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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.search.aggregations.bucket.filter;

import org.elasticsearch.common.xcontent.ObjectParser;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.common.xcontent.XContentParserUtils;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.Aggregations;
import org.elasticsearch.search.aggregations.ParsedMultiBucketAggregation;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import static org.elasticsearch.common.xcontent.XContentParserUtils.ensureExpectedToken;

public class ParsedFilters extends ParsedMultiBucketAggregation implements Filters {

    private Map bucketMap;

    @Override
    public String getType() {
        return FiltersAggregationBuilder.NAME;
    }

    @Override
    public List getBuckets() {
        return buckets;
    }

    @Override
    public ParsedBucket getBucketByKey(String key) {
        if (bucketMap == null) {
            bucketMap = new HashMap<>(buckets.size());
            for (ParsedBucket bucket : buckets) {
                bucketMap.put(bucket.getKey(), bucket);
            }
        }
        return bucketMap.get(key);
    }

    private static final ObjectParser PARSER =
            new ObjectParser<>(ParsedFilters.class.getSimpleName(), true, ParsedFilters::new);
    static {
        declareMultiBucketAggregationFields(PARSER,
                parser -> ParsedBucket.fromXContent(parser, false),
                parser -> ParsedBucket.fromXContent(parser, true));
    }

    public static ParsedFilters fromXContent(XContentParser parser, String name) throws IOException {
        ParsedFilters aggregation = PARSER.parse(parser, null);
        aggregation.setName(name);
        // in case this is not a keyed aggregation, we need to add numeric keys to the buckets
        if (aggregation.keyed == false) {
            int i = 0;
            for (ParsedBucket bucket : aggregation.buckets) {
                assert bucket.key == null;
                bucket.key = String.valueOf(i);
                i++;
            }
        }
        return aggregation;
    }

    public static class ParsedBucket extends ParsedMultiBucketAggregation.ParsedBucket implements Filters.Bucket {

        private String key;

        @Override
        public String getKey() {
            return key;
        }

        @Override
        public String getKeyAsString() {
            return key;
        }

        @Override
        public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
            if (isKeyed()) {
                builder.startObject(key);
            } else {
                builder.startObject();
            }
            builder.field(CommonFields.DOC_COUNT.getPreferredName(), getDocCount());
            getAggregations().toXContentInternal(builder, params);
            builder.endObject();
            return builder;
        }


        static ParsedBucket fromXContent(XContentParser parser, boolean keyed) throws IOException {
            final ParsedBucket bucket = new ParsedBucket();
            bucket.setKeyed(keyed);
            XContentParser.Token token = parser.currentToken();
            String currentFieldName = parser.currentName();
            if (keyed) {
                ensureExpectedToken(XContentParser.Token.FIELD_NAME, token, parser::getTokenLocation);
                bucket.key = currentFieldName;
                ensureExpectedToken(XContentParser.Token.START_OBJECT, parser.nextToken(), parser::getTokenLocation);
            }

            List aggregations = new ArrayList<>();
            while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
                if (token == XContentParser.Token.FIELD_NAME) {
                    currentFieldName = parser.currentName();
                } else if (token.isValue()) {
                    if (CommonFields.DOC_COUNT.getPreferredName().equals(currentFieldName)) {
                        bucket.setDocCount(parser.longValue());
                    }
                } else if (token == XContentParser.Token.START_OBJECT) {
                    XContentParserUtils.parseTypedKeysObject(parser, Aggregation.TYPED_KEYS_DELIMITER, Aggregation.class,
                            aggregations::add);
                }
            }
            bucket.setAggregations(new Aggregations(aggregations));
            return bucket;
        }
    }
}