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/*
 * Copyright 2017-2020 original 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
 *
 * https://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 io.micronaut.management.endpoint.beans;

import io.micronaut.context.BeanContext;
import io.micronaut.core.async.annotation.SingleResult;
import io.micronaut.inject.BeanDefinition;
import io.micronaut.management.endpoint.annotation.Endpoint;
import io.micronaut.management.endpoint.annotation.Read;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Mono;

import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.stream.Collectors;

/**
 * Exposes an {@link Endpoint} to provide information about the beans of the application.
 *
 * @author James Kleeh
 * @since 1.0
 */
@Endpoint("beans")
public class BeansEndpoint {

    private BeanContext beanContext;
    private BeanDefinitionDataCollector beanDefinitionDataCollector;

    /**
     * @param beanContext                 The {@link BeanContext}
     * @param beanDefinitionDataCollector The {@link BeanDefinitionDataCollector}
     */
    public BeansEndpoint(BeanContext beanContext, BeanDefinitionDataCollector beanDefinitionDataCollector) {
        this.beanContext = beanContext;
        this.beanDefinitionDataCollector = beanDefinitionDataCollector;
    }

    /**
     * @return A {@link org.reactivestreams.Publisher} with the beans
     */
    @Read
    @SingleResult
    public Publisher getBeans() {
        List> beanDefinitions = beanContext.getAllBeanDefinitions()
                .stream()
                .sorted(Comparator.comparing((BeanDefinition bd) -> bd.getClass().getName()))
                .collect(Collectors.toList());
        return Mono.from(beanDefinitionDataCollector.getData(beanDefinitions))
                    .defaultIfEmpty(Collections.emptyMap());
    }
}