/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 com.epam.datalab.backendapi.resources.base;


import com.epam.datalab.backendapi.ProvisioningServiceApplicationConfiguration;
import com.epam.datalab.backendapi.core.Directories;
import com.epam.datalab.backendapi.core.FileHandlerCallback;
import com.epam.datalab.backendapi.core.commands.CommandBuilder;
import com.epam.datalab.backendapi.core.commands.DockerAction;
import com.epam.datalab.backendapi.core.commands.DockerCommands;
import com.epam.datalab.backendapi.core.commands.ICommandExecutor;
import com.epam.datalab.backendapi.core.commands.RunDockerCommand;
import com.epam.datalab.backendapi.core.response.folderlistener.FolderListenerExecutor;
import com.epam.datalab.backendapi.core.response.handlers.ResourcesStatusCallbackHandler;
import com.epam.datalab.cloud.CloudProvider;
import com.epam.datalab.dto.UserEnvironmentResources;
import com.epam.datalab.dto.status.EnvResource;
import com.epam.datalab.exceptions.DatalabException;
import com.epam.datalab.process.model.ProcessInfo;
import com.epam.datalab.rest.client.RESTService;
import com.google.inject.Inject;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;

import java.util.Arrays;
import java.util.List;
import java.util.Objects;
import java.util.Optional;

import static com.epam.datalab.backendapi.core.commands.DockerAction.STATUS;
import static java.util.stream.Collectors.toList;

@Slf4j
public abstract class InfrastructureService implements DockerCommands {
    @Inject
    private RESTService selfService;
    @Inject
    private ProvisioningServiceApplicationConfiguration configuration;
    @Inject
    private FolderListenerExecutor folderListenerExecutor;
    @Inject
    private ICommandExecutor commandExecutor;
    @Inject
    private CommandBuilder commandBuilder;

    private static final String CONTAINER_NAME_REGEX_FORMAT = "%s_[^_\\W]+_%s(|_%s)_\\d+";

    public String action(String username, UserEnvironmentResources dto, String iamUser, DockerAction dockerAction) {
        log.trace("Request the status of resources for user {}: {}", username, dto);
        String uuid = DockerCommands.generateUUID();
        folderListenerExecutor.start(configuration.getImagesDirectory(),
                configuration.getRequestEnvStatusTimeout(),
                getFileHandlerCallback(dockerAction, uuid, iamUser));
        try {

            removeResourcesWithRunningContainers(username, dto);

            if (!(dto.getResourceList().getHostList().isEmpty() && dto.getResourceList().getClusterList().isEmpty())) {
                log.trace("Request the status of resources for user {} after filtering: {}", username, dto);
                RunDockerCommand runDockerCommand = new RunDockerCommand()
                        .withInteractive()
                        .withName(nameContainer(dto.getEdgeUserName(), STATUS, "resources"))
                        .withVolumeForRootKeys(configuration.getKeyDirectory())
                        .withVolumeForResponse(configuration.getImagesDirectory())
                        .withVolumeForLog(configuration.getDockerLogDirectory(), Directories.EDGE_LOG_DIRECTORY)
                        .withResource(getResourceType())
                        .withRequestId(uuid)
                        .withConfKeyName(configuration.getAdminKey())
                        .withActionStatus(configuration.getEdgeImage());
                if (configuration.getCloudProvider() == CloudProvider.AZURE &&
                        Objects.nonNull(configuration.getCloudConfiguration().getAzureAuthFile()) &&
                        !configuration.getCloudConfiguration().getAzureAuthFile().isEmpty()) {
                    runDockerCommand.withVolumeFoAzureAuthFile(configuration.getCloudConfiguration().getAzureAuthFile());
                }

                commandExecutor.executeAsync(username, uuid, commandBuilder.buildCommand(runDockerCommand, dto));
            } else {
                log.debug("Skipping calling status command. Resource lists are empty");
            }
        } catch (Exception e) {
            throw new DatalabException("Docker's command \"" + getResourceType() + "\" is fail: " + e.getLocalizedMessage
                    (), e);
        }
        return uuid;
    }

    private void removeResourcesWithRunningContainers(String username, UserEnvironmentResources dto)
            throws Exception {

        final ProcessInfo processInfo = commandExecutor.executeSync(username, DockerCommands.generateUUID(),
                String.format(DockerCommands
                        .GET_RUNNING_CONTAINERS_FOR_USER, dto.getEdgeUserName()));
        final String processInfoStdOut = processInfo.getStdOut();

        if (StringUtils.isNoneEmpty(processInfoStdOut)) {
            final List<String> runningContainerNames = Arrays.asList(processInfoStdOut.split("\n"));
            log.info("Running containers for users: {}", runningContainerNames);
            final List<EnvResource> hostList = filter(dto.getEdgeUserName(), runningContainerNames, dto
                    .getResourceList()
                    .getHostList());
            final List<EnvResource> clusterList = filter(dto.getEdgeUserName(), runningContainerNames, dto
                    .getResourceList()
                    .getClusterList());

            dto.getResourceList().setHostList(hostList);
            dto.getResourceList().setClusterList(clusterList);

        }
    }

    private List<EnvResource> filter(String username, List<String> runningContainerNames, List<EnvResource> hostList) {
        return hostList
                .stream()
                .filter(envResource -> hasNotCorrespondingRunningContainer(username, runningContainerNames,
                        envResource))
                .map(envResource -> new EnvResource().withId(envResource.getId()).withStatus(envResource.getStatus()))
                .collect(toList());
    }

    private boolean hasNotCorrespondingRunningContainer(String username, List<String> runningContainerNames,
                                                        EnvResource
                                                                envResource) {
        final String regex = String.format(CONTAINER_NAME_REGEX_FORMAT, username, envResource
                .getResourceType().name().toLowerCase(), Optional.ofNullable(envResource.getName()).orElse(""));
        return runningContainerNames.stream().noneMatch(container -> container.matches(regex));
    }

    protected FileHandlerCallback getFileHandlerCallback(DockerAction action, String uuid, String user) {
        return new ResourcesStatusCallbackHandler(selfService, action, uuid, user);
    }

    private String nameContainer(String user, DockerAction action, String name) {
        return nameContainer(user, action.toString(), name);
    }

    public String getResourceType() {
        return "status";
    }
}