/*
 * Copyright (c) 2017 Red Hat, 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.netvirt.natservice.cli;

import java.io.PrintStream;
import java.math.BigInteger;
import java.util.Optional;
import org.apache.karaf.shell.commands.Command;
import org.apache.karaf.shell.console.OsgiCommandSupport;
import org.eclipse.jdt.annotation.NonNull;
import org.eclipse.jdt.annotation.Nullable;
import org.opendaylight.genius.datastoreutils.SingleTransactionDataBroker;
import org.opendaylight.mdsal.binding.api.DataBroker;
import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
import org.opendaylight.netvirt.natservice.internal.NatUtil;
import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.interfacemanager.meta.rev160406.BridgeRefInfo;
import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.interfacemanager.meta.rev160406.bridge.ref.info.BridgeRefEntry;
import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.interfacemanager.meta.rev160406.bridge.ref.info.BridgeRefEntryKey;
import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.natservice.rev160111.NaptSwitches;
import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.natservice.rev160111.napt.switches.RouterToNaptSwitch;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.rev150105.OvsdbBridgeAugmentation;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.rev150105.OvsdbNodeAugmentation;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.ovsdb.rev150105.ovsdb.node.attributes.OpenvswitchOtherConfigs;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;

@Command(scope = "odl", name = "display-napt-switches", description = "Display the napt switch for the routers.")
public class DisplayNaptSwithcesCli extends OsgiCommandSupport {

    private DataBroker dataBroker;
    private static final String LOCAL_IP = "local_ip";

    public void setDataBroker(DataBroker dataBroker) {
        this.dataBroker = dataBroker;
    }

    @Override
    @Nullable
    protected Object doExecute() {
        PrintStream ps = session.getConsole();
        Optional<NaptSwitches> npatSwitches = NatUtil.getAllPrimaryNaptSwitches(dataBroker);
        ps.printf(String.format(" %-36s  %-20s  %-20s %n", "Router Id ", "Datapath Node Id", "Managment Ip Address"));
        ps.printf("-------------------------------------------------------------------------------------------%n");
        if (npatSwitches.isPresent()) {
            for (RouterToNaptSwitch routerToNaptSwitch : npatSwitches.get().nonnullRouterToNaptSwitch().values()) {
                ps.printf(String.format(" %-36s  %-20s  %-20s %n", routerToNaptSwitch.getRouterName(),
                     routerToNaptSwitch.getPrimarySwitchId(),
                     getDpnLocalIp(routerToNaptSwitch.getPrimarySwitchId().toJava())));
            }
        }
        return null;
    }

    @SuppressWarnings("unchecked")
    private Optional<Node> getPortsNode(BigInteger dpnId) {
        InstanceIdentifier<BridgeRefEntry> bridgeRefInfoPath = InstanceIdentifier.create(BridgeRefInfo.class)
                .child(BridgeRefEntry.class, new BridgeRefEntryKey(dpnId));

        Optional<BridgeRefEntry> bridgeRefEntry =
                SingleTransactionDataBroker.syncReadOptionalAndTreatReadFailedExceptionAsAbsentOptional(dataBroker,
                        LogicalDatastoreType.OPERATIONAL, bridgeRefInfoPath);
        if (!bridgeRefEntry.isPresent()) {
            return Optional.empty();
        }

        InstanceIdentifier<Node> nodeId =
                bridgeRefEntry.get().getBridgeReference().getValue().firstIdentifierOf(Node.class);

        return SingleTransactionDataBroker.syncReadOptionalAndTreatReadFailedExceptionAsAbsentOptional(dataBroker,
                LogicalDatastoreType.OPERATIONAL, nodeId);
    }

    @Nullable
    private String getDpnLocalIp(BigInteger dpId) {
        return getPortsNode(dpId).map(node -> getOpenvswitchOtherConfig(node, LOCAL_IP)).orElse(null);
    }

    @Nullable
    private String getOpenvswitchOtherConfig(Node node, String key) {
        OvsdbNodeAugmentation ovsdbNode = node.augmentation(OvsdbNodeAugmentation.class);
        if (ovsdbNode == null) {
            Optional<Node> nodeFromReadOvsdbNode = readOvsdbNode(node);
            if (nodeFromReadOvsdbNode.isPresent()) {
                ovsdbNode = nodeFromReadOvsdbNode.get().augmentation(OvsdbNodeAugmentation.class);
            }
        }

        if (ovsdbNode != null && ovsdbNode.getOpenvswitchOtherConfigs() != null) {
            for (OpenvswitchOtherConfigs openvswitchOtherConfigs : ovsdbNode.getOpenvswitchOtherConfigs().values()) {
                if (key.equals(openvswitchOtherConfigs.getOtherConfigKey())) {
                    return openvswitchOtherConfigs.getOtherConfigValue();
                }
            }
        }

        return null;
    }

    @NonNull
    private Optional<Node> readOvsdbNode(Node bridgeNode) {
        OvsdbBridgeAugmentation bridgeAugmentation = extractBridgeAugmentation(bridgeNode);
        if (bridgeAugmentation != null) {
            InstanceIdentifier<Node> ovsdbNodeIid =
                    (InstanceIdentifier<Node>) bridgeAugmentation.getManagedBy().getValue();
            return SingleTransactionDataBroker.syncReadOptionalAndTreatReadFailedExceptionAsAbsentOptional(dataBroker,
                    LogicalDatastoreType.OPERATIONAL, ovsdbNodeIid);
        }
        return Optional.empty();

    }

    @Nullable
    private OvsdbBridgeAugmentation extractBridgeAugmentation(@Nullable Node node) {
        if (node == null) {
            return null;
        }
        return node.augmentation(OvsdbBridgeAugmentation.class);
    }

}