/*
 * Copyright (c) 2016 Ericsson India Global Services Pvt Ltd. 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.vpnservice.elan.statisitcs;

import com.google.common.util.concurrent.Futures;
import org.opendaylight.controller.md.sal.binding.api.DataBroker;
import org.opendaylight.vpnservice.elan.utils.ElanConstants;
import org.opendaylight.vpnservice.elan.utils.ElanUtils;
//import org.opendaylight.vpnservice.ericsson.mdsalutil.statistics.StatValue;
//import org.opendaylight.vpnservice.ericsson.mdsalutil.statistics.StatisticsInfo;
import org.opendaylight.vpnservice.interfacemgr.exceptions.InterfaceNotFoundException;
import org.opendaylight.vpnservice.interfacemgr.exceptions.InterfaceServiceNotFoundException;
import org.opendaylight.vpnservice.interfacemgr.globals.IfmConstants;
import org.opendaylight.vpnservice.interfacemgr.globals.InterfaceInfo;
import org.opendaylight.vpnservice.interfacemgr.globals.InterfaceServiceUtil;
import org.opendaylight.vpnservice.interfacemgr.globals.VlanInterfaceInfo;
import org.opendaylight.vpnservice.interfacemgr.interfaces.IInterfaceManager;
import org.opendaylight.vpnservice.mdsalutil.MatchInfo;
import org.opendaylight.vpnservice.mdsalutil.interfaces.IMdsalApiManager;
//import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice._interface.service.rev150602._interface.service.info.ServiceInfo;
import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice._interface.statistics.rev150824.ResultCode;
import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.rev150602.elan.instances.ElanInstance;
import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.rev150602.elan.interfaces.ElanInterface;
import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.statistics.rev150824.ElanStatisticsService;
import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.statistics.rev150824.GetElanInterfaceStatisticsInput;
import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.statistics.rev150824.GetElanInterfaceStatisticsOutput;
import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.statistics.rev150824.GetElanInterfaceStatisticsOutputBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.statistics.rev150824.get.elan._interface.statistics.output.StatResultBuilder;
import org.opendaylight.yangtools.yang.common.RpcError.ErrorType;
import org.opendaylight.yangtools.yang.common.RpcResult;
import org.opendaylight.yangtools.yang.common.RpcResultBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.servicebinding.rev151015.service.bindings.ServicesInfo;

import java.math.BigInteger;
import java.util.List;
import java.util.Set;
import java.util.concurrent.Future;

public class ElanStatisticsImpl implements ElanStatisticsService {
    private DataBroker dataBroker;
    private IInterfaceManager interfaceManager;
    private IMdsalApiManager mdsalMgr;
    private static final Logger logger = LoggerFactory.getLogger(ElanStatisticsImpl.class);

    public ElanStatisticsImpl(DataBroker dataBroker, IInterfaceManager interfaceManager,
            IMdsalApiManager mdsalMgr) {
        this.interfaceManager = interfaceManager;
        this.dataBroker = dataBroker;
        this.mdsalMgr = mdsalMgr;
    }

