/*
Button pins:
SwitchScreen = 1
Confirm = 2
Up = 3
Down = 4
Next = 5
Back = 6
PILLSWITCH = 8
*/

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <RTClib.h>
RTC_DS1307 rtc;

LiquidCrystal_I2C lcd(7, 8, 9, 10, 11, 12);

const int switchScreenPin = 1;
int switchScreenPinState = 0;

const int ConfirmPin = 2;
int confirmPinState = 0;

const int upPin = 3;
int upPinState = 0;

const int downPin = 4;
int downPinState = 0;

const int nextPin = 5;
int nextPinState = 0;

const int backPin = 6;
int backPinState = 0;

const int pillSwitch = 8;
int pillSwitchState = 0;

const int buzzerPin = 10;
int buzzerPinState = 0;

int menu = 0;
int amenu = 0;
int hourupg;
int minupg;
const int debounce = 35;

/*
   function to update RTC time using user input
*/
void updateRTC()
{
  lcd.clear();  // clear LCD display
  lcd.setCursor(0, 0);
  lcd.print("Edit Mode...");

  // ask user to enter new date and time
  const char txt[6][15] = { "year [4-digit]", "month [1~12]", "day [1~31]",
                            "hours [0~23]", "minutes [0~59]", "seconds [0~59]"};
  String str = "";
  long newDate[6];

  while (Serial.available()) {
    Serial.read();  // clear serial buffer
  }

  for (int i = 0; i < 6; i++) {

    Serial.print("Enter ");
    Serial.print(txt[i]);
    Serial.print(": ");

    while (!Serial.available()) {
      ; // wait for user input
    }

    str = Serial.readString();  // read user input
    newDate[i] = str.toInt();   // convert user input to number and save to array

    Serial.println(newDate[i]); // show user input
  }

  // update RTC
  rtc.adjust(DateTime(newDate[0], newDate[1], newDate[2], newDate[3], newDate[4], newDate[5]));
  Serial.println("RTC Updated!");
}

/*
   function to update LCD text
*/
void updateLCD()
{

  /*
     create array to convert digit days to words:

     0 = Sunday    |   4 = Thursday
     1 = Monday    |   5 = Friday
     2 = Tuesday   |   6 = Saturday
     3 = Wednesday |
  */
  const char dayInWords[7][4] = {"SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT"};

  /*
     create array to convert digit months to words:

     0 = [no use]  |
     1 = January   |   6 = June
     2 = February  |   7 = July
     3 = March     |   8 = August
     4 = April     |   9 = September
     5 = May       |   10 = October
     6 = June      |   11 = November
     7 = July      |   12 = December
  */
  const char monthInWords[13][4] = {" ", "JAN", "FEB", "MAR", "APR", "MAY", "JUN", 
                                         "JUL", "AUG", "SEP", "OCT", "NOV", "DEC"};

  // get time and date from RTC and save in variables
  DateTime rtcTime = rtc.now();

  int ss = rtcTime.second();
  int mm = rtcTime.minute();
  int hh = rtcTime.twelveHour();
  int DD = rtcTime.dayOfTheWeek();
  int dd = rtcTime.day();
  int MM = rtcTime.month();
  int yyyy = rtcTime.year();

  // move LCD cursor to upper-left position
  lcd.setCursor(0, 0);

  // print date in dd-MMM-yyyy format and day of week
  if (dd < 10) lcd.print("0");  // add preceeding '0' if number is less than 10
  lcd.print(dd);
  lcd.print("-");
  lcd.print(monthInWords[MM]);
  lcd.print("-");
  lcd.print(yyyy);

  lcd.print("  ");
  lcd.print(dayInWords[DD]);

  // move LCD cursor to lower-left position
  lcd.setCursor(0, 1);

