/*
    *    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.ArrayList;
  import java.util.Collections;
  import java.util.List;
  import java.util.Objects;
  
  import org.jspecify.annotations.Nullable;
  
  public class BatchInsert<T> {
      private final String insertStatement;
      private final List<T> records;
  
      private BatchInsert(Builder<T> builder) {
          insertStatement = Objects.requireNonNull(builder.insertStatement);
          records = Collections.unmodifiableList(Objects.requireNonNull(builder.records));
      }
  
      /**
       * Returns a list of InsertStatement objects. This is useful for MyBatis batch support.
       *
       * @return a List of InsertStatements
       */
      public List<InsertStatementProvider<T>> insertStatements() {
          return records.stream()
                  .map(this::toInsertStatement)
                  .toList();
      }
  
      private InsertStatementProvider<T> toInsertStatement(T row) {
          return DefaultInsertStatementProvider.withRow(row)
                  .withInsertStatement(insertStatement)
                  .build();
      }
  
      /**
       * Returns the generated SQL for this batch. This is useful for Spring JDBC batch support.
       *
       * @return the generated INSERT statement
       */
      public String getInsertStatementSQL() {
          return insertStatement;
      }
  
      public List<T> getRecords() {
          return records;
      }
  
      public static <T> Builder<T> withRecords(List<T> records) {
          return new Builder<T>().withRecords(records);
      }
  
      public static class Builder<T> {
          private @Nullable String insertStatement;
          private final List<T> records = new ArrayList<>();
  
          public Builder<T> withInsertStatement(String insertStatement) {
              this.insertStatement = insertStatement;
              return this;
          }
  
          public Builder<T> withRecords(List<T> records) {
              this.records.addAll(records);
              return this;
          }
  
          public BatchInsert<T> build() {
              return new BatchInsert<>(this);
          }
      }
  }