/*-
 * ============LICENSE_START=======================================================
 * SDC
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * 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.
 * ============LICENSE_END=========================================================
 */

package org.openecomp.sdc.be.components.impl;

import fj.data.Either;
import org.openecomp.sdc.be.config.BeEcompErrorManager;
import org.openecomp.sdc.be.dao.api.ActionStatus;
import org.openecomp.sdc.be.datatypes.enums.NodeTypeEnum;
import org.openecomp.sdc.be.model.DataTypeDefinition;
import org.openecomp.sdc.be.model.PropertyDefinition;
import org.openecomp.sdc.be.model.Resource;
import org.openecomp.sdc.be.model.User;
import org.openecomp.sdc.be.model.operations.api.StorageOperationStatus;
import org.openecomp.sdc.be.model.operations.utils.ComponentValidationUtils;
import org.openecomp.sdc.exception.ResponseFormat;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

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

/**
 * This class holds the business logic relevant for attributes manipulation.
 * 
 * @author mshitrit
 *
 */
@Component("attributeBusinessLogic")
public class AttributeBusinessLogic extends BaseBusinessLogic {

    private static final String CREATE_ATTRIBUTE = "CreateAttribute";
    private static final String UPDATE_ATTRIBUTE = "UpdateAttribute";
    private static final String DELETE_ATTRIBUTE = "DeleteAttribute";

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

    /**
     * Created attribute on the resource with resourceId
     *
     * @param resourceId
     * @param newAttributeDef
     * @param userId
     * @return AttributeDefinition if created successfully Or ResponseFormat
     */
    public Either<PropertyDefinition, ResponseFormat> createAttribute(String resourceId, PropertyDefinition newAttributeDef, String userId) {
        Either<PropertyDefinition, ResponseFormat> result = null;
        Either<User, ResponseFormat> resp = validateUserExists(userId, "create Attribute", false);
        if (resp.isRight()) {
            return Either.right(resp.right().value());
        }

        StorageOperationStatus lockResult = graphLockOperation.lockComponent(resourceId, NodeTypeEnum.Resource);
        if (lockResult != StorageOperationStatus.OK) {
            BeEcompErrorManager.getInstance().logBeFailedLockObjectError(CREATE_ATTRIBUTE, NodeTypeEnum.Resource.name().toLowerCase(), resourceId);
            log.info("Failed to lock component {}. Error - {}", resourceId, lockResult);
            return Either.right(componentsUtils.getResponseFormat(ActionStatus.GENERAL_ERROR));
        }

        try {
            // Get the resource from DB
            Either<Resource, StorageOperationStatus> status = toscaOperationFacade.getToscaElement(resourceId);
            if (status.isRight()) {
                return Either.right(componentsUtils.getResponseFormat(ActionStatus.RESOURCE_NOT_FOUND, ""));
            }
            Resource resource = status.left().value();

            // verify that resource is checked-out and the user is the last updater
            if (!ComponentValidationUtils.canWorkOnResource(resource, userId)) {
                return Either.right(componentsUtils.getResponseFormat(ActionStatus.RESTRICTED_OPERATION));
            }

            // verify attribute does not exist in resource
            if (isAttributeExist(resource.getAttributes(), resourceId, newAttributeDef.getName())) {
                return Either.right(componentsUtils.getResponseFormat(ActionStatus.ATTRIBUTE_ALREADY_EXIST, newAttributeDef.getName()));
            }
            Either<Map<String, DataTypeDefinition>, ResponseFormat> eitherAllDataTypes = getAllDataTypes(applicationDataTypeCache);
            if (eitherAllDataTypes.isRight()) {
                return Either.right(eitherAllDataTypes.right().value());
            }
            // validate property default values
            Either<Boolean, ResponseFormat> defaultValuesValidation = validatePropertyDefaultValue(newAttributeDef, eitherAllDataTypes.left().value());
            if (defaultValuesValidation.isRight()) {
                return Either.right(defaultValuesValidation.right().value());
            }

            handleDefaultValue(newAttributeDef, eitherAllDataTypes.left().value());

