// Arduino Pins
const int dataPin = 2;
const int clockPin = 3;
const int latchPin = 4;
const int btnHomeScore = 5;
const int btnAwayScore = 7;      
const int btnHomeFoul = 6;      
const int btnAwayFoul = 8;
const int btnShift = 9;

const byte digitPatterns[10] = {
  0b00111111, // 0
  0b00000110, // 1
  0b01011011, // 2
  0b01001111, // 3
  0b01100110, // 4
  0b01101101, // 5
  0b01111101, // 6
  0b00000111, // 7
  0b01111111, // 8
  0b01101111  // 9
};

int valBtnHomeScore = 1;
int valBtnAwayScore = 1;
int valBtnHomeFoul = 1;
int valBtnAwayFoul = 1;
int scorePlayerH = 0;
int scorePlayerA = 0;
int scorePlayerHF = 0;

int digitA1 = 0;
int digitA2 = 0;
int digitA3 = 0;
int digitH1 = 0;
int digitH2 = 0;
int digitH3 = 0;
int digitHF = 0;

void setup() {
  pinMode(dataPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(latchPin, OUTPUT);
  pinMode(btnHomeScore, INPUT);
  pinMode(btnAwayScore, INPUT);
  pinMode(btnHomeFoul, INPUT);
  pinMode(btnAwayFoul, INPUT);
  pinMode(btnShift, INPUT);

  displayScore();
}

void loop() {
  readButtons();

  if (valBtnHomeScore == 0) {
    scorePlayerH += 1;
    if (scorePlayerH >= 200) { scorePlayerH = 199; }
    displayScore();
    while (valBtnHomeScore == 0) {
      delay(100);
      readButtons();
    }
  }

    if (valBtnAwayScore == 0) {
    scorePlayerA += 1;
    if (scorePlayerA >= 200) { scorePlayerA = 199; }
    displayScore();
    while (valBtnAwayScore == 0) {
      delay(100);
      readButtons();
    }
  }
}

void displayScore() {
  digitH3 = (scorePlayerH % 10) / 1;
  digitH2 = (scorePlayerH % 100) / 10;
  digitH1 = (scorePlayerH % 1000) / 100;
  digitA3 = (scorePlayerA % 10) / 1;
  digitA2 = (scorePlayerA % 100) / 10;
  digitA1 = (scorePlayerA % 1000) / 100;
  digitHF = (scorePlayerHF % 10) / 1;

  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, MSBFIRST, digitPatterns[digitHF]); // Player B Thousands
  shiftOut(dataPin, clockPin, MSBFIRST, digitPatterns[digitA3]); // Player B Thousands
  shiftOut(dataPin, clockPin, MSBFIRST, digitPatterns[digitA2]); // Player B Hundreds
  shiftOut(dataPin, clockPin, MSBFIRST, digitPatterns[digitA1]); // Player B Tens
  shiftOut(dataPin, clockPin, MSBFIRST, digitPatterns[digitH3]); // Player A Thousands
  shiftOut(dataPin, clockPin, MSBFIRST, digitPatterns[digitH2]); // Player A Hundreds
  shiftOut(dataPin, clockPin, MSBFIRST, digitPatterns[digitH1]); // Player A Tens
  digitalWrite(latchPin, HIGH);
}

void readButtons() {
  valBtnHomeScore = digitalRead(btnHomeScore);
  valBtnAwayScore = digitalRead(btnAwayScore);
}