/*
 * Copyright 2012-2017 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.actuate.autoconfigure;

import java.lang.annotation.Annotation;

import org.springframework.boot.autoconfigure.condition.ConditionMessage;
import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
import org.springframework.boot.autoconfigure.condition.SpringBootCondition;
import org.springframework.context.annotation.ConditionContext;
import org.springframework.core.annotation.AnnotationAttributes;
import org.springframework.core.env.Environment;
import org.springframework.core.type.AnnotatedTypeMetadata;

/**
 * Base endpoint element condition. An element can be disabled globally via the
 * {@code defaults} name or individually via the name of the element.
 *
 * @author Stephane Nicoll
 * @author Madhura Bhave
 */
abstract class OnEnabledEndpointElementCondition extends SpringBootCondition {

	private final String prefix;

	private final Class<? extends Annotation> annotationType;

	OnEnabledEndpointElementCondition(String prefix,
			Class<? extends Annotation> annotationType) {
		this.prefix = prefix;
		this.annotationType = annotationType;
	}

	@Override
	public ConditionOutcome getMatchOutcome(ConditionContext context,
			AnnotatedTypeMetadata metadata) {
		AnnotationAttributes annotationAttributes = AnnotationAttributes
				.fromMap(metadata.getAnnotationAttributes(this.annotationType.getName()));
		String endpointName = annotationAttributes.getString("value");
		ConditionOutcome outcome = getEndpointOutcome(context, endpointName);
		if (outcome != null) {
			return outcome;
		}
		return getDefaultEndpointsOutcome(context);
	}

	protected ConditionOutcome getEndpointOutcome(ConditionContext context,
			String endpointName) {
		Environment environment = context.getEnvironment();
		String enabledProperty = this.prefix + endpointName + ".enabled";
		if (environment.containsProperty(enabledProperty)) {
			boolean match = environment.getProperty(enabledProperty, Boolean.class, true);
			return new ConditionOutcome(match,
					ConditionMessage.forCondition(this.annotationType).because(
							this.prefix + endpointName + ".enabled is " + match));
		}
		return null;
	}

	protected ConditionOutcome getDefaultEndpointsOutcome(ConditionContext context) {
		boolean match = Boolean.valueOf(context.getEnvironment()
				.getProperty(this.prefix + "defaults.enabled", "true"));
		return new ConditionOutcome(match,
				ConditionMessage.forCondition(this.annotationType).because(
						this.prefix + "defaults.enabled is considered " + match));
	}

}
