/*
    * Copyright (c) 2015 Cisco Systems, Inc.  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.lispflowmapping.implementation.util;
   
  import org.opendaylight.lispflowmapping.lisp.util.LispAddressStringifier;
  import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.lisp.address.types.rev151105.lisp.address.Address;
  import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.lisp.address.types.rev151105.lisp.address.address.InstanceId;
  import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.eid.container.Eid;
  import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.mappingservice.rev150906.EidUri;
  import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.mappingservice.rev150906.VniUri;
  import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.mappingservice.rev150906.MappingDatabase;
  import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.mappingservice.rev150906.MappingOrigin;
  import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.mappingservice.rev150906.db.instance.AuthenticationKey;
  import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.mappingservice.rev150906.db.instance.AuthenticationKeyKey;
  import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.mappingservice.rev150906.db.instance.Mapping;
  import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.mappingservice.rev150906.db.instance.MappingKey;
  import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.mappingservice.rev150906.mapping.database.VirtualNetworkIdentifier;
  import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.mappingservice.rev150906.mapping.database.VirtualNetworkIdentifierKey;
  import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  
  import com.google.common.base.Preconditions;
  
  /**
   * Utility class to create InstanceIdentifier path objects based on EID.
   * Used for storing RPC data to the config datastore.
   *
   * @author Lorand Jakab
   *
   */
  public final class InstanceIdentifierUtil {
      // Utility class, should not be instantiated
      private InstanceIdentifierUtil() {
      }
  
      public static InstanceIdentifier<AuthenticationKey> createAuthenticationKeyIid(Eid eid) {
          Preconditions.checkNotNull(eid, "Key needs and EID entry!");
  
          VirtualNetworkIdentifierKey vniKey = new VirtualNetworkIdentifierKey(new VniUri(Long.toString(getLispInstanceId(eid))));
          AuthenticationKeyKey authKeyKey = new AuthenticationKeyKey(new EidUri(getURIAddressString(eid)));
          return InstanceIdentifier.create(MappingDatabase.class)
                  .child(VirtualNetworkIdentifier.class, vniKey).child(AuthenticationKey.class, authKeyKey);
      }
  
      public static InstanceIdentifier<Mapping> createMappingIid(Eid eid, MappingOrigin orig) {
          Preconditions.checkNotNull(eid, "Mapping needs an EID entry!");
  
          VirtualNetworkIdentifierKey vniKey = new VirtualNetworkIdentifierKey(new VniUri(Long.toString(getLispInstanceId(eid))));
          MappingKey eidKey = new MappingKey(new EidUri(getURIAddressString(eid)), orig);
          return InstanceIdentifier.create(MappingDatabase.class)
                  .child(VirtualNetworkIdentifier.class, vniKey).child(Mapping.class, eidKey);
      }
  
      private static long getLispInstanceId(Eid eid) {
          Address address = eid.getAddress();
          if (address instanceof InstanceId) {
              return ((InstanceId) address).getInstanceId().getIid().getValue();
          } else if (eid.getVirtualNetworkId() != null) {
              return eid.getVirtualNetworkId().getValue();
          }
          return 0L;
      }
  
      private static String getURIAddressString(Eid eid) {
          return LispAddressStringifier.getURIString(eid);
      }
  }