#include <LiquidCrystal.h>
#include <Wire.h>
#include <TimeLib.h>
#include <DS1307RTC.h>
const int ledPin[] = {6,7,8,9}; 
const int btn[] = {10,11,12,13};
const int rs = 5, en = 4, d4 = 3, d5 = 2, d6 = 1, d7 = 0;
int timerStart[4][3] = {{0, 0, 0}, {0, 0, 0}, {0, 0, 0}, {0, 0, 0}};
int timerFinish[4][3] = {{0, 0, 0}, {0, 0, 0}, {0, 0, 0}, {0, 0, 0}};
int count = 0, flashCountCol = 5, flashCountRow = 0;
tmElements_t tm;

LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

void setup() {
  lcd.begin(16, 2);

  
  for (int i = 6; i < 10; i++) {
    pinMode(i, OUTPUT);
  }
  for (int i = 10; i < 14; i++) {
    pinMode(i, INPUT_PULLUP);
  }
}

void loop() {
  if (RTC.read(tm)) {
    switch (count) {
      case 0:
        scrn("Time: ", "Date: ");
        break;
      case 1:
        timer("Start1: ", "Finish: ", timerStart, timerFinish);
        break;
      case 2:
        timer("Start2: ", "Finish: ", timerStart, timerFinish);
        break;
      case 3:
        timer("Start3: ", "Finish: ", timerStart, timerFinish);
        break;
      case 4:
        timer("Start4: ", "Finish: ", timerStart, timerFinish);
        break;
      
    }
  } else {
    lcd.setCursor(0, 0);
    lcd.print("RTC read error");
  }
  
  delay(150);

  if(!digitalRead(btn[0])){
    while(!digitalRead(10));
    delay(10);
    count += 1;
    if(count ==5) count = 0;
    flashCountCol = 5;
    flashCountRow = 0;
  }

  if( !digitalRead(btn[1])){
    while(!digitalRead(11));
    delay(10);
    flashCountCol += 3;
    if(flashCountCol >15 && flashCountRow == 1){ flashCountCol = 5; flashCountRow = 0;}
    else if(flashCountCol >15){ flashCountCol = 8; flashCountRow = 1;}
  }
  if(count > 0)
    switch(flashCountCol){
      case 8: flash(flashCountCol, flashCountRow);
      break;
      case 11: flash(flashCountCol, flashCountRow);
      break;
      case 14: flash(flashCountCol, flashCountRow);
      break;
    }

  if(!digitalRead(btn[2])){
    delay(10);
    if(flashCountCol == 8 && flashCountRow ==0){
      timerStart[count - 1][0] += 1;
      if(timerStart[count - 1][0] == 25) timerStart[count - 1][0] = 0;
    }
    else if(flashCountCol == 11 && flashCountRow ==0){
      timerStart[count - 1][1] += 1;
      if(timerStart[count - 1][1] == 60) timerStart[count - 1][1] = 0;
    }
    else if(flashCountCol == 14 && flashCountRow ==0){
      timerStart[count - 1][2] += 1;
      if(timerStart[count - 1][2] == 60) timerStart[count - 1][2] = 0;
    }
    else if(flashCountCol == 8 && flashCountRow ==1){
      timerFinish[count - 1][0] += 1;
      if(timerStart[count - 1][0] == 25) timerStart[count - 1][0] = 0;
    }
    else if(flashCountCol == 11 && flashCountRow ==1){
      timerFinish[count - 1][1] += 1;
      if(timerStart[count - 1][1] == 60) timerStart[count - 1][1] = 0;
    }
    else if(flashCountCol == 14 && flashCountRow ==1){
      timerFinish[count - 1][2] += 1;
      if(timerStart[count - 1][2] == 60) timerStart[count - 1][2] = 0;
    }
  }
  if(!digitalRead(btn[3])){
    delay(10);
    if(flashCountCol == 8 && flashCountRow ==0){
      timerStart[count - 1][0] -= 1;
      if(timerStart[count - 1][0] == -1) timerStart[count - 1][0] = 24;
    }
    else if(flashCountCol == 11 && flashCountRow ==0){
      timerStart[count - 1][1] -= 1;
      if(timerStart[count - 1][1] == -1) timerStart[count - 1][1] = 59;
    }
    else if(flashCountCol == 14 && flashCountRow ==0){
      timerStart[count - 1][2] -= 1;
      if(timerStart[count - 1][2] == -1) timerStart[count - 1][2] = 59;
    }
    else if(flashCountCol == 8 && flashCountRow ==1){
      timerFinish[count - 1][0] -= 1;
      if(timerFinish[count - 1][0] == -1) timerFinish[count - 1][0] = 24;
    }
    else if(flashCountCol == 11 && flashCountRow ==1){
      timerFinish[count - 1][1] -= 1;
      if(timerFinish[count - 1][1] == -1) timerFinish[count - 1][1] = 59;
    }
    else if(flashCountCol == 14 && flashCountRow ==1){
      timerFinish[count - 1][2] -= 1;
      if(timerFinish[count - 1][2] == -1) timerFinish[count - 1][2] = 59;
    }
  }

