/*
 Wotonomy: OpenStep design patterns for pure Java applications.
 Copyright (C) 2000 Blacksmith, Inc.

 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.

 This library is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, see http://www.gnu.org
 */

package net.wotonomy.web;

import java.util.Iterator;
import java.util.Map;

import net.wotonomy.foundation.NSArray;
import net.wotonomy.foundation.NSDictionary;

/**
 * WOHyperlink renders a dynamically generated hyperlink in the output. Bindings
 * are:
 * <ul>
 * <li>string: a string to be included between the hyperlink tags
 * (optional).</li>
 * <li>escapeHTML: a property returning a value convertable to a Boolean
 * indicating whether the any html characters in the output should be escaped so
 * they are shown as html characters rather than interpreted as html.</li>
 * <li>href: The URL that the hyperlink should point to.</li>
 * <li>pageName: The name of the WOComponent that the hyperlink should point
 * to.</li>
 * <li>directActionName: The name of the direct action to call when the link is
 * activated.</li>
 * <li>actionClass: The name of the WODirectAction subclass where the direct
 * action resides.</li>
 * <li>anchorName: The name of the link, for anchor tags.</li>
 * <li>action: A pointer to a method on the component that contains this
 * element. If the link is activated, the method will be called.
 * <li>ref: The name of the anchor to go to inside the resulting page.</li>
 * </ul>
 *
 * The href, pageName and directActionName/actionClass and name properties are
 * mutually exclusive and you should only use at most one of them
 * simultaneously.
 *
 * @author ezamudio@nasoft.com
 * @author $Author: cgruber $
 * @version $Revision: 905 $
 */
public class WOHyperlink extends WODynamicElement {
	private static final long serialVersionUID = -7615256188185925861L;

	protected String string;
	protected String href;
	protected String pageName;
	protected String directActionName;
	protected String actionClass;
	protected String action;
	protected boolean escapeHTML;
	protected String anchorName;
	protected String ref;

	protected WOHyperlink() {
		super();
	}

	public WOHyperlink(String aName, NSDictionary aMap, WOElement aRootElement) {
		super(aName, aMap, aRootElement);
		escapeHTML = true;
	}

	public void setString(String value) {
		string = value;
	}

	public String string() {
		return string;
	}

	public void setHref(String value) {
		href = value;
	}

	public String href() {
		return href;
	}

	public void setAnchorName(String value) {
		anchorName = value;
	}

	public String anchorName() {
		return anchorName;
	}

	public void setPageName(String value) {
		pageName = value;
	}

	public String pageName() {
		return pageName;
	}

	public void setDirectActionName(String value) {
		directActionName = value;
	}

	public String directActionName() {
		return directActionName;
	}

	public void setActionClass(String value) {
		actionClass = value;
	}

	public String actionClass() {
		return actionClass;
	}

	/** Sets the escapeHTML property. */
	public void setEscapeHTML(boolean escape) {
		escapeHTML = escape;
	}

	/**
	 * If true, inserts escape codes in to the <B>string</B> string so that HTML
	 * special characters (greater-than, less-than, etc.) appear correctly. If
	 * false, those characters will get interpreted by the browser. Defaults to
	 * true.
	 */
	public boolean escapeHTML() {
		return escapeHTML;
	}

	public String actionURL(WOContext c) {
		// Check if the href property is set
		if (href() != null) {
			return href();
		} else if (pageName() != null || associations.objectForKey("action") != null) { // write this component's URL
			StringBuffer retval = new StringBuffer(c.componentActionURL());
			Map addFields = urlFields(c.component());
			if (addFields.size() > 0) {
				Iterator enumeration = addFields.keySet().iterator();
				retval.append('?');
				while (enumeration.hasNext()) {
					String encoding = c.response() != null ? c.response().contentEncoding()
							: c.request().contentEncoding();
					String key = (String) enumeration.next();
					try {
						retval.append(java.net.URLEncoder.encode(key, encoding));
					} catch (java.io.UnsupportedEncodingException ex) {
						retval.append(key);
					}
					retval.append("=");
					try {
						retval.append(java.net.URLEncoder.encode(addFields.get(key).toString(), encoding));
					} catch (java.io.UnsupportedEncodingException e) {
						retval.append(addFields.get(key).toString());
					}
					if (enumeration.hasNext())
						retval.append('&');
				}
			}
			return retval.toString();
		} else if (directActionName() != null) { // compose the direct action URL
			String fullActionName = null;
			if (actionClass() != null)
				fullActionName = actionClass() + "/" + directActionName();
			else
				fullActionName = directActionName();
			return c.directActionURLForActionNamed(fullActionName, urlFields(c.component()));
		}
		return null;
	}

	protected void pullValuesFromParent(WOComponent c) {
		string = stringForProperty("string", c);
		href = stringForProperty("href", c);
		pageName = stringForProperty("pageName", c);
		directActionName = stringForProperty("directActionName", c);
		actionClass = stringForProperty("actionClass", c);
		// action = stringForProperty("action", c);
		escapeHTML = booleanForProperty("escapeHTML", c);
		anchorName = stringForProperty("anchorName", c);
		ref = stringForProperty("ref", c);
	}

	public void appendToResponse(WOResponse r, WOContext c) {
		pullValuesFromParent(c.component());
		r.appendContentString("<A");
		boolean closeQuotes = false;
		// Check if the href property is set
		String _href = actionURL(c);
		if (_href != null) {
			closeQuotes = true;
			r.appendContentString(" HREF=\"");
			r.appendContentString(_href);
		} else if (anchorName() != null) {
			r.appendContentString(" NAME=\"");
			r.appendContentString(anchorName());
			closeQuotes = true;
		}
		if (ref != null) {
			if (!closeQuotes) {
				r.appendContentString(" HREF=\"#");
				closeQuotes = true;
			} else
				r.appendContentString("#");
			r.appendContentString(ref);
		}
		if (closeQuotes)
			r.appendContentString("\"");
		r.appendContentString(additionalHTMLProperties(c.component(), new NSArray(new Object[] { "name", "href",
				"pageName", "action", "directActionName", "actionClass", "anchorName", "escapeHTML", "string" })));
		r.appendContentString(">");
		// Append the string if present
		if (string() != null) {
			if (escapeHTML())
				r.appendContentHTMLString(string());
			else
				r.appendContentString(string());
		}
		// If there is a template, call appendToResponse on it
		if (rootElement != null) {
			rootElement.appendToResponse(r, c);
		}
		// Close the tag
		r.appendContentString("</A>");
	}

	public WOActionResults invokeAction(WORequest r, WOContext c) {
		System.out.println("invoke action with elementID=" + c.elementID() + " senderID=" + c.senderID());
		// Check if this element is the target
		if (c.senderID().equals(c.elementID())) {
			if (pageName() != null) {
				return WOApplication.application().pageWithName(pageName(), r);
			} else {
				WOAssociation ass = (WOAssociation) associations.objectForKey("action");
				if (ass != null && ass.path != null) // ??
					return (WOActionResults) c.component().performAction(ass.path);
			}
		}
		return null;
	}

	public void takeValuesFromRequest(WORequest r, WOContext c) {
		System.out.println("takeValuesFromRequest elementID=" + c.elementID() + " senderID=" + c.senderID());
		super.takeValuesFromRequest(r, c);
	}

}