            // add the new attribute to resource on graph
            // need to get StorageOpaerationStatus and convert to ActionStatus from
            // componentsUtils
            Either<PropertyDefinition, StorageOperationStatus> either = toscaOperationFacade.addAttributeOfResource(resource, newAttributeDef);
            if (either.isRight()) {
                result = Either.right(componentsUtils.getResponseFormat(componentsUtils.convertFromStorageResponse(either.right().value()), resource.getName()));
                return result;
            }
            result = Either.left(either.left().value());

            return result;
        } finally {
            commitOrRollback(result);
            graphLockOperation.unlockComponent(resourceId, NodeTypeEnum.Resource);
        }

    }

    private boolean isAttributeExist(List<PropertyDefinition> attributes, String resourceUid, String propertyName) {
        boolean isExist = false;
        if (attributes != null) {
            isExist = attributes.stream().filter(p -> Objects.equals(p.getName(), propertyName) && Objects.equals(p.getParentUniqueId(), resourceUid)).findAny().isPresent();
        }
        return isExist;

    }

    /**
     * @param resourceId
     * @param attributeId
     * @param userId
     * @return
     */
    public Either<PropertyDefinition, ResponseFormat> getAttribute(String resourceId, String attributeId, String userId) {

        Either<User, ResponseFormat> resp = validateUserExists(userId, "get Attribute", false);
        if (resp.isRight()) {
            return Either.right(resp.right().value());
        }

        // Get the resource from DB
        Either<Resource, StorageOperationStatus> status = toscaOperationFacade.getToscaElement(resourceId);
        if (status.isRight()) {
            return Either.right(componentsUtils.getResponseFormat(ActionStatus.RESOURCE_NOT_FOUND, ""));
        }
        Resource resource = status.left().value();

        List<PropertyDefinition> attributes = resource.getAttributes();
        if (attributes == null) {
            return Either.right(componentsUtils.getResponseFormat(ActionStatus.ATTRIBUTE_NOT_FOUND, ""));
        } else {
            Either<PropertyDefinition, ResponseFormat> result;
            // verify attribute exist in resource
            Optional<PropertyDefinition> optionalAtt = attributes.stream().filter(att -> att.getUniqueId().equals(attributeId) && att.getParentUniqueId().equals(resourceId)).findAny();

            if (optionalAtt.isPresent()) {
                result = Either.left(optionalAtt.get());
            } else {
                result = Either.right(componentsUtils.getResponseFormat(ActionStatus.ATTRIBUTE_NOT_FOUND, ""));
            }
            return result;
        }

    }

    /**
     * Updates Attribute on resource
     *
     * @param resourceId
     * @param attributeId
     * @param newAttDef
     * @param userId
     * @return
     */
    public Either<PropertyDefinition, ResponseFormat> updateAttribute(String resourceId, String attributeId, PropertyDefinition newAttDef, String userId) {
        Either<PropertyDefinition, ResponseFormat> result = null;

        StorageOperationStatus lockResult = graphLockOperation.lockComponent(resourceId, NodeTypeEnum.Resource);
        if (lockResult != StorageOperationStatus.OK) {
            BeEcompErrorManager.getInstance().logBeFailedLockObjectError(UPDATE_ATTRIBUTE, NodeTypeEnum.Resource.name().toLowerCase(), resourceId);
            log.info("Failed to lock component {}. Error - {}", resourceId, lockResult);
            return Either.right(componentsUtils.getResponseFormat(ActionStatus.GENERAL_ERROR));
        }
        try {
            // Get the resource from DB
            Either<Resource, StorageOperationStatus> eitherResource = toscaOperationFacade.getToscaElement(resourceId);
            if (eitherResource.isRight()) {
                return Either.right(componentsUtils.getResponseFormat(ActionStatus.RESOURCE_NOT_FOUND, ""));
            }
            Resource resource = eitherResource.left().value();

            // verify that resource is checked-out and the user is the last updater
            if (!ComponentValidationUtils.canWorkOnResource(resource, userId)) {
                return Either.right(componentsUtils.getResponseFormat(ActionStatus.RESTRICTED_OPERATION));
            }

            // verify attribute exist in resource
            Either<PropertyDefinition, ResponseFormat> eitherAttribute = getAttribute(resourceId, attributeId, userId);
            if (eitherAttribute.isRight()) {
                return Either.right(eitherAttribute.right().value());
            }
            Either<Map<String, DataTypeDefinition>, ResponseFormat> eitherAllDataTypes = getAllDataTypes(applicationDataTypeCache);
            if (eitherAllDataTypes.isRight()) {
                return Either.right(eitherAllDataTypes.right().value());
            }

