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/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

package org.elasticsearch.index;

import org.apache.lucene.index.FilterMergePolicy;
import org.apache.lucene.index.SegmentCommitInfo;
import org.apache.lucene.index.SegmentInfos;
import org.apache.lucene.index.TieredMergePolicy;

import java.io.IOException;
import java.util.Map;

/**
 * Wrapper around {@link TieredMergePolicy} which doesn't respect
 * {@link TieredMergePolicy#setMaxMergedSegmentMB(double)} on forced merges.
 * See https://issues.apache.org/jira/browse/LUCENE-7976.
 */
final class EsTieredMergePolicy extends FilterMergePolicy {

    final TieredMergePolicy regularMergePolicy;
    final TieredMergePolicy forcedMergePolicy;

    EsTieredMergePolicy() {
        super(new TieredMergePolicy());
        regularMergePolicy = (TieredMergePolicy) in;
        forcedMergePolicy = new TieredMergePolicy();
        forcedMergePolicy.setMaxMergedSegmentMB(Double.POSITIVE_INFINITY); // unlimited
    }

    @Override
    public MergeSpecification findForcedMerges(
        SegmentInfos infos,
        int maxSegmentCount,
        Map segmentsToMerge,
        MergeContext mergeContext
    ) throws IOException {
        return forcedMergePolicy.findForcedMerges(infos, maxSegmentCount, segmentsToMerge, mergeContext);
    }

    @Override
    public MergeSpecification findForcedDeletesMerges(SegmentInfos infos, MergeContext mergeContext) throws IOException {
        // we apply the max segment size through the regular merge policy in
        // order to avoid giant segments when expunging deletes on a read/write index
        return regularMergePolicy.findForcedDeletesMerges(infos, mergeContext);
    }

    public void setForceMergeDeletesPctAllowed(double forceMergeDeletesPctAllowed) {
        regularMergePolicy.setForceMergeDeletesPctAllowed(forceMergeDeletesPctAllowed);
        forcedMergePolicy.setForceMergeDeletesPctAllowed(forceMergeDeletesPctAllowed);
    }

    public double getForceMergeDeletesPctAllowed() {
        return forcedMergePolicy.getForceMergeDeletesPctAllowed();
    }

    public void setFloorSegmentMB(double mbFrac) {
        regularMergePolicy.setFloorSegmentMB(mbFrac);
        forcedMergePolicy.setFloorSegmentMB(mbFrac);
    }

    public double getFloorSegmentMB() {
        return regularMergePolicy.getFloorSegmentMB();
    }

    public void setMaxMergeAtOnce(int maxMergeAtOnce) {
        regularMergePolicy.setMaxMergeAtOnce(maxMergeAtOnce);
        forcedMergePolicy.setMaxMergeAtOnce(maxMergeAtOnce);
    }

    public int getMaxMergeAtOnce() {
        return regularMergePolicy.getMaxMergeAtOnce();
    }

    // only setter that must NOT delegate to the forced merge policy
    public void setMaxMergedSegmentMB(double mbFrac) {
        regularMergePolicy.setMaxMergedSegmentMB(mbFrac);
    }

    public double getMaxMergedSegmentMB() {
        return regularMergePolicy.getMaxMergedSegmentMB();
    }

    public void setSegmentsPerTier(double segmentsPerTier) {
        regularMergePolicy.setSegmentsPerTier(segmentsPerTier);
        forcedMergePolicy.setSegmentsPerTier(segmentsPerTier);
    }

    public double getSegmentsPerTier() {
        return regularMergePolicy.getSegmentsPerTier();
    }

    public void setDeletesPctAllowed(double deletesPctAllowed) {
        regularMergePolicy.setDeletesPctAllowed(deletesPctAllowed);
        forcedMergePolicy.setDeletesPctAllowed(deletesPctAllowed);
    }

    public double getDeletesPctAllowed() {
        return regularMergePolicy.getDeletesPctAllowed();
    }
}