/*
 * 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 org.apache.syncope.core.provisioning.java.data;

import java.text.ParseException;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.apache.commons.lang3.StringUtils;
import org.apache.syncope.common.lib.SyncopeClientCompositeException;
import org.apache.syncope.common.lib.SyncopeClientException;
import org.apache.syncope.common.lib.to.AnyTypeClassTO;
import org.apache.syncope.common.lib.to.ItemContainerTO;
import org.apache.syncope.common.lib.to.ItemTO;
import org.apache.syncope.common.lib.to.MappingTO;
import org.apache.syncope.common.lib.to.OrgUnitTO;
import org.apache.syncope.common.lib.to.ProvisionTO;
import org.apache.syncope.common.lib.to.ResourceTO;
import org.apache.syncope.common.lib.types.ClientExceptionType;
import org.apache.syncope.common.lib.types.MappingPurpose;
import org.apache.syncope.common.lib.types.SchemaType;
import org.apache.syncope.core.persistence.api.dao.AnyTypeClassDAO;
import org.apache.syncope.core.persistence.api.dao.ConnInstanceDAO;
import org.apache.syncope.core.persistence.api.dao.PolicyDAO;
import org.apache.syncope.core.persistence.api.entity.policy.AccountPolicy;
import org.apache.syncope.core.persistence.api.entity.ConnInstance;
import org.apache.syncope.core.persistence.api.entity.EntityFactory;
import org.apache.syncope.core.persistence.api.entity.resource.ExternalResource;
import org.apache.syncope.core.persistence.api.entity.resource.Mapping;
import org.apache.syncope.core.persistence.api.entity.resource.MappingItem;
import org.apache.syncope.core.persistence.api.entity.policy.PasswordPolicy;
import org.apache.syncope.core.provisioning.api.jexl.JexlUtils;
import org.apache.syncope.core.persistence.api.dao.AnyTypeDAO;
import org.apache.syncope.core.persistence.api.dao.ImplementationDAO;
import org.apache.syncope.core.persistence.api.dao.PlainSchemaDAO;
import org.apache.syncope.core.persistence.api.dao.VirSchemaDAO;
import org.apache.syncope.core.persistence.api.entity.AnyType;
import org.apache.syncope.core.persistence.api.entity.AnyTypeClass;
import org.apache.syncope.core.persistence.api.entity.Entity;
import org.apache.syncope.core.persistence.api.entity.Implementation;
import org.apache.syncope.core.persistence.api.entity.PlainSchema;
import org.apache.syncope.core.persistence.api.entity.VirSchema;
import org.apache.syncope.core.persistence.api.entity.policy.PropagationPolicy;
import org.apache.syncope.core.persistence.api.entity.policy.PullPolicy;
import org.apache.syncope.core.persistence.api.entity.policy.PushPolicy;
import org.apache.syncope.core.persistence.api.entity.resource.Item;
import org.apache.syncope.core.persistence.api.entity.resource.OrgUnit;
import org.apache.syncope.core.persistence.api.entity.resource.OrgUnitItem;
import org.apache.syncope.core.persistence.api.entity.resource.Provision;
import org.apache.syncope.core.provisioning.api.IntAttrNameParser;
import org.apache.syncope.core.provisioning.api.IntAttrName;
import org.apache.syncope.core.provisioning.api.data.ResourceDataBinder;
import org.apache.syncope.core.provisioning.api.propagation.PropagationTaskExecutor;
import org.identityconnectors.framework.common.objects.ObjectClass;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class ResourceDataBinderImpl implements ResourceDataBinder {

    private static final Logger LOG = LoggerFactory.getLogger(ResourceDataBinder.class);

    @Autowired
    private AnyTypeDAO anyTypeDAO;

    @Autowired
    private ConnInstanceDAO connInstanceDAO;

    @Autowired
    private PolicyDAO policyDAO;

    @Autowired
    private VirSchemaDAO virSchemaDAO;

