// TODO: Put in ui package:
//package ui;
package startLab7;

//import shapes.CompositeShape;
//import shapes.ShapeManager;
//import shapes.Shape;
import javax.swing.*;

import java.awt.*;
import java.awt.event.*;
import java.util.ArrayList;
import java.util.List;
import java.util.Observable;

/**
 * @author hornick
 * ShapeListUI - implements the UI that displays a list of shapes in a collection
 */
public class ShapeListUI extends JFrame /*implements java.util.Observer*/ {

	private JList jlContents;
	private String cmdCombine = "Combine";
	private String cmdDecompose = "Decompose";

	/**
	 * Class constructor: creates the UI
	 */
	public ShapeListUI() {		

		EventHandler eventHandler = new EventHandler();

		//Window
		setTitle("SE2811 Shape List"); // initial title
		setSize(250, 400);
		setLocation(200, 200);
		setResizable(true);
		setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
		setVisible(true);

		Container contentPane = getContentPane();

		BorderLayout bl = new BorderLayout(0,0);
		contentPane.setLayout(bl);
//		contentPane.setBackground(Color.BLACK);

		//Panel that contains the add, cancel, and save buttons
		JPanel jp = new JPanel();
		jp.setLayout(new FlowLayout(FlowLayout.CENTER));
		jp.setBackground(new Color(113, 142, 169));

		//"Add" button
		JButton btnCombine = new JButton(cmdCombine);
		//btnAdd.setBounds(20, 400, 139, 50);
		btnCombine.addActionListener(eventHandler);
		jp.add(btnCombine);

		//"Remove" button
		JButton btnDecompose = new JButton(cmdDecompose);
		//btnAdd.setBounds(20, 400, 139, 50);
		btnDecompose.addActionListener(eventHandler);
		jp.add(btnDecompose);


		contentPane.add(jp, BorderLayout.SOUTH);

		jlContents = new JList(new DefaultListModel() );
//		jlContents.setBackground(Color.BLACK);	
//		jlContents.setForeground(Color.WHITE);	
		Font font = new Font("Arial", Font.PLAIN, 12 );
		jlContents.setFont(font);
		JScrollPane spPLContents = new JScrollPane(jlContents, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);	// CCT lab 6
		spPLContents.setBounds(20, 40, 458, 340);
		contentPane.add(spPLContents, BorderLayout.CENTER);

		//"Contents" label
		JLabel lblContents = new JLabel();
		lblContents.setBounds(20, 20, 458, 20);
		lblContents.setText("Shape contents:");
		contentPane.add(lblContents, BorderLayout.NORTH);

		contentPane.validate();
		contentPane.repaint();	

		//TODO: observe ShapeManager
	}


	//TODO: @Override?
	/**
	 * override of java.util.Observable's update() method.
	 * Regenerates the list of shapes contained in the ShapeManager's collection 
	 */
	public void update(Observable o, Object arg) {
		DefaultListModel list = (DefaultListModel)jlContents.getModel();
		list.clear();
		
		//TODO: complete
	}

	/**
	 * gathers the selected shapes from the list and calls
	 * the appropriate ShapeManager methods to composite the selected shapes 
	 */
	private void handleCombine() {
		Object[] selectedShapes = jlContents.getSelectedValues();
		// TODO: complete
	}
	
	/**
	 * gathers the selected shapes from the list and calls
	 * the appropriate ShapeManager methods to decompose the selected composites;
	 * ignores non-composite selections 
	 */
	private void handleDecompose() {
		Object[] selectedComposites = jlContents.getSelectedValues();
		//TODO: complete
	}
	/**
	 * ShapeHierarchyUI event handler
	 * @author hornick
	 *
	 */
	private class EventHandler implements ActionListener {

		/* (non-Javadoc)
		 * @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
		 */
		public void actionPerformed(ActionEvent event) {
			String cmd = event.getActionCommand();
			if( cmd.equals(cmdCombine))
				handleCombine();
			if( cmd.equals(cmdDecompose))
				handleDecompose();
		}
	}
}