/*
    * 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 java.util.List;
  import java.util.stream.Collectors;
  
  import org.apache.commons.geometry.core.precision.DoublePrecisionContext;
  import org.apache.commons.geometry.core.precision.EpsilonDoublePrecisionContext;
  import org.junit.Assert;
  import org.junit.Test;
  
  public class BoundarySource2DTest {
  
      private static final double TEST_EPS = 1e-10;
  
      private static final DoublePrecisionContext TEST_PRECISION =
              new EpsilonDoublePrecisionContext(TEST_EPS);
  
      @Test
      public void testToTree() {
          // act
          final BoundarySource2D src = BoundarySource2D.from(
              Lines.segmentFromPoints(Vector2D.ZERO, Vector2D.of(1, 0), TEST_PRECISION),
              Lines.segmentFromPoints(Vector2D.of(1, 0), Vector2D.of(1, 1), TEST_PRECISION)
          );
  
          // act
          final RegionBSPTree2D tree = src.toTree();
  
          // assert
          Assert.assertEquals(5, tree.count());
          Assert.assertFalse(tree.isFull());
          Assert.assertFalse(tree.isEmpty());
      }
  
      @Test
      public void testToTree_noBoundaries() {
          // act
          final BoundarySource2D src = BoundarySource2D.from();
  
          // act
          final RegionBSPTree2D tree = src.toTree();
  
          // assert
          Assert.assertEquals(1, tree.count());
          Assert.assertFalse(tree.isFull());
          Assert.assertTrue(tree.isEmpty());
      }
  
      @Test
      public void testFrom_varargs_empty() {
          // act
          final BoundarySource2D src = BoundarySource2D.from();
  
          // assert
          final List<LineConvexSubset> segments = src.boundaryStream().collect(Collectors.toList());
          Assert.assertEquals(0, segments.size());
      }
  
      @Test
      public void testFrom_varargs() {
          // act
          final Segment a = Lines.segmentFromPoints(Vector2D.ZERO, Vector2D.Unit.PLUS_X, TEST_PRECISION);
          final Segment b = Lines.segmentFromPoints(Vector2D.Unit.PLUS_X, Vector2D.of(1, 1), TEST_PRECISION);
  
          final BoundarySource2D src = BoundarySource2D.from(a, b);
  
          // assert
          final List<LineConvexSubset> segments = src.boundaryStream().collect(Collectors.toList());
          Assert.assertEquals(2, segments.size());
  
          Assert.assertSame(a, segments.get(0));
          Assert.assertSame(b, segments.get(1));
      }
  
      @Test
      public void testFrom_list_empty() {
          // arrange
          final List<LineConvexSubset> input = new ArrayList<>();
  
          // act
          final BoundarySource2D src = BoundarySource2D.from(input);
  
         // assert
         final List<LineConvexSubset> segments = src.boundaryStream().collect(Collectors.toList());
         Assert.assertEquals(0, segments.size());
     }
 
     @Test
     public void testFrom_list() {
         // act
         final Segment a = Lines.segmentFromPoints(Vector2D.ZERO, Vector2D.Unit.PLUS_X, TEST_PRECISION);
         final Segment b = Lines.segmentFromPoints(Vector2D.Unit.PLUS_X, Vector2D.of(1, 1), TEST_PRECISION);
 
         final List<LineConvexSubset> input = new ArrayList<>();
         input.add(a);
         input.add(b);
 
         final BoundarySource2D src = BoundarySource2D.from(input);
 
         // assert
         final List<LineConvexSubset> segments = src.boundaryStream().collect(Collectors.toList());
         Assert.assertEquals(2, segments.size());
 
         Assert.assertSame(a, segments.get(0));
         Assert.assertSame(b, segments.get(1));
     }
 }