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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.search.MatchAllDocsQuery;
import org.apache.lucene.search.Query;
import org.elasticsearch.common.Strings;
import org.elasticsearch.index.fielddata.IndexFieldData;
import org.elasticsearch.index.fielddata.plain.ConstantIndexFieldData;
import org.elasticsearch.index.query.SearchExecutionContext;
import org.elasticsearch.search.aggregations.support.CoreValuesSourceType;
import org.elasticsearch.search.lookup.SearchLookup;
import org.elasticsearch.search.lookup.SourceLookup;

import java.io.IOException;
import java.util.Collections;
import java.util.List;
import java.util.function.Supplier;

public class IndexFieldMapper extends MetadataFieldMapper {

    public static final String NAME = "_index";

    public static final String CONTENT_TYPE = "_index";

    private static final IndexFieldMapper INSTANCE = new IndexFieldMapper();

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

    static final class IndexFieldType extends ConstantFieldType {

        static final IndexFieldType INSTANCE = new IndexFieldType();

        private IndexFieldType() {
            super(NAME, Collections.emptyMap());
        }

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

        @Override
        protected boolean matches(String pattern, boolean caseInsensitive, SearchExecutionContext context) {
            if (caseInsensitive) {
                // Thankfully, all index names are lower-cased so we don't have to pass a case_insensitive mode flag
                // down to all the index name-matching logic. We just lower-case the search string
                pattern = Strings.toLowercaseAscii(pattern);
            }
            return context.indexMatches(pattern);
        }

        @Override
        public Query existsQuery(SearchExecutionContext context) {
            return new MatchAllDocsQuery();
        }

        @Override
        public IndexFieldData.Builder fielddataBuilder(String fullyQualifiedIndexName, Supplier searchLookup) {
            return new ConstantIndexFieldData.Builder(fullyQualifiedIndexName, name(), CoreValuesSourceType.KEYWORD);
        }

        @Override
        public ValueFetcher valueFetcher(SearchExecutionContext context, String format) {
            return new ValueFetcher() {

                private final List