package infixView;

import javax.swing.*;  // to use JFrame.
import java.awt.*;
import java.awt.event.*;
import infixModel.*;

/**
 * This is the GUI for the infix calculator model
 * For a graphical calculator use this as the main.
 * 
 */
public class InfixGUI extends AFrame{
  
  private InfixCalc _calc; // the "model"
  private JTextField _display;
  
  /**
   * Note how this inner class accesses the private _calc and _display fields.
   */
  private class DigitListener implements ActionListener {
    private char digit;
    DigitListener(char c) {
      digit = c;
    }
    
    public void actionPerformed(ActionEvent e) {
      _display.setText(_calc.enterDigit(digit));
    }
    
  }
  
  /**
   * Note how this inner class accesses the private _calc and _display fields.
   */
  private class OpListener implements ActionListener {
    private IBinOp op;
    OpListener(IBinOp o) {
      op = o;
    }
    
    public void actionPerformed(ActionEvent e) {
      _display.setText(_calc.enterOp(op));
    }
    
  }
  
  /**
   * Default constructor, uses title of "Cheap Calculator"
   */
  public InfixGUI() {
    super("Cheap Calculator");
  }
  
  /**
   * Initializes the GUI
   */
  protected void initialize() {
    JButton zeroJButton = new JButton("0");
    JButton threeJButton = new JButton("3");
    JButton fourJButton = new JButton("4");
    JButton fiveJButton = new JButton("5");
    JButton sixJButton = new JButton("6");
    JButton sevenJButton = new JButton("7");
    JButton eightJButton = new JButton("8");
    JButton nineJButton = new JButton("9");
    JButton pointJButton = new JButton(".");
    JButton equalsJButton = new JButton("=");
    JButton plusJButton = new JButton("+");
    JButton mulJButton = new JButton("x");
    JButton clearJButton = new JButton("C");
    _calc  = new InfixCalc();
    _display = new JTextField("0", 12);
    
    Container cp = getContentPane();
    cp.setLayout(new FlowLayout());
    cp.add(_display);
    _display.setBackground(Color.white);
    _display.setEnabled(false);
    
    cp.add(zeroJButton);
    zeroJButton.addActionListener(new DigitListener('0'));
    cp.add(threeJButton);
    threeJButton.addActionListener(new DigitListener('3'));
    cp.add(fourJButton);
    fourJButton.addActionListener(new DigitListener('4'));
    cp.add(fiveJButton);
    fiveJButton.addActionListener(new DigitListener('5'));
    cp.add(sixJButton);
    sixJButton.addActionListener(new DigitListener('6'));
    cp.add(sevenJButton);
    sevenJButton.addActionListener(new DigitListener('7'));
    cp.add(eightJButton);
    eightJButton.addActionListener(new DigitListener('8'));
    cp.add(nineJButton);
    nineJButton.addActionListener(new DigitListener('9'));
    
    cp.add(pointJButton);
    pointJButton.addActionListener(new ActionListener (){
      public void actionPerformed(ActionEvent e) {
        _display.setText(_calc.enterPoint());
      }
      
    });
    
    cp.add(plusJButton);
    plusJButton.addActionListener(new OpListener(AddOp.Singleton));
    cp.add(mulJButton);
    mulJButton.addActionListener(new OpListener(MulOp.Singleton));
    
    cp.add(equalsJButton);
    equalsJButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        _display.setText(_calc.enterEqual());
      }
    });
    
    cp.add(clearJButton);
    clearJButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        _display.setText(_calc.clear());
      }
    });
    cp.setBackground(Color.BLUE);
    setSize(400,200);
    setVisible(true);    
  }
  
  /**
   * Main function to start of the program.  No input arguments required.
   * Simply instantiates the GUI.
   */
  public static void main(String [] args) {
    new InfixGUI();
  }
}