/*

  The circuit:
 * LCD RS pin to digital pin 12
 * LCD Enable pin to digital pin 11
 * LCD D4 pin to digital pin 5
 * LCD D5 pin to digital pin 4
 * LCD D6 pin to digital pin 3
 * LCD D7 pin to digital pin 2
 * LCD R/W pin to ground
 * LCD VSS pin to ground
 * LCD VCC pin to 5V
 * 10K resistor:
 * ends to +5V and ground
 * wiper to LCD VO pin (pin 3)


*/

// include the library code:
#include <LiquidCrystal.h>

// initialize the library by associating any needed LCD interface pin
// with the arduino pin number it is connected to
const int rs = 12, en = 11, d4 = 2, d5 = 3, d6 = 4, d7 = 5;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

// button set-ups
const int buttonAPin = 7;
const int buttonBPin = 8;

unsigned long debounceDelay = 100; // how long must there be between two different input

// mutable variables
unsigned long lastReadTimeA = 0; // record when does it reads a difference last time
unsigned long lastReadTimeB = 0; // record for button B
int buttonStateA, buttonStateB;
int lastButtonStateA = LOW, lastButtonStateB = LOW;
int gameStatus = 0; // if 0, game in menu, 1 starts the game
// When gameStatus = 0, 0 -> not ready, 1-> ready
// When gameStatus = 1, 0, 1, 2 -> finished laps
int playerAStatus = 0, playerBStatus = 0;
int win = 0; // check if game ends
int playerAPos = 0, playerBPos = 0; // player position

void setup() {
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  pinMode(buttonAPin, INPUT);
  pinMode(buttonBPin, INPUT);

}
// Reads button and check debounce
void ButtonRead(int buttonStateA, int buttonStateB, int lastReadTimeA, int lastReadTimeB, int lastButtonStateA, int lastButtonStateB){
  int readA = digitalRead(buttonAPin);
  int readB = digitalRead(buttonBPin);

  if(readA != lastButtonStateA)
    lastReadTimeA = millis();
  if(readB != lastButtonStateB)
    lastReadTimeB = millis();
  
  if((millis() - lastReadTimeA) > debounceDelay){
    buttonStateA = readA;
  }
  if((millis() - lastReadTimeB) > debounceDelay){
    buttonStateB = readB;
  }

  lastButtonStateA = readA;
  lastButtonStateB = readB;
}
// Game menu part
void GameMenu(){
  ButtonRead(buttonStateA, buttonStateB, lastReadTimeA, lastReadTimeB, lastButtonStateA, lastButtonStateB);
  
  if(playerAStatus == 0 && buttonStateA == 1)
    playerAStatus = 1;
  if(playerBStatus == 0 && buttonStateB == 1)
    playerBStatus = 1;

  lcd.setCursor(0, 1);
  if(playerAStatus == 0)
    lcd.print("Player 1");
  else lcd.print("1");
  lcd.setCursor(0, 2);
  if(playerBStatus == 0)
    lcd.print("Player 2");
  else lcd.print("2");

  if(playerAStatus == 1 && playerBStatus == 1){
    gameStatus = 1;
    playerAStatus = 0;
    playerBStatus = 0;
  }
}
//Game start
void GameOn(){
  ButtonRead(buttonStateA, buttonStateB, lastReadTimeA, lastReadTimeB, lastButtonStateA, lastButtonStateB);
  //player moving
  if(buttonStateA == 1){
    lcd.setCursor(playerAPos,1);
    lcd.scrollDisplayRight();
    playerAPos ++;
    if(playerAStatus = 1){
      lcd.setCursor(15, 1);
      lcd.print("#");
    }
  }
  if(buttonStateB == 1){
    lcd.setCursor(playerBPos,2);
    lcd.scrollDisplayRight();
    playerBPos ++;
    if(playerBStatus = 1){
      lcd.setCursor(15, 2);
      lcd.print("#");
    }
  }
  //if lap finished
  if(playerAPos == 15){
    playerAStatus ++;
    if(playerAStatus == 2){
      delay(500);
      win = 1;
      return;
    }
    else{
      playerAPos = 0;
      lcd.setCursor(0, 1);
      lcd.print("1");
      lcd.setCursor(15, 1);
      lcd.print("#");
    }
  }
  if(playerBPos == 15){
    playerBStatus ++;
    if(playerBStatus == 2){
      delay(500);
      win = 1;
      return;
    }
    else{
      playerBPos = 0;
      lcd.setCursor(0, 2);
      lcd.print("2");
      lcd.setCursor(15, 2);
      lcd.print("#");
    }
  }
}
//Player win case
void WinCase(){
  delay(500);
  lcd.clear();
  if(playerAStatus == 2){
    lcd.setCursor(0, 1);
    lcd.print("Player 1 wins !!!");
  }
  if(playerBStatus == 2){
    lcd.setCursor(0, 2);
    lcd.print("Player 2 wins !!!");
  }
  delay(2000);
  //reset
  lastReadTimeA = 0; 
  lastReadTimeB = 0;
  buttonStateA = 0;
  buttonStateB = 0;
  lastButtonStateA = LOW;
  lastButtonStateB = LOW;
  gameStatus = 0;
  playerAStatus = 0;
  playerBStatus = 0;
  win = 0;
  playerAPos = 0;
  playerBPos = 0;
}
void loop() {
  if (gameStatus == 0)
    GameMenu();
  else
    GameOn();

  if(win)
    WinCase();
}