/*
    * Copyright 2011 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.ole.docstore.discovery.util;
  
  import java.io.File;
  import java.io.IOException;
  import java.util.List;
  import java.util.Properties;
  
  import org.kuali.ole.utility.ConfigUtil;
  import org.kuali.ole.utility.Constants;
  import org.kuali.ole.utility.PropertyUtils;
  import org.kuali.ole.utility.ResourceUtil;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * 
   */
  public class PropertyUtil {
  	private static final Logger LOG = LoggerFactory.getLogger(PropertyUtil.class);
  	ResourceUtil resourceUtil = new ResourceUtil();
  	ConfigUtil configUtil = new ConfigUtil();
  	private static PropertyUtil propertyUtil = null;
  	private static String DEFAULT_PROPERTIES_FILENAME = "ole-discovery.properties";
  	private static String DEFAULT_PROPERTIES_LOCATION = "classpath:" + DEFAULT_PROPERTIES_FILENAME;
  	private static String SYSTEM_PROPERTY = "discovery.properties.file";
  	private static String DOCSEARCH_URL_PROPERTY = "docSearchURL";
  
  	public static synchronized PropertyUtil getPropertyUtil() {
  		if (propertyUtil == null) {
  			propertyUtil = new PropertyUtil();
  		}
  		return propertyUtil;
  	}
  
  	private Properties props;
  
  	private PropertyUtil() {
  		try {
  			String externalConfigFile = getExternalConfigFile();
  			List<String> locations = PropertyUtils.getLocations(DEFAULT_PROPERTIES_LOCATION, SYSTEM_PROPERTY, externalConfigFile);
  			props = PropertyUtils.getAppEnvironmentProperties(locations);
  			LOG.info(DOCSEARCH_URL_PROPERTY + "=" + props.getProperty(DOCSEARCH_URL_PROPERTY));
  		} catch (IOException e) {
  			throw new IllegalStateException("Exception loading properties", e);
  		}
  	}
  
  	public String getProperty(String key) {
  		return props.getProperty(key);
  	}
  
  	public Properties getProperties() {
  		Properties p = new Properties();
  		p.putAll(props);
  		return p;
  	}
  
  	public String getExternalConfigFile() {
  		StringBuilder sb = new StringBuilder();
  		sb.append(configUtil.getApplicationHome(Constants.KUALI_GROUP, Constants.OLE_DOCSTORE_APP));
  		sb.append(File.separator + Constants.OLE_DISCOVERY_APP);
  		sb.append(File.separator + "properties" + File.separator);
  		sb.append(DEFAULT_PROPERTIES_FILENAME);
  		return sb.toString();
  	}
  }