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// Copyright 2015-2019 SWIM.AI inc.
//
// 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.

package swim.math;

import swim.structure.Item;
import swim.structure.Record;
import swim.structure.Value;

final class BoxR2Form extends R2Form {
  @Override
  public String tag() {
    return "box";
  }

  @Override
  public Class type() {
    return BoxR2.class;
  }

  @Override
  public double getXMin(BoxR2 box) {
    return box.xMin;
  }

  @Override
  public double getYMin(BoxR2 box) {
    return box.yMin;
  }

  @Override
  public double getXMax(BoxR2 box) {
    return box.xMax;
  }

  @Override
  public double getYMax(BoxR2 box) {
    return box.yMax;
  }

  @Override
  public boolean contains(BoxR2 outer, BoxR2 inner) {
    return outer.contains(inner);
  }

  @Override
  public boolean intersects(BoxR2 s, BoxR2 t) {
    return s.intersects(t);
  }

  @Override
  public Item mold(BoxR2 box) {
    if (box != null) {
      return Record.create(1).attr(tag(), Record.create(4)
          .item(box.xMin).item(box.yMin)
          .item(box.xMax).item(box.yMax));
    } else {
      return Item.extant();
    }
  }

  @Override
  public BoxR2 cast(Item item) {
    final Value header = item.toValue().header(tag());
    if (header.isDefined()) {
      final double xMin = header.getItem(0).doubleValue(0.0);
      final double yMin = header.getItem(1).doubleValue(0.0);
      final double xMax = header.getItem(2).doubleValue(0.0);
      final double yMax = header.getItem(3).doubleValue(0.0);
      return new BoxR2(xMin, yMin, xMax, yMax);
    } else {
      return null;
    }
  }
}