            // validate attribute default values
            Either<Boolean, ResponseFormat> defaultValuesValidation = validatePropertyDefaultValue(newAttDef, eitherAllDataTypes.left().value());
            if (defaultValuesValidation.isRight()) {
                return Either.right(defaultValuesValidation.right().value());
            }
            // add the new property to resource on graph

            StorageOperationStatus validateAndUpdateAttribute = propertyOperation.validateAndUpdateProperty(newAttDef, eitherAllDataTypes.left().value());
            if (validateAndUpdateAttribute != StorageOperationStatus.OK) {
                log.debug("Problem while updating attribute with id {}. Reason - {}", attributeId, validateAndUpdateAttribute);
                result = Either.right(componentsUtils.getResponseFormatByResource(componentsUtils.convertFromStorageResponse(validateAndUpdateAttribute), resource.getName()));
            }


            Either<PropertyDefinition, StorageOperationStatus> eitherAttUpdate = toscaOperationFacade.updateAttributeOfResource(resource, newAttDef);

            if (eitherAttUpdate.isRight()) {
                log.debug("Problem while updating attribute with id {}. Reason - {}", attributeId, eitherAttUpdate.right().value());
                result = Either.right(componentsUtils.getResponseFormatByResource(componentsUtils.convertFromStorageResponse(eitherAttUpdate.right().value()), resource.getName()));
                return result;
            }

            result = Either.left(eitherAttUpdate.left().value());
            return result;
        } finally {
            commitOrRollback(result);
            graphLockOperation.unlockComponent(resourceId, NodeTypeEnum.Resource);
        }

    }

    /**
     * Deletes Attribute on resource
     *
     * @param resourceId
     * @param attributeId
     * @param userId
     * @return
     */
    public Either<PropertyDefinition, ResponseFormat> deleteAttribute(String resourceId, String attributeId, String userId) {

        Either<PropertyDefinition, ResponseFormat> result = null;

        Either<User, ResponseFormat> resp = validateUserExists(userId, "delete Attribute", false);
        if (resp.isRight()) {
            return Either.right(resp.right().value());
        }

        StorageOperationStatus lockResult = graphLockOperation.lockComponent(resourceId, NodeTypeEnum.Resource);
        if (lockResult != StorageOperationStatus.OK) {
            BeEcompErrorManager.getInstance().logBeFailedLockObjectError(DELETE_ATTRIBUTE, NodeTypeEnum.Resource.name().toLowerCase(), resourceId);
            log.info("Failed to lock component {}. Error - {}", resourceId, lockResult);
            return Either.right(componentsUtils.getResponseFormat(ActionStatus.GENERAL_ERROR));
        }

        try {
            // Get the resource from DB
            Either<Resource, StorageOperationStatus> eitherResource = toscaOperationFacade.getToscaElement(resourceId);
            if (eitherResource.isRight()) {
                return Either.right(componentsUtils.getResponseFormat(ActionStatus.RESOURCE_NOT_FOUND, ""));
            }
            Resource resource = eitherResource.left().value();

            // verify that resource is checked-out and the user is the last updater
            if (!ComponentValidationUtils.canWorkOnResource(resource, userId)) {
                return Either.right(componentsUtils.getResponseFormat(ActionStatus.RESTRICTED_OPERATION));
            }

            // verify attribute exist in resource
            Either<PropertyDefinition, ResponseFormat> eitherAttributeExist = getAttribute(resourceId, attributeId, userId);
            if (eitherAttributeExist.isRight()) {
                return Either.right(eitherAttributeExist.right().value());
            }
            String attributeName = eitherAttributeExist.left().value().getName();

            // delete attribute of resource from graph
            StorageOperationStatus eitherAttributeDelete = toscaOperationFacade.deleteAttributeOfResource(resource, attributeName);
            if (eitherAttributeDelete != StorageOperationStatus.OK) {
                result = Either.right(componentsUtils.getResponseFormat(componentsUtils.convertFromStorageResponse(eitherAttributeDelete), resource.getName()));
                return result;
            }

            result = Either.left(eitherAttributeExist.left().value());
            return result;
        } finally {
            commitOrRollback(result);
            graphLockOperation.unlockComponent(resourceId, NodeTypeEnum.Resource);
        }
    }
}