const int LED_PINS[] = {2, 3, 4, 5, 6};
const int LED_COUNT = sizeof(LED_PINS) / sizeof(LED_PINS[0]);

const int JOY_X = A0;
const int JOY_BUTTON = 7;

const int LOW_THRESHOLD = 300;   // наклон в сторону 0
const int HIGH_THRESHOLD = 700;  // наклон в сторону 1023
const unsigned long BLINK_INTERVAL = 300;
const unsigned long DEBOUNCE_DELAY = 50;

int current = 0;            // какой светодиод выбран
bool blinking = false;      // мигает или горит ровно
bool stickCentered = true;  // джойстик вернулся в центр

bool ledOn = true;
unsigned long lastBlink = 0;

int lastButtonReading = HIGH;
int buttonState = HIGH;
unsigned long lastDebounce = 0;

void setup() {
  for (int i = 0; i < LED_COUNT; i++) {
    pinMode(LED_PINS[i], OUTPUT);
  }
  pinMode(JOY_BUTTON, INPUT_PULLUP);
}

void loop() {
  readStick();
  readButton();
  updateLeds();
}

void readStick() {
  int x = analogRead(JOY_X);

  if (x > LOW_THRESHOLD && x < HIGH_THRESHOLD) {
    stickCentered = true;
    return;
  }
  if (!stickCentered) return;
  stickCentered = false;

  if (x <= LOW_THRESHOLD && current < LED_COUNT - 1) current++;
  if (x >= HIGH_THRESHOLD && current > 0) current--;

  ledOn = true;
  lastBlink = millis();
}

void readButton() {
  int reading = digitalRead(JOY_BUTTON);

  if (reading != lastButtonReading) {
    lastDebounce = millis();
  }
  lastButtonReading = reading;

  if (millis() - lastDebounce < DEBOUNCE_DELAY) return;
  if (reading == buttonState) return;

  buttonState = reading;
  if (buttonState == LOW) {
    blinking = !blinking;
    ledOn = true;
    lastBlink = millis();
  }
}

void updateLeds() {
  if (blinking && millis() - lastBlink >= BLINK_INTERVAL) {
    ledOn = !ledOn;
    lastBlink = millis();
  }

  for (int i = 0; i < LED_COUNT; i++) {
    bool on = (i == current) && (!blinking || ledOn);
    digitalWrite(LED_PINS[i], on ? HIGH : LOW);
  }
}