/*
 * 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.range;

import org.elasticsearch.common.xcontent.ObjectParser;
import org.elasticsearch.common.xcontent.XContentParser;

import java.io.IOException;
import java.time.Instant;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;

public class ParsedDateRange extends ParsedRange {

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

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

    public static ParsedDateRange fromXContent(XContentParser parser, String name) throws IOException {
        ParsedDateRange aggregation = PARSER.parse(parser, null);
        aggregation.setName(name);
        return aggregation;
    }

    public static class ParsedBucket extends ParsedRange.ParsedBucket {

        @Override
        public Object getFrom() {
            return doubleAsDateTime(from);
        }

        @Override
        public Object getTo() {
            return doubleAsDateTime(to);
        }

        private static ZonedDateTime doubleAsDateTime(Double d) {
            if (d == null || Double.isInfinite(d)) {
                return null;
            }
            return Instant.ofEpochMilli(d.longValue()).atZone(ZoneOffset.UTC);
        }

        static ParsedBucket fromXContent(final XContentParser parser, final boolean keyed) throws IOException {
            return parseRangeBucketXContent(parser, ParsedBucket::new, keyed);
        }
    }
}
