/*
    *    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 static org.mybatis.dynamic.sql.util.StringUtilities.spaceBefore;
  
  import java.util.function.BiFunction;
  import java.util.function.BiPredicate;
  import java.util.function.Function;
  import java.util.function.Predicate;
  import java.util.function.Supplier;
  
  import org.mybatis.dynamic.sql.render.RenderedParameterInfo;
  import org.mybatis.dynamic.sql.render.RenderingContext;
  import org.mybatis.dynamic.sql.util.FragmentAndParameters;
  
  public abstract class AbstractTwoValueCondition<T> implements RenderableCondition<T> {
      protected final T value1;
      protected final T value2;
  
      protected AbstractTwoValueCondition(T value1, T value2) {
          this.value1 = value1;
          this.value2 = value2;
      }
  
      public T value1() {
          return value1;
      }
  
      public T value2() {
          return value2;
      }
  
      protected <S extends AbstractTwoValueCondition<T>> S filterSupport(BiPredicate<? super T, ? super T> predicate,
              Supplier<S> emptySupplier, S self) {
          if (isEmpty()) {
              return self;
          } else {
              return predicate.test(value1, value2) ? self : emptySupplier.get();
          }
      }
  
      protected <S extends AbstractTwoValueCondition<T>> S filterSupport(Predicate<? super T> predicate,
              Supplier<S> emptySupplier, S self) {
          return filterSupport((v1, v2) -> predicate.test(v1) && predicate.test(v2), emptySupplier, self);
      }
  
      protected <R, S extends AbstractTwoValueCondition<R>> S mapSupport(Function<? super T, ? extends R> mapper1,
              Function<? super T, ? extends R> mapper2, BiFunction<R, R, S> constructor, Supplier<S> emptySupplier) {
          if (isEmpty()) {
              return emptySupplier.get();
          } else {
              return constructor.apply(mapper1.apply(value1), mapper2.apply(value2));
          }
      }
  
      public abstract String operator1();
  
      public abstract String operator2();
  
      @Override
      public FragmentAndParameters renderCondition(RenderingContext renderingContext, BindableColumn<T> leftColumn) {
          RenderedParameterInfo parameterInfo1 = renderingContext.calculateParameterInfo(leftColumn);
          RenderedParameterInfo parameterInfo2 = renderingContext.calculateParameterInfo(leftColumn);
  
          String finalFragment = operator1()
                  + spaceBefore(parameterInfo1.renderedPlaceHolder())
                  + spaceBefore(operator2())
                  + spaceBefore(parameterInfo2.renderedPlaceHolder());
  
          return FragmentAndParameters.withFragment(finalFragment)
                  .withParameter(parameterInfo1.parameterMapKey(), leftColumn.convertParameterType(value1()))
                  .withParameter(parameterInfo2.parameterMapKey(), leftColumn.convertParameterType(value2()))
                  .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 AbstractTwoValueCondition#filterSupport(Predicate, Supplier, AbstractTwoValueCondition)}
       * or {@link AbstractTwoValueCondition#filterSupport(BiPredicate, Supplier, AbstractTwoValueCondition)} 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 values match the predicate, returns this condition. Else returns a condition
          *     that will not render.
          *
          * @param predicate predicate applied to the values, if renderable
          * @return this condition if renderable and the values match the predicate, otherwise a condition
          *     that will not render.
          */
         AbstractTwoValueCondition<T> filter(BiPredicate<? super T, ? super T> predicate);
 
         /**
          * If renderable and both values match the predicate, returns this condition. Else returns a condition
          *     that will not render. This function implements a short-circuiting test. If the
          *     first value does not match the predicate, then the second value will not be tested.
          *
          * @param predicate predicate applied to both values, if renderable
          * @return this condition if renderable and the values match the predicate, otherwise a condition
          *     that will not render.
          */
         AbstractTwoValueCondition<T> filter(Predicate<? super 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 AbstractTwoValueCondition#mapSupport(Function, Function, BiFunction, 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 mappings to the values and return a new condition with the new values. Else return a
          * condition that will not render (this).
          *
          * @param mapper1 a mapping function to apply to the first value, if renderable
          * @param mapper2 a mapping function to apply to the second value, if renderable
          * @param <R> type of the new condition
          * @return a new condition with the result of applying the mappers to the values of this condition,
          *     if renderable, otherwise a condition that will not render.
          */
         <R> AbstractTwoValueCondition<R> map(Function<? super T, ? extends R> mapper1,
                                              Function<? super T, ? extends R> mapper2);
 
         /**
          * If renderable, apply the mapping to both values and return a new condition with the new values. Else return a
          *     condition that will not render (this).
          *
          * @param mapper a mapping function to apply to both values, if renderable
          * @param <R> type of the new condition
          * @return a new condition with the result of applying the mappers to the values of this condition,
          *     if renderable, otherwise a condition that will not render.
          */
         <R> AbstractTwoValueCondition<R> map(Function<? super T, ? extends R> mapper);
     }
 }