import java.util.Iterator;
import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;
/**
   A driver that demonstrates the class TelephoneDirectory.
   
   @author Frank M. Carrano
   @author Timothy M. Henry
   @version 5.0
*/
public class Driver
{
   private static final Name INPUT_ERROR = new Name("error", "error");
   private static final Name QUIT = new Name("quit", "quit");

   public static void main(String[] args)
   {
      TelephoneDirectory directory = new TelephoneDirectory();    
      String fileName = "data.txt"; // Or file name could be read

      try
      {
         Scanner data = new Scanner(new File(fileName));
         directory.readFile(data);
      }
      catch (FileNotFoundException e)
      {
         System.out.println("File not found: " + e.getMessage());
      }
      
      Name nextName = getName();    // Get name for search from user
      while (!nextName.equals(QUIT))
      {
         if (nextName.equals(INPUT_ERROR))
            System.out.println("Error in entering name. Try again.");
         else
         {
            String phoneNumber = directory.getPhoneNumber(nextName);
            if (phoneNumber == null)
               System.out.println(nextName + " is not in the directory.");
            else
               System.out.println("The phone number for " + nextName + 
                                  " is " + phoneNumber);
         } // end if

         nextName = getName();
      } // end while

      System.out.println("Bye!");
   } // end main

   // Returns either the name read from user, INPUT_ERROR, or QUIT.
   private static Name getName()
   {
      Name result = null;
      Scanner keyboard = new Scanner(System.in);

      System.out.print("Enter first name and last name, " +
                       "or quit to end: ");
      String line = keyboard.nextLine();

      if (line.trim().toLowerCase().equals("quit"))
         result = QUIT;
      else
      {
         String firstName = null;
         String lastName = null;
         Scanner scan = new Scanner(line);

         if (scan.hasNext())
         {
            firstName = scan.next();
            if (scan.hasNext())
               lastName = scan.next();
            else
               result = INPUT_ERROR;
         }
         else
            result = INPUT_ERROR;
            
         if (result == null)
         {
            // First and last names have been read
            result = new Name(firstName, lastName);
         } // end if
      } // end if

      return result;
   } // end getName
} // end Driver