/*******************************************************************************
 * Copyright (c) 2008, Original authors.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Angelo ZERR <angelo.zerr@gmail.com>
 *******************************************************************************/
package org.akrogen.tkui.css.swing.dom;

import java.awt.Component;
import java.awt.Container;
import java.io.StringReader;
import java.io.StringWriter;

import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.JToolTip;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.akrogen.tkui.css.core.dom.ElementAdapter;
import org.akrogen.tkui.css.core.engine.CSSEngine;
import org.akrogen.tkui.css.core.utils.ClassUtils;
import org.apache.commons.beanutils.PropertyUtils;
import org.apache.xml.serialize.OutputFormat;
import org.apache.xml.serialize.XMLSerializer;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;

/**
 * w3c Element which wrap Swing component.
 * 
 * @version 1.0.0
 * @author <a href="mailto:angelo.zerr@gmail.com">Angelo ZERR</a>
 * 
 */
public class SwingElement extends ElementAdapter implements NodeList {

	private String defaultHTMLContent = null;

	private Document document;

	protected String localName;

	protected String namespaceURI;

	public SwingElement(Component component, CSSEngine engine) {
		super(component, engine);
		this.localName = computeLocalName();
		this.namespaceURI = computeNamespaceURI();
		storeDefaultHTMLContentIfNeeded(component);
	}

	protected String computeLocalName() {
		// The localName is simple class name
		// of the Swing component. For instance
		// for the javax.swing.JLabel
		// localName is JLabel
		// CSS selector will use this localName
		// ex : JLabel {background-color:red;}
		Component component = getComponent();
		Class clazz = component.getClass();
		return ClassUtils.getSimpleName(clazz);
	}

	protected String computeNamespaceURI() {
		// The NamespaceURI is package name
		// of the Swing component. For instance
		// for the javax.swing.JLabel
		// namespaceURI is javax.swing
		// CSS selector will use this localName
		// @namespace swing javax.swing
		// ex : swing|JLabel {background-color:red;}
		Component component = getComponent();
		Class clazz = component.getClass();
		return ClassUtils.getPackageName(clazz);
	}

	public String getAttribute(String attr) {
		Component component = getComponent();
		if (component instanceof JComponent) {
			JComponent c = (JComponent) component;
			Object o = c.getClientProperty(attr.toLowerCase());
			if (o != null)
				return o.toString();
		}
		try {
			Object o = PropertyUtils.getProperty(component, attr);
			if (o != null)
				return o.toString();
		} catch (Exception e) {
			// e.printStackTrace();
		}
		return "";
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.akrogen.tkui.core.css.dom.ElementAdapter#getLocalName()
	 */
	public String getLocalName() {
		return localName;
	}

	public String getNamespaceURI() {
		return namespaceURI;
	}

	public Node getParentNode() {
		Component component = getComponent();
		Container parent = component.getParent();
		if (component instanceof JToolTip) {
			// Component is JToolTip, parent is Component
			parent = ((JToolTip)component).getComponent();
		}		
		if (parent != null) {
			Element element = getElement(parent);
			return element;
		}
		return null;
	}

	public NodeList getChildNodes() {
		if (defaultHTMLContent != null) {
			// load the HTML Content into DOM
			try {
				// Load XML into DOM
				DocumentBuilderFactory factory = DocumentBuilderFactory
						.newInstance();
				DocumentBuilder builder = factory.newDocumentBuilder();
				this.document = builder.parse(new InputSource(new StringReader(
						defaultHTMLContent)));
				return document.getDocumentElement().getChildNodes();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		return this;
	}

	public int getLength() {
		Component component = getComponent();
		if (component instanceof Container)
			return ((Container) component).getComponentCount();
		return 0;
	}

	public Node item(int index) {
		Component component = getComponent();
		if (component instanceof Container) {
			Component c = ((Container) component).getComponent(index);
			return getElement(c);
		}
		return null;
	}

	protected Component getComponent() {
		return (Component) getNativeWidget();
	}

	protected JComponent getJComponent() {
		if (getNativeWidget() instanceof JComponent)
			return (JComponent) getNativeWidget();
		return null;
	}

	public String getCSSId() {
		Component component = getComponent();
		if (component instanceof JComponent) {
			Object id = ((JComponent) component).getClientProperty("id");
			if (id != null)
				return id.toString();
		}
		return component.getName();
	}

	public String getCSSClass() {
		Component component = getComponent();
		if (component instanceof JComponent) {
			Object id = ((JComponent) component).getClientProperty("class");
			if (id != null)
				return id.toString();
		}
		return null;
	}

	public String getCSSStyle() {
		Component component = getComponent();
		if (component instanceof JComponent) {
			Object style = ((JComponent) component).getClientProperty("style");
			if (style != null)
				return style.toString();
		}
		return null;
	}

	public boolean isPseudoInstanceOf(String s) {
		if ("disabled".equals(s)) {
			Component component = getComponent();
			return !component.isEnabled();
		}
		if ("focus".equals(s)) {
			Component component = getComponent();
			return component.hasFocus();
		}
		if ("hover".equals(s)) {
			JComponent component = getJComponent();
			if (component == null)
				return false;
			return (component.getClientProperty("mouseMoved") != null);
		}
		return false;
	}

	public void onStylesApplied(NodeList nodes) {
		if (defaultHTMLContent != null && getNativeWidget() instanceof JLabel) {
			JLabel label = (JLabel) getNativeWidget();
			Element root = (Element) nodes.item(0).getParentNode();
			String htmlContent = getHTMLContent(root);
			if (htmlContent != null)
				label.setText(htmlContent);
		}
		super.onStylesApplied(nodes);
	}

	protected void storeDefaultHTMLContentIfNeeded(Component component) {
		if (!(component instanceof JLabel))
			return;
		JLabel label = (JLabel) component;
		String text = label.getText();
		if (text.startsWith("<html>") && text.endsWith("</html>")) {
			this.defaultHTMLContent = text;
		}
	}

	protected String getHTMLContent(Element element) {
		StringWriter writer = new StringWriter();
		OutputFormat outputFormat = new OutputFormat();
		outputFormat.setOmitXMLDeclaration(true);
		XMLSerializer serializer = new XMLSerializer(writer, outputFormat);
		try {
			serializer.serialize(element);
			return writer.toString();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

}