/*
    *    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 org.mybatis.dynamic.sql;
  
  import java.util.Collection;
  import java.util.Objects;
  import java.util.function.Function;
  import java.util.function.Predicate;
  import java.util.function.Supplier;
  import java.util.stream.Collectors;
  import java.util.stream.Stream;
  
  import org.jspecify.annotations.NonNull;
  import org.mybatis.dynamic.sql.render.RenderedParameterInfo;
  import org.mybatis.dynamic.sql.render.RenderingContext;
  import org.mybatis.dynamic.sql.util.FragmentAndParameters;
  import org.mybatis.dynamic.sql.util.FragmentCollector;
  
  public abstract class AbstractListValueCondition<T> implements RenderableCondition<T> {
      protected final Collection<T> values;
  
      protected AbstractListValueCondition(Collection<T> values) {
          this.values = Objects.requireNonNull(values);
      }
  
      public final Stream<T> values() {
          return values.stream();
      }
  
      @Override
      public boolean isEmpty() {
          return values.isEmpty();
      }
  
      private <R> Collection<R> applyMapper(Function<? super T, ? extends R> mapper) {
          Objects.requireNonNull(mapper);
          return values().map(mapper).collect(Collectors.toList());
      }
  
      private Collection<T> applyFilter(Predicate<? super T> predicate) {
          Objects.requireNonNull(predicate);
          return values().filter(predicate).toList();
      }
  
      protected <S extends AbstractListValueCondition<T>> S filterSupport(Predicate<? super T> predicate,
              Function<Collection<T>, S> constructor, S self, Supplier<S> emptySupplier) {
          if (isEmpty()) {
              return self;
          } else {
              Collection<T> filtered = applyFilter(predicate);
              return filtered.isEmpty() ? emptySupplier.get() : constructor.apply(filtered);
          }
      }
  
      protected <R, S extends AbstractListValueCondition<R>> S mapSupport(Function<? super T, ? extends R> mapper,
              Function<Collection<R>, S> constructor, Supplier<S> emptySupplier) {
          if (isEmpty()) {
              return emptySupplier.get();
          } else {
              return constructor.apply(applyMapper(mapper));
          }
      }
  
      public abstract String operator();
  
      @Override
      public FragmentAndParameters renderCondition(RenderingContext renderingContext, BindableColumn<T> leftColumn) {
          return values().map(v -> toFragmentAndParameters(v, renderingContext, leftColumn))
                  .collect(FragmentCollector.collect())
                  .toFragmentAndParameters(Collectors.joining(",", //$NON-NLS-1$
                          operator() + " (", ")")); //$NON-NLS-1$ //$NON-NLS-2$
      }
  
      private FragmentAndParameters toFragmentAndParameters(T value, RenderingContext renderingContext,
                                                            BindableColumn<T> leftColumn) {
          RenderedParameterInfo parameterInfo = renderingContext.calculateParameterInfo(leftColumn);
          return FragmentAndParameters.withFragment(parameterInfo.renderedPlaceHolder())
                  .withParameter(parameterInfo.parameterMapKey(), leftColumn.convertParameterType(value))
                  .build();
      }
  
      /**
       * Conditions may implement Filterable to add optionality to rendering.
       *
       * <p>If a condition is Filterable, then a user may add a filter to the usage of the condition that makes a decision
       * whether to render the condition at runtime. Conditions that fail the filter will be dropped from the
      * rendered SQL.
      *
      * <p>Implementations of Filterable may call
      * {@link AbstractListValueCondition#filterSupport(Predicate, Function, AbstractListValueCondition, Supplier)} as
      * a common implementation of the filtering algorithm.
      *
      * @param <T> the Java type related to the database column type
      */
     public interface Filterable<T> {
         /**
          * If renderable and the value matches the predicate, returns this condition. Else returns a condition
          *     that will not render.
          *
          * @param predicate predicate applied to the value, if renderable
          * @return this condition if renderable and the value matches the predicate, otherwise a condition
          *     that will not render.
          */
         AbstractListValueCondition<T> filter(Predicate<? super @NonNull T> predicate);
     }
 
     /**
      * Conditions may implement Mappable to alter condition values or types during rendering.
      *
      * <p>If a condition is Mappable, then a user may add a mapper to the usage of the condition that can alter the
      * values of a condition, or change that datatype.
      *
      * <p>Implementations of Mappable may call
      * {@link AbstractListValueCondition#mapSupport(Function, Function, Supplier)} as
      * a common implementation of the mapping algorithm.
      *
      * @param <T> the Java type related to the database column type
      */
     public interface Mappable<T> {
         /**
          * If renderable, apply the mapping to the value and return a new condition with the new value. Else return a
          * condition that will not render (this).
          *
          * @param mapper a mapping function to apply to the value, if renderable
          * @param <R> type of the new condition
          * @return a new condition with the result of applying the mapper to the value of this condition,
          *     if renderable, otherwise a condition that will not render.
          */
         <R> AbstractListValueCondition<R> map(Function<? super @NonNull T, ? extends R> mapper);
     }
 }