/*-
* ============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.tosca;

import static org.openecomp.sdc.be.tosca.utils.InterfacesOperationsToscaUtil.addInterfaceDefinitionElement;
import static org.openecomp.sdc.be.tosca.utils.InterfacesOperationsToscaUtil.addInterfaceTypeElement;

import fj.data.Either;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang3.tuple.ImmutablePair;
import org.apache.commons.lang3.tuple.ImmutableTriple;
import org.apache.commons.lang3.tuple.Triple;
import org.openecomp.sdc.be.components.impl.exceptions.SdcResourceNotFoundException;
import org.openecomp.sdc.be.config.ConfigurationManager;
import org.openecomp.sdc.be.dao.titan.TitanOperationStatus;
import org.openecomp.sdc.be.datatypes.components.ResourceMetadataDataDefinition;
import org.openecomp.sdc.be.datatypes.enums.ComponentTypeEnum;
import org.openecomp.sdc.be.datatypes.enums.OriginTypeEnum;
import org.openecomp.sdc.be.datatypes.enums.ResourceTypeEnum;
import org.openecomp.sdc.be.model.ArtifactDefinition;
import org.openecomp.sdc.be.model.CapabilityDefinition;
import org.openecomp.sdc.be.model.Component;
import org.openecomp.sdc.be.model.ComponentInstance;
import org.openecomp.sdc.be.model.ComponentInstanceInput;
import org.openecomp.sdc.be.model.ComponentInstanceProperty;
import org.openecomp.sdc.be.model.ComponentParametersView;
import org.openecomp.sdc.be.model.DataTypeDefinition;
import org.openecomp.sdc.be.model.GroupInstance;
import org.openecomp.sdc.be.model.InputDefinition;
import org.openecomp.sdc.be.model.PropertyDefinition;
import org.openecomp.sdc.be.model.RelationshipInfo;
import org.openecomp.sdc.be.model.RequirementCapabilityRelDef;
import org.openecomp.sdc.be.model.RequirementDefinition;
import org.openecomp.sdc.be.model.Resource;
import org.openecomp.sdc.be.model.Service;
import org.openecomp.sdc.be.model.cache.ApplicationDataTypeCache;
import org.openecomp.sdc.be.model.category.CategoryDefinition;
import org.openecomp.sdc.be.model.jsontitan.operations.ToscaOperationFacade;
import org.openecomp.sdc.be.model.jsontitan.utils.ModelConverter;
import org.openecomp.sdc.be.model.operations.api.StorageOperationStatus;
import org.openecomp.sdc.be.tosca.model.SubstitutionMapping;
import org.openecomp.sdc.be.tosca.model.ToscaCapability;
import org.openecomp.sdc.be.tosca.model.ToscaGroupTemplate;
import org.openecomp.sdc.be.tosca.model.ToscaMetadata;
import org.openecomp.sdc.be.tosca.model.ToscaNodeTemplate;
import org.openecomp.sdc.be.tosca.model.ToscaNodeType;
import org.openecomp.sdc.be.tosca.model.ToscaPolicyTemplate;
import org.openecomp.sdc.be.tosca.model.ToscaProperty;
import org.openecomp.sdc.be.tosca.model.ToscaTemplate;
import org.openecomp.sdc.be.tosca.model.ToscaTemplateRequirement;
import org.openecomp.sdc.be.tosca.model.ToscaTopolgyTemplate;
import org.openecomp.sdc.be.tosca.utils.ForwardingPathToscaUtil;
import org.openecomp.sdc.be.tosca.utils.InputConverter;
import org.openecomp.sdc.common.log.wrappers.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.yaml.snakeyaml.DumperOptions;
import org.yaml.snakeyaml.DumperOptions.FlowStyle;
import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.introspector.BeanAccess;
import org.yaml.snakeyaml.introspector.Property;
import org.yaml.snakeyaml.introspector.PropertyUtils;
import org.yaml.snakeyaml.nodes.MappingNode;
import org.yaml.snakeyaml.nodes.Node;
import org.yaml.snakeyaml.nodes.NodeTuple;
import org.yaml.snakeyaml.nodes.Tag;
import org.yaml.snakeyaml.representer.Represent;
import org.yaml.snakeyaml.representer.Representer;

import java.beans.IntrospectionException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Optional;
import java.util.Set;
import java.util.function.Supplier;
import java.util.stream.Collectors;

import static org.apache.commons.collections.CollectionUtils.isEmpty;
import static org.apache.commons.collections.CollectionUtils.isNotEmpty;
import static org.apache.commons.collections.MapUtils.isNotEmpty;
import static org.apache.commons.lang.StringUtils.isNotEmpty;

@org.springframework.stereotype.Component("tosca-export-handler")
public class ToscaExportHandler {

    private ApplicationDataTypeCache dataTypeCache;
    private ToscaOperationFacade toscaOperationFacade;  
    private CapabilityRequirementConverter capabilityRequirementConverter;
    private PolicyExportParser policyExportParser;
    private GroupExportParser groupExportParser;
    private PropertyConvertor propertyConvertor;
    private InputConverter inputConverter;

    @Autowired 
    public ToscaExportHandler(ApplicationDataTypeCache dataTypeCache, ToscaOperationFacade toscaOperationFacade,
                              CapabilityRequirementConverter capabilityRequirementConverter, PolicyExportParser policyExportParser,
                              GroupExportParser groupExportParser, InputConverter inputConverter) {
            this.dataTypeCache = dataTypeCache;
            this.toscaOperationFacade = toscaOperationFacade;
            this.capabilityRequirementConverter = capabilityRequirementConverter;
            this.policyExportParser = policyExportParser;
            this.groupExportParser = groupExportParser;
            this.propertyConvertor = PropertyConvertor.getInstance();
            this.inputConverter =  inputConverter;
      }


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

    public static final String TOSCA_VERSION = "tosca_simple_yaml_1_1";
    private static final String SERVICE_NODE_TYPE_PREFIX = "org.openecomp.service.";
    private static final String IMPORTS_FILE_KEY = "file";
    private static final String TOSCA_INTERFACE_NAME = "-interface.yml";
    public static final String ASSET_TOSCA_TEMPLATE = "assettoscatemplate";
    private static final String FAILED_TO_GET_DEFAULT_IMPORTS_CONFIGURATION = "convertToToscaTemplate - failed to get Default Imports section from configuration";
    private static final String NOT_SUPPORTED_COMPONENT_TYPE = "Not supported component type {}";
    private static final List<Map<String, Map<String, String>>> DEFAULT_IMPORTS = ConfigurationManager
            .getConfigurationManager().getConfiguration().getDefaultImports();

    public Either<ToscaRepresentation, ToscaError> exportComponent(Component component) {

