#include <IRremote.h>

const int IR_RECEIVE_PIN = 2;  // Define the pin number for the IR Sensor
String lastDecodedValue = "";  // Variable to store the last decoded value
const int LED_PINS[] = {3, 4, 5, 6};

void setup() {
  Serial.begin(9600);                                     // Start serial communication at 9600 baud rate
  IrReceiver.begin(IR_RECEIVE_PIN, ENABLE_LED_FEEDBACK);  // Start the IR receiver

  for (int i = 0; i < sizeof(LED_PINS) / sizeof(LED_PINS[0]); i++) {
    pinMode(LED_PINS[i], OUTPUT);
  }
}

void loop() {
  if (IrReceiver.decode()) {
    String decodedValue = decodeKeyValue(IrReceiver.decodedIRData.command);
    // Serial.println(IrReceiver.decodedIRData.command, HEX);
    if (decodedValue != "ERROR" && decodedValue != lastDecodedValue) {
      Serial.println(decodedValue);
      lastDecodedValue = decodedValue;  // Update the last decoded value

      for (int i = 0; i < sizeof(LED_PINS) / sizeof(LED_PINS[0]); i++) {
        digitalWrite(LED_PINS[i], LOW);
      }
      if (decodedValue == "1" || decodedValue == "2" || decodedValue == "3" || decodedValue == "4") {
        int index = decodedValue.toInt() - 1;
        Serial.println((index));
        digitalWrite(LED_PINS[index], HIGH);
      }
    }
    IrReceiver.resume();  // Enable receiving of the next value
  }
}


String decodeKeyValue(long result)
{
  switch(result){
    case 0x68:
      return "0";
    case 0x30:
      return "1"; 
    case 0x18:
      return "2"; 
    case 0x7A:
      return "3"; 
    case 0x10:
      return "4"; 
    case 0x38:
      return "5"; 
    case 0x5A:
      return "6"; 
    case 0x42:
      return "7"; 
    case 0x4A:
      return "8"; 
    case 0x52:
      return "9"; 
    case 0x2:
      return "+"; 
    case 0x98:
      return "-"; 
    // case 0x7:
    //   return "EQ"; 
    // case 0xD:
    //   return "U/SD";
    // case 0x19:
    //   return "CYCLE";         
    case 0xA8:
      return "PLAY/PAUSE";   
    case 0x90:
      return "FORWARD";   
    case 0xE0:
      return "BACKWARD";   
    case 0xA2:
      return "POWER";   
    // case 0x47:
    //   return "MUTE";   
    case 0xE2:
      return "MENU";       
    case 0x0:
      return "ERROR";   
    default :
      return "ERROR";
    }
}