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

LiquidCrystal_I2C lcd(0x27, 16, 2);
const int buzzerPin = 8;

void setup() {
  lcd.begin(16, 2);
  lcd.backlight();
  pinMode(buzzerPin, OUTPUT);
  lcd.setCursor(0, 0);
  lcd.print("School Bell System");
  delay(2000);
  lcd.clear();
}

void loop() {
  for (int i = 1; i <= 4; i++) {
    ringPeriod(i);
    delay(5000);
  }

  ringBreak("Short Break");
  delay(3000);

  for (int i = 5; i <= 6; i++) {
    ringPeriod(i);
    delay(5000);
  }

  ringBreak("Lunch Break");
  delay(3000);

  for (int i = 7; i <= 8; i++) {
    ringPeriod(i);
    delay(5000);
  }

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("School Over");
  lcd.setCursor(0, 1);
  lcd.print("Goodbye!");
  ringBell(4); // Longer bell
  delay(10000);
}

void ringPeriod(int num) {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Period ");
  lcd.print(num);
  lcd.setCursor(0, 1);
  lcd.print("Ringing...");
  ringBell(2);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Period ");
  lcd.print(num);
  lcd.setCursor(0, 1);
  lcd.print("Started");
}

void ringBreak(String name) {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print(name);
  lcd.setCursor(0, 1);
  lcd.print("Break Time!");
  ringBell(3);
}

void ringBell(int times) {
  for (int i = 0; i < times; i++) {
    tone(buzzerPin, 1000);  // 1000 Hz sound
    delay(500);
    noTone(buzzerPin);
    delay(500);
  }
}