content: /*
   *  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.causeway.core.metamodel.valuesemantics;
  
  import java.util.List;
  import java.util.Objects;
  import java.util.function.UnaryOperator;
  import java.util.stream.Collectors;
  
  import jakarta.annotation.Priority;
  import jakarta.inject.Named;
  
  import org.springframework.stereotype.Component;
  
  import org.apache.causeway.applib.annotation.PriorityPrecedence;
  import org.apache.causeway.applib.exceptions.recoverable.InvalidEntryException;
  import org.apache.causeway.applib.services.bookmark.IdStringifier;
  import org.apache.causeway.applib.value.semantics.DefaultsProvider;
  import org.apache.causeway.applib.value.semantics.Parser;
  import org.apache.causeway.applib.value.semantics.Renderer;
  import org.apache.causeway.applib.value.semantics.ValueDecomposition;
  import org.apache.causeway.applib.value.semantics.ValueSemanticsAbstract;
  import org.apache.causeway.commons.collections.Can;
  import org.apache.causeway.commons.internal.base._Strings;
  import org.apache.causeway.schema.common.v2.ValueDto;
  import org.apache.causeway.schema.common.v2.ValueType;
  
  import org.jspecify.annotations.NonNull;
  
  /**
   * due to auto-boxing also handles the primitive variant
   */
  @Component
  @Named("causeway.metamodel.value.CharacterValueSemantics")
  @Priority(PriorityPrecedence.LATE)
  public class CharacterValueSemantics
  extends ValueSemanticsAbstract<Character>
  implements
      DefaultsProvider<Character>,
      Parser<Character>,
      Renderer<Character>,
      IdStringifier.EntityAgnostic<Character> {
  
      @Override
      public Class<Character> getCorrespondingClass() {
          return Character.class;
      }
  
      @Override
      public ValueType getSchemaValueType() {
          return ValueType.CHAR;
      }
  
      @Override
      public Character getDefaultValue() {
          return (char) 0;
      }
  
      // -- COMPOSER
  
      @Override
      public ValueDecomposition decompose(final Character value) {
          return decomposeAsNullable(value, UnaryOperator.identity(), ()->null);
      }
  
      @Override
      public Character compose(final ValueDecomposition decomposition) {
          return composeFromNullable(
                  decomposition, ValueDto::getChar, this::fromString, ()->null);
      }
  
      private Character fromString(final String data) {
          return data!=null
                  && data.length()>0
                  ? Character.valueOf(data.charAt(0))
                  : null;
      }
  
      // -- ID STRINGIFIER
  
      static final List<Character> NON_SAFE_URL_CHARS = StringValueSemantics.NON_SAFE_URL_CHARS
              .stream()
              .map(x -> x.charAt(0))
              .collect(Collectors.toList());
      static final String REGULAR_PREFIX = "c" + IdStringifier.SEPARATOR;
      static final String BASE64_PREFIX = "cbse64" + IdStringifier.SEPARATOR;
  
      @Override
      public String enstring(final @NonNull Character id) {
          if(NON_SAFE_URL_CHARS.stream().anyMatch(x -> Objects.equals(x, id))) {
              return BASE64_PREFIX + _Strings.base64UrlEncode(""+id);
          }
          return REGULAR_PREFIX + id;
      }
  
      @Override
      public Character destring(final @NonNull String stringified) {
          if(stringified.startsWith(REGULAR_PREFIX)) {
              return stringified.substring(REGULAR_PREFIX.length()).charAt(0);
          }
          if(stringified.startsWith(BASE64_PREFIX)) {
              return _Strings.base64UrlDecode(stringified.substring(BASE64_PREFIX.length())).charAt(0);
          }
          throw new IllegalArgumentException("Could not parse '" + stringified + "'");
      }
  
      // -- RENDERER
  
      @Override
      public String titlePresentation(final Context context, final Character value) {
          return renderTitle(value, c->""+c);
      }
  
      @Override
      public String htmlPresentation(final Context context, final Character value) {
          return renderHtml(value, c->""+c);
      }
  
      // -- PARSER
  
      @Override
      public String parseableTextRepresentation(final Context context, final Character value) {
          return value == null ? "" : value.toString();
      }
  
      @Override
      public Character parseTextRepresentation(final Context context, final String text) {
          var input = _Strings.blankToNullOrTrim(text);
          if(input==null) {
              return null;
          }
          if (input.length() > 1) {
              throw new InvalidEntryException("Only a single character is required");
          } else {
              return Character.valueOf(input.charAt(0));
          }
      }
  
      @Override
      public int typicalLength() {
          return 1;
      }
  
      @Override
      public int maxLength() {
          return 1;
      }
  
      @Override
      public Can<Character> getExamples() {
          return Can.of('a', 'b');
      }
  
  }
  