/*
 * Licensed to Crate under one or more contributor license agreements.
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.  Crate 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.
 *
 * However, if you have executed another commercial license agreement
 * with Crate these terms will supersede the license and you may use the
 * software solely pursuant to the terms of the relevant commercial
 * agreement.
 */

package io.crate.plugin;

import io.crate.Plugin;
import io.crate.module.SigarModule;
import io.crate.monitor.MonitorModule;
import io.crate.monitor.SigarExtendedNodeInfo;
import io.crate.monitor.SigarService;
import org.apache.logging.log4j.Logger;
import org.elasticsearch.common.inject.Module;
import org.elasticsearch.common.logging.Loggers;
import org.elasticsearch.common.settings.Settings;

import java.util.Collection;
import java.util.Collections;

public class SigarPlugin implements Plugin {

    private static final String NODE_INFO_EXTENDED_TYPE = "sigar";
    private static final Logger LOGGER = Loggers.getLogger(SigarPlugin.class);

    private final SigarService sigarService;

    public SigarPlugin(Settings settings) {
        sigarService = new SigarService(settings);
    }

    @Override
    public String name() {
        return "crate-sigar";
    }

    @Override
    public String description() {
        return "Provide operating system information and statistics using the SIGAR library";
    }

    @Override
    public Settings additionalSettings() {
        if (!sigarService.sigarAvailable()) {
            LOGGER.warn("Sigar library is not available");
            return Settings.EMPTY;
        }

        Settings.Builder settingsBuilder = Settings.builder();
        settingsBuilder.put(MonitorModule.NODE_INFO_EXTENDED_TYPE_SETTING.getKey(), NODE_INFO_EXTENDED_TYPE);
        return settingsBuilder.build();
    }


    @Override
    public Collection<Module> createGuiceModules() {
        return Collections.singletonList(new SigarModule(sigarService));
    }

    public void onModule(MonitorModule monitorModule) {
        if (sigarService.sigarAvailable()) {
            monitorModule.addExtendedNodeInfoType(NODE_INFO_EXTENDED_TYPE, SigarExtendedNodeInfo.class);
        }
    }
}