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

RTC_DS1307 rtc;
LiquidCrystal_I2C lcd(0x27, 20, 4); // LCD 20x4 I2C

const int buzzerPin = 8;

const int alarmHour = 6;
const int alarmMinute = 55;

bool alarmTriggered = false;
unsigned long alarmStartTime = 0;

// Untuk deteksi perubahan
int lastSecond = -1;
int lastMinute = -1;
int lastDay = -1;
int lastGreetingHour = -1;  // agar ucapan tidak ditulis ulang terus

void setup() {
  Wire.begin();
    rtc.begin();
      lcd.begin(20, 4);
        lcd.backlight();
          pinMode(buzzerPin, OUTPUT);

            if (!rtc.isrunning()) {
                rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
                  }
                  }

                  void loop() {
                    DateTime now = rtc.now();

                      // Tanggal (baris 0)
                        if (now.day() != lastDay) {
                            lastDay = now.day();
                                lcd.setCursor(0, 0);
                                    lcd.print("                    "); // clear baris
                                        lcd.setCursor(0, 0);
                                            lcd.print(getDayName(now.dayOfTheWeek()));
                                                lcd.print(" ");
                                                    lcd.print(now.day());
                                                        lcd.print("/");
                                                            lcd.print(now.month());
                                                                lcd.print("/");
                                                                    lcd.print(now.year());
                                                                      }

                                                                        // Jam (baris 1)
                                                                          if (now.second() != lastSecond) {
                                                                              lastSecond = now.second();

                                                                                  int hour = now.hour();
                                                                                      bool isPM = false;
                                                                                          if (hour >= 12) {
                                                                                                isPM = true;
                                                                                                      if (hour > 12) hour -= 12;
                                                                                                          } else if (hour == 0) {
                                                                                                                hour = 12;
                                                                                                                    }

                                                                                                                        lcd.setCursor(0, 1);
                                                                                                                            if (hour < 10) lcd.print("0");
                                                                                                                                lcd.print(hour);
                                                                                                                                    lcd.print(":");
                                                                                                                                        if (now.minute() < 10) lcd.print("0");
                                                                                                                                            lcd.print(now.minute());
                                                                                                                                                lcd.print(":");
                                                                                                                                                    if (now.second() < 10) lcd.print("0");
                                                                                                                                                        lcd.print(now.second());
                                                                                                                                                            lcd.print(isPM ? " PM " : " AM ");
                                                                                                                                                              }

                                                                                                                                                                // Alarm (baris 2)
                                                                                                                                                                  if (now.minute() != lastMinute) {
                                                                                                                                                                      lastMinute = now.minute();
                                                                                                                                                                          lcd.setCursor(0, 2);
                                                                                                                                                                              lcd.print("Alarm: ");
                                                                                                                                                                                  if (alarmHour < 10) lcd.print("0");
                                                                                                                                                                                      lcd.print(alarmHour);
                                                                                                                                                                                          lcd.print(":");
                                                                                                                                                                                              if (alarmMinute < 10) lcd.print("0");
                                                                                                                                                                                                  lcd.print(alarmMinute);
                                                                                                                                                                                                      lcd.print("         ");
                                                                                                                                                                                                        }

                                                                                                                                                                                                          // Ucapan waktu (baris 3)
                                                                                                                                                                                                            if (now.hour() != lastGreetingHour) {
                                                                                                                                                                                                                lastGreetingHour = now.hour();
                                                                                                                                                                                                                    lcd.setCursor(0, 3);
                                                                                                                                                                                                                        lcd.print("                    "); // clear baris
                                                                                                                                                                                                                            lcd.setCursor(0, 3);
                                                                                                                                                                                                                                lcd.print(getGreeting(now.hour()));
                                                                                                                                                                                                                                  }

                                                                                                                                                                                                                                    // Alarm bunyi 5 detik
                                                                                                                                                                                                                                      if (now.hour() == alarmHour && now.minute() == alarmMinute && !alarmTriggered) {
                                                                                                                                                                                                                                          tone(buzzerPin, 1000);
                                                                                                                                                                                                                                              alarmStartTime = millis();
                                                                                                                                                                                                                                                  alarmTriggered = true;
                                                                                                                                                                                                                                                    }

                                                                                                                                                                                                                                                      if (alarmTriggered && millis() - alarmStartTime >= 5000) {
                                                                                                                                                                                                                                                          noTone(buzzerPin);
                                                                                                                                                                                                                                                              alarmTriggered = false;
                                                                                                                                                                                                                                                                }

                                                                                                                                                                                                                                                                  delay(100);
                                                                                                                                                                                                                                                                  }

                                                                                                                                                                                                                                                                  // Nama hari
                                                                                                                                                                                                                                                                  String getDayName(int day) {
                                                                                                                                                                                                                                                                    switch (day) {
                                                                                                                                                                                                                                                                        case 0: return "Minggu";
                                                                                                                                                                                                                                                                            case 1: return "Senin";
                                                                                                                                                                                                                                                                                case 2: return "Selasa";
                                                                                                                                                                                                                                                                                    case 3: return "Rabu";
                                                                                                                                                                                                                                                                                        case 4: return "Kamis";
                                                                                                                                                                                                                                                                                            case 5: return "Jumat";
                                                                                                                                                                                                                                                                                                case 6: return "Sabtu";
                                                                                                                                                                                                                                                                                                    default: return "";
                                                                                                                                                                                                                                                                                                      }
                                                                                                                                                                                                                                                                                                      }

                                                                                                                                                                                                                                                                                                      // Ucapan sesuai jam
                                                                                                                                                                                                                                                                                                      String getGreeting(int hour) {
                                                                                                                                                                                                                                                                                                        if (hour >= 4 && hour <= 10) {
                                                                                                                                                                                                                                                                                                            return "Selamat Pagi  ";
                                                                                                                                                                                                                                                                                                              } else if (hour >= 11 && hour <= 14) {
                                                                                                                                                                                                                                                                                                                  return "Selamat Siang ";
                                                                                                                                                                                                                                                                                                                    } else if (hour >= 15 && hour <= 17) {
                                                                                                                                                                                                                                                                                                                        return "Selamat Sore ";
                                                                                                                                                                                                                                                                                                                          } else {
                                                                                                                                                                                                                                                                                                                              return "Selamat Malam ";
                                                                                                                                                                                                                                                                                                                                }
                                                                                                                                                                                                                                                                                                                                }