/*
 * NOTE: This copyright does *not* cover user programs that use HQ
 * program services by normal system calls through the application
 * program interfaces provided as part of the Hyperic Plug-in Development
 * Kit or the Hyperic Client Development Kit - this is merely considered
 * normal use of the program, and does *not* fall under the heading of
 * "derived work".
 * 
 * Copyright (C) [2004, 2005, 2006], Hyperic, Inc.
 * This file is part of HQ.
 * 
 * HQ is free software; you can redistribute it and/or modify
 * it under the terms version 2 of the GNU General Public License as
 * published by the Free Software Foundation. This program 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 General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA.
 */

package org.hyperic.hq.ui.taglib.display;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.Tag;
import javax.servlet.jsp.tagext.TagSupport;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts2.views.jsp.TagUtils;
import org.hyperic.hq.appdef.shared.AppdefEntityConstants;
import org.hyperic.hq.appdef.shared.AppdefEntityID;
import org.hyperic.hq.appdef.shared.AppdefResourceTypeValue;
import org.hyperic.hq.appdef.shared.AppdefResourceValue;
import org.hyperic.hq.appdef.shared.InvalidAppdefTypeException;
import org.hyperic.hq.ui.util.RequestUtils;

/**
 * This class is a two in one decorator/tag for use within the
 * <code>TableTag</code>; it is a <code>ColumnDecorator</code> tag that returns
 * property values of resources and their dependent objects, handling null
 * values and the like.
 */
public class ResourceDecorator extends ColumnDecorator implements Tag {

	private static Log log = LogFactory.getLog(ResourceDecorator.class
			.getName());

	private String baseKey;
	private Boolean function;
	private AppdefResourceValue resource;
	private Boolean type;
	private PageContext context;
	private Tag parent;
	private boolean resourceTypeIdIsSet = false;
	private boolean resourceIdIsSet = false;
	private Integer resourceId;
	private Integer resourceTypeId;

	private String resourceName;

	public ResourceDecorator() {
		super();
	}

	public String getBaseKey() {
		return baseKey != null ? baseKey : "";
	}

	public void setBaseKey(String s) {
		baseKey = s;
	}

	public Boolean getFunction() {
		return function;
	}

	public void setFunction(Boolean s) {
		function = s;
	}

	public AppdefResourceValue getResource() {
		return resource;
	}

	public void setResource(AppdefResourceValue s) {
		resource = s;
	}

	public Boolean getType() {
		return type;
	}

	public void setType(Boolean s) {
		type = s;
	}

	public String decorate(Object obj) throws JspException {
		if (resourceTypeIdIsSet && resourceIdIsSet) {
			try {
				Integer id = getResourceId();
				Integer typeId = getResourceTypeId();
				String resourceName = getResourceName();
				String resourceTypeName = AppdefEntityConstants.typeToString(typeId.intValue()).toLowerCase();
				HttpServletRequest req = (HttpServletRequest) context.getRequest();
	
				// resource/server/Inventory.do?mode=view&rid=${resource.resourceId}&type=${resource.resourceTypeId}
				return "<a href=\"" + req.getContextPath() + "/resource/"
						+ resourceTypeName + "/Inventory.do?mode=view&rid=" + id
						+ "&type=" + typeId + " \" />" + resourceName + "</a>";
			} catch(NullPointerException npe) {
				log.debug(npe);
			}
			
			return "";
		}

		try {
			AppdefResourceValue resource = getResource();
			Boolean doFunction = getFunction();
			
			if (Boolean.TRUE.equals(doFunction)) {
				return doFunction(resource);
			}

			Boolean doType = getType();
			
			if (Boolean.TRUE.equals(doType)) {
				return doType(resource);
			}
		} catch (NullPointerException npe) {
			log.debug(npe);
		}
		
		return "";
	}

	private String doFunction(AppdefResourceValue resource) {
		// XXX: groups currently don't have entity ids. when they get
		// them, we'll be able to return a function for them.
		AppdefEntityID entityId = resource.getEntityId();
		
		if (entityId == null) {
			return "";
		}

		String typeName = entityId.getTypeName();
		String key = getBaseKey() + '.' + typeName;
		
		
		// String msg = TagUtils.getInstance().message(context, bundle, locale, key);
		String msg = RequestUtils.message(key);
		
		return msg != null ? msg : typeName;
		
	}

	private String doType(AppdefResourceValue resource) {
		try {
			// XXX: groups currently don't have resource types. when they
			// get them, we'll be able to return a type for them.
			AppdefResourceTypeValue resourceType = resource.getAppdefResourceTypeValue();
			
			return resourceType != null ? resourceType.getName() : "";
		} catch (InvalidAppdefTypeException e) {
			log.debug("can't get resource type for resource [" + resource.getName() + "]: ", e);
			
			return "";
		}
	}

	public int doStartTag() throws JspTagException {
		ColumnTag ancestorTag = (ColumnTag) TagSupport.findAncestorWithClass(this, ColumnTag.class);
		
		if (ancestorTag == null) {
			throw new JspTagException("A ResourceDecorator must be used within a ColumnTag.");
		}
		
		ancestorTag.setDecorator(this);
		
		return SKIP_BODY;
	}

	public int doEndTag() {
		return EVAL_PAGE;
	}

	public Tag getParent() {
		return parent;
	}

	public void setParent(Tag t) {
		this.parent = t;
	}

	public void setPageContext(PageContext pc) {
		this.context = pc;
	}

	public void release() {
		parent = null;
		context = null;
		function = null;
		resource = null;
		type = null;
		baseKey = null;
		parent = null;
	}

	public Integer getResourceId() {
		return this.resourceId;
	}

	public void setResourceId(Integer resourceId) {
		resourceIdIsSet = true;
		this.resourceId = resourceId;
	}

	public Integer getResourceTypeId() {
		return this.resourceTypeId;
	}

	public void setResourceTypeId(Integer resourceTypeId) {
		resourceTypeIdIsSet = true;
		this.resourceTypeId = resourceTypeId;
	}

	public String getResourceName() {
		return this.resourceName;
	}

	public void setResourceName(String resourceName) {
		this.resourceName = resourceName;
	}
}