import java.io.*;
import java.util.*;
import sllist.Lnode;
import sllist.Llist;
 
public class Lab6 {
	
	public static void main(String[] args) throws IOException {
	   Llist<Integer> mylist = new Llist<Integer>();
	   for (int i=0; i<args.length; i++) {
		   mylist.insert(Integer.parseInt(args[i]));
	   }
	   mylist.display();
	   System.out.println("Enter command:\n");
	   System.out.println(" e  n\tto see if the list is empty");
	   System.out.println(" i  n\tto insert n into the linked list");
	   System.out.println(" r  n\tto remove all instances of n from the linked list");
	   System.out.println(" R\tto remove the first item from the list");
	   System.out.println(" q\tto terminate this program");
	   BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
	   String input, command;
	   int operand, numberFound=0;
	   System.out.print(">>");
	   while ( (input=in.readLine()) != null ) {
	      Scanner s = new Scanner(input);
	      try {
	         if(s.hasNext()) {  // ignore blank input lines
	            command = s.next(); // get next token (expecting "e", "i", "r", "R" or "q")
	            if (command.compareTo("e")==0) {
	               System.out.println("The list is "+(mylist.isEmpty()?"":"not ")+"empty.");
	               mylist.display();
	            }
	            else if (command.compareTo("i")==0) {
	               mylist.insert(s.nextInt());
	               mylist.display();
	            }
	            else if (command.compareTo("r")==0) {
	               numberFound = mylist.remove(s.nextInt());
	               System.out.println(numberFound + " items removed");
	               mylist.display();
	            }
	            else if (command.compareTo("R")==0) {
	               System.out.println("attempt to remove first item "+(mylist.remove()?"succeeded":"failed"));
	               mylist.display();
	            }
	            else if (command.compareTo("q")==0) {
	               mylist.display();	 
	               break;           
	            }
	            else {
	               continue;  // ignore unknown commands
	            }
	         }
          }
          catch(NoSuchElementException e) {
	          // recover if command "r" or "i" entered with no operand
          }
	      System.out.print(">>");
	   }
	   System.out.println("Exiting normally");
		return;
	}
}