unsigned char ReadMulti[10] = {0XAA, 0X00, 0X27, 0X00, 0X03, 0X22, 0XFF, 0XFF, 0X4A, 0XDD};
unsigned int  timeSec       = 0;
unsigned int  timemin       = 0;
unsigned int  dataAdd       = 0;
unsigned int  incomedate    = 0;
unsigned int  parState      = 0;
unsigned int  codeState     = 0;

unsigned long currentTime = 0;
unsigned long time_To_Wait_For_Removal = 15; // time in seconds
String Last_EPC_Number = "";




// Define the maximum number of EPC numbers that can be stored
const int MAX_EPC_NUMBERS = 10;

// Create a struct to store the EPC number and its counter
struct EPCData {
  String epcNumber;
  int counter;
  unsigned long lastUpdateTime;
};

// Create an array to store the identified EPC numbers and their respective counters
EPCData identifiedEPC[MAX_EPC_NUMBERS];
int numIdentifiedEPC = 0;  // Variable to keep track of the number of identified EPC numbers

// Function to search for an EPC number in the identifiedEPC array
bool searchEPC(const String& epcNumber) {
  for (int i = 0; i < numIdentifiedEPC; i++) {
    if (identifiedEPC[i].epcNumber == epcNumber) {
      return true;  // Found the EPC number in the array
    }
  }
  return false;  // EPC number not found in the array
}




void setup() {
  //pinMode(LED_BUILTIN, OUTPUT);
  Serial.begin(115200);
  Serial2.begin(115200);
  Serial.println("Hello world.");
  Serial2.write(ReadMulti, 10);
}

void loop() {
  read_RFID_Tags_R200_Long_Range();
}//end of LOOP


void Send_Data_To_Firebase(String EPC_Number_string, int identified_EPC_counter_int){

}

void handel_EPC_Tag() {
  // Check if the new EPC number is already present in the identifiedEPC array
  if (searchEPC(Last_EPC_Number)) {
    // If the EPC number is found, check if 15 seconds have passed since the last update
    currentTime = millis();
    for (int i = 0; i < numIdentifiedEPC; i++) {
      if (identifiedEPC[i].epcNumber == Last_EPC_Number &&
          currentTime - identifiedEPC[i].lastUpdateTime >= (time_To_Wait_For_Removal * 1000)) {
        // Increment the counter and update the last update time
        identifiedEPC[i].counter = (identifiedEPC[i].counter + 1) % 8;  // Increment and wrap around to 0 when reaching 8
        identifiedEPC[i].lastUpdateTime = currentTime;

        // Output a Serial message indicating the updated counter
        Serial.print("EPC number: ");
        Serial.print(Last_EPC_Number);
        Serial.print(", Counter: ");
        Serial.println(identifiedEPC[i].counter);
        Send_Data_To_Firebase(Last_EPC_Number, identifiedEPC[i].counter);
        break;  // Exit the loop once the EPC number is found and updated
      }
    }
  } else {
    // If the EPC number is not found, add it to the identifiedEPC array with an initial counter value of 1
    if (numIdentifiedEPC < MAX_EPC_NUMBERS) {
      identifiedEPC[numIdentifiedEPC].epcNumber = Last_EPC_Number;
      identifiedEPC[numIdentifiedEPC].counter = 0;
      identifiedEPC[numIdentifiedEPC].lastUpdateTime = millis();
      numIdentifiedEPC++;

      // Output a Serial message indicating the new EPC number and counter
      Serial.print("New EPC number identified: ");
      Serial.print(Last_EPC_Number);
      Serial.print(", Counter: ");
      Serial.println(identifiedEPC[numIdentifiedEPC - 1].counter);
      Send_Data_To_Firebase(Last_EPC_Number, identifiedEPC[numIdentifiedEPC - 1].counter);
    } else {
      // Maximum number of EPC numbers reached, handle accordingly
    }
  }
}




void read_RFID_Tags_R200_Long_Range() {
  timeSec ++ ;
  if (timeSec >= 50000) {
    timemin ++;
    timeSec = 0;
    if (timemin >= 20) {
      timemin = 0;
      //digitalWrite(LED_BUILTIN, HIGH);
      Serial2.write(ReadMulti, 10);
      //digitalWrite(LED_BUILTIN, LOW);
    }
  }
  if (Serial2.available() > 0) {
    incomedate = Serial2.read();
    if ((incomedate == 0x02) & (parState == 0)) {
      parState = 1;
    }
    else if ((parState == 1) & (incomedate == 0x22) & (codeState == 0)) {
      codeState = 1;
      dataAdd = 3;
    }
    else if (codeState == 1) {
      dataAdd ++;
      if (dataAdd == 6) {
        //Serial.print("RSSI:");
        //Serial.println(incomedate, HEX);
      }
      else if ((dataAdd == 7) | (dataAdd == 8)) {
        if (dataAdd == 7) {
          //Serial.print("PC:");
          //Serial.print(incomedate, HEX);
        }
        else {
          //Serial.println(incomedate, HEX);
        }
      }
      else if ((dataAdd >= 9) & (dataAdd <= 20)) {
        if (dataAdd == 9) {
          //Serial.print("EPC:");
        }
        //Serial.print(incomedate, HEX);
        Last_EPC_Number += String(incomedate, HEX);
        Last_EPC_Number.toUpperCase();

      }

      else if (dataAdd >= 21) {
        //Serial.println(" ");
        //Serial.print("Saved:");;
        //Serial.println(Last_EPC_Number);
        handel_EPC_Tag();
        Last_EPC_Number = "";
        dataAdd = 0;
        parState = 0;
        codeState = 0;
      }
    }
    else {
      dataAdd = 0;
      parState = 0;
      codeState = 0;
    }
  }
}