from time import sleep
from random import binomialvariate

DISPLAY = "display"
SENSOR = "sensor"
ZIGBEE = "zigbee"
LABELS = {DISPLAY, SENSOR, ZIGBEE}

time = 0

transactions  = []
active_transaction = None
slice_labels = {l: "" for l in LABELS}

def display():
    if time % 5 == 1:
        transactions.append((DISPLAY, 4 if binomialvariate(p=0.15) else 2, 50))

def sensor():
    if time % 5 == 0:
        transactions.append((SENSOR, 1, 10))

def zigbee():
    if time % 15 == 14:
        transactions.append((ZIGBEE, 10, 100))

print(' '*5, *(l[0] for l in LABELS))
while True:

    display()
    sensor()
    zigbee()

    if active_transaction is None and transactions:
        active_transaction = min(transactions, key=lambda t: t[2])
        transactions.remove(active_transaction)

    print(f"t={time:02}: ", end="")
    if active_transaction is not None:
        label, duration, priority = active_transaction
        print(*('x' if l == label else '#' if any(t[0]==l for t in transactions) else ' ' for l in LABELS))

        active_transaction = (label, duration-1, priority) if duration > 1 else None
        transactions = [(l, d, p*0.8) for (l, d, p) in transactions]
    else:
        print("   ")

    time += 1
    sleep(1)