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

#define DHTPIN 12
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);

LiquidCrystal_I2C lcd(0x27, 20, 4);

#define PHOTO_PIN A0
int photo_value = 0;

RTC_DS1307 RTC;

int P1 = 11;
int P2 = 10;
int P3 = 9;
int BUZZER_PIN = 8;
int oraagg;
int minagg;
int annoagg;
int meseagg;
int dayagg;
int currentState = 0;


int alarmHour = 7;  
int alarmMinute = 0;
bool alarmEnabled = false;

// Оголошення функцій
void temp_and_hum();
void DisplayDateTime();
void DisplaySetHour();
void DisplaySetMinute();
void DisplaySetYear();
void DisplaySetMonth();
void DisplaySetDay();
void StoreAgg();
void checkHourlyChime();
void checkAlarm();

void setup() {
  dht.begin();
  lcd.init();
  pinMode(PHOTO_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  RTC.begin();

  // Встановлення RTC
  if (!RTC.isrunning()) {
    lcd.setCursor(0, 2);
    lcd.print("RTC is NOT running!");
    RTC.adjust(DateTime(__DATE__, __TIME__));
  }

  int currentState = 0;
}

void loop() {
  photo_value = analogRead(PHOTO_PIN);
  if (photo_value < 400)
    lcd.setBacklight(0);
  else
    lcd.setBacklight(1);

  temp_and_hum();
  checkHourlyChime();
  checkAlarm();
  delay(2000);
}

void temp_and_hum() {
  float h = dht.readHumidity();
  float t = dht.readTemperature();

  if (isnan(t) || isnan(h)) {
    lcd.setCursor(0, 1);
    lcd.print("Error reading from DHT");
  } else {
    lcd.setCursor(0, 2);
    lcd.print("Hum  = ");
    lcd.print(h);
    lcd.println(" %");
    lcd.setCursor(0, 1);
    lcd.print("Temp = ");
    lcd.print(t);
    lcd.println(" *C");
  }

  if (digitalRead(P1)) {
    currentState = currentState + 1;
  }
  if (currentState == 0) {
    DisplayDateTime();
  }
  if (currentState == 1) {
    DisplaySetHour();
  }
  if (currentState == 2) {
    DisplaySetMinute();
  }
  if (currentState == 3) {
    DisplaySetYear();
  }
  if (currentState == 4) {
    DisplaySetMonth();
  }
  if (currentState == 5) {
    DisplaySetDay();
  }
  if (currentState == 6) {
    StoreAgg();
    delay(500);
    currentState = 0;
  }
  delay(100);
}

void checkHourlyChime() {
  DateTime now = RTC.now();
  static int lastHour = -1;

  if (now.hour() != lastHour) {
    lastHour = now.hour();
    for (int i = 0; i < now.hour(); i++) {
      tone(BUZZER_PIN, 2000, 500);
      delay(600);
    }
  }
}

void checkAlarm() {
  DateTime now = RTC.now();

  if (alarmEnabled && now.hour() == alarmHour && now.minute() == alarmMinute) {
    for (int i = 0; i < 10; i++) {
      tone(BUZZER_PIN, 2000, 500); 
      delay(600);
    }
    alarmEnabled = false; 
  }
}

void DisplayDateTime() {
  DateTime now = RTC.now();

  lcd.setCursor(0, 0);

  if (now.hour() <= 9) {
    lcd.print("0");
  }
  lcd.print(now.hour(), DEC);
  oraagg = now.hour();
  lcd.print(":");
  if (now.minute() <= 9) {
    lcd.print("0");
  }
  lcd.print(now.minute(), DEC);
  minagg = now.minute();
  lcd.print(":");
  if (now.second() <= 9) {
    lcd.print("0");
  }
  lcd.print(now.second(), DEC);

  lcd.setCursor(10, 0);

  if (now.day() <= 9) {
    lcd.print("0");
  }
  lcd.print(now.day(), DEC);
  dayagg = now.day();
  lcd.print("/");

  if (now.month() <= 9) {
    lcd.print("0");
  }
  lcd.print(now.month(), DEC);
  meseagg = now.month();
  lcd.print("/");
  lcd.print(now.year(), DEC);
  annoagg = now.year();
}

void DisplaySetHour() {
  lcd.clear();
  DateTime now = RTC.now();
  int ora = now.hour();
  if (digitalRead(P2) == HIGH) {
    if (oraagg == 23) {
      oraagg = 0;
    } else {
      oraagg = oraagg + 1;
    }
    delay(200); 
  }
  if (digitalRead(P3) == HIGH) {
    if (oraagg == 0) {
      oraagg = 23;
    } else {
      oraagg = oraagg - 1;
    }
    delay(200);  
  }
  lcd.setCursor(0, 0);
  lcd.print("Set time:");
  lcd.setCursor(0, 1);
  lcd.print(oraagg, DEC);
  delay(200);
}

void DisplaySetMinute() {
  lcd.clear();
  if (digitalRead(P2) == HIGH) {
    if (minagg == 59) {
      minagg = 0;
    } else {
      minagg = minagg + 1;
    }
    delay(200); 
  }
  if (digitalRead(P3) == HIGH) {
    if (minagg == 0) {
      minagg = 59;
    } else {
      minagg = minagg - 1;
    }
    delay(200); 
  }
  lcd.setCursor(0, 0);
  lcd.print("Set Minutes:");
  lcd.setCursor(0, 1);
  lcd.print(minagg, DEC);
  delay(200);
}

void DisplaySetYear() {
  lcd.clear();
  if (digitalRead(P2) == HIGH) {
    annoagg = annoagg + 1;
    delay(200);  
  }
  if (digitalRead(P3) == HIGH) {
    annoagg = annoagg - 1;
    delay(200); 
  }
  lcd.setCursor(0, 0);
  lcd.print("Set Year:");
  lcd.setCursor(0, 1);
  lcd.print(annoagg, DEC);
  delay(200);
}

void DisplaySetMonth() {
  lcd.clear();
  if (digitalRead(P2) == HIGH) {
    if (meseagg == 12) {
      meseagg = 1;
    } else {
      meseagg = meseagg + 1;
    }
    delay(200); 
  }
  if (digitalRead(P3) == HIGH) {
    if (meseagg == 12) {
      meseagg = 12;
    } else {
      meseagg = meseagg - 1;
    }
    delay(200);  
  }
  lcd.setCursor(0, 0);
  lcd.print("Set Month:");
  lcd.setCursor(0, 1);
  lcd.print(meseagg, DEC);
  delay(200);
}

void DisplaySetDay() {
  lcd.clear();
  if (digitalRead(P2) == HIGH) {
    if (dayagg == 31) {
      dayagg = 1;
    } else {
      dayagg = dayagg + 1;
    }
    delay(200);  
  }
  if (digitalRead(P3) == HIGH) {
    if (dayagg == 1) {
      dayagg = 31;
    } else {
      dayagg = dayagg - 1;
    }
    delay(200); 
  }
  lcd.setCursor(0, 0);
  lcd.print("Set Day:");
  lcd.setCursor(0, 1);
  lcd.print(dayagg, DEC);
  delay(200);
}

void StoreAgg() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("SAVING");
  lcd.setCursor(0, 1);
  lcd.print("IN PROGRESS");
  RTC.adjust(DateTime(annoagg, meseagg, dayagg, oraagg, minagg, 0));
  delay(200);
}