//Declare pins

int led1=2;
int led2=3;
int led3=4;
int button1=5;
int speedUpButton=6;
int speedDownButton=7;
bool ledState = false;
bool buttonState1 = false;
int button4=8;
int brightness = 0;
int fadeAmount = 5;
bool buttonState = false;
bool lastButtonState = false;

const int MIN_BLINK_SPEED = 50;
const int MAX_BLINK_SPEED = 1000;

// Initial blink speed
int blinkSpeed = 500;

void setup() {
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(button1, INPUT);
  pinMode(speedUpButton, INPUT);
  pinMode(speedDownButton, INPUT);
  pinMode(button4, INPUT);
}


void loop() {
  // button 1
  buttonState = digitalRead(button1);

  // Check if the button is pressed (LOW)
  if (buttonState == HIGH) {
    // Check the current state of the LED
    if (ledState == LOW) {
      // If the LED is currently off, turn it on
      digitalWrite(led1, HIGH);
      // Update the LED state variable to reflect the change
      ledState = true;
    } else {
      // If the LED is currently on, turn it off
      digitalWrite(led1, LOW);
      // Update the LED state variable to reflect the change
      ledState = false;
    }
  }

  //button 4
  buttonState = digitalRead(button4);

  // check if the button is pressed
  if (buttonState == HIGH && lastButtonState == LOW) {
    // if the button is pressed, start increasing the brightness
    for (int i = 0; i <= 255; i += fadeAmount) {
      analogWrite(led3, i);
      delay(100);
    }
    // then decrease the brightness back to 0
    for (int i = 255; i >= 0; i -= fadeAmount) {
      analogWrite(led3, i);
      delay(100);
    }
    brightness = 0;
  }
  lastButtonState = buttonState;

  // Check if increase button is pressed and adjust blink speed
  if (digitalRead(speedUpButton) == LOW) {
    blinkSpeed = min(blinkSpeed + 50, MAX_BLINK_SPEED);
    delay(100); // debounce
  }
  
  // Check if decrease button is pressed and adjust blink speed
  if (digitalRead(speedDownButton) == LOW) {
    blinkSpeed = max(blinkSpeed - 50, MIN_BLINK_SPEED);
    delay(100); // debounce
  }
  
  // Blink the LED
  digitalWrite(led2, HIGH);
  delay(blinkSpeed / 2);
  digitalWrite(led2, LOW);
  delay(blinkSpeed / 2);
}