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   *  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
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   *        http://www.apache.org/licenses/LICENSE-2.0
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   *  Unless required by applicable law or agreed to in writing,
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   *  "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
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  package org.apache.causeway.core.metamodel.valuesemantics;
  
  import java.text.DecimalFormat;
  import java.util.Optional;
  
  import org.assertj.core.api.Assertions;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.extension.ExtendWith;
  import org.mockito.Mock;
  import org.mockito.Mockito;
  import org.mockito.junit.jupiter.MockitoExtension;
  
  import org.apache.causeway.applib.Identifier;
  import org.apache.causeway.applib.value.semantics.ValueSemanticsAbstract;
  import org.apache.causeway.applib.value.semantics.ValueSemanticsProvider;
  import org.apache.causeway.core.config.CausewayConfiguration;
  import org.apache.causeway.core.metamodel.facets.objectvalue.digits.MaxFractionalDigitsFacet;
  import org.apache.causeway.core.metamodel.facets.objectvalue.digits.MaxFractionalDigitsFacetAbstract;
  import org.apache.causeway.core.metamodel.facets.objectvalue.digits.MinFractionalDigitsFacet;
  import org.apache.causeway.core.metamodel.facets.objectvalue.digits.MinFractionalDigitsFacetAbstract;
  import org.apache.causeway.core.metamodel.spec.feature.ObjectFeature;
  import org.apache.causeway.core.metamodel.specloader.SpecificationLoader;
  
  @ExtendWith(MockitoExtension.class)
  class BigDecimalValueSemanticsProvider_configureDecimalFormat_Test {
  
      @Mock Identifier mockIdentifier;
      @Mock ObjectFeature mockObjectFeature;
      @Mock SpecificationLoader mockSpecificationLoader;
  
      ValueSemanticsProvider.Context context;
      CausewayConfiguration causewayConfiguration;
  
      BigDecimalValueSemantics valueSemantics;
  
      @BeforeEach
      void setUpObjects() throws Exception {
  
          context = new ValueSemanticsProvider.Context(mockIdentifier, null);
  
          causewayConfiguration = CausewayConfiguration.builder().build();
          causewayConfiguration.getValueTypes().getBigDecimal().setMinScale(null);
  
          // expecting
          Mockito.lenient().when(mockSpecificationLoader.loadFeature(mockIdentifier)).thenReturn(Optional.of(mockObjectFeature));
  
          valueSemantics = new BigDecimalValueSemantics();
          valueSemantics.setSpecificationLoader(mockSpecificationLoader);
          valueSemantics.setCausewayConfiguration(causewayConfiguration);
      }
  
      @Test
      void max_and_min_facets_set() {
  
          int maxScale = 10;
          int minScale = 2;
  
          // expecting
          Mockito.lenient().when(mockObjectFeature.lookupFacet(MaxFractionalDigitsFacet.class))
                  .thenReturn(Optional.of(new MaxFractionalDigitsFacetAbstract(maxScale, mockObjectFeature) {}));
          Mockito.lenient().when(mockObjectFeature.lookupFacet(MinFractionalDigitsFacet.class))
                 .thenReturn(Optional.of(new MinFractionalDigitsFacetAbstract(minScale, mockObjectFeature) {}));
  
          // when
          DecimalFormat format = new DecimalFormat();
          valueSemantics.configureDecimalFormat(context, format, ValueSemanticsAbstract.FormatUsageFor.RENDERING);
  
          // then
          Assertions.assertThat(format.getMaximumFractionDigits()).isEqualTo(maxScale);
          Assertions.assertThat(format.getMinimumFractionDigits()).isEqualTo(minScale);
      }
  
      @Test
      void min_facets_not_set_but_fallback() {
  
          int maxScale = 10;
          int fallbackScale = 3;
  
          // expecting
          Mockito.lenient().when(mockObjectFeature.lookupFacet(MaxFractionalDigitsFacet.class))
                  .thenReturn(Optional.of(new MaxFractionalDigitsFacetAbstract(maxScale, mockObjectFeature) {}));
          Mockito.lenient().when(mockObjectFeature.lookupFacet(MinFractionalDigitsFacet.class))
                 .thenReturn(Optional.empty());
  
          causewayConfiguration.getValueTypes().getBigDecimal().setMinScale(fallbackScale);
  
          // when
          DecimalFormat format = new DecimalFormat();
          valueSemantics.configureDecimalFormat(context, format, ValueSemanticsAbstract.FormatUsageFor.RENDERING);
  
          // then
          Assertions.assertThat(format.getMaximumFractionDigits()).isEqualTo(maxScale);
          Assertions.assertThat(format.getMinimumFractionDigits()).isEqualTo(fallbackScale);
      }
  
      @Test
      void min_facets_not_set_and_no_fallback() {
  
          int maxScale = 10;
          int defaultScale = 0;
  
          // expecting
          Mockito.lenient().when(mockObjectFeature.lookupFacet(MaxFractionalDigitsFacet.class))
                  .thenReturn(Optional.of(new MaxFractionalDigitsFacetAbstract(maxScale, mockObjectFeature) {}));
          Mockito.lenient().when(mockObjectFeature.lookupFacet(MinFractionalDigitsFacet.class))
                 .thenReturn(Optional.empty());
  
          causewayConfiguration.getValueTypes().getBigDecimal().setMinScale(null);
  
          // when
          DecimalFormat format = new DecimalFormat();
          valueSemantics.configureDecimalFormat(context, format, ValueSemanticsAbstract.FormatUsageFor.RENDERING);
  
          // then
          Assertions.assertThat(format.getMaximumFractionDigits()).isEqualTo(maxScale);
          Assertions.assertThat(format.getMinimumFractionDigits()).isEqualTo(defaultScale);
      }
  
  }
  