/*
 * 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.operation.reference.sys.check.node;

import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.inject.Singleton;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.gateway.GatewayService;

@Singleton
public class RecoveryAfterNodesSysCheck extends AbstractSysNodeCheck {

    private final ClusterService clusterService;
    private final Settings settings;

    static final int ID = 2;
    private static final String DESCRIPTION = "The value of the cluster setting 'gateway.recover_after_nodes' " +
                                              "needs to be greater than half of the maximum/expected number of nodes and equal or less than " +
                                              "the maximum/expected number of nodes in the cluster.";

    @Inject
    public RecoveryAfterNodesSysCheck(ClusterService clusterService, Settings settings) {
        super(ID, DESCRIPTION, Severity.HIGH, clusterService);
        this.clusterService = clusterService;
        this.settings = settings;
    }

    @Override
    public boolean validate() {
        return validate(
            GatewayService.RECOVER_AFTER_NODES_SETTING.get(settings),
            GatewayService.EXPECTED_NODES_SETTING.get(settings)
        );
    }

    protected boolean validate(int afterNodes, int expectedNodes) {
        return clusterService.state().nodes().getSize() == 1
               || (expectedNodes / 2) < afterNodes && afterNodes <= expectedNodes;
    }

}