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

/*
 * Smart Medicine Reminder
 * This Arduino sketch controls an LCD display, RTC, push buttons, and a buzzer
 * to remind users to take their medicine at scheduled times. The user can set
 * the time, number of dosages, and the next medicine time using the push buttons.
 */

// LCD pins
const int rs = 12, en = 11, d4 = 6, d5 = 5, d6 = 4, d7 = 3;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

// RTC
RTC_DS3231 rtc;

// Buzzer pin
const int buzzerPin = 13;

// Push buttons
const int button1Pin = A0;
const int button2Pin = 7;
const int button3Pin = 8;
const int button4Pin = 9;

// Variables to store settings
int setHour = 0;
int setMinute = 0;
int setDosages = 0;
DateTime nextMedicineTime;

void setup() {
  // Initialize LCD
  lcd.begin(16, 2);
  lcd.print("Medicine Reminder");
  delay(1000);
  lcd.clear();

  // Initialize RTC
  if (!rtc.begin()) {
    lcd.print("Couldn't find RTC");
    while (1);
  }
  if (rtc.lostPower()) {
    lcd.print("RTC lost power");
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }

  // Initialize buzzer
  pinMode(buzzerPin, OUTPUT);

  // Initialize push buttons
  pinMode(button1Pin, INPUT_PULLUP);
  pinMode(button2Pin, INPUT_PULLUP);
  pinMode(button3Pin, INPUT_PULLUP);
  pinMode(button4Pin, INPUT_PULLUP);
}

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

  // Display current time
  lcd.setCursor(0, 0);
  lcd.print(now.hour(), DEC);
  lcd.print(':');
  lcd.print(now.minute(), DEC);
  lcd.print(':');
  lcd.print(now.second(), DEC);

  // Check push buttons for setting time and dosage
  if (digitalRead(button1Pin) == LOW) {
    delay(50); // Debounce delay
    if (digitalRead(button1Pin) == LOW) {
      // Code to set hour
      lcd.setCursor(0, 1);
      lcd.print("Set Hour: ");
      setHour = (setHour + 1) % 24; // Increment hour
      lcd.print(setHour);
      delay(1000); // Wait for 1 second to avoid multiple increments
    }
  }
  if (digitalRead(button2Pin) == LOW) {
    delay(50); // Debounce delay
    if (digitalRead(button2Pin) == LOW) {
      // Code to set minute
      lcd.setCursor(0, 1);
      lcd.print("Set Minute: ");
      setMinute = (setMinute + 1) % 60; // Increment minute
      lcd.print(setMinute);
      delay(1000); // Wait for 1 second to avoid multiple increments
    }
  }
  if (digitalRead(button3Pin) == LOW) {
    delay(50); // Debounce delay
    if (digitalRead(button3Pin) == LOW) {
      // Code to set number of dosages
      lcd.setCursor(0, 1);
      lcd.print("Set Dosages: ");
      setDosages = (setDosages + 1) % 10; // Increment dosages
      lcd.print(setDosages);
      delay(1000); // Wait for 1 second to avoid multiple increments
    }
  }
  if (digitalRead(button4Pin) == LOW) {
    delay(50); // Debounce delay
    if (digitalRead(button4Pin) == LOW) {
      // Code to confirm settings
      lcd.setCursor(0, 1);
      lcd.print("Confirm");
      nextMedicineTime = DateTime(now.year(), now.month(), now.day(), setHour, setMinute, 0);
      delay(1000); // Wait for 1 second to avoid multiple confirmations
    }
  }

  // Check if it's time for medicine
  if (now >= nextMedicineTime) {
    digitalWrite(buzzerPin, HIGH);
    delay(1000);
    digitalWrite(buzzerPin, LOW);
    // Set next medicine time based on dosages
    nextMedicineTime = nextMedicineTime + TimeSpan(0, 24 / setDosages, 0, 0);
  }

  delay(1000); // Update every second
}