/*
    * Copyright 2007 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.kns.web.servlet;
  
  import java.io.InputStream;
  import java.util.ArrayList;
  import java.util.List;
  
  import javax.servlet.ServletConfig;
  import javax.servlet.ServletException;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.core.util.ClassLoaderUtils;
  import org.kuali.rice.kns.service.KNSServiceLocator;
  import org.kuali.rice.kns.service.ModuleService;
  import org.kuali.rice.kns.util.KNSConstants;
  import org.kuali.rice.kns.util.spring.NamedOrderedListBean;
  import org.springframework.core.io.DefaultResourceLoader;
  
  import uk.ltd.getahead.dwr.Configuration;
  import uk.ltd.getahead.dwr.DWRServlet;
  
  public class KualiDWRServlet extends DWRServlet {
  	/**
  	 * 
  	 */
  	private static final long serialVersionUID = -3903455224197903186L;
  
  	private static final String CLASSPATH_RESOURCE_PREFIX = "classpath.resource.prefix";
  	
  	public static List<String> HACK_ADDITIONAL_FILES = new ArrayList<String>();
  
  	private Boolean springBasedConfigPath;
  
  	@Override
  	public void init(ServletConfig config) throws ServletException {
  		setSpringBasedConfigPath(new Boolean(config.getInitParameter("springpath")));
  		super.init(config);
  	}
  
  	/**
  	 * This method calls the super version then loads the dwr config file
  	 * specified in the loaded module definitions.
  	 * 
  	 * @see uk.ltd.getahead.dwr.DWRServlet#configure(javax.servlet.ServletConfig,
  	 *      uk.ltd.getahead.dwr.Configuration)
  	 */
  	@Override
  	public void configure(ServletConfig servletConfig, Configuration configuration) throws ServletException {
  		String classpathResourcePrefix = KNSServiceLocator.getKualiConfigurationService().getPropertyString(CLASSPATH_RESOURCE_PREFIX);
  		for (NamedOrderedListBean namedOrderedListBean : KNSServiceLocator.getNamedOrderedListBeans(KNSConstants.SCRIPT_CONFIGURATION_FILES_LIST_NAME)) {
  			for (String scriptConfigurationFilePath : namedOrderedListBean.getList()) {
  				if (getSpringBasedConfigPath()) {
  					DefaultResourceLoader resourceLoader = new DefaultResourceLoader(ClassLoaderUtils.getDefaultClassLoader());
  					try {
  						InputStream is = resourceLoader.getResource(scriptConfigurationFilePath).getInputStream();
  						configuration.addConfig(is);
  					} catch (Exception e) {
  						throw new ServletException(e);
  					}
  				} else {
  					super.readFile(classpathResourcePrefix + 
  							scriptConfigurationFilePath, configuration);
  				}
  			}
  		}
  		for (ModuleService moduleService : KNSServiceLocator.getKualiModuleService().getInstalledModuleServices()) {
  			for (String scriptConfigurationFilePath : moduleService.getModuleConfiguration().getScriptConfigurationFilePaths()) {
  				if (!StringUtils.isBlank(scriptConfigurationFilePath))
  					super.readFile(classpathResourcePrefix + scriptConfigurationFilePath, configuration);
  			}	
  		}
  		
  		for (String configFile : HACK_ADDITIONAL_FILES) {
  			super.readFile(classpathResourcePrefix + configFile, configuration);
  		}
  	}
  
  	public Boolean getSpringBasedConfigPath() {
  		return springBasedConfigPath;
  	}
  
  	public void setSpringBasedConfigPath(Boolean springBasedConfigPath) {
  		this.springBasedConfigPath = springBasedConfigPath;
  	}
  }