#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <RTClib.h>
LiquidCrystal_I2C lcd(0x27, 20, 4);

RTC_DS1307 rtc;

const int selectButton = 2;
const int upButton = 3;
const int downButton = 4;
const int okButton = 7;
const int saveButton = 8;
const int ledHijau = 9;
int day = 0;
int month = 0;
int year = 0;
DateTime selectedDate;
int days_to_hatch;
bool is_hatching = false;
const int daysInMonth[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
const char* dayNames[] = {"Minggu", "Senin", "Selasa", "Rabu", "Kamis", "Jumat", "Sabtu"};
int menuOption = 0;
int menuMax = 2;
void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  selectedDate = selectedDate;
  pinMode(upButton, INPUT_PULLUP);
  pinMode(downButton, INPUT_PULLUP);
  pinMode(selectButton, INPUT_PULLUP);
  pinMode(saveButton, INPUT_PULLUP);
  pinMode(okButton, INPUT_PULLUP);
  rtc.begin();
  if (!rtc.isrunning()) {
    Serial.println("RTC is NOT running!");
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }
}

void loop() {
  DateTime now = rtc.now();
  int current_day = now.day();
  int current_month = now.month();
  int current_year = now.year();
  int current_day_of_week = now.dayOfTheWeek();
  lcd.setCursor(10, 0);
  lcd.print(String(current_day) + "/" + String(current_month) + "/" + String(current_year));
  lcd.setCursor(10, 1);
  lcd.print(String(now.hour()) + ":" + String(now.minute()) + ":" + String(now.second()));
  if (days_to_hatch < 0) {
    days_to_hatch = 0;
  }
  updateHatchingStatus();
  if (digitalRead(selectButton) == LOW) {
    delay(250);
    menuOption++;
    if (menuOption > menuMax) {
      menuOption = 0;
    }
    switch (menuOption) {
      case 1:
        day = current_day;
        month = current_month;
        year = current_year;
        dateSelectionMode();
        break;
      case 2:
        //menu kedua
        break;
    }
     delay(250);
  }
}

void dateSelectionMode() {
  DateTime selectedDate(year, month, day, 0, 0, 0);
  DateTime now = rtc.now();
  TimeSpan difference = selectedDate - now;
  days_to_hatch = difference.days() + 1;
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Pilih tggl menetas:");
  lcd.setCursor(0, 1);
  lcd.print(String(day) + "/" + String(month) + "/" + String(year));
  lcd.setCursor(10, 1);
  lcd.print("-->up/down");
  lcd.setCursor(0, 2);
  lcd.print("total 21 hari kdepan");
  lcd.setCursor(0, 3);
  lcd.print("tekan tombol --> OK");

  while (menuOption == 1) {
    if (digitalRead(upButton) == LOW) {
      delay(200);
      day++;
       if (day > daysInMonth[month - 1]) {
        day = 1;
        month++;
      }
      selectedDate = DateTime(year, month, day, selectedDate.hour(), selectedDate.minute(), selectedDate.second());
      lcd.setCursor(0, 1);
      lcd.print("  ");
      lcd.setCursor(0, 1);
      lcd.print(String(day) + "/" + String(month) + "/" + String(year));
      difference = selectedDate - now;
      days_to_hatch = difference.days() + 1;
      lcd.setCursor(0, 2);
      lcd.print(" ");
      lcd.setCursor(0, 2);
      lcd.print("total " + String(days_to_hatch) + " hari kdepan");
    }
    if (digitalRead(downButton) == LOW) {
      delay(200);
      day--;
      if (day < 1) {
        month--;
        if (month < 1) {
          month = 12;
          year--;
        }
        day = daysInMonth[month - 1];
      }
      selectedDate = DateTime(year, month, day, selectedDate.hour(), selectedDate.minute(), selectedDate.second());
      lcd.setCursor(0, 1);
      lcd.print("  "); 
      lcd.setCursor(0, 1);
      lcd.print(String(day) + "/" + String(month) + "/" + String(year));
    }
    if (digitalRead(okButton) == LOW) {
      delay(200);
      lcd.clear();
      //confirmationMode();
      setDaysToHatch();
     }
  }
}
/*void confirmationMode() {
  lcd.setCursor(0, 0);
  lcd.print("Tanggal sudah benar?");
  lcd.setCursor(0, 1);
  lcd.print(String(day) + "/" + String(month) + "/" + String(year));
  lcd.setCursor(0, 2);
  lcd.print("Tekan OK lagi Untuk");
  lcd.setCursor(0, 3);
  lcd.print("cek jumlah hari");

