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/*
 * Copyright (c) 2017 Cisco 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.neutron.hostconfig.vpp;

import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
import com.google.gson.JsonArray;
import com.google.gson.JsonObject;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NodeId;

public final class HostconfigUtil {

    static final String L2_HOST_TYPE = "ODL L2";
    private static final String VHOST_USER = "vhostuser";
    private static final String VNIC_TYPE = "normal";
    private static final String HAS_DATAPATH_TYPE_NETDEV = "False";
    private static final String SUPPORT_VHOST_USER = "True";
    private static final List SUPPORTED_NET_TYPES = Lists.newArrayList("local", "vlan", "vxlan", "gre");

    private HostconfigUtil() {
    }

    public static Map createHostconfigsDataFor(NodeId nodeId, SocketInfo socketInfo) {
        Preconditions.checkNotNull(nodeId);
        Preconditions.checkNotNull(socketInfo);
        JsonObject odlL2 = new JsonObject();
        odlL2.add("allowed_network_types", buildSupportedNetworkTypes());
        odlL2.add("supported_vnic_types", buildSupportedVnicTypes(socketInfo));
        Map hostConfigs = new HashMap<>();
        hostConfigs.put(L2_HOST_TYPE, odlL2.toString());
        return hostConfigs;
    }

    private static JsonArray buildSupportedNetworkTypes() {
        JsonArray networkTypes = new JsonArray();
        SUPPORTED_NET_TYPES.forEach(networkTypes::add);
        return networkTypes;
    }

    private static JsonArray buildSupportedVnicTypes(SocketInfo socketInfo) {
        JsonObject supportedVnicType = new JsonObject();
        supportedVnicType.addProperty("vnic_type", VNIC_TYPE);
        supportedVnicType.addProperty("vif_type", VHOST_USER);
        supportedVnicType.add("vif_details", buildVifDetails(socketInfo));
        JsonArray supportedVnicTypes = new JsonArray();
        supportedVnicTypes.add(supportedVnicType);
        return supportedVnicTypes;
    }

    private static JsonObject buildVifDetails(SocketInfo socketInfo) {
        JsonObject vifDetails = new JsonObject();
        vifDetails.addProperty("has_datapath_type_netdev", HAS_DATAPATH_TYPE_NETDEV);
        vifDetails.addProperty("support_vhost_user", SUPPORT_VHOST_USER);
        vifDetails.addProperty("port_prefix", socketInfo.getSocketPrefix());
        vifDetails.addProperty("vhostuser_socket_dir", socketInfo.getSocketPath());
        vifDetails.addProperty("vhostuser_mode", socketInfo.getVhostuserMode());
        vifDetails.addProperty("vhostuser_socket", socketInfo.getVhostUserSocket());
        return vifDetails;
    }
}