/*
 * Copyright 2015 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.integration.config;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;

import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.context.EnvironmentAware;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.ImportAware;
import org.springframework.context.annotation.Role;
import org.springframework.core.annotation.AnnotationAttributes;
import org.springframework.core.env.Environment;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.integration.support.management.IntegrationManagementConfigurer;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;

/**
 * {@code @Configuration} class that registers a {@link IntegrationManagementConfigurer} bean.
 *
 * <p>This configuration class is automatically imported when using the
 * {@link EnableIntegrationManagement} annotation. See its javadoc for complete usage details.
 *
 * @author Artem Bilan
 * @author Gary Russell
 * @since 4.2
 */
@Configuration
public class IntegrationManagementConfiguration implements ImportAware, EnvironmentAware {

	private AnnotationAttributes attributes;

	private Environment environment;

	@Override
	public void setEnvironment(Environment environment) {
		this.environment = environment;
	}

	@Override
	public void setImportMetadata(AnnotationMetadata importMetadata) {
		Map<String, Object> map = importMetadata.getAnnotationAttributes(EnableIntegrationManagement.class.getName());
		this.attributes = AnnotationAttributes.fromMap(map);
		Assert.notNull(this.attributes,
				"@EnableIntegrationManagement is not present on importing class " + importMetadata.getClassName());
	}

	@Bean(name = IntegrationManagementConfigurer.MANAGEMENT_CONFIGURER_NAME)
	@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
	public IntegrationManagementConfigurer managementConfigurer() {
		IntegrationManagementConfigurer configurer = new IntegrationManagementConfigurer();
		setupCountsEnabledNamePatterns(configurer);
		setupStatsEnabledNamePatterns(configurer);
		configurer.setDefaultLoggingEnabled(
				Boolean.parseBoolean(this.environment.resolvePlaceholders(
						(String) this.attributes.get("defaultLoggingEnabled"))));
		configurer.setDefaultCountsEnabled(
				Boolean.parseBoolean(this.environment.resolvePlaceholders(
						(String) this.attributes.get("defaultCountsEnabled"))));
		configurer.setDefaultStatsEnabled(
				Boolean.parseBoolean(this.environment.resolvePlaceholders(
						(String) this.attributes.get("defaultStatsEnabled"))));
		configurer.setMetricsFactoryBeanName((String) this.attributes.get("metricsFactory"));
		return configurer;
	}

	private void setupCountsEnabledNamePatterns(IntegrationManagementConfigurer configurer) {
		List<String> patterns = new ArrayList<String>();
		String[] countsEnabled = this.attributes.getStringArray("countsEnabled");
		for (String managedComponent : countsEnabled) {
			String pattern = this.environment.resolvePlaceholders(managedComponent);
			patterns.addAll(Arrays.asList(StringUtils.commaDelimitedListToStringArray(pattern)));
		}
		configurer.setEnabledCountsPatterns(patterns.toArray(new String[patterns.size()]));
	}

	private void setupStatsEnabledNamePatterns(IntegrationManagementConfigurer configurer) {
		List<String> patterns = new ArrayList<String>();
		String[] statsEnabled = this.attributes.getStringArray("statsEnabled");
		for (String managedComponent : statsEnabled) {
			String pattern = this.environment.resolvePlaceholders(managedComponent);
			patterns.addAll(Arrays.asList(StringUtils.commaDelimitedListToStringArray(pattern)));
		}
		configurer.setEnabledStatsPatterns(patterns.toArray(new String[patterns.size()]));
	}

}