/**
    * 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 static org.apache.commons.lang.StringUtils.isBlank;
  import static org.apache.commons.lang.StringUtils.isEmpty;
  
  import java.util.Map;
  
  import org.apache.commons.beanutils.BeanUtils;
  import org.kuali.core.db.torque.PropertyHandlingException;
  import org.kuali.db.DatabaseType;
  import org.kuali.db.JDBCConfiguration;
  import org.kuali.db.JDBCUtils;
  
  public class JdbcConfigurer {
  	JDBCUtils jdbcUtils = new JDBCUtils();
  
  	@SuppressWarnings("unchecked")
  	protected boolean hasProperty(String name, Object bean) throws PropertyHandlingException {
  		try {
  			Map<String, Object> description = BeanUtils.describe(bean);
  			return description.containsKey(name);
  		} catch (Exception e) {
  			throw new PropertyHandlingException(e);
  		}
  
  	}
  
  	@SuppressWarnings("unchecked")
  	protected <T> T getProperty(String name, Object bean) {
  		try {
  			if (hasProperty(name, bean)) {
  				return (T) BeanUtils.getProperty(bean, name);
  			} else {
  				return null;
  			}
  		} catch (Exception e) {
  			throw new RuntimeException(e);
  		}
  	}
  
  	protected void setProperty(Object bean, String name, Object value) throws PropertyHandlingException {
  		try {
  			BeanUtils.copyProperty(bean, name, value);
  		} catch (Exception e) {
  			throw new PropertyHandlingException(e);
  		}
  	}
  
  	public void updateConfiguration(Object bean) throws PropertyHandlingException {
  		String url = getProperty("url", bean);
  		if (isEmpty(url)) {
  			// If the url is empty, there is nothing to do
  			return;
  		}
  
  		JDBCConfiguration config = jdbcUtils.getDatabaseConfiguration(url);
  		if (config.equals(JDBCConfiguration.UNKNOWN_CONFIG)) {
  			return;
  		}
  
  		String driver = getProperty("driver", bean);
  		if (isBlank(driver)) {
  			setProperty(bean, "driver", config.getDriver());
  		}
  
  		String targetDatabase = getProperty("targetDatabase", bean);
  		if (isBlank(targetDatabase)) {
  			setProperty(bean, "targetDatabase", config.getType().toString().toLowerCase());
  		}
  	}
  
  	public void validateConfiguration(Object bean) {
  		String driver = getProperty("driver", bean);
  		if (isBlank(driver)) {
  			throw new IllegalArgumentException("No database driver. Specify one in the plugin configuration.");
  		}
  
  		String url = getProperty("url", bean);
  		if (isBlank(url)) {
  			throw new IllegalArgumentException(getEmptyURLErrorMessage());
  		}
  
  		String targetDatabase = getProperty("targetDatabase", bean);
  		try {
 			DatabaseType.valueOf(targetDatabase.toUpperCase());
 		} catch (IllegalArgumentException e) {
 			throw new IllegalArgumentException("Database type of '" + targetDatabase + "' is invalid.  Valid values: " + org.springframework.util.StringUtils.arrayToCommaDelimitedString(DatabaseType.values()));
 		}
 
 		try {
 			Class.forName(driver);
 		} catch (ClassNotFoundException e) {
 			throw new IllegalArgumentException("Can't load driver class " + driver + ". Be sure to include it as a plugin dependency.");
 		}
 	}
 
 	protected String getEmptyURLErrorMessage() {
 		StringBuffer sb = new StringBuffer();
 		sb.append("\n\n");
 		sb.append("No url was supplied.\n");
 		sb.append("You can specify a url in the plugin configuration or provide it as a system property.\n\n");
 		sb.append("For example:\n\n");
 		sb.append("-Durl=jdbc:oracle:thin:@localhost:1521:XE (oracle)\n");
 		sb.append("-Durl=jdbc:mysql://localhost:3306/<database> (mysql)\n");
 		sb.append("\n.");
 		return sb.toString();
 	}
 }