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/*-
 * ============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.onap.policy.clamp.controlloop.models.controlloop.persistence.provider;

import java.time.Instant;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import javax.ws.rs.core.Response.Status;
import lombok.AllArgsConstructor;
import lombok.NonNull;
import org.onap.policy.clamp.controlloop.models.controlloop.concepts.ParticipantStatistics;
import org.onap.policy.clamp.controlloop.models.controlloop.persistence.concepts.JpaParticipantStatistics;
import org.onap.policy.clamp.controlloop.models.controlloop.persistence.repository.ParticipantStatisticsRepository;
import org.onap.policy.models.base.PfModelException;
import org.onap.policy.models.base.PfTimestampKey;
import org.onap.policy.models.dao.PfFilterParameters;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

/**
 * This class provides the provision of information on participant statistics in the database to callers.
 */
@Service
@Transactional
@AllArgsConstructor
public class ParticipantStatisticsProvider {

    private ParticipantStatisticsRepository participantStatisticsRepository;

    /**
     * Get Participant statistics.
     *
     * @param name the name of the participant statistics to get, null to get all stats
     * @param version the version of the participant statistics to get, null to get all stats for a name
     * @param timestamp the time stamp for the stats to get
     * @return the participant statistics found
     */
    @Transactional(readOnly = true)
    public List<ParticipantStatistics> getParticipantStatistics(final String name, final String version,
            final Instant timestamp) {
        if (name != null && version != null && timestamp != null) {
            return asParticipantStatisticsList(
                    participantStatisticsRepository.findAllById(List.of(new PfTimestampKey(name, version, timestamp))));
        } else if (name != null) {
            return getFilteredParticipantStatistics(name, version, timestamp, null, null, "DESC", 0);
        }
        return asParticipantStatisticsList(participantStatisticsRepository.findAll());
    }

    /**
     * Get filtered participant statistics.
     *
     * @param name the participant name for the statistics to get
     * @param version the participant version for the statistics to get
     * @param startTimeStamp startTimeStamp to filter statistics
     * @param endTimeStamp endTimeStamp to filter statistics
     * @param sortOrder sortOrder to query database
     * @param getRecordNum Total query count from database
     * @param filterMap the filters to apply to the get operation
     * @return the participant statistics found
     */
    @Transactional(readOnly = true)
    public List<ParticipantStatistics> getFilteredParticipantStatistics(final String name, final String version,
            final Instant startTimeStamp, final Instant endTimeStamp, Map<String, Object> filterMap,
            final String sortOrder, final int getRecordNum) {

        // @formatter:off
        PfFilterParameters filterParams = PfFilterParameters
                .builder()
                .name(name)
                .version(version)
                .startTime(startTimeStamp)
                .endTime(endTimeStamp)
                .filterMap(filterMap)
                .sortOrder(sortOrder)
                .recordNum(getRecordNum)
                .build();
        // @formatter:on

        return asParticipantStatisticsList(
                participantStatisticsRepository.getFiltered(JpaParticipantStatistics.class, filterParams));
    }

    /**
     * Creates Participant statistics.
     *
     * @param participantStatisticsList a specification of the CL statistics to create
     * @return the participant statistics created
     * @throws PfModelException on errors creating participant statistics
     */
    public List<ParticipantStatistics> createParticipantStatistics(
            @NonNull final List<ParticipantStatistics> participantStatisticsList) throws PfModelException {

        try {
            var jpaParticipantStatisticsList = ProviderUtils.getJpaAndValidateList(participantStatisticsList,
                    JpaParticipantStatistics::new, "Participant Statistics");

            var jpaParticipantStatisticsSaved = participantStatisticsRepository.saveAll(jpaParticipantStatisticsList);

            // Return the saved participant statistics
            return asParticipantStatisticsList(jpaParticipantStatisticsSaved);
        } catch (IllegalArgumentException e) {
            throw new PfModelException(Status.BAD_REQUEST, "Error in save participant statistics", e);
        }
    }

    /**
     * Convert JPA participant statistics list to participant statistics list.
     *
     * @param jpaParticipantStatisticsList the list to convert
     * @return the participant statistics list
     */
    private List<ParticipantStatistics> asParticipantStatisticsList(
            List<JpaParticipantStatistics> jpaParticipantStatisticsList) {

        return jpaParticipantStatisticsList.stream().map(JpaParticipantStatistics::toAuthorative)
                .collect(Collectors.toList());
    }
}