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/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.elasticsearch.index.fielddata.plain;

import org.apache.lucene.index.*;
import org.apache.lucene.util.Accountable;
import org.apache.lucene.util.BytesRef;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.Index;
import org.elasticsearch.index.fielddata.AtomicOrdinalsFieldData;
import org.elasticsearch.index.fielddata.FieldDataType;
import org.elasticsearch.index.fielddata.IndexFieldData;
import org.elasticsearch.index.fielddata.IndexFieldDataCache;
import org.elasticsearch.index.fielddata.IndexOrdinalsFieldData;
import org.elasticsearch.index.mapper.FieldMapper;
import org.elasticsearch.index.mapper.MappedFieldType;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.indices.breaker.CircuitBreakerService;

import java.util.Collection;
import java.util.Collections;

public class IndexIndexFieldData extends AbstractIndexOrdinalsFieldData {

    public static class Builder implements IndexFieldData.Builder {

        @Override
        public IndexFieldData build(Index index, Settings indexSettings, MappedFieldType fieldType, IndexFieldDataCache cache,
                CircuitBreakerService breakerService, MapperService mapperService) {
            return new IndexIndexFieldData(index, fieldType.names());
        }

    }

    private static class IndexAtomicFieldData extends AbstractAtomicOrdinalsFieldData {

        private final String index;

        IndexAtomicFieldData(String index) {
            this.index = index;
        }

        @Override
        public long ramBytesUsed() {
            return 0;
        }

        @Override
        public Collection getChildResources() {
            return Collections.emptyList();
        }

        @Override
        public RandomAccessOrds getOrdinalsValues() {
            final BytesRef term = new BytesRef(index);
            final SortedDocValues sortedValues = new SortedDocValues() {

                @Override
                public BytesRef lookupOrd(int ord) {
                    return term;
                }

                @Override
                public int getValueCount() {
                    return 1;
                }

                @Override
                public int getOrd(int docID) {
                    return 0;
                }
            };
            return (RandomAccessOrds) DocValues.singleton(sortedValues);
        }

        @Override
        public void close() {
        }

    }

    private final AtomicOrdinalsFieldData atomicFieldData;

    private IndexIndexFieldData(Index index, MappedFieldType.Names names) {
        super(index, Settings.EMPTY, names, new FieldDataType("string"), null, null);
        atomicFieldData = new IndexAtomicFieldData(index().name());
    }

    @Override
    public void clear() {
    }

    @Override
    public final AtomicOrdinalsFieldData load(LeafReaderContext context) {
        return atomicFieldData;
    }

    @Override
    public AtomicOrdinalsFieldData loadDirect(LeafReaderContext context)
            throws Exception {
        return atomicFieldData;
    }

    @Override
    public IndexOrdinalsFieldData loadGlobal(DirectoryReader indexReader) {
        return this;
    }

    @Override
    public IndexOrdinalsFieldData localGlobalDirect(DirectoryReader indexReader) throws Exception {
        return loadGlobal(indexReader);
    }

}