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package org.apache.james.webadmin.service;

import static org.apache.james.util.ReactorUtils.DEFAULT_CONCURRENCY;

import javax.inject.Inject;

import org.apache.james.events.Event;
import org.apache.james.events.EventBus;
import org.apache.james.events.EventDeadLetters;
import org.apache.james.events.Group;
import org.apache.james.task.Task;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.annotations.VisibleForTesting;

import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

public class EventDeadLettersRedeliverService {

    private static final Logger LOGGER = LoggerFactory.getLogger(EventDeadLettersRedeliverService.class);

    private final EventBus eventBus;
    private final EventDeadLetters deadLetters;

    @Inject
    @VisibleForTesting
    public EventDeadLettersRedeliverService(EventBus eventBus, EventDeadLetters deadLetters) {
        this.eventBus = eventBus;
        this.deadLetters = deadLetters;
    }

    Flux redeliverEvents(EventRetriever eventRetriever) {
        return eventRetriever.retrieveEvents(deadLetters)
            .flatMap(entry -> redeliverGroupEvents(entry.getT1(), entry.getT2(), entry.getT3()), DEFAULT_CONCURRENCY);
    }

    private Mono redeliverGroupEvents(Group group, Event event, EventDeadLetters.InsertionId insertionId) {
        return eventBus.reDeliver(group, event)
            .then(deadLetters.remove(group, insertionId))
            .thenReturn(Task.Result.COMPLETED)
            .onErrorResume(e -> {
                LOGGER.error("Error while performing redelivery of event: {} for group: {}",
                    event.getEventId().toString(), group.asString(), e);
                return Mono.just(Task.Result.PARTIAL);
            });
    }
}