/*
    *    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 static org.mybatis.dynamic.sql.util.StringUtilities.spaceBefore;
  
  import java.util.Objects;
  
  import org.jspecify.annotations.Nullable;
  import org.mybatis.dynamic.sql.insert.MultiRowInsertModel;
  import org.mybatis.dynamic.sql.render.RenderingStrategy;
  
  public class MultiRowInsertRenderer<T> {
  
      private final MultiRowInsertModel<T> model;
      private final MultiRowValuePhraseVisitor visitor;
  
      private MultiRowInsertRenderer(Builder<T> builder) {
          model = Objects.requireNonNull(builder.model);
          // the prefix is a generic format that will be resolved below with String.format(...)
          visitor = new MultiRowValuePhraseVisitor(Objects.requireNonNull(builder.renderingStrategy),
                  "records[%s]"); //$NON-NLS-1$
      }
  
      public MultiRowInsertStatementProvider<T> render() {
          FieldAndValueCollector collector = model.columnMappings()
                  .map(m -> m.accept(visitor))
                  .collect(FieldAndValueCollector.collect());
  
          String insertStatement = calculateInsertStatement(collector);
  
          return new DefaultMultiRowInsertStatementProvider.Builder<T>().withRecords(model.records())
                  .withInsertStatement(insertStatement)
                  .build();
      }
  
      private String calculateInsertStatement(FieldAndValueCollector collector) {
          String statementStart = InsertRenderingUtilities.calculateInsertStatementStart(model.table());
          String columnsPhrase = collector.columnsPhrase();
          String valuesPhrase = collector.multiRowInsertValuesPhrase(model.recordCount());
  
          return statementStart + spaceBefore(columnsPhrase) + spaceBefore(valuesPhrase);
      }
  
      public static <T> Builder<T> withMultiRowInsertModel(MultiRowInsertModel<T> model) {
          return new Builder<T>().withMultiRowInsertModel(model);
      }
  
      public static class Builder<T> {
          private @Nullable MultiRowInsertModel<T> model;
          private @Nullable RenderingStrategy renderingStrategy;
  
          public Builder<T> withMultiRowInsertModel(MultiRowInsertModel<T> model) {
              this.model = model;
              return this;
          }
  
          public Builder<T> withRenderingStrategy(RenderingStrategy renderingStrategy) {
              this.renderingStrategy = renderingStrategy;
              return this;
          }
  
          public MultiRowInsertRenderer<T> build() {
              return new MultiRowInsertRenderer<>(this);
          }
      }
  }