  while (menuOption == 1) {
    if (digitalRead(okButton) == LOW) {
      delay(200);
      lcd.clear();
      //menu = 3;
      setDaysToHatch();
    }
  }
}*/

void setDaysToHatch() {
  DateTime selectedDate(year, month, day, 0, 0, 0);
  DateTime now = rtc.now();
  TimeSpan difference = selectedDate - now;
  days_to_hatch = difference.days() + 1;
  DateTime startDate = selectedDate - TimeSpan(days_to_hatch, 0, 0, 0);
  lcd.setCursor(0, 0);
  lcd.print("Tgl tetas: ");
  lcd.setCursor(11, 0);
  lcd.print(String(day) + "/" + String(month) + "/" + String(year));
  lcd.setCursor(0, 1);
  lcd.print("Jmlh hari menetas:");
  lcd.print(days_to_hatch);
  lcd.setCursor(0, 2);
  lcd.print("Tgl mulai: " + String(startDate.day()) + "/" + String(startDate.month()) + "/" + String(startDate.year()));
  lcd.setCursor(0, 3);
  lcd.print("Tekan tombol SAVE...");
  while (menuOption == 1) {
    if (digitalRead(saveButton) == LOW) {
      delay(200);
      is_hatching = true;
      lcd.clear();
      lcd.setCursor(0, 1);
      lcd.print("Pengaturan diset");
      delay(1500);
      lcd.clear();
      menuOption = 0;
    }
  }
}

void calculateDaysToHatch(DateTime selectedDate) {
  DateTime now = rtc.now();
  TimeSpan difference = selectedDate - now;
  int days_passed = 21 - difference.days();
  //Serial.println(days_to_hatch);
  //Serial.println(days_passed);
  //koding untuk di wokwi
  if (days_passed < 0) {
    days_passed = 0;
  }
  else if (days_passed > 21) {
    days_passed = 0;
  } else {
    days_to_hatch = 21 - days_passed;
  }
  // Koding di IDE
  /*if (days_passed < 0) {
    days_passed = 0;
  }
  else {
    days_to_hatch = 21 - days_passed;
  }*/

  //DateTime hatch_date = selectedDate - TimeSpan(hatching_day, 0, 0, 0);
  DateTime hatch_date = selectedDate;
  lcd.setCursor(0, 2);
  lcd.print("H: ");
  //lcd.print("Jumlah hari:");
  lcd.print(days_passed);
  Serial.println(days_passed);
  lcd.setCursor(5, 2);
  lcd.print("TARg: " + String(hatch_date.day()) + "/" + String(hatch_date.month()) + "/" + (hatch_date.year()));
  lcd.setCursor(0, 3);
  lcd.print("Menetas dalam: ");
  lcd.print(days_to_hatch);
  lcd.print(" hr");
}

void updateHatchingStatus() {


  if (is_hatching) {
    if (selectedDate.year() != 0) {
      //calculateDaysToHatch(DateTime(year, month, day, 0, 0, 0)); --> jika tidak menggunakan data dari eeprom
      calculateDaysToHatch(selectedDate);
      if (days_to_hatch > 0) {
        //hitungMundur();
        digitalWrite(ledHijau, HIGH);
      } else if (days_to_hatch == 0) {
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Egg has hatched!");
        lcd.setCursor(0, 1);
        lcd.print("Remove the chick.");
        lcd.setCursor(0, 2);
        lcd.print("Tekan SELECT untuk");
        lcd.setCursor(0, 3);
        lcd.print("mengatur waktu tetas");
        is_hatching = false;

        if (digitalRead(selectButton) == LOW) {
          delay(200);
          lcd.clear();
          menuOption = 0;
        }
      } else {
        /*lcd.setCursor(0, 2);
          lcd.print("Belum ada proses");
          lcd.setCursor(0, 3);
          lcd.print("penetasan telur");*/
      }
    } else {
      lcd.setCursor(0, 2);
      lcd.print("Waktu penetasan blum");
      lcd.setCursor(0, 3);
      lcd.print("di atur,tekan SELECT");
    }
  }
}