// Pin definitions
const int potPin = A0;      // Analog pin for potentiometer
const int relayPin1 = 2;    // Digital pin for the first relay module
const int relayPin2 = 8;    // Digital pin for the second relay module
const int button1Pin = 3;   // Digital pin for button 1
const int button2Pin = 4;   // Digital pin for button 2
const int button3Pin = 5;   // Digital pin for button 3

// Variables to store the previous state of each button
int button1State = HIGH;
int button2State = HIGH;
int button3State = HIGH;

// Variables for toggle functionality
bool toggleActive = false;
unsigned long toggleStartTime = 0;
int interval = 0; // Initial interval value

void setup() {
  pinMode(potPin, INPUT);
  pinMode(relayPin1, OUTPUT);
  pinMode(relayPin2, OUTPUT);
  pinMode(button1Pin, INPUT_PULLUP);
  pinMode(button2Pin, INPUT_PULLUP);
  pinMode(button3Pin, INPUT_PULLUP);
}

void loop() {
  // Read potentiometer value
  int potValue = analogRead(potPin);

  // Map potentiometer value (0-1023) to time interval (100-2000 ms)
  interval = map(potValue, 0, 1023, 100, 2000);

  // Check button states
  if (buttonStateChanged(button1Pin, &button1State)) {
    toggleActive = false;
    digitalWrite(relayPin1, LOW);
    digitalWrite(relayPin2, LOW); // Turn off the second relay
  } else if (buttonStateChanged(button2Pin, &button2State)) {
    toggleActive = false;
    digitalWrite(relayPin1, HIGH);
    digitalWrite(relayPin2, HIGH); // Turn on the second relay
  } else if (buttonStateChanged(button3Pin, &button3State)) {
    toggleActive = true;
    toggleStartTime = millis();
  }

  // Toggle functionality
  if (toggleActive) {
    if (millis() - toggleStartTime >= interval) {
      digitalWrite(relayPin1, !digitalRead(relayPin1)); // Toggle relay state
      digitalWrite(relayPin2, digitalRead(relayPin1));  // Mirror the state on the second relay
      toggleStartTime = millis(); // Reset toggle timer
    }
  }
}

// Function to check button state change
bool buttonStateChanged(int pin, int *lastState) {
  int currentState = digitalRead(pin);
  if (currentState != *lastState) {
    delay(50); // Debounce delay
    currentState = digitalRead(pin);
    if (currentState != *lastState) {
      *lastState = currentState;
      return currentState == LOW;
    }
  }
  return false;
}