#include <RTClib.h>
#include <ezButton.h>

RTC_DS1307 rtc;

String rtc_date = "";
String rtc_time = "";
byte clk = 2;
byte dt = 3;
byte sw = 4;
int counter = 0;
int prev_counter = 0;
int flag = 0;
ezButton button(sw);


void setup(){

  Serial.begin(9600);
  button.setDebounceTime(25);
  
  attachInterrupt(digitalPinToInterrupt(clk) , encoder , FALLING);
// (interupt, function, mode)
  if (!rtc.begin()){
    Serial.println("RTC not initialised");
    while(true);
  }
  Serial.println("RTC found");
}




void loop(){
  
  //  RTC date and time
  DateTime dt = rtc.now();
  rtc_date = get_date(dt);
  Serial.println(rtc_date);
  rtc_time = get_time(dt);
  Serial.println(rtc_time);
  mode_selector();
  button.loop();
  if (button.isPressed())select_mode();
  //  for better working of simulator
  delay(1000);
  
}

String get_time(DateTime current){

  int hour = current.hour();
  int minute = current.minute();
  int second = current.second();

  String current_time = "Time : " + String(hour) + ":" + String(minute) + 
                        ":" + String(second);

  return current_time;
}

String get_date(DateTime current){

  int year = current.year();
  int month = current.month();
  int day = current.day();

  String current_date = "Date : " + String(day) + "/" + String(month) + 
                "/" + String(year);
  
  return current_date;
}

void encoder(){
  if (digitalRead(dt) == HIGH)counter++;
  else counter--;
counter = constrain(counter , 0 , 3);
//(,lower,upper)
flag = 1;
}

void mode_selector(){
  if (counter == 0){
    Serial.println("Current Time");
  }
  else if (counter == 1){
    Serial.println("Set Alarm");
  }
  else if (counter == 2){
    Serial.println("Stopwatch");
  }
  else if (counter == 3){
    Serial.println("World clock");
  }
  flag = 0;
}
void select_mode(){
  if(counter == 0)Serial.println("Date and Time mode is selected");
  if(counter == 1)Serial.println("Set Alarm mode is selected");
  if(counter == 2)Serial.println("Stopwatch mode is selected");
  if(counter == 3)Serial.println("Countdown Timer mode is selected");
}