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

LiquidCrystal_I2C lcd(0x27, 16, 2);
RTC_DS3231 rtc;

// PINLAR
#define BTN_MODE  2
#define BTN_UP    3
#define BTN_DOWN  4
#define BUZZER    6
#define RELAY     8  // IN A ulangan 1-kanalli rele

// ALARM VAQTI
int alarmHour = 7;
int alarmMin  = 0;

bool alarmActive = false;
byte setMode = 0; // 0-normal, 1-hour, 2-minute

void setup() {
  pinMode(BTN_MODE, INPUT_PULLUP);
  pinMode(BTN_UP, INPUT_PULLUP);
  pinMode(BTN_DOWN, INPUT_PULLUP);
  pinMode(BUZZER, OUTPUT);
  pinMode(RELAY, OUTPUT);

  digitalWrite(BUZZER, LOW);
  digitalWrite(RELAY, HIGH); // ACTIVE LOW rele, HIGH = o‘chik

  lcd.init();
  lcd.backlight();

  rtc.begin();

  // ===== RTC VAQTINI FAQAT 1 MARTA SOZLASH =====
  if (rtc.lostPower()) {
    rtc.adjust(DateTime(2026, 1, 10, 11, 30, 0));
  }
}

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

  // ===== LCD =====
  lcd.setCursor(0, 0);
  lcd.print("Time ");
  print2(now.hour());
  lcd.print(":");
  print2(now.minute());

  lcd.setCursor(0, 1);
  lcd.print("Alarm ");
  print2(alarmHour);
  lcd.print(":");
  print2(alarmMin);

  // ===== MODE BOSILSA =====
  if (digitalRead(BTN_MODE) == LOW) {
    setMode++;
    if (setMode > 2) setMode = 0;
    delay(300);
  }

  // ===== ALARM VAQTINI SOZLASH =====
  if (setMode == 1) { // soat
    if (digitalRead(BTN_UP) == LOW) {
      alarmHour = (alarmHour + 1) % 24;
      delay(300);
    }
    if (digitalRead(BTN_DOWN) == LOW) {
      alarmHour = (alarmHour + 23) % 24;
      delay(300);
    }
  }

  if (setMode == 2) { // minut
    if (digitalRead(BTN_UP) == LOW) {
      alarmMin = (alarmMin + 1) % 60;
      delay(300);
    }
    if (digitalRead(BTN_DOWN) == LOW) {
      alarmMin = (alarmMin + 59) % 60;
      delay(300);
    }
  }

  // ===== ALARM ISHGA TUSHISHI =====
  if (now.hour() == alarmHour &&
      now.minute() == alarmMin &&
      !alarmActive) {

    alarmActive = true;
    digitalWrite(BUZZER, HIGH);
    digitalWrite(RELAY, LOW);  // ACTIVE LOW = yoqish
  }

  // ===== KNOPKA BOSILSA O‘CHADI =====
  if (alarmActive &&
     (digitalRead(BTN_MODE) == LOW 
      digitalRead(BTN_UP)   == LOW 
      digitalRead(BTN_DOWN) == LOW)) {

    digitalWrite(BUZZER, LOW);
    digitalWrite(RELAY, HIGH); // ACTIVE LOW = o‘chirish
    alarmActive = false;
    delay(500);
  }

  delay(200);
}

// ===== YORDAMCHI FUNKSIYA =====
void print2(int n) {
  if (n < 10) lcd.print("0");
  lcd.print(n);
}