import java.util.*; //for the LinkedList

/**
 * Class representing a command for a Turtle
 * @author Dawn Finney
 **/
public class TurtleCommand{
  /**The type of the command such as world, moveTo, forward, etc**/
  public String type;
  /**The parameters for the command**/
  public LinkedList<Integer> parameters;
  
  /**
   * Constructor taking in a the type of the command
   * @param type the command type
   **/
  public TurtleCommand(String type){
    this.type = type;
    parameters = new LinkedList<Integer>();
  }
  
  /**
   * Accessor to return type
   * @return the command type
   **/
  public String getType(){
    return type;
  }
  
  /**
   * Accessor to return the LinkedList of parameters
   * @return the LinkedList of parameters
   **/
  public LinkedList<Integer> getParameters(){
    return parameters;
  }
  
  /**
   * Method to return an integer from specific index from the LinkedList of parameters
   * @return an integer from specific index from the LinkedList of parameters
   **/
  public Integer getParameter(int i){
    return parameters.get(i);
  }
  
  /**
   * Method to add to the LinkedList of parameters
   * @param parameter the item to the LinkedList of parameters
   **/
  public void addParameter(int parameter){
    parameters.add(parameter);
  }
  
  /**
   * Method to return a String representation of the command
   * @return a String representation of the command
   **/
  public String toString(){
    //if the parameter list is not empty and the command type is not null
    if (!parameters.isEmpty() && type != null){
      //initize ret to the command type plus a space
      String ret = type + " ";
      //loop through the parameters LinkedList list
      for (int i = 0; i < parameters.size(); i++){
        //append the parameter to the String ret
        ret = ret + parameters.get(i) + " ";
      }
      //return the String representation
      return ret;
    }
    //return null if the parameter list is empty or the command type is null
    return null;
  }
}