/*
 * ============LICENSE_START=======================================================
 *  Copyright (C) 2021 Nordix Foundation
 *  ================================================================================
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *  SPDX-License-Identifier: Apache-2.0
 *  ============LICENSE_END=========================================================
 */
package org.openecomp.sdc.be.model.operations.impl;

import fj.data.Either;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.collections4.MapUtils;
import org.openecomp.sdc.be.config.BeEcompErrorManager;
import org.openecomp.sdc.be.config.BeEcompErrorManager.ErrorSeverity;
import org.openecomp.sdc.be.dao.janusgraph.HealingJanusGraphGenericDao;
import org.openecomp.sdc.be.dao.janusgraph.JanusGraphOperationStatus;
import org.openecomp.sdc.be.datatypes.enums.NodeTypeEnum;
import org.openecomp.sdc.be.model.DataTypeDefinition;
import org.openecomp.sdc.be.resources.data.DataTypeData;
import org.openecomp.sdc.common.log.enums.EcompLoggerErrorCode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component("dataType-operation")
public class DataTypeOperation extends AbstractOperation {

    private static final Logger LOGGER = LoggerFactory.getLogger(DataTypeOperation.class);

    private final ModelOperation modelOperation;

    @Autowired
    public DataTypeOperation(final HealingJanusGraphGenericDao janusGraphGenericDao,
                             final ModelOperation modelOperation) {
        this.janusGraphGenericDao = janusGraphGenericDao;
        this.modelOperation = modelOperation;
    }

    public List<DataTypeData> getAllDataTypeNodes() {
        final List<DataTypeData> dataTypesFound = new ArrayList<>();
        final Either<List<DataTypeData>, JanusGraphOperationStatus> getAllDataTypesWithNullModel =
            janusGraphGenericDao.getByCriteria(NodeTypeEnum.DataType, null, DataTypeData.class);

        final var dataTypesValidated = validateDataType(getAllDataTypesWithNullModel, null);
        if (CollectionUtils.isNotEmpty(dataTypesValidated)) {
            dataTypesFound.addAll(dataTypesValidated);
        }

        final List<DataTypeData> allDataTypeNodesWithModel = getAllDataTypesWithModel();
        if(CollectionUtils.isNotEmpty(allDataTypeNodesWithModel)) {
            dataTypesFound.addAll(allDataTypeNodesWithModel);
        }
        return dataTypesFound;
    }

    public List<DataTypeData> getAllDataTypesWithModel() {
        final List<DataTypeData> dataTypesWithModel = new ArrayList<>();
        modelOperation.findAllModels()
            .forEach(model -> {
                final var modelName = model.getName();
                final Either<List<DataTypeData>, JanusGraphOperationStatus> getAllDataTypesByModel = janusGraphGenericDao
                    .getByCriteriaForModel(NodeTypeEnum.DataType, null, modelName, DataTypeData.class);
                final var dataTypesValidated = validateDataType(getAllDataTypesByModel, modelName);
                dataTypesWithModel.addAll(dataTypesValidated);
            });
        return dataTypesWithModel;
    }

    private List<DataTypeData> validateDataType(final Either<List<DataTypeData>, JanusGraphOperationStatus> getDataTypes, final String modelName) {
        if (getDataTypes.isRight() && getDataTypes.right().value() == JanusGraphOperationStatus.NOT_FOUND) {
            return Collections.emptyList();
        }
        if (getDataTypes.isRight()) {
            final var status = getDataTypes.right().value();
            if (LOGGER.isErrorEnabled()) {
                final var errorMsg= String.format("Failed to fetch data types from database with model %s. Status is %s", modelName, status);
                LOGGER.error(String.valueOf(EcompLoggerErrorCode.UNKNOWN_ERROR), DataTypeOperation.class.getName(), errorMsg);
                BeEcompErrorManager.getInstance().logInternalConnectionError(DataTypeOperation.class.getName(), errorMsg, ErrorSeverity.ERROR);
            }
            return Collections.emptyList();
        }
        return getDataTypes.left().value();
    }

    public Map<String, Map<String, DataTypeDefinition>> mapDataTypesDefinitionByModel(final Map<String, DataTypeDefinition> allDataTypes) {
        final Map<String, DataTypeDefinition> dataTypesWithNullModelMap = new HashMap<>();
        final Map<String, DataTypeDefinition> dataTypesWithModelMap = new HashMap<>();
        final Map<String, Map<String, DataTypeDefinition>> dataTypesMappedByModel = new HashMap<>();
        allDataTypes.values().stream().forEach(dataTypeDefinition -> {
            final var model = dataTypeDefinition.getModel();
            final var dataTypeDefinitionName = dataTypeDefinition.getName();
            if (model == null) {
                dataTypesWithNullModelMap.put(dataTypeDefinitionName, dataTypeDefinition);
            } else {
                dataTypesWithModelMap.put(dataTypeDefinitionName, dataTypeDefinition);
                if (dataTypesMappedByModel.containsKey(model)) {
                    dataTypesMappedByModel.get(model).put(dataTypeDefinitionName, dataTypeDefinition);
                } else {
                    dataTypesMappedByModel.put(model, dataTypesWithModelMap);
                }
            }
        });
        if(MapUtils.isNotEmpty(dataTypesWithNullModelMap)) {
            dataTypesMappedByModel.put(null, dataTypesWithNullModelMap);
        }
        return dataTypesMappedByModel;
    }

}