/*
 * 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;

import com.epam.datalab.auth.UserInfo;
import com.epam.datalab.backendapi.resources.dto.ExploratoryActionFormDTO;
import com.epam.datalab.backendapi.resources.dto.ExploratoryCreateFormDTO;
import com.epam.datalab.backendapi.roles.RoleType;
import com.epam.datalab.backendapi.roles.UserRoles;
import com.epam.datalab.backendapi.service.ExploratoryService;
import com.epam.datalab.dto.aws.computational.ClusterConfig;
import com.epam.datalab.exceptions.DatalabException;
import com.epam.datalab.model.exploratory.Exploratory;
import com.epam.datalab.rest.contracts.ExploratoryAPI;
import com.google.inject.Inject;
import io.dropwizard.auth.Auth;
import lombok.extern.slf4j.Slf4j;

import javax.validation.Valid;
import javax.validation.constraints.NotNull;
import javax.ws.rs.*;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import java.util.List;

/**
 * Provides the REST API for the exploratory.
 */
@Path("/infrastructure_provision/exploratory_environment")
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
@Slf4j
public class ExploratoryResource implements ExploratoryAPI {

    private final ExploratoryService exploratoryService;

    @Inject
    public ExploratoryResource(ExploratoryService exploratoryService) {
        this.exploratoryService = exploratoryService;
    }

    @GET
    public Response getExploratoryPopUp(@Auth UserInfo userInfo) {
        return Response.ok(exploratoryService.getUserInstances(userInfo)).build();
    }

    /**
     * Creates the exploratory environment for user.
     *
     * @param userInfo user info.
     * @param formDTO  description for the exploratory environment.
     * @return {@link Response.Status#OK} request for provisioning service has been accepted.<br>
     * {@link Response.Status#FOUND} request for provisioning service has been duplicated.
     */
    @PUT
    public Response create(@Auth UserInfo userInfo,
                           @Valid @NotNull ExploratoryCreateFormDTO formDTO) {
        log.debug("Creating exploratory environment {} with name {} for user {}",
                formDTO.getImage(), formDTO.getName(), userInfo.getName());
        if (!UserRoles.checkAccess(userInfo, RoleType.EXPLORATORY, formDTO.getImage(), userInfo.getRoles())) {
            log.warn("Unauthorized attempt to create a {} by user {}", formDTO.getImage(), userInfo.getName());
            throw new DatalabException("You do not have the privileges to create a " + formDTO.getTemplateName());
        }
        String uuid = exploratoryService.create(userInfo, getExploratory(formDTO), formDTO.getProject(), formDTO.getName());
        return Response.ok(uuid).build();

    }


    /**
     * Starts exploratory environment for user.
     *
     * @param userInfo user info.
     * @param formDTO  description of exploratory action.
     * @return Invocation response as JSON string.
     */
    @POST
    public String start(@Auth UserInfo userInfo,
                        @Valid @NotNull ExploratoryActionFormDTO formDTO) {
        log.debug("Starting exploratory environment {} for user {}", formDTO.getNotebookInstanceName(),
                userInfo.getName());
        return exploratoryService.start(userInfo, formDTO.getNotebookInstanceName(), formDTO.getProjectName(), null);
    }

    /**
     * Stops exploratory environment for user.
     *
     * @param userInfo user info.
     * @param name     name of exploratory environment.
     * @return Invocation response as JSON string.
     */
    @DELETE
    @Path("/{project}/{name}/stop")
    public String stop(@Auth UserInfo userInfo,
                       @PathParam("project") String project,
                       @PathParam("name") String name) {
        log.debug("Stopping exploratory environment {} for user {}", name, userInfo.getName());
        return exploratoryService.stop(userInfo, userInfo.getName(), project, name, null);
    }

    /**
     * Terminates exploratory environment for user.
     *
     * @param userInfo user info.
     * @param name     name of exploratory environment.
     * @return Invocation response as JSON string.
     */
    @DELETE
    @Path("/{project}/{name}/terminate")
    public String terminate(@Auth UserInfo userInfo,
                            @PathParam("project") String project,
                            @PathParam("name") String name) {
        log.debug("Terminating exploratory environment {} for user {}", name, userInfo.getName());
        return exploratoryService.terminate(userInfo, userInfo.getName(), project, name, null);
    }

    @PUT
    @Path("/{project}/{name}/reconfigure")
    public Response reconfigureSpark(@Auth UserInfo userInfo,
                                     @PathParam("project") String project,
                                     @PathParam("name") String name,
                                     List<ClusterConfig> config) {
        log.debug("Updating exploratory {} spark cluster for user {}", name, userInfo.getName());
        exploratoryService.updateClusterConfig(userInfo, project, name, config);
        return Response.ok().build();
    }

    @GET
    @Path("/{project}/{name}/cluster/config")
    public Response getClusterConfig(@Auth UserInfo userInfo,
                                     @PathParam("project") String project,
                                     @PathParam("name") String name) {
        log.debug("Getting exploratory {} spark cluster configuration for user {}", name, userInfo.getName());
        return Response.ok(exploratoryService.getClusterConfig(userInfo, project, name)).build();
    }

    private Exploratory getExploratory(ExploratoryCreateFormDTO formDTO) {
        return Exploratory.builder()
                .name(formDTO.getName())
                .dockerImage(formDTO.getImage())
                .imageName((formDTO.getImageName() == null || formDTO.getImageName().isEmpty())
                        ? formDTO.getVersion() : formDTO.getImageName())
                .templateName(formDTO.getTemplateName())
                .version(formDTO.getVersion())
                .clusterConfig(formDTO.getClusterConfig())
                .shape(formDTO.getShape())
                .endpoint(formDTO.getEndpoint())
                .project(formDTO.getProject())
                .exploratoryTag(formDTO.getExploratoryTag())
                .gpuType(formDTO.getGpuType())
                .gpuCount(formDTO.getGpuCount())
                .enabledGPU(formDTO.getEnabledGPU())
                .build();
    }
}