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/*
 * ============LICENSE_START=======================================================
 *  Copyright (C) 2020 Nordix Foundation
 *  ================================================================================
 *  Licensed 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.
 *
 *  SPDX-License-Identifier: Apache-2.0
 *  ============LICENSE_END=========================================================
 */

package org.openecomp.sdc.be.servlets;

import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.Parameter;
import io.swagger.v3.oas.annotations.media.ArraySchema;
import io.swagger.v3.oas.annotations.media.Content;
import io.swagger.v3.oas.annotations.media.Schema;
import io.swagger.v3.oas.annotations.responses.ApiResponse;
import java.util.List;
import java.util.Optional;
import javax.inject.Inject;
import javax.inject.Singleton;
import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.Consumes;
import javax.ws.rs.DELETE;
import javax.ws.rs.HeaderParam;
import javax.ws.rs.POST;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import org.apache.commons.collections.CollectionUtils;
import org.openecomp.sdc.be.components.impl.ComponentInstanceBusinessLogic;
import org.openecomp.sdc.be.components.impl.ComponentSubstitutionFilterBusinessLogic;
import org.openecomp.sdc.be.components.impl.ResourceImportManager;
import org.openecomp.sdc.be.components.impl.aaf.AafPermission;
import org.openecomp.sdc.be.components.impl.aaf.PermissionAllowed;
import org.openecomp.sdc.be.components.impl.utils.NodeFilterConstraintAction;
import org.openecomp.sdc.be.config.BeEcompErrorManager;
import org.openecomp.sdc.be.dao.api.ActionStatus;
import org.openecomp.sdc.be.datamodel.utils.ConstraintConvertor;
import org.openecomp.sdc.be.datatypes.elements.SubstitutionFilterDataDefinition;
import org.openecomp.sdc.be.datatypes.enums.ComponentTypeEnum;
import org.openecomp.sdc.be.impl.ComponentsUtils;
import org.openecomp.sdc.be.impl.ServletUtils;
import org.openecomp.sdc.be.model.User;
import org.openecomp.sdc.be.tosca.utils.SubstitutionFilterConverter;
import org.openecomp.sdc.be.ui.model.UIConstraint;
import org.openecomp.sdc.be.ui.model.UINodeFilter;
import org.openecomp.sdc.be.user.UserBusinessLogic;
import org.openecomp.sdc.common.api.Constants;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Path("/v1/catalog/{componentType}/{componentId}/resourceInstances/{componentInstanceId}/substitutionFilter")
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
@Singleton
public class ComponentSubstitutionFilterServlet extends AbstractValidationsServlet {

    private static final Logger LOGGER = LoggerFactory.getLogger(ComponentSubstitutionFilterServlet.class);
    private static final String START_HANDLE_REQUEST_OF = "Start handle {} request of {}";
    private static final String MODIFIER_ID_IS = "Modifier id is {}";
    private static final String FAILED_TO_PARSE_COMPONENT = "Failed to parse component";

    private static final String FAILED_TO_ADD_SUBSTITUTION_FILTER = "Failed to add substitution filter";
    private static final String ADD_SUBSTITUTION_FILTER = "Add Substitution Filter";
    private static final String ADD_SUBSTITUTION_FILTER_WITH_AN_ERROR = "Add substitution filter with an error";

    private static final String FAILED_TO_UPDATE_SUBSTITUTION_FILTER = "Failed to update substitution filter";
    private static final String SUBSTITUTION_FILTER_UPDATE = "Substitution Filter Update";
    private static final String UPDATE_SUBSTITUTION_FILTER_WITH_AN_ERROR = "Update substitution filter with an error {}";

    private static final String FAILED_TO_DELETE_SUBSTITUTION_FILTER = "Failed to delete substitution filter";
    private static final String SUBSTITUTION_FILTER_DELETE = "Substitution Filter Delete";
    private static final String DELETE_SUBSTITUTION_FILTER_WITH_AN_ERROR = "Delete substitution filter with an error";

    private final ComponentSubstitutionFilterBusinessLogic componentSubstitutionFilterBusinessLogic;

    @Inject
    public ComponentSubstitutionFilterServlet(final UserBusinessLogic userBusinessLogic,
                                              final ComponentInstanceBusinessLogic componentInstanceBL,
                                              final ComponentsUtils componentsUtils,
                                              final ServletUtils servletUtils,
                                              final ResourceImportManager resourceImportManager,
                                              final ComponentSubstitutionFilterBusinessLogic componentSubstitutionFilterBusinessLogic) {
        super(userBusinessLogic, componentInstanceBL, componentsUtils, servletUtils, resourceImportManager);
        this.componentSubstitutionFilterBusinessLogic = componentSubstitutionFilterBusinessLogic;
    }

