package calculator;

import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import java.io.File;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JTextField;



public class CalcView2 extends JFrame
{
  private static final long serialVersionUID = -8730447125113729547L;
  
  private JMenuBar menuBar;
  private JMenu fileMenu;
  private JMenuItem openItem;
  private JMenuItem saveItem;
  private JTextField userValueText;
  private JTextField calcText;
  private JButton sumButton;
  private JButton subtractButton;
  private JButton multiplyButton;
  private JButton divideButton; 
  private JButton clearButton;
  private final JFileChooser fileDialog;
  
  public CalcView2()
  {
    super("Simple Calculator");
    
    this.menuBar = new JMenuBar();
    this.setJMenuBar(this.menuBar);
    
    this.fileMenu = new JMenu("File");
    this.menuBar.add(this.fileMenu);
    
    this.openItem = new JMenuItem("Open File");
    this.fileMenu.add(this.openItem);
    
    this.saveItem = new JMenuItem("Save File");
    this.fileMenu.add(this.saveItem);
    
    this.userValueText = new JTextField(5);
    
    this.calcText = new JTextField(20);
    this.calcText.setText("0");
    this.calcText.setEditable(false);
    
    this.sumButton = new JButton("Add");
    
    this.subtractButton = new JButton("Subtract");
    
    this.multiplyButton = new JButton("Multiply");
    
    this.divideButton = new JButton("Divide");
    
    this.clearButton = new JButton("Clear");
    
    this.fileDialog = new JFileChooser();
    
    this.setLayout(new FlowLayout());
    this.add(new JLabel("Calculated Value"));
    this.add(this.calcText);
    this.add(new JLabel("Input"));
    this.add(this.userValueText);
    this.add(this.sumButton);
    this.add(this.subtractButton);
    this.add(this.multiplyButton);
    this.add(this.divideButton);
    this.add(this.clearButton);
    this.pack();
    
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  }
  
  /**
   * Get the string value of the user input text field.
   * 
   * @return The string in the user input text field.
   */
  public String getUserValue()
  {
    return this.userValueText.getText();
  }
  
  /**
   * Set the string for the user input text field.
   * 
   * @param value The new value for the user input text field.
   * @pre. value is not null
   */
  public void setUserValue(String value)
  {
    this.userValueText.setText(value);
  }
  
  /**
   * Set the string for the calculated value text field.
   * 
   * @param value The new value for the calculated value text field.
   * @pre. value is not null
   */
  public void setCalcValue(String value)
  {
    this.calcText.setText(value);
  }
  
  
  /**
   * Shows a file chooser for the user to select the file to open.
   *  
   * @return The file chosen by the user, or null if no file was chosen.
   */
  public File getOpenFile()
  {
    int returnVal = this.fileDialog.showOpenDialog(this);
    if(returnVal == JFileChooser.APPROVE_OPTION) 
    {
      return this.fileDialog.getSelectedFile();
    }
    return null;
  }
  
  /**
   * Shows a file chooser for the user to select the file to save.
   *  
   * @return The file chosen by the user, or null if no file was chosen.
   */
  public File getSaveFile()
  {
    int returnVal = this.fileDialog.showSaveDialog(this);
    if(returnVal == JFileChooser.APPROVE_OPTION) 
    {
      return this.fileDialog.getSelectedFile();
    }
    return null;
  }
  
  
  /**
   * Add a listener for the sum button.
   * 
   * @param t the action listener
   */
  public void addSumListener(ActionListener t) {
    this.sumButton.addActionListener(t);
  }

  /**
   * Add a listener for the subtract button.
   * 
   * @param t the action listener
   */
  public void addSubtractListener(ActionListener t) {
    this.subtractButton.addActionListener(t);
  }
  
  /**
   * Add a listener for the multiply button.
   * 
   * @param t the action listener
   */
  public void addMultiplyListener(ActionListener t) {
    this.multiplyButton.addActionListener(t);
  }
  
  /**
   * Add a listener for the divide button.
   * 
   * @param t the action listener
   */
  public void addDivideListener(ActionListener t) {
    this.divideButton.addActionListener(t);
  }
  
  /**
   * Add a listener for the clear button.
   * 
   * @param t the action listener
   */
  public void addClearListener(ActionListener t) {
    this.clearButton.addActionListener(t);
  }
  
  /**
   * Add a listener for the open menu item.
   * 
   * @param t the action listener
   */
  public void addOpenListener(ActionListener t) {
    this.openItem.addActionListener(t);
  }
  
  /**
   * Add a listener for the save menu item.
   * 
   * @param t the action listener
   */
  public void addSaveListener(ActionListener t) {
    this.saveItem.addActionListener(t);
  }
}