#include <IRremote.h>
#include <LiquidCrystal.h>

#define PIN_RECEIVER 2 // Signal Pin of IR receiver

IRrecv receiver(PIN_RECEIVER);

LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

int firstNumber = 0;
int secondNumber = 0;
int result = 0;

void setup()
{
  lcd.begin(16, 2);
  lcd.print("<press a button>");
  receiver.enableIRIn(); // Start the receiver
}

void loop()
{
  // Checks received an IR signal
  if (receiver.decode()) {
    translateIR();
    receiver.resume(); // Receive the next value
  }
}

void lcdPrint(char* text)
{
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("button pressed:");
  lcd.setCursor(0, 1);
  lcd.print(text);
  lcd.print(" code: ");
  lcd.print(receiver.decodedIRData.command);
}

void translateIR()
{
  // Takes command based on IR code received
  switch (receiver.decodedIRData.command) {
    case 162: 
      lcdPrint("POWER");
      break;
    case 226: 
      lcdPrint("MENU");
      break;
    case 34:
      lcdPrint("TEST");
      result = firstNumber + secondNumber;

      lcd.clear();
      lcd.setCursor(3, 0);
      lcd.print("A:");
      lcd.print(firstNumber);
      lcd.setCursor(9, 0);
      lcd.print("B:");
      lcd.print(secondNumber);
      lcd.setCursor(0, 1);
      lcd.print(" Total A + B = ");
      lcd.print(result);
      firstNumber = 0;
      secondNumber = 0;
      result = 0;
      
      break;
    case 2:
      lcdPrint(" + ");
      break;
    case 194: 
      lcdPrint("BACK");
      break;
    case 224: 
      lcdPrint("PREV.");
      break;
    case 168: 
      lcdPrint("PLAY");
      break;
    case 144: 
      lcdPrint("NEXT");
      break;
    case 104: 
      lcdPrint("num: 0");
      addNumber(0);
      break;
    case 152: 
      lcdPrint("MINUS");
      break;
    case 176: 
      lcdPrint("key: C");
      break;
    case 48: 
      lcdPrint("num: 1");
      addNumber(1);
      break;
    case 24:
      lcdPrint("num: 2");
      addNumber(2);
      break;
    case 122:
      lcdPrint("num: 3");
      addNumber(3);
      break;
    case 16:
      lcdPrint("num: 4");
      addNumber(4);
      break;
    case 56:
      lcdPrint("num: 5");
      addNumber(5);
      break;
    case 90:
      lcdPrint("num: 6");
      addNumber(6);
      break;
    case 66:
      lcdPrint("num: 7");
      addNumber(7);
      break;
    case 74:
      lcdPrint("num: 8");
      addNumber(8);
      break;
    case 82:
      lcdPrint("num: 9");
      addNumber(9);
      break;
    default: 
      lcd.clear();
      lcd.print(receiver.decodedIRData.command);
      lcd.print(" other button");
  }
}

void addNumber(int number)
{
  if (firstNumber == 0) {
    firstNumber = number;
  } else if (secondNumber == 0) {
    secondNumber = number;
  }
}