#include <Wire.h>
#include "RTClib.h"
#include <LiquidCrystal_I2C.h>
RTC_DS1307 DS1307;
LiquidCrystal_I2C LCD(0x27,16,2);
DateTime casD;
byte sees = 0;
bool menu = 0;

int secs;
int mins;
int hours;
int days;
int months;
int years;

void setup(){
    LCD.init();
  LCD.backlight();

  pinMode(9, INPUT_PULLUP);
  pinMode(10, INPUT_PULLUP);
  pinMode(11, INPUT_PULLUP);

  DS1307.begin();

  DS1307.adjust(DateTime(__DATE__, __TIME__));

  
}

void loop(){
  casD = DS1307.now();
if (!digitalRead(11)){
    menu = true;
    sees = 1;
    mins = casD.minute();
    hours = casD.hour();
    days = casD.day();
    months = casD.month();
    years = casD.year();
    delay(250);
  }

if (!menu){
    Zero();
 
  }
  

  if (menu){
    switch (sees){
      case 1: Editmins();
      break;
      case 2: Edithours();
      break;
      case 3: Editdays();
      break;
      case 4: Editmonths();
      break;
      case 5: Edityears();
      break;
      case 6: Ende();
      break;
    }
  }
}

  void Zero() {
    LCD.setCursor(0,0);
    LCD.print("     ");
    LCD.print(casD.hour());
    LCD.print(":");
    LCD.print(casD.minute());
    LCD.print("          ");
    LCD.setCursor(0,1);
    LCD.print("   ");
    LCD.print(casD.day());
    LCD.print(".");
    LCD.print(casD.month());
    LCD.print(".");
    LCD.print(casD.year());
    LCD.println("           ");
  }

  void Editmins() {
    
    LCD.setCursor(0,0);
    LCD.print("  ");
    LCD.print("EDITING MINS    ");
    LCD.setCursor(0,1);
    LCD.print(hours < 10 ? "0" + String(hours) : hours);
    LCD.print(":");
    LCD.print(mins < 10 ? "0" + String(mins) : mins);
    LCD.print("            ");

    if (!digitalRead(10)){
      mins--;
      mins < 0 ? mins = 59 : mins;
      delay (200);
    }

    if (!digitalRead(9)){
      mins++;
      mins > 59 ? mins = 0 : mins;
      delay (200);
    }

    if (!digitalRead(11)){
      delay(200);
      sees = 2;
      Edithours();
    }
  }


  void Edithours() {
    LCD.setCursor(0,0);
    LCD.print("  ");
    LCD.print("EDITING HOURS ");
    LCD.setCursor(0,1);
    LCD.print(hours < 10 ? "0" + String(hours) : hours);
    LCD.print(":");
    LCD.print(mins < 10 ? "0" + String(mins) : mins);
  

  if (!digitalRead(10)) {
    hours--;
    hours < 0 ? hours = 23 : hours;
    hours > 23 ? hours = 0 : hours;
    delay (200);

  }

  if (!digitalRead(9)){
      hours++;
      hours > 59 ? hours = 0 : hours;
      delay (200);
  }

      if (!digitalRead(11)){
      delay(200);
      sees = 3;
      Editdays();
    }
  }


void Editdays() {
    LCD.setCursor(0,0);
    LCD.print("  ");
    LCD.print("EDITING DAYS ");
    LCD.setCursor(0,1);
    LCD.print(days < 10 ? "0" + String(days) : days);
    LCD.print(".");
    LCD.print(months < 10 ? "0" + String(months) : months);
    LCD.print(".");
    LCD.print(years < 10 ? "0" + String(years) : years);
  

    if (!digitalRead(10)){
    days--;
    days < 0 ? days = 31 : days;
    days > 31 ? days = 0 : days;
    delay (200);

  }

  if (!digitalRead(9)){
      days++;
      days > 31 ? days = 0 : days;
      delay (200);
  }
  
      if (!digitalRead(11)){
      delay(200);
      sees = 4;
      Editmonths();
    }
}
    void Editmonths(){
    LCD.setCursor(0,0);
    LCD.print("  ");
    LCD.print("EDITING MONTHS ");
    LCD.setCursor(0,1);
    LCD.print(days < 10 ? "0" + String(days) : days);
    LCD.print(".");
    LCD.print(months < 10 ? "0" + String(months) : months);
    LCD.print(".");
    LCD.print(years < 10 ? "0" + String(years) : years);
  

    if (!digitalRead(10)){
    months--;
    months < 0 ? months = 12 : months;
    months > 12 ? months = 0 : months;
    delay (200);

  }

  if (!digitalRead(9)){
      months++;
      months > 12 ? months = 0 : months;
      delay (200);
  }
  
      if (!digitalRead(11)){
      delay(200);
      sees = 5;
      Edityears();
    }
    }
    void Edityears(){
    LCD.setCursor(0,0);
    LCD.print("  ");
    LCD.print("EDITING YEARS ");
    LCD.setCursor(0,1);
    LCD.print(days < 10 ? "0" + String(days) : days);
    LCD.print(".");
    LCD.print(months < 10 ? "0" + String(months) : months);
    LCD.print(".");
    LCD.print(years < 10 ? "0" + String(years) : years);
  

    if (!digitalRead(10)){
    years--;
    delay (200);

  }

  if (!digitalRead(9)){
      years++;
      delay (200);
  }
  
      if (!digitalRead(11)){
      delay(200);
    sees=6;
    Ende();
    }
  }

  void Ende() {
    LCD.clear();
    LCD.setCursor(0, 0);
    LCD.print(" ");
    LCD.print("Je to tam sefe");
  sees=0;
  DS1307.adjust(DateTime(years, months, days, hours, mins, 0));
  delay(2000);
  menu = false;
  loop();
  }