  // print time in 12H format
  if (hh < 10) lcd.print("0");
  lcd.print(hh);
  lcd.print(':');

  if (mm < 10) lcd.print("0");
  lcd.print(mm);
  lcd.print(':');

  if (ss < 10) lcd.print("0");
  lcd.print(ss);

  if (rtcTime.isPM()) lcd.print(" PM"); // print AM/PM indication
  else lcd.print(" AM");
}

void homeScreen()
{
  DateTime rtcTime = rtc.now();
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Date: ");
  if (rtcTime.day() < 10) lcd.print("0");  // add '0' if number is less than 10 i.e 05:07
  lcd.print(rtcTime.day());
  lcd.print(":");
  if (rtcTime.minute() < 10) lcd.print("0");
  lcd.print(rtcTime.minute());
  lcd.print(":");
  lcd.print(rtcTime.year());
  
  if (rtcTime.isPM()) lcd.print(" PM");
  else lcd.print(" AM");
}


void alarmScreen()
{
  if(amenu==0)
  {
    AlarmSetHour();
  }
  else if (amenu==1)
  {
    AlarmSetMinute();
  }
  
  
  
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Alarm 1: ");
  
  lcd.setCursor(0,1);
  lcd.print("Alarm 1: ");
  
}


void setup() {
  Serial.begin(9600); // initialize serial

  lcd.init();       // initialize lcd
  lcd.backlight();  // switch-on lcd backlight

  rtc.begin();       // initialize rtc

  Serial.begin(9600);
  pinMode(8, INPUT); //pillSwitch button
  pinMode(10, OUTPUT); //Alarm output to buzzer and LED

}

void loop() {
  
  if(menu == 0)
  {
    homeScreen();
  }
  else if (menu == 1)
  {
    alarmScreen();
  }

    byte pillSwitchState = digitalRead(4);
  if (pillSwitchState == HIGH) && ( (rtcTime.twelveHour() == AlarmSetHour())
  && (rtcTime.minute() == AlarmSetMinute()))
    //Combines this HIGH state with time match
    //When the time comes for calendar settings, add rtcTime.day, .year, etc.
  
}
}


void AlarmSetHour()
{
// time setting
  lcd.clear();
  DateTime now = rtc.now();

  lcd.setCursor(0,0);
  lcd.print("Set Hour:");
  lcd.setCursor(0,1);
  lcd.print(hourupg,DEC);
 
  while(!digitalRead(1)){
  if(digitalRead(2)==HIGH)
  {
    if(hourupg==23)
    {
      hourupg=0;
    }
    else
    {
      hourupg=hourupg+1;
    }
    delay(debounce);
  
  }
   if(digitalRead(3)==HIGH)
  {
    if(hourupg==0)
    {
      hourupg=23;
    }
    else
    {
      hourupg=hourupg-1;
    }
    delay(debounce);
  }
  DateTime now = rtc.now();
  lcd.setCursor(0,0);
  lcd.print("Set Hour:");
  lcd.setCursor(0,1);
  lcd.print(hourupg,DEC);
  lcd.print(" ");
  }
     menu=2;
     delay(debounce);
}

void AlarmSetMinute()
{
// Setting the minutes

  lcd.clear();

  lcd.setCursor(0,0);
  lcd.print("Set Minutes:");
  lcd.setCursor(0,1);
  lcd.print(minupg,DEC);


  while(!digitalRead(1)){
    if(digitalRead(2)==HIGH)
    {
      if (minupg==59)
      {
        minupg=0;
      }
      else
      {
        minupg=minupg+1;
      }
      delay(debounce);
    }
     if(digitalRead(3)==HIGH)
    {
      if (minupg==0)
      {
        minupg=59;
      }
      else
      {
        minupg=minupg-1;
      }
      delay(debounce);
    }
  lcd.setCursor(0,0);
  lcd.print("Set Minutes:");
  lcd.setCursor(0,1);
  lcd.print(minupg,DEC);
  lcd.print(" ");
  //delay(200);
  }
  menu=3;
  delay(debounce);
}