    @POST
    @Consumes(MediaType.APPLICATION_JSON)
    @Produces(MediaType.APPLICATION_JSON)
    @Path("/")
    @Operation(description = "Add Component Substitution Filter Constraint", method = "POST",
        summary = "Add Component Substitution Filter Constraint", responses = {
        @ApiResponse(content = @Content(array = @ArraySchema(schema = @Schema(implementation = Response.class)))),
        @ApiResponse(responseCode = "201", description = "Add Substitution Filter Constraint"),
        @ApiResponse(responseCode = "403", description = "Restricted operation"),
        @ApiResponse(responseCode = "400", description = "Invalid content / Missing content")})
    @PermissionAllowed(AafPermission.PermNames.INTERNAL_ALL_VALUE)
    public Response addSubstitutionFilter(
        @Parameter(description = "UIConstraint data", required = true) String constraintData,
        @Parameter(description = "Component Id") @PathParam("componentId") String componentId,
        @Parameter(description = "Component Instance Id") @PathParam("componentInstanceId") String componentInstanceId,
        @Parameter(description = "valid value: services",
            schema = @Schema(allowableValues = {
                ComponentTypeEnum.SERVICE_PARAM_NAME})) @PathParam("componentType") final String componentType,
        @Context final HttpServletRequest request,
        @HeaderParam(value = Constants.USER_ID_HEADER) String userId) {

        LOGGER.debug(START_HANDLE_REQUEST_OF, request.getMethod(), request.getRequestURI());
        LOGGER.debug(MODIFIER_ID_IS, userId);
        final User userModifier = componentSubstitutionFilterBusinessLogic.validateUser(userId);

        final ComponentTypeEnum componentTypeEnum = ComponentTypeEnum.findByParamName(componentType);
        try {
            final Optional<UIConstraint> convertResponse = componentsUtils
                .parseToConstraint(constraintData, userModifier, componentTypeEnum);
            if (!convertResponse.isPresent()) {
                LOGGER.error(FAILED_TO_PARSE_COMPONENT);
                return buildErrorResponse(getComponentsUtils().getResponseFormat(ActionStatus.GENERAL_ERROR));
            }

            final Optional<SubstitutionFilterDataDefinition> substitutionFilter =
                componentSubstitutionFilterBusinessLogic.createSubstitutionFilterIfNotExist(componentId,
                    componentInstanceId, true, componentTypeEnum);
            if (!substitutionFilter.isPresent()) {
                LOGGER.error("Failed to create substitution filter.");
                BeEcompErrorManager.getInstance().logBeRestApiGeneralError(ADD_SUBSTITUTION_FILTER);
                return buildErrorResponse(getComponentsUtils().getResponseFormat(ActionStatus.GENERAL_ERROR));
            }

            final UIConstraint uiConstraint = convertResponse.get();
            final String constraint = new ConstraintConvertor().convert(uiConstraint);

            final Optional<SubstitutionFilterDataDefinition> actionResponse = componentSubstitutionFilterBusinessLogic
                .addSubstitutionFilter(componentId.toLowerCase(), componentInstanceId, NodeFilterConstraintAction.ADD,
                    uiConstraint.getServicePropertyName(), constraint, true, componentTypeEnum);

            if (!actionResponse.isPresent()) {
                LOGGER.error(FAILED_TO_ADD_SUBSTITUTION_FILTER);
                return buildErrorResponse(getComponentsUtils().getResponseFormat(ActionStatus.GENERAL_ERROR));
            }
            final UINodeFilter uiFilter = new SubstitutionFilterConverter().convertToUi(actionResponse.get());

            return buildOkResponse(getComponentsUtils().getResponseFormat(ActionStatus.OK), uiFilter);

        } catch (final Exception e) {
            BeEcompErrorManager.getInstance().logBeRestApiGeneralError(ADD_SUBSTITUTION_FILTER);
            LOGGER.error(ADD_SUBSTITUTION_FILTER_WITH_AN_ERROR, e);
            return buildErrorResponse(getComponentsUtils().getResponseFormat(ActionStatus.GENERAL_ERROR));
        }
    }

    @PUT
    @Consumes(MediaType.APPLICATION_JSON)
    @Produces(MediaType.APPLICATION_JSON)
    @Path("/")
    @Operation(description = "Update Component Substitution Filter Constraint", method = "PUT",
        summary = "Update Component Substitution Filter Constraint", responses = {
        @ApiResponse(content = @Content(array = @ArraySchema(schema = @Schema(implementation = Response.class)))),
        @ApiResponse(responseCode = "201", description = "Update Substitution Filter Constraint"),
        @ApiResponse(responseCode = "403", description = "Restricted operation"),
        @ApiResponse(responseCode = "400", description = "Invalid content / Missing content")})
    @PermissionAllowed(AafPermission.PermNames.INTERNAL_ALL_VALUE)
    public Response updateSubstitutionFilter(
        @Parameter(description = "UIConstraint data", required = true) String constraintData,
        @Parameter(description = "Component Id") @PathParam("componentId") String componentId,
        @Parameter(description = "Component Instance Id") @PathParam("componentInstanceId") String componentInstanceId,
        @Parameter(description = "valid value: services",
            schema = @Schema(allowableValues = {
                ComponentTypeEnum.SERVICE_PARAM_NAME})) @PathParam("componentType") final String componentType,
        @Context final HttpServletRequest request, @HeaderParam(value = Constants.USER_ID_HEADER) String userId) {

