/*
 * Copyright 2012-2014 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.boot.autoconfigure;

import java.util.Locale;
import java.util.MissingResourceException;
import java.util.ResourceBundle;

import org.springframework.boot.autoconfigure.MessageSourceAutoConfiguration.ResourceBundleCondition;
import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.SpringBootCondition;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.MessageSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ConditionContext;
import org.springframework.context.annotation.Conditional;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.support.ResourceBundleMessageSource;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.core.type.AnnotatedTypeMetadata;
import org.springframework.util.StringUtils;

import static org.springframework.util.StringUtils.commaDelimitedListToStringArray;
import static org.springframework.util.StringUtils.trimAllWhitespace;

/**
 * {@link EnableAutoConfiguration Auto-configuration} for {@link MessageSource}.
 * 
 * @author Dave Syer
 */
@Configuration
@ConditionalOnMissingBean(MessageSource.class)
@Order(Ordered.HIGHEST_PRECEDENCE)
@Conditional(ResourceBundleCondition.class)
@EnableConfigurationProperties
@ConfigurationProperties(prefix = "spring.messages")
public class MessageSourceAutoConfiguration {

	private String basename = "messages";

	private String encoding = "utf-8";

	private int cacheSeconds = -1;

	@Bean
	public MessageSource messageSource() {
		ResourceBundleMessageSource messageSource = new ResourceBundleMessageSource();
		if (StringUtils.hasText(this.basename)) {
			messageSource
					.setBasenames(commaDelimitedListToStringArray(trimAllWhitespace(this.basename)));
		}
		messageSource.setDefaultEncoding(this.encoding);
		messageSource.setCacheSeconds(this.cacheSeconds);
		return messageSource;
	}

	public String getBasename() {
		return this.basename;
	}

	public void setBasename(String basename) {
		this.basename = basename;
	}

	public String getEncoding() {
		return this.encoding;
	}

	public void setEncoding(String encoding) {
		this.encoding = encoding;
	}

	public int getCacheSeconds() {
		return this.cacheSeconds;
	}

	public void setCacheSeconds(int cacheSeconds) {
		this.cacheSeconds = cacheSeconds;
	}

	protected static class ResourceBundleCondition extends SpringBootCondition {

		@Override
		public ConditionOutcome getMatchOutcome(ConditionContext context,
				AnnotatedTypeMetadata metadata) {
			String basename = context.getEnvironment().getProperty(
					"spring.messages.basename", "messages");
			if (!StringUtils.hasText(basename)) {
				return ConditionOutcome.noMatch("Empty spring.messages.basename");
			}
			for (String name : commaDelimitedListToStringArray(trimAllWhitespace(basename))) {
				try {
					ResourceBundle.getBundle(name, Locale.getDefault(),
							context.getClassLoader());
				}
				catch (MissingResourceException e) {
					return ConditionOutcome
							.noMatch("Bundle found for spring.messages.basename: " + name);
				}
			}
			return ConditionOutcome.match("Bundle found for spring.messages.basename: "
					+ basename);
		}

	}

}