    @Autowired
    private AnyTypeClassDAO anyTypeClassDAO;

    @Autowired
    private ImplementationDAO implementationDAO;

    @Autowired
    private PlainSchemaDAO plainSchemaDAO;

    @Autowired
    private EntityFactory entityFactory;

    @Autowired
    private IntAttrNameParser intAttrNameParser;

    @Autowired
    private PropagationTaskExecutor propagationTaskExecutor;

    @Override
    public ExternalResource create(final ResourceTO resourceTO) {
        return update(entityFactory.newEntity(ExternalResource.class), resourceTO);
    }

    @Override
    public ExternalResource update(final ExternalResource resource, final ResourceTO resourceTO) {
        resource.setKey(resourceTO.getKey());

        if (resourceTO.getConnector() != null) {
            ConnInstance connector = connInstanceDAO.find(resourceTO.getConnector());
            resource.setConnector(connector);

            if (!connector.getResources().contains(resource)) {
                connector.add(resource);
            }
        }

        resource.setEnforceMandatoryCondition(resourceTO.isEnforceMandatoryCondition());

        resource.setPropagationPriority(resourceTO.getPropagationPriority());

        resource.setRandomPwdIfNotProvided(resourceTO.isRandomPwdIfNotProvided());

        // 1. add or update all (valid) provisions from TO
        resourceTO.getProvisions().forEach(provisionTO -> {
            AnyType anyType = anyTypeDAO.find(provisionTO.getAnyType());
            if (anyType == null) {
                LOG.debug("Invalid {} specified {}, ignoring...",
                        AnyType.class.getSimpleName(), provisionTO.getAnyType());
            } else {
                Provision provision = resource.getProvision(anyType).orElse(null);
                if (provision == null) {
                    provision = entityFactory.newEntity(Provision.class);
                    provision.setResource(resource);
                    resource.add(provision);
                    provision.setAnyType(anyType);
                }

                if (provisionTO.getObjectClass() == null) {
                    SyncopeClientException sce = SyncopeClientException.build(ClientExceptionType.InvalidProvision);
                    sce.getElements().add("Null " + ObjectClass.class.getSimpleName());
                    throw sce;
                }
                provision.setObjectClass(new ObjectClass(provisionTO.getObjectClass()));

                // add all classes contained in the TO
                for (String name : provisionTO.getAuxClasses()) {
                    AnyTypeClass anyTypeClass = anyTypeClassDAO.find(name);
                    if (anyTypeClass == null) {
                        LOG.warn("Ignoring invalid {}: {}", AnyTypeClass.class.getSimpleName(), name);
                    } else {
                        provision.add(anyTypeClass);
                    }
                }
                // remove all classes not contained in the TO
                provision.getAuxClasses().
                        removeIf(anyTypeClass -> !provisionTO.getAuxClasses().contains(anyTypeClass.getKey()));

                provision.setIgnoreCaseMatch(provisionTO.isIgnoreCaseMatch());

                if (StringUtils.isBlank(provisionTO.getUidOnCreate())) {
                    provision.setUidOnCreate(null);
                } else {
                    PlainSchema uidOnCreate = plainSchemaDAO.find(provisionTO.getUidOnCreate());
                    if (uidOnCreate == null) {
                        LOG.warn("Ignoring invalid schema for uidOnCreate: {}", provisionTO.getUidOnCreate());
                        provision.setUidOnCreate(null);
                    } else {
                        provision.setUidOnCreate(uidOnCreate);
                    }
                }

                if (provisionTO.getMapping() == null) {
                    provision.setMapping(null);
                } else {
                    Mapping mapping = provision.getMapping();
                    if (mapping == null) {
                        mapping = entityFactory.newEntity(Mapping.class);
                        mapping.setProvision(provision);
                        provision.setMapping(mapping);
                    } else {
                        mapping.getItems().clear();
                    }

