/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF 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.apache.commons.geometry.euclidean.twod;
  
  import java.util.ArrayList;
  
  import org.apache.commons.geometry.core.precision.DoublePrecisionContext;
  import org.apache.commons.geometry.core.precision.EpsilonDoublePrecisionContext;
  import org.apache.commons.geometry.euclidean.EuclideanTestUtils;
  import org.junit.Assert;
  import org.junit.Test;
  
  public class BoundarySourceBoundsBuilder2DTest {
  
      private static final double TEST_EPS = 1e-10;
  
      private static final DoublePrecisionContext TEST_PRECISION =
              new EpsilonDoublePrecisionContext(TEST_EPS);
  
      @Test
      public void testGetBounds_noBoundaries() {
          // arrange
          final BoundarySource2D src = BoundarySource2D.from(new ArrayList<>());
          final BoundarySourceBoundsBuilder2D builder = new BoundarySourceBoundsBuilder2D();
  
          // act
          final Bounds2D b = builder.getBounds(src);
  
          // assert
          Assert.assertNull(b);
      }
  
      @Test
      public void testGetBounds_singleFiniteBoundary() {
          // arrange
          final Segment seg = Lines.segmentFromPoints(Vector2D.of(1, -2), Vector2D.of(-3, 4), TEST_PRECISION);
  
          final BoundarySource2D src = BoundarySource2D.from(seg);
          final BoundarySourceBoundsBuilder2D builder = new BoundarySourceBoundsBuilder2D();
  
          // act
          final Bounds2D b = builder.getBounds(src);
  
          // assert
          checkBounds(b, Vector2D.of(-3, -2), Vector2D.of(1, 4));
          Assert.assertTrue(b.contains(seg.getStartPoint()));
          Assert.assertTrue(b.contains(seg.getEndPoint()));
      }
  
      @Test
      public void testGetBounds_multipleFiniteBoundaries() {
          // arrange
          final Segment seg1 = Lines.segmentFromPoints(Vector2D.of(1, -2), Vector2D.of(-3, 4), TEST_PRECISION);
          final Segment seg2 = Lines.segmentFromPoints(Vector2D.of(0, 1), Vector2D.of(7, 0), TEST_PRECISION);
          final Segment seg3 = Lines.segmentFromPoints(Vector2D.of(4, 6), Vector2D.of(-3, 9), TEST_PRECISION);
  
          final BoundarySource2D src = BoundarySource2D.from(seg1, seg2, seg3);
          final BoundarySourceBoundsBuilder2D builder = new BoundarySourceBoundsBuilder2D();
  
          // act
          final Bounds2D b = builder.getBounds(src);
  
          // assert
          checkBounds(b, Vector2D.of(-3, -2), Vector2D.of(7, 9));
  
          src.boundaryStream().forEach(boundary -> {
              Assert.assertTrue(b.contains(boundary.getStartPoint()));
              Assert.assertTrue(b.contains(boundary.getEndPoint()));
          });
      }
  
      @Test
      public void testGetBounds_singleInfiniteBoundary() {
          // arrange
          final LineConvexSubset boundary = Lines.fromPointAndDirection(Vector2D.ZERO, Vector2D.Unit.PLUS_X, TEST_PRECISION)
                  .span();
          final BoundarySource2D src = BoundarySource2D.from(boundary);
          final BoundarySourceBoundsBuilder2D builder = new BoundarySourceBoundsBuilder2D();
  
          // act
          final Bounds2D b = builder.getBounds(src);
  
          // assert
          Assert.assertNull(b);
      }
 
     @Test
     public void testGetBounds_mixedFiniteAndInfiniteBoundaries() {
         // arrange
         final LineConvexSubset inf = Lines.fromPointAndDirection(Vector2D.ZERO, Vector2D.Unit.PLUS_X, TEST_PRECISION)
                 .span()
                 .split(Lines.fromPointAndDirection(Vector2D.ZERO, Vector2D.Unit.PLUS_Y, TEST_PRECISION))
                 .getMinus();
 
         final Segment seg1 = Lines.segmentFromPoints(Vector2D.of(1, -2), Vector2D.of(-3, 4), TEST_PRECISION);
         final Segment seg2 = Lines.segmentFromPoints(Vector2D.of(0, 1), Vector2D.of(7, 0), TEST_PRECISION);
         final Segment seg3 = Lines.segmentFromPoints(Vector2D.of(4, 6), Vector2D.of(-3, 9), TEST_PRECISION);
 
         final BoundarySource2D src = BoundarySource2D.from(seg1, seg2, inf, seg3);
         final BoundarySourceBoundsBuilder2D builder = new BoundarySourceBoundsBuilder2D();
 
         // act
         final Bounds2D b = builder.getBounds(src);
 
         // assert
         Assert.assertNull(b);
     }
 
     private static void checkBounds(final Bounds2D b, final Vector2D min, final Vector2D max) {
         EuclideanTestUtils.assertCoordinatesEqual(min, b.getMin(), TEST_EPS);
         EuclideanTestUtils.assertCoordinatesEqual(max, b.getMax(), TEST_EPS);
     }
 }