        Either<ToscaTemplate, ToscaError> toscaTemplateRes = convertToToscaTemplate(component);
        if (toscaTemplateRes.isRight()) {
            return Either.right(toscaTemplateRes.right().value());
        }

        ToscaTemplate toscaTemplate = toscaTemplateRes.left().value();
        ToscaRepresentation toscaRepresentation = this.createToscaRepresentation(toscaTemplate);
        return Either.left(toscaRepresentation);
    }

    public Either<ToscaRepresentation, ToscaError> exportComponentInterface(Component component) {
        if (null == DEFAULT_IMPORTS) {
            log.debug(FAILED_TO_GET_DEFAULT_IMPORTS_CONFIGURATION);
            return Either.right(ToscaError.GENERAL_ERROR);
        }

        ToscaTemplate toscaTemplate = new ToscaTemplate(TOSCA_VERSION);
        toscaTemplate.setImports(new ArrayList<>(DEFAULT_IMPORTS));
        Map<String, ToscaNodeType> nodeTypes = new HashMap<>();
        Either<ToscaTemplate, ToscaError> toscaTemplateRes = convertInterfaceNodeType(new HashMap<>(), component, toscaTemplate,
                nodeTypes);
        if (toscaTemplateRes.isRight()) {
            return Either.right(toscaTemplateRes.right().value());
        }

        toscaTemplate = toscaTemplateRes.left().value();
        ToscaRepresentation toscaRepresentation = this.createToscaRepresentation(toscaTemplate);
        return Either.left(toscaRepresentation);
    }

    public ToscaRepresentation createToscaRepresentation(ToscaTemplate toscaTemplate) {
        CustomRepresenter representer = new CustomRepresenter();
        DumperOptions options = new DumperOptions();
        options.setAllowReadOnlyProperties(false);
        options.setPrettyFlow(true);

        options.setDefaultFlowStyle(FlowStyle.FLOW);
        options.setCanonical(false);

        representer.addClassTag(toscaTemplate.getClass(), Tag.MAP);

        representer.setPropertyUtils(new UnsortedPropertyUtils());
        Yaml yaml = new Yaml(representer, options);

        String yamlAsString = yaml.dumpAsMap(toscaTemplate);

        StringBuilder sb = new StringBuilder();
        sb.append(ConfigurationManager.getConfigurationManager().getConfiguration().getHeatEnvArtifactHeader());
        sb.append(yamlAsString);
        sb.append(ConfigurationManager.getConfigurationManager().getConfiguration().getHeatEnvArtifactFooter());

        ToscaRepresentation toscaRepresentation = new ToscaRepresentation();
        toscaRepresentation.setMainYaml(sb.toString());
        toscaRepresentation.setDependencies(toscaTemplate.getDependencies());

        return toscaRepresentation;
    }

    public Either<ToscaTemplate, ToscaError> getDependencies(Component component) {
        ToscaTemplate toscaTemplate = new ToscaTemplate(null);
        Either<ImmutablePair<ToscaTemplate, Map<String, Component>>, ToscaError> fillImports = fillImports(component,
                toscaTemplate);
        if (fillImports.isRight()) {
            return Either.right(fillImports.right().value());
        }
        return Either.left(fillImports.left().value().left);
    }

    private Either<ToscaTemplate, ToscaError> convertToToscaTemplate(Component component) {
        if (null == DEFAULT_IMPORTS) {
            log.debug(FAILED_TO_GET_DEFAULT_IMPORTS_CONFIGURATION);
            return Either.right(ToscaError.GENERAL_ERROR);
        }

        log.trace("start tosca export for {}", component.getUniqueId());
        ToscaTemplate toscaTemplate = new ToscaTemplate(TOSCA_VERSION);

        toscaTemplate.setMetadata(convertMetadata(component));
        toscaTemplate.setImports(new ArrayList<>(DEFAULT_IMPORTS));
        Map<String, ToscaNodeType> nodeTypes = new HashMap<>();
        if (ModelConverter.isAtomicComponent(component)) {
            log.trace("convert component as node type");
            return convertNodeType(new HashMap<>(), component, toscaTemplate, nodeTypes);
        } else {
            log.trace("convert component as topology template");
            return convertToscaTemplate(component, toscaTemplate);
        }

    }

    private Either<ToscaTemplate, ToscaError> convertToscaTemplate(Component component, ToscaTemplate toscaNode) {

        Either<ImmutablePair<ToscaTemplate, Map<String, Component>>, ToscaError> importsRes = fillImports(component,
                toscaNode);
        if (importsRes.isRight()) {
            return Either.right(importsRes.right().value());
        }
        toscaNode = importsRes.left().value().left;
        Map<String, Component> componentCache = importsRes.left().value().right;
        Either<Map<String, ToscaNodeType>, ToscaError> nodeTypesMapEither = createProxyNodeTypes(componentCache , component );
        if (nodeTypesMapEither.isRight()) {
            log.debug("Failed to fetch normative service proxy resource by tosca name, error {}",
                    nodeTypesMapEither.right().value());
            return Either.right(nodeTypesMapEither.right().value());
        }
        Map<String, ToscaNodeType> nodeTypesMap = nodeTypesMapEither.left().value();
        if (nodeTypesMap != null && !nodeTypesMap.isEmpty()) {
            toscaNode.setNode_types(nodeTypesMap);
        }


        Either<Map<String, DataTypeDefinition>, TitanOperationStatus> dataTypesEither = dataTypeCache.getAll();
        if (dataTypesEither.isRight()) {
            log.debug("Failed to retrieve all data types {}", dataTypesEither.right().value());
            return Either.right(ToscaError.GENERAL_ERROR);
        }
        Map<String, DataTypeDefinition> dataTypes = dataTypesEither.left().value();
        ToscaTopolgyTemplate topologyTemplate = new ToscaTopolgyTemplate();
        List<InputDefinition> inputDef = component.getInputs();
        Map<String, ToscaProperty> inputs = inputConverter.convertInputs(inputDef, dataTypes);

        if (!inputs.isEmpty()) {
            topologyTemplate.setInputs(inputs);
        }

        List<ComponentInstance> componentInstances = component.getComponentInstances();
        Map<String, List<ComponentInstanceProperty>> componentInstancesProperties = component
                .getComponentInstancesProperties();
        if (componentInstances != null && !componentInstances.isEmpty()) {

            Either<Map<String, ToscaNodeTemplate>, ToscaError> nodeTemplates = convertNodeTemplates(component,
                    componentInstances, componentInstancesProperties, componentCache, dataTypes, topologyTemplate);
            if (nodeTemplates.isRight()) {
                return Either.right(nodeTemplates.right().value());
            }
            log.debug("node templates converted");

            topologyTemplate.setNode_templates(nodeTemplates.left().value());
        }
        
        
        addGroupsToTopologyTemplate(component, topologyTemplate);
            
        try {
             addPoliciesToTopologyTemplate(component, topologyTemplate);
            } catch (SdcResourceNotFoundException e) {
                  log.debug("Fail to add policies to topology template:",e);
                  Either.right(ToscaError.GENERAL_ERROR);
            }
            
