/*
 * Licensed to ElasticSearch and Shay Banon 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.query;

import org.apache.lucene.search.Query;
import org.apache.lucene.search.TermRangeQuery;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.lucene.BytesRefs;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.mapper.MapperService;

import java.io.IOException;

import static org.elasticsearch.index.query.support.QueryParsers.wrapSmartNameQuery;

/**
 *
 */
public class RangeQueryParser implements QueryParser {

    public static final String NAME = "range";

    @Inject
    public RangeQueryParser() {
    }

    @Override
    public String[] names() {
        return new String[]{NAME};
    }

    @Override
    public Query parse(QueryParseContext parseContext) throws IOException, QueryParsingException {
        XContentParser parser = parseContext.parser();

        XContentParser.Token token = parser.nextToken();
        if (token != XContentParser.Token.FIELD_NAME) {
            throw new QueryParsingException(parseContext.index(), "[range] query malformed, no field to indicate field name");
        }
        String fieldName = parser.currentName();
        token = parser.nextToken();
        if (token != XContentParser.Token.START_OBJECT) {
            throw new QueryParsingException(parseContext.index(), "[range] query malformed, after field missing start object");
        }

        Object from = null;
        Object to = null;
        boolean includeLower = true;
        boolean includeUpper = true;
        float boost = 1.0f;

        String currentFieldName = null;
        while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
            if (token == XContentParser.Token.FIELD_NAME) {
                currentFieldName = parser.currentName();
            } else {
                if ("from".equals(currentFieldName)) {
                    from = parser.objectBytes();
                } else if ("to".equals(currentFieldName)) {
                    to = parser.objectBytes();
                } else if ("include_lower".equals(currentFieldName) || "includeLower".equals(currentFieldName)) {
                    includeLower = parser.booleanValue();
                } else if ("include_upper".equals(currentFieldName) || "includeUpper".equals(currentFieldName)) {
                    includeUpper = parser.booleanValue();
                } else if ("boost".equals(currentFieldName)) {
                    boost = parser.floatValue();
                } else if ("gt".equals(currentFieldName)) {
                    from = parser.objectBytes();
                    includeLower = false;
                } else if ("gte".equals(currentFieldName) || "ge".equals(currentFieldName)) {
                    from = parser.objectBytes();
                    includeLower = true;
                } else if ("lt".equals(currentFieldName)) {
                    to = parser.objectBytes();
                    includeUpper = false;
                } else if ("lte".equals(currentFieldName) || "le".equals(currentFieldName)) {
                    to = parser.objectBytes();
                    includeUpper = true;
                } else {
                    throw new QueryParsingException(parseContext.index(), "[range] query does not support [" + currentFieldName + "]");
                }
            }
        }

        // move to the next end object, to close the field name
        token = parser.nextToken();
        if (token != XContentParser.Token.END_OBJECT) {
            throw new QueryParsingException(parseContext.index(), "[range] query malformed, does not end with an object");
        }

        Query query = null;
        MapperService.SmartNameFieldMappers smartNameFieldMappers = parseContext.smartFieldMappers(fieldName);
        if (smartNameFieldMappers != null) {
            if (smartNameFieldMappers.hasMapper()) {
                //LUCENE 4 UPGRADE Mapper#rangeQuery should use bytesref as well? 
                query = smartNameFieldMappers.mapper().rangeQuery(from, to, includeLower, includeUpper, parseContext);
            }
        }
        if (query == null) {
            query = new TermRangeQuery(fieldName, BytesRefs.toBytesRef(from), BytesRefs.toBytesRef(to), includeLower, includeUpper);
        }
        query.setBoost(boost);
        return wrapSmartNameQuery(query, smartNameFieldMappers, parseContext);
    }
}