                    AnyTypeClassTO allowedSchemas = new AnyTypeClassTO();
                    Stream.concat(
                            provision.getAnyType().getClasses().stream(),
                            provision.getAuxClasses().stream()).forEach(anyTypeClass -> {

                        allowedSchemas.getPlainSchemas().addAll(anyTypeClass.getPlainSchemas().stream().
                                map(Entity::getKey).collect(Collectors.toList()));
                        allowedSchemas.getDerSchemas().addAll(anyTypeClass.getDerSchemas().stream().
                                map(Entity::getKey).collect(Collectors.toList()));
                        allowedSchemas.getVirSchemas().addAll(anyTypeClass.getVirSchemas().stream().
                                map(Entity::getKey).collect(Collectors.toList()));
                    });

                    populateMapping(
                            provisionTO.getMapping(),
                            mapping,
                            allowedSchemas);
                }

                if (provisionTO.getVirSchemas().isEmpty()) {
                    for (VirSchema schema : virSchemaDAO.findByProvision(provision)) {
                        virSchemaDAO.delete(schema.getKey());
                    }
                } else {
                    for (String schemaName : provisionTO.getVirSchemas()) {
                        VirSchema schema = virSchemaDAO.find(schemaName);
                        if (schema == null) {
                            LOG.debug("Invalid {} specified: {}, ignoring...",
                                    VirSchema.class.getSimpleName(), schemaName);
                        } else {
                            schema.setProvision(provision);
                        }
                    }
                }
            }
        });

        // 2. remove all provisions not contained in the TO
        for (Iterator<? extends Provision> itor = resource.getProvisions().iterator(); itor.hasNext();) {
            Provision provision = itor.next();
            if (!resourceTO.getProvision(provision.getAnyType().getKey()).isPresent()) {
                virSchemaDAO.findByProvision(provision).forEach(schema -> {
                    virSchemaDAO.delete(schema.getKey());
                });

                itor.remove();
            }
        }

        // 3. orgUnit
        if (resourceTO.getOrgUnit() == null && resource.getOrgUnit() != null) {
            resource.getOrgUnit().setResource(null);
            resource.setOrgUnit(null);
        } else if (resourceTO.getOrgUnit() != null) {
            OrgUnitTO orgUnitTO = resourceTO.getOrgUnit();

            OrgUnit orgUnit = resource.getOrgUnit();
            if (orgUnit == null) {
                orgUnit = entityFactory.newEntity(OrgUnit.class);
                orgUnit.setResource(resource);
                resource.setOrgUnit(orgUnit);
            }

            if (orgUnitTO.getObjectClass() == null) {
                SyncopeClientException sce = SyncopeClientException.build(ClientExceptionType.InvalidOrgUnit);
                sce.getElements().add("Null " + ObjectClass.class.getSimpleName());
                throw sce;
            }
            orgUnit.setObjectClass(new ObjectClass(orgUnitTO.getObjectClass()));

            orgUnit.setIgnoreCaseMatch(orgUnitTO.isIgnoreCaseMatch());

            if (orgUnitTO.getConnObjectLink() == null) {
                SyncopeClientException sce = SyncopeClientException.build(ClientExceptionType.InvalidOrgUnit);
                sce.getElements().add("Null connObjectLink");
                throw sce;
            }
            orgUnit.setConnObjectLink(orgUnitTO.getConnObjectLink());

