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/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog2.storage.providers;

import org.graylog2.storage.versionprobe.ElasticsearchProbeException;
import org.graylog2.storage.SearchVersion;
import org.graylog2.storage.versionprobe.VersionProbe;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.annotation.Nullable;
import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Provider;
import javax.inject.Singleton;
import java.net.URI;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.ExecutionException;

@Singleton
public class ElasticsearchVersionProvider implements Provider {
    private static final Logger LOG = LoggerFactory.getLogger(ElasticsearchVersionProvider.class);
    public static final String NO_HOST_REACHABLE_ERROR = "Unable to probe any host for Elasticsearch version";

    @SuppressWarnings("OptionalUsedAsFieldOrParameterType")
    private final Optional versionOverride;
    private final List elasticsearchHosts;
    private final VersionProbe versionProbe;
    private final AtomicCache> cachedVersion;

    @Inject
    public ElasticsearchVersionProvider(@Named("elasticsearch_version") @Nullable SearchVersion versionOverride,
                                        @Named("elasticsearch_hosts") List elasticsearchHosts,
                                        VersionProbe versionProbe,
                                        AtomicCache> cachedVersion) {

        this.versionOverride = Optional.ofNullable(versionOverride);
        this.elasticsearchHosts = elasticsearchHosts;
        this.versionProbe = versionProbe;
        this.cachedVersion = cachedVersion;
    }

    @Override
    public SearchVersion get() {
        if (this.versionOverride.isPresent()) {
            final SearchVersion explicitVersion = versionOverride.get();
            LOG.info("Elasticsearch version set to " + explicitVersion + " - disabling version probe.");
            return explicitVersion;
        }

        try {
            return this.cachedVersion.get(() -> {
                final Optional probedVersion = this.versionProbe.probe(this.elasticsearchHosts);
                probedVersion.ifPresent(version -> LOG.info("Elasticsearch cluster is running " + version));
                return probedVersion;
            })
                    .orElseThrow(() -> new ElasticsearchProbeException(NO_HOST_REACHABLE_ERROR + "!"));
        } catch (ExecutionException | InterruptedException e) {
            throw new ElasticsearchProbeException(NO_HOST_REACHABLE_ERROR + ": ", e);
        }
    }
}