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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 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.SpatialStrategy;
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 SpatialQueryBuilderDistanceSphere extends SpatialQueryBuilderAbstract {

  public static final String NAME = "distance_sphere";

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

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

    SpatialStrategy strategy = manager.strategy();

    Number distance = (Number) query.get("distance");

    // SpatialArgs args1 = new SpatialArgs(SpatialOperation.Intersects, shape);
    //
    // Filter filter = strategy.makeFilter(args1);
    // return new OSpatialQueryContext(null, manager.searcher(), new MatchAllDocsQuery(), filter);

    SpatialArgs args =
        new SpatialArgs(
            SpatialOperation.Intersects,
            factory
                .context()
                .makeCircle(
                    (Point) shape,
                    DistanceUtils.dist2Degrees(
                        distance.doubleValue() / 1000, DistanceUtils.EARTH_MEAN_RADIUS_KM)));
    //    Filter filter = strategy.makeFilter(args);

    Query filterQuery = strategy.makeQuery(args);

    IndexSearcher searcher = manager.searcher();
    DoubleValuesSource valueSource = strategy.makeDistanceValueSource((Point) shape);
    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;
  }
}