait_time,
        mode = Timer.ONE_SHOT,
        callback = led_on
    )


# Attach interrupt
button.irq(trigger = Pin.IRQ_FALLING,handler = button_pressed)

# --------- Main Program ---------
print("Reaction Time Game Started")
print("Press button ONLY when LED turns on")
start_game()

while True:
    # main loop stays free
    time.sleep_ms(10)