/*
 * Copyright 2011 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 org.springframework.data.mongodb.repository.config;

import org.springframework.data.mongodb.repository.support.MongoRepositoryFactoryBean;
import org.springframework.data.repository.config.AutomaticRepositoryConfigInformation;
import org.springframework.data.repository.config.ManualRepositoryConfigInformation;
import org.springframework.data.repository.config.RepositoryConfig;
import org.springframework.data.repository.config.SingleRepositoryConfigInformation;
import org.springframework.util.StringUtils;
import org.w3c.dom.Element;

/**
 * {@link RepositoryConfig} implementation to create {@link MongoRepositoryConfiguration} instances for both automatic
 * and manual configuration.
 * 
 * @author Oliver Gierke
 */
public class SimpleMongoRepositoryConfiguration
		extends
		RepositoryConfig<SimpleMongoRepositoryConfiguration.MongoRepositoryConfiguration, SimpleMongoRepositoryConfiguration> {

	private static final String MONGO_TEMPLATE_REF = "mongo-template-ref";
	private static final String CREATE_QUERY_INDEXES = "create-query-indexes";
	private static final String DEFAULT_MONGO_TEMPLATE_REF = "mongoTemplate";

	/**
	 * Creates a new {@link SimpleMongoRepositoryConfiguration} for the given {@link Element}.
	 * 
	 * @param repositoriesElement
	 */
	protected SimpleMongoRepositoryConfiguration(Element repositoriesElement) {

		super(repositoriesElement, MongoRepositoryFactoryBean.class.getName());
	}

	/**
	 * Returns the bean name of the {@link org.springframework.data.mongodb.core.core.MongoTemplate} to be referenced.
	 * 
	 * @return
	 */
	public String getMongoTemplateRef() {

		String templateRef = getSource().getAttribute(MONGO_TEMPLATE_REF);
		return StringUtils.hasText(templateRef) ? templateRef : DEFAULT_MONGO_TEMPLATE_REF;
	}

	/**
	 * Returns whether to create indexes for query methods.
	 * 
	 * @return
	 */
	public boolean getCreateQueryIndexes() {

		String createQueryIndexes = getSource().getAttribute(CREATE_QUERY_INDEXES);
		return StringUtils.hasText(createQueryIndexes) ? Boolean.parseBoolean(createQueryIndexes) : false;
	}

	/*
	* (non-Javadoc)
	*
	* @see
	* org.springframework.data.repository.config.GlobalRepositoryConfigInformation
	* #getAutoconfigRepositoryInformation(java.lang.String)
	*/
	public MongoRepositoryConfiguration getAutoconfigRepositoryInformation(String interfaceName) {

		return new AutomaticMongoRepositoryConfiguration(interfaceName, this);
	}

	/*
	 * (non-Javadoc)
	 * @see org.springframework.data.repository.config.RepositoryConfig#getNamedQueriesLocation()
	 */
	public String getNamedQueriesLocation() {
		return "classpath*:META-INF/mongo-named-queries.properties";
	}

	/*
	* (non-Javadoc)
	*
	* @see org.springframework.data.repository.config.RepositoryConfig#
	* createSingleRepositoryConfigInformationFor(org.w3c.dom.Element)
	*/
	@Override
	protected MongoRepositoryConfiguration createSingleRepositoryConfigInformationFor(Element element) {

		return new ManualMongoRepositoryConfiguration(element, this);
	}

	/**
	 * Simple interface for configuration values specific to Mongo repositories.
	 * 
	 * @author Oliver Gierke
	 */
	public interface MongoRepositoryConfiguration extends
			SingleRepositoryConfigInformation<SimpleMongoRepositoryConfiguration> {

		String getMongoTemplateRef();

		boolean getCreateQueryIndexes();
	}

	/**
	 * Implements manual lookup of the additional attributes.
	 * 
	 * @author Oliver Gierke
	 */
	private static class ManualMongoRepositoryConfiguration extends
			ManualRepositoryConfigInformation<SimpleMongoRepositoryConfiguration> implements MongoRepositoryConfiguration {

		/**
		 * Creates a new {@link ManualMongoRepositoryConfiguration} for the given {@link Element} and parent.
		 * 
		 * @param element
		 * @param parent
		 */
		public ManualMongoRepositoryConfiguration(Element element, SimpleMongoRepositoryConfiguration parent) {

			super(element, parent);
		}

		/*
		* (non-Javadoc)
		*
		* @see org.springframework.data.mongodb.repository.config.
		* SimpleMongoRepositoryConfiguration
		* .MongoRepositoryConfiguration#getMongoTemplateRef()
		*/
		public String getMongoTemplateRef() {

			return getAttribute(MONGO_TEMPLATE_REF);
		}

		/* (non-Javadoc)
		 * @see org.springframework.data.mongodb.config.SimpleMongoRepositoryConfiguration.MongoRepositoryConfiguration#getCreateQueryIndexes()
		 */
		public boolean getCreateQueryIndexes() {

			String attribute = getAttribute(CREATE_QUERY_INDEXES);
			return attribute == null ? false : Boolean.parseBoolean(attribute);
		}
	}

	/**
	 * Implements the lookup of the additional attributes during automatic configuration.
	 * 
	 * @author Oliver Gierke
	 */
	private static class AutomaticMongoRepositoryConfiguration extends
			AutomaticRepositoryConfigInformation<SimpleMongoRepositoryConfiguration> implements MongoRepositoryConfiguration {

		/**
		 * Creates a new {@link AutomaticMongoRepositoryConfiguration} for the given interface and parent.
		 * 
		 * @param interfaceName
		 * @param parent
		 */
		public AutomaticMongoRepositoryConfiguration(String interfaceName, SimpleMongoRepositoryConfiguration parent) {

			super(interfaceName, parent);
		}

		/*
		* (non-Javadoc)
		*
		* @see org.springframework.data.mongodb.repository.config.
		* SimpleMongoRepositoryConfiguration
		* .MongoRepositoryConfiguration#getMongoTemplateRef()
		*/
		public String getMongoTemplateRef() {

			return getParent().getMongoTemplateRef();
		}

		/* (non-Javadoc)
		 * @see org.springframework.data.mongodb.config.SimpleMongoRepositoryConfiguration.MongoRepositoryConfiguration#getCreateQueryIndexes()
		 */
		public boolean getCreateQueryIndexes() {
			return getParent().getCreateQueryIndexes();
		}
	}
}