package lettergame.model;
import java.awt.BorderLayout;
import java.awt.Color;
import java.util.*;
import javax.swing.*;
import javax.swing.border.LineBorder;

public class ListView<T> extends Box implements Observer{
	ObservableList<? extends T> model;
	ComponentFactory<? super T> factory;
	WeakHashMap<T,JComponent> views =
		new WeakHashMap<T, JComponent>();
	public ListView(ObservableList<? extends T> model,
			ComponentFactory<? super T> factory) {
		super(BoxLayout.Y_AXIS);
		this.model = model;
		this.factory = factory;
		updateView();
		model.addObserver(this);
	}
	
	void updateView() {
		removeAll();
		for (T listItem : model)
			add(getViewFor(listItem));
		revalidate();
		repaint();
	}

	JComponent getViewFor(T listItem) {
		if (!views.containsKey(listItem))
			views.put(listItem, factory.createView(listItem));
		return views.get(listItem);
	}

	public void update(Observable arg0, Object arg1) {
		updateView();
	}

	// Test program
	public static void main(String[] args) {
		ObservableList<String> model =
			new ObservableList<String>(new LinkedList<String>());
		
		ListView<String> listView =
			new ListView<String>(model, new ComponentFactory<String>() {
			public JComponent createView(String item) {
				return new JLabel(item);
			}
		});
		
		new TestFrame(listView);
		rest(1000);
		model.add("hello");
		rest(1000);
		model.add("there");
		rest(1000);
		model.add("world");
		for (char x = 'a'; (int) x <= (int) 'z'; x++) {
			model.add(""+x);
		}
		rest(1000);
		model.move(0,15);
		model.move(28,27);
		rest(5000);
		model.move(27,28);
	}
	static void rest(int ms) {
		try {
			Thread.sleep(ms);
		} catch (InterruptedException ie) {
			ie.printStackTrace();
		}
	}
}