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/**
 * Copyright 2010-2016 OrientDB LTD (http://orientdb.com)
 *
 * Licensed 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.
 *
 * For more information: http://www.orientdb.com
 */
package com.orientechnologies.spatial.strategy;

import com.orientechnologies.spatial.engine.OLuceneSpatialIndexContainer;
import com.orientechnologies.spatial.query.OSpatialQueryContext;
import com.orientechnologies.spatial.shape.OShapeBuilder;
import java.util.Arrays;
import java.util.Map;
import java.util.Optional;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.DoubleValuesSource;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.MatchAllDocsQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.Sort;
import org.apache.lucene.spatial.query.SpatialArgs;
import org.apache.lucene.spatial.query.SpatialOperation;
import org.locationtech.spatial4j.distance.DistanceUtils;
import org.locationtech.spatial4j.shape.Point;
import org.locationtech.spatial4j.shape.Shape;

/** Created by Enrico Risa on 11/08/15. */
public class SpatialQueryBuilderNear extends SpatialQueryBuilderAbstract {

  public static final String NAME = "near";

  public SpatialQueryBuilderNear(OLuceneSpatialIndexContainer manager, OShapeBuilder factory) {
    super(manager, factory);
  }

  @Override
  public OSpatialQueryContext build(Map query) throws Exception {
    Shape shape = parseShape(query);

    double distance =
        Optional.ofNullable(query.get(MAX_DISTANCE))
            .map(Number.class::cast)
            .map(n -> n.doubleValue())
            .orElse(0D);

    Point p = (Point) shape;

    SpatialArgs args =
        new SpatialArgs(
            SpatialOperation.Intersects,
            factory
                .context()
                .makeCircle(
                    p.getX(),
                    p.getY(),
                    DistanceUtils.dist2Degrees(distance, DistanceUtils.EARTH_MEAN_RADIUS_KM)));
    Query filterQuery = manager.strategy().makeQuery(args);
    DoubleValuesSource valueSource = manager.strategy().makeDistanceValueSource(p);
    IndexSearcher searcher = manager.searcher();
    Sort distSort = new Sort(valueSource.getSortField(false)).rewrite(searcher);

    BooleanQuery q =
        new BooleanQuery.Builder()
            .add(filterQuery, BooleanClause.Occur.MUST)
            .add(new MatchAllDocsQuery(), BooleanClause.Occur.SHOULD)
            .build();

    return new OSpatialQueryContext(null, searcher, q, Arrays.asList(distSort.getSort()))
        .setSpatialArgs(args);
  }

  @Override
  public String getName() {
    return NAME;
  }
}