/*
 * Copyright (c) 2015 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.interfacemgr.servicebindings.flowbased.statehelpers;

import com.google.common.util.concurrent.ListenableFuture;
import org.opendaylight.controller.md.sal.binding.api.DataBroker;
import org.opendaylight.controller.md.sal.binding.api.WriteTransaction;
import org.opendaylight.vpnservice.interfacemgr.IfmUtil;
import org.opendaylight.vpnservice.interfacemgr.commons.InterfaceManagerCommonUtils;
import org.opendaylight.vpnservice.interfacemgr.servicebindings.flowbased.utilities.FlowBasedServicesUtils;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.InterfaceKey;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.state.Interface;
import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.NodeConnectorId;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.servicebinding.rev151015.service.bindings.ServicesInfo;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.servicebinding.rev151015.service.bindings.services.info.BoundServices;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.math.BigInteger;
import java.util.ArrayList;
import java.util.List;

public class FlowBasedServicesStateUnbindHelper {
    private static final Logger LOG = LoggerFactory.getLogger(FlowBasedServicesStateUnbindHelper.class);

    public static List<ListenableFuture<Void>> unbindServicesFromInterface(Interface ifaceState,
                                                                           DataBroker dataBroker) {
        List<ListenableFuture<Void>> futures = new ArrayList<>();
        WriteTransaction t = dataBroker.newWriteOnlyTransaction();

        ServicesInfo servicesInfo = FlowBasedServicesUtils.getServicesInfoForInterface(ifaceState.getName(), dataBroker);
        if (servicesInfo == null) {
            return futures;
        }

        List<BoundServices> allServices = servicesInfo.getBoundServices();
        if (allServices == null || allServices.isEmpty()) {
            return futures;
        }

        BoundServices highestPriorityBoundService = null;
        short highestPriority = 0xFF;
        for (BoundServices boundService : allServices) {
            if (boundService.getServicePriority() < highestPriority) {
                highestPriorityBoundService = boundService;
                highestPriority = boundService.getServicePriority();
            }
        }

        InterfaceKey interfaceKey = new InterfaceKey(ifaceState.getName());
        org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.interfaces.rev140508.interfaces.Interface iface =
                InterfaceManagerCommonUtils.getInterfaceFromConfigDS(interfaceKey, dataBroker);

        NodeConnectorId nodeConnectorId = FlowBasedServicesUtils.getNodeConnectorIdFromInterface(iface, dataBroker);
        if(nodeConnectorId == null){
            return futures;
        }
        BigInteger dpId = new BigInteger(IfmUtil.getDpnFromNodeConnectorId(nodeConnectorId));
        FlowBasedServicesUtils.removeIngressFlow(iface, highestPriorityBoundService, dpId,
                dataBroker, t);

        for (BoundServices boundService : allServices) {
            if (!boundService.equals(highestPriorityBoundService)) {
                FlowBasedServicesUtils.removeLPortDispatcherFlow(dpId, iface, boundService, dataBroker, t);
            }
        }

        return futures;
    }
}