from machine import Pin
from time import sleep

# Wait for USB to become ready
sleep(0.1)

print("Practice 2: Multi-Smart Toggle Started")

# --- Configuration ---
# Define pairs of GPIO pins: [LED_Pin, Button_Pin]
# You can add as many pairs here as you like!
config_pairs = [
    [15, 16],  # Pair 1 (Original)
    [14, 17],  # Pair 2
    [13, 18]   # Pair 3
]

# --- Setup Lists ---
led_objects = []
button_objects = []
led_states = []
prev_button_states = []

# Initialize all pins using a loop
for pair in config_pairs:
    # Setup LED
    led = Pin(pair[0], Pin.OUT)
    led_objects.append(led)
    led_states.append(0) # Start OFF
    
    # Setup Button
    btn = Pin(pair[1], Pin.IN, Pin.PULL_DOWN)
    button_objects.append(btn)
    prev_button_states.append(0) # Track previous state for edge detection

print(f"System ready with {len(config_pairs)} switch pairs.")

# --- Main Loop ---
while True:
    # Loop through every pair defined in our configuration
    for i in range(len(config_pairs)):
        
        current_btn_val = button_objects[i].value()
        
        # Check for "Rising Edge" (Button went from 0 to 1)
        # This replaces the blocking 'while' loop
        if current_btn_val == 1 and prev_button_states[i] == 0:
            
            # Toggle the state
            led_states[i] = not led_states[i]
            
            # Update the hardware
            led_objects[i].value(led_states[i])
            
            print(f"Pair {i+1} (LED GP{config_pairs[i][0]}) toggled to {int(led_states[i])}")
        
        # Update the previous state tracker for the next loop iteration
        prev_button_states[i] = current_btn_val

    # Small delay to prevent CPU overload and handle minor bouncing
    sleep(0.05)