            SyncopeClientCompositeException scce = SyncopeClientException.buildComposite();
            SyncopeClientException invalidMapping = SyncopeClientException.build(
                    ClientExceptionType.InvalidMapping);
            SyncopeClientException requiredValuesMissing = SyncopeClientException.build(
                    ClientExceptionType.RequiredValuesMissing);

            orgUnit.getItems().clear();
            for (ItemTO itemTO : orgUnitTO.getItems()) {
                if (itemTO == null) {
                    LOG.error("Null {}", ItemTO.class.getSimpleName());
                    invalidMapping.getElements().add("Null " + ItemTO.class.getSimpleName());
                } else if (itemTO.getIntAttrName() == null) {
                    requiredValuesMissing.getElements().add("intAttrName");
                    scce.addException(requiredValuesMissing);
                } else {
                    if (!"name".equals(itemTO.getIntAttrName()) && !"fullpath".equals(itemTO.getIntAttrName())) {
                        LOG.error("Only 'name' and 'fullpath' are supported for Realms");
                        invalidMapping.getElements().add("Only 'name' and 'fullpath' are supported for Realms");
                    } else {
                        // no mandatory condition implies mandatory condition false
                        if (!JexlUtils.isExpressionValid(itemTO.getMandatoryCondition() == null
                                ? "false" : itemTO.getMandatoryCondition())) {

                            SyncopeClientException invalidMandatoryCondition = SyncopeClientException.build(
                                    ClientExceptionType.InvalidValues);
                            invalidMandatoryCondition.getElements().add(itemTO.getMandatoryCondition());
                            scce.addException(invalidMandatoryCondition);
                        }

                        OrgUnitItem item = entityFactory.newEntity(OrgUnitItem.class);
                        item.setIntAttrName(itemTO.getIntAttrName());
                        item.setExtAttrName(itemTO.getExtAttrName());
                        item.setPurpose(itemTO.getPurpose());
                        item.setMandatoryCondition(itemTO.getMandatoryCondition());
                        item.setConnObjectKey(itemTO.isConnObjectKey());
                        item.setPassword(itemTO.isPassword());
                        item.setPropagationJEXLTransformer(itemTO.getPropagationJEXLTransformer());
                        item.setPullJEXLTransformer(itemTO.getPullJEXLTransformer());
                        item.setOrgUnit(orgUnit);
                        if (item.isConnObjectKey()) {
                            orgUnit.setConnObjectKeyItem(item);
                        } else {
                            orgUnit.add(item);
                        }

                        itemTO.getTransformers().forEach(transformerKey -> {
                            Implementation transformer = implementationDAO.find(transformerKey);
                            if (transformer == null) {
                                LOG.debug("Invalid " + Implementation.class.getSimpleName() + " {}, ignoring...",
                                        transformerKey);
                            } else {
                                item.add(transformer);
                            }
                        });
                        // remove all implementations not contained in the TO
                        item.getTransformers().
                                removeIf(implementation -> !itemTO.getTransformers().contains(implementation.getKey()));
                    }
                }
            }
            if (!invalidMapping.getElements().isEmpty()) {
                scce.addException(invalidMapping);
            }
            if (scce.hasExceptions()) {
                throw scce;
            }
        }

        resource.setCreateTraceLevel(resourceTO.getCreateTraceLevel());
        resource.setUpdateTraceLevel(resourceTO.getUpdateTraceLevel());
        resource.setDeleteTraceLevel(resourceTO.getDeleteTraceLevel());
        resource.setProvisioningTraceLevel(resourceTO.getProvisioningTraceLevel());

        resource.setPasswordPolicy(resourceTO.getPasswordPolicy() == null
                ? null : (PasswordPolicy) policyDAO.find(resourceTO.getPasswordPolicy()));

        resource.setAccountPolicy(resourceTO.getAccountPolicy() == null
                ? null : (AccountPolicy) policyDAO.find(resourceTO.getAccountPolicy()));

        if (resource.getPropagationPolicy() != null
                && !resource.getPropagationPolicy().getKey().equals(resourceTO.getPropagationPolicy())) {

            propagationTaskExecutor.expireRetryTemplate(resource.getKey());
        }
        resource.setPropagationPolicy(resourceTO.getPropagationPolicy() == null
                ? null : (PropagationPolicy) policyDAO.find(resourceTO.getPropagationPolicy()));

