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/*
 * 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.Filter;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.cache.filter.support.CacheKeyFilter;
import org.elasticsearch.index.mapper.FieldMapper;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.index.mapper.core.NumberFieldMapper;

import java.io.IOException;

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

/**
 *
 */
public class NumericRangeFilterParser implements FilterParser {

    public static final String NAME = "numeric_range";

    @Inject
    public NumericRangeFilterParser() {
    }

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

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

        boolean cache = false; // default to false, since its using fielddata cache
        CacheKeyFilter.Key cacheKey = null;
        String fieldName = null;
        String from = null;
        String to = null;
        boolean includeLower = true;
        boolean includeUpper = true;

        String filterName = null;
        String currentFieldName = null;
        XContentParser.Token token;
        while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
            if (token == XContentParser.Token.FIELD_NAME) {
                currentFieldName = parser.currentName();
            } else if (token == XContentParser.Token.START_OBJECT) {
                fieldName = currentFieldName;
                while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
                    if (token == XContentParser.Token.FIELD_NAME) {
                        currentFieldName = parser.currentName();
                    } else {
                        if ("from".equals(currentFieldName)) {
                            from = parser.textOrNull();
                        } else if ("to".equals(currentFieldName)) {
                            to = parser.textOrNull();
                        } 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 ("gt".equals(currentFieldName)) {
                            from = parser.textOrNull();
                            includeLower = false;
                        } else if ("gte".equals(currentFieldName) || "ge".equals(currentFieldName)) {
                            from = parser.textOrNull();
                            includeLower = true;
                        } else if ("lt".equals(currentFieldName)) {
                            to = parser.textOrNull();
                            includeUpper = false;
                        } else if ("lte".equals(currentFieldName) || "le".equals(currentFieldName)) {
                            to = parser.textOrNull();
                            includeUpper = true;
                        } else {
                            throw new QueryParsingException(parseContext.index(), "[numeric_range] filter does not support [" + currentFieldName + "]");
                        }
                    }
                }
            } else if (token.isValue()) {
                if ("_name".equals(currentFieldName)) {
                    filterName = parser.text();
                } else if ("_cache".equals(currentFieldName)) {
                    cache = parser.booleanValue();
                } else if ("_cache_key".equals(currentFieldName) || "_cacheKey".equals(currentFieldName)) {
                    cacheKey = new CacheKeyFilter.Key(parser.text());
                } else {
                    throw new QueryParsingException(parseContext.index(), "[numeric_range] filter does not support [" + currentFieldName + "]");
                }
            }
        }

        MapperService.SmartNameFieldMappers smartNameFieldMappers = parseContext.smartFieldMappers(fieldName);

        if (smartNameFieldMappers == null || !smartNameFieldMappers.hasMapper()) {
            throw new QueryParsingException(parseContext.index(), "failed to find mapping for field [" + fieldName + "]");
        }

        FieldMapper mapper = smartNameFieldMappers.mapper();
        if (!(mapper instanceof NumberFieldMapper)) {
            throw new QueryParsingException(parseContext.index(), "Field [" + fieldName + "] is not a numeric type");
        }
        Filter filter = ((NumberFieldMapper) mapper).rangeFilter(parseContext.indexCache().fieldData(), from, to, includeLower, includeUpper, parseContext);

        if (cache) {
            filter = parseContext.cacheFilter(filter, cacheKey);
        }
        filter = wrapSmartNameFilter(filter, smartNameFieldMappers, parseContext);
        if (filterName != null) {
            parseContext.addNamedFilter(filterName, filter);
        }
        return filter;
    }
}