#include <EEPROM.h>

const int ledPin1 = 9;
const int ledPin2 = 10;
const int buttonPinIncrease = 2;
const int buttonPinDecrease = 3;

int duration = 1000; // Initial duration in milliseconds
int eepromAddress = 0; // Address to store the duration in EEPROM

unsigned long lastChangeTime = 0;
bool led1State = false;
bool buttonIncreasePressed = false;
bool buttonDecreasePressed = false;

void setup() {
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(buttonPinIncrease, INPUT_PULLUP);
  pinMode(buttonPinDecrease, INPUT_PULLUP);
  
  // Read the saved duration from EEPROM
  duration = EEPROM.read(eepromAddress) * 100; // Scale back from 10ms units to ms
  if (duration <= 0 || duration > 10000) {
    duration = 1000; // Default duration if EEPROM is invalid
  }

  Serial.begin(9600);
  Serial.print("Initial Duration: ");
  Serial.println(duration);
}

void loop() {
  // Read button states
  bool increaseButtonState = digitalRead(buttonPinIncrease) == LOW;
  bool decreaseButtonState = digitalRead(buttonPinDecrease) == LOW;

  // Handle increase button
  if (increaseButtonState && !buttonIncreasePressed) {
    duration += 100; // Increase duration by 100ms
    if (duration > 10000) {
      duration = 10000; // Limit max duration to 10 seconds
    }
    EEPROM.write(eepromAddress, duration / 100); // Save duration in 10ms units
    Serial.print("Increased Duration: ");
    Serial.println(duration);
  }
  buttonIncreasePressed = increaseButtonState;

  // Handle decrease button
  if (decreaseButtonState && !buttonDecreasePressed) {
    duration -= 100; // Decrease duration by 100ms
    if (duration < 100) {
      duration = 100; // Limit min duration to 100ms
    }
    EEPROM.write(eepromAddress, duration / 100); // Save duration in 10ms units
    Serial.print("Decreased Duration: ");
    Serial.println(duration);
  }
  buttonDecreasePressed = decreaseButtonState;

  // Blink LEDs sequentially
  unsigned long currentTime = millis();
  if (currentTime - lastChangeTime >= duration) {
    lastChangeTime = currentTime;
    led1State = !led1State;
    digitalWrite(ledPin1, led1State ? HIGH : LOW);
    digitalWrite(ledPin2, led1State ? LOW : HIGH);

  }
}