        resource.setPullPolicy(resourceTO.getPullPolicy() == null
                ? null : (PullPolicy) policyDAO.find(resourceTO.getPullPolicy()));

        resource.setPushPolicy(resourceTO.getPushPolicy() == null
                ? null : (PushPolicy) policyDAO.find(resourceTO.getPushPolicy()));

        if (resourceTO.getProvisionSorter() == null) {
            resource.setProvisionSorter(null);
        } else {
            Implementation provisionSorter = implementationDAO.find(resourceTO.getProvisionSorter());
            if (provisionSorter == null) {
                LOG.debug("Invalid " + Implementation.class.getSimpleName() + " {}, ignoring...",
                        resourceTO.getProvisionSorter());
            } else {
                resource.setProvisionSorter(provisionSorter);
            }
        }

        resource.setConfOverride(new HashSet<>(resourceTO.getConfOverride()));

        resource.setOverrideCapabilities(resourceTO.isOverrideCapabilities());
        resource.getCapabilitiesOverride().clear();
        resource.getCapabilitiesOverride().addAll(resourceTO.getCapabilitiesOverride());

        resourceTO.getPropagationActions().forEach(propagationActionKey -> {
            Implementation propagationAction = implementationDAO.find(propagationActionKey);
            if (propagationAction == null) {
                LOG.debug("Invalid " + Implementation.class.getSimpleName() + " {}, ignoring...", propagationActionKey);
            } else {
                resource.add(propagationAction);
            }
        });
        // remove all implementations not contained in the TO
        resource.getPropagationActions().
                removeIf(implementation -> !resourceTO.getPropagationActions().contains(implementation.getKey()));

        return resource;
    }

    private void populateMapping(
            final MappingTO mappingTO,
            final Mapping mapping,
            final AnyTypeClassTO allowedSchemas) {

        mapping.setConnObjectLink(mappingTO.getConnObjectLink());

        SyncopeClientCompositeException scce = SyncopeClientException.buildComposite();
        SyncopeClientException invalidMapping = SyncopeClientException.build(ClientExceptionType.InvalidMapping);
        SyncopeClientException requiredValuesMissing = SyncopeClientException.build(
                ClientExceptionType.RequiredValuesMissing);

        for (ItemTO itemTO : mappingTO.getItems()) {
            if (itemTO == null) {
                LOG.error("Null {}", ItemTO.class.getSimpleName());
                invalidMapping.getElements().add("Null " + ItemTO.class.getSimpleName());
            } else if (itemTO.getIntAttrName() == null) {
                requiredValuesMissing.getElements().add("intAttrName");
                scce.addException(requiredValuesMissing);
            } else {
                IntAttrName intAttrName = null;
                try {
                    intAttrName = intAttrNameParser.parse(
                            itemTO.getIntAttrName(), mapping.getProvision().getAnyType().getKind());
                } catch (ParseException e) {
                    LOG.error("Invalid intAttrName '{}'", itemTO.getIntAttrName(), e);
                }

                if (intAttrName == null
                        || intAttrName.getSchemaType() == null && intAttrName.getField() == null
                        && intAttrName.getPrivilegesOfApplication() == null) {

                    LOG.error("'{}' not existing", itemTO.getIntAttrName());
                    invalidMapping.getElements().add("'" + itemTO.getIntAttrName() + "' not existing");
                } else {
                    boolean allowed = true;
                    if (intAttrName.getSchemaType() != null
                            && intAttrName.getEnclosingGroup() == null
                            && intAttrName.getRelatedAnyObject() == null
                            && intAttrName.getRelationshipType() == null
                            && intAttrName.getPrivilegesOfApplication() == null) {

                        switch (intAttrName.getSchemaType()) {
                            case PLAIN:
                                allowed = allowedSchemas.getPlainSchemas().contains(intAttrName.getSchema().getKey());
                                break;

                            case DERIVED:
                                allowed = allowedSchemas.getDerSchemas().contains(intAttrName.getSchema().getKey());
                                break;