            
        SubstitutionMapping substitutionMapping = new SubstitutionMapping();
        String toscaResourceName;
        switch (component.getComponentType()) {
        case RESOURCE:
            toscaResourceName = ((ResourceMetadataDataDefinition) component.getComponentMetadataDefinition()
                    .getMetadataDataDefinition()).getToscaResourceName();
            break;
        case SERVICE:
            toscaResourceName = SERVICE_NODE_TYPE_PREFIX
                    + component.getComponentMetadataDefinition().getMetadataDataDefinition().getSystemName();
            break;
        default:
            log.debug(NOT_SUPPORTED_COMPONENT_TYPE, component.getComponentType());
            return Either.right(ToscaError.NOT_SUPPORTED_TOSCA_TYPE);
        }
        substitutionMapping.setNode_type(toscaResourceName);

        Either<SubstitutionMapping, ToscaError> capabilities = convertCapabilities(component, substitutionMapping, componentCache);
        if (capabilities.isRight()) {
            return Either.right(capabilities.right().value());
        }
        substitutionMapping = capabilities.left().value();

        Either<SubstitutionMapping, ToscaError> requirements = capabilityRequirementConverter
                .convertSubstitutionMappingRequirements(componentCache, component, substitutionMapping);
        if (requirements.isRight()) {
            return Either.right(requirements.right().value());
        }
        substitutionMapping = requirements.left().value();

        topologyTemplate.setSubstitution_mappings(substitutionMapping);

        toscaNode.setTopology_template(topologyTemplate);
        return Either.left(toscaNode);
    }

      private void addGroupsToTopologyTemplate(Component component, ToscaTopolgyTemplate topologyTemplate) {
            
            
            Map<String, ToscaGroupTemplate> groups = groupExportParser.getGroups(component);
            if(groups!= null) {
                  topologyTemplate.addGroups(groups);
            }
      }

      private void addPoliciesToTopologyTemplate(Component component, ToscaTopolgyTemplate topologyTemplate)
                  throws SdcResourceNotFoundException {
            Map<String, ToscaPolicyTemplate> policies = policyExportParser.getPolicies(component);
            if(policies!= null) {
                  topologyTemplate.addPolicies(policies);
            }
      }

    private ToscaMetadata convertMetadata(Component component) {
        return convertMetadata(component, false, null);
    }

    private ToscaMetadata convertMetadata(Component component, boolean isInstance,
            ComponentInstance componentInstance) {
        ToscaMetadata toscaMetadata = new ToscaMetadata();
        toscaMetadata.setInvariantUUID(component.getInvariantUUID());
        toscaMetadata.setUUID(component.getUUID());
        toscaMetadata.setDescription(component.getDescription());
        toscaMetadata.setName(component.getComponentMetadataDefinition().getMetadataDataDefinition().getName());

        List<CategoryDefinition> categories = component.getCategories();
        CategoryDefinition categoryDefinition = categories.get(0);
        toscaMetadata.setCategory(categoryDefinition.getName());

        if (isInstance) {
            toscaMetadata.setVersion(component.getVersion());
            toscaMetadata.setCustomizationUUID(componentInstance.getCustomizationUUID());
            if (componentInstance.getSourceModelInvariant() != null
                    && !componentInstance.getSourceModelInvariant().isEmpty()) {
                toscaMetadata.setVersion(componentInstance.getComponentVersion());
                toscaMetadata.setSourceModelInvariant(componentInstance.getSourceModelInvariant());
                toscaMetadata.setSourceModelUuid(componentInstance.getSourceModelUuid());
                toscaMetadata.setSourceModelName(componentInstance.getSourceModelName());
                toscaMetadata.setName(
                        componentInstance.getSourceModelName() + " " + OriginTypeEnum.ServiceProxy.getDisplayValue());
                toscaMetadata.setDescription(componentInstance.getDescription());
            }

        }
        switch (component.getComponentType()) {
        case RESOURCE:
            Resource resource = (Resource) component;

            if (isInstance && componentInstance.getOriginType() == OriginTypeEnum.ServiceProxy) {
                toscaMetadata.setType(componentInstance.getOriginType().getDisplayValue());
            } else {
                toscaMetadata.setType(resource.getResourceType().name());
            }
            toscaMetadata.setSubcategory(categoryDefinition.getSubcategories().get(0).getName());
            toscaMetadata.setResourceVendor(resource.getVendorName());
            toscaMetadata.setResourceVendorRelease(resource.getVendorRelease());
            toscaMetadata.setResourceVendorModelNumber(resource.getResourceVendorModelNumber());
            break;
        case SERVICE:
            Service service = (Service) component;
            toscaMetadata.setType(component.getComponentType().getValue());
            toscaMetadata.setServiceType(service.getServiceType());
            toscaMetadata.setServiceRole(service.getServiceRole());
            toscaMetadata.setEnvironmentContext(service.getEnvironmentContext());
            resolveInstantiationTypeAndSetItToToscaMetaData(toscaMetadata, service);
            if (!isInstance) {
                // DE268546
                toscaMetadata.setServiceEcompNaming(((Service) component).isEcompGeneratedNaming());
                toscaMetadata.setEcompGeneratedNaming(((Service) component).isEcompGeneratedNaming());
                toscaMetadata.setNamingPolicy(((Service) component).getNamingPolicy());
            }
            break;
        default:
            log.debug(NOT_SUPPORTED_COMPONENT_TYPE, component.getComponentType());
        }
        return toscaMetadata;
    }

      private void resolveInstantiationTypeAndSetItToToscaMetaData(ToscaMetadata toscaMetadata, Service service) {
            if (service.getInstantiationType() != null) {
                        toscaMetadata.setInstantiationType(service.getInstantiationType());
            }
            else {
                        toscaMetadata.setInstantiationType(StringUtils.EMPTY);
            }
      }

    private Either<ImmutablePair<ToscaTemplate, Map<String, Component>>, ToscaError> fillImports(Component component,
            ToscaTemplate toscaTemplate) {

        if (null == DEFAULT_IMPORTS) {
            log.debug(FAILED_TO_GET_DEFAULT_IMPORTS_CONFIGURATION);
            return Either.right(ToscaError.GENERAL_ERROR);
        }
        Map<String, Component> componentCache = new HashMap<>();

        if (!ModelConverter.isAtomicComponent(component)) {
            List<ComponentInstance> componentInstances = component.getComponentInstances();
            if (componentInstances != null && !componentInstances.isEmpty()) {

