#include <avr/wdt.h> //watchdog library, library bawaan
#include <avr/sleep.h>
#include <Wire.h>
#include <stdio.h>
#include <RTClib.h> // Library untuk RTC DS3231
#include "PrayerTimes.h" // Library waktu sholat
#include "formula.h"

RTC_DS1307 rtc; // Membuat objek RTC
double times[sizeof(TimeName) / sizeof(char*)];
int GMT = 7; // Zona waktu WIB=7, WITA=8, WIT=9, inisialisasi GMT
ISR(WDT_vect)
{
  wdt_disable();  // disable watchdog
}

void myWatchdogEnable(const byte interval)
{
  MCUSR = 0;                          // reset various flags
  WDTCSR |= 0b00011000;               // see docs, set WDCE, WDE
  WDTCSR =  0b01000000 | interval;    // set WDIE, and appropriate delay

  wdt_reset();
  set_sleep_mode (SLEEP_MODE_PWR_DOWN);
  sleep_mode();            // now goes to Sleep and waits for the interrupt
}

unsigned long previousMillis = 0; // Waktu terakhir pembaruan dilakukan
const unsigned long interval = 1000; // Interval 1 menit (60.000 ms)

void setup() {
  Serial.begin(115200);
  Wire.begin(); // Inisialisasi I2C
  
  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    while (1) delay(10);
  }

  if (! rtc.isrunning()) {
    Serial.println("RTC is NOT running, let's set the time!");
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }
}

void loop() {
  unsigned long currentMillis = millis(); // Dapatkan waktu saat ini

  // Periksa apakah interval waktu 1 menit telah berlalu
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis; // Perbarui waktu sebelumnya
    displayTime();
  }
}

void displayTime() {
  float latitude = -7.817272;
  float longitude = 110.3399212;
  DateTime now = rtc.now(); // Ambil waktu sekarang dari RTC
  int bulan = now.month();
  uint16_t tgl = now.day();
  hijri H = toHijri(tgl, bulan, now.year()); // Konversi tanggal sekarang ke Hijriah

  Serial.print("Latitude: ");
  Serial.println(latitude);
  Serial.print("Longitude: ");
  Serial.println(longitude);
  Serial.print("GMT: ");
  Serial.println(GMT);
  Serial.print("Masehi: ");
  Serial.println(String(tgl) + "/" + String(bulan) + "/" + now.year());
  Serial.print("Hijriah: ");
  Serial.print(H.date);
  Serial.print("/");
  Serial.print(hijriMonth[H.month - 1]);
  Serial.print("/");
  Serial.println(H.year);

  set_calc_method(ISNA); // Metode kalkulasi
  set_asr_method(Shafii); // Metode Asr
  set_high_lats_adjust_method(AngleBased);
  set_fajr_angle(20);
  set_isha_angle(18);
  get_prayer_times(int(now.year()), int(now.month()), int(now.day()), latitude, longitude, GMT, times);

  for (int i = 0; i < sizeof(times)/sizeof(times[0]); i++) {
      Serial.print("Time ");
      Serial.print(i);
      Serial.print(": ");
      Serial.println(times[i], 6); // Cetak dengan 6 desimal untuk melihat nilai float
  }

  int hours, minutes;

  // Koreksi waktu sholat masing-masing
  int koreksiImsak = -5;
  int koreksiSubuh = 0;
  int koreksiDhuha = 0;
  int koreksiDzuhur = 0;
  int koreksiAshar = 0;
  int koreksiMaghrib = 0;
  int koreksiIsya = 0;

  // Imsak
  get_float_time_parts(times[0], hours, minutes);
  minutes += koreksiImsak;
  adjustTime(hours, minutes);
  Serial.print("Imsak: ");
  Serial.print(hours);
  Serial.print(":");
  Serial.println(minutes);

  // Subuh
  minutes -= koreksiImsak; // Kembalikan ke waktu asli
  minutes += koreksiSubuh;
  adjustTime(hours, minutes);
  Serial.print("Subuh: ");
  Serial.print(hours);
  Serial.print(":");
  Serial.println(minutes);

  // Dhuha
  get_float_time_parts(times[1], hours, minutes);
  minutes += koreksiDhuha;
  adjustTime(hours, minutes);
  Serial.print("Dhuha: ");
  Serial.print(hours);
  Serial.print(":");
  Serial.println(minutes);

  // Dzuhur
  get_float_time_parts(times[2], hours, minutes);
  minutes += koreksiDzuhur;
  adjustTime(hours, minutes);
  Serial.print("Dzuhur: ");
  Serial.print(hours);
  Serial.print(":");
  Serial.println(minutes);

  // Ashar
  get_float_time_parts(times[3], hours, minutes);
  minutes += koreksiAshar;
  adjustTime(hours, minutes);
  Serial.print("Ashar: ");
  Serial.print(hours);
  Serial.print(":");
  Serial.println(minutes);

  // Maghrib
  get_float_time_parts(times[5], hours, minutes);
  minutes += koreksiMaghrib;
  adjustTime(hours, minutes);
  Serial.print("Maghrib: ");
  Serial.print(hours);
  Serial.print(":");
  Serial.println(minutes);

  // Isya
  get_float_time_parts(times[6], hours, minutes);
  minutes += koreksiIsya;
  adjustTime(hours, minutes);
  Serial.print("Isya: ");
  Serial.print(hours);
  Serial.print(":");
  Serial.println(minutes);

  Serial.println("---------------------------");
}

// Fungsi untuk menyesuaikan jam dan menit jika ada koreksi waktu
void adjustTime(int &hours, int &minutes) {
  while (minutes >= 60) {
    hours += 1;
    minutes -= 60;
  }
  while (minutes < 0) {
    hours -= 1;
    minutes += 60;
  }

  // Pastikan jam berada dalam rentang 0-23
  if (hours >= 24) {
    hours -= 24;
  }
  if (hours < 0) {
    hours += 24;
  }
}