    @Override
    public Future<RpcResult<GetElanInterfaceStatisticsOutput>> getElanInterfaceStatistics(
            GetElanInterfaceStatisticsInput input) {
        String interfaceName = input.getInterfaceName();
        logger.debug("getElanInterfaceStatistics is called for elan interface {}", interfaceName);
        RpcResultBuilder<GetElanInterfaceStatisticsOutput> rpcResultBuilder = null;
        if (interfaceName == null) {
            rpcResultBuilder = RpcResultBuilder.failed();
            return getFutureWithAppErrorMessage(rpcResultBuilder, "Interface name is not provided");
        }
        ElanInterface elanInterface = ElanUtils.getElanInterfaceByElanInterfaceName(interfaceName);
        if (elanInterface == null) {
            rpcResultBuilder = RpcResultBuilder.failed();
            return getFutureWithAppErrorMessage(rpcResultBuilder, String.format("Interface %s is not a ELAN interface", interfaceName));
        }
        String elanInstanceName = elanInterface.getElanInstanceName();
        ElanInstance elanInfo = ElanUtils.getElanInstanceByName(elanInstanceName);
        long elanTag = elanInfo.getElanTag();
        InterfaceInfo interfaceInfo = interfaceManager.getInterfaceInfo(interfaceName);
        ServicesInfo serviceInfo = ElanUtils.getServiceInfo(elanInstanceName, elanTag, interfaceName);
        //FIXME [ELANBE] Get this API Later
        short tableId = 0;
//        try {
//
//            //tableId = interfaceManager.getTableIdForService(interfaceName, serviceInfo);
//        } catch (InterfaceNotFoundException | InterfaceServiceNotFoundException e) {
//            rpcResultBuilder = RpcResultBuilder.failed();
//            return getFutureWithAppErrorMessage(rpcResultBuilder, String.format("Interface %s or Service %s doesn't exist", interfaceName, serviceInfo));
//        }
        if (!interfaceInfo.isOperational()) {
            logger.debug("interface {} is down and returning with no statistics", interfaceName);
            rpcResultBuilder = RpcResultBuilder.success();
            return Futures.immediateFuture(rpcResultBuilder.withResult(new GetElanInterfaceStatisticsOutputBuilder().setStatResult(new StatResultBuilder()
            .setStatResultCode(ResultCode.NotFound).setByteRxCount(0L).setByteTxCount(0L).setPacketRxCount(0L)
            .setPacketTxCount(0L).build()).build()).build());
        }
        rpcResultBuilder = RpcResultBuilder.success();
        return Futures.immediateFuture(rpcResultBuilder.withResult(queryforElanInterfaceStatistics(tableId, elanInstanceName, interfaceInfo)).build());
    }

    private GetElanInterfaceStatisticsOutput queryforElanInterfaceStatistics(short tableId, String elanInstanceName, InterfaceInfo interfaceInfo) {
        BigInteger dpId = interfaceInfo.getDpId();
        List<MatchInfo> matches = null;
        String interfaceName = interfaceInfo.getInterfaceName();
        if (tableId == IfmConstants.VLAN_INTERFACE_INGRESS_TABLE) {
            VlanInterfaceInfo vlanInterfaceInfo = (VlanInterfaceInfo)interfaceInfo;
            matches = InterfaceServiceUtil.getMatchInfoForVlanLPort(dpId, interfaceInfo.getPortNo(),
                    InterfaceServiceUtil.getVlanId(interfaceName, dataBroker), vlanInterfaceInfo.isVlanTransparent());
        } else {
            matches = InterfaceServiceUtil.getLPortDispatcherMatches(ElanConstants.ELAN_SERVICE_INDEX, interfaceInfo.getInterfaceTag());
        }
        long groupId = interfaceInfo.getGroupId();
        Set<Object> statRequestKeys = InterfaceServiceUtil.getStatRequestKeys(dpId, tableId, matches, String.format("%s.%s", elanInstanceName, interfaceName), groupId);
       // StatisticsInfo statsInfo = new StatisticsInfo(statRequestKeys);
//        org.opendaylight.vpnservice.ericsson.mdsalutil.statistics.StatResult statResult = mdsalMgr.queryForStatistics(interfaceName, statsInfo);
//        ResultCode resultCode = ResultCode.Success;
//        if (!statResult.isComplete()) {
//            resultCode = ResultCode.Incomplete;
//        }

        //StatValue ingressFlowStats = statResult.getStatResult(InterfaceServiceUtil.getFlowStatisticsKey(dpId, tableId, matches, elanInstanceName));
        //StatValue groupStats = statResult.getStatResult(InterfaceServiceUtil.getGroupStatisticsKey(dpId, groupId));
//        return new GetElanInterfaceStatisticsOutputBuilder().setStatResult(new StatResultBuilder().setStatResultCode(resultCode)
//                .setByteRxCount(ingressFlowStats.getByteCount()).setPacketRxCount(ingressFlowStats.getPacketCount())
//                .setByteTxCount(groupStats.getByteCount()).setPacketTxCount(groupStats.getPacketCount()).build()).build();
        return null;
    }

    private Future<RpcResult<GetElanInterfaceStatisticsOutput>> getFutureWithAppErrorMessage(
            RpcResultBuilder<GetElanInterfaceStatisticsOutput> rpcResultBuilder, String message) {
        rpcResultBuilder.withError(ErrorType.APPLICATION, message);
        return Futures.immediateFuture(rpcResultBuilder.build());
    }

}