#include <Servo.h>  // Included as allowed (unused in this example)

const int btnPin1 = 22;
const int btnPin2 = 23;
const int btnPin3 = 24;

const int ledPin1 = 44; // PWM-capable pin
const int ledPin2 = 45; // PWM-capable pin
const int ledPin3 = 46; // PWM-capable pin

const int potPin1 = A0;
const int potPin2 = A1;
const int potPin3 = A2;

const unsigned long stableDelay = 2000;      // 2 seconds stable period
const unsigned long debounceDelay = 50;        // 50 ms debounce delay

// To track the last time each LED was updated
unsigned long lastUpdate1 = 0;
unsigned long lastUpdate2 = 0;
unsigned long lastUpdate3 = 0;

// To save the last button states for edge detection
int lastButtonState1 = HIGH;
int lastButtonState2 = HIGH;
int lastButtonState3 = HIGH;

void setup() {
  // Initialize LED pins as outputs; start with LEDs off
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(ledPin3, OUTPUT);
  analogWrite(ledPin1, 0);
  analogWrite(ledPin2, 0);
  analogWrite(ledPin3, 0);

  // Initialize button pins as INPUT_PULLUP
  pinMode(btnPin1, INPUT_PULLUP);
  pinMode(btnPin2, INPUT_PULLUP);
  pinMode(btnPin3, INPUT_PULLUP);
}

void loop() {
  unsigned long currentTime = millis();

  // Process Button 1 for led1
  int reading1 = digitalRead(btnPin1);
  if (reading1 == LOW && lastButtonState1 == HIGH) {
    // Wait a little to debounce
    delay(debounceDelay);
    // Only update if 2 seconds have passed since last update for led1
    if (currentTime - lastUpdate1 >= stableDelay) {
      int potValue = analogRead(potPin1);
      int brightness = map(potValue, 0, 1023, 0, 255);
      analogWrite(ledPin1, brightness);
      lastUpdate1 = millis();
    }
  }
  lastButtonState1 = reading1;

  // Process Button 2 for led2
  int reading2 = digitalRead(btnPin2);
  if (reading2 == LOW && lastButtonState2 == HIGH) {
    delay(debounceDelay);
    if (currentTime - lastUpdate2 >= stableDelay) {
      int potValue = analogRead(potPin2);
      int brightness = map(potValue, 0, 1023, 0, 255);
      analogWrite(ledPin2, brightness);
      lastUpdate2 = millis();
    }
  }
  lastButtonState2 = reading2;

  // Process Button 3 for led3
  int reading3 = digitalRead(btnPin3);
  if (reading3 == LOW && lastButtonState3 == HIGH) {
    delay(debounceDelay);
    if (currentTime - lastUpdate3 >= stableDelay) {
      int potValue = analogRead(potPin3);
      int brightness = map(potValue, 0, 1023, 0, 255);
      analogWrite(ledPin3, brightness);
      lastUpdate3 = millis();
    }
  }
  lastButtonState3 = reading3;
  
  // No further action is needed if no button is pressed.
  // The current brightness levels continue displayed.
}