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/*
 * (c) Copyright 2016 Palantir Technologies Inc. All rights reserved.
 */

package com.palantir.docker.compose.execution;

import static java.util.stream.Collectors.toList;

import com.palantir.docker.compose.configuration.ShutdownStrategy;
import com.palantir.docker.compose.connection.ContainerName;
import java.io.IOException;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Shuts down containers as fast as possible, without giving them time to finish
 * IO or clean up any resources.
 *
 * @deprecated Use {@link ShutdownStrategy#KILL_DOWN}
 */
@Deprecated
public class AggressiveShutdownStrategy implements ShutdownStrategy {

    private static final Logger log = LoggerFactory.getLogger(AggressiveShutdownStrategy.class);

    @Override
    public void shutdown(DockerCompose dockerCompose, Docker docker) throws IOException, InterruptedException {
        List runningContainers = dockerCompose.ps();

        log.info("Shutting down {}", runningContainers.stream().map(ContainerName::semanticName).collect(toList()));
        if (removeContainersCatchingErrors(docker, runningContainers)) {
            return;
        }

        log.debug("First shutdown attempted failed due to btrfs volume error... retrying");
        if (removeContainersCatchingErrors(docker, runningContainers)) {
            return;
        }

        log.warn("Couldn't shut down containers due to btrfs volume error, "
                + "see https://circleci.com/docs/docker-btrfs-error/ for more info.");

        log.info("Pruning networks");
        docker.pruneNetworks();
    }

    private static boolean removeContainersCatchingErrors(Docker docker, List runningContainers) throws IOException, InterruptedException {
        try {
            removeContainers(docker, runningContainers);
            return true;
        } catch (DockerExecutionException exception) {
            return false;
        }
    }

    private static void removeContainers(Docker docker, List running) throws IOException, InterruptedException {
        List rawContainerNames = running.stream()
                .map(ContainerName::rawName)
                .collect(toList());

        docker.rm(rawContainerNames);
        log.debug("Finished shutdown");
    }

}