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/*
 * Copyright 2012-2016 the original author or authors.
 *
 * Licensed under the Apache 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.apache.org/licenses/LICENSE-2.0
 *
 * 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 com.integralblue.log4jdbc.spring;

import javax.annotation.PostConstruct;
import javax.sql.DataSource;

import net.sf.log4jdbc.log.slf4j.Slf4jSpyLogDelegator;
import net.sf.log4jdbc.sql.jdbcapi.DataSourceSpy;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.core.env.Environment;

/**
 * A {@link BeanPostProcessor} implementation that sets up log4jdbc logging.
 * To do so, it:
 * 
 * Copies log4jdbc configuration properties from the Spring {@link Environment} to system properties (log4jdbc only reads system properties)
 * Wraps {@link DataSource} beans with {@link DataSourceSpy}
 * 
 *
 * @author Craig Andrews
 * @see net.sf.log4jdbc.Properties
 */
public class Log4jdbcBeanPostProcessor implements BeanPostProcessor {
	@Autowired
	private Environment environment;

	private static final String[] PROPERTIES_TO_COPY = {
			"log4jdbc.log4j2.properties.file",
			"log4jdbc.debug.stack.prefix",
			"log4jdbc.sqltiming.warn.threshold",
			"log4jdbc.sqltiming.error.threshold",
			"log4jdbc.dump.booleanastruefalse",
			"log4jdbc.dump.fulldebugstacktrace",
			"log4jdbc.dump.sql.maxlinelength",
			"log4jdbc.statement.warn",
			"log4jdbc.dump.sql.select",
			"log4jdbc.dump.sql.insert",
			"log4jdbc.dump.sql.update",
			"log4jdbc.dump.sql.delete",
			"log4jdbc.dump.sql.create",
			"log4jdbc.dump.sql.addsemicolon",
			"log4jdbc.auto.load.popular.drivers",
			"log4jdbc.drivers",
			"log4jdbc.trim.sql",
			"log4jdbc.trim.sql.extrablanklines",
			"log4jdbc.suppress.generated.keys.exception",
			"log4jdbc.log4j2.properties.file",
			};

	@Override
	public Object postProcessBeforeInitialization(final Object bean, final String beanName) throws BeansException {
		return bean;
	}

	@Override
	public Object postProcessAfterInitialization(final Object bean, final String beanName) throws BeansException {
		if (bean instanceof DataSource) {
			return new DataSourceSpy((DataSource) bean);
		}
		else {
			return bean;
		}
	}

	@PostConstruct
	public void postConstruct() {
		// Log4jdbc only reads configuration from system properties, so copy relevant environment property to system properties
		// See net.sf.log4jdbc.Properties.getProperties()
		for (final String property : PROPERTIES_TO_COPY) {
			if (this.environment.containsProperty(property)) {
				System.setProperty(property, this.environment.getProperty(property));
			}
		}
		// Use slf4j by default.
		// Most users will have slf4j configured (because Spring does that by default) and they won't be using log4j (which is the log4jdbc default)
		System.setProperty("log4jdbc.spylogdelegator.name", this.environment.getProperty("log4jdbc.spylogdelegator.name", Slf4jSpyLogDelegator.class.getName()));
	}

}