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

RTC_DS1307 rtc;

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

const int potPin = A0; // connect potentiometer to A0 pin
int potValue = 0;

struct Medicine {
  const char *name;
  int dose;
  int hour;
  int minute;
};

Medicine medicines[] = {
  {"Medicine 1", 1, 9, 0},
  {"Medicine 2", 2, 12, 0},
  {"Medicine 3", 1, 15, 0}
};
int numMedicines = sizeof(medicines) / sizeof(medicines[0]);

const int buzzerPin = 8;
const int buttonPin = 7;
const int ledPin = 9;

void setup() {
  pinMode(buttonPin, INPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(ledPin, OUTPUT);
  lcd.begin(16, 2);
  lcd.print("Medicine Alarm");
  delay(2000);
  Wire.begin();
  rtc.begin();
  if (!rtc.isrunning()) {
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }
  pinMode(potPin, INPUT);
}

void loop() {
  potValue = analogRead(potPin);
  int minutesToAdd = map(potValue, 0, 1023, 0, 60);
  DateTime now = rtc.now() + TimeSpan(0, minutesToAdd, 0, 0);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print(now.hour(), DEC);
  lcd.print(":");
  if (now.minute() < 10) {
    lcd.print("0");
  }
  lcd.print(now.minute(), DEC);
  lcd.print(" ");
  lcd.print(now.day(), DEC);
  lcd.print("/");
  lcd.print(now.month(), DEC);
  lcd.print("/");
  lcd.print(now.year(), DEC);
  lcd.setCursor(0, 1);
  for (int i = 0; i < numMedicines; i++) {
    lcd.print(medicines[i].name);
    lcd.print(": ");
    lcd.print(medicines[i].dose);
    lcd.print("x ");
    lcd.print(medicines[i].hour, DEC);
    lcd.print(":");
    if (medicines[i].minute < 10) {
      lcd.print("0");
    }
    lcd.print(medicines[i].minute, DEC);
    lcd.print("   ");
    if (now.hour() == medicines[i].hour && now.minute() == medicines[i].minute) {
      digitalWrite(ledPin, HIGH);
      while (digitalRead(buttonPin) == LOW) {
        digitalWrite(buzzerPin, HIGH);
        delay(500);
        digitalWrite(buzzerPin, LOW);
        delay(500);
      }
      digitalWrite(ledPin, LOW);
    }
  }
  delay(1000);
}