/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 */

/*
 * 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.
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/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.discovery;

import org.opensearch.action.admin.cluster.node.info.NodesInfoRequest;
import org.opensearch.action.admin.cluster.node.info.NodesInfoResponse;
import org.opensearch.common.settings.Settings;
import org.opensearch.test.OpenSearchIntegTestCase;
import org.opensearch.transport.TransportInfo;

import static org.opensearch.discovery.DiscoveryModule.DISCOVERY_SEED_PROVIDERS_SETTING;
import static org.opensearch.discovery.SettingsBasedSeedHostsProvider.DISCOVERY_SEED_HOSTS_SETTING;

@OpenSearchIntegTestCase.ClusterScope(scope = OpenSearchIntegTestCase.Scope.TEST, numDataNodes = 0, numClientNodes = 0)
public class SettingsBasedSeedHostsProviderIT extends OpenSearchIntegTestCase {

    @Override
    protected Settings nodeSettings(int nodeOrdinal) {
        Settings.Builder builder = Settings.builder().put(super.nodeSettings(nodeOrdinal));

        // super.nodeSettings enables file-based discovery, but here we disable it again so we can test the static list:
        if (randomBoolean()) {
            builder.putList(DISCOVERY_SEED_PROVIDERS_SETTING.getKey());
        } else {
            builder.remove(DISCOVERY_SEED_PROVIDERS_SETTING.getKey());
        }

        // super.nodeSettings sets this to an empty list, which disables any search for other nodes, but here we want this to happen:
        builder.remove(DISCOVERY_SEED_HOSTS_SETTING.getKey());

        return builder.build();
    }

    public void testClusterFormsWithSingleSeedHostInSettings() {
        final String seedNodeName = internalCluster().startNode();
        final NodesInfoResponse nodesInfoResponse = client(seedNodeName).admin()
            .cluster()
            .nodesInfo(new NodesInfoRequest("_local"))
            .actionGet();
        final String seedNodeAddress = nodesInfoResponse.getNodes()
            .get(0)
            .getInfo(TransportInfo.class)
            .getAddress()
            .publishAddress()
            .toString();
        logger.info("--> using seed node address {}", seedNodeAddress);

        int extraNodes = randomIntBetween(1, 5);
        internalCluster().startNodes(
            extraNodes,
            Settings.builder().putList(DISCOVERY_SEED_HOSTS_SETTING.getKey(), seedNodeAddress).build()
        );

        ensureStableCluster(extraNodes + 1);
    }
}