import machine
import neopixel
import time

np = neopixel.Neopixel(16, 0, 6, "GRB")
button = machine.Pin(27, machine.Pin.IN, machine.Pin.PULL_UP)
    
def ringFlash(np):
    n = np.num_leds
    print(n)
    #clear
    for i in range(n):
        np[i] = (0, 0, 0)
    np.show()  
    print("Cleared...") 
    #chase
    print("Attempting light ring...")
    
    for i in range(n):
        for j in range(n):
            np.rotate_right
        np[i % n] = (0, 0, 255)
        np[i % n-1] = (0, 0, 200)
        np[i % n-2] = (0, 0, 128)
        np[i % n-3] = (0, 0, 0)
        np.show()
        time.sleep_ms(20)
    #clear
    for i in range(n):
        np[i] = (0, 0, 0)
    np.show()
    print("...done.")

#main
np[1] = (255,0,0)
np.show()
print("Hello, Pi Pico!")
#look for a trigger (will be the RFID later)
while True:
    if not button.value():
        print("Button pressed!")
        for k in np.pixels:
            ringFlash(np)
     
    time.sleep(0.1)