                List<Map<String, Map<String, String>>> additionalImports = toscaTemplate.getImports() == null
                        ? new ArrayList<>(DEFAULT_IMPORTS) : new ArrayList<>(toscaTemplate.getImports());

                List<Triple<String, String, Component>> dependecies = new ArrayList<>();

                Map<String, ArtifactDefinition> toscaArtifacts = component.getToscaArtifacts();
                ArtifactDefinition artifactDefinition = toscaArtifacts.get(ToscaExportHandler.ASSET_TOSCA_TEMPLATE);

                Map<String, Map<String, String>> importsListMember = new HashMap<>();
                Map<String, String> interfaceFiles = new HashMap<>();
                interfaceFiles.put(IMPORTS_FILE_KEY, getInterfaceFilename(artifactDefinition.getArtifactName()));
                StringBuilder keyNameBuilder = new StringBuilder();
                keyNameBuilder.append(component.getComponentType().toString().toLowerCase());
                keyNameBuilder.append("-");
                keyNameBuilder.append(component.getName());
                keyNameBuilder.append("-interface");
                importsListMember.put(keyNameBuilder.toString(), interfaceFiles);
                additionalImports.add(importsListMember);

                componentInstances.forEach(ci -> createDependency(componentCache, additionalImports, dependecies, ci));
                toscaTemplate.setDependencies(dependecies);
                toscaTemplate.setImports(additionalImports);
            }
        } else {
            log.debug("currently imports supported for VF and service only");
        }
        return Either.left(new ImmutablePair<>(toscaTemplate, componentCache));
    }

    private void createDependency(Map<String, Component> componentCache, List<Map<String, Map<String, String>>> imports,
            List<Triple<String, String, Component>> dependecies, ComponentInstance ci) {
        Map<String, String> files = new HashMap<>();
        Map<String, Map<String, String>> importsListMember = new HashMap<>();
        StringBuilder keyNameBuilder;

        Component componentRI = componentCache.get(ci.getComponentUid());
        if (componentRI == null) {
            // all resource must be only once!
            Either<Component, StorageOperationStatus> resource = toscaOperationFacade
                    .getToscaFullElement(ci.getComponentUid());
            if ((resource.isRight()) && (log.isDebugEnabled())) {
                log.debug("Failed to fetch resource with id {} for instance {}",ci.getComponentUid() ,ci.getUniqueId());
                return ;
            }

            Component fetchedComponent = resource.left().value();
            componentCache.put(fetchedComponent.getUniqueId(), fetchedComponent);

            if (ci.getOriginType() == OriginTypeEnum.ServiceProxy){
                Either<Component, StorageOperationStatus> sourceService = toscaOperationFacade
                        .getToscaFullElement(ci.getSourceModelUid());
                if (sourceService.isRight() && (log.isDebugEnabled())) {
                    log.debug("Failed to fetch source service with id {} for proxy {}", ci.getSourceModelUid(), ci.getUniqueId());
                }
                Component fetchedSource = sourceService.left().value();
                componentCache.put(fetchedSource.getUniqueId(), fetchedSource);
            }

            componentRI = fetchedComponent;

            Map<String, ArtifactDefinition> toscaArtifacts = componentRI.getToscaArtifacts();
            ArtifactDefinition artifactDefinition = toscaArtifacts.get(ASSET_TOSCA_TEMPLATE);
            if (artifactDefinition != null) {
                String artifactName = artifactDefinition.getArtifactName();
                files.put(IMPORTS_FILE_KEY, artifactName);
                keyNameBuilder = new StringBuilder();
                keyNameBuilder.append(fetchedComponent.getComponentType().toString().toLowerCase());
                keyNameBuilder.append("-");
                keyNameBuilder.append(ci.getComponentName());
                importsListMember.put(keyNameBuilder.toString(), files);
                imports.add(importsListMember);
                dependecies.add(new ImmutableTriple<>(artifactName,
                        artifactDefinition.getEsId(), fetchedComponent));

                if (!ModelConverter.isAtomicComponent(componentRI)) {
                    importsListMember = new HashMap<>();
                    Map<String, String> interfaceFiles = new HashMap<>();
                    interfaceFiles.put(IMPORTS_FILE_KEY, getInterfaceFilename(artifactName));
                    keyNameBuilder.append("-interface");
                    importsListMember.put(keyNameBuilder.toString(), interfaceFiles);
                    imports.add(importsListMember);
                }
            }
        }
    }

    public static String getInterfaceFilename(String artifactName) {
        return artifactName.substring(0, artifactName.lastIndexOf('.')) + ToscaExportHandler.TOSCA_INTERFACE_NAME;
    }

    private Either<ToscaTemplate, ToscaError> convertNodeType(Map<String, Component> componentsCache, Component component, ToscaTemplate toscaNode,
            Map<String, ToscaNodeType> nodeTypes) {
        log.debug("start convert node type for {}", component.getUniqueId());
        ToscaNodeType toscaNodeType = createNodeType(component);

        Either<Map<String, DataTypeDefinition>, TitanOperationStatus> dataTypesEither = dataTypeCache.getAll();
        if (dataTypesEither.isRight()) {
            log.debug("Failed to fetch all data types :", dataTypesEither.right().value());
            return Either.right(ToscaError.GENERAL_ERROR);
        }

        Map<String, DataTypeDefinition> dataTypes = dataTypesEither.left().value();
        Either<ToscaNodeType, ToscaError> properties = propertyConvertor.convertProperties(component, toscaNodeType,
                dataTypes);
        if (properties.isRight()) {
            return Either.right(properties.right().value());
        }
        toscaNodeType = properties.left().value();
        log.debug("Properties converted for {}", component.getUniqueId());

        // Extracted to method for code reuse
        return convertReqCapAndTypeName(componentsCache, component, toscaNode, nodeTypes, toscaNodeType, dataTypes);
    }

    private Either<ToscaTemplate, ToscaError> convertInterfaceNodeType(Map<String, Component> componentsCache, Component component, ToscaTemplate toscaNode,
            Map<String, ToscaNodeType> nodeTypes) {
        log.debug("start convert node type for {}", component.getUniqueId());
        ToscaNodeType toscaNodeType = createNodeType(component);

        Either<Map<String, DataTypeDefinition>, TitanOperationStatus> dataTypesEither = dataTypeCache.getAll();
        if (dataTypesEither.isRight()) {
            log.debug("Failed to fetch all data types :", dataTypesEither.right().value());
            return Either.right(ToscaError.GENERAL_ERROR);
        }

        Map<String, DataTypeDefinition> dataTypes = dataTypesEither.left().value();

