package org.webswing.toolkit;

import java.awt.Component;
import java.awt.KeyboardFocusManager;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Window;
import java.awt.peer.KeyboardFocusManagerPeer;

import javax.swing.JPasswordField;
import javax.swing.SwingUtilities;
import javax.swing.event.CaretEvent;
import javax.swing.event.CaretListener;
import javax.swing.text.BadLocationException;
import javax.swing.text.JTextComponent;

import org.webswing.model.appframe.out.FocusEventMsgOut;
import org.webswing.toolkit.api.component.HtmlPanel;
import org.webswing.toolkit.util.Util;

@SuppressWarnings("restriction")
public class WebKeyboardFocusManagerPeer implements KeyboardFocusManagerPeer {

	private static boolean optimizeCaret = Boolean.getBoolean("webswing.optimizeCaret");

	private static CaretListener caretListener = new CaretListener() {
		@Override
		public void caretUpdate(CaretEvent e) {
			Object c = e.getSource();
			Component o = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner();

			if (o != c) {
				// do not send caret update focus event if the current focus owner is not the source of this event
				// without this check a focus event for previous owner is sent when moving focus from  one field to another
				return;
			}
			
			Util.getWebToolkit().getPaintDispatcher().notifyFocusEvent(getFocusEvent());
		}
	};

	@Override
	public void clearGlobalFocusOwner(Window activeWindow) {
	}

	@Override
	public Component getCurrentFocusOwner() {
		Window window = Util.getWebToolkit().getWindowManager().getActiveWindow();
		if(window!=null){
			return window.getFocusOwner();
		}
		return null;
	}

	@Override
	public Window getCurrentFocusedWindow() {
		return Util.getWebToolkit().getWindowManager().getActiveWindow();
	}

	@Override
	public void setCurrentFocusOwner(Component comp) {
		SwingUtilities.invokeLater(new Runnable() {
			@Override
			public void run() {
				Component o = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner();
				if (o instanceof JTextComponent) {
					JTextComponent tc = (JTextComponent) o;
					tc.removeCaretListener(caretListener);
					tc.addCaretListener(caretListener);
				}
				Util.getWebToolkit().getPaintDispatcher().notifyFocusEvent(getFocusEvent());
			}
		});
	}

	private static FocusEventMsgOut getFocusEvent(){
		Component o = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner();
		FocusEventMsgOut msg = new FocusEventMsgOut();
		if (o != null && o.isShowing() && !(o instanceof HtmlPanel)) {
			msg.setType(FocusEventMsgOut.FocusEventType.focusGained);
			Point l = o.getLocationOnScreen();
			msg.setX(l.x);
			msg.setY(l.y);
			Rectangle b = o.getBounds();
			msg.setW(b.width);
			msg.setH(b.height);
			if (o instanceof JTextComponent) {
				JTextComponent tc = (JTextComponent) o;
				if (tc.isEditable() && tc.getWidth() > 0 && tc.getHeight() > 0) {
					if(optimizeCaret && tc.getCaret().getBlinkRate()!=0){
						tc.getCaret().setBlinkRate(0);
					}
					int position = tc.getCaretPosition();
					try {
						Rectangle location = tc.modelToView(position);
						if (location != null) {
						msg.setType(FocusEventMsgOut.FocusEventType.focusWithCarretGained);
							msg.setCaretX(location.x);
							msg.setCaretY(location.y);
							msg.setCaretH(location.height);
							msg.setEditable(tc.isEditable());
						}
					} catch (BadLocationException e) {
						e.printStackTrace();
					}
				}
			}
			if(o instanceof JPasswordField){
				msg.setType(FocusEventMsgOut.FocusEventType.focusPasswordGained);
			}
		} else {
			msg.setType(FocusEventMsgOut.FocusEventType.focusLost);
		}
		return msg;
	}

	@Override
	public void setCurrentFocusedWindow(Window win) {
	}

}