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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.mapper;

import org.apache.lucene.document.Field;
import org.apache.lucene.document.FieldType;
import org.apache.lucene.index.IndexOptions;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TermRangeQuery;
import org.elasticsearch.index.query.SearchExecutionContext;

import java.util.Collections;

/**
 * A field mapper that records fields that have been ignored because they were malformed.
 */
public final class IgnoredFieldMapper extends MetadataFieldMapper {

    public static final String NAME = "_ignored";

    public static final String CONTENT_TYPE = "_ignored";

    public static class Defaults {
        public static final String NAME = IgnoredFieldMapper.NAME;

        public static final FieldType FIELD_TYPE = new FieldType();

        static {
            FIELD_TYPE.setIndexOptions(IndexOptions.DOCS);
            FIELD_TYPE.setTokenized(false);
            FIELD_TYPE.setStored(true);
            FIELD_TYPE.setOmitNorms(true);
            FIELD_TYPE.freeze();
        }
    }

    public static final TypeParser PARSER = new FixedTypeParser(c -> new IgnoredFieldMapper());

    public static final class IgnoredFieldType extends StringFieldType {

        public static final IgnoredFieldType INSTANCE = new IgnoredFieldType();

        private IgnoredFieldType() {
            super(NAME, true, true, false, TextSearchInfo.SIMPLE_MATCH_ONLY, Collections.emptyMap());
        }

        @Override
        public String typeName() {
            return CONTENT_TYPE;
        }

        @Override
        public Query existsQuery(SearchExecutionContext context) {
            // This query is not performance sensitive, it only helps assess
            // quality of the data, so we may use a slow query. It shouldn't
            // be too slow in practice since the number of unique terms in this
            // field is bounded by the number of fields in the mappings.
            return new TermRangeQuery(name(), null, null, true, true);
        }

        @Override
        public ValueFetcher valueFetcher(SearchExecutionContext context, String format) {
            throw new UnsupportedOperationException("Cannot fetch values for internal field [" + name() + "].");
        }
    }

    private IgnoredFieldMapper() {
        super(IgnoredFieldType.INSTANCE);
    }

    @Override
    public void postParse(DocumentParserContext context) {
        for (String field : context.getIgnoredFields()) {
            context.doc().add(new Field(NAME, field, Defaults.FIELD_TYPE));
        }
    }

    @Override
    protected String contentType() {
        return CONTENT_TYPE;
    }

}