#include <Servo.h>  // Included as per package allowance

// Define pin assignments:
const int ledPin = 6;     // PWM output for led1
const int potPin = A0;    // Analog input from pot1

// Bar-graph segment pins mapped to digital pins for bargraph1 (segments A1-A10)
const int barPins[10] = {22, 23, 24, 25, 26, 27, 28, 29, 30, 31};

// Variables used for LED blinking at 0.25 Hz (2 sec on, 2 sec off)
unsigned long lastBlinkTime = 0;
bool blinkState = false;

void setup() {
  // Initialize led1 pin.
  pinMode(ledPin, OUTPUT);
  analogWrite(ledPin, 0);  // initially off

  // Initialize bar graph segment pins and turn them off.
  for (int i = 0; i < 10; i++) {
    pinMode(barPins[i], OUTPUT);
    digitalWrite(barPins[i], LOW);
  }
}

void loop() {
  // Read the potentiometer value (0-1023)
  int potValue = analogRead(potPin);
  
  // Determine how many segments to light:
  // 0-102 means 0 segments; 103-204 means 1 segment; ...; 921-1023 means 10 segments.
  int numSegments = 0;
  if (potValue <= 102) {
    numSegments = 0;
  } else {
    numSegments = ((potValue - 103) / 102) + 1;  // integer division produces the appropriate count
    if (numSegments > 10) {
      numSegments = 10;
    }
  }
  
  // Update the bar graph: turn on the first numSegments, turn off remaining segments.
  for (int i = 0; i < 10; i++) {
    if (i < numSegments) {
      digitalWrite(barPins[i], HIGH);
    } else {
      digitalWrite(barPins[i], LOW);
    }
  }
  
  // Control the LED behavior
  // If the potentiometer is at its maximum value then blink the LED.
  if (potValue == 1023) {
    unsigned long currentMillis = millis();
    // Check if it’s time to toggle the LED (every 2000 milliseconds)
    if (currentMillis - lastBlinkTime >= 2000) {
      lastBlinkTime = currentMillis;
      blinkState = !blinkState;
      digitalWrite(ledPin, blinkState ? HIGH : LOW);
    }
  } else {
    // If not at maximum pot value, then use analogWrite to set LED brightness proportionally
    // Reset blinking timer in case we were blinking previously.
    lastBlinkTime = millis();
    int brightness = map(potValue, 0, 1023, 0, 255);
    analogWrite(ledPin, brightness);
  }
}