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// Copyright 2015-2024 Nstream, inc.
//
// Licensed under the Redis Source Available License 2.0 (RSALv2) Agreement;
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://redis.com/legal/rsalv2-agreement/
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package nstream.adapter.common.patches;

import nstream.adapter.common.NstreamAgent;
import swim.api.SwimLane;
import swim.api.lane.CommandLane;
import swim.api.lane.JoinValueLane;
import swim.structure.Value;
import swim.uri.Uri;

public class GroupPatch extends NstreamAgent {

  public GroupPatch() {
    super();
  }

  protected Value extractKeyFromValue(final Value value) {
    return value.get("uri");
  }

  protected String extractMemberLaneFromValue(final Value value) {
    return value.get("memberLane").stringValue(null);
  }

  @SwimLane("agents")
  protected JoinValueLane agents = this.joinValueLane()
          .didUpdate((k, n, o) -> {
            trace("(GroupPatch) " + nodeUri() + ".agents#didUpdate(): "
                    + "key=" + k + ", newValue=" + n + ", oldValue=" + o);
          });

  @SwimLane("joinGroup")
  protected CommandLane joinGroup = this.commandLane()
          .onCommand(v -> {
            trace("(GroupPatch) " + nodeUri()
                    + ".joinGroup#onCommand(): value=" + v);
            final Value key = extractKeyFromValue(v);
            final String lane = extractMemberLaneFromValue(v);
            this.agents.downlink(key)
                    .nodeUri(Uri.form().cast(key))
                    .laneUri(lane)
                    .open();
          });

  @SwimLane("leaveGroup")
  protected CommandLane leaveGroup = this.commandLane()
          .onCommand(v -> {
            trace("(GroupPatch) " + nodeUri()
                    + ".leaveGroup#onCommand(): value=" + v);
            final Value key = extractKeyFromValue(v);
            this.agents.remove(key);
          });

  @Override
  public void didStart() {
    info("(GroupPatch) " + nodeUri() + ": didStart");
  }

}