        List<InputDefinition> inputDef = component.getInputs();
        Map<String, ToscaProperty> inputs = new HashMap<>();

        if (inputDef != null) {
            inputDef.forEach(i -> {
                ToscaProperty property = propertyConvertor.convertProperty(dataTypes, i, false);
                inputs.put(i.getName(), property);
            });
            if (!inputs.isEmpty()) {
                toscaNodeType.setProperties(inputs);
                addInterfaceDefinitionElement(component, toscaNodeType);
            }
        }
        return convertReqCapAndTypeName(componentsCache, component, toscaNode, nodeTypes, toscaNodeType, dataTypes);
    }

    private Either<ToscaTemplate, ToscaError> convertReqCapAndTypeName(Map<String, Component> componentsCache, Component component, ToscaTemplate toscaNode,
            Map<String, ToscaNodeType> nodeTypes, ToscaNodeType toscaNodeType,
            Map<String, DataTypeDefinition> dataTypes) {
        Either<ToscaNodeType, ToscaError> capabilities = convertCapabilities(componentsCache, component, toscaNodeType, dataTypes);
        if (capabilities.isRight()) {
            return Either.right(capabilities.right().value());
        }
        toscaNodeType = capabilities.left().value();
        log.debug("Capabilities converted for {}", component.getUniqueId());

        Either<ToscaNodeType, ToscaError> requirements = capabilityRequirementConverter.convertRequirements(componentsCache, component,
                toscaNodeType);
        if (requirements.isRight()) {
            return Either.right(requirements.right().value());
        }
        toscaNodeType = requirements.left().value();
        log.debug("Requirements converted for {}", component.getUniqueId());

        String toscaResourceName;
        switch (component.getComponentType()) {
        case RESOURCE:
            toscaResourceName = ((ResourceMetadataDataDefinition) component.getComponentMetadataDefinition()
                    .getMetadataDataDefinition()).getToscaResourceName();
            break;
        case SERVICE:
            toscaResourceName = SERVICE_NODE_TYPE_PREFIX
                    + component.getComponentMetadataDefinition().getMetadataDataDefinition().getSystemName();
            break;
        default:
            log.debug(NOT_SUPPORTED_COMPONENT_TYPE, component.getComponentType());
            return Either.right(ToscaError.NOT_SUPPORTED_TOSCA_TYPE);
        }

        nodeTypes.put(toscaResourceName, toscaNodeType);
        toscaNode.setNode_types(nodeTypes);
        log.debug("finish convert node type for {}", component.getUniqueId());
        return Either.left(toscaNode);
    }

    private Either<Map<String, ToscaNodeTemplate>, ToscaError> convertNodeTemplates(Component component,
            List<ComponentInstance> componentInstances,
            Map<String, List<ComponentInstanceProperty>> componentInstancesProperties,
            Map<String, Component> componentCache, Map<String, DataTypeDefinition> dataTypes,
            ToscaTopolgyTemplate topologyTemplate) {

        Either<Map<String, ToscaNodeTemplate>, ToscaError> convertNodeTemplatesRes = null;
        log.debug("start convert topology template for {} for type {}", component.getUniqueId(),
                component.getComponentType());
        Map<String, ToscaNodeTemplate> nodeTemplates = new HashMap<>();
        Map<String, List<ComponentInstanceInput>> componentInstancesInputs = component.getComponentInstancesInputs();

        Map<String, ToscaGroupTemplate> groupsMap = null;
        for (ComponentInstance componentInstance : componentInstances) {
            ToscaNodeTemplate nodeTemplate = new ToscaNodeTemplate();
            nodeTemplate.setType(componentInstance.getToscaComponentName());

            Either<Component, Boolean> originComponentRes = capabilityRequirementConverter
                    .getOriginComponent(componentCache, componentInstance);
            if (originComponentRes.isRight()) {
                convertNodeTemplatesRes = Either.right(ToscaError.NODE_TYPE_REQUIREMENT_ERROR);
                break;
            }
            Either<ToscaNodeTemplate, ToscaError> requirements = convertComponentInstanceRequirements(component,
                    componentInstance, component.getComponentInstancesRelations(), nodeTemplate,
                    originComponentRes.left().value(), componentCache);
            if (requirements.isRight()) {
                convertNodeTemplatesRes = Either.right(requirements.right().value());
                break;
            }
            String instanceUniqueId = componentInstance.getUniqueId();
            log.debug("Component instance Requirements converted for instance {}", instanceUniqueId);

            nodeTemplate = requirements.left().value();

            Component originalComponent = componentCache.get(componentInstance.getActualComponentUid());

            if (componentInstance.getOriginType() == OriginTypeEnum.ServiceProxy){
                Component componentOfProxy = componentCache.get(componentInstance.getComponentUid());
                nodeTemplate.setMetadata(convertMetadata(componentOfProxy, true, componentInstance));
            } else {
                nodeTemplate.setMetadata(convertMetadata(originalComponent, true, componentInstance));
            }

            Either<ToscaNodeTemplate, ToscaError> capabilities = capabilityRequirementConverter
                    .convertComponentInstanceCapabilities(componentInstance, dataTypes, nodeTemplate);
            if (capabilities.isRight()) {
                convertNodeTemplatesRes = Either.right(capabilities.right().value());
                break;
            }
            log.debug("Component instance Capabilities converted for instance {}", instanceUniqueId);

            nodeTemplate = capabilities.left().value();
            Map<String, Object> props = new HashMap<>();

            if (originalComponent.getComponentType() == ComponentTypeEnum.RESOURCE) {
                // Adds the properties of parent component to map
                addPropertiesOfParentComponent(dataTypes, originalComponent, props);
            }

            if (null != componentInstancesProperties && componentInstancesProperties.containsKey(instanceUniqueId)) {
                addPropertiesOfComponentInstance(componentInstancesProperties, dataTypes,
                        instanceUniqueId, props);
            }

            if (componentInstancesInputs != null && componentInstancesInputs.containsKey(instanceUniqueId)) {
                addComponentInstanceInputs(dataTypes, componentInstancesInputs, instanceUniqueId,
                        props);
            }
            if (!props.isEmpty()) {
                nodeTemplate.setProperties(props);
            }

            List<GroupInstance> groupInstances = componentInstance.getGroupInstances();
            if (groupInstances != null) {
                if (groupsMap == null) {
                    groupsMap = new HashMap<>();
                }
                for (GroupInstance groupInst : groupInstances) {
                    boolean addToTosca = true;

