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#include <Adafruit_NeoPixel.h>
#define PIN 13
#define NUMPIXELS 8
#define BUTTON_PIN 12
Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

const int sensorPin = A0;
const float gain = 0.548;
const float minInputVoltage = 6;
const float maxInputVoltage = 8.4;
const float stepVoltage = (float)(maxInputVoltage - minInputVoltage) / NUMPIXELS;

float previousButtonState;
unsigned long previousMillis = 0;
unsigned long debounceInterval = 30;

unsigned long ledOnMillis = 0;
const unsigned long ledDuration = 3000;

bool ledsOn = false;
bool buttonPressed = false;

void setup() {
  pixels.begin();
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  previousButtonState = digitalRead(BUTTON_PIN);
}

void loop() {
  unsigned long currentMillis = millis();
  //debouncing
  if (currentMillis - previousMillis >= debounceInterval) {
    float currentButtonState = digitalRead(BUTTON_PIN);
    if (currentButtonState != previousButtonState) {
      previousMillis = currentMillis;
      previousButtonState = currentButtonState;

      if (currentButtonState == LOW) {
        ledsOn = true;
        buttonPressed = true;
        ledOnMillis = currentMillis;
      }
    }
  }

  if (ledsOn) {
    if (currentMillis - ledOnMillis <= ledDuration) {
      float sensorValue = analogRead(sensorPin);
      float outputVoltage = (5 / 1023.0) * sensorValue;
      float inputVoltage = (float)outputVoltage / gain;

      int ledOn = 0;
      if (inputVoltage >= minInputVoltage) {
        ledOn = (float)((inputVoltage - minInputVoltage) / stepVoltage);
        if (ledOn > NUMPIXELS) {
          ledOn = NUMPIXELS;
        }
      }

      for (int i = 0; i < NUMPIXELS; i++) {
        if (i < ledOn) {
          if (i == 0) {
            pixels.setPixelColor(i, pixels.Color(35, 0, 0));
          } else if (i == 1) {
            pixels.setPixelColor(i, pixels.Color(30, 5, 0));
          } else if (i == 2) {
            pixels.setPixelColor(i, pixels.Color(25, 10, 0));
          } else if (i == 3) {
            pixels.setPixelColor(i, pixels.Color(20, 15, 0));
          } else if (i == 4) {
            pixels.setPixelColor(i, pixels.Color(15, 20, 0));
          } else if (i == 5) {
            pixels.setPixelColor(i, pixels.Color(10, 25, 0));
          } else if (i == 6) {
            pixels.setPixelColor(i, pixels.Color(5, 30, 0));
          } else if (i == 7) {
            pixels.setPixelColor(i, pixels.Color(0, 35, 0));
          }
        } else {
          pixels.setPixelColor(i, pixels.Color(0, 0, 0));
        }
      }
      pixels.show();
    } else {
      ledsOn = false;
      buttonPressed = false;
      for (int i = 0; i < NUMPIXELS; i++) {
        pixels.setPixelColor(i, pixels.Color(0, 0, 0));
      }
      pixels.show();
    }
  }
}