package cse1030;

import java.awt.Dimension;
import java.io.File;

import javax.swing.BoxLayout;
import javax.swing.ImageIcon;
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;

/**
 * A view for the image viewer app.
 * 
 * @author CSE1030Z
 *
 */
public class ViewerView extends JFrame {

  private static final long serialVersionUID = 5851493549391433289L;
  private JLabel img;
  private JFileChooser fc;
  
  /**
   * Create a view using the given model.
   * 
   * @param m a model for the image viewer app
   */
  public ViewerView(ViewerModel m) {
    super("Image Viewer");
    
    ViewerController c = new ViewerController(m, this);
    
    img = new JLabel("");
    
    JMenuBar bar = new JMenuBar();
    this.setJMenuBar(bar);
    
    JMenu menu = new JMenu("File");
    bar.add(menu);
    
    JMenuItem open = new JMenuItem("Open");
    open.addActionListener(c);
    open.setActionCommand(ViewerController.OPEN);
    menu.add(open);
    
    JMenuItem clear = new JMenuItem("Clear");
    clear.addActionListener(c);
    clear.setActionCommand(ViewerController.CLEAR);
    menu.add(clear);
    
    fc = new JFileChooser();
    fc.setCurrentDirectory(new File("/cse/dept/www/course_archive/2012-13/W/1030/Z/labs/08/img"));
    fc.setMultiSelectionEnabled(true);
    
    JButton prev = new JButton("Previous");
    prev.addActionListener(c);
    prev.setActionCommand(ViewerController.PREVIOUS);
    
    JButton next = new JButton("Next");
    next.addActionListener(c);
    next.setActionCommand(ViewerController.NEXT);
    
    this.setMinimumSize(new Dimension(500, 500));
    this.setLayout(new BoxLayout(this.getContentPane(), BoxLayout.Y_AXIS));
    this.add(prev);
    this.add(next);
    this.add(img);
    this.pack();
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  }

  /**
   * Gets an array of files to open from a file chooser dialog.
   * The returned array has length zero if the user has not selected
   * any files, or has chosen to cancel the file chooser dialog.
   * 
   * @return an array of files to open
   */
  public File[] getFilesToOpen() {
    File[] files = new File[0];
    int returnVal = fc.showOpenDialog(this);
    if (returnVal == JFileChooser.APPROVE_OPTION) {
      files = fc.getSelectedFiles();
    }
    return files;
  }
  
  /**
   * Sets the image shown by the view to the specified image.
   * 
   * @param icon an image to show in the view
   */
  public void setImage(ImageIcon icon) {
    if (this.img.getIcon() != icon) {
      this.img.setIcon(icon);
      this.pack();
    }
  }
}