//by Nissanka MD SLCOTM
String incom_Msg;


String Category; // first code or segment of msg
String Number_str; // second code or segment of msg
String Action; // Third code or segment of msg
String Board_No;// Fourth code or segment of msg

int No_Of_LEDs = 5;

int first_Space_position;
int second_Space_position;
int third_Space_position;
int Number; // Device Number 

bool State; // LED ON OFF State
bool Action_Error = true;  // Valid Action
bool valid_Number = false;  // Valid LED Number

void setup() {
  
  Serial.begin(9600);
  Serial.println("Enter the command");

    for(int i= 2; i< 1 + No_Of_LEDs; i++ )
  {
    pinMode(i, OUTPUT);
    digitalWrite(i, HIGH);
    delay(100);
    digitalWrite(i, LOW);
  }

}

void loop() {
 
 if(Serial.available()>0)
 {
    /*
    delay(50);
    Serial.print("Serial Message Size : ");
    Serial.println(Serial.available());
    */
    incom_Msg = Serial.readString();
    /*
    Serial.print("Incomming Message : ");
    Serial.println(incom_Msg);
    Serial.print("Incomming Message Size : ");
    Serial.println(incom_Msg.length());
    */
    
    /*
    incom_Msg.trim();
    Serial.print("Trimmed Message : ");
    Serial.println(incom_Msg);
    Serial.print("Trimmed Message Size : ");
    Serial.println(incom_Msg.length());
    */

    if(incom_Msg.indexOf("\n") >= 0)
    {
      //Serial.print("Newline Character found at position : ");
      //Serial.println(incom_Msg.indexOf('\n'));
      incom_Msg.replace("\n", " ");
      //Serial.println("Newline Character removed");
    }

    if(incom_Msg.indexOf("\r") >= 0)
    {
      //Serial.print("Carriage return Character found at position : ");
      //Serial.println(incom_Msg.indexOf("\r"));
      incom_Msg.replace("\r", " ");
      //Serial.println("Carriage return Character removed");
    }
      /*
      Serial.print("modified incomming Message (CR and NL removed) : ");
      Serial.println(incom_Msg);
      Serial.print("lenght of modified Message : ");
      Serial.println(incom_Msg.length());
      */

    while (incom_Msg.indexOf("  ") >= 0) // if double spaces present
      {  
      incom_Msg.replace("  ", " "); // double space replaced with single space
      }

    incom_Msg.trim(); // to remove leading space
    /*
    Serial.print("Middle Duplicate Spaces Trimmed Message : ");
    Serial.println(incom_Msg);
    Serial.print("Middle Duplicate Spaces Trimmed Message Size : ");
    Serial.println(incom_Msg.length());
    */

    incom_Msg.toUpperCase();
    /*
    Serial.print("Message Converted to All Caps : ");
    Serial.println(incom_Msg);
    */

    // Seperate the Codes
    first_Space_position = incom_Msg.indexOf(" ");
    second_Space_position = incom_Msg.indexOf(" ",first_Space_position + 1);
    //third_Space_position = incom_Msg.indexOf(" ",second_Space_position + 1);

    Category = incom_Msg.substring(0,first_Space_position);
    Number_str = incom_Msg.substring(first_Space_position + 1,second_Space_position);
    Action = incom_Msg.substring(second_Space_position + 1); // incom_Msg.substring(second_Space_position + 1,third_Space_position);
    //Board_No = incom_Msg.substring(third_Space_position);

    Number = Number_str.toInt();

    /*
    Serial.print("Category : ");
    Serial.println(Category);
    Serial.print("Number : ");
    Serial.println(Number);
    Serial.print("Action : ");
    Serial.println(Action);
    //Serial.print("Board_No : ");
    //Serial.println(Board_No);

    Serial.print("Action Size : ");
    Serial.println(Action.length());
    */

    // decide the action
    if(Action == "ON") 
      {
        State = true;
        Action_Error = false;
      }
    else if(Action == "OFF")
            {
              State = false;
              Action_Error = false;
            }
            else Action_Error = true;

    // Implement the Action

    if(Category == "LED")  // Whether the category is valid
      {
         if(Number < 1 || Number > No_Of_LEDs ) valid_Number = false;
         else valid_Number =  true;
         
         if(!Action_Error) // of no error in action
            {
              if(valid_Number)
              {                
               digitalWrite(Number + 1,State); 
               Serial.println("Done !");
              }
              else Serial.println("Invalid LED Number !");
            }
          else Serial.println("Invalid Action !");

      }

    else
      {
          Serial.println("Invalid Category !");
      } 


 }
 

}