                    List<String> artifacts = groupInst.getArtifacts();
                    if (artifacts == null || artifacts.isEmpty()) {
                        addToTosca = false;
                    }

                    if (addToTosca) {
                        ToscaGroupTemplate toscaGroup = groupExportParser.getToscaGroupTemplate(groupInst, componentInstance.getInvariantName());
                        groupsMap.put(groupInst.getName(), toscaGroup);
                    }
                }
            }

            nodeTemplates.put(componentInstance.getName(), nodeTemplate);
        }
        if (groupsMap != null) {
            log.debug("instance groups added");
            topologyTemplate.addGroups(groupsMap);
        }
        if (component.getComponentType() == ComponentTypeEnum.SERVICE && isNotEmpty(((Service) component).getForwardingPaths())) {
            log.debug("Starting converting paths for component {}, name {}", component.getUniqueId(),
                    component.getName());
            ForwardingPathToscaUtil.addForwardingPaths((Service) component, nodeTemplates, capabilityRequirementConverter, componentCache, toscaOperationFacade);
            log.debug("Finished converting paths for component {}, name {}", component.getUniqueId(),
                    component.getName());
        }
        if (convertNodeTemplatesRes == null) {
            convertNodeTemplatesRes = Either.left(nodeTemplates);
        }
        log.debug("finish convert topology template for {} for type {}", component.getUniqueId(),
                component.getComponentType());
        return convertNodeTemplatesRes;
    }

    private void addComponentInstanceInputs(Map<String, DataTypeDefinition> dataTypes,
                                            Map<String, List<ComponentInstanceInput>> componentInstancesInputs,
                                            String instanceUniqueId, Map<String, Object> props) {

        List<ComponentInstanceInput> instanceInputsList = componentInstancesInputs.get(instanceUniqueId);
        if (instanceInputsList != null) {
            instanceInputsList.forEach(input -> {

                Supplier<String> supplier = () -> input.getValue() != null && !input.getValue().isEmpty()
                        ? input.getValue() : input.getDefaultValue();
                        propertyConvertor.convertAndAddValue(dataTypes, props, input, supplier);
            });
        }
    }

    private void addPropertiesOfComponentInstance(
            Map<String, List<ComponentInstanceProperty>> componentInstancesProperties,
            Map<String, DataTypeDefinition> dataTypes, String instanceUniqueId,
            Map<String, Object> props) {

        if (isNotEmpty(componentInstancesProperties)) {
            componentInstancesProperties.get(instanceUniqueId)
                    // Converts and adds each value to property map
                    .forEach(prop -> propertyConvertor.convertAndAddValue(dataTypes, props, prop,
                            prop::getValue));
        }
    }

    private void addPropertiesOfParentComponent(Map<String, DataTypeDefinition> dataTypes,
                                                Component componentOfInstance, Map<String, Object> props) {

        List<PropertyDefinition> componentProperties = ((Resource) componentOfInstance).getProperties();
        if (isNotEmpty(componentProperties)) {
            componentProperties.stream()
                    // Filters out properties with empty default values
                    .filter(prop -> isNotEmpty(prop.getDefaultValue()))
                    // Converts and adds each value to property map
                    .forEach(prop -> propertyConvertor.convertAndAddValue(dataTypes, props, prop,
                            prop::getDefaultValue));
        }
    }

    private ToscaNodeType createNodeType(Component component) {
        ToscaNodeType toscaNodeType = new ToscaNodeType();
        if (ModelConverter.isAtomicComponent(component)) {
            if (((Resource) component).getDerivedFrom() != null) {
                toscaNodeType.setDerived_from(((Resource) component).getDerivedFrom().get(0));
            }
            toscaNodeType.setDescription(component.getDescription());
        } else {
            String derivedFrom = null != component.getDerivedFromGenericType() ? component.getDerivedFromGenericType()
                    : "tosca.nodes.Root";
            toscaNodeType.setDerived_from(derivedFrom);
        }
        return toscaNodeType;
    }

    private Either<Map<String, ToscaNodeType>, ToscaError> createProxyNodeTypes(Map<String, Component> componentCache ,Component container  ) {

        Map<String, ToscaNodeType> nodeTypesMap = new HashMap<>();
        Either<Map<String, ToscaNodeType>, ToscaError> res = Either.left(nodeTypesMap);

        List<ComponentInstance> componentInstances = container.getComponentInstances();

        if (componentInstances == null || componentInstances.isEmpty()) {
            return res;
        }
        Map<String, ComponentInstance> serviceProxyInstanceList = new HashMap<>();
        List<ComponentInstance> proxyInst = componentInstances.stream()
                .filter(p -> p.getOriginType().name().equals(OriginTypeEnum.ServiceProxy.name()))
                .collect(Collectors.toList());
        if (proxyInst != null && !proxyInst.isEmpty()) {
            for (ComponentInstance inst : proxyInst) {
                serviceProxyInstanceList.put(inst.getToscaComponentName(), inst);
            }
        }

        if (serviceProxyInstanceList.isEmpty()) {
            return res;
        }
        ComponentParametersView filter = new ComponentParametersView(true);
        filter.setIgnoreCapabilities(false);
        filter.setIgnoreComponentInstances(false);
        Either<Resource, StorageOperationStatus> serviceProxyOrigin = toscaOperationFacade
                .getLatestByName("serviceProxy");
        if (serviceProxyOrigin.isRight()) {
            log.debug("Failed to fetch normative service proxy resource by tosca name, error {}",
                    serviceProxyOrigin.right().value());
            return Either.right(ToscaError.NOT_SUPPORTED_TOSCA_TYPE);
        }
        Component origComponent = serviceProxyOrigin.left().value();

        for (Entry<String, ComponentInstance> entryProxy : serviceProxyInstanceList.entrySet()) {
            Component serviceComponent = null;
            ComponentParametersView componentParametersView = new ComponentParametersView();
            componentParametersView.disableAll();
            componentParametersView.setIgnoreCategories(false);
            Either<Component, StorageOperationStatus> service = toscaOperationFacade
                    .getToscaElement(entryProxy.getValue().getSourceModelUid(), componentParametersView);
            if (service.isRight()) {
                log.debug("Failed to fetch resource with id {} for instance {}", entryProxy.getValue().getSourceModelUid(),  entryProxy.getValue().getName());
            } else {
                serviceComponent = service.left().value();
            }

            ToscaNodeType toscaNodeType = createProxyNodeType(componentCache , origComponent, serviceComponent, entryProxy.getValue());
            nodeTypesMap.put(entryProxy.getKey(), toscaNodeType);
        }

        return Either.left(nodeTypesMap);
    }

    private ToscaNodeType createProxyNodeType(Map<String, Component> componentCache , Component origComponent, Component proxyComponent,
            ComponentInstance instance) {
        ToscaNodeType toscaNodeType = new ToscaNodeType();
        String derivedFrom = ((Resource) origComponent).getToscaResourceName();

        toscaNodeType.setDerived_from(derivedFrom);
        Either<Map<String, DataTypeDefinition>, TitanOperationStatus> dataTypesEither = dataTypeCache.getAll();
        if (dataTypesEither.isRight()) {
            log.debug("Failed to retrieve all data types {}", dataTypesEither.right().value());
        }
        Map<String, DataTypeDefinition> dataTypes = dataTypesEither.left().value();
        Map<String, ToscaCapability> capabilities = this.capabilityRequirementConverter
                .convertProxyCapabilities( componentCache ,origComponent, proxyComponent, instance, dataTypes);

        toscaNodeType.setCapabilities(capabilities);

        return toscaNodeType;
    }

    private Either<ToscaNodeTemplate, ToscaError> convertComponentInstanceRequirements(Component component,
            ComponentInstance componentInstance, List<RequirementCapabilityRelDef> relations,
            ToscaNodeTemplate nodeTypeTemplate, Component originComponent, Map<String, Component> componentCache) {

