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/*
 * Copyright 2019 lespinsideg
 *
 * 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 io.github.resilience4j.bulkhead.monitoring.endpoint;

import io.github.resilience4j.bulkhead.ThreadPoolBulkhead;
import io.github.resilience4j.bulkhead.event.BulkheadEvent;
import io.github.resilience4j.common.bulkhead.monitoring.endpoint.BulkheadEventDTO;
import io.github.resilience4j.common.bulkhead.monitoring.endpoint.BulkheadEventDTOFactory;
import io.github.resilience4j.common.bulkhead.monitoring.endpoint.BulkheadEventsEndpointResponse;
import io.github.resilience4j.consumer.CircularEventConsumer;
import io.github.resilience4j.consumer.EventConsumerRegistry;
import io.vavr.collection.List;
import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;
import org.springframework.boot.actuate.endpoint.annotation.Selector;

import java.util.Comparator;

@Endpoint(id = "bulkheadevents")
public class BulkheadEventsEndpoint {
	private final EventConsumerRegistry eventConsumerRegistry;

	public BulkheadEventsEndpoint(EventConsumerRegistry eventConsumerRegistry) {
		this.eventConsumerRegistry = eventConsumerRegistry;
	}

	@ReadOperation
	public BulkheadEventsEndpointResponse getAllBulkheadEvents() {
		java.util.List response = eventConsumerRegistry.getAllEventConsumer()
				.flatMap(CircularEventConsumer::getBufferedEvents)
				.sorted(Comparator.comparing(BulkheadEvent::getCreationTime))
				.map(BulkheadEventDTOFactory::createBulkheadEventDTO)
				.toJavaList();

		return new BulkheadEventsEndpointResponse(response);
	}

	@ReadOperation
	public BulkheadEventsEndpointResponse getEventsFilteredByBulkheadName(@Selector String bulkheadName) {
		java.util.List response = getBulkheadEvent(bulkheadName)
				.map(BulkheadEventDTOFactory::createBulkheadEventDTO)
				.toJavaList();

		return new BulkheadEventsEndpointResponse(response);
	}

	@ReadOperation
	public BulkheadEventsEndpointResponse getEventsFilteredByBulkheadNameAndEventType(@Selector String bulkheadName, @Selector String eventType) {
		java.util.List response = getBulkheadEvent(bulkheadName)
				.filter(event -> event.getEventType() == BulkheadEvent.Type.valueOf(eventType.toUpperCase()))
				.map(BulkheadEventDTOFactory::createBulkheadEventDTO)
				.toJavaList();

		return new BulkheadEventsEndpointResponse(response);
	}

	private List getBulkheadEvent(String bulkheadName) {
		CircularEventConsumer eventConsumer = eventConsumerRegistry.getEventConsumer(bulkheadName);
		if (eventConsumer == null) {
			CircularEventConsumer threadPoolEventConsumer = eventConsumerRegistry.getEventConsumer(String.join("-", ThreadPoolBulkhead.class.getSimpleName(), bulkheadName));
			if (threadPoolEventConsumer != null) {
				return threadPoolEventConsumer.getBufferedEvents()
						.filter(event -> event.getBulkheadName().equals(bulkheadName));
			} else {
				return List.empty();
			}
		} else {
			return eventConsumer.getBufferedEvents()
					.filter(event -> event.getBulkheadName().equals(bulkheadName));
		}
	}
}