/*
    *    Copyright 2016-2025 the original author or authors.
    *
    *    Licensed 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
    *
    *       https://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 examples.mysql;
  
  import java.util.NoSuchElementException;
  import java.util.function.Function;
  import java.util.function.Predicate;
  
  import org.jspecify.annotations.Nullable;
  import org.mybatis.dynamic.sql.AbstractSingleValueCondition;
  import org.mybatis.dynamic.sql.BindableColumn;
  import org.mybatis.dynamic.sql.render.RenderingContext;
  import org.mybatis.dynamic.sql.util.FragmentAndParameters;
  
  public class IsLikeEscape<T> extends AbstractSingleValueCondition<T>
          implements AbstractSingleValueCondition.Filterable<T>, AbstractSingleValueCondition.Mappable<T> {
      private static final IsLikeEscape<?> EMPTY = new IsLikeEscape<Object>(-1, null) {
          @Override
          public Object value() {
              throw new NoSuchElementException("No value present"); //$NON-NLS-1$
          }
  
          @Override
          public boolean isEmpty() {
              return true;
          }
      };
  
      public static <T> IsLikeEscape<T> empty() {
          @SuppressWarnings("unchecked")
          IsLikeEscape<T> t = (IsLikeEscape<T>) EMPTY;
          return t;
      }
  
      private final @Nullable Character escapeCharacter;
  
      protected IsLikeEscape(T value, @Nullable Character escapeCharacter) {
          super(value);
          this.escapeCharacter = escapeCharacter;
      }
  
      @Override
      public String operator() {
          return "like";
      }
  
      @Override
      public FragmentAndParameters renderCondition(RenderingContext renderingContext, BindableColumn<T> leftColumn) {
          var fragment = super.renderCondition(renderingContext, leftColumn);
          if (escapeCharacter != null) {
              fragment = fragment.mapFragment(this::addEscape);
          }
  
          return fragment;
      }
  
      private String addEscape(String s) {
          return s + " ESCAPE '" + escapeCharacter + "'";
      }
  
      @Override
      public IsLikeEscape<T> filter(Predicate<? super T> predicate) {
          return filterSupport(predicate, IsLikeEscape::empty, this);
      }
  
      @Override
      public <R> IsLikeEscape<R> map(Function<? super T, ? extends R> mapper) {
          return mapSupport(mapper, v -> new IsLikeEscape<>(v, escapeCharacter), IsLikeEscape::empty);
      }
  
      public static <T> IsLikeEscape<T> isLike(T value) {
          return new IsLikeEscape<>(value, null);
      }
  
      public static <T> IsLikeEscape<T> isLike(T value, Character escapeCharacter) {
          return new IsLikeEscape<>(value, escapeCharacter);
      }
  }