/*
    *    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.insert.render;
  
  import java.util.Objects;
  import java.util.Optional;
  
  import org.jspecify.annotations.Nullable;
  import org.mybatis.dynamic.sql.render.RenderedParameterInfo;
  import org.mybatis.dynamic.sql.render.RenderingContext;
  import org.mybatis.dynamic.sql.util.AbstractColumnMapping;
  import org.mybatis.dynamic.sql.util.ConstantMapping;
  import org.mybatis.dynamic.sql.util.GeneralInsertMappingVisitor;
  import org.mybatis.dynamic.sql.util.NullMapping;
  import org.mybatis.dynamic.sql.util.StringConstantMapping;
  import org.mybatis.dynamic.sql.util.StringUtilities;
  import org.mybatis.dynamic.sql.util.ValueMapping;
  import org.mybatis.dynamic.sql.util.ValueOrNullMapping;
  import org.mybatis.dynamic.sql.util.ValueWhenPresentMapping;
  
  public class GeneralInsertValuePhraseVisitor extends GeneralInsertMappingVisitor<Optional<FieldAndValueAndParameters>> {
  
      private final RenderingContext renderingContext;
  
      public GeneralInsertValuePhraseVisitor(RenderingContext renderingContext) {
          this.renderingContext = Objects.requireNonNull(renderingContext);
      }
  
      @Override
      public Optional<FieldAndValueAndParameters> visit(NullMapping mapping) {
          return buildNullFragment(mapping);
      }
  
      @Override
      public Optional<FieldAndValueAndParameters> visit(ConstantMapping mapping) {
          return FieldAndValueAndParameters.withFieldName(mapping.columnName())
                  .withValuePhrase(mapping.constant())
                  .buildOptional();
      }
  
      @Override
      public Optional<FieldAndValueAndParameters> visit(StringConstantMapping mapping) {
          return FieldAndValueAndParameters.withFieldName(mapping.columnName())
                  .withValuePhrase(StringUtilities.formatConstantForSQL(mapping.constant()))
                  .buildOptional();
      }
  
      @Override
      public <T> Optional<FieldAndValueAndParameters> visit(ValueMapping<T> mapping) {
          return buildValueFragment(mapping, mapping.value());
      }
  
      @Override
      public <T> Optional<FieldAndValueAndParameters> visit(ValueOrNullMapping<T> mapping) {
          return mapping.value().map(v -> buildValueFragment(mapping, v))
                  .orElseGet(() -> buildNullFragment(mapping));
      }
  
      @Override
      public <T> Optional<FieldAndValueAndParameters> visit(ValueWhenPresentMapping<T> mapping) {
          return mapping.value().flatMap(v -> buildValueFragment(mapping, v));
      }
  
      private Optional<FieldAndValueAndParameters> buildValueFragment(AbstractColumnMapping mapping,
              @Nullable Object value) {
          return buildFragment(mapping, value);
      }
  
      private Optional<FieldAndValueAndParameters> buildNullFragment(AbstractColumnMapping mapping) {
          return FieldAndValueAndParameters.withFieldName(mapping.columnName())
                  .withValuePhrase("null") //$NON-NLS-1$
                  .buildOptional();
      }
  
      private Optional<FieldAndValueAndParameters> buildFragment(AbstractColumnMapping mapping, @Nullable Object value) {
          RenderedParameterInfo parameterInfo = renderingContext.calculateParameterInfo(mapping.column());
  
          return FieldAndValueAndParameters.withFieldName(mapping.columnName())
                  .withValuePhrase(parameterInfo.renderedPlaceHolder())
                  .withParameter(parameterInfo.parameterMapKey(), value)
                  .buildOptional();
      }
  }