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package org.apache.james.webadmin.service;

import java.time.Clock;
import java.util.Optional;
import java.util.concurrent.atomic.AtomicLong;

import org.apache.james.task.Task;
import org.apache.james.task.TaskExecutionDetails;
import org.apache.james.task.TaskType;
import org.apache.james.webadmin.service.EventDeadLettersRedeliveryTaskAdditionalInformationDTO.EventDeadLettersRedeliveryTaskAdditionalInformationForAll;

public class EventDeadLettersRedeliverAllTask implements Task {
    public static final TaskType TYPE = TaskType.of("event-dead-letters-redeliver-all");

    private final EventDeadLettersRedeliverService service;
    private final EventRetriever eventRetriever;
    private final AtomicLong successfulRedeliveriesCount;
    private final AtomicLong failedRedeliveriesCount;

    EventDeadLettersRedeliverAllTask(EventDeadLettersRedeliverService service) {
        this.service = service;
        this.eventRetriever = EventRetriever.allEvents();
        this.successfulRedeliveriesCount = new AtomicLong(0L);
        this.failedRedeliveriesCount = new AtomicLong(0L);
    }

    @Override
    public Result run() {
        return service.redeliverEvents(eventRetriever)
            .map(this::updateCounters)
            .reduce(Result.COMPLETED, Task::combine)
            .block();
    }

    private Result updateCounters(Result result) {
        switch (result) {
            case COMPLETED:
                successfulRedeliveriesCount.incrementAndGet();
                break;
            case PARTIAL:
                failedRedeliveriesCount.incrementAndGet();
                break;
            default:
                throw new RuntimeException("Result case: " + result.toString() + " not recognized");
        }
        return result;
    }

    @Override
    public TaskType type() {
        return TYPE;
    }

    @Override
    public Optional details() {
        return Optional.of(createAdditionalInformation());
    }

    private EventDeadLettersRedeliveryTaskAdditionalInformation createAdditionalInformation() {
        return new EventDeadLettersRedeliveryTaskAdditionalInformationForAll(
            successfulRedeliveriesCount.get(),
            failedRedeliveriesCount.get(),
            Clock.systemUTC().instant());
    }
}