        List<Map<String, ToscaTemplateRequirement>> toscaRequirements = new ArrayList<>();
        if (!addRequirements(component, componentInstance, relations, originComponent, toscaRequirements, componentCache)) {
            log.debug("Failed to convert component instance requirements for the component instance {}. ",
                    componentInstance.getName());
            return Either.right(ToscaError.NODE_TYPE_REQUIREMENT_ERROR);
        }
        if (!toscaRequirements.isEmpty()) {
            nodeTypeTemplate.setRequirements(toscaRequirements);
        }
        log.debug("Finished to convert requirements for the node type {} ", componentInstance.getName());
        return Either.left(nodeTypeTemplate);
    }

    private boolean addRequirements(Component component, ComponentInstance componentInstance,
            List<RequirementCapabilityRelDef> relations, Component originComponent,
            List<Map<String, ToscaTemplateRequirement>> toscaRequirements, Map<String, Component> componentCache) {
        List<RequirementCapabilityRelDef> filteredRelations = relations.stream()
                .filter(p -> componentInstance.getUniqueId().equals(p.getFromNode())).collect(Collectors.toList());
        return isEmpty(filteredRelations) ||
                filteredRelations.stream()
                        .allMatch(rel -> addRequirement(componentInstance, originComponent, component.getComponentInstances(), rel, toscaRequirements, componentCache));
    }

    private boolean addRequirement(ComponentInstance fromInstance, Component fromOriginComponent,
            List<ComponentInstance> instancesList, RequirementCapabilityRelDef rel,
            List<Map<String, ToscaTemplateRequirement>> toscaRequirements, Map<String, Component> componentCache) {

        boolean result = true;
        Map<String, List<RequirementDefinition>> reqMap = fromOriginComponent.getRequirements();
        RelationshipInfo reqAndRelationshipPair = rel.getRelationships().get(0).getRelation();
        Either<Component, StorageOperationStatus> getOriginRes = null;
        Optional<RequirementDefinition> reqOpt = Optional.empty();
        Component toOriginComponent = null;
        Optional<CapabilityDefinition> capOpt = Optional.empty();

        ComponentInstance toInstance = instancesList.stream().filter(i -> rel.getToNode().equals(i.getUniqueId()))
                .findFirst().orElse(null);
        if (toInstance == null) {
            log.debug("Failed to find a relation from the node {} to the node {}", fromInstance.getName(),
                    rel.getToNode());
            result = false;
        }
        if (result) {
            reqOpt = findRequirement(fromOriginComponent, reqMap, reqAndRelationshipPair, fromInstance.getUniqueId());
            if (!reqOpt.isPresent()) {
                log.debug("Failed to find a requirement with uniqueId {} on a component with uniqueId {}",
                        reqAndRelationshipPair.getRequirementUid(), fromOriginComponent.getUniqueId());
                result = false;
            }
        }
        if (result) {
            ComponentParametersView filter = new ComponentParametersView(true);
            filter.setIgnoreComponentInstances(false);
            filter.setIgnoreCapabilities(false);
            filter.setIgnoreGroups(false);
            getOriginRes = toscaOperationFacade.getToscaElement(toInstance.getActualComponentUid(), filter);
            if (getOriginRes.isRight()) {
                log.debug("Failed to build substituted name for the requirement {}. Failed to get an origin component with uniqueId {}",
                        reqOpt.get().getName(), toInstance.getActualComponentUid());
                result = false;
            }
        }
        if (result) {
            toOriginComponent = getOriginRes.left().value();
            capOpt = toOriginComponent.getCapabilities().get(reqOpt.get().getCapability()).stream()
                    .filter(c -> isCapabilityBelongToRelation(reqAndRelationshipPair, c)).findFirst();
            if (!capOpt.isPresent()) {
                capOpt = findCapability(reqAndRelationshipPair, toOriginComponent, fromOriginComponent, reqOpt.get());
                if(!capOpt.isPresent()){
                result = false;
                log.debug("Failed to find a capability with name {} on a component with uniqueId {}",
                        reqAndRelationshipPair.getCapability(), fromOriginComponent.getUniqueId());
                }
            }
        }
        if (result) {
            result = buildAndAddRequirement(toscaRequirements, fromOriginComponent, toOriginComponent, capOpt.get(),
                    reqOpt.get(), reqAndRelationshipPair, toInstance, componentCache);
        }
        return result;
    }

    private boolean isCapabilityBelongToRelation(RelationshipInfo reqAndRelationshipPair, CapabilityDefinition capability) {
        return capability.getName().equals(reqAndRelationshipPair.getCapability()) && (capability.getOwnerId() !=null && capability.getOwnerId().equals(reqAndRelationshipPair.getCapabilityOwnerId()));
    }

    private Optional<CapabilityDefinition> findCapability(RelationshipInfo reqAndRelationshipPair, Component toOriginComponent, Component fromOriginComponent, RequirementDefinition requirement) {
        Optional<CapabilityDefinition> cap = toOriginComponent.getCapabilities().get(requirement.getCapability()).stream().filter(c -> c.getType().equals(requirement.getCapability())).findFirst();
        if (!cap.isPresent()) {
            log.debug("Failed to find a capability with name {} on a component with uniqueId {}", reqAndRelationshipPair.getCapability(), fromOriginComponent.getUniqueId());
        }
        return cap;
    }

