/*
    * 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.io.euclidean.threed.stl;
  
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.net.URL;
  import java.nio.charset.StandardCharsets;
  import java.util.stream.Collectors;
  
  import org.apache.commons.geometry.core.GeometryTestUtils;
  import org.apache.commons.geometry.euclidean.threed.BoundaryList3D;
  import org.apache.commons.geometry.io.euclidean.EuclideanIOTestUtils;
  import org.apache.commons.geometry.io.euclidean.threed.FacetDefinitionReader;
  import org.apache.commons.geometry.io.euclidean.threed.FacetDefinitions;
  import org.apache.commons.numbers.core.Precision;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  
  class StlFacetDefinitionReadersTest {
  
      private static final double TEST_EPS = 1e-10;
  
      private static final Precision.DoubleEquivalence TEST_PRECISION =
              Precision.doubleEquivalenceOfEpsilon(TEST_EPS);
  
      @Test
      void testCreate_cubeBinaryFile() throws IOException {
          // arrange
          final URL url = EuclideanIOTestUtils.resource("/models/cube-binary.stl");
  
          // act
          try (FacetDefinitionReader reader = StlFacetDefinitionReaders.create(url.openStream(), null)) {
  
              // assert
              Assertions.assertEquals(BinaryStlFacetDefinitionReader.class, reader.getClass());
  
              BoundaryList3D boundaries = new BoundaryList3D(EuclideanIOTestUtils.readAll(reader).stream()
                      .map(f -> FacetDefinitions.toPolygon(f, TEST_PRECISION))
                      .collect(Collectors.toList()));
              EuclideanIOTestUtils.assertCube(boundaries, TEST_EPS);
          }
      }
  
      @Test
      void testCreate_cubeAsciiFile() throws IOException {
          // arrange
          final URL url = EuclideanIOTestUtils.resource("/models/cube-ascii.stl");
  
          // act
          try (FacetDefinitionReader reader = StlFacetDefinitionReaders.create(url.openStream(), null)) {
  
              // assert
              Assertions.assertEquals(TextStlFacetDefinitionReader.class, reader.getClass());
  
              BoundaryList3D boundaries = new BoundaryList3D(EuclideanIOTestUtils.readAll(reader).stream()
                      .map(f -> FacetDefinitions.toPolygon(f, TEST_PRECISION))
                      .collect(Collectors.toList()));
              EuclideanIOTestUtils.assertCube(boundaries, TEST_EPS);
          }
      }
  
      @Test
      void testCreate_nonStandardCharset_charsetGiven() {
          // arrange
          final String content = "solid test\n" +
                  "facet normal 1 2 3 " +
                  "outer loop " +
                      "vertex 4 5 6 " +
                      "vertex 7 8 9 " +
                      "vertex 10 11 12 " +
                  "endloop " +
              "endfacet " +
              "endsolid test";
  
          final ByteArrayInputStream in = new ByteArrayInputStream(content.getBytes(StandardCharsets.UTF_16));
  
          // act
          try (FacetDefinitionReader reader = StlFacetDefinitionReaders.create(in, StandardCharsets.UTF_16)) {
  
              // assert
              Assertions.assertEquals(TextStlFacetDefinitionReader.class, reader.getClass());
  
              Assertions.assertNotNull(reader.readFacet());
              Assertions.assertNull(reader.readFacet());
         }
     }
 
     @Test
     void testCreate_nonStandardCharset_noCharsetGiven() {
         // arrange
         final String content = "solid test\n" +
                 "facet normal 1 2 3 " +
                 "outer loop " +
                     "vertex 4 5 6 " +
                     "vertex 7 8 9 " +
                     "vertex 10 11 12 " +
                 "endloop " +
             "endfacet " +
             "endsolid test";
 
         final ByteArrayInputStream in = new ByteArrayInputStream(content.getBytes(StandardCharsets.UTF_16));
 
         // act
         try (FacetDefinitionReader reader = StlFacetDefinitionReaders.create(in, null)) {
 
             // assert
             Assertions.assertEquals(BinaryStlFacetDefinitionReader.class, reader.getClass());
 
             Assertions.assertNotNull(reader.readFacet());
             Assertions.assertNotNull(reader.readFacet());
             Assertions.assertThrows(IllegalStateException.class, () -> reader.readFacet());
         }
     }
 
     @Test
     void testCreate_notEnoughBytes() {
         // arrange
         final byte[] bytes = new byte[1];
         final ByteArrayInputStream in = new ByteArrayInputStream(bytes);
 
         // act/assert
         GeometryTestUtils.assertThrowsWithMessage(
                 () -> StlFacetDefinitionReaders.create(in, null),
                 IllegalStateException.class,
                 "Cannot determine STL format: attempted to read 5 bytes but found only 1 available");
     }
 }