        LOGGER.debug(START_HANDLE_REQUEST_OF, request.getMethod(), request.getRequestURI());
        LOGGER.debug(MODIFIER_ID_IS, userId);
        final User userModifier = componentSubstitutionFilterBusinessLogic.validateUser(userId);

        try {
            final ComponentTypeEnum componentTypeEnum = ComponentTypeEnum.findByParamName(componentType);
            final List<UIConstraint>  uiConstraints = componentsUtils
                .validateAndParseConstraint(componentTypeEnum, constraintData, userModifier);
            if (CollectionUtils.isEmpty(uiConstraints)) {
                LOGGER.error("Failed to Parse Constraint data {} when executing {} ",
                    constraintData, SUBSTITUTION_FILTER_UPDATE);
                return buildErrorResponse(componentsUtils.getResponseFormat(ActionStatus.GENERAL_ERROR,
                    "Failed to parse constraint data"));
            }

            final List<String> constraints = new ConstraintConvertor().convertToList(uiConstraints);
            final Optional<SubstitutionFilterDataDefinition> actionResponse = componentSubstitutionFilterBusinessLogic
                .updateSubstitutionFilter(componentId.toLowerCase(), componentInstanceId, constraints,
                    true, componentTypeEnum);

            if (!actionResponse.isPresent()) {
                LOGGER.error(FAILED_TO_UPDATE_SUBSTITUTION_FILTER);
                return buildErrorResponse(getComponentsUtils().getResponseFormat(ActionStatus.GENERAL_ERROR));
            }

            return buildOkResponse(getComponentsUtils().getResponseFormat(ActionStatus.OK),
                new SubstitutionFilterConverter().convertToUi(actionResponse.get()));

        } catch (final Exception e) {
            BeEcompErrorManager.getInstance().logBeRestApiGeneralError(SUBSTITUTION_FILTER_UPDATE);
            LOGGER.error(UPDATE_SUBSTITUTION_FILTER_WITH_AN_ERROR, e.getMessage(), e);
            return buildErrorResponse(getComponentsUtils().getResponseFormat(ActionStatus.GENERAL_ERROR));
        }
    }

    @DELETE
    @Consumes(MediaType.APPLICATION_JSON)
    @Produces(MediaType.APPLICATION_JSON)
    @Path("/{constraintIndex}")
    @Operation(description = "Delete Component Substitution Filter Constraint", method = "Delete",
        summary = "Delete Component Substitution Filter Constraint", responses = {
        @ApiResponse(content = @Content(array = @ArraySchema(schema = @Schema(implementation = Response.class)))),
        @ApiResponse(responseCode = "201", description = "Delete Substitution Filter Constraint"),
        @ApiResponse(responseCode = "403", description = "Restricted operation"),
        @ApiResponse(responseCode = "400", description = "Invalid content / Missing content")})
    @PermissionAllowed(AafPermission.PermNames.INTERNAL_ALL_VALUE)
    public Response deleteSubstitutionFilterConstraint(
        @Parameter(description = "Component Id") @PathParam("componentId") String componentId,
        @Parameter(description = "Component Instance Id") @PathParam("componentInstanceId") String componentInstanceId,
        @Parameter(description = "Constraint Index") @PathParam("constraintIndex") int index,
        @Parameter(description = "valid value: services",
            schema = @Schema(allowableValues = {
                ComponentTypeEnum.SERVICE_PARAM_NAME})) @PathParam("componentType") final String componentType,
        @Context final HttpServletRequest request, @HeaderParam(value = Constants.USER_ID_HEADER) String userId) {

        LOGGER.debug(START_HANDLE_REQUEST_OF, request.getMethod(), request.getRequestURI());
        LOGGER.debug(MODIFIER_ID_IS, userId);
        componentSubstitutionFilterBusinessLogic.validateUser(userId);

        try {
            final Optional<SubstitutionFilterDataDefinition> actionResponse = componentSubstitutionFilterBusinessLogic
                .deleteSubstitutionFilter(componentId.toLowerCase(), componentInstanceId,
                    NodeFilterConstraintAction.DELETE,
                    null, index, true, ComponentTypeEnum.findByParamName(componentType));

            if (!actionResponse.isPresent()) {
                LOGGER.debug(FAILED_TO_DELETE_SUBSTITUTION_FILTER);
                return buildErrorResponse(getComponentsUtils().getResponseFormat(ActionStatus.GENERAL_ERROR));
            }

            return buildOkResponse(getComponentsUtils().getResponseFormat(ActionStatus.OK),
                new SubstitutionFilterConverter().convertToUi(actionResponse.get()));

        } catch (final Exception e) {
            BeEcompErrorManager.getInstance().logBeRestApiGeneralError(SUBSTITUTION_FILTER_DELETE);
            LOGGER.debug(DELETE_SUBSTITUTION_FILTER_WITH_AN_ERROR, e);
            return buildErrorResponse(getComponentsUtils().getResponseFormat(ActionStatus.GENERAL_ERROR));

        }
    }

}