/**
    * Copyright 2010-2012 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.common.util.property.processor;
  
  import java.util.List;
  import java.util.Properties;
  
  import org.kuali.common.util.PropertyUtils;
  import org.kuali.common.util.Str;
  import org.kuali.common.util.property.Constants;
  import org.kuali.common.util.property.GlobalPropertiesMode;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.util.PropertyPlaceholderHelper;
  
  public class ResolvePlaceholdersProcessor implements PropertyProcessor {
  
  	private static final Logger logger = LoggerFactory.getLogger(ResolvePlaceholdersProcessor.class);
  
  	PropertyPlaceholderHelper helper;
  	GlobalPropertiesMode globalPropertiesMode = GlobalPropertiesMode.BOTH;
  
  	public ResolvePlaceholdersProcessor() {
  		this(new PropertyPlaceholderHelper(Constants.DEFAULT_PLACEHOLDER_PREFIX, Constants.DEFAULT_PLACEHOLDER_SUFFIX));
  	}
  
  	public ResolvePlaceholdersProcessor(PropertyPlaceholderHelper helper) {
  		this(helper, GlobalPropertiesMode.BOTH);
  	}
  
  	public ResolvePlaceholdersProcessor(PropertyPlaceholderHelper helper, GlobalPropertiesMode globalPropertiesMode) {
  		super();
  		this.helper = helper;
  		this.globalPropertiesMode = globalPropertiesMode;
  	}
  
  	@Override
  	public void process(Properties properties) {
  		Properties resolvedProperties = getResolvedProperties(properties, helper);
  		logger.info("Resolved {} property values", resolvedProperties.size());
  		properties.putAll(resolvedProperties);
  	}
  
  	protected Properties getResolvedProperties(Properties props, PropertyPlaceholderHelper helper) {
  		Properties global = PropertyUtils.getProperties(props, globalPropertiesMode);
  		List<String> keys = PropertyUtils.getSortedKeys(props);
  		Properties newProps = new Properties();
  		for (String key : keys) {
  			String originalValue = props.getProperty(key);
  			String resolvedValue = helper.replacePlaceholders(originalValue, global);
  			if (!resolvedValue.equals(originalValue)) {
  				logger.debug("Resolved property '" + key + "' [{}] -> [{}]", Str.flatten(originalValue), Str.flatten(resolvedValue));
  			}
  			newProps.setProperty(key, resolvedValue);
  		}
  		return newProps;
  	}
  
  	public PropertyPlaceholderHelper getHelper() {
  		return helper;
  	}
  
  	public void setHelper(PropertyPlaceholderHelper helper) {
  		this.helper = helper;
  	}
  
  	public GlobalPropertiesMode getGlobalPropertiesMode() {
  		return globalPropertiesMode;
  	}
  
  	public void setGlobalPropertiesMode(GlobalPropertiesMode globalPropertiesMode) {
  		this.globalPropertiesMode = globalPropertiesMode;
  	}
  }