#include <Servo.h>  // Included per allowed packages

// Define Arduino pins used for the LEDs and the bar graph segments.
const int ledPins[3] = {22, 23, 24};
const int barPins[10] = {30, 31, 32, 33, 34, 35, 36, 37, 38, 39};

// A helper function to update the bar graph display.
// It will turn on the first 'count' segments and turn off the others.
void updateBarGraph(int count) {
  for (int i = 0; i < 10; i++) {
    if (i < count) {
      digitalWrite(barPins[i], HIGH);
    } else {
      digitalWrite(barPins[i], LOW);
    }
  }
}

void setup() {
  // Initialize LED output pins
  for (int i = 0; i < 3; i++) {
    pinMode(ledPins[i], OUTPUT);
    digitalWrite(ledPins[i], LOW);
  }
  
  // Initialize bar graph output pins
  for (int i = 0; i < 10; i++) {
    pinMode(barPins[i], OUTPUT);
    digitalWrite(barPins[i], LOW);
  }
}

void loop() {
  // Phase 1: Only led1 is ON; bar graph shows 1 segment.
  digitalWrite(ledPins[0], HIGH);
  digitalWrite(ledPins[1], LOW);
  digitalWrite(ledPins[2], LOW);
  updateBarGraph(1);
  delay(2000);
  
  // Phase 2: led1 and led2 are ON; bar graph shows 2 segments.
  digitalWrite(ledPins[0], HIGH);
  digitalWrite(ledPins[1], HIGH);
  digitalWrite(ledPins[2], LOW);
  updateBarGraph(2);
  delay(2000);
  
  // Phase 3: All three LEDs are ON; bar graph shows 3 segments.
  digitalWrite(ledPins[0], HIGH);
  digitalWrite(ledPins[1], HIGH);
  digitalWrite(ledPins[2], HIGH);
  updateBarGraph(3);
  delay(2000);
  
  // Final Phase: Turn off all LEDs; bar graph lights all 10 segments.
  digitalWrite(ledPins[0], LOW);
  digitalWrite(ledPins[1], LOW);
  digitalWrite(ledPins[2], LOW);
  updateBarGraph(10);
  delay(2000);
  
  // After the final phase, reset everything OFF for the next cycle.
  for (int i = 0; i < 3; i++) {
    digitalWrite(ledPins[i], LOW);
  }
  updateBarGraph(0);
  delay(500);  // brief pause before repeating the cycle
}