package org.onlab.onos.cli;

import org.apache.karaf.shell.commands.Command;
import org.onlab.onos.cluster.ClusterService;
import org.onlab.onos.cluster.ControllerNode;

import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import static com.google.common.collect.Lists.newArrayList;

/**
 * Lists all controller cluster nodes.
 */
@Command(scope = "onos", name = "nodes",
         description = "Lists all controller cluster nodes")
public class NodesListCommand extends AbstractShellCommand {

    private static final String FMT =
            "id=%s, ip=%s, state=%s %s";

    protected static final Comparator<ControllerNode> ID_COMPARATOR =
            new Comparator<ControllerNode>() {
        @Override
        public int compare(ControllerNode ci1, ControllerNode ci2) {
            return ci1.id().toString().compareTo(ci2.id().toString());
        }
    };

    @Override
    protected Object doExecute() throws Exception {
        ClusterService service = getService(ClusterService.class);
        List<ControllerNode> nodes = newArrayList(service.getNodes());
        Collections.sort(nodes, ID_COMPARATOR);
        ControllerNode self = service.getLocalNode();
        for (ControllerNode node : nodes) {
            print(FMT, node.id(), node.ip(),
                  service.getState(node.id()),
                  node.equals(self) ? "*" : "");
        }
        return null;
    }

}