/*
 * 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.dlab.backendapi.resources.gcp;

import com.epam.dlab.auth.UserInfo;
import com.epam.dlab.backendapi.core.Directories;
import com.epam.dlab.backendapi.core.FileHandlerCallback;
import com.epam.dlab.backendapi.core.commands.DockerAction;
import com.epam.dlab.backendapi.core.commands.DockerCommands;
import com.epam.dlab.backendapi.core.commands.RunDockerCommand;
import com.epam.dlab.backendapi.core.response.handlers.ComputationalCallbackHandler;
import com.epam.dlab.backendapi.core.response.handlers.ComputationalConfigure;
import com.epam.dlab.backendapi.service.impl.DockerService;
import com.epam.dlab.backendapi.service.impl.SparkClusterService;
import com.epam.dlab.dto.base.DataEngineType;
import com.epam.dlab.dto.base.computational.ComputationalBase;
import com.epam.dlab.dto.computational.ComputationalClusterConfigDTO;
import com.epam.dlab.dto.computational.ComputationalStartDTO;
import com.epam.dlab.dto.computational.ComputationalStopDTO;
import com.epam.dlab.dto.gcp.computational.ComputationalCreateGcp;
import com.epam.dlab.dto.gcp.computational.GcpComputationalTerminateDTO;
import com.epam.dlab.dto.gcp.computational.SparkComputationalCreateGcp;
import com.epam.dlab.exceptions.DlabException;
import com.epam.dlab.rest.contracts.ComputationalAPI;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.google.inject.Inject;
import io.dropwizard.auth.Auth;
import lombok.extern.slf4j.Slf4j;

import javax.ws.rs.Consumes;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

import static com.epam.dlab.backendapi.core.commands.DockerAction.CREATE;
import static com.epam.dlab.backendapi.core.commands.DockerAction.TERMINATE;


@Path("/")
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
@Slf4j
public class ComputationalResourceGcp extends DockerService implements DockerCommands {

	@Inject
	private ComputationalConfigure computationalConfigure;
	@Inject
	private SparkClusterService sparkClusterService;

	@POST
	@Path(ComputationalAPI.COMPUTATIONAL_CREATE_CLOUD_SPECIFIC)
	public String create(@Auth UserInfo ui, ComputationalCreateGcp dto) {
		log.debug("Create computational resources {} for user {}: {}", dto.getComputationalName(), ui.getName(), dto);
		String uuid = DockerCommands.generateUUID();
		folderListenerExecutor.start(configuration.getImagesDirectory(),
				configuration.getResourceStatusPollTimeout(),
				getFileHandlerCallback(CREATE, uuid, dto));
		try {
			commandExecutor.executeAsync(
					ui.getName(),
					uuid,
					commandBuilder.buildCommand(
							new RunDockerCommand()
									.withInteractive()
									.withName(nameContainer(dto.getEdgeUserName(), CREATE,
											dto.getExploratoryName(), dto.getComputationalName()))
									.withVolumeForRootKeys(configuration.getKeyDirectory())
									.withVolumeForResponse(configuration.getImagesDirectory())
									.withVolumeForLog(configuration.getDockerLogDirectory(), DataEngineType
											.CLOUD_SERVICE.getName())
									.withResource(DataEngineType.CLOUD_SERVICE.getName())
									.withRequestId(uuid)
									.withConfKeyName(configuration.getAdminKey())
									.withActionCreate(DataEngineType.getDockerImageName(DataEngineType.CLOUD_SERVICE)),
							dto
					)
			);
		} catch (Exception t) {
			throw new DlabException("Could not create computational resource cluster", t);
		}
		return uuid;
	}

	@POST
	@Path(ComputationalAPI.COMPUTATIONAL_TERMINATE_CLOUD_SPECIFIC)
	public String terminate(@Auth UserInfo ui, GcpComputationalTerminateDTO dto) {

		log.debug("Terminate computational resources {} for user {}: {}", dto.getComputationalName(), ui.getName(),
				dto);
		String uuid = DockerCommands.generateUUID();
		folderListenerExecutor.start(configuration.getImagesDirectory(),
				configuration.getResourceStatusPollTimeout(),
				getFileHandlerCallback(TERMINATE, uuid, dto));
		try {
			commandExecutor.executeAsync(
					ui.getName(),
					uuid,
					commandBuilder.buildCommand(
							new RunDockerCommand()
									.withInteractive()
									.withName(nameContainer(dto.getEdgeUserName(), TERMINATE,
											dto.getExploratoryName(), dto.getComputationalName()))
									.withVolumeForRootKeys(configuration.getKeyDirectory())
									.withVolumeForResponse(configuration.getImagesDirectory())
									.withVolumeForLog(configuration.getDockerLogDirectory(), DataEngineType
											.CLOUD_SERVICE.getName())
									.withResource(DataEngineType.CLOUD_SERVICE.getName())
									.withRequestId(uuid)
									.withConfKeyName(configuration.getAdminKey())
									.withActionTerminate(DataEngineType.getDockerImageName(DataEngineType
											.CLOUD_SERVICE)),
							dto
					)
			);
		} catch (JsonProcessingException t) {
			throw new DlabException("Could not terminate computational resources cluster", t);
		}

		return uuid;
	}

	@POST
	@Path(ComputationalAPI.COMPUTATIONAL_CREATE_SPARK)
	public String createSparkCluster(@Auth UserInfo ui, SparkComputationalCreateGcp dto) {
		log.debug("Create computational Spark resources {} for user {}: {}", dto.getComputationalName(), ui.getName(),
				dto);

		return sparkClusterService.create(ui, dto);
	}


	@POST
	@Path(ComputationalAPI.COMPUTATIONAL_TERMINATE_SPARK)
	public String terminateSparkCluster(@Auth UserInfo ui, GcpComputationalTerminateDTO dto) {
		log.debug("Terminate computational Spark resources {} for user {}: {}", dto.getComputationalName(), ui.getName
				(), dto);

		return sparkClusterService.terminate(ui, dto);
	}

	@POST
	@Path(ComputationalAPI.COMPUTATIONAL_STOP_SPARK)
	public String stopSparkCluster(@Auth UserInfo ui, ComputationalStopDTO dto) {
		log.debug("Stop computational Spark resources {} for user {}: {}",
				dto.getComputationalName(), ui.getName(), dto);

		return sparkClusterService.stop(ui, dto);
	}

	@POST
	@Path(ComputationalAPI.COMPUTATIONAL_START_SPARK)
	public String startSparkCluster(@Auth UserInfo ui, ComputationalStartDTO dto) {
		log.debug("Start computational Spark resource {} for user {}: {}",
				dto.getComputationalName(), ui.getName(), dto);

		return sparkClusterService.start(ui, dto);
	}

	@POST
	@Path(ComputationalAPI.COMPUTATIONAL_RECONFIGURE_SPARK)
	public String reconfigureSparkCluster(@Auth UserInfo ui, ComputationalClusterConfigDTO config) {
		log.debug("User is reconfiguring {} spark cluster for exploratory {}", ui.getName(),
				config.getComputationalName(), config.getNotebookInstanceName());
		return sparkClusterService.updateConfig(ui, config);
	}

	private FileHandlerCallback getFileHandlerCallback(DockerAction action, String uuid, ComputationalBase<?> dto) {
		return new ComputationalCallbackHandler(computationalConfigure, selfService, action, uuid, dto);
	}

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

	@Override
	public String getResourceType() {
		return Directories.DATA_ENGINE_SERVICE_LOG_DIRECTORY;
	}
}