/*
 * 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.search.fetch.subphase.highlight;

import org.apache.lucene.document.Field;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.highlight.Encoder;
import org.apache.lucene.search.vectorhighlight.BoundaryScanner;
import org.apache.lucene.search.vectorhighlight.FieldFragList.WeightedFragInfo;
import org.apache.lucene.search.vectorhighlight.ScoreOrderFragmentsBuilder;
import org.elasticsearch.index.mapper.MappedFieldType;
import org.elasticsearch.search.lookup.SourceLookup;

import java.io.IOException;
import java.util.List;

public class SourceScoreOrderFragmentsBuilder extends ScoreOrderFragmentsBuilder {

    private final MappedFieldType fieldType;
    private final SourceLookup sourceLookup;
    private final boolean fixBrokenAnalysis;

    public SourceScoreOrderFragmentsBuilder(MappedFieldType fieldType,
                                            boolean fixBrokenAnalysis,
                                            SourceLookup sourceLookup,
                                            String[] preTags,
                                            String[] postTags,
                                            BoundaryScanner boundaryScanner) {
        super(preTags, postTags, boundaryScanner);
        this.fieldType = fieldType;
        this.sourceLookup = sourceLookup;
        this.fixBrokenAnalysis = fixBrokenAnalysis;
    }

    @Override
    protected Field[] getFields(IndexReader reader, int docId, String fieldName) throws IOException {
        // we know its low level reader, and matching docId, since that's how we call the highlighter with
        List<Object> values = sourceLookup.extractRawValues(fieldType.name());
        Field[] fields = new Field[values.size()];
        for (int i = 0; i < values.size(); i++) {
            fields[i] = new Field(fieldType.name(), values.get(i).toString(), TextField.TYPE_NOT_STORED);
        }
        return fields;
    }

    @Override
    protected String makeFragment( StringBuilder buffer, int[] index, Field[] values, WeightedFragInfo fragInfo,
            String[] preTags, String[] postTags, Encoder encoder) {
        if (fixBrokenAnalysis) {
            fragInfo = FragmentBuilderHelper.fixWeightedFragInfo(fragInfo);
        }
        return super.makeFragment(buffer, index, values, fragInfo, preTags, postTags, encoder);
    }
}
