/*
    *    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;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Objects;
  import java.util.stream.Stream;
  
  import org.jspecify.annotations.Nullable;
  import org.mybatis.dynamic.sql.render.RenderingStrategy;
  import org.mybatis.dynamic.sql.select.render.MultiSelectRenderer;
  import org.mybatis.dynamic.sql.select.render.SelectStatementProvider;
  import org.mybatis.dynamic.sql.util.Validator;
  
  public class MultiSelectModel extends AbstractSelectModel {
      private final SelectModel initialSelect;
      private final List<UnionQuery> unionQueries;
  
      private MultiSelectModel(Builder builder) {
          super(builder);
          initialSelect = Objects.requireNonNull(builder.initialSelect);
          unionQueries = builder.unionQueries;
          Validator.assertNotEmpty(unionQueries, "ERROR.35"); //$NON-NLS-1$
      }
  
      public SelectModel initialSelect() {
          return initialSelect;
      }
  
      public Stream<UnionQuery> unionQueries() {
          return unionQueries.stream();
      }
  
      public SelectStatementProvider render(RenderingStrategy renderingStrategy) {
          return MultiSelectRenderer.withMultiSelectModel(this)
                  .withRenderingStrategy(renderingStrategy)
                  .build()
                  .render();
      }
  
      public static class Builder extends AbstractBuilder<Builder> {
          private @Nullable SelectModel initialSelect;
          private final List<UnionQuery> unionQueries = new ArrayList<>();
  
          public Builder withInitialSelect(SelectModel initialSelect) {
              this.initialSelect = initialSelect;
              return this;
          }
  
          public Builder withUnionQueries(List<UnionQuery> unionQueries) {
              this.unionQueries.addAll(unionQueries);
              return this;
          }
  
          @Override
          protected Builder getThis() {
              return this;
          }
  
          public MultiSelectModel build() {
              return new MultiSelectModel(this);
          }
      }
  }