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 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you 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.elasticsearch.rest.action.cat;

import org.elasticsearch.action.admin.cluster.node.info.NodeInfo;
import org.elasticsearch.action.admin.cluster.node.info.NodesInfoRequest;
import org.elasticsearch.action.admin.cluster.node.info.NodesInfoResponse;
import org.elasticsearch.action.admin.cluster.state.ClusterStateRequest;
import org.elasticsearch.action.admin.cluster.state.ClusterStateResponse;
import org.elasticsearch.client.node.NodeClient;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import org.elasticsearch.common.Table;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.plugins.PluginInfo;
import org.elasticsearch.rest.RestController;
import org.elasticsearch.rest.RestRequest;
import org.elasticsearch.rest.RestResponse;
import org.elasticsearch.rest.action.RestActionListener;
import org.elasticsearch.rest.action.RestResponseListener;

import static org.elasticsearch.rest.RestRequest.Method.GET;

public class RestPluginsAction extends AbstractCatAction {

    @Inject
    public RestPluginsAction(Settings settings, RestController controller) {
        super(settings);
        controller.registerHandler(GET, "/_cat/plugins", this);
    }

    @Override
    protected void documentation(StringBuilder sb) {
        sb.append("/_cat/plugins\n");
    }

    @Override
    public RestChannelConsumer doCatRequest(final RestRequest request, final NodeClient client) {
        final ClusterStateRequest clusterStateRequest = new ClusterStateRequest();
        clusterStateRequest.clear().nodes(true);
        clusterStateRequest.local(request.paramAsBoolean("local", clusterStateRequest.local()));
        clusterStateRequest.masterNodeTimeout(request.paramAsTime("master_timeout", clusterStateRequest.masterNodeTimeout()));

        return channel -> client.admin().cluster().state(clusterStateRequest, new RestActionListener<ClusterStateResponse>(channel) {
            @Override
            public void processResponse(final ClusterStateResponse clusterStateResponse) throws Exception {
                NodesInfoRequest nodesInfoRequest = new NodesInfoRequest();
                nodesInfoRequest.clear().plugins(true);
                client.admin().cluster().nodesInfo(nodesInfoRequest, new RestResponseListener<NodesInfoResponse>(channel) {
                    @Override
                    public RestResponse buildResponse(final NodesInfoResponse nodesInfoResponse) throws Exception {
                        return RestTable.buildResponse(buildTable(request, clusterStateResponse, nodesInfoResponse), channel);
                    }
                });
            }
        });
    }

    @Override
    protected Table getTableWithHeader(final RestRequest request) {
        Table table = new Table();
        table.startHeaders();
        table.addCell("id", "default:false;desc:unique node id");
        table.addCell("name", "alias:n;desc:node name");
        table.addCell("component", "alias:c;desc:component");
        table.addCell("version", "alias:v;desc:component version");
        table.addCell("description", "alias:d;default:false;desc:plugin details");
        table.endHeaders();
        return table;
    }

    private Table buildTable(RestRequest req, ClusterStateResponse state, NodesInfoResponse nodesInfo) {
        DiscoveryNodes nodes = state.getState().nodes();
        Table table = getTableWithHeader(req);

        for (DiscoveryNode node : nodes) {
            NodeInfo info = nodesInfo.getNodesMap().get(node.getId());

            for (PluginInfo pluginInfo : info.getPlugins().getPluginInfos()) {
                table.startRow();
                table.addCell(node.getId());
                table.addCell(node.getName());
                table.addCell(pluginInfo.getName());
                table.addCell(pluginInfo.getVersion());
                table.addCell(pluginInfo.getDescription());
                table.endRow();
            }
        }

        return table;
    }
}
