/*
 * Copyright 2019-present Open Networking Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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 org.onosproject.k8snode.cli;

import org.apache.karaf.shell.api.action.lifecycle.Service;
import org.apache.karaf.shell.api.console.CommandLine;
import org.apache.karaf.shell.api.console.Completer;
import org.apache.karaf.shell.api.console.Session;
import org.apache.karaf.shell.support.completers.StringsCompleter;
import org.onosproject.k8snode.api.K8sNode;
import org.onosproject.k8snode.api.K8sNodeService;

import java.util.List;
import java.util.Set;
import java.util.SortedSet;
import java.util.stream.Collectors;

import static org.onosproject.cli.AbstractShellCommand.get;

/**
 * Kubernetes host completer.
 */
@Service
public class K8sHostnameCompleter implements Completer {
    @Override
    public int complete(Session session, CommandLine commandLine, List<String> candidates) {
        StringsCompleter delegate = new StringsCompleter();
        K8sNodeService nodeService = get(K8sNodeService.class);

        Set<String> hostnames = nodeService.nodes().stream()
                .map(K8sNode::hostname)
                .collect(Collectors.toSet());
        SortedSet<String> strings = delegate.getStrings();

        strings.addAll(hostnames);

        return delegate.complete(session, commandLine, candidates);
    }
}