#include <Wire.h>                   // for I2C communication
#include <LiquidCrystal_I2C.h>      // for LCD
#include <RTClib.h>                 // for RTC
#include <Button.h>                 // for debounce buttons
#include <SPI.h>
#include <Timer.h>
//#include <nRF24L01.h>
//#include <RF24.h>

int HomeScore=0;   //Score for Home
int VisitorsScore=0; // Score for visitors
//int PlayTime=600; // 10 minutes playtime in seconds
int Round=1; // 1e round is first half , 2 is 2e half.
int t=0;
int s=0;
int m=0;

// Countdown Timer for playtime
unsigned long startTime;
unsigned long currentTime;
unsigned long elapsedTime;
unsigned long remainingTime;
unsigned long pausedTime = 0;
unsigned long COUNTDOWN_TIME = 600; // 5 minutes in seconds
int Pause_Time=1;   // 1 for pause 0 for running

Button switchHomeP(2);        // plus button Score Home
Button switchHomeM(3);        // Minus Button Score Homr
Button switchVitorsP(4);      // Plus Button Score Visitors
Button switchVitorsM(5);      // Minus Button Score Visitors
Button PlaytimeP(6);          // playtime plus 1 sec
Button PlaytimeM(7);          // playtime minus 1 sec
Button PlaytimeS(8);          // Playtime Start Countdown from 10min to 0
Button greencardHome(14);            // 2 minute wait greeg card
Button greencardVisitors(15);        // 2 minute wait green card
Button ShotClockStart(16);    // Shotclock start, countdown from 60 sec
Button ShotClockpause(17);    // Schotclock pause
Button ShotClockStop(18);     // stop shotclock
Button MirroScoreboard(19);   // mirror scoreboard (NOT THE REMOTE !!!!!!)
// reset button ?

LiquidCrystal_I2C lcd(0x27, 16, 2); // create LCD with I2C address 0x27, 16 characters per line, 2 lines
RTC_DS3231 rtc;                     // create rtc for the DS3231 RTC module, address is fixed at 0x68

/*
   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()
{

  // 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.hour();


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


  // move LCD cursor to upper-left position
  lcd.setCursor(4, 0);
  // Display 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);

  // move LCD cursor to lower-left position
  lcd.setCursor(0, 1);
    if (HomeScore < 10) lcd.print("0"); lcd.print(HomeScore);
      t = remainingTime; s = t % 60; t = (t - s)/60; m = t % 60;
  lcd.setCursor(6, 1);
    //lcd.print(PlayTime);
    if (m < 10) lcd.print("0");
      lcd.print(m);
      lcd.print(':');
    if (s < 10) lcd.print("0");
      lcd.print(s);

  lcd.setCursor(14, 1);
    if (VisitorsScore < 10) lcd.print("0");
      lcd.print(VisitorsScore); 
}

void setup()
{

startTime = millis(); // Record the starting time

switchHomeP.begin();
switchHomeM.begin();
switchVitorsP.begin();
switchVitorsM.begin();
PlaytimeP.begin();
PlaytimeM.begin();
PlaytimeS.begin();

  // Set input pins
  Serial.begin(9600); // initialize serial
  lcd.init();       // initialize lcd
  lcd.backlight();  // switch-on lcd backlight
  rtc.begin();       // initialize rtc
}

void loop() 
{

  currentTime = millis(); // Get the current time
  elapsedTime = (currentTime - startTime) / 1000; // Calculate elapsed time in seconds
 //if (elapsedTime <= COUNTDOWN_TIME) {remainingTime = COUNTDOWN_TIME - elapsedTime;}

  if (elapsedTime <= COUNTDOWN_TIME && Pause_Time == 1) { pausedTime = elapsedTime;
        Serial.print("Pause  ");
        Serial.print("  remainingTime:");Serial.print(remainingTime);
        Serial.print("  COUNTDOWN_TIME:");Serial.print(COUNTDOWN_TIME);
        Serial.print("  pausedTime:");Serial.print(pausedTime);
        Serial.print("  elapsedTime:");Serial.print(elapsedTime);

  }   //pause time

  if (elapsedTime <= COUNTDOWN_TIME && Pause_Time == 0) 
      {

      remainingTime = COUNTDOWN_TIME - elapsedTime + pausedTime; //running time
        Serial.print("running  ");
        Serial.print("  remainingTime:");Serial.print(remainingTime);
        Serial.print("  COUNTDOWN_TIME:");Serial.print(COUNTDOWN_TIME);
        Serial.print("  pausedTime:");Serial.print(pausedTime);
        Serial.print("  elapsedTime:");Serial.print(elapsedTime);
        }



     
  


  ReadButtons(); // Read Buttons on Remote
  updateLCD();  // update LCD text

  if (Serial.available()) {
    char input = Serial.read();
    if (input == 'u') updateRTC();  // update RTC time
  }
}

void ReadButtons() {
                      if (switchHomeP.pressed())  {HomeScore++;}
                      if (switchHomeM.pressed())  {HomeScore--;}
                      if (switchVitorsP.pressed()){VisitorsScore++;}
                      if (switchVitorsM.pressed()){VisitorsScore--;}
                      if (PlaytimeP.pressed())    {remainingTime++;} 
                      if (PlaytimeM.pressed())    {remainingTime--;}
                      if (PlaytimeS.pressed())    {Pause_Time = !Pause_Time;}
                      

// correct unwanted results
          if (HomeScore==-1) {HomeScore=0;}  
          if (VisitorsScore==-1) {VisitorsScore=0;}                      
                    }