#include <Arduino.h>  // not needed in Arduino IDE but included for clarity

// Pin definitions
const int led1Pin = 8;
const int led2Pin = 9;
const int btn1Pin = 22; // Toggle led1
const int btn2Pin = 23; // Toggle led2
const int btn3Pin = 24; // Reset both to OFF

// Variables to store the LED states (false = OFF, true = ON)
bool led1State = false;
bool led2State = false;

// Debounce delay (ms)
const unsigned long debounceDelay = 150;
// Stable delay after an action (ms)
const unsigned long stableDelay = 2000;

void setup() {
  // Initialize LED pins as outputs 
  pinMode(led1Pin, OUTPUT);
  pinMode(led2Pin, OUTPUT);
  
  // Ensure LEDs start off
  digitalWrite(led1Pin, LOW);
  digitalWrite(led2Pin, LOW);
  
  // Initialize button pins as input with internal pullup enabled.
  pinMode(btn1Pin, INPUT_PULLUP);
  pinMode(btn2Pin, INPUT_PULLUP);
  pinMode(btn3Pin, INPUT_PULLUP);
}

void loop() {
  // Check button 1 (toggle led1)
  if (digitalRead(btn1Pin) == LOW) { // button pressed?
    delay(debounceDelay); // debounce
    if (digitalRead(btn1Pin) == LOW) {  // still low after debounce?
      // Toggle LED1 state
      led1State = !led1State;
      digitalWrite(led1Pin, led1State ? HIGH : LOW);
      
      // Wait for the LED state to remain stable for 2 seconds
      delay(stableDelay);
      
      // Wait until the user releases the button to avoid repeat toggling
      while(digitalRead(btn1Pin) == LOW) {
        // do nothing, waiting for release
      }
      delay(debounceDelay); // additional debounce after release
    }
  }
  
  // Check button 2 (toggle led2)
  if (digitalRead(btn2Pin) == LOW) { // button pressed?
    delay(debounceDelay); // debounce
    if (digitalRead(btn2Pin) == LOW) {  // check confirmed low
      // Toggle LED2 state
      led2State = !led2State;
      digitalWrite(led2Pin, led2State ? HIGH : LOW);
      
      // Wait for the LED state to remain stable for 2 seconds
      delay(stableDelay);
      
      // Wait until the button is released
      while(digitalRead(btn2Pin) == LOW) {
        // wait
      }
      delay(debounceDelay); // post-release debounce
    }
  }
  
  // Check button 3 (reset both LEDs to off)
  if (digitalRead(btn3Pin) == LOW) { // pressed?
    delay(debounceDelay);  // debounce
    if (digitalRead(btn3Pin) == LOW) {
      // Reset both LEDs to off
      led1State = false;
      led2State = false;
      digitalWrite(led1Pin, LOW);
      digitalWrite(led2Pin, LOW);
      
      // Maintain off state for 2 seconds
      delay(stableDelay);
      
      // Wait until button released
      while(digitalRead(btn3Pin) == LOW) {
        // wait for release
      }
      delay(debounceDelay);
    }
  }
}