/*
 * Copyright (c) 2015 Brocade Communications Systems, Inc. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */
package org.opendaylight.controller.clustering.it.provider;

import com.google.common.base.Stopwatch;
import com.google.common.util.concurrent.Futures;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicLong;
import org.opendaylight.controller.md.sal.binding.api.DataBroker;
import org.opendaylight.controller.md.sal.binding.api.WriteTransaction;
import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
import org.opendaylight.controller.md.sal.common.api.data.TransactionCommitFailedException;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.config.sal.clustering.it.car.rev140818.CarId;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.config.sal.clustering.it.car.rev140818.CarService;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.config.sal.clustering.it.car.rev140818.Cars;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.config.sal.clustering.it.car.rev140818.CarsBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.config.sal.clustering.it.car.rev140818.StressTestInput;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.config.sal.clustering.it.car.rev140818.cars.CarEntry;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.controller.config.sal.clustering.it.car.rev140818.cars.CarEntryBuilder;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.opendaylight.yangtools.yang.common.RpcResult;
import org.opendaylight.yangtools.yang.common.RpcResultBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Thomas Pantelis
 */
public class CarProvider implements CarService {
    private static final Logger log = LoggerFactory.getLogger(PurchaseCarProvider.class);

    private final DataBroker dataProvider;

    private volatile Thread testThread;
    private volatile boolean stopThread;

    public CarProvider(DataBroker dataProvider) {
        this.dataProvider = dataProvider;
    }

    private void stopThread() {
        if(testThread != null) {
            stopThread = true;
            testThread.interrupt();
            try {
                testThread.join();
            } catch (InterruptedException e) {}
            testThread = null;
        }
    }

    @Override
    public Future<RpcResult<Void>> stressTest(StressTestInput input) {
        log.info("stressTest starting : rate: {}", input.getRate());

        stopThread();

        WriteTransaction tx = dataProvider.newWriteOnlyTransaction();
        InstanceIdentifier<Cars> carsId = InstanceIdentifier.<Cars>builder(Cars.class).build();
        tx.merge(LogicalDatastoreType.CONFIGURATION, carsId, new CarsBuilder().build());
        try {
            tx.submit().checkedGet(5, TimeUnit.SECONDS);
        } catch (TransactionCommitFailedException | TimeoutException e) {
            log.error("Put Cars failed",e);
            return Futures.immediateFuture(RpcResultBuilder.<Void>success().build());
        }

        stopThread = false;
        final long sleep = TimeUnit.NANOSECONDS.convert(1000,TimeUnit.MILLISECONDS) / input.getRate();
        final Stopwatch sw = Stopwatch.createUnstarted();
        testThread = new Thread() {
            @Override
            public void run() {
                sw.start();
                AtomicLong count = new AtomicLong();
                while(!stopThread) {
                    long id = count.incrementAndGet();
                    WriteTransaction tx = dataProvider.newWriteOnlyTransaction();
                    CarEntry car = new CarEntryBuilder().setId(new CarId("car"+id)).build();
                    tx.put(LogicalDatastoreType.CONFIGURATION,
                            InstanceIdentifier.<Cars>builder(Cars.class).child(CarEntry.class, car.getKey()).build(),
                            car);
                    tx.submit();
                    try {
                        TimeUnit.NANOSECONDS.sleep(sleep);
                    } catch (InterruptedException e) {
                        break;
                    }

                    if((count.get() % 1000) == 0) {
                        log.info("Cars created {}, time: {}",count.get(),sw.elapsed(TimeUnit.SECONDS));
                    }
                }

                log.info("Stress test thread stopping");
            }
        };
        testThread.start();

        return Futures.immediateFuture(RpcResultBuilder.<Void>success().build());
    }

    @Override
    public Future<RpcResult<Void>> stopStressTest() {
        stopThread();
        return Futures.immediateFuture(RpcResultBuilder.<Void>success().build());
    }

}