/*
    *    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.select.render;
  
  import java.util.Objects;
  import java.util.stream.Collectors;
  
  import org.mybatis.dynamic.sql.BindableColumn;
  import org.mybatis.dynamic.sql.RenderableCondition;
  import org.mybatis.dynamic.sql.render.RenderedParameterInfo;
  import org.mybatis.dynamic.sql.render.RenderingContext;
  import org.mybatis.dynamic.sql.select.caseexpression.BasicWhenCondition;
  import org.mybatis.dynamic.sql.select.caseexpression.ConditionBasedWhenCondition;
  import org.mybatis.dynamic.sql.select.caseexpression.SimpleCaseWhenConditionVisitor;
  import org.mybatis.dynamic.sql.util.FragmentAndParameters;
  import org.mybatis.dynamic.sql.util.FragmentCollector;
  import org.mybatis.dynamic.sql.util.Validator;
  
  public class SimpleCaseWhenConditionRenderer<T> implements SimpleCaseWhenConditionVisitor<T, FragmentAndParameters> {
      private final RenderingContext renderingContext;
      private final BindableColumn<T> column;
  
      public SimpleCaseWhenConditionRenderer(RenderingContext renderingContext, BindableColumn<T> column) {
          this.renderingContext = Objects.requireNonNull(renderingContext);
          this.column = Objects.requireNonNull(column);
      }
  
      @Override
      public FragmentAndParameters visit(ConditionBasedWhenCondition<T> whenCondition) {
          FragmentCollector fragmentCollector = whenCondition.conditions()
                  .filter(this::shouldRender)
                  .map(this::renderCondition)
                  .collect(FragmentCollector.collect());
  
          Validator.assertFalse(fragmentCollector.isEmpty(), "ERROR.39"); //$NON-NLS-1$
  
          return fragmentCollector.toFragmentAndParameters(Collectors.joining(", ")); //$NON-NLS-1$
      }
  
      @Override
      public FragmentAndParameters visit(BasicWhenCondition<T> whenCondition) {
          return whenCondition.conditions().map(this::renderBasicValue)
                  .collect(FragmentCollector.collect())
                  .toFragmentAndParameters(Collectors.joining(", ")); //$NON-NLS-1$
      }
  
      private boolean shouldRender(RenderableCondition<T> condition) {
          return condition.shouldRender(renderingContext);
      }
  
      private FragmentAndParameters renderCondition(RenderableCondition<T> condition) {
          return condition.renderCondition(renderingContext, column);
      }
  
      private FragmentAndParameters renderBasicValue(T value) {
          RenderedParameterInfo rpi = renderingContext.calculateParameterInfo(column);
          return FragmentAndParameters.withFragment(rpi.renderedPlaceHolder())
                  .withParameter(rpi.parameterMapKey(), value)
                  .build();
      }
  }