    private boolean buildAndAddRequirement(List<Map<String, ToscaTemplateRequirement>> toscaRequirements, Component fromOriginComponent, Component toOriginComponent, CapabilityDefinition capability, RequirementDefinition requirement, RelationshipInfo reqAndRelationshipPair, ComponentInstance toInstance, Map<String, Component> componentCache) {
        List<String> reducedPath = capability.getPath();
        if(capability.getOwnerId() !=null){
            reducedPath =   capabilityRequirementConverter.getReducedPathByOwner(capability.getPath() , capability.getOwnerId() );
        }
        Either<String, Boolean> buildCapNameRes = capabilityRequirementConverter.buildSubstitutedName(componentCache,
                toOriginComponent, reducedPath, reqAndRelationshipPair.getCapability(), capability.getPreviousName());
        if (buildCapNameRes.isRight()) {
            log.debug(
                    "Failed to build a substituted capability name for the capability with name {} on a component with uniqueId {}",
                    reqAndRelationshipPair.getCapability(), fromOriginComponent.getUniqueId());
            return false;
        }
        Either<String, Boolean> buildReqNameRes  = capabilityRequirementConverter.buildSubstitutedName(componentCache, fromOriginComponent,
                requirement.getPath(), reqAndRelationshipPair.getRequirement(), requirement.getPreviousName());
        if (buildReqNameRes.isRight()) {
            log.debug(
                    "Failed to build a substituted requirement name for the requirement with name {} on a component with uniqueId {}",
                    reqAndRelationshipPair.getRequirement(), fromOriginComponent.getUniqueId());
            return false;
        }
        ToscaTemplateRequirement toscaRequirement = new ToscaTemplateRequirement();
        Map<String, ToscaTemplateRequirement> toscaReqMap = new HashMap<>();
        toscaRequirement.setNode(toInstance.getName());
        toscaRequirement.setCapability(buildCapNameRes.left().value());
        toscaReqMap.put(buildReqNameRes.left().value(), toscaRequirement);
        toscaRequirements.add(toscaReqMap);
        return true;
    }

    private Optional<RequirementDefinition> findRequirement(Component fromOriginComponent, Map<String, List<RequirementDefinition>> reqMap, RelationshipInfo reqAndRelationshipPair,  String fromInstanceId) {
        for(List<RequirementDefinition> reqList: reqMap.values()){
            Optional<RequirementDefinition> reqOpt = reqList.stream().filter(r -> isRequirementBelongToRelation(fromOriginComponent, reqAndRelationshipPair, r, fromInstanceId)).findFirst();
            if(reqOpt.isPresent()){
                return reqOpt;
            }
        }
        return Optional.empty();
    }

    /**
     * Allows detecting the requirement belonging to the received relationship
     * The detection logic is: A requirement belongs to a relationship IF 1.The
     * name of the requirement equals to the "requirement" field of the
     * relation; AND 2. In case of a non-atomic resource, OwnerId of the
     * requirement equals to requirementOwnerId of the relation OR uniqueId of
     * toInstance equals to capabilityOwnerId of the relation
     */
    private boolean isRequirementBelongToRelation(Component originComponent, RelationshipInfo reqAndRelationshipPair, RequirementDefinition requirement, String fromInstanceId) {
        if (!StringUtils.equals(requirement.getName(), reqAndRelationshipPair.getRequirement())) {
            log.debug("Failed to find a requirement with name {} and  reqAndRelationshipPair {}",
                    requirement.getName(), reqAndRelationshipPair.getRequirement());
            return false;
        }
        return ModelConverter.isAtomicComponent(originComponent) ||
                isRequirementBelongToOwner(reqAndRelationshipPair, requirement, fromInstanceId, originComponent);
    }

    private boolean isRequirementBelongToOwner(RelationshipInfo reqAndRelationshipPair, RequirementDefinition requirement, String fromInstanceId, Component originComponent) {
        return StringUtils.equals(requirement.getOwnerId(), reqAndRelationshipPair.getRequirementOwnerId()) || (isCvfc(originComponent) && StringUtils.equals(fromInstanceId, reqAndRelationshipPair.getRequirementOwnerId()));
    }

    private boolean isCvfc(Component component) {
        return component.getComponentType() == ComponentTypeEnum.RESOURCE &&
                ((Resource) component).getResourceType() == ResourceTypeEnum.CVFC;
    }

    private Either<SubstitutionMapping, ToscaError> convertCapabilities(Component component,
            SubstitutionMapping substitutionMappings, Map<String, Component> componentCache) {

        Either<SubstitutionMapping, ToscaError> result = Either.left(substitutionMappings);
        Either<Map<String, String[]>, ToscaError> toscaCapabilitiesRes = capabilityRequirementConverter
                .convertSubstitutionMappingCapabilities(componentCache, component);
        if (toscaCapabilitiesRes.isRight()) {
            result = Either.right(toscaCapabilitiesRes.right().value());
            log.debug("Failed convert capabilities for the component {}. ", component.getName());
        } else if (isNotEmpty(toscaCapabilitiesRes.left().value())) {
            substitutionMappings.setCapabilities(toscaCapabilitiesRes.left().value());
            log.debug("Finish convert capabilities for the component {}. ", component.getName());
        }
        log.debug("Finished to convert capabilities for the component {}. ", component.getName());
        return result;
    }

    private Either<ToscaNodeType, ToscaError> convertCapabilities(Map<String, Component> componentsCache, Component component, ToscaNodeType nodeType,
            Map<String, DataTypeDefinition> dataTypes) {
        Map<String, ToscaCapability> toscaCapabilities = capabilityRequirementConverter.convertCapabilities(componentsCache, component,
                dataTypes);
        if (!toscaCapabilities.isEmpty()) {
            nodeType.setCapabilities(toscaCapabilities);
        }
        log.debug("Finish convert Capabilities for node type");

        return Either.left(nodeType);
    }

    private static class CustomRepresenter extends Representer {
        public CustomRepresenter() {
            super();
            // null representer is exceptional and it is stored as an instance
            // variable.
            this.nullRepresenter = new RepresentNull();

        }

        @Override
        protected NodeTuple representJavaBeanProperty(Object javaBean, Property property, Object propertyValue,
                Tag customTag) {
            if (propertyValue == null) {
                return null;
            } else {
                // skip not relevant for Tosca property
                if ("dependencies".equals(property.getName())) {
                    return null;
                }
                NodeTuple defaultNode = super.representJavaBeanProperty(javaBean, property, propertyValue, customTag);

                return "_defaultp_".equals(property.getName())
                        ? new NodeTuple(representData("default"), defaultNode.getValueNode()) : defaultNode;
            }
        }

        @Override
        protected MappingNode representJavaBean(Set<Property> properties, Object javaBean) {
            // remove the bean type from the output yaml (!! ...)
            if (!classTags.containsKey(javaBean.getClass())) {
                addClassTag(javaBean.getClass(), Tag.MAP);
            }

            return super.representJavaBean(properties, javaBean);
        }

        private class RepresentNull implements Represent {
            @Override
            public Node representData(Object data) {
                // possible values are here http://yaml.org/type/null.html
                return representScalar(Tag.NULL, "");
            }
        }
    }

    private static class UnsortedPropertyUtils extends PropertyUtils {
        @Override
        protected Set<Property> createPropertySet(Class type, BeanAccess bAccess)
                throws IntrospectionException {
            Collection<Property> fields = getPropertiesMap(type, BeanAccess.FIELD).values();
            return new LinkedHashSet<>(fields);
        }
    }

}