#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 20, 4);

const int soundSensor1Pin = A1;
const int soundSensor2Pin = A2;
const int lightSensorPin = A0;
const int buzzerPin = 8;

const int soundThreshold = 600;
const int lightThreshold = 500;

unsigned long previousMillis = 0;
const long interval = 200; // Update interval ms

void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();

  // Print static labels once
  lcd.setCursor(0, 0);
  lcd.print("Firework Detector");

  lcd.setCursor(0, 1);
  lcd.print("Sound1: ");

  lcd.setCursor(0, 2);
  lcd.print("Sound2: ");

  lcd.setCursor(0, 3);
  lcd.print("Light : ");

  pinMode(buzzerPin, OUTPUT);
  digitalWrite(buzzerPin, LOW);
}

void printValueAt(int col, int row, int value, int width=6) {
  // Print integer value right after label with fixed width for smooth update
  char buf[7];
  snprintf(buf, sizeof(buf), "%*d", width, value); // right-aligned, width padded
  lcd.setCursor(col, row);
  lcd.print(buf);
}

void updateFireworkStatus(bool detected) {
  lcd.setCursor(15, 3); // fixed position
  if (detected) {
    lcd.print("FIREWORK");
  } else {
    lcd.print("        "); // clear old text smoothly
  }
}

void loop() {
  unsigned long currentMillis = millis();

  int sound1 = analogRead(soundSensor1Pin);
  int sound2 = analogRead(soundSensor2Pin);
  int lightLevel = analogRead(lightSensorPin);

  bool fireworkDetected = (sound1 > soundThreshold || sound2 > soundThreshold) && lightLevel > lightThreshold;

  // Buzzer control real-time
  digitalWrite(buzzerPin, fireworkDetected ? HIGH : LOW);

  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;

    // Update sensor values smoothly
    printValueAt(8, 1, sound1);
    printValueAt(8, 2, sound2);
    printValueAt(8, 3, lightLevel);

    updateFireworkStatus(fireworkDetected);
  }

  // Serial command to print sensor values on demand
  if (Serial.available() > 0) {
    String cmd = Serial.readStringUntil('\n');
    cmd.trim();
    if (cmd.equalsIgnoreCase("update")) {
      Serial.print("Sound1: "); Serial.print(sound1);
      Serial.print("  Sound2: "); Serial.print(sound2);
      Serial.print("  Light: "); Serial.println(lightLevel);
      if (fireworkDetected) Serial.println(">> Firework Detected!");
    }
  }
}