/*******************************************************************************
 *  ============LICENSE_START=======================================================
 *  slice-analysis-ms
 *  ================================================================================
 *   Copyright (C) 2020-2022 Wipro Limited.
 *   ==============================================================================
 *     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.onap.slice.analysis.ms.service;

import java.util.List;
import java.util.Objects;

import org.onap.slice.analysis.ms.configdb.IConfigDbService;
import org.onap.slice.analysis.ms.cps.CpsInterface;
import org.onap.slice.analysis.ms.models.Configuration;
import org.onap.slice.analysis.ms.models.SubCounter;
import org.onap.slice.analysis.ms.utils.BeanUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * This Thread class consumes message from pm data queue and sends onset message to policy
 */
public class ConsumerThread extends Thread {
    private static Logger log = LoggerFactory.getLogger(ConsumerThread.class);
    private PmDataQueue pmDataQueue;
    private IConfigDbService configDbService;
    private SnssaiSamplesProcessor snssaiSamplesProcessor;
    private CpsInterface cpsInterface;
    private long initialDelaySec;
    private int samples;

    /**
     * Default constructor.
     */
    public ConsumerThread() {
        super();
        this.pmDataQueue = BeanUtil.getBean(PmDataQueue.class);
        this.configDbService = BeanUtil.getBean(IConfigDbService.class);
        this.initialDelaySec = Configuration.getInstance().getInitialDelaySeconds();
        this.samples = Configuration.getInstance().getSamples();
        this.cpsInterface = BeanUtil.getBean(CpsInterface.class);
    }

    /**
     * Consumes data from PM data queue, process the data and sends onset message to policy if needed
     */
    @Override
    public void run() {
        Boolean isConfigDbEnabled = (Objects.isNull(Configuration.getInstance().getConfigDbEnabled())) ? true
                : Configuration.getInstance().getConfigDbEnabled();
        boolean done = false;
        boolean result = false;
        String snssai = "";
        List<String> nfs = null;
        while (!done) {
            try {
                Thread.sleep(initialDelaySec);
                log.info("Starting Consumer Thread");
                snssai = pmDataQueue.getSnnsaiFromQueue();
                if (!snssai.equals("")) {
                    log.info("Consumer thread processing data for s-nssai {}", snssai);
                    try {
                        if (isConfigDbEnabled) {
                            nfs = configDbService.fetchNetworkFunctionsOfSnssai(snssai);
                        } else {
                            nfs = cpsInterface.fetchNetworkFunctionsOfSnssai(snssai);
                        }
                    } catch (Exception e) {
                        pmDataQueue.putSnssaiToQueue(snssai);
                        log.error("Exception caught while fetching nfs of snssai {}, {}", snssai, e.getMessage());
                    }
                    if (nfs != null && checkForEnoughSamples(nfs, snssai)) {
                        this.snssaiSamplesProcessor = BeanUtil.getBean(SnssaiSamplesProcessor.class);
                        result = snssaiSamplesProcessor.processSamplesOfSnnsai(snssai, nfs);
                        if (!result) {
                            log.info("Not enough samples to process for {}", snssai);
                            pmDataQueue.putSnssaiToQueue(snssai);
                        }
                    }
                }
            } catch (Exception e) {
                log.error("Exception in Consumer Thread, {}", e.getMessage());
                done = true;
            }
        }
    }

    /**
     * Checks whether enough samples are available for the network functions
     */
    public boolean checkForEnoughSamples(List<String> nfs, String snssai) {
        for (String nf : nfs) {
            if (!pmDataQueue.checkSamplesInQueue(new SubCounter(nf, snssai), samples)) {
                log.info("Not enough samples to process for network function {} of snssai {}", nf, snssai);
                pmDataQueue.putSnssaiToQueue(snssai);
                return false;
            }
        }
        return true;
    }
}