                            case VIRTUAL:
                                allowed = allowedSchemas.getVirSchemas().contains(intAttrName.getSchema().getKey());
                                break;

                            default:
                        }
                    }

                    if (allowed) {
                        // no mandatory condition implies mandatory condition false
                        if (!JexlUtils.isExpressionValid(itemTO.getMandatoryCondition() == null
                                ? "false" : itemTO.getMandatoryCondition())) {

                            SyncopeClientException invalidMandatoryCondition = SyncopeClientException.build(
                                    ClientExceptionType.InvalidValues);
                            invalidMandatoryCondition.getElements().add(itemTO.getMandatoryCondition());
                            scce.addException(invalidMandatoryCondition);
                        }

                        MappingItem item = entityFactory.newEntity(MappingItem.class);
                        item.setIntAttrName(itemTO.getIntAttrName());
                        item.setExtAttrName(itemTO.getExtAttrName());
                        item.setPurpose(itemTO.getPurpose());
                        item.setMandatoryCondition(itemTO.getMandatoryCondition());
                        item.setConnObjectKey(itemTO.isConnObjectKey());
                        item.setPassword(itemTO.isPassword());
                        item.setPropagationJEXLTransformer(itemTO.getPropagationJEXLTransformer());
                        item.setPullJEXLTransformer(itemTO.getPullJEXLTransformer());
                        item.setMapping(mapping);

                        if (item.isConnObjectKey()) {
                            if (intAttrName.getSchemaType() == SchemaType.VIRTUAL) {
                                invalidMapping.getElements().
                                        add("Virtual attributes cannot be set as ConnObjectKey");
                            }
                            if ("password".equals(intAttrName.getField())) {
                                invalidMapping.getElements().add(
                                        "Password attributes cannot be set as ConnObjectKey");
                            }

                            mapping.setConnObjectKeyItem(item);
                        } else {
                            mapping.add(item);
                        }

                        itemTO.getTransformers().forEach(transformerKey -> {
                            Implementation transformer = implementationDAO.find(transformerKey);
                            if (transformer == null) {
                                LOG.debug("Invalid " + Implementation.class.getSimpleName() + " {}, ignoring...",
                                        transformerKey);
                            } else {
                                item.add(transformer);
                            }
                        });
                        // remove all implementations not contained in the TO
                        item.getTransformers().
                                removeIf(implementation -> !itemTO.getTransformers().contains(implementation.getKey()));

                        if (intAttrName.getEnclosingGroup() != null
                                && item.getPurpose() != MappingPurpose.PROPAGATION) {

                            invalidMapping.getElements().add(
                                    "Only " + MappingPurpose.PROPAGATION.name()
                                    + " allowed when referring to groups");
                        }
                        if (intAttrName.getRelatedAnyObject() != null
                                && item.getPurpose() != MappingPurpose.PROPAGATION) {

                            invalidMapping.getElements().add(
                                    "Only " + MappingPurpose.PROPAGATION.name()
                                    + " allowed when referring to any objects");
                        }
                        if (intAttrName.getPrivilegesOfApplication() != null
                                && item.getPurpose() != MappingPurpose.PROPAGATION) {

                            invalidMapping.getElements().add(
                                    "Only " + MappingPurpose.PROPAGATION.name()
                                    + " allowed when referring to privileges");
                        }
                        if (intAttrName.getSchemaType() == SchemaType.DERIVED
                                && item.getPurpose() != MappingPurpose.PROPAGATION) {

                            invalidMapping.getElements().add(
                                    "Only " + MappingPurpose.PROPAGATION.name() + " allowed for derived");
                        }
                        if (intAttrName.getSchemaType() == SchemaType.VIRTUAL) {
                            if (item.getPurpose() != MappingPurpose.PROPAGATION) {
                                invalidMapping.getElements().add(
                                        "Only " + MappingPurpose.PROPAGATION.name() + " allowed for virtual");
                            }

