#include<RTClib.h>
#include<ezButton.h>
#include <LiquidCrystal_I2C.h>

int year = 0;
int month = 0;
int day = 0;
int hour = 0;
int minute = 0;
int second = 0;
RTC_DS1307 rtc;

//  encoder variables
byte clk = 2;
byte dt = 3;
byte sw = 4;

ezButton button(sw);

//  counting rotations
int counter = 0;
int prev_counter = -1;
int flag = 1;

String rtc_date = "";
String rtc_time = "";

// lcd object : setting register address 0x27
LiquidCrystal_I2C lcd(0x27 , 20 , 4);

void setup() {

  Serial.begin(9600);

   if (!rtc.begin()) {
  //   Serial.println("RTC not initialised");
     while (true);
   }
  // Serial.println("RTC found");


  attachInterrupt(digitalPinToInterrupt(clk), encoder, FALLING);

  button.setDebounceTime(25);
    // initializing LCD
  lcd.init(); // initialize the lcd.
  lcd.clear(); // clears the screen and moves the cursor to the top left corner.
  lcd.backlight(); // turn on the backlight.

  lcd.clear();
  lcd_print(0,0,"RTC found");
  delay(1000);
  lcd_print(0,0,"Hi I am Cuckoo!");
  delay(2000);
}

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

void mode_selector() {

  if (prev_counter != counter  &&  flag  ==  1) {
    if (counter  ==  0) {
      lcd.clear();
      lcd_print(0,0,"Date and Time");
    }
    else if (counter  ==  1) {
      lcd.clear();
      lcd_print(0,0,"Set Alarm");
    }
    else if (counter  ==  2) {
      lcd.clear();
      lcd_print(0,0,"Stopwatch");
    }
    else if (counter  ==  3) {
      lcd.clear();
      lcd_print(0,0,"Countdown Timer");
    }
    flag = 0;
    
  }
}



void loop() {

  button.loop();
  if (button.isPressed())select_mode();

  //  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();

  //  for better working of simulator
  delay(10);
}

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 select_mode(){
  if (counter == 0)get_time();
  else if (counter == 1)set_alarm();
  else if (counter == 2)stopwatch();
  else countdown();
}
void lcd_print(int x , int y , String message){
lcd.setCursor(x,y);
lcd.print(message);
}
void get_time(){
  while(true){

    current_time();
      String current_date = "Date: "+String(day)+ "/" + String(month) + "/" + String(year);
      String current_time = "Time : "+String(hour) + "/" + String(minute)+ "/" + String(second);
    lcd_print(0, 0, "Date and Time");
    lcd_print(0,1, current_date);
    lcd_print(0,2, current_time);

  }
}

void set_alarm(){

}
void stopwatch(){
  int stopwatch_hour, stopwatch_minute, stopwatch_second = 0;
  int last_second = 0;

  while (true) {
    //  breaking loop if button pressed
    button.loop();
    if (button.isPressed()) {
      prev_counter = -1;
      flag = 1;

      delay(5000);
      lcd.clear();
      break;
    }
      //  tracking current time to get the 'seconds' variable
    current_time();

    //  stopwatch algo
    if (abs(second - last_second) >= 1) {
      last_second = second;
      String stopwatch_time = String(stopwatch_hour) +
                              " : " + String(stopwatch_minute) +
                              " : " + String(stopwatch_second);
      lcd.clear();
      lcd_print(0, 0, "Stopwatch");
      lcd_print(0, 1, String(stopwatch_time));
      stopwatch_second++;
    }

    //  condition check
    if (stopwatch_second > 59) {
      stopwatch_second = 0;
      stopwatch_minute++;
    }
    else if (stopwatch_minute > 59) {
      stopwatch_minute = 0;
      stopwatch_hour++;
    }
    else if (stopwatch_hour > 24) {
      stopwatch_second, stopwatch_minute, stopwatch_hour = 0;
    }
  }
}
void countdown(){
  
}
void current_time(){
  // getting currrent time and date
  DateTime current = rtc.now();

  year = current.year();
  month = current.month();
  day = current.day();
  hour = current.hour();
  minute = current.minute();
  second = current.second();
}