import javax.swing.*;

/**
 * Class to make it easy to get input
 * from a user using JOptionPane
 * @author Barbara Ericson
 * @copyright Georgia Tech
 */
public class SimpleInput
{
  /** 
   * Method to allow the user to input a number.
   * the dialog will keep appearing till a valid
   * number is input.
   * @param message the message to display to 
   * the user in the dialog
   * @return the number as a double
   */
  public static double getNumber(String message)
  {
    boolean okay = true; // start out okay
    String answerString = null; // answer as a string
    double answer = 0;
    
    // Try to get a number using an input dialog
    do
    {
      // get the user's answer as a string
       answerString = JOptionPane.showInputDialog(message);
       
       // try to convert to a number
       try {
         answer = Double.parseDouble(answerString);
         okay = true;
       } catch (Exception ex) {
         /* not a number so set flag to false and
          * change message
          */
         okay = false;
         message = "Try again.  That wasn't a number!";
       }
    } while (!okay);
    
    // return the answer as a number
    return answer;
  }
 
  /** 
   * Method to allow the user to input an integer.
   * The dialog will keep appearing till a valid
   * number is input.
   * @param message the message to display to 
   * the user in the dialog
   * @return the number as an integer
   */
  public static int getIntNumber(String message)
  {
    boolean okay = true; // start out okay
    String answerString = null; // answer as a string
    int answer = 0;
    
    // Try to get a number using an input dialog
    do
    {
      // get the user's answer as a string
       answerString = JOptionPane.showInputDialog(message);
       
       // try to convert to a number
       try {
         answer = Integer.parseInt(answerString);
         okay = true;
       } catch (Exception ex) {
         /* not a number so set flag to false and
          * change message
          */
         okay = false;
         message = "Try again.  That wasn't an integer!";
       }
    } while (!okay);
    
    // return the answer as a number
    return answer;
  }
  
  
  /**
   * Method to get an integer between a minimum
   * and maximum (inclusive)
   * @param message the message to display to 
   * @param min the minimum number
   * @param max the maximum number
   * @return the user entered integer
   */
  public static int getIntNumber(String message,
                                 int min,
                                 int max)
  {
    boolean okay = true; // start out okay
    String answerString = null; // answer as a string
    String failMessage = "Try again.  That wasn't an " +
           "integer between " + min + 
           " and " + max + "!";
    int answer = 0;
    
    // Try to get a number using an input dialog
    do
    {
      // get the user's answer as a string
       answerString = JOptionPane.showInputDialog(message);
       
       // try to convert to a number
       try {
         answer = Integer.parseInt(answerString);
         
         /* check that the answer is in the
          * allowed range
          */
         if (answer >= min && answer <= max)
         {
           okay = true;
         }
         else
         {
           okay = false;
           message = failMessage;
         }
       } catch (Exception ex) {
         /* not a number so set flag to false and
          * change message
          */
         okay = false;
         message = failMessage;
       }
    } while (!okay);
    
    // return the answer as a number
    return answer;
  } 
  
  /**
   * Method to get a string input by the user.
   * The dialog will keep appearing till a 
   * string is entered.
   * @param message the message to display to
   * the user
   * @return the input string
   */
  public static String getString(String message)
  {
    boolean okay = true;
    String answer = null;
    
    do {
      answer = JOptionPane.showInputDialog(message);
      okay = true;
      
      // if null try again
      if (answer == null)
        okay = false;
    } while (!okay);
    
    // return the answer
    return answer;
  }
  
} // end of SimpleInput class