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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.indexer.counts;

import org.graylog2.indexer.IndexSet;
import org.graylog2.indexer.IndexSetRegistry;

import javax.inject.Inject;
import javax.inject.Singleton;
import java.util.Arrays;
import java.util.List;

@Singleton
public class Counts {
    private final IndexSetRegistry indexSetRegistry;
    private final CountsAdapter countsAdapter;

    @Inject
    public Counts(IndexSetRegistry indexSetRegistry, CountsAdapter countsAdapter) {
        this.indexSetRegistry = indexSetRegistry;
        this.countsAdapter = countsAdapter;
    }

    public long total() {
        return totalCount(indexSetRegistry.getManagedIndices());
    }

    public long total(final IndexSet indexSet) {
        return totalCount(indexSet.getManagedIndices());
    }

    private long totalCount(final String[] indexNames) {
        // Return 0 if there are no indices in the given index set. If we run the query with an empty index list,
        // Elasticsearch will count all documents in all indices and thus return a wrong count.
        if (indexNames.length == 0) {
            return 0L;
        }

        final List indices = Arrays.asList(indexNames);
        return countsAdapter.totalCount(indices);
    }
}