                            VirSchema schema = virSchemaDAO.find(item.getIntAttrName());
                            if (schema != null && schema.getProvision().equals(item.getMapping().getProvision())) {
                                invalidMapping.getElements().add(
                                        "No need to map virtual schema on linking resource");
                            }
                        }
                        if (intAttrName.getRelatedUser() != null
                                && item.getPurpose() != MappingPurpose.PROPAGATION) {

                            invalidMapping.getElements().add(
                                    "Only " + MappingPurpose.PROPAGATION.name()
                                    + " allowed when referring to users");
                        }
                        if ((intAttrName.getRelationshipType() != null
                                || intAttrName.getRelationshipAnyType() != null)
                                && item.getPurpose() != MappingPurpose.PROPAGATION) {

                            invalidMapping.getElements().add(
                                    "Only " + MappingPurpose.PROPAGATION.name()
                                    + " allowed when referring to relationships");
                        }
                    } else {
                        LOG.error("'{}' not allowed", itemTO.getIntAttrName());
                        invalidMapping.getElements().add("'" + itemTO.getIntAttrName() + "' not allowed");
                    }
                }
            }
        }

        if (!invalidMapping.getElements().isEmpty()) {
            scce.addException(invalidMapping);
        }
        if (scce.hasExceptions()) {
            throw scce;
        }
    }

    private void populateItems(final List<? extends Item> items, final ItemContainerTO containerTO) {
        items.forEach(item -> {
            ItemTO itemTO = new ItemTO();
            itemTO.setKey(item.getKey());
            itemTO.setIntAttrName(item.getIntAttrName());
            itemTO.setExtAttrName(item.getExtAttrName());
            itemTO.setPurpose(item.getPurpose());
            itemTO.setMandatoryCondition(item.getMandatoryCondition());
            itemTO.setConnObjectKey(item.isConnObjectKey());
            itemTO.setPassword(item.isPassword());
            itemTO.setPropagationJEXLTransformer(item.getPropagationJEXLTransformer());
            itemTO.setPullJEXLTransformer(item.getPullJEXLTransformer());

            if (itemTO.isConnObjectKey()) {
                containerTO.setConnObjectKeyItem(itemTO);
            } else {
                containerTO.add(itemTO);
            }

            itemTO.getTransformers().addAll(item.getTransformers().stream().
                    map(Entity::getKey).collect(Collectors.toSet()));
        });
    }

    @Override
    public ResourceTO getResourceTO(final ExternalResource resource) {
        ResourceTO resourceTO = new ResourceTO();

        // set the resource name
        resourceTO.setKey(resource.getKey());

        // set the connector instance
        ConnInstance connector = resource.getConnector();

        resourceTO.setConnector(connector == null ? null : connector.getKey());
        resourceTO.setConnectorDisplayName(connector == null ? null : connector.getDisplayName());

        // set the provision information
        resource.getProvisions().forEach(provision -> {
            ProvisionTO provisionTO = new ProvisionTO();
            provisionTO.setKey(provision.getKey());
            provisionTO.setAnyType(provision.getAnyType().getKey());
            provisionTO.setObjectClass(provision.getObjectClass().getObjectClassValue());
            provisionTO.getAuxClasses().addAll(provision.getAuxClasses().stream().
                    map(Entity::getKey).collect(Collectors.toList()));
            provisionTO.setSyncToken(provision.getSerializedSyncToken());
            provisionTO.setIgnoreCaseMatch(provision.isIgnoreCaseMatch());
            if (provision.getUidOnCreate() != null) {
                provisionTO.setUidOnCreate(provision.getUidOnCreate().getKey());
            }

            if (provision.getMapping() != null) {
                MappingTO mappingTO = new MappingTO();
                provisionTO.setMapping(mappingTO);
                mappingTO.setConnObjectLink(provision.getMapping().getConnObjectLink());
                populateItems(provision.getMapping().getItems(), mappingTO);
            }

            virSchemaDAO.findByProvision(provision).forEach(virSchema -> {
                provisionTO.getVirSchemas().add(virSchema.getKey());

