/*
    * Copyright 2005-2008 The Kuali Foundation
    * 
    * 
    * Licensed under the Educational Community License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    * 
    * http://www.opensource.org/licenses/ecl2.php
   * 
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.kuali.rice.kew.edl.components;
  
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  
  import org.kuali.rice.kew.edl.EDLContext;
  import org.kuali.rice.kew.edl.EDLModelComponent;
  import org.kuali.rice.kew.edl.EDLXmlUtils;
  import org.kuali.rice.kew.edl.RequestParser;
  import org.w3c.dom.Document;
  import org.w3c.dom.Element;
  
  
  
  /**
   * Matches request params to fields defined in edl configs.  Places matched value on the dom for rendering.  Places 
   * currentDefinitionElement definition ( the element used to get the param from the request) element on the
   * dom for rendering.
   * 
   * This is the base EDL Config Component for dealing with defined elements in an edl definition.  Most 
   * custom edl element behavior can be achieved by subclassing this.
   * 
   * @author Kuali Rice Team (rice.collab@kuali.org)
   *
   */
  public class SimpleWorkflowEDLConfigComponent implements EDLModelComponent {
  
  	protected Element definitionElement;
  	private EDLContext edlContext;
  
  	public void updateDOM(Document dom, Element currentDefinitionElement, EDLContext edlContext) {
  
  		RequestParser requestParser = edlContext.getRequestParser();
  		this.edlContext = edlContext;
  		
  		
  		this.definitionElement = currentDefinitionElement;
  		Element configElementForDOM = getReplacementConfigElement(currentDefinitionElement);
  		if (configElementForDOM == null) {
  			configElementForDOM = currentDefinitionElement;
  		}
  
  		Element edlContentElement = EDLXmlUtils.getEDLContent(dom, false);
  		edlContentElement.appendChild(configElementForDOM);
  		
  		Element currentVersion = VersioningPreprocessor.findCurrentVersion(dom);
  		
  		List matchingParams = getMatchingParams(configElementForDOM, requestParser, edlContext);
  		for (Iterator iter = matchingParams.iterator(); iter.hasNext();) {
  			MatchingParam matchingParam = (MatchingParam) iter.next();
  			EDLXmlUtils.createFieldDataElement(currentVersion, matchingParam);
  		}
  	}
  	
  	public Element getReplacementConfigElement(Element element) {
  		return null;
  	}
  
  	public List getMatchingParams(Element originalConfigElement, RequestParser requestParser, EDLContext edlContext) {
  		List params = new ArrayList();
  		String paramName = originalConfigElement.getAttribute("name");
  		String[] paramValues = requestParser.getParameterValues(paramName);
  		if (paramValues == null) {
  			return params;
  		}
  		for (int i = 0; i < paramValues.length; i++) {
  			String value = paramValues[i];
  			MatchingParam matchingParam = new MatchingParam();
  			matchingParam.setParamName(paramName);
  			matchingParam.setParamValue(value);
  			String errorMessage = getErrorMessage(originalConfigElement, requestParser, matchingParam);
  			if (errorMessage != null) {
  				matchingParam.setError(Boolean.TRUE);
  				matchingParam.setErrorMessage(errorMessage);
  				edlContext.setInError(true);
  			}
  			params.add(matchingParam);
  		}
  		return params;
  	}
  
  	public String getErrorMessage(Element originalConfigElement, RequestParser requestParser, MatchingParam matchingParam) {
 		return null;
 	}
 
 	public Element getDefinitionElement() {
 		return definitionElement;
 	}
 
 	public void setDefinitionElement(Element definitionElement) {
 		this.definitionElement = definitionElement;
 	}
 
 	public EDLContext getEdlContext() {
 		return edlContext;
 	}
 
 	public void setEdlContext(EDLContext edlContext) {
 		this.edlContext = edlContext;
 	}
 }