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/*
 * Copyright 2020 Ingyu Hwang
 *
 * 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.timelimiter.monitoring.endpoint;

import io.github.resilience4j.common.timelimiter.monitoring.endpoint.TimeLimiterEventDTO;
import io.github.resilience4j.common.timelimiter.monitoring.endpoint.TimeLimiterEventsEndpointResponse;
import io.github.resilience4j.consumer.CircularEventConsumer;
import io.github.resilience4j.consumer.EventConsumerRegistry;
import io.github.resilience4j.timelimiter.event.TimeLimiterEvent;
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 = "timelimiterevents")
public class TimeLimiterEventsEndpoint {

    private final EventConsumerRegistry eventsConsumerRegistry;

    public TimeLimiterEventsEndpoint(EventConsumerRegistry eventsConsumerRegistry) {
        this.eventsConsumerRegistry = eventsConsumerRegistry;
    }

    @ReadOperation
    public TimeLimiterEventsEndpointResponse getAllTimeLimiterEvents() {
        return new TimeLimiterEventsEndpointResponse(eventsConsumerRegistry.getAllEventConsumer()
                .flatMap(CircularEventConsumer::getBufferedEvents)
                .sorted(Comparator.comparing(TimeLimiterEvent::getCreationTime))
                .map(TimeLimiterEventDTO::createTimeLimiterEventDTO).toJavaList());
    }

    @ReadOperation
    public TimeLimiterEventsEndpointResponse getEventsFilteredByTimeLimiterName(@Selector String name) {
        return new TimeLimiterEventsEndpointResponse(getTimeLimiterEvents(name)
                .map(TimeLimiterEventDTO::createTimeLimiterEventDTO).toJavaList());
    }

    @ReadOperation
    public TimeLimiterEventsEndpointResponse getEventsFilteredByTimeLimiterNameAndEventType(@Selector String name,
                                                                                            @Selector String eventType) {
        TimeLimiterEvent.Type targetType = TimeLimiterEvent.Type.valueOf(eventType.toUpperCase());
        return new TimeLimiterEventsEndpointResponse(getTimeLimiterEvents(name)
                .filter(event -> event.getEventType() == targetType)
                .map(TimeLimiterEventDTO::createTimeLimiterEventDTO).toJavaList());
    }

    private List getTimeLimiterEvents(String name) {
        CircularEventConsumer eventConsumer = eventsConsumerRegistry.getEventConsumer(name);
        if(eventConsumer != null){
            return eventConsumer.getBufferedEvents()
                    .filter(event -> event.getTimeLimiterName().equals(name));
        }else{
            return List.empty();
        }
    }

}