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/*
 * Licensed to Metamarkets Group Inc. (Metamarkets) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Metamarkets 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 io.druid.sql.calcite.filtration;

import io.druid.query.filter.BoundDimFilter;
import io.druid.query.filter.DimFilter;
import io.druid.query.filter.SelectorDimFilter;
import io.druid.query.ordering.StringComparator;
import io.druid.sql.calcite.expression.RowExtraction;
import io.druid.sql.calcite.table.RowSignature;

public class ConvertBoundsToSelectors extends BottomUpTransform
{
  private final RowSignature sourceRowSignature;

  private ConvertBoundsToSelectors(final RowSignature sourceRowSignature)
  {
    this.sourceRowSignature = sourceRowSignature;
  }

  public static ConvertBoundsToSelectors create(final RowSignature sourceRowSignature)
  {
    return new ConvertBoundsToSelectors(sourceRowSignature);
  }

  @Override
  public DimFilter process(DimFilter filter)
  {
    if (filter instanceof BoundDimFilter) {
      final BoundDimFilter bound = (BoundDimFilter) filter;
      final StringComparator naturalStringComparator = sourceRowSignature.naturalStringComparator(
          RowExtraction.of(bound.getDimension(), bound.getExtractionFn())
      );

      if (bound.hasUpperBound()
          && bound.hasLowerBound()
          && bound.getUpper().equals(bound.getLower())
          && !bound.isUpperStrict()
          && !bound.isLowerStrict()
          && bound.getOrdering().equals(naturalStringComparator)) {
        return new SelectorDimFilter(
            bound.getDimension(),
            bound.getUpper(),
            bound.getExtractionFn()
        );
      } else {
        return filter;
      }
    } else {
      return filter;
    }
  }
}