/*
    *    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.common;
  
  import static org.mybatis.dynamic.sql.util.StringUtilities.spaceAfter;
  
  import java.util.Objects;
  import java.util.Optional;
  import java.util.stream.Collectors;
  
  import org.jspecify.annotations.Nullable;
  import org.mybatis.dynamic.sql.SqlCriterion;
  import org.mybatis.dynamic.sql.render.RenderingContext;
  import org.mybatis.dynamic.sql.util.FragmentAndParameters;
  import org.mybatis.dynamic.sql.util.FragmentCollector;
  import org.mybatis.dynamic.sql.where.render.CriterionRenderer;
  import org.mybatis.dynamic.sql.where.render.RenderedCriterion;
  
  public abstract class AbstractBooleanExpressionRenderer {
      protected final AbstractBooleanExpressionModel model;
      private final String prefix;
      private final CriterionRenderer criterionRenderer;
      protected final RenderingContext renderingContext;
  
      protected AbstractBooleanExpressionRenderer(String prefix, AbstractBuilder<?> builder) {
          model = Objects.requireNonNull(builder.model);
          this.prefix = Objects.requireNonNull(prefix);
          renderingContext = Objects.requireNonNull(builder.renderingContext);
          criterionRenderer = new CriterionRenderer(renderingContext);
      }
  
      public Optional<FragmentAndParameters> render() {
          return model.initialCriterion()
                  .map(this::renderWithInitialCriterion)
                  .orElseGet(this::renderWithoutInitialCriterion)
                  .map(RenderedCriterion::fragmentAndParameters);
      }
  
      private Optional<RenderedCriterion> renderWithInitialCriterion(SqlCriterion initialCriterion) {
          return criterionRenderer.render(initialCriterion, model.subCriteria(), this::calculateClause);
      }
  
      private Optional<RenderedCriterion> renderWithoutInitialCriterion() {
          return criterionRenderer.render(model.subCriteria(), this::calculateClause);
      }
  
      private String calculateClause(FragmentCollector collector) {
          if (collector.hasMultipleFragments()) {
              return collector.collectFragments(
                      Collectors.joining(" ", spaceAfter(prefix), "")); //$NON-NLS-1$ //$NON-NLS-2$
          } else {
              return collector.firstFragment()
                      .map(this::stripEnclosingParenthesesIfPresent)
                      .map(this::addPrefix)
                      .orElse(""); //$NON-NLS-1$
          }
      }
  
      private String stripEnclosingParenthesesIfPresent(String fragment) {
          // The fragment will have surrounding open/close parentheses if there is more than one rendered condition.
          // Since there is only a single fragment, we don't need these in the final rendered clause
          if (fragment.startsWith("(") && fragment.endsWith(")")) { //$NON-NLS-1$ //$NON-NLS-2$
              return fragment.substring(1, fragment.length() - 1);
          } else {
              return fragment;
          }
      }
  
      private String addPrefix(String fragment) {
          return spaceAfter(prefix) + fragment;
      }
  
      public abstract static class AbstractBuilder<B extends AbstractBuilder<B>> {
          private final AbstractBooleanExpressionModel model;
          private @Nullable RenderingContext renderingContext;
  
          protected AbstractBuilder(AbstractBooleanExpressionModel model) {
              this.model = model;
          }
  
          public B withRenderingContext(RenderingContext renderingContext) {
              this.renderingContext = renderingContext;
              return getThis();
          }
  
          protected abstract B getThis();
     }
 }