                MappingItem linkingMappingItem = virSchema.asLinkingMappingItem();

                ItemTO itemTO = new ItemTO();
                itemTO.setKey(linkingMappingItem.getKey());
                itemTO.setIntAttrName(linkingMappingItem.getIntAttrName());
                itemTO.setExtAttrName(linkingMappingItem.getExtAttrName());
                itemTO.setPurpose(linkingMappingItem.getPurpose());
                itemTO.setMandatoryCondition(linkingMappingItem.getMandatoryCondition());
                itemTO.setConnObjectKey(linkingMappingItem.isConnObjectKey());
                itemTO.setPassword(linkingMappingItem.isPassword());
                itemTO.setPropagationJEXLTransformer(linkingMappingItem.getPropagationJEXLTransformer());
                itemTO.setPullJEXLTransformer(linkingMappingItem.getPullJEXLTransformer());

                provisionTO.getMapping().getLinkingItems().add(itemTO);
            });

            resourceTO.getProvisions().add(provisionTO);
        });

        if (resource.getOrgUnit() != null) {
            OrgUnit orgUnit = resource.getOrgUnit();

            OrgUnitTO orgUnitTO = new OrgUnitTO();
            orgUnitTO.setKey(orgUnit.getKey());
            orgUnitTO.setObjectClass(orgUnit.getObjectClass().getObjectClassValue());
            orgUnitTO.setSyncToken(orgUnit.getSerializedSyncToken());
            orgUnitTO.setIgnoreCaseMatch(orgUnit.isIgnoreCaseMatch());
            orgUnitTO.setConnObjectLink(orgUnit.getConnObjectLink());
            populateItems(orgUnit.getItems(), orgUnitTO);

            resourceTO.setOrgUnit(orgUnitTO);
        }

        resourceTO.setEnforceMandatoryCondition(resource.isEnforceMandatoryCondition());

        resourceTO.setPropagationPriority(resource.getPropagationPriority());

        resourceTO.setRandomPwdIfNotProvided(resource.isRandomPwdIfNotProvided());

        resourceTO.setCreateTraceLevel(resource.getCreateTraceLevel());
        resourceTO.setUpdateTraceLevel(resource.getUpdateTraceLevel());
        resourceTO.setDeleteTraceLevel(resource.getDeleteTraceLevel());
        resourceTO.setProvisioningTraceLevel(resource.getProvisioningTraceLevel());

        resourceTO.setPasswordPolicy(resource.getPasswordPolicy() == null
                ? null : resource.getPasswordPolicy().getKey());

        resourceTO.setAccountPolicy(resource.getAccountPolicy() == null
                ? null : resource.getAccountPolicy().getKey());

        resourceTO.setPropagationPolicy(resource.getPropagationPolicy() == null
                ? null : resource.getPropagationPolicy().getKey());

        resourceTO.setPullPolicy(resource.getPullPolicy() == null
                ? null : resource.getPullPolicy().getKey());

        resourceTO.setPushPolicy(resource.getPushPolicy() == null
                ? null : resource.getPushPolicy().getKey());

        resourceTO.setProvisionSorter(resource.getProvisionSorter() == null
                ? null : resource.getProvisionSorter().getKey());

        resourceTO.getConfOverride().addAll(resource.getConfOverride());
        Collections.sort(resourceTO.getConfOverride());

        resourceTO.setOverrideCapabilities(resource.isOverrideCapabilities());
        resourceTO.getCapabilitiesOverride().addAll(resource.getCapabilitiesOverride());

        resourceTO.getPropagationActions().addAll(
                resource.getPropagationActions().stream().map(Entity::getKey).collect(Collectors.toList()));

        return resourceTO;
    }
}
