import java.awt.GridLayout;
import javax.swing.JPanel;
import javax.swing.JTextField;
import java.util.Random;

/**
This provides GUI interfaces for Simultaneous
@author Melvin Fitting
@version April, 2003
@version Revised December, 2007
*/

public class SimultaneousGUI implements QuestionGUI
{
   private Simultaneous problem;
   private JTextField xAns, yAns;
   //for the student to enter answers
      
   public SimultaneousGUI(Random r)
   {
      problem = new Simultaneous(r);
   }

   public JPanel askQuestion()
   {
      JPanel p = new JPanel();
      p.setLayout(new GridLayout(5,1));

      JTextField question1, question2, question3;
         //question1 is for the word part of the problem
         //question2 and question3 display the two equations
      Object[] q = problem.getQuestion();
      question1 = new JTextField("Find a simultaneous solution to:");
      question1.setBackground(QUESTION);
      question2 = new JTextField(q[0] + "x + " + q[1] + "y = " + q[2]);
      question2.setBackground(QUESTION);
      question3 = new JTextField(q[3] + "x + " + q[4] + "y = " + q[5]);
      question3.setBackground(QUESTION);
      question1.setEditable(false);
      question2.setEditable(false);
      question3.setEditable(false);

      xAns = new JTextField("x value goes here");
      xAns.setBackground(ANSWER_ENTRY);
      xAns.setEditable(true);
      yAns = new JTextField("y value goes here");
      yAns.setBackground(ANSWER_ENTRY);
      yAns.setEditable(true);
      
      p.add(question1);
      p.add(question2);
      p.add(question3);
      p.add(xAns);
      p.add(yAns);
      return(p);
   }
   
   public void putAnswer()
   {
      String input = xAns.getText().trim();
      double x = Double.parseDouble(input);
      input = yAns.getText().trim();
      double y = Double.parseDouble(input);
      Object[] answer = {new Double(x), new Double(y)};
      problem.putAnswer(answer);
   }      
   
   public JPanel showAnswer()
   {
      JPanel p = new JPanel();

      if (getScore() == 10)
      {
         JTextField result = new JTextField("Answered correctly.");
         result.setBackground(GOOD_ANSWER);
         result.setEditable(false);
         p.add(result);
      }
      else
      {
         Object[] answer = problem.getAnswer();
         JTextField xAnswer = new JTextField("x = " + answer[0]);
         xAnswer.setBackground(BAD_ANSWER);
         xAnswer.setEditable(false);
         JTextField yAnswer = new JTextField("  y = " + answer[1]);
         yAnswer.setBackground(BAD_ANSWER);
         yAnswer.setEditable(false);
         
         p.setLayout(new GridLayout(2,1));
         p.add(xAnswer);
         p.add(yAnswer);
      }
      return(p);
   }

   public int getScore()
   {
      return problem.getScore();
   }
}