  if(timerStart[0][0] == tm.Hour && timerStart[0][1] == tm.Minute && timerStart[0][2] == tm.Second){
    digitalWrite(ledPin[0], HIGH);
  }
  if(timerFinish[0][0] == tm.Hour && timerFinish[0][1] == tm.Minute && timerFinish[0][2] == tm.Second){
    digitalWrite(ledPin[0], LOW);
  }
  if(timerStart[1][0] == tm.Hour && timerStart[1][1] == tm.Minute && timerStart[1][2] == tm.Second){
    digitalWrite(ledPin[1], HIGH);
  }
  if(timerFinish[1][0] == tm.Hour && timerFinish[1][1] == tm.Minute && timerFinish[1][2] == tm.Second){
    digitalWrite(ledPin[1], LOW);
  }
  if(timerStart[2][0] == tm.Hour && timerStart[2][1] == tm.Minute && timerStart[2][2] == tm.Second){
    digitalWrite(ledPin[2], HIGH);
  }
  if(timerFinish[2][0] == tm.Hour && timerFinish[2][1] == tm.Minute && timerFinish[2][2] == tm.Second){
    digitalWrite(ledPin[2], LOW);
  }
  if(timerStart[3][0] == tm.Hour && timerStart[3][1] == tm.Minute && timerStart[3][2] == tm.Second){
    digitalWrite(ledPin[3], HIGH);
  }
  if(timerFinish[3][0] == tm.Hour && timerFinish[3][1] == tm.Minute && timerFinish[3][2] == tm.Second){
    digitalWrite(ledPin[3], LOW);
  }


}

void flash(int posCol, int posRow){
 
    lcd.setCursor(posCol,posRow);
    lcd.print("  ");
    delay(150);
}

void scrn(String title1, String title2) {
  lcd.setCursor(0, 0);
  lcd.print(title1);
  print2digits(tm.Hour);
  lcd.print(":");
  print2digits(tm.Minute);
  lcd.print(":");
  print2digits(tm.Second);
  lcd.print("  ");
  lcd.setCursor(0, 1);
  lcd.print(title2);
  lcd.print(tmYearToCalendar(tm.Year));
  lcd.print("/");
  print2digits(tm.Month);
  lcd.print("/");
  print2digits(tm.Day);
}
void timer(String title1, String title2,int timerStart[4][3],int timerFinish[4][3]){
  lcd.setCursor(0, 0);
  lcd.print(title1);
  for(int i = 0; i<3;i++){
  print2digits(timerStart[count -1][i]);
  if(i < 2) lcd.print(":");
  }

  lcd.setCursor(0, 1);
  lcd.print(title2);
  for(int i = 0; i<3;i++){
    print2digits(timerFinish[count -1][i]);
    if(i < 2) lcd.print(":");
  }

}

void print2digits(int number) {
  if (number >= 0 && number < 10) {
    lcd.print('0');
  }
  lcd.print(number);
}