/**
    * Copyright 2004-2012 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.apache.torque.util;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.InputStreamReader;
  import java.io.Reader;
  import java.util.Map;
  import java.util.Properties;
  import java.util.Set;
  
  import org.apache.commons.beanutils.BeanUtils;
  import org.apache.commons.lang.StringUtils;
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.kuali.core.db.torque.PropertyHandlingException;
  import org.kuali.core.db.torque.Utils;
  import org.springframework.core.io.DefaultResourceLoader;
  import org.springframework.core.io.Resource;
  import org.springframework.core.io.ResourceLoader;
  
  public class BeanPropertiesLoader {
  	private static final Log log = LogFactory.getLog(BeanPropertiesLoader.class);
  
  	Utils utils = new Utils();
  	String location;
  	String encoding;
  	Object bean;
  	boolean overrideExistingPropertyValues = true;
  	boolean overrideSystemProperties = false;
  	String description;
  
  	public BeanPropertiesLoader() {
  		this(null, null, null, null);
  	}
  
  	public BeanPropertiesLoader(Object bean, String location, String encoding, String description) {
  		super();
  		this.bean = bean;
  		this.location = location;
  		this.encoding = encoding;
  		this.description = description;
  	}
  
  	public boolean isPropertiesExist() {
  		return utils.isFileOrResource(location);
  	}
  
  	protected boolean isSkip(Map<String, Object> description, String key) {
  		Object value = description.get(key);
  		if (value != null && !isOverrideExistingPropertyValues()) {
  			// The property is already set, don't override it unless they have asked us to
  			log.debug("Skipping property " + key + " it is already set to " + value);
  			return true;
  		}
  		Set<String> beanProperties = description.keySet();
  		if (!beanProperties.contains(key)) {
  			// This is not a property of the bean
  			log.debug("Skipping property " + key + " as it is not a property of this bean");
  			return true;
  		}
  		return false;
  	}
  
  	@SuppressWarnings("unchecked")
  	public void loadToBean() throws PropertyHandlingException {
  		if (!utils.isFileOrResource(location)) {
  			log.info("------------------------------------------------------------------------");
  			log.warn("No properties file located at " + location);
  			log.info("------------------------------------------------------------------------");
  			return;
  		} else {
  			log.info("------------------------------------------------------------------------");
  			log.info("Loading " + getDescription() + " properties from " + location);
  			log.info("------------------------------------------------------------------------");
  		}
  		try {
  			Properties properties = getProperties();
  			if (!overrideSystemProperties) {
  				properties.putAll(System.getProperties());
  			}
  			Set<String> keys = properties.stringPropertyNames();
  			Map<String, Object> description = BeanUtils.describe(bean);
  			for (String key : keys) {
  				if (isSkip(description, key)) {
 					continue;
 				}
 				// Extract the value and set it on the bean
 				String newValue = properties.getProperty(key);
 				log.info("Setting " + key + "=" + getLogValue(key, newValue));
 				BeanUtils.copyProperty(bean, key, newValue);
 			}
 		} catch (Exception e) {
 			throw new PropertyHandlingException(e);
 		}
 	}
 
 	/**
 	 * Don't display password'ish type properties
 	 */
 	protected String getLogValue(String key, String value) {
 		int pos = key.toLowerCase().indexOf("password");
 		if (pos == -1) {
 			return value;
 		} else {
 			return StringUtils.repeat("*", value.length());
 		}
 	}
 
 	/**
 	 * Load the properties file into a Properties object
 	 */
 	public Properties getProperties() throws PropertyHandlingException {
 		try {
 			Reader reader = getReader();
 			Properties properties = new Properties();
 			properties.load(reader);
 			return properties;
 		} catch (Exception e) {
 			throw new PropertyHandlingException(e);
 		}
 	}
 
 	/**
 	 * Return a Reader for reading in the properties file. First check the file system to see if the file exists. If
 	 * not, return a Reader using Spring Resource loading
 	 */
 	protected Reader getReader() throws PropertyHandlingException {
 		try {
 			File file = new File(location);
 			if (file.exists()) {
 				return new InputStreamReader(new FileInputStream(file), getEncoding());
 			}
 			ResourceLoader loader = new DefaultResourceLoader();
 			Resource resource = loader.getResource(location);
 			return new InputStreamReader(resource.getInputStream(), getEncoding());
 		} catch (Exception e) {
 			throw new PropertyHandlingException(e);
 		}
 	}
 
 	public String getLocation() {
 		return location;
 	}
 
 	public void setLocation(String location) {
 		this.location = location;
 	}
 
 	public String getEncoding() {
 		return encoding;
 	}
 
 	public void setEncoding(String encoding) {
 		this.encoding = encoding;
 	}
 
 	public Object getBean() {
 		return bean;
 	}
 
 	public void setBean(Object bean) {
 		this.bean = bean;
 	}
 
 	public boolean isOverrideExistingPropertyValues() {
 		return overrideExistingPropertyValues;
 	}
 
 	public void setOverrideExistingPropertyValues(boolean override) {
 		this.overrideExistingPropertyValues = override;
 	}
 
 	public String getDescription() {
 		return description;
 	}
 
 	public void setDescription(String description) {
 		this.description = description;
 	}
 
 	public boolean isOverrideSystemProperties() {
 		return overrideSystemProperties;
 	}
 
 	public void setOverrideSystemProperties(boolean overrideSystemProperties) {
 		this.overrideSystemProperties = overrideSystemProperties;
 	}
 
 }